JP2001158470A - Lid member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain an appropriate degree of opening characteristic when the lid is opened in the case that a covering layer 2 is temporarily opened or re- sealed during eating or cooking for a lid member 1 for a cup-like container having a laminer configuration comprised of the covering layer 2 and a base material layer 5 formed with a food inlet or outlet. SOLUTION: The aforesaid object is accomplished by a lid member 1 having a laminer configuration in which a surface of an adhering agent layer 3 of the covering layer 2 composed of plastic provided with a re-peeling adhering layer 3 or plastic including a paper layer is adhered to a surface of a peeling agent layer 4 of a base material layer 5 having the peeling agent layer 4 at one surface and a heat seal layer 6 at the other surface, wherein the base material layer 5 as well as the heat seal layer 6 is provided with a recess 8 having a shape corresponding to that of the inlet or outlet so as to enable food inlet or outlet to be formed when the covering layer 2 is peeled off, and the heat seal layer 6 is abutted against the flange of the opening of the cup-like container 7 to perform a heat seal sealing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material for a cup-shaped container which is directly heat-sealed and sealed to a cup-shaped container.

[0002]

2. Description of the Related Art Conventionally, confectionery, beverages, instant foods, and the like are filled in a cup-shaped container made of waterproof paper or plastic, and a plastic molded lid, that is, a lid made of polypropylene, polyester, or the like is attached. A lid material that is heat-sealed to a cup-shaped container with a paper having a heat-sealing layer, a paper with an aluminum foil stuck thereon, or a plastic is known.

[0003] The former plastic molding lid can be opened and closed as many times as possible, but because of insufficient sealing strength, it is necessary to fill nitrogen, use an oxygen scavenger, etc., that is, to maintain oxygen gas barrier properties, moisture, and food flavor. Not suitable. An auxiliary material such as a shrink film is indispensable for loads such as transportation and stacking, and is not suitable for liquid foods having fluidity.

[0004] The latter can be applied to fluid foods such as liquid beverages by providing a certain degree of heat sealing strength, and can be applied to loads such as transportation and stacking without the aid of shrink film or the like. It does not come off. However, when preserving leftover confectionery, once the seal lid is removed, the lid cannot be resealed. Also, in the case of instant foods, when pouring hot water at the time of cooking and temporarily closing the lid again, a method of using aluminum foil to impart a certain degree of dead-holding property has been used.

[0005] Actual fairness 4-37093, actual fairness 4-154
No. 78 discloses a cover layer including a metal foil layer and a cover member and a cover sheet made of the metal foil cover layer. Although it is designed so that the coating layer can be temporarily resealed to the base material layer during drinking use or cooking, there is no design for an appropriate opening property at the time of opening. In addition, there is a problem that the method using aluminum foil does not conform to recent natural environmental measures and waste measures.

[0006]

SUMMARY OF THE INVENTION In a lid material for a cup-shaped container having a layer structure composed of a coating layer and a base material layer, the coating layer is temporarily opened and resealed from the base material layer during drinking and cooking. However, no consideration has been given to a proper opening property at the time of opening. Furthermore, there is a problem that the method using aluminum foil does not conform to recent natural environmental measures and waste measures, and there is a demand for improvement.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a cover material having an appropriate opening property when the cover layer is opened from the base material layer and a sufficient resealability.

[0008]

According to the present invention, the object of the present invention is to provide, in accordance with the present invention, the surface of the pressure-sensitive adhesive layer 3 of the coating layer 2 made of a plastic provided with a removable pressure-sensitive adhesive layer 3 or a plastic including a paper layer. The release layer 4 has a layer structure in which the release agent layer 4 is provided on one side and the release agent layer 4 is provided on the other side of the base layer 5 on which the heat seal layer 6 is provided.
The cut 8 is formed in a shape corresponding to the entrance so that the entrance of food and drink is formed when the coating layer 2 is peeled off.
This is achieved by the lid member 1 that performs heat sealing by applying the heat sealing layer 6 to the opening flange 9 of the cup-shaped container 7.

