JP5047678B2 - Packaging material having aluminum vapor deposition film and packaging bag using the same - Google Patents

Description

  The present invention relates to a packaging material having an aluminum vapor deposition film, and more particularly to a food packaging material having an aluminum vapor deposition film manufactured by extrusion lamination. Furthermore, the present invention relates to a packaging bag using the packaging material.

  Since the required properties for packaging materials are diverse, it is difficult to manufacture a packaging material that satisfies all of the required properties with a single film. Therefore, in general, the packaging material is provided as a laminate in which a plurality of films having different properties are laminated.

  It is effective to provide an aluminum vapor deposition layer for the purpose of improving gas barrier property (particularly oxygen barrier property), which is one of the required properties for the packaging material (for example, JP-A-2004-1888). The aluminum vapor deposition layer can be formed by heating and evaporating aluminum with an electron beam or high frequency induction in a high vacuum state, and attaching the vapor to the surface of a resin film such as PET. A film having aluminum deposited on its surface is called an aluminum deposited film.

  As a method of bonding the layers constituting the packaging material, there is an extrusion laminate using heat-melted polyethylene as an adhesive. At this time, an anchor coat (AC) in which an adhesive or an adhesion assistant is thinly applied to the film is often performed (for example, JP-A-2004-42477).

When bonding an aluminum vapor deposition film layer and another base material layer by extrusion lamination, "water-soluble imine-based coating agent" has been frequently used as an anchor coating agent from the viewpoint of cost and delivery. In addition, nylon is used for the outermost layer to prevent pinholes in food bags, and when printing on the back side, it is common to print with urethane type ink that does not contain a curing agent from the viewpoint of cost. It was the target.
JP 2004-1888 A JP 2004-42477 A

  The metal aluminum surface on the aluminum vapor-deposited film originally has a metallic luster, but it loses its metallic luster and changes color during processing of packaging materials, filling of contents, distribution process or consumption process, and further transparency. Cases to be reported are frequently reported. Until now, the cause of such discoloration and transparency regarding the aluminum vapor-deposited film has not been elucidated, and therefore the fundamental countermeasures have not been devised. Because most of the packaged contents are food, even if there is no effect on gas barrier properties and other functions, changes in appearance may cause anxiety for consumers and distrust to manufacturers. There is a risk of giving.

  An object of the present invention is to provide means for preventing discoloration and transparency of a metal aluminum surface on an aluminum deposited film under such circumstances. More specifically, an object of the present invention is to provide a packaging material having a laminated structure capable of preventing discoloration and transparency of a metal aluminum surface in a packaging material having an aluminum vapor deposition film. Furthermore, this invention makes it another subject to provide the packaging bag with which the content was filled using such a packaging material.

In order to solve the above problems, the present inventor first investigated the cause of discoloration and transparency of the metal aluminum surface. As a result, the discoloration and transparency are achieved by the moisture in the contents filled in the packaging bag passing through each base material layer constituting the packaging bag from the inner surface toward the outer surface and reaching the outermost layer. It has been found that when the moisture reaching the outer layer is placed in a state where it is difficult to evaporate and scatter, the metal aluminum surface is placed under high moisture, and it is generated by oxidation over time. The metal aluminum surface forming the aluminum vapor-deposited film is oxidized by moisture contained in the packaged contents to become aluminum oxide (Al ₂ O ₃ ), thereby causing discoloration and transparency. When forming aluminum oxide, the metallic luster of aluminum disappears and it becomes transparent. The transparent one is called “aluminum disappearance”.

  The state in which moisture is hardly evaporated and scattered is, for example, in the case of barrier materials such as bags being in close contact with each other, PVA (polyvinyl alcohol) coated film, PVDC (polyvinylidene chloride) coated film, aluminum vapor deposition film, aluminum foil bonding film, etc. This occurs when stored in close contact (see FIG. 2).

  Oxidation is greatly affected by the environmental temperature at which the bag is stored, and does not occur at about 20 ° C. at normal temperature, but it occurs in a shorter time as the temperature increases to 30 ° C., 40 ° C., or even 50 ° C. In addition, when the humidity is high, the temperature is not affected so much at normal temperature, but discoloration and transparency occur rapidly at a high temperature. Therefore, discoloration and transparency of metal aluminum is likely to occur particularly at high temperatures and high humidity in summer.

