JP2021059063A - Laminate for resealable sealing material, resealable sealing material, container with resealable sealing material, and package - Google Patents

Abstract

To provide a laminate used for a sealing material for heat fusion-bonding a container capable of housing an ingredient such as a food product with a lid material which realizes hermetic property, easy unsealing property, and resealability of an obtained package.SOLUTION: A laminate 1 includes: a first heat fusion-bondable resin layer 1a capable of heat fusion-bonding with an under face of a lid material; a second heat fusion-bondable resin layer 1c capable of heat fusion-bonding with a flange part upper face of a container; and an adhesive layer 1b for resealing for bonding the first heat fusion-bondable resin layer 1a with the second heat fusion-bondable resin layer 1a. Releasing of the first heat fusion-bondable resin layer 1a from the second heat fusion bondable resin layer 1c is possible by interfacial failure of one or the other face of the adhesive layer 1b for resealing, or cohesion failure of the adhesive layer 1b for resealing.SELECTED DRAWING: Figure 1

Description

The present invention is a laminate used as a material for a resealable sealing material that not only can seal a container containing contents such as foods and pharmaceuticals with a lid material but also enables easy opening and resealing. The present invention relates to the resealable seal material used, a container provided with the resealable seal material, and a package using the container.

Conventionally, many packages have been developed for sealing and preserving easily denatured products such as foods, pharmaceuticals, chemical products, and some industrial parts so as not to be mixed with foreign substances such as dust and bacteria. For example, gas and moisture have been developed. , A packaging body in which a lid material is heat-sealed to a flange portion of a cup-shaped container formed by drawing and molding a composite sheet in which a synthetic resin film is laminated on a metal foil layer having excellent barrier properties such as light is known.

By the way, the product sealed and stored in the package may not be completely consumed after opening, and may be transferred to another container to avoid deterioration. However, powdered products may be scattered around, and liquid products may spill or remain in the original packaging to a considerable extent. Therefore, there is a demand in the field for a packaging container that can be sealed with a lid material, can be easily opened, and has a resealability (resealability) that allows the container to be resealed with a lid material after opening, for example. It is disclosed in Patent Documents 1 and 2.

Patent Document 1 describes a resealable packaging container including a lid material and a main body having a flange portion and a housing portion. Further, the lid material is composed of a laminated sheet of a surface resin layer, an adhesive resin layer and a sealing resin layer, while the main body is composed of a laminated sheet of a sealing resin layer and a surface resin layer, and the lower surface of the flange portion. Is provided with a half-cut portion. When the half-cut portion is used as a folding portion to open the seal, the sealing resin layer on the lower surface of the lid material is divided and left on the upper surface of the flange portion, and as a result, an adhesive resin layer appears on the lower surface of the lid material (in the document). (See FIG. 5), resealing is performed using this adhesive resin layer.

Patent Document 2 describes an easily openable sealed container in which a multi-layer lid material with a grip portion composed of an outer layer, an adhesive layer, and an inner layer is heat-sealed to a container flange portion so that the inner layer is on the lower surface. .. This container also has a half-cut portion on the lower surface of the flange portion, and when opened, the adhesive layer and the heat seal layer on the lower surface of the lid material and the heat seal layer on the upper surface of the flange portion are integrally separated. , The pressure-sensitive adhesive layer appears on the upper surface of the flange portion (see FIG. 4 of the document), and resealing is performed using this pressure-sensitive adhesive layer (see FIG. 5).

Japanese Unexamined Patent Publication No. 1-189269 Japanese Unexamined Patent Publication No. 2018-115015

By the way, in both of the resealing mechanisms of Patent Documents 1 and 2, the thermosetting resin layer on the lower surface of the lid material is broken at the time of opening, and the thermosetting resin is formed into a thread-like or film-like fragment at that time. As a result, it may remain on the lid material or the sealing part of the container flange, or may be mixed in the container.

The present invention is a laminate used as a sealing material for heat-sealing a lid material to a flange portion of a container which is a main body of a packaging body for accommodating contents such as food, and the sealing property of the packaging body is easy. It is an object of the present invention to provide a novel laminate which can realize openability and resealability and does not cause the problem of the filamentous or membranous fragment at the time of opening.

Further, in the present invention, a resealable seal material using the laminate, a container in which the resealable seal material is heat-sealed to a flange portion, and a lid material after containing contents such as food in the container. It is also an issue to provide a heat-sealed package.

As a result of the study, the present inventor has found that the above problems can be solved by the following laminate, resealable sealant, container with resealable sealant and package, and has completed the present invention. That is, the present invention comprises the following aspects.

1) Intervene between the upper surface of the flange portion formed on the peripheral edge of the opening of the container capable of accommodating the contents and the lower surface of the lid material joined to the upper surface of the flange portion so as to close the opening of the container. A laminate used as a material for a resealable sealing material that heat-seals these surfaces so that they can be resealed.
A first thermosetting resin layer that can be heat-sealed with the lower surface of the lid material,
A second thermosetting resin layer that can be heat-sealed with the upper surface of the flange portion,
A resealing pressure-sensitive adhesive layer for joining the first thermosetting resin layer and the second thermosetting resin layer,
Is equipped with
The peeling of the first thermosetting resin layer and the second thermosetting resin layer causes interfacial destruction on one surface or the other surface of the resealing pressure-sensitive adhesive layer or the resealing pressure-sensitive adhesive. It is characterized by being made possible by cohesive failure of layers,
Laminated body.

2) The laminate for a resealable sealing material according to 1 above, wherein the resealable adhesive layer contains a filler.

3) The laminate for a resealable sealing material according to 1) or 2), wherein the average primary particle size of the filler is 1 to 50 μm.

4) Reseal these surfaces by interposing between the upper surface of the flange portion formed on the peripheral edge of the opening of the container and the lower surface of the lid material joined to the upper surface of the flange portion so as to close the opening of the container. A resealable sealing material that can be heat-sealed as much as possible.
It is formed from the laminate of any of the above 1) to 3), and has an opening having the same or similar shape as the opening peripheral edge of the container inside.
Resealable sealing material.

5) A container with a resealable sealant, comprising a container having a flange on the peripheral edge of the opening and capable of accommodating the contents, and the resealable sealant of 4) above, which is heat-sealed to the upper surface of the flange.

6) The upper surface of the flange portion of the container is made of a heat-sealing resin, and the heat-sealing resin and the second heat-sealing resin layer of the resealable sealing material are the same or the same type. 5) The container with the resealable sealing material, which is the material of the above.

7) The inner edge of the container-side heat-sealing portion formed by heat-sealing a second heat-sealing resin layer of the resealing sealing material on the upper surface of the flange portion of the container is the resealing. The container with the resealable sealant according to 5) or 6) above, which is located at least 1 mm outside the inner edge of the sex sealant.

8) A package containing the contents, which is formed by joining a lid material to the upper surface of the flange portion so as to close the opening of the container having the flange portion on the peripheral edge of the opening.
The lower surface of the lid material and the upper surface of the flange portion are heat-sealed so as to be resealable by the resealable sealing material of 4) interposed between these surfaces.
Packaging body.

9) The lower surface of the lid material is made of a thermosetting resin, and the heat-sealing resin and the first heat-sealing resin layer of the resealing sealing material are the same or the same type. The package of 8) above, which is a material.

10) The upper surface of the flange portion of the container is made of a thermosetting resin, and the thermosetting resin and the second thermosetting resin layer of the resealable sealing material are the same or The package of 8) or 9), which is the same type of material.

11) The inner edge of the lid material side heat-sealing portion formed between the lower surface of the lid material and the first thermosetting resin layer of the resealable sealing material.
And / or
The inner edge of the container-side heat-sealing portion formed between the upper surface of the flange portion of the container and the second thermosetting resin layer of the resealing sealing material is formed.
It is located at least 1 mm outside the inner edge of the resealable sealant.
The package according to any one of 8) to 10) above.

The laminate of 1) includes a first thermosetting resin layer, a resealing pressure-sensitive adhesive layer, and a second heat-sealing resin layer, and is used as a material for a resealing sealing material. The resealable sealing material is interposed between the upper surface of the flange portion formed on the peripheral edge of the opening of a predetermined container and the lower surface of the lid material joined to the upper surface of the flange portion so as to close the opening of the container. It is a member that heat-seals these surfaces so that they can be resealed.
Further, the laminate is formed with the first thermosetting resin layer and the second by the interfacial destruction on one surface or the other surface of the resealing pressure-sensitive adhesive layer or the cohesive destruction of the resealing pressure-sensitive adhesive layer. It is characterized in that the thermosetting resin layer can be peeled off. Therefore, the package body heat-sealed via the resealable sealing material made of the laminated body can be easily opened.
Further, since the laminated body is peeled off at the predetermined resealing pressure-sensitive adhesive layer as described above, the first thermosetting resin layer and / or the second thermosetting resin layer is broken. Absent. Therefore, the above-mentioned problem of filamentous or membranous fragments, which is assumed in the opening mechanism of Patent Documents 1 and 2, is unlikely to occur.
Further, in the laminated body, the pressure-sensitive adhesive layer for resealing is exposed by the peeling of the first thermosetting resin layer and the second thermosetting resin layer, so that the resealing seal made of the laminated body is formed. The package that has been heat-sealed with the material can be resealed.

The laminate of 2) has good heat resistance because the adhesive layer for resealing contains a filler. In particular, in the laminate of 3), since the average primary particle size of the filler is limited, the adhesive strength of the resealing adhesive layer is not significantly impaired, and the adhesive from the end face of the laminate during heat fusion is not significantly impaired. Exudation is suppressed.

The resealable sealing material of 4) is a member that heat-seals the lid material and the container flange portion, and has an opening of the same shape or a similar shape as the opening peripheral edge of the container on the inside (continuous surface) thereof, and therefore is resealed. It becomes easy to manufacture containers and packages with sex sealant.

The container with the resealable seal material of 5) is a container in which the resealable seal material of 4) is heat-sealed on the upper surface of the flange portion of the container capable of accommodating the contents. In particular, as in 6) the container with the resealable sealing material, the upper surface of the flange portion of the container is made of a heat-sealing resin, and the heat-sealing resin and the second resealing sealing material are used. By using the same or the same type of material as the heat-sealing resin layer, a very tight seal can be realized. In addition, this configuration is effective in inducing peeling in the vicinity of the resealing adhesive layer.

Further, in the containers with the resealable seal material of 5) and 6), the resealable seal material is provided in advance on the flange portion thereof, so that when the contents are sealed, the contents are contained in the resealable seal material. It does not adhere or impurities do not enter between the flange of the container and the resealing sealing material, and the sealing strength does not decrease due to these.

The container with the resealable seal material of 7) is formed in the container with the resealable seal material of 5) or 6), and the upper surface of the flange portion of the container and the second heat fusion of the resealable seal material are fused. The inner edge of the heat-sealing portion (container-side heat-sealing portion) between the sex resin layer and the heat-sealing portion is located at least 1 mm outside the inner edge of the resealable sealing material. In other words, an unsealed portion having a width of at least 1 mm is previously formed adjacent to the container opening side of the container-side heat-sealing portion having a high sealing strength.

Further, according to the above-mentioned characteristic configuration, the container with the resealable sealing material in 7) is also heat-sealed with a lid material (that is, the packaging body of 11), and the container opening side is at least 1 mm unsealed. The part will remain. In such a package, even if the internal pressure rises or an impact is applied from the outside, the pressure can be guided to the heat-sealed portion on the container side having high sealing strength, so that the package can be peeled off from the inside. It is less likely to occur.

Further, in the package obtained by using the container with the resealable sealing material of 7), the lid material is completely peeled off in order to make the consumer feel the peeling resistance (catch) at the final stage of opening due to the above-mentioned characteristic configuration. It can be suppressed. Further, since the lid material can be connected to the end of the container flange portion, the alignment of the lid material at the time of resealing becomes easy.

The package of 8) is resealed because the lid material is heat-sealed on the upper surface of the flange portion of the container that can accommodate the contents via the resealable sealing material of 4). It is configured to be possible.

