KR102438985B1 - Laminate packing material - Google Patents

Abstract

The laminate packaging material (1) includes a metal foil (11), an insulating layer (14) laminated on at least a portion of the first surface of the metal foil (11), and a metal foil (11) including the insulating layer (14) ), a heat-sealable resin layer (15) laminated on the first surface side, and a protective layer ( 16), wherein the heat-sealable resin layer 15 includes at least one easily peelable part 21 surrounded by a perforation line 20 formed by cutting the heat-sealable resin layer 15, and the easily peelable It is disposed around the portion 21 and is divided into the non-peelable portion 22 not surrounded by the perforated line 20 , and at least the easily peelable portion 21 is provided in a region overlapping the insulating layer 14 .

Description

Laminate packaging material {LAMINATE PACKING MATERIAL}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a laminate packaging material used as a container for an electrical storage device, a container for food or medicine, and the like, and a related technology therefor.

Laminate packaging material is a five-layer laminate in which a heat-sealable resin film, which becomes the inner layer of the container and heat-sealed, is bonded to one side of a metal foil with an adhesive, and a heat-resistant resin film, which becomes the outer layer during packaging, is bonded to the other side with an adhesive. of laminate material is common (refer to Patent Document 1). These laminate packaging materials are used as containers having a three-dimensional storage space by embossing the flat sheet, except for pouches used as flat sheets.

In recent years, with the reduction in thickness and weight of portable devices such as smart phones and tablet terminals, a laminate packaging material used as an exterior body for lithium ion secondary batteries or lithium polymer secondary batteries mounted thereon is also required to be thin and light. As a method of thinning the laminate packaging material, there is a method of reducing the thickness of the material of each layer.

However, when each layer is made thin, the strength of the laminate packaging material is lowered, the barrier properties and moldability due to pinhole generation are lowered, and there arises a problem that the forming of a deep embossed portion becomes difficult.

Further, as a method of reducing the thickness of the exterior body, there is a method of assembling the exterior body with a packaging material having no heat-sealable resin layer, and sandwiching a separately produced heat-sealable resin body for a heat seal around the periphery. According to this method, the heat-sealable resin exists only at the periphery of the exterior body, and the other regions can be made as thin as the thickness of the heat-sealable resin layer (see Patent Documents 2 and 3).

Patent Document 1: Japanese Patent Laid-Open No. 2005-22336 Patent Document 2: Japanese Patent No. 5256990 Patent Document 3: Japanese Patent No. 4354152

However, a packaging material not having a heat-sealable resin layer has poor moldability and may cause scratches or cracks during embossing, making it difficult to form a deep embossed portion. In addition, by using the heat-sealable resin body for heat seal, the number of parts for assembly increases, and workability deteriorates, for example, that alignment between the packaging material and the heat-sealable resin body is required.

In view of the above background art, an object of the present invention is to provide a laminate packaging material having a thickness reduction without reducing moldability and a related technology thereof.

That is, the present invention has the structures described in [1] to [7] below.

[1] metal foil and

an insulating layer laminated on at least a portion of the first surface of the metal foil;

A heat-sealable resin layer laminated on the first surface side of the metal foil comprising the insulating layer phase;

a protective layer formed of a resin film laminated on the heat-sealable resin layer and peelable from the heat-sealable resin layer;

The heat-sealable resin layer includes at least one easily peelable portion surrounded by a perforation line formed by cutting the heat-sealable resin layer, and a non-peelable portion disposed around the easily peelable portion and not surrounded by the perforation line. (non-剝離部) and at least the easily peelable portion is provided in a region overlapping the insulating layer, Laminate packaging material characterized in that.

[2] The adhesive force (f1) between the insulating layer and the heat-sealable resin layer, the adhesive force (f2) between the protective layer and the heat-sealable resin layer, the adhesive force (f3) between the metal foil and the insulating layer, the metal foil and The laminate packaging material according to the preceding item 1, wherein the adhesive force (f4) between the heat-sealable resin layers satisfies the relation f3>f2>f1 and f4>f2>f1.

