JP2016030334A - Laminate, lid material, distribution packaging container, and distribution package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate having excellent film cut resistance, and a lid material, a distribution packaging container, and a distribution package prepared therewith.SOLUTION: A laminate 10 has a base film layer 1, a laminate adhesive layer 2, a rigid film layer 3, a laminate adhesive layer 4 with gas barrier properties, and a sealant layer 5 which are laminated in the stated order. The laminate adhesive layer 2 has heat resistance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate of resin films, a lid using the laminate, a distribution packaging container provided with the lid, and a distribution packaging body in which the contents of the distribution packaging container are filled, and particularly a laminate excellent in punchability. And its application.

2. Description of the Related Art A distribution package in which contents such as one or more kinds of liquid or paste-like foods are stored in a distribution package container is known. An example of a distribution package is that the contents of the bottom of the distribution package container are filled with contents such as ketchup and sauce, and the lid is folded into a mountain fold along the half-cut portion to form a protrusion on the lid. In addition to forming the opening, the plurality of receiving portions of the bottom material are crushed so as to face each other, so that contents such as ketchup and sauce can be pushed out from the opening formed in the lid material.
In order to prevent the contents of the distribution package from being deteriorated by oxygen in the air, an ethylene-vinyl alcohol copolymer resin layer (hereinafter referred to as “EVOH layer”) having an oxygen barrier property is used as an intermediate layer of the lid. A coextruded composite film in which this EVOH layer, a polystyrene resin layer having a good rigidity, and a polyethylene resin layer having a sealing property are laminated by coextrusion are used.

As an example of the layer structure of the lid of the distribution packaging container using the coextruded composite film, from the outside, a copolymerized polyester resin layer, an adhesive layer, a polystyrene resin layer, an adhesive layer, and an ethylene-vinyl acetate copolymer are used. A coextruded composite film having a structure in which a polymer saponified resin (specifically, EVOH) layer, an adhesive layer, and a polyethylene resin layer are laminated is disclosed (Patent Document 1).
Further, as another example of the layer configuration of the lid of the distribution packaging container, from the outside, a polystyrene resin layer, an adhesive layer, an ethylene-vinyl acetate copolymer saponified resin (specifically, EVOH) layer, A coextruded composite film having a configuration in which an adhesive layer and a polyethylene resin layer are laminated is disclosed (Patent Document 2).

Japanese Patent No. 4571835 Japanese Patent No. 4603309

  However, in Patent Document 1 and Patent Document 2, an ethylene-vinyl acetate copolymer saponified resin (EVOH) layer has no adhesive force with a polyolefin-based resin or polystyrene-based resin layer. In addition, a multilayer structure was formed in which an EVOH layer and the resin layer were laminated via an adhesive resin layer such as an unsaturated carboxylic acid-modified polyolefin. Such a multilayer structure becomes complicated in terms of equipment for coextrusion molding, and there is a risk that variations in the thickness of each layer may increase due to extrusion conditions, use environment conditions, and the like. Furthermore, the increase in the number of layers sometimes causes cost and management problems. In addition, the waste generated at the time of operation adjustment and stoppage of coextrusion molding is difficult to recycle because many kinds of resins derived from the multilayer structure are mixed. Therefore, a lid material having an oxygen barrier property without using an EVOH layer is desired.

  Further, the lid material is formed into a predetermined size by punching a sheet of a laminate having a predetermined resin film layer structure. During the punching process, the base film was stretched, and as a result, punched debris was sometimes generated in the cross section of the punched lid member. The punched residue detracts from the aesthetics when the distribution packaging container or the distribution packaging body is manufactured using the lid material, and can be broken by separation of the residue. Since the distribution package may be mixed in a container containing food before use, generation of waste must be avoided.

  Accordingly, an object of the present invention is to provide a laminate that solves the above-described problems, has an oxygen barrier property, and suppresses the occurrence of punching debris, and a lid member, a distribution packaging container, and a distribution packaging using the same. It is to be.

  The above object is achieved by the present invention described below. That is, the laminate of one aspect of the present invention is formed by laminating a base film layer, a laminate adhesive layer, a rigid film layer, a gas barrier laminate adhesive layer, and a sealant layer in this order. The laminate adhesive layer is characterized by comprising a heat-resistant laminate adhesive.

  Moreover, in the said laminated body, it is preferable that a laminate adhesive layer consists of a 2 liquid reaction hardening type adhesive agent of a polyester urethane type main ingredient and a polyisocyanate type hardening | curing agent. In this case, the NCO group / OH group ratio, which is the molar ratio of the NCO group of the polyisocyanate-based curing agent to the OH group of the polyester urethane-based main agent, is preferably 2 or more. Furthermore, the thickness of the sealant layer is preferably 30 to 50 μm.