  Further, when oil, acid, alkali, or the like is present inside or outside the bag, the metal aluminum surface gradually changes in color and becomes transparent although it is not affected as much as moisture.

  Even when discoloration and transparency occur, since aluminum oxide has gas barrier properties, the gas barrier function such as oxygen barrier properties that the aluminum vapor deposition surface originally has hardly changes.

In one aspect, the present invention completed through the investigation of the cause as described above is a packaging material made of a laminate having an aluminum vapor-deposited film layer, and at least one base layer outside the aluminum vapor-deposited film layer Is a hydrophobic layer. Even if the base material layer inside the aluminum vapor deposition film layer is hydrophobized, no effect is obtained.
There is no restriction | limiting in particular in the manufacturing method of a laminated body, What is necessary is just to select and use suitably well-known lamination techniques, such as extrusion lamination, dry lamination, hot melt lamination, wet lamination, wax lamination, and thermal lamination.
“Outside the aluminum vapor deposition film layer” means the side closer to the outer surface exposed to the atmosphere than the aluminum vapor deposition film layer when the bag is made, and the side farther from the inner surface with which the contents come into contact. .

  In one embodiment, the packaging material according to the present invention is a packaging material characterized in that the anchor coat layer outside the aluminum vapor deposition film layer is made hydrophobic. In one embodiment, the anchor coat layer may be composed of a two-component curable urethane adhesive in which a polyol component as a main component and a polyisocyanate component as a curing agent generate a urethane bond.

  In another embodiment, the packaging material according to the present invention is a packaging material characterized in that the ink layer outside the aluminum vapor deposition film layer is made hydrophobic. In one embodiment, the ink layer may be composed of a two-component curable urethane ink in which a polyol component as a main component and a polyisocyanate component as a curing agent generate a urethane bond.

Moreover, the packaging material according to the present invention is a packaging material characterized in that, in another embodiment, the outermost layer is a hydrophobic polymer. In one embodiment, the hydrophobic polymer can be selected from the group consisting of biaxially oriented polypropylene (OPP), polyethylene terephthalate (PET), and unstretched polypropylene (CPP).
The “outermost layer” is a layer that forms the outer surface when the bag is made, and is the layer farthest from the inner surface with which the contents come into contact.

In another aspect of the present invention,
a) a first thermoplastic polymer layer;
b) an optional ink layer;
c) a hydrophobic anchor coat layer;
d) a polyethylene layer;
e) an aluminum deposited film layer;
f) an anchor coat layer;
g) a polyethylene layer;
h) a second thermoplastic polymer layer as a sealant;
Are provided in this order from the outer surface toward the inner surface.

  In one embodiment, the packaging material according to the present invention includes: e) an aluminum vapor-deposited film layer and b) an ink layer optionally printed with a) a first thermoplastic polymer layer, c) a hydrophobic anchor coat Layer and d) by extrusion lamination with polyethylene layer as adhesive.

  In another embodiment of the packaging material according to the present invention, one or both of a) the first thermoplastic polymer layer and b) the ink layer are hydrophobic.

  In still another embodiment of the packaging material according to the present invention, c) the hydrophobic anchor coat layer is composed of a two-component curable urethane adhesive in which the main component polyol component and the curing agent polyisocyanate component form a urethane bond. Is done.

  In another embodiment of the packaging material according to the present invention, a) the first thermoplastic polymer layer is selected from the group consisting of biaxially oriented polypropylene (OPP), polyethylene terephthalate (PET), and unstretched polypropylene (CPP). Consists of materials.

  In still another embodiment of the packaging material according to the present invention, b) the ink layer is composed of a two-component curable urethane ink in which the polyol component of the main agent and the polyisocyanate component of the curing agent generate urethane bonds.

  In still another embodiment, the packaging material according to the present invention is a packaging material for food.

  In still another aspect, the present invention is a packaging bag filled with contents using the packaging material.

  In yet another aspect, the present invention provides a method for preventing discoloration and transparency of a packaging bag, wherein a breathable material is sandwiched between the bags when a plurality of packaging bags according to the present invention are stacked.

  In still another aspect, the present invention provides a method for preventing discoloration and transparency of a packaging bag, wherein a moisture-permeable material is used as a material for the outer bag when the packaging bag according to the present invention is packed in the outer bag.

  ADVANTAGE OF THE INVENTION According to this invention, in the packaging bag filled with the contents, such as foodstuff, it becomes possible to prevent discoloration and transparency of the metal aluminum surface on an aluminum vapor deposition film layer.