In the packaging body of 9), the thermosetting resin constituting the lower surface of the lid material and the first thermosetting resin of the resealable sealing material are made of the same or the same kind of material in the packaging body of 8). To.
Further, in the package of 10), in the package of 8) or 9), the second thermosetting resin layer of the resealable sealing material and the thermosetting resin constituting the upper surface of the container flange portion are the same. Or it is composed of the same kind of material.
Therefore, both the packages 9) and 10) have realized a very reliable tight seal and have good sealing performance. Further, since the tight seal can induce peeling in the adhesive layer for resealing, it is possible to more reliably prevent leakage of the contents and steam leakage when the internal pressure is increased.

The package of 11) is a lid formed between the lower surface of the lid material and the first heat-sealing resin layer of the resealable sealing material in any of the packages of 8), 9) and 10). The inner edge of the material-side heat-sealing portion and / or the container-side heat-sealing formed between the upper surface of the flange portion of the container and the second heat-sealing resin layer of the resealable sealing material. The inner edge of the portion is located at least 1 mm outside the inner edge of the resealable sealant. In other words, an unsealed portion having a width of at least 1 mm is previously formed adjacent to the container opening side of the container-side heat-sealing portion having high sealing strength, which is formed on the upper surface and / or the lower surface of the predetermined resealable sealing material. It is characterized by being. With this characteristic configuration, the package of 11) has the following effects, for example.

First, the package of 11) has improved pressure resistance, durability, and impact resistance when sealed. In this regard, in general, when the contents of the package are fermented foods and processed foods that require boil sterilization and retort sterilization, the internal pressure may increase during storage or heating, and the package may expand. In addition, external pressure or internal pressure may be applied to the lid material or container during transportation or dropping, or the contents may receive a stronger impact than the inside. However, in the packaging body of 11), due to the presence of the unsealed portion, the pressure applied from inside and outside is applied from the resealing adhesive layer having a relatively low sealing strength to the lid material having a relatively high sealing strength. Since it can be guided (dispersed) to the side heat-sealing portion and / or the container-side heat-sealing portion, unintended opening from the inside is less likely to occur.

Further, according to the package of 11), it is possible to prevent the lid material from being completely peeled off at the time of opening. Specifically, for example, the packaging bodies of Patent Documents 1 and 2 have a structure in which the lid material can be easily completely peeled off from the container flange portion. Therefore, when resealing, the separated lid materials are aligned with the flange portion of the container one by one. There is complexity that must be done, and if it is not properly aligned, the contents may leak out. In this respect, since the package of 11) is provided with an unsealed portion of at least 1 mm inside the resealable sealing material (container opening side), the peeling position of the lid material exceeds the container opening and is on the lid material side. The peeling resistance rapidly increases when the heat-sealed portion and / or the inner (container opening side) edge of the container-side heat-sealed portion is reached. Then, the consumer who senses this resistance can stop the opening operation before the lid material is completely peeled off. At this time, since the lid material is connected to the flange portion of the container, if the lid material is re-stacked on the flange after the contents are taken out from the container, resealing can be performed without any special alignment work.

It is sectional drawing of one aspect of the laminated body for a resealable sealing material of this invention, (a) is a basic structure, (b) is a 1st thermosetting resin layer and a 2nd thermosetting resin. In the embodiment (c), the reinforcing layers are provided on the inner surface of the first thermosetting resin layer and the inner surface of the second thermosetting resin layer, respectively. Is shown. It is a perspective view of one aspect of the container with a resealable seal material of this invention. It is a partial cross-sectional view near the flange part of the container with a resealable sealing material. It is a perspective view of one aspect of the package body of this invention. It is a partial cross-sectional view in the vicinity of the flange portion of the same package, and the packages of (a), (b) and (c) are mutually formed by the formation position of the heat-sealed portion on the lid material side and the heat-sealed portion on the container side. The width is different. It is a partial cross-sectional view in the vicinity of the flange portion in which the package body is expanded due to the increase in internal pressure. It is a partial cross-sectional view of the vicinity of the flange portion at the initial stage of opening the package, (a) is peeling due to interfacial fracture on the upper surface of the resealing adhesive layer, and (b) is due to cohesive fracture of the resealing adhesive layer. Peeling, (c) shows peeling due to interfacial fracture on the lower surface of the resealing adhesive layer, respectively. It is a top view which shows the initial state of opening of the package. It is a top view which shows the state of the package body in the latter stage of opening. It is a partial cross-sectional view of the vicinity of the flange part in the late-opening aspect of the package, (a) is the AA'line of FIG. 9, (b) is the BB'line of FIG. 9, and (c) is FIG. Corresponds to each CC'line.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 10.

1. 1. Laminated material for resealable seal material

1-1. Basic configuration

The resealable seal material laminate (1) (hereinafter, also simply referred to as the laminate (1)) is used as a material for the resealable seal material (2). The resealable sealing material (2) is interposed between the upper surface of the flange portion (41) of the container (4) and the lower surface of the lid material (6) joined to the flange portion (41). It is a member that heat-seals the surfaces, and imparts a resealing function to the obtained package (8).

1 (a) to 1 (c) are cross-sectional views of one aspect of the laminated body (1).

The laminate (1) of FIG. 1 (a) includes a first thermosetting resin layer (1a), a resealing adhesive layer (1b), and a second thermosetting resin layer (1c). ..

The first thermosetting resin layer (1a) is a layer capable of heat-sealing with the lower surface (innermost surface) of the lid material (6), and is composed of various known thermoplastic resins (A).

Specific examples of the thermoplastic resin (A) include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), stretched polypropylene (OPP), unstretched polypropylene (CPP), and acid. Examples thereof include modified polypropylene (AMPP), poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin and acrylic copolymer resin.
The thermoplastic resin (A) may be in the form of a film or a sheet, and commercially available products such as the Unilux LS series manufactured by Idemitsu Unitech Co., Ltd., Aroma UT100 and Aroma-ET manufactured by Okamoto Co., Ltd., etc. Aroma-series can be used.
As the thermoplastic resin (A), the strength of the lid material side heat-sealing portion (7) formed between the upper surface of the first thermosetting resin layer (1a) and the lower surface of the lid material (6). In consideration of reliability and reliability, the same or the same type as the constituent material of the lower surface of the lid material (6) is preferable.

One side or both sides of the thermoplastic resin (A) may be subjected to physical or chemical base treatment such as corona treatment, plasma treatment, frame treatment, coating treatment (hereinafter, the same applies to the base treatment). .. By such surface modification, for example, the heat-sealing property between the lower surface of the lid material (6) and the first thermosetting resin layer (1a), or the first thermosetting resin layer (1a) and the reinforcing layer Adhesiveness to (11d), adhesion between the first thermosetting resin layer (1a) or reinforcing layer (11d) and the resealing adhesive layer (1b), resealing adhesive layer (1b) The peelability of the product can be adjusted.

The thickness of the first thermosetting resin layer (1a), that is, the thickness of the thermoplastic resin (A) is not particularly limited, but the heat-sealing property with the lower surface of the lid material (6) and the packaging body (8) ) Is usually 20 μm to 200 μm, preferably 30 μm to 100 μm, in consideration of hermeticity (airtightness), strength, durability, impact resistance, and the like.

The resealing adhesive layer (1b) is a layer for joining the first thermosetting resin layer (1a) and the second thermosetting resin layer (1c), and various known adhesives. It is composed of (B).

Examples of the pressure-sensitive adhesive (B) include natural rubber-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, and (meth) acrylic-based pressure-sensitive adhesive compositions.

Examples of the synthetic rubber-based pressure-sensitive adhesive include chloroprene rubber, styrene-butadiene block copolymer (SB), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene block copolymer (SI), and styrene-. Isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-styrene block copolymer (SEBS), styrene-ethylene-propylene block copolymer (SEP), styrene-isobutylene-styrene block copolymer (SIBS) ), Styrene-butadiene rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene rubber (NBR) and the like.

Examples of the silicone-based pressure-sensitive adhesive include peroxide-curable silicone-based pressure-sensitive adhesives and addition-reaction type silicone-based pressure-sensitive adhesives. Examples of the former include those obtained by polymerizing a precursor composition containing polyorganosiloxane and polyorganosiloxane resin (MQ resin) in the presence of an organic peroxide such as benzoyl peroxide. The latter is a precursor composition containing a polyorganosiloxane having an alkenyl group bonded to a silicon atom and a polyorganosiloxane resin (MQ resin), which is subjected to an addition reaction in the presence of a hydrosilyl group-containing cross-linking agent and a platinum-based curing catalyst. Can be mentioned.

The urethane-based pressure-sensitive adhesive composition includes, for example, a urethane prepolymer and / or a polyisocyanate (excluding those corresponding to the urethane prepolymer; the same shall apply hereinafter), a polyol, and a two-component curable urethane type catalyst. Adhesives can be mentioned. The urethane prepolymer is an isocyanate group-terminated polymer composed of a polyol and a polyisocyanate. Examples of the polyol include high molecular weight polyols such as polyester polyol, polyether polyol, polycarbonate diol and polybutadiene glycol, ethylene glycol, propylene glycol, tetramethylene glycol, cyclohexanedimethanol and 3-methyl-1,5-pentanediol, 1, Examples thereof include low molecular weight polyols such as 6-hexanediol. Examples of the polyisocyanate include xylylene diisocyanate, isophorone diisocyanate and 2,2,4-trimethylhexamethylene diisocyanate. Examples of the catalyst include tin compounds such as dioctyltin dilaurate and dibutyltin dilaurate, and tertiary amine compounds such as triethylamine and triethylenediamine.

As the acrylic pressure-sensitive adhesive composition, various known (meth) acrylic copolymer-based pressure-sensitive adhesive compositions can be used. Examples of the constituent monomers of the (meth) acrylic copolymer include (meth) acrylic acid alkyl ester, (meth) acrylic acid hydroxyalkyl ester, (meth) acrylic acid alkoxyalkyl ester, and alicyclic (meth). Acrylic acid alkyl esters, α, β unsaturated carboxylic acids, aromatic vinyl monomers, (meth) acrylamide and the like can be mentioned. Examples of the (meth) acrylic acid alkyl ester include methyl (meth) acrylic acid, ethyl (meth) acrylic acid, propyl (meth) acrylic acid, butyl (meth) acrylate, hexyl (meth) acrylic acid, and (meth) acrylic acid. Examples thereof include octyl, 2-ethylhexyl (meth) acrylate, decyl (meth) acrylate, and lauryl (meth) acrylate. Examples of the (meth) acrylic acid hydroxyalkyl ester include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate. .. Examples of the (meth) acrylic acid alkoxyalkyl ester include methoxymethyl (meth) acrylic acid and ethoxymethyl (meth) acrylic acid. Examples of the alicyclic (meth) acrylic acid alkyl ester include cyclohexyl (meth) acrylic acid and isobonyl (meth) acrylic acid. Examples of α and β unsaturated carboxylic acids include (meth) acrylic acid and maleic acid. Examples of the aromatic vinyl monomer include styrene and the like.

The (meth) acrylic copolymer can be produced by various known radical polymerization methods (solution polymerization, suspension polymerization, etc.). In addition, various known polymerization initiators, chain transfer agents, and solvents can be used in the production. Examples of the polymerization initiator include azo-based initiators such as 2,2'-azobis (isobutyronitrile) and dimethyl 2,2'-azobis (2-methylpropionate), and various known organic or inorganic substances. A peroxide or redox-type initiator can be exemplified. Examples of the chain transfer agent include mercaptopropionic acid, methyl mercaptopropionate, dodecyl mercaptan and the like. Examples of the solvent include toluene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone and the like. The physical properties of the (meth) acrylic copolymer are not particularly limited, but usually, the number average molecular weight is 50,000 to 80,000, and the glass transition temperature is −50 ° C. to 0 ° C. As the (meth) acrylic copolymer, for example, those described in JP-A-2019-11166, JP-A-2019-94513, and JP-A-2017-194563 can also be used.