Further, a lid for a distribution packaging container according to another aspect of the present invention is a lid for a distribution packaging container using the above laminate, and is formed in a straight line at the center of the surface of the laminate. A half-cut portion made of a cut in depth from the surface of the base film layer of the body to the rigid film layer, and formed across the half-cut portion, and the laminate is partially more than the surface of the base film layer And a protruding portion that protrudes outward.
The distribution packaging container lid member preferably has a plurality of protrusions.

A distribution packaging container according to another aspect of the present invention is a distribution packaging container comprising the above-mentioned distribution packaging container lid and a bottom material heat-sealed in contact with the sealant layer of the distribution packaging container lid. The bottom member has a housing portion and a flange portion that comes into contact with and overlaps the lid member.
Furthermore, the distribution package of another aspect of the present invention is characterized in that the contents are filled in the receiving portion of the bottom material of the distribution packaging container.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the laminated body which has oxygen barrier property and suppressed generation | occurrence | production of punching debris, a lid | cover material using this, a distribution packaging container, and a distribution packaging body.

It is sectional drawing which shows one embodiment of the laminated body of this invention. It is sectional drawing which shows one embodiment of the cover material of this invention. It is sectional drawing which shows one embodiment of the laminated body which comprises the bottom material of the distribution packaging container of this invention. It is an external appearance perspective view which shows one embodiment of the distribution packaging container of this invention.

Next, an embodiment of the invention will be described in detail.
FIG. 1 shows a cross-sectional view of one embodiment of the laminate of the present invention. A laminate 10 shown in FIG. 1 includes a base film layer 1, a laminate adhesive layer 2, a rigid film layer 3, a gas barrier laminate adhesive layer 4 and a sealant layer 5 from the outside. They are stacked in order. The laminate 10 has a base film layer 1 bonded to the surface of the rigid film layer 3 via a laminate adhesive layer 2, and a gas barrier property laminate adhesive layer 4 on the back of the rigid film layer 3. The sealant layer 5 is bonded together. The base film layer 1 can be printed on the back surface. The material of each layer will be described in detail later. As an example, the rigid film layer 3 is a polystyrene resin, a polyester resin, or a polycarbonate resin. The laminate adhesive layer 4 having gas barrier properties is an epoxy resin composition comprising an epoxy resin and an amine curing agent. The sealant layer 5 is a polyethylene resin.

  FIG. 2 is a cross-sectional view showing one embodiment of a lid for a distribution and packaging container according to the present invention, in which a half cut portion is provided. The lid member 20 shown in FIG. 2 has the same laminated structure as the laminated body 10 of FIG. The half cut portion 11 is formed by a cut formed in the thickness direction of the lid material 20 from the surface side of the base film layer 1 of the lid material 20 and extends to the rigid film layer 3.

  FIG. 3 shows a cross-sectional view of one embodiment of a laminate constituting the bottom material which is a member of the distribution packaging container of the present invention. The laminated body 30 shown in FIG. 3 has a layer configuration in which an outer layer 31, an intermediate layer 32 having a barrier property, and a sealant layer 33 are sequentially laminated from the outside. The bottom material is obtained by molding the laminate 30 into a shape having a flange portion that is in contact with and overlapped with the lid member 20 and a plurality of accommodating portions. As shown in FIG. 4, the lid 20 is heat-sealed to the bottom material 40 to constitute the distribution packaging container 50. When the lid member 20 is heat-sealed to the bottom member 40, the sealant layer 33 of the laminate 30 is brought into contact with the sealant layer 5 of the lid member 20.

  FIG. 4 is an external perspective view showing one embodiment of the distribution and packaging container of the present invention. The distribution packaging container 50 shown in FIG. 4 has a lid 20 that is rectangular when viewed from above, and a flange that is the same size as the lid 20 when viewed from above, and has a flange portion that contacts the lid 20. And the bottom material 40 which has two accommodating parts is comprised. The cover member 20 and the bottom member 40 are overlapped with each other at the flange portion and heat sealed to form the joining end portion 14.

  The lid member 20 has a half-cut portion 11 formed to extend linearly from one side of the long side to the other side at the center in the longitudinal direction of the surface. Moreover, it has the protrusion part 13 which is formed across the half cut part 11 and makes the laminated body 10 of the lid | cover material 20 protrude outward from the base film layer 1 of a surface partially. The protrusion 13 is a portion where when the distribution packaging container 50 is folded in a mountain fold along the half cut portion 11 of the lid member 20, the bending stress is concentrated on the protrusion 13 which is an opening portion and is torn and forms an opening. It is. Examples of the shape of the protrusion 13 include a quadrangular pyramid, a dome shape, and a cube. However, the shape may be any shape that can concentrate stress when the lid member 20 is bent, and is not limited to these shapes.

In one embodiment of the distribution package of the present invention, the contents are filled in the accommodating portion formed by the recess 16 of the bottom material 40 of the distribution packaging container 50 shown in FIG. Is hermetically sealed. The distribution package 60 can extrude the contents from the opening in which the lid 20 is folded into a mountain fold along the half-cut portion 11 and an opening is formed in the protrusion 13.
The larger the number of protrusions 13, the larger the amount of content per unit time that flows out from the opening. Therefore, it is preferable that the number of the protrusions 13 of the lid member 20 is plural. But the number of the protrusions 13 should just be at least one, and the number of protrusions is not ask | required.