[3] The metal foil and the heat-sealable resin layer are laminated through an adhesive layer, the metal foil and the insulating layer are laminated through the adhesive layer, and the insulating layer and the heat-sealable resin layer are laminated without passing through the adhesive layer. The laminate packaging material according to the preceding paragraph 1.

[4] The laminate packaging material according to the preceding item 1, wherein the coefficient of kinetic friction of the surface of the protective layer is 1.0 or less.

[5] The laminate packaging material according to the preceding item 1, having a plurality of easily peelable portions.

[6] The laminate packaging material according to the preceding item 1, having an embossed portion recessed toward the protective layer, and an easily peelable portion is present in the embossed portion.

[7] The protective layer of the laminate packaging material according to any one of items 1 to 6 and the easily peelable portion of the heat-sealable resin layer are removed to expose the insulating layer, and the exposed insulating layer is placed in the storage room, A container in which the peeling part protrudes out of the storage room is manufactured,

Inserting a power storage device into the storage chamber of the container,

A method for manufacturing an electrical storage device, wherein the non-peelable portion of the container is heat-sealed to seal the electrical storage device in the storage chamber.

In the laminate packaging material described in [1] above, since the protective layer is laminated on the heat-fusible resin layer, high moldability can be obtained and a deep embossed portion can be formed. In addition, the protective layer can prevent scratches and chemicals during molding. And, when the protective layer is pulled, the protective layer is peeled from the heat-sealable resin in the non-peelable part of the heat-sealable resin layer, and the easy-to-peel part cut by the perforation line is peeled from the insulating layer, so the ease of the protective layer and the resin layer When the peeling part is removed, the non-peelable part of the heat-fusible resin layer will remain in the periphery of the insulating layer. By using the packaging material from which the protective layer and the easily peelable part are removed as a structural member of a container, electrical insulation is maintained by the inner surface of a container by an insulating layer, and a container can heat-seal in a non-peelable part.

According to the above, high moldability is realized, and the thickness and weight reduction of the packaging material can be achieved by removing the protective layer and the easily peelable portion, and further, the thickness and weight reduction of the product using the packaging material as a container can be achieved.

In the laminate packaging material described in the above [2], the easily peelable portion of the protective layer and the heat-sealable resin layer can be easily removed by setting the bonding force between the layers.

In the laminate packaging material described in [3] above, the metal foil and the heat-sealable resin, the metal foil and the insulating layer are bonded to each other with strong adhesive force through an adhesive layer, while the insulating layer and the heat-sealable resin layer are laminated without an adhesive. Therefore, the easily peelable part on an insulating layer can be peeled easily.

Since the laminate packaging material described in [4] has good sliding of the molding tool on the surface of the protective layer, a deep embossed portion can be formed.

Since the laminate packaging material described in the above [5] has a plurality of easily peelable portions, the production efficiency is good.

Since the laminate packaging material described in [6] has an embossed portion, it is useful as a material for a container having an enlarged internal volume.

According to the manufacturing method of the electrical storage device as described in said [7], since a container is produced from the packaging material from which the easily peeling part of the protective layer and heat-sealable resin layer was removed, thickness reduction and weight reduction can be aimed at. In particular, when a container is manufactured from a packaging material having an embossed portion, the deep embossed portion can be formed because molding is performed in a state in which the easily peelable portions of the protective layer and the heat-sealable resin layer are attached.

1A is a plan view of one embodiment of the laminate packaging material of the present invention.
Fig. 1B is a cross-sectional view taken along line 1B-1B of Fig. 1A.
2 is a cross-sectional view of another embodiment of the laminate packaging material of the present invention.
3 is a cross-sectional view of another embodiment of the laminate packaging material of the present invention.
4 is a cross-sectional view of a laminate packaging material having an embossed portion.
Fig. 5 is a perspective view of one embodiment of an electrical storage device using the laminate packaging material of the present invention.

