JP3644871B2 - Container with easy peel laminated film lid and lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a container with a laminated film lid material formed by heat-sealing a laminated film lid material on a flange portion of a container having an upper opening, has a gas barrier property, and has a sealing portion at the time of opening. The present invention relates to the structure of a new type synthetic resin-made container with a laminated film lid material which has an easy peel property due to interfacial peeling when peeled off and removed from the container and has a structure in which the film lid material does not tear.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a container in which a laminated film lid is covered on a flange portion of a container is used as a container for storing solid curry wax and the like. This type of container structure includes a bottom wall, a peripheral wall erected around the bottom wall, an upper opening, a container body including a flange extending horizontally from the upper edge of the peripheral wall, and a laminated film lid And a laminated film lid material is heat-sealed on the flange portion of the container body, and the lid is applied to the upper opening of the container.
[0003]
In general, as a cover material used for this type of container, a multilayer film cover material laminated in multiple layers has been developed, and various types are used.
For example, when manufacturing a product that contains the contents such as solid curry wax in a container and covers and seals the lid, stable sealing strength can be obtained, especially as a problem in product manufacturing technology, safety No sanitary problems, high strength as a packaging bag, no bag breaking during product distribution, lid material is moldable, heat-resistant, shape-retaining, gas barrier, heat-sealable, manufactured Excellent film properties, compatibility with container materials and conditions of use, no cost increase, easy use as a problem in product use, easy openability (easy peelability) For example, the lid material can be easily opened by a single operation without tearing at the time of opening, and the sealant of the lid material does not remain on the flange portion of the container.
[0004]
As various products are marketed and their packaging purposes and uses are diversified, various composite film lids with the above properties have been proposed. As competition for development and product price reduction intensifies, the development of a new type of sealant film that satisfies high cost with high quality and high performance is becoming an important issue. In addition, among the characteristics required for such a lid material in order to increase the commercial value, in particular, easy-openability is an important function that affects convenience during use of the product, and has excellent openability. It can be said that the product value of the product can be increased and it can be a positive factor in differentiation from other products.
However, easy-openability is a function that is contrary to the seal-sealing property, which is the original technical purpose of the lid. In fact, a packaging container that can provide stable seal strength and has excellent easy-openability can be obtained. It is never easy to maintain high quality and manufacture at low cost.
[0005]
In other words, various composite films aimed at easy opening have been developed in the past, but these products are agglomerated to peel between the container and the sealant layer of the composite film because of the need to ensure the sealing strength. Most of them are destructive (peeling) type film cover materials. That is, in these products, rather than the breaking strength of the sealant layer of the composite film lid material, the sealing strength by the sealant layer contacting the flange portion of the container, the breaking strength of the material of each layer of the composite film lid material, and the laminate between the layers Strengthen the strength (lamination strength) and give priority to the destruction of the sealant layer of the composite film lid material, that is, make the adhesive strength between the base material of the lid material and the sealant layer stronger than the seal strength with the container, or By making the cohesive strength of the resin of the sealant weaker than the cohesive strength of the other layers and the adhesive strength between the layers, a stable seal strength and easy-openability are balanced. Therefore, in these products, if the lid of the container is peeled off by hand at the time of opening, the sealant of the lid remains on the flange part of the container due to the destruction of the sealant of the lid. There is a possibility that problems in safety and food hygiene may remain due to the possibility of contamination in food.
[0006]
In order to avoid such a problem, an interfacial delamination method is also considered, in which a fused portion and a non-fused portion are formed microscopically at the seal interface between the lid and the container so as to peel at the seal interface. However, for this purpose, it is necessary to use a composite film of a special material and structure because it is necessary to secure a stable sealing performance and to realize easy opening. In most cases, application to actual products is difficult in terms of cost. Therefore, the quality performance of the composite film made of the above-mentioned special materials and structures is maintained, and yet a new type that can be reduced in cost. There has been a strong demand for the development of a container with an easily openable lid by interfacial peeling.
[0007]
[Problems to be solved by the invention]
Under such circumstances, the present inventors have realized a low-cost interface-peeled container having a stable sealing strength and an easy-opening property in view of the prior art. As a result of intensive research with the goal of developing a new type of lidded container structure, the seal strength at the seal interface between the container and the lid and the laminar strength between the interlayers were adjusted. It has been found that the intended purpose can be achieved by employing a sealant layer and an intermediate layer of a specific material and structure, and the present invention has been completed.