Hereinafter, each layer which comprises the cover material of this invention is demonstrated in detail.
(Base film layer)
The base film layer 1 in the lid member 20 is a layer disposed on the outside of the lid member 20 and has a role of having printability and print stability and has a function of protecting the rigid film layer 3. If it is a resin film layer, it will not specifically limit. The base film layer 1 includes, for example, an amorphous unstretched polyethylene terephthalate film, a stretched polyethylene terephthalate film, a crystalline polyethylene terephthalate film, a stretched polypropylene film, an unstretched polypropylene film, a polybutylene terephthalate film, a stretched polyamide film, and an unstretched polyamide. A film, a polyethylene naphthalate film, a stretched polystyrene film, or the like can be used.
Among these films, a stretched polyethylene terephthalate film and a stretched polypropylene film are preferable because they are excellent in heat resistance and printability.
The film may be produced by any method such as extrusion film formation, inflation film formation, and coating film.
In addition, it is preferable to give surface treatments, such as a corona treatment, to the adhesive surface of a base film layer.
The thickness is preferably selected from the range of 5 μm to 50 μm, and more preferably 8 μm to 40 μm. If the base film layer 1 exceeds the above range, it is not preferable because it tends to be difficult to adjust the half-cut of the lid. Moreover, since it exists in the tendency which cannot be printed stably as the base film layer 1 is less than said range, it is unpreferable.

(Print layer)
Printing can be performed on the back surface of the base film layer 1 of the lid member 20 to form a printed layer. One or two or more types of normal ink vehicles are the main components, and if necessary, plasticizers, stabilizers, antioxidants, light stabilizers, UV absorbers, curing agents, cross-linking agents, lubricants, electrification Add one or more additives such as inhibitors, fillers, etc., add colorants such as dyes and pigments, and knead well with solvents, diluents, etc. The ink composition is then used, and the ink composition is used, for example, using gravure printing, offset printing, letterpress printing, screen printing, transfer printing, flexographic printing, etc. A desired print pattern composed of characters, figures, symbols, patterns, etc. can be printed on the front surface or the back surface of the material film layer 1 to form such a print layer.

(Laminate adhesive layer)
The laminate adhesive layer 2 of the lid member 20 has a role of bonding the base film layer 1 and the rigid film layer 3 together. In order to distinguish the laminate adhesive layer 2 from the laminate adhesive layer 4 having gas barrier properties which will be described later, the laminate adhesive layer 2 may be referred to as a “first laminate adhesive layer” below. The laminate adhesive layer 2 is an adhesive layer having heat resistance. By using an adhesive layer having heat resistance, it is possible to suppress the occurrence of punching scraps when the lid member 20 is punched out from the sheet of the laminate 10 to a predetermined size. This is because, when the punching die is heated due to frictional heat at the time of punching, and when an adhesive layer having no heat resistance is used for the laminate adhesive layer 2, the laminate adhesive layer 2 is stretched at the time of punching. This is because it is considered that punching waste is generated as a result of not being able to cut well. The adhesive layer having heat resistance is harder than the adhesive layer not having heat resistance, and can be favorably cut by a punching die, thereby suppressing punching debris. Whether or not the adhesive of the laminate adhesive layer 2 has heat resistance can be determined by whether or not the heat resistant temperature is 120 ° C. or higher. Specifically, a polyester urethane-based adhesive used for a retort pouch at 121 ° C. or higher can be used. More specifically, as the laminate adhesive layer 2, a polyester urethane-based adhesive can be used as the main agent, and an isocyanate-based two-component reaction-curable adhesive can be used as the curing agent. In this case, the NCO group / OH group ratio, which is the ratio of the NCO group of the polyisocyanate-based curing agent to the OH group of the polyester urethane-based main agent, is preferably 2 or more.
An example of a method for bonding the base film layer 1 and the rigid film layer 3 is a dry laminating method. The laminate adhesive strength is preferably 4 N / 15 mm width or more.