[Laminate packaging material]

In the laminate packaging material 1 of FIG. 1A and FIG. 1B, on the first surface side of the metal foil 11, an insulating layer 14 is laminated in the central portion, and the entire area including the insulating layer 14 A heat-sealable resin layer 15 is laminated thereon, and a protective layer 16 made of a peelable resin film is laminated on the heat-sealable resin layer 15 . On the second surface of the metal foil 11, a heat-resistant resin layer 13 serving as an outer layer of the container is laminated through an adhesive layer 12 and adhered.

In the heat-sealable resin layer 15 , an easily peelable portion 21 surrounded by a perforation line 20 is formed in a region overlapping the insulating layer 14 , and a region around the easily peelable portion 21 . The silver is a non-peelable portion 22 that is not surrounded by the perforation line. The perforated line 20 is a sewing machine scale in which a cut penetrating the heat-sealable resin layer 15 continues in a dotted shape. By the perforated line 20, the easily peelable portion 21 is intermittently connected as a part of the heat-sealable resin layer 15, but the cut portion of the sewing machine scale serves as a trigger and can be easily removed.

In the laminate packaging material 1, the protective layer 16 is peelable with respect to the heat-sealable resin layer 15, and the heat-sealable resin layer 15 can be peeled off with a perforation line 20, so that protection When the layer 16 is pulled out, the protective layer 16 is peeled from the heat-sealable resin layer 15 in the non-peelable portion 22 , and the heat-sealable resin layer 15 is separated from the easily peelable portion 21 by the perforation line. While cut according to (20), the cut out heat-fusible resin layer (15) adheres to the protective layer (16) and peels off from the insulating layer (14) together with the protective layer (16). By this peeling, in the laminate packaging material 1, the insulating layer 14 is exposed, and the non-peelable part 22 of the heat-fusible resin layer 15 remains around the exposed insulating layer 14. becomes The exposed insulating layer 14 forms the inner surface of the container, and the surrounding non-peelable part 22 forms a heat seal part of the container. Since the said non-peelable part 22 is integral with a packaging material, the operation|work such as assembling the resin for heat seals is unnecessary, and a container can be assembled easily.

Moreover, when the protective layer 16 is peeled off between the heat-fusible resin layer 15 and the easily peelable part 21 in the peeling operation|work mentioned above, after peeling the protective layer 16, the easy peeling part 21 ) should be removed. Since the easily peelable part 21 is enclosed by the perforation line 20, if the easily peelable part 21 is pulled, it can peel between the insulating layer 14 and the.

In the laminate packaging material 1, the bonding force between the respective layers on the first surface side of the metal foil 11 of the laminate packaging material 1 is not uniform. It is preferable to set it weakly. The insulating layer 14 is a layer that is not removed because the entire area is adhered to the metal foil 11 . The heat-sealable resin layer 15 is removed from the easily peelable part 21 and is not removed from the non-peelable part 22 . The protective layer 16 removes the entire area. Therefore, the adhesive force between the insulating layer 14 and the heat-sealable resin layer 15 is f1, the adhesive force between the protective layer 16 and the heat-sealable resin layer 15 is f2, and the metal foil 11 and When the adhesive force between the insulating layers 14 is f3 and the adhesive force between the metal foil 11 and the heat-sealable resin layer 15 is f4, f3>f2>f1, f4>f2>f1 is satisfied, It is preferable to have When the adhesive force (f1, f2, f3, f4) between the respective layers satisfies the above relationship, the protective layer 16 and the easily peelable portion 21 are smoothly removed by pulling the protective layer 16 . can do. In addition, when f2>f1, the easily peelable part 21 adheres to the protective layer 16 and peels from the insulating layer 14, so the easy peeling part 21 is also removed by pulling the protective layer 16. can do.