[0008]
The present invention has a stable seal strength, and when opened, the seal interface between the container and the cover material is peeled off, and the interlayer between the cover material and the sealant layer is peeled off, so that the cover material does not tear. An object of the present invention is to provide a structure of the interface-detached container with a lid material.
In addition, the present invention makes it easy to peel by interfacial peeling at the time of opening, and at the same time when the tearing runs from the base material and the lid material is about to tear, the intermediate layer part is delaminated to prevent the lid material from being torn An object of the present invention is to provide a structure of a container with a lid material.
In addition, the present invention prevents the tearing of the lid material by causing the interfacial delamination at the seal interface between the container and the lid material and the delamination between the intermediate layers to occur cooperatively at a certain time lag at the time of opening. The object of the present invention is to provide a structure of a container with a lid provided with easy peel properties.
Another object of the present invention is to provide an easy peel laminated film lid material used for constructing a container having the above structure.
[0009]
[Means for Solving the Problems]
The present invention for solving the above problems comprises the following means.
(1) A structure of a container with an easily openable laminated film lid, wherein the laminated film lid is made of a polypropylene-polyethylene blend polymer alloy in contact with a heat sealing surface with the container; A support layer (b) for bonding to and supporting the sealant layer (a), which is made of a resin that does not take the form of a polymer alloy mainly composed of a polypropylene resin, the support layer (b), and a base material And an intermediate layer (c) for bonding the layer (d) together as a constituent element, the interfacial peelability on the heat seal surface between the polypropylene-polyethylene blend polymer alloy of the sealant layer (a) and the container and the intermediate adjust one or more lamination strength between the layers of the upper and lower layers adjacent to the layer a layer and between the intermediate layer of layers constituting the (c) (c) is laminated, upon opening, ) Occurs boundary separation from the sealing surface between the container and the sealant layer (b), peeling the seal interface between the container and the lid, then the interlayer cooperating dynamically intermediate layer bonded to the substrate and the sealant layer detached, 2) adjacent to the case where tear the base layer (d) in the peeling portion was almost torn lid running, an interlayer and an intermediate layer of layers constituting the intermediate layer (c) and (c) The structure of the container with the easy peel laminated film lid material, wherein the tear is absorbed by one or more delaminations between the upper and lower layers to prevent the film lid material from being torn .
(2) The container with a lid according to (1), wherein the sealant layer (A) and the support layer (B) have a thickness of 10 to 20 μm.
(3) An intermediate layer in which the laminated film cover material comprises a sealant layer (a), a support layer (b), and a printed layer / adhesive layer for bonding the support layer (b) and the base material layer (d). (C) and a base material layer (d), The container with a lid material according to (1) above.
(4) The lidded container according to (1), wherein the support layer (b) is a polypropylene-polyethylene blend polymer.
(5) The intermediate layer (c) is a polyethylene resin, and the base material layer (d) is polyester, polypropylene, polyethylene, polycarbonate, polyamide, aluminum foil, a single piece of paper, or a composite material of two or more thereof. The container with a lid material according to (1).
(6) The container with a lid according to (1), wherein the container is provided with a flange portion made of polypropylene at an upper portion serving as a heat sealing surface.
(7) An easy-peel laminated film lid used for constituting the lidded container according to any one of (1) to (6), wherein the polypropylene is in contact with a heat sealing surface with the container -Support for bonding and supporting the sealant layer (a) made of polyethylene blend polymer alloy and the above-mentioned sealant layer (a) made of a polymer alloy mainly composed of polypropylene resin. A laminated film cover material comprising a layer (b) and an intermediate layer (c) for bonding the support layer (b) and the base material layer (d) as constituent elements.
(8) A step of filling a container having a polyethylene flange with a heat seal surface on top, interfacial delamination on the heat seal surface of the sealant layer (a) and delamination between layers of the intermediate layer (c) A method for producing the container with a laminated film cover material by a step of heat-sealing the flange portion of the container and the laminated film cover material under the conditions of seal strength / lamination strength that occurs at a constant time lag.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in more detail.
In the structure of the container with a lid according to the present invention, the container is sealed by a heat seal to the container body of the upper opening provided with the flange portion extending in the horizontal direction from the upper end edge of the peripheral wall, and the flange portion of the container. It consists of a cover material, and the cover material comprises a sealant layer (A), a support layer (B) that supports the sealant layer, and a base material (D) and a support layer (B) that are bonded and bonded together. An intermediate layer (c) consisting of layers is prepared, and the sealant layer (a) is adjusted by adjusting the interfacial peelability of the polypropylene-polyethylene blend polymer alloy and the laminar strength between layers of the intermediate layer (c). Occasionally, 1) Interfacial peeling occurs from the sealing surface between the container and the sealant layer (a), and 2) When the base material layer (d) is torn at the peeling part, the interlayer peeling of the intermediate layer (c) The structure where By, it has a maximum point, characterized in that so as to prevent the film lid tearing.