The pressure-sensitive adhesive (B) may include a pressure-sensitive adhesive. Specific examples thereof include rosins, polymerized rosins and hydrogenated rosins and esters thereof, and polyterpenes, phenol terpenes, low molecular weight vinyl polymers and the like. Examples of the copolymerizable monomer constituting the low molecular weight vinyl polymer include the monomer constituting the (meth) acrylic copolymer. Specifically, for example, a copolymer consisting of at least two kinds of monomers selected from the group consisting of the above-mentioned (meth) acrylic acid alkyl ester, aromatic vinyl monomer and alicyclic (meth) acrylic acid alkyl ester. A polymer and the like can be exemplified. Further, the low molecular weight vinyl polymer can be produced by various known radical polymerization methods (solution polymerization, suspension polymerization, etc.). In addition, various polymerization initiators, chain transfer agents and solvents can be used in the production. The physical characteristics of the low molecular weight vinyl polymer are not particularly limited, but usually, the number average molecular weight is 1000 to 5000, and the glass transition temperature is 60 ° C. to 160 ° C. As the low molecular weight vinyl polymer, for example, those described in JP-A-2019-111660 can also be used.

The pressure-sensitive adhesive (B) may contain a cross-linking agent. Specific examples thereof include an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, an aziridine-based cross-linking agent, an oxazoline-based cross-linking agent, a metal chelate-based cross-linking agent, a silane coupling agent, and the like. Appropriate ones can be selected according to the type. Examples of the isocyanate-based cross-linking agent include hexamethylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, 2,4-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate and other diisocyanates, and diisocyanate and trimethylolpropane. Examples thereof include an addition reaction product, an isocyanurate form, a burette form, an allophanate form, and an adduct form of the isocyanate. Epoxy-based cross-linking agents include tetraglycidyl xylene diamine, diglycidyl aniline, 1,3-bis (N, N-diglycidyl aminomethyl) cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether and Examples thereof include ethylene glycol diglycidyl ether. Examples of oxazoline-based cross-linking agents include diphenylmethane-4,4'-bis (1-aziridine carboxamide), trimethylolpropane tri-β-aziridinyl propionate and tetramethylolmethanetri-β-aziridinyl propio. Nate and the like can be exemplified. Examples of the oxazoline-based cross-linking agent include polymers containing an oxazoline group-containing monomer such as 2-vinyl-2-oxazoline, 2-isopropenyl-2-oxazoline, and 2-vinyl-4-methyl-2-oxazoline as a polymerization component. Can be exemplified. Examples of the metal chelate-based cross-linking agent include diisopropoxyaluminum monooleyl acetoacetate, monoisopropoxyaluminum bisoleyl acetoacetate, titanium tetra-2-ethylhexanoate, zirconium sec-butyrate, and zirconium diethoxy-tert-butyrate. It can be exemplified. Examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2- (3,4-epoxycyclohexyl) ethyltri. Examples thereof include methoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyldimethoxysilane, and the like.

Physical properties such as the viscosity of the pressure-sensitive adhesive (B) and constants such as the solid concentration are not particularly limited. For example, the viscosity of the E-type viscometer (rotation speed 50 rpm, 25 ° C.) is usually 2000 to 8000 mPa · s, preferably 5000 to 6000 mPa · s (rotation speed 50 rpm) in consideration of handleability, film forming property, and the like. , 25 ° C.).

The resealing pressure-sensitive adhesive layer (1b) may contain various known fillers, for example, in order to improve the heat resistance of the pressure-sensitive adhesive (B). Examples of the filler include inorganic to organic fillers such as silica beads, alumina, glass fiber, glass beads and acrylic beads, and two or more kinds can be used in combination.

The average primary particle size of the filler is not particularly limited, and is usually 1 to 50 μm. Such a filler functions as a cushioning material for the resealing pressure-sensitive adhesive layer (1b) and prevents the pressure-sensitive adhesive (B) from squeezing out or flowing out from the end face of the resealing pressure-sensitive adhesive layer (1b) under heat-sealing pressure. In addition, the adhesive strength of the resealing adhesive layer (1b) at the time of opening is not significantly impaired. On the other hand, considering the effect and the peelability of the first thermosetting resin layer (1a) and / or the second thermosetting resin layer (1c), the upper limit of the average primary particle size is more limited. You may. From the above, the average primary particle size of the filler is preferably 1 to 40 μm, more preferably 1 to 30 μm, particularly preferably 1 to 20 μm, and even more preferably 1 to 10 μm.

The amount of the filler used is also not particularly limited, but is usually 10 to 60 parts by mass, preferably 15 to 40 parts by mass with respect to 100 parts by mass of the total solid content (excluding the filler content) of the pressure-sensitive adhesive (B).

The thickness of the resealing adhesive layer (1b) is not particularly limited, but the strength of the first thermosetting resin layer (1a) and the second thermosetting resin layer (1c), and the resealing adhesive layer. Considering the resealing function of the agent layer (1b), it is usually 0.5 μm to 100 μm, preferably 2 μm to 20 μm.

The second thermosetting resin layer (1c) is a layer capable of heat-sealing with the upper surface of the flange portion (41) of the container (4), and is composed of various known thermoplastic resins (C).

Specific examples of the thermoplastic resin (C) include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), stretched polypropylene (OPP), unstretched polypropylene (CPP), and acid. Examples thereof include modified polypropylene (AMPP), poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin and acrylic copolymer resin.
The thermoplastic resin (C) may be in the form of a film or a sheet, and commercially available products such as the Unilux LS series manufactured by Idemitsu Unitech Co., Ltd., Aroma UT100 and Aroma-ET manufactured by Okamoto Co., Ltd., etc. Aroma-series can be used.
As the thermoplastic resin (C), the container-side thermosetting portion (C) formed between the lower surface of the second thermosetting resin layer (1c) and the upper surface of the flange portion (41) of the container (4). Considering the strength and reliability of 5), it is preferable that the material is the same as or the same as the constituent material of the upper surface of the flange portion (41).

The base treatment may be applied to one side or both sides of the thermoplastic resin (C). By such surface modification, for example, the resealability of the resealing adhesive layer (1b), the resealing adhesive layer (1b) and the reinforcing layer (12), or the second thermosetting resin layer (1c) can be obtained. Adhesion between the reinforcing layer (12d) and the second thermosetting resin layer (1c), the second thermosetting resin layer (1c) and the flange portion (41) of the container (4). The heat fusion property with the upper surface can be adjusted.

The thickness of the second thermosetting resin layer (1c), that is, the thickness of the thermoplastic resin (C) is not particularly limited, but the heat-sealing property with the upper surface of the flange portion (41) of the container (4) and Considering the sealing property (airtightness), strength, durability, impact resistance, etc. of the package (8), it is usually 20 μm to 200 μm, preferably 30 μm to 100 μm.

1-2. Deformation example of laminated body

The laminated body (1) may be a multilayer in which the first thermosetting resin layer (1a) is obtained by laminating two or more thermoplastic resins (A) of the same or the same type. Further, the second thermosetting resin layer (1c) may also be a plurality of layers in which two or more thermoplastic resins (C) of the same or the same type are laminated. As described above, by forming the first thermosetting resin layer (1a) and / or the second thermosetting resin layer (1c) into a multi-layer structure, a plurality of resealable sealing materials (2) can be obtained. Can be given the characteristics of.

The characteristics include, for example, improvement of the sealing strength between the lower surface of the lid material (6) and the first heat-sealing resin layer (1a), the first heat-sealing resin layer (1a) and the first heat-sealing resin layer (1a) at the time of sealing. / Or the suppression of excessive flow and deformation of the second heat-sealing resin layer (1c), prevention of breakage of the resealable sealing material (2) itself, the upper surface and the second surface of the flange portion (41) of the container (4). The improvement of the sealing strength with the heat-sealing resin layer (1c) of No. 2 and the improvement of the sealing property (airtightness), strength, durability, impact resistance, etc. of the package (8) can be mentioned.

In the laminate (1) of FIG. 1 (b), the first heat-sealing resin layer (1a) has a two-layer structure of a thermoplastic resin (A1) and a thermoplastic resin (A2), and the second The heat-sealing resin layer (1c) also has a two-layer structure consisting of a thermoplastic resin (C1) and a thermoplastic resin (C2). However, the number of layers of each layer is not particularly limited, and practically it is about 2 to 4 layers, but 5 or more layers are also possible.

As the thermoplastic resin (A1) and the thermoplastic resin (A2), the above-mentioned thermoplastic resin (A) can be used. Further, as the thermoplastic resin (C1) and the thermoplastic resin (C2), the above-mentioned thermoplastic resin (C) can be used.

The thermoplastic resin (A1) and the thermoplastic resin (A2) are preferably the same or the same type of material from the viewpoint of the sealing strength of the heat-sealed portion (7) on the lid material side. Further, the thermoplastic resin (C1) and the thermoplastic resin (C2) are preferably the same or the same kind of materials from the viewpoint of the heat seal strength of the heat-sealed portion (5) on the container side. With such a combination, the above-mentioned characteristics can be optimized. Specifically, the sealing property (airtightness), strength, durability, impact resistance, and the like of the package (8) can be improved.

The thickness of the first thermosetting resin layer (1a) having a multi-layer structure is not particularly limited, but the heat-sealing property with the lower surface of the lid material (6) and the sealing property (airtightness) of the package (8) ), Strength, durability, impact resistance and the like, it is usually 20 μm to 200 μm, preferably 30 μm to 100 μm.

The thickness of the second thermosetting resin layer (1c) having a multi-layer structure is also not particularly limited, but the heat-sealing property with the upper surface of the flange portion (41) of the container (4) and that of the package (8) Considering the sealing property (airtightness), strength, durability, impact resistance, etc., it is usually 20 μm to 200 μm, preferably 30 μm to 100 μm.

1-3. Other variants of the laminate

The laminate (1) is formed between the first thermosetting resin layer (1a) and the resealing pressure-sensitive adhesive layer (1b) and / or between the resealing pressure-sensitive adhesive layer (1b) and the second. A reinforcing layer may be provided between the thermosetting resin layer (1c). When the laminate (1) provided with the reinforcing layer is used as the resealable sealing material (2), the opening position of the lid material (6) can be adjusted and the resealable sealing material (2) can be broken at the time of opening. You can prevent it. Further, since the reinforcing layer has a heat insulating function, it is possible to prevent the adhesive (B) from squeezing out or flowing out from the end face of the resealing adhesive layer (1b) at the time of sealing.

The laminate (1) of FIG. 1 (c) is a reinforcing layer (11d) made of a resin (D1) between the first thermosetting resin layer (1a) and the resealing adhesive layer (1b). Is located. Further, a reinforcing layer (12d) made of a resin (D2) is also located between the resealing adhesive layer (1b) and the second thermosetting resin layer (1c).

As the resin (D1) and the resin (D2), a thermoplastic resin different from the thermoplastic resin (A) and the thermoplastic resin (C), or various known thermosetting resins can be used. Specifically, for example, stretched polyethylene terephthalate (PET), unstretched polyethylene terephthalate (PET), polyamide, biaxially stretched polyolefin and the like can be used, and these resins may be in the form of a film or a sheet. Further, as the reinforcing layer (11d) and / or the reinforcing layer (12d), various known epoxy-based or urethane-based thermoplastic resin coated layers or thermosetting resin coated layers can also be used.

The base treatment may be applied to one or both sides of the resin (D1) and / or the resin (D2). By such surface modification, for example, the adhesiveness between the first thermosetting resin layer (1a) and the reinforcing layer (11d), the adhesiveness between the reinforcing layer (11d) and the resealing adhesive layer (1b), The peelability of the resealing adhesive layer (1b), the adhesion between the resealing adhesive layer (1b) and the reinforcing layer (12d), and the adhesion between the reinforcing layer (12d) and the second thermosetting resin layer ( Adhesiveness with 1c) can be adjusted.

The thicknesses of the reinforcing layer (11d) and the reinforcing layer (12d) are not particularly limited and may be appropriately adjusted according to the purpose of use thereof, but both are usually 1 to 30 μm, preferably 3 to 20 μm.

1-4. Laminated manufacturing method

The manufacturing method of the laminated body (1) is not particularly limited, but industrially, a laminating method (heat laminating, dry laminating, etc.) and a coextrusion method can be mentioned.