  Hereinafter, embodiments of the present invention will be described in more detail, but the present invention is not limited to these embodiments.

  FIG. 1 is a schematic cross-sectional view of an embodiment of a laminate constituting the packaging material according to the present invention. Here, the first thermoplastic polymer layer 11, the ink layer 12, the hydrophobic anchor coat layer 13, the polyethylene layer 14, the aluminum vapor deposited film layer 15, the anchor coat layer 16, the polyethylene layer 17, and the sealant The second thermoplastic polymer layer 18 is provided in this order from the outer surface to the inner surface.

  For the first thermoplastic polymer layer 11, a thermoplastic polymer material known to those skilled in the art as being usable as the outermost layer of the packaging material can be used without limitation. However, since it is the outermost layer, the strength, heat resistance, printing, etc. It is preferable to have appropriate characteristics. Accordingly, suitable materials for use in the first thermoplastic polymer layer 11 include, but are not limited to, 6-nylon, 6,6-nylon, 6,10-nylon, 6,12-nylon, Examples thereof include polyamide resins such as 11-nylon and 12-nylon, polyethylene terephthalate (PET), polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinyl alcohol copolymer processed into a film, or cellophane. From the viewpoint of mechanical strength and dimensional stability, these are preferably uniaxially stretched or biaxially stretched. In addition, although the polyamide resin has high strength characteristics, it has high hygroscopicity, and when placed in a state in which moisture is not easily evaporated and scattered, the metal aluminum surface is easily placed under high moisture. Therefore, if importance is attached to the viewpoint of preventing discoloration and transparency of the aluminum surface, it is preferable to use a hydrophobic material as the first thermoplastic polymer layer 11, and such a material is not limited, for example. Biaxially stretched polypropylene (OPP) and polyethylene terephthalate (PET) are mentioned.

  The thickness of the first thermoplastic polymer layer 11 is not particularly limited, but is generally 8 to 100 μm, preferably 12 to 50 μm from the viewpoint of processability, mechanical suitability, and heat seal suitability.

  Although the ink layer 12 is not essential, when the ink layer 12 is provided, a polymer material known to those skilled in the art as being usable as an ink for a packaging material can be used without limitation, for example, urethane, Examples include inks based on resins, chlorinated PP resins, vinyl acetate resins, and nitrified cotton. These may be either one liquid type or two liquid type. Also, the ink layer rarely covers the entire adjacent first thermoplastic polymer layer 11, and usually only partially covers the layer 11, so even if the ink layer is made hydrophobic, the aluminum surface is discolored and made transparent. The function to prevent is small. However, in the case where the majority, preferably all, of the first thermoplastic polymer layer 11 is covered with ink, a two-component ink to which a curing agent is added as the ink is used to form a hydrophobic ink. Discoloration and transparency can be prevented. Examples of the hydrophobic ink include two-component curable urethane ink and vinyl acetate ink in which the polyol component of the main agent and the polyisocyanate component of the curing agent generate a urethane bond.

  As a film base material in the aluminum vapor-deposited film layer 15, a film base material known to those skilled in the art as being usable as a film base material of the aluminum vapor-deposited film layer 15 can be used without limitation. For example, it is not limited. Polyethylene terephthalate (PET), biaxially stretched polypropylene (OPP), unstretched polypropylene (CPP), polyethylene (PE), and biaxially stretched nylon can be used. From the viewpoint of gas barrier properties and deposition stability, it is preferable to use polyethylene terephthalate (PET).

  Although the thickness of the film base material of the aluminum vapor deposition film layer 15 does not have a restriction | limiting in particular, from a viewpoint of workability and economical efficiency, it is generally 10-40 micrometers, Preferably it is 12-25 micrometers.

  The aluminum vapor deposition layer in the aluminum vapor deposition film layer 15 can be formed by any method known to those skilled in the art as being capable of forming an aluminum vapor deposition film layer. It can be formed by heating and evaporating by induction or the like, and attaching the vapor to the surface of the film substrate. The aluminum vapor deposition layer gives a metallic luster appearance, light shielding properties, gas barrier properties, etc., and the thickness is not particularly limited, but is generally 100 to 600 nm, preferably 300 nm from the viewpoint of barrier properties and economy. ~ 500 nm.