[0011]
In the present invention, first, a combination of a specific interfacial peelable sealant layer (A) and a support layer (B) is a point.
By adopting a polypropylene-polyethylene blend polymer alloy as the sealant layer (a), it is possible to achieve proper interfacial peeling. On the other hand, for example, when the sealant layer (a) is a thin layer, the strength of the polymer alloy is not sufficient, and there is a problem that it cannot be broken or cannot be stably peeled off at the interface. In the present invention, the above-mentioned problem is solved by adhering a support layer (b) made of a resin mainly composed of a polypropylene resin to a sealant layer (b), which does not take the form of a polymer alloy. Thus, the strength of the sealant and stable interfacial peelability can be achieved.
[0012]
Here, the polymer alloy will be described. The polymer alloy means a so-called sea-island structure having a multilayer structure in which a small amount of components are dispersed in an island shape in the matrix polymer sea. The blend ratio of polypropylene and polyethylene is desirably such that polyethylene exceeds 80% by weight, and most preferably 85-90%. Although the remainder is polypropylene, it is possible to adjust the heat sealability by adding an elastomer or the like up to about 5%. As a result, an easy peel can be stably achieved by interfacial peeling. It is important that the blend ratio of the polypropylene-polyethylene blend polymer alloy is determined in combination with the laminar strength between the interlayers (c).
[0013]
Due to the above-mentioned synergistic effect of the combination of the sealant layer (a) and the support layer (b), sufficient film strength and sealing strength can be achieved even when the thickness of both layers is 10 to 20 μm and a stable interface. It becomes possible to obtain peelability, which is advantageous in terms of cost.
Further, the intermediate layer (c) and the base material layer (d) are bonded to the support layer (b), that is, the sealant layer (a) and the base material layer (d) having barrier properties and strength, It is possible to supply an easy peel packaging laminated film material for various uses by laminating with an intermediate layer (c) with a required strength. As a result, it is possible to provide a container with a lid material to which gas barrier properties, heat resistance, moisture permeability, and the like are imparted.
[0014]
In the present invention, as the material of the sealant layer (A) and the support layer (B), the material of the other layers is arbitrary and is not particularly limited as long as the above configuration is satisfied. It is preferable to employ a polypropylene-polyethylene mixture as the support layer (b) because the compatibility and adhesion with the sealant layer (b) or the intermediate layer (c) are improved.
Moreover, it is preferable to use a polyethylene-based resin as the intermediate layer (c) because the compatibility and adhesiveness with the support layer (b) and the base material layer (d) are improved. As the base material layer (d), it is possible to employ polyester such as polyethylene terephthalate, polypropylene, polyethylene, polycarbonate, polyamide, aluminum foil, a simple substance of paper, or a composite material of two or more of these. A material obtained by vapor-depositing aluminum or aluminum oxide (alumina) on a resin can also be used. In particular, polyester, particularly polyethylene terephthalate is preferable, and the above-described vapor deposition resin is preferable. By appropriately selecting these materials, it is possible to impart strength, gas barrier properties, heat resistance and moisture resistance according to the purpose and application.
[0015]
Next, the film sealing method and the thickness of each film will be described. The sealing method is not particularly limited as long as it is a method for heat-sealing the container and the lid. The thickness of the film is preferably 5 to 30 μm for the sealant layer (b), 5 to 30 μm for the support layer (b), 10 to 30 μm for the intermediate layer (c), and 12 to 50 μm for the substrate layer (d). is there. The container includes a flange having at least an upper portion serving as a heat sealing surface made of polypropylene, and can be formed into an arbitrary shape using an arbitrary material and a sheet material having a laminated structure as long as this is satisfied.
Moreover, about the heat seal to a container flange part, 140-145 degreeC is suitable for sealing temperature.
Adjustment of the laminate strength between the layers of the intermediate layer (c) makes the laminate strength between the intermediate layer (c) and the adjacent film layer weaker than that of the other layers, so that the sealant layer (i.e. ) May be appropriately performed so that delamination occurs between the layers of the intermediate layer (c) in cooperation with the interfacial delamination. The portion having a weak laminate strength may be provided between the upper and lower film layers adjacent to the intermediate layer (c), or may be provided on both the upper and lower sides. It is preferable to provide between the layers (c).