In the case of the laminating method, for example, the laminated body (1) is obtained by laminating the thermoplastic resin (A) with the thermoplastic resin (C) via the adhesive (B). The order and conditions (temperature, pressure) of bonding are not particularly limited.

When the reinforcing layer (11d) and / or the reinforcing layer (12d) is provided on the laminated body (1), the thermoplastic resin (A) and the resin (D1) are bonded together, or the resin (D2) and the thermoplastic resin (D2) are bonded together. Various known adhesives can be used for bonding C). As the adhesive, various known adhesives can be used without particular limitation. For example, polyurethane adhesives such as two-component curable polyester-polyurethane adhesives and two-component curable polyether-polyurethane adhesives and acrylics. Examples thereof include system-based adhesives, epoxy-based adhesives, polyolefin-based adhesives, elastomer-based adhesives, and the like (hereinafter, the same shall apply when referred to as adhesives). The bonding order and conditions (temperature, pressure, etc.) are not particularly limited.

Examples of the coextrusion method include an inflation method and a T-die method. In the T-die method, for example, one or more thermoplastic resins (A), adhesives (B) and one or more thermoplastic resins (C), which are raw materials, and optionally resin (D1) and / Alternatively, the resin (D2) is set in an independent extruder to be heated and melted, and then the molten resin is transported to one T-die via a feed pipe and spread on a cooling roll from the discharge port. There is a way to make it. Conditions such as temperature and pressure at the time of coextrusion, transportation speed, cooling temperature and the like are not particularly limited.

1-5. Peeling mode of the laminate

In the usage mode of the laminate (1), the peeling of the first thermosetting resin layer (1a) and the second thermosetting resin layer (1c) is performed by the resealing adhesive layer (1b). It is made possible by interfacial fracture on one or the other surface or cohesive fracture of the resealing adhesive layer (1b). Specifically, it is made possible by any of the following peeling modes IF1, CF and IF2.

IF1: Interface failure that occurs at the interface on the first thermosetting resin layer (1a) side of the resealing adhesive layer (1b).
CF: Cohesive failure that occurs in the resealing adhesive layer (1b)
IF2: Interface fracture that occurs at the interface on the second thermosetting resin layer (1c) side of the resealing adhesive layer (1b) (hereinafter, may be referred to as IF2).

IF1 occurs between the first thermosetting resin layer (1a) and the resealing adhesive layer (1b) in the absence of the reinforcing layer (11d), and if present, the reinforcing layer (11d). Occurs between and the resealing adhesive layer (1b).
IF2 occurs between the resealing adhesive layer (1b) and the reinforcing layer (12d) if there is a reinforcing layer (12d), otherwise the resealing adhesive layer (1b) and the second It occurs between the thermosetting resin layer (1c) and the heat-sealing resin layer (1c).

The peeling mode includes a mode in which two or three types of IF1, CF and IF2 are mixed. However, the following aspects are not included.
-Peeling of the first thermosetting resin layer (1a), reinforcing layer (11d), reinforcing layer (12d) and second thermosetting resin layer (1c) due to material destruction-First thermosetting Peeling due to interfacial fracture between the sex resin layer (1a) and the reinforcing layer (11d) Peeling due to interfacial fracture between the reinforcing layer (12d) and the second thermosetting resin layer (1c)

The type of the peeling mode is determined by the magnitude relationship between the strength required for IF1 (F1), the strength required for CF (F2), and the strength required for IF2 (F3) (both in units of N / m). For example, peeling by IF1 occurs exclusively when F1 is smaller than F2 and F3, peeling by CF occurs when F2 is smaller than F1 and F3, and peeling by IF2 occurs exclusively when F3 is smaller than F1 and F2.

F1 is defined by, for example, the adhesive strength between the thermoplastic resin (A) or the resin (D1) and the pressure-sensitive adhesive (B), and the surface roughness or wettability index of the thermoplastic resin (A) and / or the resin (D1). To.
F2 is defined by, for example, the type and physical properties of the pressure-sensitive adhesive (B) and the curing conditions (temperature, amount of curing agent used, etc.).
F3 is defined by, for example, the adhesive force between the pressure-sensitive adhesive (B) and the resin (D2) or the thermoplastic resin (C), and the surface roughness to wetness index of the resin (D2) and / or the thermoplastic resin (C). ..

The magnitude relationship of F1, F2 and F3 is determined by the combination of thermoplastic resin (A), adhesive (B) and thermoplastic resin (C), and any resin (D1) and / or resin (D2). It can also be adjusted by the presence or absence of the base treatment in each resin.

2. Resealable sealant The resealable sealant (2) is the upper surface of the flange portion (41) formed on the opening peripheral edge (42) of the container (4) capable of accommodating the contents (9), and the container (4). ) Is a member that is interposed between the lower surface of the lid material (6) joined to the upper surface of the flange portion (42) so as to close the opening, and heat-seals these surfaces so as to be resealable.

Further, the resealable sealing material (2) has an opening having the same shape or a similar shape as the opening peripheral edge (42) of the container (4) inside. The shape of the opening is not limited and may be, for example, circular, oval, rounded triangle, rounded quadrangle and heart shape.

FIG. 2 shows one aspect of the resealable sealing material (2). This resealable sealing material (2) is heat-sealed to the upper surface of the flange portion (41) of the container (4). Also, its opening is circular, similar to the opening periphery (42) of the container (4). Further, the peripheral edge of the opening is contained within the circumferential region of the flange portion (41) of the container (4). With this configuration, the contents (9) can be easily taken out after the package (8) is opened.

The number of openings in the unit area of the resealable sealing material (2) is not particularly limited, and is usually the same as the number of openings in the container (4). Therefore, for example, if the container (4) has two openings, the number of openings of the resealable sealing material (2) is also two.

The shape of the outer edge of the resealable sealing material (2) may be determined so as to be interposed between the upper surface of the flange portion (41) and the lower surface of the lid material (6), but is usually used. Is the same or similar to the shape of the outer peripheral edge of the flange portion (41).

3. 3. Container with resealable sealant The container with resealable sealant (3) has a container (4) that can accommodate the contents (9) as the main body, and the resealable sealant is placed on the upper surface of the flange (41). (2) is heat-sealed in advance.

As shown in FIG. 2, the container (3) with the resealable seal material is composed of the resealable seal material (2) and the container (4).

The container (4) in FIG. 2 rises upward from the flange portion (41) protruding outward in the radial direction, the opening peripheral edge (42), the bottom wall (43), and the peripheral edge of the bottom wall (43). It is composed of a columnar peripheral wall (44). Further, the peripheral wall (44) is integrally formed with the flange portion (41) with the opening peripheral edge (42) as a boundary line.

In FIG. 2, the opening shape of the resealable sealing material (2) is the same or similar to the opening peripheral edge (42) of the container (4). Further, in this figure, the opening peripheral edge of the resealable sealing material (2) has a similar shape larger than that of the opening peripheral edge (42) of the container (4), as shown in FIG. 5 (c), for example. , It may have a similar figure smaller than the opening periphery (42).

The shape of the container (4) is not limited to that shown in FIG. For example, the shape of the bottom wall (43) may be circular, elliptical, rounded triangle, rounded quadrangle and heart shape, as in the opening periphery (42). Further, the shape of the flange portion (41) is not limited to the annular shape as shown in FIG. 2, and may be, for example, an elliptical ring road or a polygonal ring road. Further, the peripheral wall (44) is not limited to a columnar shape, and may be, for example, a polygonal columnar shape. Further, the peripheral wall (44) does not have to be vertically upright, and may be tapered, have a step at an intermediate position thereof, or be embossed. Further, the bottom wall (43) may be raised so that the cross section has a substantially trapezoidal shape.

FIG. 3 shows a preferred embodiment of the container (3) with a resealable sealing material. In this figure, the container (4) is composed of a container material (40), which is a multi-layer of an inner surface layer (40a) and a base material layer (40b). Further, the second thermosetting resin layer (1c) of the resealable sealing material (2) and the upper surface of the flange portion (41) are heat-sealed at the container-side heat-sealing portion (5). ..

In the container (3) with a resealable sealing material, the upper surface of the flange portion (41) of the container (4) is made of a heat-sealing resin from the viewpoint of the strength and reliability of the heat-sealing portion (5) on the container side. It is preferable that the second thermoplastic resin layer (1c) of the resealable sealing material (2) and the upper surface of the flange portion (41) are made of the same or the same kind of material.

In the container (3) with the resealable sealing material shown in FIG. 3, the inner edge (5) of the heat-sealing portion (5) on the container side is left in order to leave the unsealed portion (53) in the package (8) using the container (3). The 51) is located at least 1 mm, specifically 1 to 5 mm outside (that is, the side opposite to the container opening side) of the inner edge (52) of the resealable sealing material (2). In other words, between the lower surface of the second thermosetting resin layer (1c) of the resealable sealing material (2) and the upper surface of the flange portion (41), adjacent to the container-side thermosetting portion (5). As described above, an unsealed portion (53) having a width of at least 1 mm, specifically, a width of 1 to 5 mm is formed. Therefore, the unsealed portion (53) can be left on the container opening side even in the package (8) obtained by using the container (3) with the resealable sealing material having such a characteristic structure. As will be described in detail later, such a package (8) has good pressure resistance, durability and impact resistance when sealed, and can prevent complete peeling of the lid material (6) when opened.

The inner surface layer (40a) constitutes the upper surface of the flange portion (41) of the container (4). As the constituent material of the inner surface layer (40a), a resin capable of heat-sealing with the second thermosetting resin layer (1c) constituting the lower surface of the resealable sealing material (2) is preferable. Specifically, for example, high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), stretched polypropylene (OPP), unstretched polypropylene (CPP), acid-modified polypropylene (AMPP). , Poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin, acrylic copolymer resin and other thermoplastic resins. Further, the thermoplastic resin may be in the form of a film or a sheet. The thermoplastic resin may be a commercially available product, and for example, the Unilux LS series manufactured by Idemitsu Unitech Co., Ltd., and the Aroma series such as Aroma UT100 and Aroma-ET manufactured by Okamoto Co., Ltd. can be used. Further, the inner surface layer (40a) may be formed by laminating a plurality of film-shaped or sheet-shaped thermoplastic resins. Further, the inner surface layer (40a) may be filled with, for example, an epoxy-based or urethane-based thermoplastic resin coating layer or a thermosetting resin coating layer instead of the thermoplastic resin.

Examples of the constituent material of the base material layer (40b) include glass, metal, synthetic resin and the like.

Examples of the glass include borosilicate glass, aluminosilicate glass, soda lime glass and the like.

Examples of the metal include aluminum, aluminum alloy, stainless steel, copper, nickel and the like. When the base material layer (40b) contains a layer made of metal, the weather resistance of the metal layer is improved by arranging a layer made of synthetic resin on the outside (that is, the outside of the container (40)). Can be done.

The form of the metal is not particularly limited, and may be, for example, plate-shaped or foil-shaped. Further, one side or both sides of the metal may be subjected to, for example, a coating treatment among the above-mentioned base treatments. For example, any of the following solutions (i) to (iii) is suitable as a coating agent for improving the adhesiveness of the metal surface.

(i) A water-alcohol solution containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.
(ii) Phosphoric acid, at least one resin selected from the group consisting of acrylic resin, chitosan derivative resin and phenolic resin, and at least one compound selected from the group consisting of chromic acid and chromium (III) salt. Contains water-alcohol solution
(iii) At least one resin selected from the group consisting of phosphoric acid, acrylic resin, chitosan derivative resin and phenolic resin, and at least one compound selected from the group consisting of chromic acid and chromium (III) salt. A water-alcohol solution containing at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.

As the metal leaf, when the content (9) contained in the container (4) is required to maintain quality for a long period of time, such as food, aluminum (in consideration of cost, moldability, etc.) Alloy) foil is preferred. As the aluminum (alloy) foil, for example, a soft (O material) or hard (H18 material) pure aluminum foil or an aluminum alloy foil is preferable, and in consideration of press formability, the A1000 series or A8000 series specified by JIS H4160 is used. A soft material (O material) is preferable. In particular, A8021HO material, A8079HO material and A1N30-O material are suitable for cold forming such as deep drawing.