Since the heat-sealable resin layer 15 is a layer used for sealing by a heat seal disposed to face each other in a packaging container, it is a necessary layer at the periphery of the container. On the one hand, the inner surface of the container needs to have electrical insulation, and the metal foil 11 needs to be coat|covered with the insulator. In order to form a heat seal part with high sealing property, a predetermined thickness is required, and the thickness is thicker than the thickness required for obtaining electrical insulation. In addition, in the laminate packaging material 1, it is preferable that the metal foil 11 is coated with a resin layer having ductility to form a deeper embossed portion to improve the moldability, but the number required for improving the moldability The thickness of the formation is also thicker than the thickness required to obtain electrical insulation. In addition, in order to prevent scratches due to contact with a molding tool during molding and to prevent erosion due to adhesion of chemicals, it is preferable that the heat-fusible resin layer 15 is coated with the protective layer 16 to protect it.

The laminate packaging material 1 can obtain high formability by molding the embossed portion in a state where the protective layer 16 is attached, and can form a deep embossed portion, and the protective layer 16 when using the packaging container. And by removing the easily peelable part 21 of the heat-sealable resin layer 15, thickness reduction and weight reduction can be aimed at.

[Other Lamination Forms of Laminate Packaging Materials]

The laminate packaging material of the present invention is not limited to the laminated form of FIG. 1A and FIG. 1B, and various modifications are possible.

The lamination form on the second surface side of the metal foil 11 is not limited, and the packaging material exposed on the second surface is also included in the technical scope of the present invention. However, by covering the second surface of the metal foil 11 with a resin layer, it is possible to protect the metal foil to improve weather resistance and improve moldability. In addition, the coating layer is not limited to the heat resistant resin layer 13 and the adhesive bond layer 12 of embodiment, It can also replace with a thin overcoat layer. The thin overcoat layer has a small effect on improving the formability, but contributes to the reduction in thickness and weight of the packaging material.

In the heat-sealable resin layer 15, the perforated line 20, which is the boundary between the easily peelable part 21 and the non-peelable part 22, is formed in the region overlapping the insulating layer 14, and the easily peelable part ( After the removal of 21), the metal foil 11 is not exposed. In order to satisfy this condition, the perforated line 20 is formed inside the outline of the insulating layer 14 as shown in Figs. 1A and 1B, or the perforated line as shown in Fig. 2 . (20) is formed at the same position as the outline of the insulating layer (14). Further, the insulating layer 14 may be laminated on the entire surface of the metal foil 11 . When the insulating layer 14 is laminated on the entire surface of the metal foil 11 , it is not necessary to align the perforated line 20 with the insulating layer 14 , and the easily peelable portion 21 and the insulating layer 14 are not required. ), there is also no fear of exposure of the metal foil 11 due to position shift. Moreover, the interposition of the insulating layer 14 between the heat sealable resin layer 15 (non-peelable part 22) and the metal foil 11 in a heat seal part does not interfere with a heat seal.

In addition, the heat-fusible resin layer 15 and the insulating layer 14 are both resins, and without using an adhesive, using the adhesiveness of the resin itself, lamination on the metal foil 11 using a heat roller or the like It can be pasted together, but it can also be pasted with a strong adhesive force using an adhesive. Since the bonding portion between the metal foil 11 and the heat-sealable resin layer 15 and the bonding portion between the metal foil 11 and the insulating layer 14 is not peeled off, it is also preferable to strongly adhere using an adhesive.

The laminate packaging material 2 of FIG. 2 has an adhesive layer 17 on the first surface of the metal foil 11, the metal foil 11 and the insulating layer 14, the metal foil 11 and the heat-sealable resin layer 15 ) is strongly bonded through the adhesive layer 17 . Further, the adhesive layer 17 does not exist between the insulating layer 14 and the heat-sealable resin layer 15 . As described above, since the preferable relationship of the adhesive force between the layers is f3>f2>f1, f4>f2>f1, the adhesive force f3 between the metal foil 11 and the insulating layer 14 by the adhesive layer 17 ), when the adhesive force f4 between the metal foil 11 and the heat-sealable resin layer 15 is strengthened, the adhesive force between the insulating layer 14 and the heat-sealable resin layer 15 without an adhesive layer interposed therebetween. Since (f1) becomes relatively weak, a favorable strong-weak relationship of adhesive force can be formed.

