JP2014019006A - Film for deep drawing molding, bottom material for deep drawing package, and deep drawing package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for deep drawing molding in which heat seal with a nonwoven cloth of a high density polyethylene can be performed, and that has favorable openability.SOLUTION: A coextrusion multilayer film for deep drawing molding includes: a polyamide resin (PA) layer; a seal layer in which heat seal can be performed with a polyethylene made nonwoven cloth or a disinfection sheet at 135°C or lower; and an easy-peel layer that has a delamination property with the seal layer. A bottom material for deep drawing package is formed by the coextrusion multilayer film for deep drawing molding, and a deep drawing package uses the bottom material for package, and uses a polyethylene made nonwoven cloth or a disinfection sheet as a lid material for a deep drawing package.

Description

  The present invention relates to a film for deep drawing, a bottom material for a deep drawing package, and a deep drawing package that can be suitably used for packaging business gauze, cotton swabs, and the like.

  In recent years, business-use gauze, cotton swabs and the like housed in deep-drawn packages have been distributed at pharmacies, supermarkets, convenience stores and the like. For example, as shown in FIG. 1, the deep-drawn package is obtained by joining a bottom material 20 having a recess 30 at the center and a lid 10 made of high-density polyethylene nonwoven fabric or sterilized paper by heat sealing or the like. Is. The gauze 40 and the like are accommodated in the recess 30 of the bottom material 20.

  Conventionally, a laminate film obtained by laminating a nylon resin (Ny) film and a heat-sealable resin film (laminating method) has been widely used as the bottom material 20 for deep-drawn packages (for example, Patent Document 1). The reason is that a film having this configuration can be heat-sealed at a relatively low temperature with a lid material (for example, a high-density polyethylene nonwoven fabric or sterilized paper), and can provide a certain level of easy peel. is there.

  However, since the resin used in the sealing layer of the laminate film imparts easy peel properties by interfacial peeling from the lid material, the easy peel strength varies greatly due to differences in sealing temperature, pressure, etc. in the manufacturing process. There is a problem that it is difficult to obtain a uniform easy peel strength. Also, if the easy peel strength is high, the lid material is weaker than ordinary plastic lid materials when the lid material is made of polyethylene nonwoven fabric or sterilized paper. There is a problem that it becomes difficult to take out the contents. Furthermore, since the method for producing the film is a laminate method, there is a problem that the cost for producing the film increases.

  On the other hand, in order to solve the above-mentioned problem, a coextruded multilayer film for deep-drawing packaging having good non-woven fabric and sterilized paper and good easy peel properties has been studied (Patent Document 2).

  However, since the easy peel layer of the film described in Patent Document 2 is a cohesive failure layer exposed on the inner surface, there is a disadvantage that fine irregularities are formed on the surface and inferior to external haze. There is also a demand for improving the visibility of the contents from the viewpoint of appearance and safety in the package that is often packaged in the air.

Japanese Patent Laid-Open No. 11-115119 JP 2006-256144 A

  The present invention has been made in view of the above circumstances, and a solution to the problem is to provide a film for deep drawing, a bottom material, and a package that can be heat-sealed with a non-woven fabric of high-density polyethylene and has good openability. There is to do.

  As a result of intensive studies in view of the above problems, the present inventor has found that the above problems can be easily solved by adopting a specific configuration, and the present invention has been completed.

  That is, the gist of the present invention is to have a polyamide resin (PA) layer, a polyethylene non-woven fabric or sterilized paper at 135 ° C. or less and a heat-sealable seal layer, and an easy peel layer having a delamination property between the seal layer. A deep-drawing co-extruded multilayer film, a deep-drawing packaging bottom material characterized by being formed by the deep-drawing co-extrusion multilayer film, and the packaging body bottom material, The present invention resides in a deep drawn package characterized in that a polyethylene non-woven fabric or sterilized paper is used as the cover for the deep drawn package.

  ADVANTAGE OF THE INVENTION According to this invention, the film for deep drawing which can heat seal with the nonwoven fabric of a high density polyethylene, and has favorable openability can be provided, and the industrial value of this invention is high.