The above object is also achieved according to the present invention in that the surface of the pressure-sensitive adhesive layer 13 of the coating layer 12 made of a plastic having a removable pressure-sensitive adhesive layer 13 or a plastic including a paper layer, and a release agent on one surface. The layer 14 has a layer structure in which the surface of the release agent layer 14 of the base material layer 15 having the heat seal layer 6 provided on the other surface is laminated, and the base layer 15 including the heat seal layer 16 has a coating layer. The heat sealing layer 16 is applied to the opening flange 19 of the cup-shaped container 17 in which a cut 18 is formed in a shape corresponding to the entrance so as to form an entrance for food when peeling 12. In the lid material 11 for performing the cutting, a cut 21 is made in the covering layer 12 including the re-peelable pressure-sensitive adhesive layer 13 along the inside of the sealing portion of the opening flange 19 of the cup-shaped container 17, and the knob piece 20 is provided. It is achieved by a lid member 11 obtained by forming a closing portion that.

The above object is also achieved according to the present invention in that the surface of the pressure-sensitive adhesive layer 33 of the coating layer 32 made of a plastic having a removable pressure-sensitive adhesive layer 33 or a plastic including a paper layer, and a release agent on one surface. The layer 34 has a layer structure in which the surface of the release agent layer 34 of the base material layer 35 provided with the heat seal layer 36 on the other surface is bonded to the base material layer 35 including the heat seal layer 36. 32, an opening flange 39 of a cup-shaped container 37 having a cut 38 formed in a shape corresponding to the entrance so as to form an entrance for food when peeled off.
In the lid material 31 for applying the heat seal layer 36 to perform heat sealing and sealing, the knob piece 30 is sufficiently protruded from the opening flange 39, and the inside of the knob piece 30 is attached to the opening flange 39. A cover material 3 in which a cut 41 is formed in the base material layer 35 including the heat seal layer 36 except for a portion to be the knob piece 30 of the base material layer 35 along.
Achieved by 1.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The base material layer 5 in the present invention is made of plastic such as polyethylene, polypropylene, ethylene-propylene copolymer, polystyrene, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyvinyl alcohol, ethylene vinyl alcohol and the like. A film, a vapor-deposited film, a synthetic paper, or the like is used, and a paper layer is also used except when the content is a liquid or when the specification is such that a liquid is poured. In particular, when light-shielding properties and oxygen barrier properties are required, an aluminum foil layer can be used.

As the coating layer 2 in the present invention, a cover material 1
For heat-sealing, a film having a higher softening point than the base material layer 5 or the heat-sealing layer 6 is used. Films made of plastics such as polypropylene, ethylene-propylene copolymer, polystyrene, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyvinyl alcohol, and ethylene vinyl alcohol, vapor-deposited films, synthetic papers, and the like are used. In the case where the coating layer 2 is a film only, there is no stiffness depending on the film to be used, so that wrinkles are easily formed and it is difficult to remove the film. As the coating layer 2, a configuration including a paper layer in plastic is also used. In particular, when light-shielding properties and oxygen barrier properties are required, an aluminum foil layer can be used.

As the heat seal layer 6 in the present invention, polyethylene (PE) or unstretched polypropylene (CPP) is mainly used. That is, when taste and smell are important, low-odor grade low-density polyethylene (LDP)
E), medium density polyethylene (MDPE) or high density polyethylene (HDPE) for heat resistance, 3-5% ethylene vinyl acetate copolymer (EVA) blended LDPE for water
Ionomer (IO), Ethylene acrylic acid copolymer (EAA) for high temperature countermeasures during extrusion coating, Linear low density polyethylene (LLDPE) for compressive strength in water food packaging, especially LLDP with metallocene catalyst
E. When low-temperature sealability is required, it is appropriately selected from ultra-low density polyethylene (VLDPE) or the like.

Incidentally, polyolefin materials such as polyethylene and polypropylene are excellent in heat sealability, but when the heat seal layer 6 is an ethylene resin, components in the contents may be adsorbed, and the contents components at the time of filling may be absorbed. However, it is good to select a non-adsorptive sealant that can prevent deterioration before the consumer opens it.