  For the second thermoplastic polymer layer 18 as a sealant, any thermoplastic polymer material known to those skilled in the art as being usable as an innermost layer of a packaging material as a heat seal material can be used without limitation. Low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene / vinyl acetate copolymer film (EVA), metallocene polyethylene, Ionomer PE, unstretched polypropylene (CPP), or the like can be used. When these stretched polymer materials are used, they tend to become wrinkles at the time of heat sealing, and therefore unstretched materials are preferred. Moreover, it is preferable to use LLDPE, CPP, or EVA from a heat sealing suitability and economical viewpoint.

  The thickness of the second thermoplastic polymer layer 18 is not particularly limited, but is generally 25 to 100 μm, preferably 30 to 50 μm from the viewpoints of processability, economy, and tearability.

  Examples of a material that can be used for the hydrophobic anchor coat layer 13 include a two-component curable urethane adhesive in which a main component polyol component and a curing agent polyisocyanate component generate a urethane bond. The compounding ratio of the polyol component and the isocyanate component can be adjusted appropriately by those skilled in the art. However, if the isocyanate component is too small, there is a risk of poor curing, and if too large, blocking or the like occurs. There may be a problem in processing. Therefore, the ratio of the NCO group (mol) derived from the isocyanate component to the OH group (mol) derived from the polyol component is generally 1 to 5, preferably 1 to 3, and preferably 1. Is most preferred.

  Examples of the polyol component include, but are not limited to, polyester compounds obtained by dehydration condensation of dibasic acids and dihydric alcohols such as polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, polycaprolactone, and polyoxypropylene. Examples include diol, polytetramethylene glycol ether, and polyoxyethylene diol.

  Examples of the polyisocyanate component include, but are not limited to, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-methylene bis (cyclohexyl isocyanate), 2, Examples include 4,6-triisocyanatotoluene. Of these, tolside diisocyanate is preferred for versatility.

  The thickness of the hydrophobic anchor coat layer 13 is not particularly limited, but is generally 0.06 to 0.4 [mu] m, preferably 0.1 to 0.2 [mu] m from the viewpoints of adhesiveness and dryness.

  On the other hand, the anchor coat layer 16 does not need to be hydrophobic, and any material known to those skilled in the art can be used as the anchor coat material. For example, but not limited to, saturated polyester resin, unsaturated polyester resin , Polyamide resin, polyurethane resin, polyolefin resin, polyethyleneimine, polyethylene oxide, organometallic alkoxide and the like. From the viewpoint of production efficiency, it is preferable to use the same hydrophobic anchor coat material as the anchor coat layer 13.

  The thickness of the anchor coat layer 16 is not particularly limited, but is generally 0.06 to 0.4 μm, preferably 0.1 to 0.2 μm from the viewpoints of economy and adhesiveness.

  The anchor coat layers 13 and 16 can be formed by dispersing or dissolving the above-described materials in a suitable organic solvent and applying and drying on the surface of a desired substrate.

  Although there is no restriction | limiting in particular in the thickness of the laminated body which has the above structures, it is common that thickness is 60-120 micrometers as a whole from a viewpoint of intensity | strength, tearability, and economical efficiency, Preferably it is 75-90 micrometers. is there.

  The packaging material according to the present embodiment can be produced by extrusion lamination. For example, the first thermoplastic polymer layer 11 on which the ink layer 12 is printed and the aluminum vapor deposition film layer 15 are laminated by extrusion lamination using the hydrophobic anchor coat layer 13 and the polyethylene layer 14 as adhesives. The aluminum vapor deposition film layer 15 and the second thermoplastic polymer layer 18 are laminated by extrusion lamination using the anchor coat layer 16 and the polyethylene layer 17 as an adhesive.

  For each layer constituting the packaging material, known additives such as antioxidants, heat stabilizers, ultraviolet absorbers, plasticizers, antistatic agents, slip agents, pigments, dyes, antifogging agents, and the like are necessary. You may mix | blend.

  The content to be packaged using the packaging material according to the present invention is not particularly limited, but is particularly effective for food packaging, and it is effective for food products with high water content such as marine products, ham, cheese, Japanese confectionery, etc. Effective for packaging. Further, the packaging material according to the present invention also has an effect of preventing discoloration and transparency of the aluminum surface due to oil, acid, alkali and the like.