It is a schematic explanatory drawing which shows the package body before joining. It is a schematic explanatory drawing which shows the package body after joining a cover material and a bottom material.

  In the present invention, “having delamination” means that when the deep-drawn package is opened, the sealing layer breaks, the sealing layer and the EP layer peel with desired strength, and the sealing layer is a lid material. Say to remain on both sides. Further, “heat-sealable with polyethylene non-woven fabric or sterilized paper” means that when heat-sealed at a predetermined temperature, the bottom material of the present invention and the polyethylene non-woven fabric or sterilized paper can be sealed with a desired easy peel strength. .

In the present invention, the EP layer is usually 50% by mass or more, preferably 80% by mass or more and 99% by mass or less, preferably 95% by mass, as shown below, based on the mass of the entire EP layer (100% by mass). It is preferably composed of the following resin composition A and 1% by mass or more, preferably 5% by mass or more and 50% by mass or less, preferably 20% by mass or less of the resin composition B.
Resin composition A: Resin composition whose main component is polypropylene (PP) or polybutene (PB) Resin composition B: Main component is ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer (EVA), Ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-acrylic acid Methyl copolymers (EMA) and resin compositions that are ionomers thereof

  Here, the “main component” is a component contained in a content of 50% by mass or more, preferably 70% by mass or more, more preferably 85% by mass or more and 95% by mass or less, among the components constituting the entire resin composition. Say.

  The film of the present invention may have at least one polypropylene resin layer (hereinafter also referred to as “PP layer”) on the surface of the PA layer opposite to the surface on the seal layer side.

  The film of the present invention has at least one ethylene-vinyl acetate copolymer layer (hereinafter referred to as “EVA layer”) between the PA layer and the sealing layer and / or between the PA layer and the PP layer. Or a polyethylene resin layer (hereinafter also referred to as “PE layer”).

  The film of the present invention preferably has at least one adhesive resin layer between the PA layer and the seal layer and / or between the PA layer and the PP layer.

  In the film of the present invention, the easy peel strength between the sealing layer and the EP layer is preferably 0.8 N / 15 mm width or more and 5.0 N / 15 mm width or less at 25 ° C.

  In the film of the present invention, the external haze according to JIS K 7128 is preferably 15% or less, more preferably 10% or less.

  The package of the present invention is a deep-drawn package using the above-mentioned bottom material of the present invention as a deep-drawn package and a high-density polyethylene nonwoven fabric or sterilized paper as a deep-drawn package lid. Preferably there is.

  The film of the present invention has at least a PA layer and an EP layer having a non-woven fabric made of polyethylene or sterilized paper and a heat-sealable sealing layer at a temperature of 135 ° C. or lower and having delamination properties. With this configuration, according to the present invention, when a package is formed, an easy peel property that can open the bottom material and the cover material without breaking the nonwoven fabric or sterilized paper at the time of opening can be provided, and the depth is high. A drawn package can be obtained.

  In addition, since the bottom material for deep-drawn packaging body and the deep-drawn packaging body of the present invention include the film of the present invention, the bottom material for deep-drawn packaging body and the depth that have desired easy peel properties for nonwoven fabrics and sterilized paper. A squeeze package can be provided.

  The film of the present invention has at least a PA layer and an EP layer having a non-woven fabric made of polyethylene or sterilized paper and a heat-sealable sealing layer at a temperature of 135 ° C. or lower and having delamination properties.

The film of the present invention preferably has an external haze of 15% or less without impairing the appearance.
In the present invention, it is important to provide at least one PA layer for the purpose of imparting pinhole resistance and deep drawability.

  PA is not particularly limited, but nylon-based resin (Ny) is preferably used from the viewpoint of pinhole resistance. Examples of Ny include polymers of condensed units such as 6 nylon, 66 nylon, 69 nylon, 6-66 nylon, 12 nylon, 11 nylon, 610 nylon, 612 nylon, 6I-6T nylon, and MXD6 nylon, or two of these. Copolymers with the above, and mixtures thereof can also be mentioned. Among them, it is preferable to use 6 nylon or 6-66 nylon.