As the non-adsorbent sealant, there are polyester, acrylonitrile resin, and ethylene / vinyl alcohol copolymer.

As a method for producing the heat seal layer 6, there are a method of applying a hot-melt adhesive or a sealant to the base material layer 5 by T-die melt extrusion and coating, and a method of dry-laminating a sealant film.

The pressure-sensitive adhesive in the present invention must have removability. That is, at the stage of distribution in the market, the lid is heat-sealed to the cup-shaped container 7 with a sufficient adhesive force, and the cover layer 2 and the base material layer 5 are also sufficiently bonded to eat and drink food. When pouring hot water at the time of cooking instant foods, the coating layer 2 can be peeled off from the base layer 5 by pinching it with a finger, and an entrance is formed. When the noodles are steamed during cooking of food, the coating layer 2 can be re-adhered to the base layer 5, and the lid 1 can be peeled off from the cup-shaped container 7 when eating and drinking after cooking. The adhesive needs to have removability.

The material of the pressure-sensitive adhesive in the present invention is not particularly limited. For example, a natural rubber-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, or the like is used as an elastomer component. If necessary, a softening agent, an antioxidant and the like are appropriately added. In order to have removability as an adhesive in the present invention, for example,
An adhesive containing a crosslinking agent such as a phenol resin, a polyfunctional isocyanate compound, a sulfur compound, a peroxide, a metal oxide, a methylol resin, a polyfunctional amine compound, and an organometallic compound is used. The addition of the crosslinking agent is also favorable in that it has heat resistance to withstand heat when the lid material 1 is heat-sealed to the cup-shaped container 7 and weather resistance in consideration of a period from production to use by a customer. It is. Since it is used for foods, it is preferable that it is non-toxic and has little aroma.

The adhesive has an adhesive strength of 100 to 300 g / c.
m, the peeling force of the coating layer 2 from the base material layer 5 is lower than the heat sealing strength, and is 30 times including the non-application / application of the release agent.
The range of １００100 g / cm is good.

By subjecting the adhesive-coated surface of the coating layer 2 to a corona treatment and a primer treatment in advance, the adhesion of the adhesive is firmly applied.

The amount of the adhesive to be applied varies depending on the kind of the adhesive, but is preferably 10 to 50 g / m ² ,
-40 g / m ² is more preferred.

As the release agent, a long-chain alkyl group-containing compound or a general-purpose addition type or condensation type silicone release agent is used. Specifically, on the other hand, Piroyl 1020 manufactured by YAS Co., Ltd., RP-20 manufactured by Nippon Shokubai Co., Ltd. and the like can be mentioned. The coating amount of the release agent layer 4 after drying is 0.1 to 2.0 g /
m ² is preferred, and 0.2 to 1.0 g / m ² is more preferred. When the coating amount is less than 0.1 g / m ² , uniform release performance between the pressure-sensitive adhesive of the coating layer 2 and the release surface of the base layer 5 cannot be obtained, and heavy release easily occurs at a high temperature, while 2.0 g is used. / exceeds m ² when partially unfavorable may interlayer cracking.

As the silicone release agent, an addition type silicone release agent having high reactivity is particularly preferably used. Specifically, BY24-162 and SD-7234 manufactured by Dow Corning Toray Silicone Co., Ltd., and KS-3600, KS-774, and X62 manufactured by Shin-Etsu Chemical Co., Ltd.
-2600 and the like.

Further, in order to enable an appropriate release property, the silicone-based release agent contains SiO ₂ units and (CH ₃ ) _3.
SiO _1/2 unit or CH ₂ ＣＨCH (CH ₃ ) ₂ S
It is characterized by containing a silicone resin which is an organosilicon compound having iO _1/2 unit. Specifically, BY24-84 manufactured by Dow Corning Toray Silicone Co., Ltd.
3, SD-7292, SHR-1404 and the like, KS-3800 and X92-183 manufactured by Shin-Etsu Chemical Co., Ltd., and the like.