(Rigid film layer)
The rigid film layer 3 of the lid member 20 is a layer disposed in the middle of the lid member 20 and has a role of imparting rigidity and openability to the lid member 20. As the rigid film layer 3, for example, at least one selected from the group consisting of polystyrene resin (hereinafter also referred to as PS), polycarbonate resin (hereinafter also referred to as PC), and polyethylene terephthalate resin (hereinafter also referred to as PET). It is possible to use a film made of the above materials.
For example, in the case of a polystyrene resin film, as a polystyrene resin constituting the rigid film layer, general-purpose polystyrene (hereinafter also referred to as GPPS), impact-resistant polystyrene (hereinafter also referred to as HIPS), styrene / butadiene block copolymer (butadiene). (Single compound) or a blend thereof. GPPS does not contain a rubber component and has the property of being extremely fragile. On the other hand, since HIPS is blended with a rubber component, it has a property that it is difficult to break. Therefore, by appropriately controlling the blend ratio of GPPS and HIPS, it is possible to adjust the openability generated in the lid material when the package is opened.
In addition, it is preferable to give surface treatments, such as a corona treatment, to the adhesion surface of a rigid film layer.
The thickness of the rigid film layer 3 is preferably selected from a range of 50 μm to 500 μm, more preferably 200 μm to 400 μm. If the thickness of the rigid film layer 3 exceeds the above range, an unnecessarily large force is required for folding when opening the package, which is not preferable because the cost increases. Moreover, when the rigid film layer 3 is less than the above range, when opening the package, good openability cannot be obtained, which is not preferable.

(Laminate adhesive layer with gas barrier properties)
The laminate adhesive layer 4 having a gas barrier property of the lid member 20 has a function of adhering the rigid film layer 3 and the sealant layer 5 and also functions as an oxygen gas barrier layer. By using the laminate adhesive layer 4 having gas barrier properties, an EVOH layer as an oxygen gas barrier layer becomes unnecessary. Therefore, it is possible to eliminate the adverse effects caused by the multi-layering in the case of using the EVOH layer stack as in the prior art.
In order to distinguish the laminate adhesive layer 4 having gas barrier properties from the laminate adhesive layer 2 described above, the laminate adhesive layer 4 may be referred to as a “second laminate adhesive layer” below. The laminate adhesive layer 4 having gas barrier properties needs to be an epoxy resin composition composed of an epoxy resin and an amine curing agent. The epoxy resin may be a saturated or unsaturated aliphatic compound, alicyclic compound, aromatic compound, or heterocyclic compound.

  Specifically, an epoxy resin having a glycidylamino group derived from metaxylylenediamine, an epoxy resin having a glycidylamino group derived from 1,3-bis (aminomethyl) cyclohexane, and a glycidylamino derived from diaminodiphenylmethane Epoxy resin having glycidylamino group or glycidyloxy group derived from paraaminophenol, epoxy resin having glycidyloxy group derived from bisphenol A, epoxy having glycidyloxy group derived from bisphenol F Resins, epoxy resins having a glycidyloxy group derived from phenol novolac, epoxy resins having a glycidyloxy group derived from resorcinol, etc. can be used. Epoxy resin having glycidylamino group derived from xylylenediamine, epoxy resin having glycidylamino group derived from 1,3-bis (aminomethyl) cyclohexane, epoxy resin having glycidyloxy group derived from bisphenol F And epoxy resins having a glycidyloxy group derived from resorcinol are preferred.

Amine-based curing agent is a reaction product of metaxylylenediamine or paraxylylenediamine as a curing agent, and a polyfunctional compound having an acyl group that can form an amide group site by reaction with polyamine to form an oligomer. Or a product of reaction with a monovalent carboxylic acid having 1 to 8 carbon atoms or a derivative thereof.
Polyfunctional compounds having an acyl group that can form an amide group by reaction with this polyamine to form an oligomer include acrylic acid, methacrylic acid, maleic acid, fumaric acid, succinic acid, malic acid, tartaric acid, adipic acid Carboxylic acids such as isophthalic acid, terephthalic acid, pyromellitic acid, trimellitic acid and their derivatives, such as esters, amides, acid anhydrides, acid chlorides, etc., especially acrylic acid, methacrylic acid and their derivatives Is preferred. Examples of the monovalent carboxylic acid having 1 to 8 carbon atoms include formic acid, acetic acid, propionic acid, butyric acid, lactic acid, glycolic acid, benzoic acid and the like, and derivatives thereof such as esters, amides, Acid anhydrides, acid chlorides and the like can also be used.

  As a method of bonding the rigid film layer 3 and the sealant layer 5 using the laminate adhesive layer 4 having gas barrier properties, a dry laminating method can be exemplified. The laminate adhesive strength is preferably 6 N / 15 mm width or more. If the laminate adhesive strength is within the above range, the base film layer 1 and the rigid film layer 3 are cracked, and the sealant layer 5 is then stretched and gradually opened from the central portion, so that only the deformed portion is torn, and the contents Can be discharged, which is preferable. When the lid material is folded and opened when the laminate adhesive strength is less than the above range, the interlayer (laminated surface) between the rigid film layer 3 and the sealant layer 5 is peeled off, and the lid material tends to be unable to open well. It is not preferable. In order to obtain such a laminate adhesive strength, the adhesive layer is preferably 1 μm to 8 μm.