In addition, in the laminate packaging material 3 of FIG. 3, the adhesive layer 17 is provided only between the metal foil 11 and the heat-fusible resin layer 15, and the metal foil 11 and the insulating layer 14 are It is a laminated aspect which does not provide the adhesive bond layer 17 in between.

[Constituting material of laminate packaging material]

Although this invention does not limit the material of a laminate packaging material, the following materials are mentioned as a preferable material.

(metal foil)

The metal foil 11 plays a role in providing the laminate packaging material with gas barrier properties that prevent the penetration of gas or moisture generated by the reaction of oxygen and electrolyte. aluminum foil, copper foil, nickel foil, stainless foil, or clad foil thereof, annealed foil or micro-annealed foil thereof, and the like. Moreover, it is also preferable to use the metal foil plated with conductive metals, such as nickel, tin, copper, and chromium, for example, plated aluminum foil. In addition, the thickness of the metal foil 11 is preferably 7 to 150㎛.

Moreover, it is also preferable that the chemical conversion film is formed in the said metal foil 11. As shown in FIG. The said chemical conversion film is a film formed by performing chemical conversion treatment on the surface of metal foil, and when such a chemical conversion treatment is performed, corrosion of the metal foil surface by electrolyte solution can fully be prevented. For example, chemical conversion treatment is performed on metal foil by performing the following processing. That is, on the surface of the metal foil which performed the degreasing process,

1) phosphate and

chromic acid,

An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and non-metal salts of fluorides

2) phosphate and

At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;

An aqueous solution of a mixture containing at least one compound selected from the group consisting of chromic acid and chromium (III) salts

3) phosphate and

At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;

at least one compound selected from the group consisting of chromic acid and chromium (III) salts;

An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and non-metal salts of fluorides

After apply|coating the aqueous solution in any one of said 1) - 3) to the surface of metal foil, it is dried to perform chemical conversion treatment.

As for the said chemical conversion film, 0.1 mg/m<2> - 50 mg/m<2> is preferable as chromium adhesion amount (per one side), and 2 mg/m<2> - 20 mg/m<2> is especially preferable.

(Heat-resistant resin layer)

As the heat-resistant resin constituting the heat-resistant resin layer 13, a heat-resistant resin that does not melt at the heat-sealing temperature at the time of heat-sealing is used. As the heat-resistant resin, it is preferable to use a heat-resistant resin having a melting point higher than the melting point of the heat-sealable resin constituting the heat-sealable resin layer 15 by 10°C or higher, and 20°C or higher than the melting point of the heat-sealable resin. It is particularly preferable to use a heat-resistant resin having a high melting point. For example, it is preferable to use a stretched polyamide film, a stretched polyester film, a stretched polyolefin film, etc. Among them, it is particularly preferable to use a biaxially stretched polyamide film, a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, or a biaxially stretched polyethylene naphthalate (PEN) film. do. In addition, the heat-resistant resin layer 13 may be formed as a single layer, or, for example, is formed of a multilayer (such as a multilayer made of a stretched PET film/stretched nylon film) made of a stretched polyester film/stretched polyamide film. good to be The thickness of the heat-resistant resin layer 13 is preferably 5 µm to 100 µm.

The heat-resistant resin layer 13 may be bonded to the metal foil 11 by using the resin's own adhesiveness, but in the case of bonding through the adhesive layer 12, the adhesive is made of a polyester urethane-based adhesive and a polyether urethane-based adhesive. It is preferable to use at least one adhesive selected from the group. It is preferable that the thickness of the said adhesive bond layer 12 is set to 0.5 micrometer - 5 micrometers.