The amount of the silicone resin used is 35 to 80% by weight based on the silicone release agent. Three
If the amount is less than 5% by weight, the peeling force of the pressure-sensitive adhesive layer from the silicone-based release agent layer 4 becomes too low, which is not preferable. 8
If the content exceeds 0% by weight, the curability of the silicone will be reduced, and at the same time, the peeling force from the pressure-sensitive adhesive layer 3 will be too high.
It is not preferable because the peelability of the coating layer 2 from the film becomes poor.

In the present invention, a platinum catalyst is preferably used as a catalyst for curing the silicone-based release agent, although not particularly limited, and specifically, SRX- manufactured by Dow Corning Toray Silicone Co., Ltd. 212, FL-50T manufactured by Shin-Etsu Chemical Co., Ltd., and the like. Further, an adhesion improver may be used to improve the adhesion between the silicone-based release agent and the substrate, and for example, a metal-based chelate, a silane coupling agent, or the like is added. Specifically, Toray
Dow Corning Silicone SD-7200, BY
24-846A, BY24-846C and the like.

The silicone release agent is, for example, toluene,
It is dissolved in a single or mixed organic solvent such as n-hexane, cyclohexane, and isopropyl alcohol (IPA) and applied and dried. The applied amount of the release agent layer 4 after drying is 0.
05-2.0 g / m ² , preferably 0.1-1.5 g / m ²
m ² is more preferred. Is less than 0.05 g / m ² not obtained homogeneous peeling of the release surface and the pressure sensitive adhesive, may be partially interlayer cracking and heavy exfoliating, silicone exceeds other 2.0 g / m ² It is not preferable because the curability deteriorates.

Further, the lid 11 is filled with the contents in the cup-shaped container 17 and then the opening flange 19 of the cup-shaped container 17 is opened.
However, due to the heat history at the time of the heat sealing, an appropriate peelability may not be obtained due to an increase in the peeling force when the cover layer 12 is opened from the base material layer 15.

In order to cope with this drawback, the cover 11
The cover layer 1 includes a re-peelable pressure-sensitive adhesive layer 13 along the inside of the seal portion of the opening flange 19 of the cup-shaped container 17.
A notch 21 is formed in 2 to form a knob piece 20. When the lid 11 is opened by having such a structure, when the knob 20 is pulled, the portion where the peeling force is increased by heat sealing remains in the state of being adhered to the base layer 15. It can be opened with a peeling force, and at the time of opening, heavy peeling prevents the contents from jumping out due to excessive force.

In addition to opening the doorway by peeling off the coating layer 32, the method also requires temporary resealability when the lid material 31 is peeled from the cup-shaped container 37 and the opening is greatly opened. There is also. The lid member 31 is provided with the knob piece 30.
Is sufficiently protruded from the sealing portion of the opening flange 39, and a cut 41 is formed in the base material layer 35 including the heat sealing layer 36 along the opening flange 39 inside the knob piece 30. , The base material layer 35 of the knob piece 30
By peeling off the part, the adhesive surface is exposed, and the knob piece 30 is temporarily attached to the main body of the cup-shaped container 37, so that the opened lid material 31 is hard to curl, and the end of the opened lid material 31 is hardly curled. Can be resealed without floating.

[0031]

Embodiment 1 A polyethylene terephthalate (PET) film (thickness, 38
μ) was used. A linear low-density polyethylene resin (LLDPE) with a metallocene catalyst having a lamination thickness of 30
After hot-melt extrusion lamination with μ, an additional silicone release agent (BY2
4-162, manufactured by Dow Corning Toray Silicone Co., Ltd.)
A resin containing 50% of a silicone resin (BY24-843, manufactured by Dow Corning Toray Silicone Co., Ltd.) was applied to a dry coating thickness of 0.7 g / m ² .
Next, an acrylic pressure-sensitive adhesive containing 2% of a cross-linking agent (polyfunctional isocyanate compound) was applied to the release agent layer and dried so as to have a coating thickness of 20 μm. The raw material for the cover material was obtained by winding the film in a roll while adhering the surfaces of the pressure-sensitive adhesive layers. The raw material was cut into the shape of an opening flange of the cup-shaped container 7 while making cuts 8 so as to form an entrance for food and drink, thereby producing the lid material 1. The peeling force between the base material layer 5 and the coating layer 2 is 80 g.
/ Cm.