  The packaging material according to the present invention can be processed into a packaging bag by any known means. For example, the second thermoplastic polymer layer 18 as a sealant may be heat-sealed only at a desired location to form a bag.

Further, when a plurality of packaging bags are stacked for the purpose of transporting or storing, it is more effective to prevent the bags from coming into contact with each other so that moisture that has come out of the bag from the surface does not stay. Specifically, a method of sandwiching a porous material such as air-permeable paper, cloth, or nonwoven fabric between the contact surfaces of the bag is conceivable.
In addition, when filling the contents and putting the packaging bag according to the present invention into cardboard or the like, or when further packing into the outer bag, the water molecules pass between the molecules of the material so that the moisture that has emerged on the bag surface is likely to evaporate. An easy-to-use material, that is, a material with good moisture permeability may be selected and used for the contact surface. For example, PET, OPP, aluminum film, and the like are poor in moisture permeability, and it is desirable to use PE film, paper material, etc. with good moisture permeability.

  Examples for better understanding of the present invention and its advantages will be shown below, but the present invention is not limited to these examples.

A Verification of discoloration of aluminum surface and prevention of transparency due to hydrophobicity of anchor coat layer (Example 1. Production of packaging bag according to the present invention: AC2 liquid product)
A one-component urethane ink was printed on one side of a biaxially stretched nylon (ON) having a thickness of 15 μm. Next, after applying a two-component isocyanate AC agent on the printed surface side of this stretched nylon, extruded polyethylene (LDPE) with a thickness of 15 μm and a PET film with a thickness of 12 μm with an aluminum layer deposited on one side were laminated by extrusion lamination. . After applying a two-component isocyanate-based AC agent to the PET film side of the resulting laminate, extruded polyethylene (LDPE) with a thickness of 15 μm and linear low density polyethylene (L-LDPE) with a thickness of 25 μm are extrusion laminated. Was further laminated.

The laminated structure of the packaging material thus made is as follows, and a schematic diagram is shown in FIG.
Layer 31: Stretched nylon (ON) 15 μm
Layer 32: Urethane ink (1 liquid)
Layer 33: Isocyanate-based AC agent (2 liquids)
Layer 34: Extruded polyethylene (LDPE) 15 μm
Layer 35: Aluminum vapor deposition layer of aluminum vapor deposition PET Layer 36: PET film of aluminum vapor deposition PET 12 μm
Layer 37: Isocyanate-based AC agent (2 liquids)
Layer 38: Extruded polyethylene (LDPE) 15 μm
Layer 39: Linear low density polyethylene (L-LDPE) 25 μm

  Thereafter, the L-LDPE layer of the packaging material was heat-sealed to form a bag.

(Comparative Example 1. Production of comparative packaging bag)
A one-component urethane ink was printed on one side of a biaxially stretched nylon (ON) having a thickness of 15 μm. Next, a one-pack type polyethyleneimine-based AC agent is applied to the printed surface side of the stretched nylon, and then extruded polyethylene (LDPE) having a thickness of 15 μm and a PET film having a thickness of 12 μm, on which an aluminum layer is deposited, are laminated by extrusion lamination. did. After applying a one-component polyethyleneimine-based AC agent to the PET film surface side of the resulting laminate, extruded polyethylene (LDPE) with a thickness of 15 μm and linear low density polyethylene (L-LDPE) with a thickness of 25 μm are extruded. Further lamination was performed by laminating.

The laminated structure of the packaging material thus made is as follows, and a schematic diagram is shown in FIG.
Layer 41: Stretched nylon (ON) 15 μm
Layer 42: Urethane ink (1 liquid)
Layer 43: Polyethyleneimine AC agent (1 liquid)
Layer 44: extruded polyethylene (LDPE) 15 μm
Layer 45: Aluminum-deposited surface of aluminum-deposited PET Layer 46: PET film of aluminum-deposited PET 12 μm
Layer 47: Polyethyleneimine AC agent (1 liquid)
Layer 48: Extruded polyethylene (LDPE) 15 μm
Layer 49: Linear low density polyethylene (L-LDPE) 25 μm

  Thereafter, the L-LDPE layer of the packaging material was heat-sealed to form a bag.