(Sealant layer)
The sealant layer 5 of the lid member 20 needs to be a heat-sealable layer. The sealant layer 5 is made of, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), low density polyethylene and high density polyethylene, which are excellent in heat sealability. Blends, unstretched polypropylene (CPP), random copolymers of propylene and other olefins such as ethylene and butene, and polyolefin resins such as block copolymers are used. In consideration of the low temperature sealing property and peel-opening property (easy peel property), a blend of incompatible components with the polyolefin resin, such as polystyrene or polybuden, can be used for these polyolefin resins.
Especially, the preferable sealant layer 5 is a high density polyethylene (HDPE) or a medium density polyethylene resin (MDPE). In the conventional lid member 20, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or the like is used for the sealant layer 5. It turned out to be not enough. LDPE is fragile and is prone to fluffing and full opening. LLDPE tends to extend, and a film residue is likely to occur as a result of the film not being cut. When the plurality of protrusions 13 are formed on the lid member 20, the film breakage of the sealant layer 5 may not be particularly successful. High-density polyethylene (HDPE) or medium-density polyethylene resin (MDPE) has relatively low heat sealability compared to LDPE and LLDPE, but can be sufficiently heat-sealed and has good film cutting properties. It is.

  When a high density polyethylene resin or a medium density polyethylene resin is used for the sealant layer 5, the density of the resin is in the range of 0.925 to 1.00. 0.925 to less than 0.94 are medium density polyethylene resins, and 0.94 or more are high density polyethylene resins. If it is less than 0.925, the film cutting property is poor, and if it exceeds 1.00, there is a possibility that inconvenience may occur in sealing property and moldability.

  The thickness of the sealant layer 5 is preferably 20 μm or more and 100 μm or less, and more preferably 30 μm or more and 50 μm or less. Within the above-mentioned range, it is preferable because the cutting at the time of opening is good and good sealing properties can be maintained. If the thickness of the sealant layer 5 is less than the above range, it will be difficult to maintain good sealing properties, and if it exceeds the above range, it will be difficult to achieve good cutting at the time of opening the lid material. It is not preferable. In the case of MDPE, 30 to 50 μm, and in the case of HDPE, the heat resistance is high, and if it is too thick, it becomes difficult to form the protrusions 13, so 30 to 40 μm is preferable.

  The laminated body 10 of each layer constituting the lid member 20 described above can be manufactured by a dry lamination method. Further, when the front and back layers are bonded by the dry laminating method, the front and rear resin film layers can be freely selected and bonded. When bonded by the dry laminating method, the adhesive strength between the layers can be maintained at 4 N / 15 mm width or more, so when folding and opening the lid material, each layer is stretched without peeling between the layers, Since it can open gradually, it is preferable.

In addition, for example, the lid member 20 is manufactured by cutting the half-cut portion into the laminate 10 and forming the protrusion 13 toward the outside of the container by thermoforming at a temperature of 170 ° C. to 220 ° C. This can be done by dividing with.
The shape of the protrusion 13 is intended to cause bending stress to concentrate on the opening when the lid member 20 of the distribution packaging container 50 is bent, the opening being torn and the contents popping out. Examples of the shape of the protrusion 13 include a quadrangular pyramid shape, a semicircular shape (dome shape), and a cube. By forming the half-cut portion, the lid member can be easily opened. The half-cut portion is preferably formed to a depth reaching 10% to 90% of the thickness of the rigid film layer 3.
The half-cut portion can be cut by a line continuous in the same direction as the direction in which the lid member 20 is folded. Moreover, you may make a cut into a dotted line shape about 2 mm-10 mm only in the vertex part of the protrusion 13. FIG.

The bottom material 40 has a recess 16 that fills the contents at the center, and the lid 20 and the bottom material 40 are heat-sealed at the peripheral flange portion to form the distribution packaging container 50.
The bottom material 40 is composed of a plurality of resin film layers having moldability. For example, the bottom material 40 has a configuration in which an outer layer 31, an intermediate layer 32 having a barrier property, and a sealant layer 33 are sequentially laminated from the outside.

(Outer layer of bottom material)
As the outer layer 31 having moldability, a resin film that can be thermoformed such as vacuum and pressure forming can be used. For example, polystyrene resin, polycarbonate resin, polyolefin resin such as polyethylene and polypropylene, polyvinyl chloride resin, acrylic or methacrylic resin, acrylonitrile resin, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene A film of a resin such as a copolymer, a polyester resin, a polyamide resin, a polyacetal resin, or the like can be used. The film may be any of an unstretched film and a stretched film. Further, the thickness is preferably 10 μm or more and 300 μm or less, and more preferably 20 μm or more and 150 μm or less.

(Barrier layer of bottom material)
Further, as the intermediate layer 32 having a barrier property, a resin film having a thermoformability such as vacuum / pressure forming, and having a barrier property against gas, water vapor and the like can be used. For example, a resin film such as a polyvinylidene chloride resin, a polyvinyl alcohol resin, a saponified ethylene-vinyl acetate copolymer, a polyacrylonitrile resin, or the like can be used. The thickness is preferably 5 μm or more and 50 μm or less, and more preferably 5 μm or more and 30 μm or less.