  The thickness of the PA layer is preferably at least 5 μm, more preferably 10 μm or more, and even more preferably 15 μm or more from the viewpoint of pinhole resistance and moldability. The thickness of the PA layer is preferably 200 μm or less, more preferably 180 μm or less, and even more preferably 150 μm or less. When the lower limit value of the thickness of the PA layer is 5 μm, good pinhole resistance can be obtained, and when the upper limit value is 200 μm, the thermoformability of the film can be maintained well.

  It is important that the film of the present invention has a sealing layer that can be heat-sealed with a polyethylene non-woven fabric or sterilized paper at a temperature of 135 ° C. or less as the innermost layer. That is, in the sealing layer, the nonwoven fabric made of polyethylene or sterilized at a sealing temperature of 135 ° C. or lower, preferably 130 ° C. or lower, more preferably 125 ° C. or lower, and 100 ° C. or higher, preferably 105 ° C. or higher, more preferably 110 ° C. or higher. It is important to use a resin that can be heat sealed to paper. By constituting the sealing layer with such a resin, it is possible to prevent the non-woven fabric made of polyethylene from being melted when heat-sealing using a deep-drawing packaging machine, and the sealing portion on the non-woven fabric side to become transparent and deteriorate in appearance. it can.

  The resin constituting the sealing layer is not particularly limited as long as it is a resin that can be heat-sealed with a polyethylene non-woven fabric or sterilized paper within the sealing temperature range and has a delamination property with respect to the EP layer. The sealing layer can be composed of a resin described below.

  The sealing layer has a melting point of 120 ° C. or lower, preferably 100 ° C. or lower, more preferably 75 ° C. or higher and 85 ° C. or lower, and a melt flow rate (MFR) measured under conditions of 190 ° C. and 21.18 N load according to JIS K 7210. Is usually in the range of 1 g / 10 min to 15 g / min, preferably 2 g / 10 min to 10 g / 10 min, ethylene-α-olefin copolymer, linear low density polyethylene (LLDPE), ethylene-acetic acid Vinyl copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA) and a small group selected from the group consisting of these ionomers It is comprised by 1 or more types of resin compositions at least.

  By selecting the sealing layer within the melting point range and within the MFR range, the impregnation property into the polyethylene non-woven fabric or the sterilized paper is enhanced, and the stable sealing strength is expressed within the sealing temperature range described above. During winding, molding and transporting with a packaging machine, problems such as blocking are less likely to occur, and production efficiency and handling are improved.

  The thickness of the seal layer is usually 0.1 μm or more, preferably 1 μm or more, more preferably 2 μm or more from the viewpoint of film formability and peel appearance, and the passage is 10 μm or less, preferably 5 μm or less, more preferably 4 μm or less. It is desirable to be in the range. By making the thickness of the EP layer 2 μm or more, stable film forming properties can be obtained. On the other hand, by setting the thickness of the EP layer to 4 μm or less, it is possible to make it difficult for film residue to occur during peeling, and a good peel appearance can be obtained.

  The resin constituting the EP layer is not particularly limited as long as it is a resin having delamination properties with the seal layer. The EP layer can be composed of, for example, a resin composition A and a resin composition B described below which are different from each other.

  As the resin composition A, the main component is polypropylene (PP) or polybutene (PB). As the polypropylene, a homopolymer, a random copolymer, a block copolymer, or a mixture thereof can be used. In view of the above, it is preferable to use a random PP copolymer.

  As the resin composition B, the main component is ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer. (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA), and ionomers of these can be used. It is preferable to use an ethylene-α-olefin copolymer from the viewpoint of the property (beauty of the peeled surface).

  The content rate of the resin composition A is 50 mass% or more normally about the resin composition A with respect to the mass (100 mass%) of the whole EP layer from an openability viewpoint, Preferably it is 80 mass% or more, and is normally 99. It is desirable that the content is not more than mass%, preferably not more than 95 mass%.

  From the same viewpoint, the content of the resin composition B is usually 1% by mass or more, preferably 5% by mass or more, and usually 50% by mass or less, preferably 20% by mass or less. By setting the content of the resin composition A to 80% by mass or more (that is, the content of the resin composition B is 20% by mass or less), good delamination with the seal layer resin can be maintained.