Prepare three packaging bags obtained as described above for each sample, put about 5cc of each into each sample, seal with the heat sealing method, put the bags together and put them in a nylon / polybag, seal And heated in a constant temperature bath at 80 ° C. for 24 hours.
Samples used in the test are as follows.
water,
Oil (soybean oil),
Acid (vinegar),
Alkali (mechanical cleaner pH 11-12)
Cheese cake (commercially available) 40 g.
* Samples other than cheese cake were absorbed in absorbent cotton and placed in a packaging bag.

The results are shown in Table 1. In the packaging bag of Comparative Example 1, aluminum disappeared in the portions where the bags overlapped for all the samples, but no change was observed in any of the samples in the packaging bag of Example 1.

B Verification of the effect of preventing discoloration and transparency of the aluminum surface due to the hydrophobicity of the ink layer (Example 2. Production of packaging bag according to the present invention: ink two-component product)
A two-component urethane ink was printed on one side of a biaxially stretched nylon (ON) having a thickness of 15 μm. Next, a one-pack type polyethyleneimine-based AC agent is applied to the printed surface side of the stretched nylon, and then extruded polyethylene (LDPE) having a thickness of 15 μm and a PET film having a thickness of 12 μm, on which an aluminum layer is deposited, are laminated by extrusion lamination. did. After applying a one-component polyethyleneimine-based AC agent to the PET film surface side of the resulting laminate, extruded polyethylene (LDPE) with a thickness of 15 μm and linear low density polyethylene (L-LDPE) with a thickness of 25 μm are extruded. Further lamination was performed by laminating.

The laminated structure of the packaging material thus made is as follows, and a schematic diagram is shown in FIG.
Layer 51: Stretched nylon (ON) 15 μm
Layer 52: Urethane ink (two liquids)
Layer 53: Polyethyleneimine AC agent (1 liquid)
Layer 54: extruded polyethylene (LDPE) 15 μm
Layer 55: Aluminum vapor deposition PET aluminum vapor deposition surface layer 56: Aluminum vapor deposition PET PET film 12 μm
Layer 57: Polyethyleneimine AC agent (1 liquid)
Layer 58: extruded polyethylene (LDPE) 15 μm
Layer 59: linear low density polyethylene (L-LDPE) 25 μm

  Thereafter, the L-LDPE layer of the packaging material was heat-sealed to form a bag.

The packaging bag obtained as described above is filled with cheese cake (commercially available product), and five of these are put into an unstretched polypropylene bag (CPP), fixed with cardboard and rubber bands, and in a thermostatic bath at 80 ° C. For 24 hours. There was no change in the appearance of the packaging bag (Table 2).

C Verification of discoloration of aluminum surface due to hydrophobization of outermost layer and prevention of transparency (Example 3. Production of packaging bag according to the present invention: outermost layer OPP)
A one-component urethane ink was printed on one side of 20 μm thick biaxially oriented polypropylene (OPP). Next, a one-pack type polyethyleneimine-based AC agent is applied to the printed surface side of the stretched propylene, and a 15 μm thick extruded polyethylene (LDPE) and a 12 μm thick PET film having an aluminum layer deposited on one side are laminated by extrusion lamination. did. After applying a one-component polyethyleneimine-based AC agent to the PET film surface side of the resulting laminate, extruded polyethylene (LDPE) with a thickness of 15 μm and linear low density polyethylene (L-LDPE) with a thickness of 25 μm are extruded. Further lamination was performed by laminating.

The laminated structure of the packaging material thus made is as follows, and a schematic diagram is shown in FIG.
Layer 61: expanded polypropylene (OPP) 20 μm
Layer 62: Urethane ink (one liquid)
Layer 63: Polyethyleneimine AC agent (1 liquid)
Layer 64: extruded polyethylene (LDPE) 15 μm
Layer 65: Aluminum vapor deposition PET aluminum vapor deposition surface layer 66: Aluminum vapor deposition PET PET film 12 μm
Layer 67: Polyethyleneimine AC agent (1 liquid)
Layer 68: extruded polyethylene (LDPE) 15 μm
Layer 69: linear low density polyethylene (L-LDPE) 25 μm

  Thereafter, the L-LDPE layer of the packaging material was heat-sealed to form a bag.

The packaging bag obtained as described above is filled with cheese cake (commercially available), and five of these are put into an unstretched polypropylene bag (CPP), fixed with cardboard and rubber bands, and the temperatures shown in Table 3 And as time conditions, it heated for 24 hours in the thermostat. As a result, no change was seen in the appearance of the packaging bag (Table 3).