(Bottom sealant layer)
Next, as the sealant layer 33 of the bottom material, a resin film having moldability and heat sealability can be used. Resin films that have thermoformability such as vacuum / pressure forming, and that can be melted by heat and thermally fused to each other can be used. As the sealant layer of the bottom material, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid or methacrylic acid Copolymer, ethylene-acrylic acid ester or methacrylic acid ester copolymer, ionomer resin, ethylene-propylene copolymer, acid-modified polyethylene resin or polypropylene resin, polyvinyl acetate resin, 4-methylpentene-1 Resin, polybutene-1 resin, and other resin films can be used. The thickness is preferably 5 μm or more and 300 μm or less, and more preferably 20 μm or more and 150 μm or less.

In addition to the materials listed above, the bottom material 40 is, for example, a film or sheet of other resin that satisfies properties such as light resistance, heat resistance, chemical resistance, oil resistance, hygiene resistance, and the like, Alternatively, a reinforcing resin film or sheet that satisfies the strength, firmness, waist, shape retention, etc. of the container can be selected and used. Cellophane, synthetic paper, etc. Can be used.
For example, as a resin film with formability and printability, it has thermoformability such as vacuum and pressure forming, and can be printed with letters, figures, etc. A resin film which is rich in stability and can be a main material constituting the container can be used instead of the outer layer 31 or between the outer layer 31 and the intermediate layer 32 having a barrier property. Examples of resin films having moldability and printability include polyester resins, polyamide resins, polycarbonate resins, polypropylene resins, polyacetal resins, modified resins of these resins, and films of other resins. Can be used. Thus, the film may be any of unstretched or stretched film, and the thickness is preferably 5 μm or more and 300 μm or less, more preferably 10 μm or more and 150 μm or less. Among these resin films, a polyethylene terephthalate film for molding and a polypropylene film by cast molding are the most desirable materials from the viewpoints of moldability, printability, printing pitch dimension stability, and the like. A printed pattern can be formed on the surface of the resin film by a normal printing method such as gravure printing, offset printing, silk screen printing, or the like.

  A method for manufacturing the laminate for the bottom material 40 by using the materials for the bottom material 40 and laminating them in combination will be described. Examples of such a method include a lamination method for producing a laminate as a normal packaging material, for example, a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die coextrusion lamination method, a coextrusion lamination. Or other methods. In the lamination, for example, an anchor coating agent such as isocyanate (polyurethane), polyethyleneimine, polybutadiene, or organic titanium can be used. Furthermore, lamination adhesives such as polyurethane, polyester, epoxy, polyamide, poly (meth) acrylic, polyvinyl acetate, cellulose, polyacetal, etc. can be used. If necessary, pretreatment such as corona treatment and ozone treatment can be optionally performed.

  The thermoforming method for producing the bottom material 40 by vacuum / compressing the laminate for the bottom material 40 will be described. As the thermoforming method, for example, the laminate produced above is heated and softened, and the process is performed. Examples of the method include a thermoforming method in which the material is pressed against a mold by pressure. Specifically, the laminated body is heated and softened, and then the laminated body is applied to a mold by vacuum forming or pressure forming, and at that time, a resin film having moldability and heat sealability is distributed and packaged. The bottom member 40 can be manufactured by forming the flange member 50 so as to have an inner surface of the cover member 50 and a flange portion that hermetically seals the lid member 20.

  Next, a description will be given of a manufacturing method of the distribution packaging body 60 in which the content of the distribution packaging container 50 composed of the lid material 20 and the bottom material 40 is filled. As such a method, as described above, In addition, for example, sauces, tartar sauce, dressing, jam, mayonnaise, ketchup, knead paste, mustard, sauce, etc. liquid or paste food, cream, milky lotion, skin lotion, shampoo, rinse, conditioner, hair dye Filling with filling contents such as whitening cosmetics, liquids such as cosmetic oils, liquid pharmaceuticals such as ointments, liquid medicines such as ointments, etc., and then covering the flange 20 at the opening of the bottom 40 with the lid 20 Overlap and hermetically seal with heat-sealing surfaces facing each other, then, if necessary, outside the hermetically sealed package And trimming the periphery of the can to produce a dispensing package 60. Further, the liquid or paste-like material may contain a solid material within a range that does not clog the opening of the protrusion 13 when the distribution package 60 is folded and the content is pushed out. It is also possible to manufacture the distribution package 60 by performing molding using a continuous molding machine for both vacuum molding and pressure molding, and then successively filling the contents, hermetically sealing the lid material, trimming, and the like.

  In the distribution package 60 of the present invention, the protrusion 13 opens to form an opening by pinching the both ends in the longitudinal direction with fingers with the half cut portion of the lid member 20 as the center, and forming the opening. It can be pushed out of the dispensing package 60 from the opening.