  The easy peel strength between the sealing layer and the EP layer is usually 0.8 N / 15 mm width or more, preferably 1.0 N / 15 mm width or more at 25 ° C. from the viewpoint of the balance between easy opening and sealing properties. / 15 mm width or less, preferably 3.0 N / 15 mm width or less. The easy peel strength was obtained by cutting the seal portion of the deep drawn package formed of the film of the present invention into a strip shape having a width of 15 mm, and peeling the lid material and the bottom material at a speed of 200 mm / min using a tensile tester. It can be obtained from the maximum load at the time.

  In the film of the present invention, an outer layer can be further provided on the surface of the PA layer opposite to the surface on the seal layer side. An intermediate layer can also be provided between the PA layer and the EP layer. Here, the “outer layer” refers to a single layer or a layer composed of two or more layers provided on the surface of the PA layer opposite to the surface on the seal layer side. The “intermediate layer” refers to a single layer or a layer composed of two or more layers provided between the PA layer and the EP layer or between the PA layer and the outer layer. Below, each layer which comprises an outer layer and an intermediate | middle layer is demonstrated.

  The film of this invention can arrange | position a polypropylene layer (PP layer) suitably as an outer layer of PA layer for the purpose of providing hardness. The kind of PP used in the PP layer is not particularly limited, and examples thereof include a random copolymer, a block copolymer, a homopolymer, or a mixture thereof. Among these, a random copolymer is preferred from the viewpoint of deep drawability.

  The film of the present invention comprises an ethylene-vinyl acetate copolymer layer (EVA layer) or a polyethylene layer for the purpose of imparting flexibility between the PA layer and the EP layer and / or between the PA layer and the PP layer. (PE layer) can be disposed as an intermediate layer. On the other hand, in addition to the outer layer, a PP layer can be disposed on the intermediate layer in the same manner as described above for the purpose of imparting hardness.

  The ethylene content of EVA used in the EVA layer is not particularly limited, but is usually 1 mol% or more, preferably 1.5 mol% or more, and usually 20 mol% or less from the viewpoint of film formation stability. Preferably, it is 15 mol% or less. When the EVA layer is provided, the thickness of the EVA layer is 10 μm or more, preferably 20 μm or more, more preferably 25 μm or more, and the upper limit is 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less from the viewpoint of film forming properties. It is desirable.

  When a PE layer is disposed as an intermediate layer, the PE used in the PE layer is not particularly limited. For example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene ( HDPE) or a mixture of LDPE and HDPE can be used. The mixing ratio in the mixture of LDPE and HDPE can be appropriately determined for the purpose of imparting desired flexibility. For example, the mixing ratio of LDPE and HDPE is 40 to 80:60 to 20, preferably 50 to 80 by mass ratio. : 50 to 20, more preferably 60 to 80: 40 to 20.

  LDPE or LLDPE having a density of 0.90 or more is preferable, and HDPE having a density of 0.94 or more is preferably used. By using a high-density material, moderate hardness can be imparted to the PE layer while maintaining flexibility. When the PE layer is provided, the thickness of the PE layer is 10 μm or more, preferably 20 μm or more, more preferably 25 μm or more, and the upper limit is 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less.

  In the film of the present invention, an adhesive resin layer can be disposed in the intermediate layer or the outer layer in order to adhere each layer. The adhesive resin used in the adhesive resin layer is not particularly limited as long as the PA layer, PE layer, and PP layer can be bonded to the required strength, but a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof is preferable. Can be used. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, citraconic acid and the like. In addition, esters and anhydrides of the unsaturated carboxylic acid can be used as the adhesive resin, and as derivatives, methyl acrylate, methyl methacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, butyl methacrylate, glycidyl acrylate In addition to glycidyl methacrylate, acrylamide, methacrylamide, sodium acrylate, etc., vinyl acetate can be used. As a commercially available adhesive resin, the Mitsui Chemicals Co., Ltd. make and brand name Admer are mentioned, for example, These can be used conveniently.