Examples of the synthetic resin include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), stretched polypropylene (OPP), unstretched polypropylene (CPP), and acid-modified polypropylene (AMPP). , Poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin and acrylic copolymer resin, polystyrene (PS), polyvinyl chloride ( PVC), polyester (PEs), polyamide (PA), polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA), polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN) And so on. Further, the synthetic resin may be in the form of a film or a sheet, and can be used in a state in which a plurality of the synthetic resins are laminated.

The container material (40) may be composed of only the base material layer (40b). For example, when the container (4) is a bottle or a glass container, the base material (40b) can be composed only of glass. In this case, the thick portion of the opening peripheral edge (42) can be regarded as the flange portion (41). Further, when the container (4) is a can, it can be composed of only metal, and when the container (4) is a plastic container, it can be composed of only synthetic resin. Further, on the surface of the base material (40b) made of only glass, metal or synthetic resin, in consideration of the strength and reliability of the container-side thermosetting portion (5), for example, epoxy resin, chlorinated polyolefin resin, or nitrification An overcoat layer made of a thermosetting crosslinkable resin such as cotton, an acrylic resin, a vinyl chloride-vinyl acetate copolymer (hereinafter, the same applies to the overcoat layer) may be provided. When the base material (40b) is made of only a synthetic resin, the synthetic resin is the same as or the same as the thermoplastic resin (C) in consideration of the strength and reliability of the heat-sealed portion (5) on the container side. It is preferable to select the same type of thermoplastic resin.

On the other hand, in the case of injection molding, the base material (40b) can be composed only of synthetic resin. In this case, as the synthetic resin, it is preferable to select the same or the same type of thermoplastic resin as the thermoplastic resin (C) in consideration of the strength and reliability of the heat-sealed portion (5) on the container side. In this case as well, the overcoat layer may be provided on the surface of the base material (40b).

When the container material (40) is composed of the inner surface layer (40a) and the base material layer (40b), the composite sheet material having the following configuration can be exemplified as the container material (40) in consideration of press molding.

(Laminate material (however, metal layer is not included. The same shall apply hereinafter))
-Inner surface layer (40a): film-like or sheet-like synthetic resin with one or more layers-Base material layer (40b): film-like or sheet-like synthetic resin with one or more layers

The thickness of the inner surface layer (40a) and the base material layer (40b) of the laminating material is not particularly limited, but is a second thermosetting resin for moldability, the inner surface layer (40a) and the resealable sealing material (2). Considering the heat-sealing property with the layer (1c) and the strength, durability, impact resistance, etc. of the container (4) and the package (8), it is usually 10 to 500 μm and 500 to 5000 μm, which are preferable. Is 30-300 μm and 1000-3000 μm.

(Metal laminate material)
-Inner layer (40a): One or more film-like or sheet-like synthetic resin-Inner layer of base material layer (40b): Metal leaf-Outer layer of base material layer (40b): One-layer or two or more film-like Or sheet-like synthetic resin

The thickness of each layer of the metal laminate is not particularly limited, but its moldability and the inner layer (1c) of the second thermosetting resin layer (1c) of the resealable sealing material (2) and the inner surface layer (40) of the container material (40). Considering the heat-sealing property with 40a) and the strength, durability, impact resistance, etc. of the container (4) and the package (8), they are usually 5 to 200 μm, 6 to 100 μm, and 9 to 50 μm, respectively. , Preferably 10 to 100 μm, 9 to 30 μm and 9 to 25 μm.

The laminating material and the metal laminating material as the container material (40) can be produced by various known laminating methods (heat laminating, dry laminating, etc.). In addition, the adhesive can be used if necessary.

A specific configuration example of the container material (40) made of a metal laminate material is shown below.

-Inner layer (40a): Unstretched polypropylene resin (CPP) film (5 to 200 μm thick, preferably 10 to 100 μm thick))
-Inner layer of base material layer (40b): Aluminum (alloy) foil of JIS H4160 O material (particularly A8079HO) (6 to 100 μm thick, preferably 9 to 30 μm thick)
-Outer layer of the base material layer (40b): polyester resin film (9 to 50 μm thick, preferably 9 to 25 μm thick)
Adhesive: Polyurethane resin adhesive

The container with resealable sealant (3) can be manufactured according to the molding method of the container (4) forming the main body. For example, when the container material (40) is the synthetic resin as a single material, the laminating material, or the metal laminating material, the molding method of the container (4) is a press such as deep drawing molding or overhang molding. Examples include molding and injection molding.

In the case of press molding, for example, the metal laminating material is used as the base material (40), and this is placed at a predetermined position of various known deep drawing molding devices (not shown) and molded into a desired container shape. , The container (4) is temporarily manufactured by trimming to form the flange portion (41).
Next, the resealable sealing material (2) processed to a predetermined size is placed on the upper surface of the flange portion (41) so that the opening is aligned with the opening peripheral edge (42) of the container (4), and then re-sealed. Press the heat sealer against the sealing material (2). In this way, the container-side heat-sealing portion (5) is formed between the second thermosetting resin layer (1c) of the resealable sealing material (2) and the flange portion (41).
At the time of pressing, a separator film that can be used under the heat seal temperature may be used. Examples of such a synthetic resin film having a higher melting point than the thermoplastic resin (C) constituting the lower surface of the resealable sealing material (2) include a polytetrafluoroethylene (PTFE) film and biaxially stretched film. Examples thereof include polyethylene terephthalate (PET) film.
Then, by trimming the resealable seal material (2) along the outer peripheral edge of the flange portion (41), a container (4) with the resealable seal material (2) as shown in FIG. 2 is obtained. Can be done.

When using injection molding, for example, the following two methods can be mentioned.

In the first method, a resealable seal is provided between the upper mold and the lower mold of a predetermined molding die (not shown) with an opening having the same or similar shape as the opening peripheral edge (42) of the container (4). Place material (2) and close the mold. Next, the high-temperature molten synthetic resin constituting the base material (40) is introduced from the lower mold resin injection path. At this time, the container-side heat-sealing portion (1c) between the second thermosetting resin layer (1c) forming the lower layer of the resealable sealing material (2) and the flange portion (41) of the container (4). 5) is formed. After that, the mold is removed, the burr on the bottom wall (43) of the container (4) is removed, and then the resealable sealing material (2) is trimmed along the outer peripheral edge of the flange portion (41). A container (3) with a resealable sealing material as shown in FIG. 2 can be obtained.

In the second method, the container (4) is temporarily manufactured without arranging the resealable sealing material (2) in a predetermined molding die (not shown). The overcoat layer may be provided on the inner surface of the container (4) or the upper surface of the flange portion. After that, in the same manner as the above-mentioned method by press molding, the resealable sealing material (2) processed to a predetermined size is placed on the upper surface of the flange portion (41) of the container (4), and then heat-sealed and trimmed. Thereby, a container (3) with a resealable sealing material as shown in FIG. 2 can be obtained.

4. Package The package (8) is formed by joining the lid material (6) to the upper surface of the flange portion (41) so as to close the opening of the container (4). The upper surface of the flange portion (41) of the container (4) is heat-sealed so as to be resealable by the resealable sealing material (2).

FIG. 4 shows a perspective view of one aspect of the package (8). In this figure, the lid material (6) is heat-sealed to the upper surface of the flange portion (41) of the container (4) via the resealable sealing material (2) (not shown). The container (4) can accommodate the contents (9) (not shown) such as food.

A preferred embodiment of the package (8) is that the lower surface of the lid material (6) is made of a thermosetting resin, and the thermosetting resin and the resealable sealing material (2) are the first. This is an embodiment in which the thermosetting resin layer (1a) of the above is made of the same or the same kind of material. In the package (8) of this aspect, a highly reliable seal is realized between the lower surface of the lid material (6) and the upper surface of the resealable sealing material (2).
Further, in a more preferable embodiment of the package (8), in the preferred embodiment, the upper surface of the flange portion (41) of the container (4) is made of a thermosetting resin, and the heat-sealing resin is used. This is an embodiment in which the second thermosetting resin layer (1c) of the resealable sealing material (2) is made of the same or the same kind of material. In the package (8) of this aspect, a highly reliable seal is realized between the lower surface of the resealable sealing material (2) and the upper surface of the flange portion (41) of the container (4).
As will be described in detail later, these packages (8) have good pressure resistance, durability and impact resistance, and can prevent the lid material (6) from being completely peeled off at the time of opening.

5 (a) to 5 (c) are cross-sectional views of a package (8) containing the contents (9). In this figure, the lid material (6) is composed of a lid material sheet material (60), and the lid material sheet material (60) is a multi-layer composed of a base material layer (60a) and an inner surface layer (60b). is there. Further, a lid material side heat-sealing portion (7) is formed between the lower surface of the lid material (6) and the first thermosetting resin layer (1a) of the resealable sealing material (2). ing.

Examples of the constituent material of the base material layer (60a) include metal foil and film-shaped or sheet-shaped synthetic resin.

Examples of the metal foil include aluminum foil, aluminum alloy foil, stainless steel foil, copper foil, nickel foil and the like. When the metal leaf is contained in the base material layer (60a), cracking of the metal leaf can be prevented by arranging a layer made of synthetic resin on the outside thereof (that is, the outside of the lid material (6)). ..

One side or both sides of the metal leaf may be coated in the base treatment. For example, the above-mentioned solutions (i) to (iii) are suitable as the coating agent for improving the adhesiveness of the metal foil surface.

As the metal leaf, when the content (9) contained in the container (4) is required to maintain quality for a long period of time, such as food, the aluminum (alloy) foil is considered in consideration of cost and the like. Is preferable. As the aluminum (alloy) foil, A8000-based soft material (O material) defined by JIS H4160 is preferable, and A8021HO material and A8079H-18 are particularly preferable.

Examples of the film-shaped or sheet-shaped synthetic resin include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), stretched polypropylene (OPP), and unstretched polypropylene (CPP). Acid-modified polypropylene (AMPP), poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin and acrylic copolymer resin, polystyrene (PS) ), Polyvinyl chloride (PVC), Polypropylene (PEs), Polypropylene (PA), Polycarbonate (PC), Polyethylene terephthalate (PET), Polybutylene terephthalate (PBT), Polyethylene (PA), Polyethylene naphthalate (PEN) and Poly Butylene naphthalate (PBN) and the like can be mentioned. Further, the synthetic resin can be used even in a state where a plurality of the synthetic resins are laminated.

The sheet material (60) for the lid material may be composed of only the base material layer (60a). When the base material layer (60a) is made of the film-shaped or sheet-shaped synthetic resin, the synthetic resin may include heat-sealing strength and reliability of the heat-sealing portion (7) on the lid material side. It is preferable to select the same or the same type as the thermoplastic resin (A) in consideration of the above.

The inner surface layer (60b) constitutes the lower surface of the lid material (6). As the constituent material of the inner surface layer (60b), a resin capable of heat-sealing with the first thermosetting resin layer (1a) constituting the upper surface of the resealable sealing material (2) is preferable. Specifically, for example, high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene (PP), unstretched polypropylene (CPP), acid-modified polypropylene (AMPP), Film-like or sheet-like thermoplasticity of poly (ethylene-propylene) random copolymer (rPP), polyethylene-polypropylene block copolymer (bPP), polyvinyl alcohol (PVA), ionomer resin, acrylic copolymer resin, etc. Resin is mentioned. The thermoplastic resin may be a commercially available product, and for example, the Unilux LS series manufactured by Idemitsu Unitech Co., Ltd., and the Aroma series such as Aroma UT100 and Aroma-ET manufactured by Okamoto Co., Ltd. can be used. Further, the inner surface layer (60b) may be a stack of a plurality of the thermoplastic resins. Further, as the thermoplastic resin, the same or the same kind of material as the thermoplastic resin (A) is preferable in consideration of the strength and reliability of the heat-sealed portion (7) on the lid material side. Further, the overcoat layer may be used as the inner surface layer (60b).