Next, the present invention will be described more specifically with reference to examples.
As the lid material, a resin film made of the base film layer 1, the laminate adhesive layer 2, the rigid film layer 3, the gas barrier barrier laminate adhesive layer 4, and the sealant layer 5 was prepared and laminated in this order.

The base film layer 1 is a biaxially stretched polypropylene film (manufactured by Santox Co., Ltd.) having a thickness of 25 μm, and a normal gravure ink composition is used on one side thereof. A print layer formed by printing a predetermined print pattern made of a pattern or the like was used.
The laminate adhesive layer 2 is a polyether urethane-polyisocyanate-based adhesive (manufactured by Rock Paint Co., Ltd., trade name: Rockbond J, main agent: RU-40, curing agent: H-4) so that the coating thickness is 3 μm. Formed.
As the rigid film layer 3, a 280 μm-thick polystyrene resin film (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name: Denka styrene sheet) was used.
The laminated adhesive layer 4 having gas barrier properties is made by applying “MAXIVE” manufactured by Mitsubishi Gas Chemical Co., Ltd., main agent M-100: non-bis-A polyepoxy resin, curing agent C-115: polyamine resin) to a coating thickness of 4 μm. Used for.
As the sealant layer 5, HDPE grade, MDPE grade, LDPE grade, and LLDPE grade of polyethylene resin film (product name: Tinlon L, manufactured by Aicello Co., Ltd.) were used.

  A laminate adhesive layer 4 having gas barrier properties was applied to the polystyrene resin film sheet of the rigid film layer 3 so as to have a coating thickness of 4 μm, and was dry-laminated with the polyethylene resin film of the sealant layer 5. Also, the laminated adhesive layer 2 adhesive is applied to the printed biaxially stretched polypropylene film of one layer of the base film so as to have a coating thickness of 3 μm, and the previously laminated polystyrene resin film sheet / sealant laminate and dry laminate Then, a lid material sample was obtained.

Example 1
In Example 1, the laminate adhesive layer 2 is an adhesive having heat resistance, and the sealant layer 5 is an example of MDPE grade.
Layer structure: biaxially oriented polypropylene film layer (25 μm) / polyester urethane-polyisocyanate adhesive layer (3 μm) / polystyrene resin film layer (280 μm) / gas barrier laminate adhesive layer (4 μm) / medium density polyethylene film (40 μm). The NCO group / OH group ratio of the polyester urethane-polyisocyanate adhesive layer as the laminate adhesive layer 2 was 3.

(Example 2)
In Example 2, the laminate adhesive layer 2 is an adhesive having heat resistance, and the sealant layer 5 is an LDPE grade.
Layer structure is biaxially oriented polypropylene film layer (25 μm) / polyester urethane-polyisocyanate adhesive layer (3 μm) / polystyrene resin film layer (280 μm) / gas barrier laminate adhesive layer (4 μm) / low density polyethylene film (50 μm). The NCO group / OH group ratio of the polyester urethane-polyisocyanate adhesive layer as the laminate adhesive layer 2 was 3.

(Comparative Example 1)
In Comparative Example 1, the laminate adhesive layer 2 is an adhesive having no heat resistance, and the sealant layer 5 is an MDPE grade.
The layer structure is biaxially oriented polypropylene film layer (25 μm) / polyether urethane-polyisocyanate adhesive layer (3 μm) / polystyrene resin film layer (280 μm) / gas barrier laminate adhesive layer (4 μm) / medium density polyethylene. It was a film (50 μm).

(Comparative Example 2)
In Comparative Example 2, the laminate adhesive layer 2 is an adhesive having a low heat resistance (heat resistant temperature of 100 to 120 ° C.), and the sealant layer 5 is an MDPE grade.
The layer structure is a biaxially oriented polypropylene film layer (25 μm) / polyester-polyisocyanate adhesive layer (3 μm) / polystyrene resin film layer (280 μm) / gas barrier laminate adhesive layer (4 μm) / medium density polyethylene film ( 50 μm).

(Comparative Example 3)
Comparative Example 3 is an example of a conventional lid material.
According to the co-extrusion molding method, the layer constitution was as follows: polystyrene resin layer (20 μm) / polystyrene resin layer (245 μm) / adhesive resin layer / ethylene-vinyl alcohol copolymer (4 μm) / adhesive resin layer / low density polyethylene resin layer (25 μm). ) Was obtained.
On the other hand, a biaxially stretched polyethylene terephthalate resin film with a thickness of 25 μm is used as the base film layer, and a normal gravure ink composition is used on one side of the film, and a printing pattern is printed by a gravure printing method. Formed.
Next, a polyester urethane-polyisocyanate adhesive (manufactured by Rock Paint Co., Ltd., trade name: Rockbond J, main agent: RU-40, curing agent: H-4) is applied to the printing surface of the gravure-printed base film layer. The coated film is formed to have a coating thickness of 3 μm, and then the surface of the laminating adhesive layer is overlaid with the polystyrene resin surface of the laminated film by co-extrusion facing each other. A sample was laminated.
Layer structure is biaxially stretched polyethylene terephthalate resin film layer (25 μm) / printing layer / urethane laminate adhesive layer (3 μm) / polystyrene resin layer (20 μm) / polystyrene resin layer (245 μm) / unsaturated carboxylic acid modified polyolefin Adhesive resin layer / ethylene-vinyl alcohol copolymer (4 μm) / unsaturated carboxylic acid-modified polyolefin adhesive resin layer / low-density polyethylene resin layer (25 μm).