  It is preferable that at least one adhesive resin layer is provided between the PA layer and the EP layer and / or between the PA layer and the PP layer from the viewpoint of further increasing the interlayer adhesive strength. Specifically, one or more layers are preferably provided between the PA layer and the EP layer, between the PA layer and the PE layer, between the PA layer and the EVA layer, and between the PA layer and the PP layer.

  The thickness of the adhesive resin layer is not particularly limited as long as each layer can be bonded with a required adhesive strength, but is usually 2 μm or more, preferably 3 μm or more, more preferably 5 μm or more, and usually 20 μm or less, preferably 15 μm or less, more preferably It is desirable that it is 10 μm or less.

  The layer configuration of the film of the present invention is not particularly limited as long as the outermost layer is a PA layer, the innermost layer is a seal layer, and an EP layer adjacent to the seal layer is disposed. For example, when represented by PA layer (A), PE layer (B), EVA layer (C), PP layer (D), EP layer (E), seal layer (F) and adhesive resin layer (G), The layer structure can be formed. Among them, the preferable layer configuration is the following (1), (3), (5) or (7), and the most preferable layer configuration is (1) or (5).

(1) A / G / E / F
(2) A / G / B / E / F
(3) A / G / C / E / F
(4) D / G / A / G / E / F
(5) D / G / A / G / B / E / F
(6) D / G / A / G / C / E / F
(7) A / G / A / G / E / F
(8) A / G / A / G / B / E / F
(9) A / G / A / G / C / E / F
(10) D / A / G / A / G / E / F
(11) D / A / G / A / G / B / E / F
(12) D / A / G / A / G / C / E / F

  The film of the present invention comprises a PA layer, an EP layer and a sealing layer, an intermediate layer formed therebetween, and an outer layer formed on a surface of the PA layer opposite to the surface on the sealing layer side simultaneously or It can be produced by sequentially laminating.

  The film of the present invention is obtained by co-extrusion using an extruder equipped with a die by an existing method such as a T-die method or a tubular method, so that a polyamide resin layer, an easy peel layer, a seal layer, an intermediate layer and an outer layer are simultaneously formed. Can be produced. In addition, the laminated film can be sequentially produced by separately forming the resin constituting each layer and then laminating them using a press method or a roll nip method.

  In addition, various additives such as inorganic fillers, organic fillers, antioxidants, weather stabilizers, light stabilizers, anti-blocking agents, lubricants, nucleating agents, or pigments are added to each base layer as long as the respective characteristics are not impaired. An agent may be blended.

PE that constitutes a non-woven fabric made of polyethylene that is heat-sealed with a sealing layer is capable of heat-sealing with an EP layer, and has a characteristic that prevents the entry of fungi into the container when the non-woven fabric is formed If it can exhibit property), it will not be specifically limited. As such PE, various PEs such as HDPE, LDPE, and LLDPE can be used. Among them, it is preferable to use HDPE excellent in heat sealability. The non-woven fabric made of polyethylene preferably has small pores that can exhibit air permeability and antibacterial properties when a deep-drawn packaging container is formed. It is desirable that the nonwoven fabric has a basis weight of 10 g / m ² or more and less than 500 g / m ² .

The sterilized paper to be heat-sealed with the sealing layer is not particularly limited as long as it can exhibit air permeability and antibacterial properties. Such a sterilized paper is preferably a sterilized paper having a basis weight of 40 g / m ² or more and less than 300 g / m ² .

  The film of the present invention can be used as a deep-drawn package by filling a content such as gauze after deep-drawing, and covering and heat-sealing a lid material film thereon. In particular, when the film of the present invention is used as the bottom material of a deep drawn package, a good deep drawn package can be obtained. For deep drawn packaging

  When used as a bottom material, for example, after forming the film of the present invention into a desired shape and size with a deep drawing mold (film supply process and film forming process), the contents such as sliced ham are filled therein. (Content filling process), and further sealing with a lid material film (cover material film supplying process and sealing process), vacuum packaging (vacuum packaging process), cooling (cooling process), and cutting ( Cutting step), a deep drawn package can be produced.