[0016]
In order to form the weak part of the laminate strength of the intermediate layer (c), it may be appropriately carried out by selecting the material of each layer including the adhesive, selecting the conditions for laminating each layer by various laminating methods, and the like. In this case, a printing layer (e) coated with an anchor coat or the like is provided between the base material layer (d) and the intermediate layer (c) with the coated surface facing the intermediate layer (c), It is also possible to appropriately form a portion having a weak laminate strength between (e) and the intermediate layer (c).
With the above configuration, when the sealant is opened, the sealant layer (A) surely causes interfacial peeling with respect to the polypropylene container, thereby achieving easy peel properties. In this case, the support layer (b) supports the sealant layer (b), or further enhances the bondability with the upper intermediate layer (c), etc., thereby maintaining the strength of the entire film material and interfacial peeling due to this. (Easy peel) can be stabilized and made uniform, and the film material can be prevented from tearing. Further, an appropriate base material layer can be attached to achieve an appropriate gas barrier property.
[0017]
[Action]
Conventionally, various easy-open laminated film lid materials have been developed. As the sealant layer and the support layer, a specific polypropylene-polyethylene blend polymer alloy / polypropylene and polyethylene mixture is used to cause interfacial peeling. Then, no point has been reported so far about delamination between the intermediate layers with a certain time lag. Thus, in the present invention, a specific material, that is, a blend polymer alloy of polypropylene-polyethylene is used for the former, and a mixture of polypropylene and polyethylene is used for the latter, for the sealant layer and the support layer at the seal interface between the container and the lid. Regardless of the thin film, it achieves a stable seal strength, and when opening, the sealant layer peels easily due to interfacial peeling, and at the same time, tearing from the base material causes the lid to be torn, Since the laminar strength between the intermediate layers is weak, delamination occurs at this portion, the breaking force is dispersed and absorbed, and the total breaking is prevented and a stable and uniform easy peel is achieved.
[0018]
In particular, the present invention uses a specific polypropylene-polyethylene blend polymer alloy and a mixture of polypropylene and polyethylene for the sealant layer at the seal interface between the container and the lid and the support layer, and the seal strength of the sealant layer is intermediate. It is important to adjust the laminar strength between the layers, and it is not possible to achieve a stable and uniform easy peel property simply by specifying the material of the sealant layer as a polymer alloy. As described above, the present invention not only identifies the material of the sealant layer and the support layer, but also adjusts the seal strength at the seal interface and the laminar strength between the interlayers so that the interface peeling at the seal interface and the intermediate layer It is characterized in that the delamination occurs at a constant time lag, thereby making it possible to prevent the lid material from being torn and to obtain a stable and uniform easy peel property.
[0019]
【Example】
Next, the present invention will be specifically described based on examples.
Example A blend polymer alloy containing polypropylene and polyethylene (Mitsubishi Chemical Corporation: trade name “VMX”) and a mixture of 70% polypropylene random copolymer and 30% polyethylene were bonded together by a coextrusion method to form a film. Further, polyethylene terephthalate vapor-deposited with alumina and a printing layer were stacked on the polypropylene mixture side of the above film, and an anchor coat applied on the printing layer side was bonded together with molten polyethylene to produce a film lid.
[0020]
The obtained film material was made of the above-mentioned polypropylene-polyethylene blend polymer alloy (sealant layer (I)) 15 μm, polypropylene mixture (support layer (B)) 15 μm, polyethylene (intermediate layer (C)) 25 μm, printing layer ( E) (the thickness is included in the thickness of the base material layer (d)) and polyethylene terephthalate (base material layer (d)) having a laminated structure of 16 μm.
This was covered with a flange part of a polypropylene tray container filled with Carreau by a conventional method as a film lid, and heat sealed at 145 ° C., 3 kg / cm ² for 1 second.
In this container with a lid material, the sealing strength of each layer constituting the lid material was as follows.
A: Sealing strength between container flange and sealant layer (A) 6N
B: Seal strength between intermediate layer (c) and base material layer (d) 1.5N
The film lid has a gas barrier property, has an easy peel property due to interfacial peeling when the seal is peeled off and removed from the container at the time of opening, and has a good performance that does not tear the film lid. It was.