When the lid material sheet material (60) is composed of the base material layer (60a) and the inner surface layer (60b), the lid material sheet material (60) can be exemplified by a composite sheet material having the following configuration.

(Laminate material (however, metal layer is not included. The same shall apply hereinafter))
-Base layer (60a): one or more film-like or sheet-like synthetic resin-Inner layer (60b): one-layer or two or more film-like or sheet-like synthetic resin

The thicknesses of the base material layer (60a) and the inner surface layer (60b) of the laminating material are not particularly limited, but the first thermosetting resin layer (1a) of the inner surface layer (60b) and the resealable sealing material (2) is used. ), Etc., are usually 1 to 100 μm and 10 to 50 μm, preferably 5 to 80 μm and 20 to 40 μm in order.

(Metal laminate material)
-Outer layer of base material layer (60a): one or more film-like or sheet-like synthetic resin-Inner layer of base material layer (60a): metal foil-Inner surface layer (60b): one-layer or more film-like Or sheet-like synthetic resin

The thickness of each layer of the metal laminate is not particularly limited, but the heat-sealing property between the inner surface layer (60b) and the first thermosetting resin layer (1a) of the resealable sealing material (2) is taken into consideration. Then, it is usually 9 to 50 μm, 6 to 100 μm and 5 to 80 μm, preferably 9 to 25 μm, 9 to 30 μm and 10 to 50 μm, respectively.

The laminating material and the metal laminating material as the sheet material (60) for the lid material can be produced by various known laminating methods (heat laminating, dry laminating, etc.). In addition, the adhesive can be used if necessary.

A specific configuration example of the lid sheet material (60) made of a metal laminate material is shown below.

-Base layer (60a): Polyester resin film (9 to 50 μm thick, preferably 9 to 25 μm thick)
-Inner layer of inner layer (60b): JIS H4160 aluminum (alloy) foil (particularly A8079H-O or A8079H-H18) (6 to 100 μm thick, preferably 9 to 30 μm thick)
-Outer layer of inner surface layer (60b): polypropylene resin film (5 to 80 μm thick, preferably 10 to 50 μm thick)
Adhesive: Polyurethane resin adhesive

The lid material (6) has an inner surface layer (60b) processed to have the same or similar shape as the flange portion (41) of the container (4) on the lower surface (innermost surface) of the base material layer (60a) which is a continuum. It may have a partially two-layer structure (not shown).

The lid material (6) may be optionally provided with an opening tab (61). Its size and shape are not limited, and may be, for example, a semicircle, a triangle, or a quadrangle. Further, the opening tab (61) may be a part of the base material (60) constituting the lid material (6). Further, a separately prepared tab may be attached to a part of the outer peripheral edge of the lid material (6).

The package (8) can be manufactured by heat-sealing the lid material (6) to the flange portion (41) of the container (4) via the resealable sealing material (2).

The package (8) can be produced by, for example, the following method depending on whether or not the container (3) with the resealable sealing material is used.

When using a container with a resealable sealing material (3), after accommodating the contents (9) in the container (3), the sheet material (60) for the lid material so as to close the opening of the container (4) forming the main body. Cover with. Next, an annular heat sealer heated to a predetermined temperature, which has a shape similar to the flange portion (41) of the container (4), is pressed from above the sheet material (60) for the lid material at a predetermined pressure for a predetermined time. .. Further, as shown in FIG. 5A, for example, the sealing is preferably performed so that the unsealed portion (73) and the unsealed portion (53) remain in the resealable sealing material (2). After sealing, the lid material sheet material (60) is trimmed to match the outer edge of the flange portion (41) to obtain a package (8) having the lid material (6). Further, the lid material (6) is provided with an opening tab (61) as shown in FIGS. 4 and 5, so that the lid material (6) can be easily opened.

When the container with resealable seal material (3) is not used, the contents (9) are contained in the container (4), and then the resealable seal material (2) is placed on the upper surface of the flange portion (41). , Overlay so that the opening is aligned with the opening of the container (4). Next, the lid material sheet material (60) is further layered, and an annular heat sealer heated to a predetermined temperature is pressed against a predetermined time at a predetermined pressure. Also in this case, it is preferable that the sealing is performed so that the unsealed portion (73) and the unsealed portion (53) remain in the resealable sealing material (2), for example, as shown in FIG. 5 (a). After sealing, the lid material sheet material (60) is also trimmed to match the outer edge of the flange portion (41) to obtain a package (8) having the lid material (6). Similarly, the lid material (6) may be provided with an opening tab (61).

The contents (9) contained in the package (8) include, for example, processed foods containing a large amount of water or oil such as butter, margarine, cheese, jam, dressing, curry, stew, soup and coffee fresh; miso, Fermented foods such as mash, jiuqu, amazake; anaerobic or photophobic industrial products such as films, pharmaceuticals, chemicals and detergents; sanitary products such as wet tissues and wet gauze; detergent-impregnated towels Cleaning supplies such as (mash); other industrial parts such as screws and bolts.

In a preferred embodiment of the package (8), the inner (container opening side) edge (71) of the lid material side heat-sealing portion (7) is the inner (container opening side) edge of the resealable sealing material (2). It is located at least 1 mm outside (72), specifically 1 to 5 mm outside (opposite the container opening).
In another preferred embodiment of the package (8), the inner (container opening side) end edge (51) of the container side heat-sealing portion (5) is the inner (container opening side) end of the resealable sealing material (2). It is located at least 1 mm outside the edge (52), specifically 1-5 mm outside (opposite the container opening).
In another preferred embodiment of the package (8), the inside (container opening side) edge (71) (51) of the lid material side heat fusion part (7) is inside the resealable sealing material (2) (container). (Opening side) It is located at least 1 mm outside the edge (72) (52), specifically 1 to 5 mm outside (opposite the container opening).
That is, the package (8) of the preferred embodiment has a specific width of 1 mm on the upper surface and / or the lower surface of the inner (container opening side) edge (72) (52) side of the resealable sealing material (2). Is formed with an unsealed portion (73) and / or an unsealed portion (53) having a width of 1 to 5 mm.

5 (a) to 5 (c) are partial cross-sectional views of the package (8) in a preferred embodiment. In each figure, an unsealed portion (73) and an unsealed portion (53) are formed on the upper surface and the lower surface of the inner (container opening side) edge (72) (52) side of the resealable sealing material (2). Has been done.

In the package (8) of FIG. 5 (a), the widths of the heat-sealed portion (7) on the lid material side and the heat-sealed portion (5) on the container side are the same, and the resealable sealing material (2). There are unsealed portions (73) (53) of the same width on the upper surface and the lower surface on the inner side (container opening side) edge (72) (52) side.

Similar to that of FIG. 5 (a), the package (8) of FIG. 5 (b) has the same width of the lid material side heat-sealed portion (7) and the container-side heat-sealed portion (5), and has the same width. , There are unsealed portions (73) (53) of the same width on the upper surface and the lower surface on the inner (container opening side) edge (72) (52) side of the resealable sealing material (2). On the other hand, unsealed portions (74) and (54) are also formed on the upper and lower surfaces on the outer edge side of the resealable sealing material (2) (opposite to the container opening), and these are the lid materials (6). It can be used as an opening opening. It should be noted that either one of the unsealed portions (74) and (54) as the opening cut may be used.

In the package (8) of FIG. 5 (c), the widths of the heat-sealed portion (7) on the lid material side and the heat-sealed portion (5) on the container side are the same as those in FIG. 5 (a), and the widths are the same. , There are unsealed portions (73) (53) of the same width on the upper surface and the lower surface on the inner (container opening side) edge (72) (52) side of the resealable sealing material (2). Further, both unsealed portions are configured to protrude inward beyond the opening peripheral edge (42) of the container (4). Although not shown, in this embodiment as well, the unsealed portion (74) and / or the unsealed portion as an opening cut is on the outer edge side (opposite side of the container opening) of the resealable sealing material (2). (54) can be formed.

Those having an unsealed portion on the inner (container opening side) edge (72) (52) side of the resealable sealing material (2), such as the package (8) shown in FIG. 5, have already been described. As described above, the pressure resistance, durability, and impact resistance at the time of sealing are improved. The possible reasons will be described below, but the technical scope of the present invention is not limited by these reasons.

FIG. 6 shows that when the content (9) contained in the package (8) is a fermented food or a processed food that releases a large amount of water by cooking, the package (8) has an internal pressure. It shows how it expands due to the increase.

In FIG. 6, due to expansion, the package (8) has a constant area gap both above the container opening side edge (72) and below the same edge (52) of the resealable sealing material (2). Is occurring. At this time, the stress pushing up in the direction of the up arrow near the end edge (71) on the container opening side of the lid material side heat fusion part (7), and the end edge on the container opening side of the container side heat fusion part (5). In the vicinity of (51), stresses that push down in the direction of the down arrow are generated.

Here, since the package (8) of FIG. 6 has an unsealed portion (73) and an unsealed portion (53) having a predetermined width, the pressure generated inside can be applied to the heat-sealed portion on the lid material side having high sealing strength. It can be guided to (7) and the heat fusion part (5) on the container side. Therefore, it is possible to prevent internal peeling that may occur at the container opening side edge of the resealing adhesive layer (1b) having a relatively low peel strength. It should be noted that such an effect can be achieved by either the unsealed portion (73) or the unsealed portion (53), but it is preferable that both are present in order to disperse the internal pressure more.

Further, in the above mechanism, the content (9) of the package (8) is a heavy object such as an industrial part, and the content is on the lower surface of the lid material (6) or the inner surface of the container (4) during transportation or dropping. It works in the same way when (9) collides.

Next, the opening mechanism of the package (8) will be described. In the package (8), the lid material (6) heat-sealed to the container flange portion (41) can be peeled off by peeling off the laminate (1) forming the resealable sealing material (2). To. That is, the lid material (6) can be peeled off by peeling the first thermosetting resin layer (1a) and the second thermosetting resin layer (1c) of the resealable sealing material (2). This peeling is possible by interfacial fracture on one surface or the other surface of the resealing pressure-sensitive adhesive layer (1b) or cohesive destruction of the resealing pressure-sensitive adhesive layer (1b).

Here, the peel strength due to the interfacial fracture or cohesive fracture is set to be smaller than the peel strength of the heat-sealed portion (7) on the lid material side and the heat-sealed portion (5) on the container side. Therefore, when the lid material (6) is peeled off from the flange portion (41), the materials of the first thermosetting resin layer (1a) and the second thermosetting resin layer (1c) are not destroyed. Peeling proceeds exclusively between one surface of the resealing pressure-sensitive adhesive layer (1b) or between the layers of the resealing pressure-sensitive adhesive layer (1b). As a result, the resealing adhesive layer (1b) is exposed on the lower surface of the lid material (6) and / or the upper surface of the flange portion (41), and resealing with the lid material (6) becomes possible.

7 (a) to 7 (c) show the opening mode of the package (8).

In FIG. 7 (a), the peeling of the lid material (6) is due to the interfacial fracture (IF1) between the first thermosetting resin layer (1a) and the resealing adhesive layer (1b). It shows how it is occurring. In the case of this embodiment, the resealing adhesive layer (1b) appears on the upper surface of the flange portion (41) of the container (4). Then, the resealing can be performed by crimping the first heat-sealing resin layer (1a) remaining on the lower surface of the lid material (6) to the resealing adhesive layer (1b).

Further, although not shown, when the reinforcing layer (11d) is laminated on the lower surface of the first thermosetting resin layer (1a), IF1 is resealed with the reinforcing layer (11d). It occurs between the adhesive layer (1b) and resealing is also achieved between the two layers.

FIG. 7B shows how the lid material (6) is peeled off due to the cohesive failure (CF) of the resealing adhesive layer (1b). In the case of this embodiment, the resealing adhesive layer (1b) appears on both the lower surface of the lid material (6) and the upper surface of the flange portion (41). Then, the resealing can be performed by crimping the resealing adhesive layers (1b) to each other.