  The lid of the deep-drawn package of the present invention is preferably breathable when the entire package is sterilized with ethylene oxide gas (EOG). From such a viewpoint, a non-woven fabric or sterilized paper made of polyethylene (particularly HDPE) is suitably used as the lid of the deep drawn package of the present invention.

  The package of the present invention can be produced by adhering the above-mentioned lid material and the bottom material of the present invention by an adhesive means such as heat sealing.

  Examples of the present invention will be described below, but the present invention is not limited thereto. The sample preparation method and evaluation method in the present invention are as follows.

[Preparation of packed sample]
Using a deep-drawing packaging machine (FV6300 manufactured by Omori Machine Industry Co., Ltd.), deep drawing was performed into a shape having a length of 160 mm, a width of 120 mm, and a drawing depth of 50 mm, gauze 50 g was put, a lid was covered, and the frame was sealed. The lid material was a high density polyethylene nonwoven fabric.

<Minimum heat seal temperature>
In the deep-drawing packaging machine, the temperature at which the heat sealing is sufficiently performed at the sealing time of 2 seconds was defined as the minimum heat sealing temperature.

<Easy peel strength>
The seal portion of the packed product was cut into a strip shape having a width of 15 mm with respect to the film flow direction, and the maximum load when the lid material and the bottom material were peeled off at a speed of 200 mm / min with a tensile tester was defined as easy peel strength.

<Peelability>
The case where the cover material was not torn when the pack product was peeled by hand was rated as ○, and the case where it was torn was rated as x.

<Deep drawability>
A festival that was deep-drawn into a shape having a length of 160 mm, a width of 120 mm, and a drawing depth of 50 mm was marked with “◯” for those that could be molded as they were, and “x” for those that could not be molded or the film was broken.

<Appearance>
The high density polyethylene non-woven fabric in the heat seal part was not melted during heat sealing and remained white, and the melt was discolored transparently was marked with x.

<Haze>
External film haze measurement was performed in accordance with JIS K 7128 on the flat film before molding.

Example 1:
A film having the following layer constitution was obtained by co-extrusion of all layers, and Example 1 was obtained.
Ny (50 μm) / Adhesive resin (20 μm) / LLDPE1 (46.5 μm) / EP1 (110.5 μm) / Seal 1 (3 μm)
Ny: Mitsubishi Engineering Plastics Novamid (6Ny)
Adhesion resin: Admer made by Mitsui Chemicals LLDPE1: Moretech made by Idemitsu Petrochemical EP1: A blend of random PP copolymer (90%) and ethylene α-olefin copolymer (10%) Seal 1: Moretech made by Idemitsu Petrochemical (melting point: 117 ° C, MFR: 10)

Example 2:
A film having the following layer constitution was obtained by coextrusion of all layers, and was designated as Example 2.
PP (20 μm) / Adhesive resin (10 μm) / Ny (30 μm) / Adhesive resin (10 μm) / EVA1 (10 μm) / EP2 (30 μm) / Seal 2 (5 μm)
Adhesive resin: Mitsui Chemicals Admer Ny: Mitsubishi Engineering Plastics Novamid (66-Ny ratio of 6-66 copolymerized Ny)
EVA1: Japan Polyethylene Novatec EVA (VAC 5%)
EP2: Blend of random PP copolymer (95%) and ethylene α-olefin copolymer (5%) Seal 2: Lexpearl EMA made by Nippon Polyethylene (melting point: 77 ° C., MFR: 2.6)

Comparative Example 1:
A film having the following layer structure was obtained by coextrusion of all layers, and was designated as Comparative Example 1.
Ny (40 μm) / adhesive resin (10 μm) / LLDPE1 (40 μm) / EP3 (5 μm)
EP3: Blend of EVA (60%) and polybutene (40%) with a melting point of 80 ° C.

Comparative Example 2:
A film having the following layer structure was obtained by coextrusion of all layers, and was designated as Comparative Example 2.
PP (20 μm) / Adhesive resin (10 μm) / Ny (30 μm) / Adhesive resin (10 μm) / EVA1 (20 μm) / EP1 (10 μm) / Seal 4 (3 μm)
Seal 4: LLDPE with a melting point of 125 ° C.