It is a schematic sectional drawing of one Embodiment of the laminated body which comprises the packaging material which concerns on this invention. It is a schematic sectional drawing showing the contact surface in the state where a water | moisture content is hard to evaporate and scatter when a bag is piled up. 1 is a schematic cross-sectional view showing a laminated structure of a packaging material manufactured in Example 1. FIG. 6 is a schematic cross-sectional view showing a laminated structure of a packaging material manufactured in Comparative Example 1. FIG. 3 is a schematic cross-sectional view showing a laminated structure of a packaging material manufactured in Example 2. FIG. 6 is a schematic cross-sectional view showing a laminated structure of a packaging material manufactured in Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st thermoplastic polymer layer 12 Ink layer 13 Hydrophobic anchor coat layer 14 Polyethylene layer 15 Aluminum vapor deposition film layer 16 Anchor coat layer 17 Polyethylene layer 18 Second thermoplastic polymer layer 21, 22, 23 Packaging bag filled with contents 24 Barrier material 31 Stretched nylon (ON)
32 Urethane ink (1 liquid)
33 Isocyanate-based AC agent (2 liquids)
34 Extruded polyethylene (LDPE)
35 Aluminum vapor deposition layer of aluminum vapor deposition PET 36 PET film of aluminum vapor deposition PET 37 Isocyanate AC agent (2 liquids)
38 Extruded polyethylene (LDPE)
39 Linear low density polyethylene (L-LDPE)
41: Stretched nylon (ON)
42: Urethane ink (1 liquid)
43: Polyethyleneimine AC agent (1 liquid)
44: Extruded polyethylene (LDPE)
45: Aluminum vapor deposition surface of aluminum vapor deposition PET 46: PET film of aluminum vapor deposition PET 47: Polyethyleneimine AC agent (1 liquid)
48: Extruded polyethylene (LDPE)
49: Linear low density polyethylene (L-LDPE)
51: Stretched nylon (ON)
52: Urethane ink (2 liquids)
53: Polyethyleneimine AC agent (1 liquid)
54: Extruded polyethylene (LDPE)
55: Aluminum vapor deposition surface of aluminum vapor deposition PET 56: PET film of aluminum vapor deposition PET 57: Polyethyleneimine AC agent (1 liquid)
58: Extruded polyethylene (LDPE)
59: Linear low density polyethylene (L-LDPE)
61: Expanded polypropylene (OPP)
62: Urethane ink (1 liquid)
63: Polyethyleneimine AC agent (1 liquid)
64: Extruded polyethylene (LDPE)
65: Aluminum vapor deposition surface of aluminum vapor deposition PET 66: PET film of aluminum vapor deposition PET 67: Polyethyleneimine AC agent (1 liquid)
68: Extruded polyethylene (LDPE)
69: Linear low density polyethylene (L-LDPE)

Claims (6)

a) a first thermoplastic polymer layer that is hydrophobic;
b) a hydrophobic ink layer composed of a two-component curable urethane-based ink in which the polyol component of the main agent and the polyisocyanate component of the curing agent generate a urethane bond;
c) a hydrophobic anchor coat layer composed of a two-component curable urethane adhesive in which the polyol component of the main agent and the polyisocyanate component of the curing agent generate a urethane bond;
d) a polyethylene layer;
e) an aluminum deposited film layer;
f) an anchor coat layer;
g) a polyethylene layer;
h) a second thermoplastic polymer layer as a sealant;
The packaging material which consists of the laminated body which has the aluminum vapor deposition film layer provided in this order toward the inner surface from the outer surface. e) bonding of the aluminum deposited film layer and b) a ink layer is printed) first thermoplastic polymer layer, by extrusion lamination in which the adhesive c) a hydrophobic anchor coat layer and d) polyethylene layer packaging material according to claim 1 which is performed. The packaging according to claim 1 or 2 , wherein the first thermoplastic polymer layer is composed of a material selected from the group consisting of biaxially oriented polypropylene (OPP), polyethylene terephthalate (PET), and unstretched polypropylene (CPP). Wood. a) packaging material according to claim 1 or 2 constructed of a material selected from a first thermoplastic polymer layer group consisting of biaxially oriented polypropylene (OPP) 及 beauty cast polypropylene (CPP). It is for foodstuffs, The packaging material as described in any one of Claims 1-4 . The packaging bag which filled the content using the packaging material as described in any one of Claims 1-5 .

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