In FIG. 7 (c), the peeling of the lid material (6) is due to the interfacial fracture (IF2) between the resealing adhesive layer (1b) and the second thermosetting resin layer (1c). It shows how it is occurring. In the case of this embodiment, the resealing adhesive layer (1b) appears on the lower surface of the lid material (6). Then, the resealing can be performed by crimping the second heat-sealing resin layer (1c) remaining on the upper surface of the flange portion (41) to the resealing adhesive layer (1b).

Although not shown, when the reinforcing layer (12d) is laminated on the lower surface of the resealing adhesive layer (1b), IF2 is heat-sealed with the reinforcing layer (12d). It occurs between the sex resin layer (1c) and resealing is also realized between the two layers.

The opening mode of the package (8) is the same as the peeling mode of the laminated body (1), that is, the peel strength required for IF1 (F1), the peel strength required for CF (F2), and the peel strength required for IF2 (F3). The unit is determined by the magnitude relationship of N / m). For example, the peeling by IF1 (Fig. 7 (a)) is when F1 is smaller than F2 and F3, and the peeling by CF (Fig. 7 (b)) is when F2 is smaller than F1 and F3. FIG. 7 (c)) occurs exclusively when F3 is smaller than F1 and F2.

IF1 is the most preferable opening mode. That is, it is preferable that the resealing adhesive layer (1b) appears on the upper surface of the flange portion (41) after the lid material (6) is peeled off. In this aspect, when the lid material (6) is attached to the upper surface of the flange portion (41), it is easy to attach the lid material (6) to the upper surface of the flange portion (41) even if the position of the lid material (6) is slightly displaced.

F1 is due to the adhesive force between the thermoplastic resin (A) or the resin (D1) and the pressure-sensitive adhesive (B), F2 is due to the cohesive force of the pressure-sensitive adhesive (B), and F3 is due to the pressure-sensitive adhesive (B). It is exclusively defined by the adhesive strength with the resin (D2) or the thermoplastic resin (C). Therefore, the magnitude relation of F1, F2 and F3 is related to the combination of the thermoplastic resin (A), the adhesive (B) and the thermoplastic resin (C), any resin (D1) and the resin (D2), and the base material. It can be adjusted depending on the presence or absence of treatment or the like.

Further, as for the opening mode of the package (8), any one of IF1, CF and IF2 may be mainly generated, and as long as resealing with the lid material (6) is possible, two or three of them can be used. Also includes mixed modes. For example, although not shown, the lid material (6) is peeled off at the initial stage of opening mainly due to the interface destruction between the first thermosetting resin layer (1a) and the resealing adhesive layer (1b) by IF1. At the same time, cohesive failure of the resealing adhesive layer (1b) by CF may occur. At this time, the resealing adhesive layer (1b) is partially formed on the lower surface of the first thermosetting resin layer (1a) and / or the upper surface of the second thermosetting resin layer (1c). Although it remains, it is included in the opening mode of the package (8) as long as it can be resealed with the lid material (6) even in such a case.

The peeling mode of the lid material (6) includes a mode in which two or three types of IF1, CF and IF2 are mixed. However, in the peeling mode, the first thermosetting resin layer (1a), the reinforcing layer (11d), the reinforcing layer (12d), and the second thermosetting resin layer (1c) are peeled by material destruction. , Peeling of the first thermosetting resin layer (1a) and the reinforcing layer (11d) due to interfacial fracture, and peeling of the reinforcing layer (12d) and the second thermosetting resin layer (1c) due to interfacial fracture. Is not included.

One of the simple methods for switching the peeling mode of the package (8) is to replace the constituent materials of the lid material (60), the resealable sealing material (2), and the container material (40).
For example, first, the inner surface layer (60b) of the lid material sheet material (60) and the first heat-sealing resin layer (1a) of the resealable sealing material (2) are made of the same thermoplastic resin (AX) (AX). The second heat-sealing resin layer (1c) of the resealable sealing material (2) and the inner surface layer (40a) of the container material (40) are also made of the same thermoplastic resin (CX). ) (Not shown), the heat-sealing portion (7) on the lid material side and the heat-sealing portion (4) on the container side both realize a highly reliable seal.
Here, the peel strength (F1) required for the interfacial fracture (IF1) of the heat-sealed portion (7) on the lid material side is the peel strength (F2) required for the cohesive fracture (CF) of the adhesive layer for resealing (1b). If the peel strength (F3) required for the interfacial fracture (IF2) of the heat-sealed portion (4) on the container side is smaller than both and F2 is larger than F3, the lid material (6) is determined by IF1. That is, it is peeled off by breaking at the interface between the first heat-sealing resin layer (1a) and the resealing pressure-sensitive adhesive layer (1b). In this case, the resealing adhesive layer (1b) appears on the upper surface of the flange portion (41).
On the contrary, in the package (8), both the inner surface layer (60b) of the lid material sheet material (60) and the first heat-sealing resin layer (1a) of the resealable sealing material (2). Is composed of a thermoplastic resin (CX), and both the second heat-sealing resin layer (1c) of the resealable sealing material (2) and the inner surface layer (40a) of the container material (40) are If the adhesive (B) that is composed of the thermoplastic resin film (AX) and constitutes the resealing adhesive layer (1b) is not changed, the lid material (6) is made by IF2, that is, the resealing adhesive. It is peeled off by interfacial fracture between the agent layer (1b) and the second heat-sealing resin layer (1c). In this case, the resealing adhesive layer (1b) appears on the lower surface of the lid material (6).

FIG. 8 is a top view of the initial mode of opening the package (8), and corresponds to FIG. 7 (a). In this figure, the resealing adhesive layer (1b) appears from the position adjacent to the opening tab (61) at the same time as the lid material (6) is peeled off, and it becomes the flange portion due to the peeling of the lid material (6). The appearance of unfolding in the circumferential direction of the upper surface of (41) is depicted.

FIG. 9 is a top view of the late-opening aspect of the package (8) of FIG. 8, in which the resealing adhesive layer (1b) is formed in an annular shape on the outer peripheral edge of the flange portion (41) of the container (4). Has been done.
In addition, an annular container is located between the lower surface of the second thermosetting resin layer (1c) located below the annular resealing adhesive layer (1b) and the upper surface of the flange portion (41). A side heat fusion part (5) is formed. However, since the heat-sealing portion (5) on the container side cannot be directly illustrated, this is a broken line drawn in the outer peripheral edge of the resealing adhesive layer (1b) and the region of the resealing adhesive layer (1b). The location between the circle and the wavy line is specified by the broken line.
On the other hand, the thermosetting resin (60b) constituting the lower surface of the lid material (6) has an annular first thermosetting resin layer (1a) constituting the upper surface of the resealable sealing material (2). ) Remains in the heat-sealed state. Further, between the annular thermosetting resin layer (1a) and the thermosetting resin (60b) constituting the lower surface of the lid material (6), the annular lid material side heat-sealing portion ( 7) is formed. However, since the heat-sealing portion (7) on the lid material side cannot be directly illustrated, this is the outer peripheral edge of the annular first thermosetting resin layer (1a) and the thermosetting resin layer (1a). The location between the broken line circle drawn in the area is specified by the broken line wavy line.

In FIG. 9, the broken lines P1, P2 and P3 represent the peeling positions of the lid material (6). Further, in order to correspond to that of FIG. 7 (a), the package (8) in this figure has an unsealed portion (73) on the lid material side heat-sealed portion (7) side of the resealable sealing material (2). However, an unsealed portion (53) is formed on the heat-sealed portion (5) side on the container side.

FIG. 10 is a partial cross-sectional view of the package (8) near the flange portion (41) in the process of shifting the peeling position of the lid material (6) to P1, P2 and P3.

FIG. 10A shows a partial cross-sectional view of the line segment AA'when the peeling position of the lid material (6) is at the broken line P1 in FIG. At this time, the total length of the peel wires formed between the lower surface of the lid material (6) and the upper surface of the flange portion (41) is relatively short, and the peeling force of the lid material (6) is also relatively small.

FIG. 10B shows a partial cross-sectional view of the line segment B-B'when the peeling position of the lid material (6) is at the broken line P2 in FIG. Then, from P1 to P2, the peeling force of the lid material (6) gradually increases as the total length of the peel wires formed between the lower surface of the lid material (6) and the upper surface of the flange portion (41) increases. To do.

FIG. 10 (c) shows a partial cross-sectional view of the line segment C-C'when the peeling position of the lid material (6) is at the broken line P3 in FIG. Then, as shown in FIG. 9, when the peeling position reaches the broken line P3, the total length of the peel lines formed by the lower surface of the lid material (6) and the upper surface of the flange portion (41) becomes maximum. , The consumer senses a rapid increase in peeling resistance at the fingertips, and by stopping the operation with this as an opportunity, the complete peeling of the lid material (6) can be avoided. Further, since the lid material (6) is still connected to the upper surface end of the flange portion (41) of the container (4), the lid material (6) can be attached to the upper surface of the flange portion (41) again. It is possible to reseal without special alignment of 6).

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the technical scope of the present invention is not limited thereto.

1. 1. Preparation of laminate for resealable sealing material

Laminated body A
The materials shown below were prepared as the materials for the laminate.
-Thermoplastic resin for the first thermosetting resin layer: Linear low density polyethylene (LLDPE) film (30 μm thickness)
-Adhesive for resealing adhesive layer: Methyl ethyl ketone (MEK) solution of acrylic ester copolymer (solid content concentration 30% by mass)
-Thermoplastic resin of the second thermosetting resin layer: unstretched polyolefin (CPP) film (50 μm thickness)

The adhesive is applied to the CPP film so that the thickness after drying is 20 μm, dried at 100 ° C. for 10 seconds, and then the LLDPE film is bonded and aged at 40 ° C. for 5 days. A laminate A was produced. The laminate A was used as a material for the resealable sealing material A.

Laminated body B
In the laminate A, as a pressure-sensitive adhesive, a pressure-sensitive adhesive set (solid content excluding silica beads) formed by mixing silica beads having an average primary particle size of 2 μm with a MEK solution of an acrylic pressure-sensitive adhesive polymer mainly made of acrylic acid esters. The laminate B was prepared in the same manner except that the concentration was 30% by mass and the silica bead content was 5% by mass). The laminate B was used as a material for the resealable sealing material B.

2. Manufacture of containers with resealable sealant

Container A with resealable sealing material A
The following materials were prepared as container materials.
-Thermoplastic resin for the inner layer: CPP film (30 μm thickness)
-Metal for the inner layer of the base layer: Aluminum foil with base treatment-Synthetic resin for the outer layer of the base layer: CPP film (50 μm thickness)

As the base-treated aluminum foil, a treatment solution composed of phosphoric acid, polyacrylic acid, chromium (III) salt compound, water and alcohol is applied to both sides of a 120 μm-thick aluminum foil (JIS H4160 A8079-O material). , The amount of chromium adhered after drying was 10 mg / m ^2, and the mixture was dried at 180 ° C. and used.

Next, a commercially available polyester polyurethane adhesive was applied to one surface of the base-treated aluminum foil so that the film thickness was 3 μm, and then the CPP film (50 μm thickness) was attached. Next, a commercially available polyester polyurethane adhesive was applied to the other surface of the base-treated aluminum foil so that the film thickness was 3 μm, and then the CPP film (thickness of 30 μm) was attached. The composite sheet thus obtained was heat-aged at 40 ° C. for 8 days to prepare a container material.

Next, this container material is set in a commercially available press die machine so that a CPP film having a thickness of 50 μm is on the inner surface, and after drawing and forming, the portion corresponding to the flange portion is punched out with a trimming die of 82 mmφ. A cup-shaped container A having a diameter of 66 mm, a bottom diameter of 56 mm, a height of 30 mm, and a flange width of 8 mm and having a circular opening peripheral edge was produced.

Next, a laminate A cut to 100 mm × 100 mm is laminated on the annular flange portion of the container A so that the CPP film is on the lower surface, and then a PET film having a thickness of 25 μm is applied to the container A, and then 180. A hot plate (sealer) heated to ° C. was pressed at a pressure of 0.2 MPa for 3 seconds, and heat-sealed from 3 mm to 8 mm inside the flange portion. Subsequently, a trimming mold having a diameter of 82 mm was used to align the peripheral edge of the heat-sealed laminate A with the peripheral edge of the flange portion of the container A. Subsequently, the center of the laminated body A after trimming was cut out in a circle of 66 mmφ along the opening peripheral edge of the container A to prepare a container A with a resealable sealing material A.