When replacing the heat resistant resin layer 13 with an overcoat layer, the resin constituting the overcoat layer is preferably a resin having heat resistance, and preferably contains at least one of a thermosetting resin, a photocurable resin, and a two-component curable resin. do. Since these resins can easily control the curing reaction rate depending on the use environment of the resin such as temperature or light intensity, the lead time can be shortened by adjusting the curing reaction rate according to the contents of the work. For example, during application of the resin, a thin layer can be efficiently formed over a large area by slowing the curing reaction rate and maintaining the coatable state for a long time. Moreover, after apply|coating resin, an overcoat can be completed in a short time by speeding up the curing reaction rate. Acid-modified polyolefin-based resins can be exemplified as thermosetting resins, acrylate resins and epoxy-based resins can be exemplified as photocurable resins, and urethane-based resins and epoxy-based resins can be exemplified as two-component curable resins .

The thickness of the overcoat layer is preferably 0.5 µm to 5 µm. If it is less than 0.5 μm, the protective effect on the metal foil 11 is small, and if it exceeds 5 μm, the effect of reducing the thickness and weight of the packaging material is small. Especially preferable thickness is 1 micrometer - 3 micrometers.

(Heat-sealable resin layer)

The heat-sealable resin constituting the heat-sealable resin layer 13 is at least one heat-sealable resin selected from the group consisting of polyethylene, polypropylene, olefinic copolymers, acid-modified products thereof, and ionomers. It is preferable to be comprised by the unstretched film formed. The thickness of the heat-fusible resin layer 13 is preferably set to 20 µm to 150 µm.

(insulation layer)

It is a condition that the said insulating layer 14 has insulation, and a biaxially stretched polyamide film, a biaxially stretched polyester film, a biaxially stretched polyolefin film, etc. are preferable. The thickness of the insulating layer 14 is preferably set to 5 μm to 15 μm in order to achieve thickness reduction while ensuring insulation of the packaging material.

Further, when the adhesive layer 17 is interposed between the metal foil 11 and the insulating layer 14 and between the metal foil 11 and the heat-sealable resin layer 15, the adhesive is an olefinic adhesive. , it is preferable to use an acrylic adhesive, an epoxy adhesive, or the like. In addition, the adhesive layer 17 and the insulating layer 14 may be replaced with a layer having insulation, solvent resistance, and moisture resistance, for example, a coating layer made of a polyolefin resin, an acrylic resin, an epoxy resin, etc. , the thickness is preferably 0.5 µm to 10 µm.

(protective layer)

As the protective layer 16, it is preferable to use a polyolefin film, a polyester film, a polyamide film, or the like. The thickness of the protective layer 16 is preferably 10 μm to 150 μm. If it is less than 10 micrometers, the moldability improvement effect at the time of embossing part shaping|molding is small. Moreover, since sufficient moldability can be obtained if there exists a thickness of 150 micrometers, an excessive thickness becomes unnecessary. A particularly preferred thickness is from 20 µm to 60 µm.

In addition, since the protective layer 16 is a layer in direct contact with a forming tool such as drawing at the time of forming the embossed portion, it is preferable that the forming tool has a slippery surface so as not to interfere with plastic deformation. From such a viewpoint, the surface of the protective layer 16 preferably has a coefficient of kinetic friction prescribed by JIS K7125 (1999) of 1.0 or less, and more preferably 0.6 or less.

(Etc)

The laminate packaging material of the present invention includes a layer and a portion to be finally removed, and the adhesive force between the layers can be adjusted by appropriately using a release agent, a release paper, an adhesive, or the like. For example, the adhesive force f1 between the insulating layer 14 and the heat-sealable resin layer 15 is preferably the weakest, but when both are resins and it is difficult to peel due to the adhesiveness (adhesiveness) of the resin itself can actively weaken the adhesive force f1 by applying a release agent between them, or by inserting a release paper therebetween. When the adhesive force f1 between the insulating layer 14 and the heat-sealable resin layer 15 becomes weak, the difference between the adhesive force f2 between the protective layer 16 and the heat-sealable resin layer 15 increases, It becomes easy to stick the easily peelable part 21 to the protective layer 16, and to remove it together with the protective layer 16. As shown in FIG.