Comparative Example 3:
A film having the following layer structure was obtained by coextrusion of all layers, and was designated as Comparative Example 3.
PP (50 μm) / Adhesive resin (10 μm) LLDPE1 (30 μm) / EP1 (50 μm) / Seal 1 (3 μm)

Comparative Example 4:
A film having the following layer structure was obtained by coextrusion of all layers, and was designated as Comparative Example 4.
Ny (40 μm) / Adhesive resin (10 μm) / EP4 (40 μm) / Seal 1 (4 μm)
EP4: random PP copolymer (45%) and ethylene alpha olefin copolymer (55%)

Comparative Example 5:
A film having the following layer structure was obtained by coextrusion of all layers, and was designated as Comparative Example 4.
Ny (40 μm) / Adhesive resin (10 μm) / EP1 (40 μm) / Seal 1 (12 μm)

  The film of the present invention can be suitably used as a packaging material for business gauze, cotton swabs and the like.

DESCRIPTION OF SYMBOLS 10 Cover material 20 Bottom material 30 Concave part 40 Contents, such as gauze 50 Heat seal part

Claims (11)

Deep drawing molding characterized by having a polyamide resin (PA) layer, a polyethylene non-woven fabric or sterilized paper at 135 ° C. or less and a heat-sealable seal layer, and an easy peel layer having a delamination property between the seal layer Coextruded multilayer film. The easy peel layer is composed of 50 to 99 mass% of the following resin composition A and 1 to 50 mass% of the following resin composition B, based on the mass (100 mass%) of the entire easy peel layer. Item 2. A coextruded multilayer film for deep drawing according to Item 1.
Resin composition A: Resin composition whose main component is polypropylene (PP) or polybutene (PB) Resin composition B: Main component is ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer (EVA), Ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-acrylic acid Methyl copolymers (EMA) and resin compositions that are ionomers thereof The sealing layer resin has a melting point of 120 ° C. or less, and a melt flow rate (MFR) measured under the conditions of 190 ° C. and 21.18 N load according to JIS K 7210 is within a range of 1 g / 10 min to 15 g / min. Yes, ethylene-α-olefin copolymer, linear low density polyethylene (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer Polymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA) and at least selected from the group consisting of these ionomers The coextruded multilayer film for deep drawing according to claim 1 or 2, comprising at least one resin composition. Mu. The coextruded multilayer film for deep drawing according to any one of claims 1 to 3, wherein the seal layer has a thickness of 0.1 to 10 µm. The coextrusion for deep drawing according to any one of claims 1 to 4, further comprising at least one polypropylene resin (PP) layer on a surface opposite to the surface on the seal layer side of the polyamide resin (PA) layer. Multilayer film. At least one ethylene-vinyl acetate copolymer (EVA) layer or polyethylene between the polyamide resin (PA) layer and the sealing layer, or between the polyamide resin (PA) layer and the polypropylene resin (PP) layer. The coextruded multilayer film for deep drawing according to any one of claims 1 to 5, which has a resin (PE) layer. 7. The adhesive resin layer according to claim 1, further comprising at least one adhesive resin layer between the polyamide resin (PA) layer and the sealing layer or between the polyamide resin (PA) layer and the polypropylene resin (PP) layer. A coextrusion multilayer film for deep drawing as described in 1. The external extrusion haze according to JIS K 7128 is 15% or less. The coextruded multilayer film for deep drawing according to any one of claims 1 to 7. The coextruded multilayer film for deep drawing according to any one of claims 1 to 8, wherein an easy peel strength between the seal layer and the easy peel layer is in a range of 0.8 to 5.0 N / 15 mm width at 25 ° C. A bottom material for a deep-drawn package, which is formed of the coextruded multilayer film for deep-drawing molding according to any one of claims 1 to 9. A deep-drawing package using the bottom material according to any one of claims 1 to 9 as a bottom material for a deep-drawn package, and a polyethylene non-woven fabric or sterilized paper as a lid for the deep-drawn package. body.

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