  About the lid | cover material of said each Example and a comparative example, punching aptitude, an opening test, interlayer intensity | strength, water vapor permeability, and oxygen permeability were evaluated. These measurement conditions, evaluation conditions, and methods will be described below.

<Punching aptitude>
The sample sheet was slit with a round blade, and the presence or absence of generation of residue in the cross section was confirmed.

<Opening test>
Cut the half-cut part from the base film layer side of the sample sheet, heat-mold the protrusion part with a height of 2mm in the center in one place, and fold the film when the sample sheet is folded and opened. The cutting ability was evaluated in five stages according to the degree, and the goodness was evaluated by ○ and the defectiveness was evaluated by × depending on the presence or absence of fuzz.
Evaluation 5: No film remains in the opening mouth Evaluation 4: Almost no film remains in the opening mouth Evaluation 3: Remaining film remains in the opening mouth slightly Evaluation 2: Film remaining in the opening mouth is recognized Evaluation 1: Film remains in the opening mouth Remarkably recognized

<Interlayer strength>
A 15 mm wide sample sheet was peeled off at 50 mm / min with a tensile tester, the interlayer strength was measured, and evaluated in four stages.
Evaluation 4: 9 N / 15 mm width or more Evaluation 3: 6 N / 15 mm width or more to less than 9 N / 15 mm width Evaluation 2: 3.9 N / 15 mm width or more to less than 6 N / 15 mm width Evaluation 1: Less than 3.9 N / 15 mm width

<Water vapor transmission rate>
The water vapor transmission rate of the sample sheet was measured under the conditions of 40 ° C. and 90% RH.
<Measurement conditions for oxygen permeability>
The oxygen gas permeability of the sample sheet was measured under the conditions of 23 ° C. and 90% RH.

  Table 1 shows the evaluation results of the unsealing test, interlayer strength, water vapor transmission rate, and oxygen transmission rate.

  In Examples 1 and 2, good results were obtained in all evaluation tests. On the other hand, in Comparative Example 1, the punchability was poor, the film residue was generated, and the film residue was generated. Comparative Example 2 had poor punchability. Although all the evaluation tests were good, Comparative Example 3 had a conventional structure having a multilayer structure as compared with Examples 1 and 2, and the evaluation was not possible because the polystyrene / sealant layer was coextruded.

DESCRIPTION OF SYMBOLS 1 Base film layer 2 Laminate adhesive layer 3 Rigid film layer 4 Laminate adhesive layer with gas barrier property 5 Sealant layer 10 Laminated body 11 Half cut part 12 Bending line 13 Protrusion part 14 Joint edge part 16 Recessed part 20 Lid material 30 Lamination | stacking Body 40 Bottom material 31 Outer layer 32 Intermediate layer having barrier property 33 Sealant layer 50 Distribution packaging container 60 Distribution packaging body

Claims (8)

The base film layer, the laminate adhesive layer, the rigid film layer, the gas barrier laminate adhesive layer, and the sealant layer are laminated in this order,
A laminate comprising the laminate adhesive layer made of a heat-resistant laminate adhesive.   The laminate according to claim 1, wherein the laminate adhesive layer is made of a two-component reaction curable adhesive of a polyester urethane-based main agent and a polyisocyanate-based curing agent.   The laminate according to claim 2, wherein an NCO group / OH group ratio, which is a molar ratio of an NCO group of the polyisocyanate curing agent to an OH group of the polyester urethane-based main agent, is 2 or more.   The laminate according to claim 1, wherein the sealant layer has a thickness of 30 to 50 μm. A lid for a distribution and packaging container using the laminate according to any one of claims 1 to 3,
It is formed in a straight line at the center of the surface of the laminate, and is formed across the half-cut portion and a half-cut portion formed by a depth cut from the surface of the base film layer of the laminate to the rigid film layer. A lid for a distribution and packaging container, comprising: a protrusion formed by projecting the laminate partly outward from the surface of the base film layer.   The lid for a distribution and packaging container according to claim 5, comprising a plurality of the protrusions. A distribution packaging container comprising a lid for a distribution packaging container according to claim 5 or 6 and a bottom material heat-sealed in contact with a sealant layer of the lid for distribution packaging container,
The distribution packaging container characterized in that the bottom material has an accommodating portion and a flange portion which is in contact with and overlapped with the lid for the distribution packaging container.   8. A distribution package comprising the contents of the container for the bottom material of the distribution package container according to claim 7.

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