[0032]

According to the present invention, a cup-shaped container having a layer structure composed of the coating layer 2 and the base material layer 5 is provided with a cut 8 formed in a shape corresponding to the entrance so as to form an entrance for food when the coating layer 2 is peeled off. In the lid material 1 for 7, the cover layer 2 can be temporarily opened and resealed from the base material layer 5 at the time of drinking or cooking, but a proper opening property at the time of opening is considered. Has not been made.

The surface of the pressure-sensitive adhesive layer 3 of the coating layer 2 made of a plastic provided with a removable pressure-sensitive adhesive layer 3 or a plastic including a paper layer, a release agent layer 4 on one surface, and heat sealing on the other surface. It has a layer structure in which the surface of the release agent layer 4 of the base material layer 5 provided with the layer 6 is adhered. In the present invention, a sufficient opening property when the cover layer 2 is opened from the base material layer 5 is sufficient. Lid material 1 having excellent resealability was obtained. In addition, the method using aluminum foil has problems such as inconsistency with recent natural environmental measures and waste measures, and there is a demand for improvement.However, except for cases where light shielding properties and oxygen barrier properties are particularly required, this method must be used. In the present invention, it has become possible to remove the aluminum foil from the layer structure of the lid 1.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a cup-shaped container is sealed with a lid material of the present invention.

FIG. 2 is a sectional view showing a state in which a cup-shaped container is sealed with another lid material of the present invention.

FIG. 3 is a top view of the lid member of FIG. 2;

FIG. 4 is a sectional view of the lid member of FIG. 2;

FIG. 5 is a cross-sectional view showing a state in which the cup-shaped container is resealed with another lid material of the present invention.

FIG. 6 is a cross-sectional view of the lid member of FIG.

FIG. 7 is a top view of the lid member of FIG. 5; 1, 11, 31 ... lid material, 2, 12, 32 ... coating layer, 3, 13, 33 ... adhesive layer, 4, 14, 34 ... release agent layer, 5, 15, 35 ... base material layer, 6, 16, 36: heat sealing layer, 7, 17, 37: cup-shaped container, 8, 18, 38: cut notch corresponding to entrance and exit 9, 19, 39 ... opening flange 20, 30, ... knob piece 21 ... opening Cut along the inside of the flange seal part 41 Cut

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[Procedure amendment]

[Submission date] February 17, 2000 (2000.2.1
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 6

FIG. 5

FIG. 7

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hiroki Mochizuki 2-3 Term, Odenmacho, Nihonbashi, Chuo-ku, Tokyo Oji Chemical Co., Ltd. F term (reference) 3E067 AA01 AB01 AC01 BA02A BB14A BB15A BB16A BB25A BC03A CA24 EA06 EA35 EB11 FA01 FB01 FC01 GD06 GD08

Claims (4)

[Claims] 1. A pressure-sensitive adhesive layer of a coating layer made of a plastic having a removable pressure-sensitive adhesive layer or a plastic containing a paper layer, a release agent layer on one surface, and a heat seal layer on the other surface. The release agent layer of the provided base material layer has a layer structure in which the surface of the release agent layer is bonded to the base material layer, including the heat seal layer. A lid member for performing heat sealing and sealing by applying the heat sealing layer to an opening flange of a cup-shaped container provided with a cut. 2. An opening / closing portion having a knob is formed by making a cut in a coating layer including a removable adhesive layer along an inner side of an opening flange seal portion of a cup-shaped container. Lid material. 3. A knob piece is protruded sufficiently from an opening flange portion, and a heat seal layer is included inside the knob piece except for a portion serving as a knob of the base material layer along the opening flange. 3. The cover material according to claim 1, wherein a cut is made in the base material layer. 4. JIS Z 023 from the base material layer of the coating layer
4. The lid material according to claim 1, wherein a peeling force based on No. 7 is in a range of 20 to 100 g / cm.