Container A with resealable sealing material B
In the container A with the resealable sealing material A, the container A with the resealable sealing material B was produced in the same manner except that the laminated body A was replaced with the laminated body B.

Container B with resealable sealing material A
A polypropylene resin was injected into a mold capable of producing a cup-shaped container having a diameter of 66 mφ, a bottom diameter of 56 mmφ, a height of 30 mm, a flange width of 8 mm and a thickness of 1 mm (only the flange portion was 2 mm) to prepare a container B.

Next, a laminate A cut into 100 mm × 100 mm was laminated on the flange portion of the container B so that the CPP film was on the lower surface, and then a PET film having a thickness of 25 μm was applied and then heated to 180 ° C. A container B with a resealable sealing material A was produced by pressing a hot plate at a pressure of 0.2 MPa for 3 seconds and heat-sealing the inside of the flange portion from 4 mm to 8 mm.

3. 3. Preparation of packaging

Lid material A
A commercially available polyester polyurethane adhesive was applied to one side of a 20 μm thick aluminum foil (A1N30-O material of JIS H4160) so as to have a thickness of 3 μm, and a polyethylene terephthalate (PET) film was attached. Next, a commercially available polyester polyurethane adhesive was applied to the other surface of the aluminum foil so as to have a thickness of 3 μm, and a linear low density polyethylene (LLDPE) film (50 μm thickness) was attached. .. The sheet material thus obtained was heat-aged at 40 ° C. for 8 days, and then cut into a square shape of 120 mm square to prepare a lid material A.

Example 1
Package A
The lid material A is placed on the flange portion of the container A (press molded) with the resealable sealing material A so that the LLDPE film is on the lower surface, and then the temperature is 180 ° C. from the PET film side forming the upper surface thereof. The heated hot plate was pressed at a pressure of 0.2 MPa for 3 seconds, and heat-sealed to a position 5 mm from the outside of the flange portion. Subsequently, the peripheral edge of the lid material A was trimmed along the outer peripheral edge of the flange portion so that an opening tab remained in a part thereof to prepare a test package A.

Example 2
Package B
The lid material A is placed on the flange portion of the container A (press molded) with the resealable sealing material B so that the LLDPE film is on the lower surface, and then the temperature is 180 ° C. from the PET film side forming the upper surface thereof. The heated hot plate was pressed at a pressure of 0.2 MPa for 3 seconds, and heat-sealed to a position 5 mm from the outside of the flange portion. Subsequently, the peripheral edge of the lid material A was trimmed along the outer peripheral edge of the flange portion so that an opening tab remained in a part thereof to prepare a test package B.

Example 3
Package C
The lid material A was placed on the flange of the container B (injection molding) with the resealable sealing material A so that the LLDPE film was on the lower surface, and then heated to 180 ° C. from the PET film side forming the upper surface thereof. The hot plate was pressed at a pressure of 0.2 MPa for 3 seconds to perform heat sealing to a position 4 mm from the outside of the flange portion. Subsequently, the peripheral edge of the lid material A was trimmed along the outer peripheral edge of the flange portion so that an opening tab remained in a part thereof to prepare a test package C.

Example 4
Package D
The laminate A was cut into 100 mm × 100 mm, and an opening of 66 mmφ was provided in the center thereof to prepare a resealable sealing material A, which was laminated on the flange portion of the container A. Specifically, the resealable sealing material A was superposed on the upper surface of the flange portion so that the CPP film was on the lower surface and the opening was aligned with the opening of the container A. Subsequently, a lid material A cut to 100 mm × 100 mm was laminated on the resealable sealing material A so that the LLDPE film was on the lower surface. Subsequently, the hot plate heated to 180 ° C. is pressed from the PET film side forming the upper surface of the lid material A at a pressure of 0.2 MPa for 4 seconds so that the sealing width of the flange portion is 8 mm on both the upper and lower surfaces. Heat-sealed by. Subsequently, a packaging body D for testing was obtained by punching the lid material A together with the laminated body A using a trimming mold having an diameter of 82 mmφ.

Example 5
Package E
In the first embodiment, the same applies except that the laminate A is sealed with the full width (8 mm) of the flange portion of the container A, and the lid material A is also sealed with the full width (8 mm) of the flange portion of the container A. A test package E was prepared.

Table 1 shows the types, materials and dimensions of the constituent members of the packages A to E, and the widths of the heat-sealed portion on the lid material side, the heat-sealed portion on the container side, and the unsealed portion.

5. Evaluation of packaging (measurement of opening strength and reopening strength)
The package A is set in the tensile tester at an angle of 45 ° so that the opening tab of the lid material A is on the bottom, and the opening tab is pulled up vertically to peel the lid material A from the flange portion. The peel strength at the initial stage of opening was measured by allowing the mixture to be 20.3 N / mm.

Further, in the process of advancing the peeling, the peeling strength was kept almost constant, but the peeling strength increased when the peel line crossed the peripheral edge of the container opening, so the testing machine was stopped and the package A was removed. It was.

Next, the lid material A connected to the end of the flange portion was re-superposed on the flange portion, lightly pressed along the peripheral edge of the flange portion, and then the opening strength was measured again by the same method as described above. It was 8 N / mm.

Then, after resealing by the same method as described above, the operation of measuring the opening strength was repeated 9 times. Table 2 shows the values of peel strength after resealing.

After the measurement was completed, when I put my finger on the upper surface of the flange, I felt a light tack. On the other hand, no wrinkles were formed on the lower surface of the lid material A, and a plurality of heat-sealed portions were touched, but no tack was felt. Therefore, it was determined that the peeling mode of the package of Example 6 was IF1, and that interfacial fracture occurred between the LLDPE film of the laminate A, which is the resealable sealing material, and the pressure-sensitive adhesive layer.

The peel strength of the package B was also tested in the same manner. The results are shown in Table 2. Further, no wrinkles were generated on the lower surface of the peeled lid material A, and it was determined that the peeling mode was IF1 for the same reason as described above.

The peel strength of the package C was also tested in the same manner. The results are shown in Table 2. Further, no wrinkles were generated on the lower surface of the peeled lid material B, and it was determined that the peeling mode was IF1 for the same reason as described above.

The peel strength of the package D was also tested in the same manner. However, since there was no unsealed portion in the package and the peel strength did not increase even after the peel wire crossed the peripheral edge of the container opening, the testing machine was immediately stopped to prevent the lid material A from completely peeling. .. Subsequently, the peel strength after resealing was tested in the same manner as in the package A. Further, no wrinkles were generated on the lower surface of the peeled lid material A, and it was determined that the peeling mode was IF1 for the same reason as described above. The results are shown in Table 2.

The peel strength of the package E was also tested in the same manner. However, since there is no unsealed portion in the package, the testing machine was immediately stopped after the peel wire crossed the peripheral edge of the container opening to prevent the lid material A from being completely peeled off. Subsequently, the peel strength after resealing was tested in the same manner as in the package A. Further, no wrinkles were generated on the lower surface of the peeled lid material A, and it was determined that the peeling mode was IF1 for the same reason as described above. The results are shown in Table 2.

The laminate for a resealable sealing material of the present invention can be used as a member that imparts sealability, easy opening property, and resealability to a package containing contents such as foods and pharmaceuticals.

(1): Laminated material for resealable sealing material
(1a): First thermosetting resin layer
(1b): Adhesive layer for resealing
(1c): Second thermosetting resin layer
(11d): Reinforcement layer
(12d): Reinforcement layer
(A) (A1) (A2): Thermoplastic resin
(B): Adhesive for resealing
(C) (C1) (C2): Thermoplastic resin
(D1) (D2): Resin
(2): Resealable sealing material
(3): Container with resealable sealing material
(4): Container
(40): Container material
(40a): Inner layer
(40b): Base material layer
(41): Flange part
(42): Aperture margin
(43): Bottom wall
(44): Peripheral wall
(5): Heat-sealed part on the container side
(51): End edge of the heat-sealed portion on the container side on the container opening side
(52): Resealable sealing material container opening side edge (flange upper surface side)
(53): Unsealed part on the container opening side
(54): Unsealed part on the opposite side of the container opening
(6): Lid material
(60): Sheet material for lid material
(60a): Base material layer
(60b): Inner layer
(61): Opening tab
(7): Heat fusion part on the lid material side
(71): End edge of the heat-sealed portion on the lid material side on the container opening side
(72): Resealable sealing material container opening side edge (lower surface side of lid material)
(73): Unsealed portion on the container opening side
(74): Unsealed part on the opposite side of the container opening
(8): Package
(9): Contents

Claims (11)

These are interposed between the upper surface of the flange portion formed on the peripheral edge of the opening of the container capable of accommodating the contents and the lower surface of the lid material joined to the upper surface of the flange portion so as to close the opening of the container. A laminate used as a material for a resealable sealing material that heat-seals the surface so that it can be resealed.
A first thermosetting resin layer that can be heat-sealed with the lower surface of the lid material,
A second thermosetting resin layer that can be heat-sealed with the upper surface of the flange portion,
A resealing pressure-sensitive adhesive layer for joining the first thermosetting resin layer and the second thermosetting resin layer,
Is equipped with
The peeling of the first thermosetting resin layer and the second thermosetting resin layer causes interfacial destruction on one surface or the other surface of the resealing pressure-sensitive adhesive layer or the resealing pressure-sensitive adhesive. It is characterized by being made possible by cohesive failure of layers,
Laminated body. The laminate for a resealable sealing material according to claim 1, wherein the resealable pressure-sensitive adhesive layer contains a filler. The laminate for a resealable sealing material according to claim 1 or 2, wherein the average primary particle size of the filler is 1 to 50 μm. These surfaces can be resealed by interposing between the upper surface of the flange portion formed on the peripheral edge of the opening of the container and the lower surface of the lid material joined to the upper surface of the flange portion so as to close the opening of the container. A heat-sealing resealable sealing material
It is formed from the laminate according to any one of claims 1 to 3, and has an opening having the same or similar shape as the opening peripheral edge of the container inside.
Resealable sealing material. A container that has a flange on the periphery of the opening and can accommodate the contents,
The resealable sealing material according to claim 4, which is heat-sealed on the upper surface of the flange portion, is provided.
Container with resealable sealant. The upper surface of the flange portion of the container is made of a thermosetting resin, and the thermosetting resin and the second thermosetting resin layer of the resealable sealing material are made of the same or the same material. Is,
The container with the resealable sealing material according to claim 5. The inner edge of the container-side heat-sealing portion formed by heat-sealing a second heat-sealing resin layer of the resealing sealing material on the upper surface of the flange portion of the container is the resealing seal. The container with the resealable sealing material according to claim 5 or 6, which is located at least 1 mm outside the inner edge of the material. A package containing the contents, which is formed by joining a lid material to the upper surface of the flange portion so as to close the opening of the container having the flange portion on the peripheral edge of the opening.
The lower surface of the lid material and the upper surface of the flange portion are heat-sealed so as to be resealable by the resealable sealing material of claim 4 interposed between these surfaces.
Packaging body. The lower surface of the lid material is made of thermosetting resin, and
The thermosetting resin and the first thermosetting resin layer of the resealable sealing material are the same or the same kind of material.
The packaging body of claim 8. The upper surface of the flange portion of the container is made of a thermosetting resin, and the heat-sealing resin and the second heat-sealing resin layer of the resealing sealing material are the same or the same type. The package according to claim 8 or 9, which is a material. The inner edge of the lid material side heat-sealing portion formed between the lower surface of the lid material and the first thermosetting resin layer of the resealable sealing material.
And / or
The inner edge of the container-side heat-sealing portion formed between the upper surface of the flange portion of the container and the second thermosetting resin layer of the resealing sealing material is formed.
It is located at least 1 mm outside the inner edge of the resealable sealant.
The package according to any one of claims 8 to 10.

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