[0021]
【The invention's effect】
As described above in detail, the present invention is a structure of an easily openable container with a laminated film lid material, and the laminated film lid material is made of a polypropylene-polyethylene blend polymer alloy that comes into contact with a heat seal surface with the container. A sealant layer (b), a support layer (b) made of a resin that does not take the form of a polymer alloy mainly composed of a polypropylene resin, and bonded to and supports the sealant layer (b), and the support An intermediate layer (c) for bonding the layer (b) and the base material layer (d) as a constituent element, the interfacial peelability of the polypropylene-polyethylene blend polymer alloy of the sealant layer (a) and the intermediate 1) Interfacial peeling occurs from the sealing surface between the container and the sealant layer (a) at the time of opening by adjusting the laminate strength between layers of layer (c). 2) Peeling part In the case where tearing occurs in the base material layer (d) in the above, the tearing is absorbed by delamination of the intermediate layer (c) to prevent the film lid material from being torn. According to the structure of the container with the easy peel laminated film lid material, according to the present invention, 1) it has a stable sealing strength, and the seal interface between the container and the lid material peels off at the time of opening. It is possible to provide a structure of an interface peeling type container with a lid material in which an interlayer between a lid material and a sealant layer is peeled off. 2) Easy peeling by interface peeling at the time of opening, When the cover material is torn and the cover material is about to be torn, the intermediate layer part is delaminated to provide a structure of the container with the cover material to prevent the cover material from being torn. 3) Opening Sometimes the seal interface between the container and the lid Providing a lidded container structure that prevents lid tearing and provides easy peelability by allowing surface peeling and interlayer peeling to occur synergistically with a certain time lag. 4) Interfacial debonding occurs at the seal interface at the time of opening, then delamination between the intermediate layers occurs with a certain time lag, and as a whole, the lid material is prevented from being torn and stable and uniform easy peel The effect of being able to provide the structure of the container with a lid | cover material which can achieve property is show | played.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a lid in the structure of a container with a lid according to the present invention.

Claims (7)

A structure of an easily openable container with a laminated film lid, wherein the laminated film lid is made of a polypropylene-polyethylene blend polymer alloy in contact with a heat sealing surface of the container and a polypropylene resin. A support layer (b) made of a resin that does not take the form of a polymer alloy mainly composed of the above, and a support layer (b) that is bonded to and supports the sealant layer (a), and the support layer (b) and the substrate layer (d) And an intermediate layer (c) for laminating the sealant layer (b) as a constituent element, the interfacial peelability of the above-mentioned sealant layer (b) between the polypropylene-polyethylene blend polymer alloy and the container on the heat-sealing surface, ) to adjacent layers and the intermediate layer of the layer and (c) forming one or more laminate strength between the layers of the upper and lower layers were laminated by adjusting, upon opening, 1) volume And it occurs interfacial peeling from the sealing surface between the sealant layer (a), the seal interface is separated in the container and the lid member, and then, together dynamically layers of intermediate layer bonded to the substrate and the sealant layer is peeled off , 2) when the lid running tear the base layer (d) in the peeling portion is about to tear is adjacent to the intermediate layer (c) constituting the layer interlayer and intermediate layer (c) upper and lower A structure of a container with an easy peel laminated film lid material, wherein the tear is absorbed by one or more delaminations between the layers and the film lid material is prevented from tearing.   The container with a lid according to claim 1, wherein the thickness of the sealant layer (A) and the support layer (B) is 10 to 20 μm.   The laminated film lid material is a sealant layer (b), a support layer (b), and an intermediate layer (c) comprising a printed layer / adhesive layer for bonding the support layer (b) and the base material layer (d). And a base material layer (d). The container with a lid material according to claim 1.   The container with a lid material according to claim 1, wherein the support layer (b) is a polypropylene-polyethylene blend polymer.   The intermediate layer (C) is a polyethylene resin, and the base material layer (D) is polyester, polypropylene, polyethylene, polycarbonate, polyamide, aluminum foil, a single piece of paper, or a composite material of two or more thereof. The container with a cover material as described.   The container with a lid according to claim 1, wherein the container is provided with a flange portion made of polypropylene at an upper portion serving as a heat sealing surface.   An easy-peel laminated film lid used for constituting the container with a lid according to any one of claims 1 to 6, wherein the polypropylene-polyethylene blend polymer alloy is in contact with a heat seal surface with the container. And a support layer (B) for bonding and supporting the sealant layer (A), comprising a resin that does not take the form of a polymer alloy mainly composed of a polypropylene resin. A laminated film lid material comprising an intermediate layer (c) for bonding the support layer (b) and the base material layer (d) as constituent elements.

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