In addition, the protective layer 16 can be pasted using the adhesiveness (adhesiveness) of the protective layer 16 and the heat-sealable resin layer 15 itself. (f2) can be adjusted.

[Manufacturing method of laminate packaging material]

A laminate packaging material can be produced by laminating each layer so that it may become the lamination|stacking form shown. An example of the manufacturing process of the laminate packaging material 1 of FIG. 1A and FIG. 1B is shown below. In addition, the laminate packaging material of this invention is not limited to performing pasting of each layer in the following order, The order of pasting can be set arbitrarily.

(1) An adhesive layer 12 is formed by applying an adhesive to the second surface of the metal foil 11 .

(2) A heat-resistant resin layer 13 is laminated on the second surface of the metal foil 11 through the adhesive layer 12, and the metal foil 11 and the heat-resistant resin layer 13 are bonded together.

(3) The insulating layer 14 is laminated using a hot roll at a required position on the first surface of the metal foil 11 .

(4) A heat-fusible resin layer 15 is laminated on the entire first surface side of the metal foil 11 using a heat roll.

(5) A perforated line 20 is formed in a region overlapping the insulating layer 14 of the laminated heat-sealable resin layer 15, and the heat-sealable resin layer 15 is easily peeled off surrounded by the perforated line 20 It divides into the part 21 and the non-peelable part 22 which is not surrounded by the perforation line 20. The perforated line 20 is formed by cutting into the heat-sealable resin layer 15 with a tool such as a Thomson blade or a Pinnacle blade, a laser cutter, or a hot knife. The perforated line 20 is not limited to the sewing machine scale which penetrated the heat-fusible resin layer 15 . As another perforation line, the notch cut in to the middle of the thickness of a resin layer can be illustrated. A single line may be sufficient as the said notch, and the dotted line which continued short notches may be sufficient as it. In addition, even if the easily peeling part 21 is completely cut|disconnected, if it remains in a laminate packaging material, the cut line is included in the perforation line in this invention.

(6) A protective layer 16 is laminated on the heat-fusible resin layer 15 using a heat roll.

In addition, in the case of manufacturing the laminate packaging material 2 of FIG. 2 , an adhesive layer 17 is formed by applying an adhesive to the first surface of the metal foil 11 between the steps (2) and (3) described above. insert process. In addition, in the case of manufacturing the laminate packaging material 3 of Fig. 3, between the above-described steps (3) and (4), an adhesive is applied to the area except for the insulating layer 14 on the first surface of the metal foil 11. The process of forming the adhesive layer 17 by coating is inserted.

In addition, when forming an overcoat layer on the 2nd surface of the metal foil 11, it replaces with the process of said (1) (2), The resin for overcoat layer is apply|coated, and it is dried.

The laminate packaging material 1 may be produced in a size equivalent to a container having one easily peelable portion 21 , or may be produced as a large packaging material having a plurality of easily peelable portions 21 or a long packaging material. In the manufacture of a large-size packaging material and a long-size packaging material, since each process is integrated and performed, manufacturing efficiency is good. In addition, since the packaging material can be wound and stored in a roll shape, storage management is easy. Large-size packaging materials and long-size packaging materials are cut into a shape in which each easily peelable part 21 is surrounded by the non-peelable part 22 and is used.

The produced laminate packaging material 1 forms an embossing part by drawing processing etc. if necessary. Fig. 4 shows a laminate packaging material 4 in which a flat sheet laminate packaging material 1 is molded to form an embossed portion 30 and a flange 31 therearound. The embossed portion 30 is formed to protrude toward the heat-resistant resin layer 13, so that the heat-resistant resin layer 13 has a convex surface and the protective layer 16 has a concave surface. Such a laminate packaging material 4 is useful as a material for a container whose internal volume is enlarged by the embossed portion 30 .

In addition, various information can also be printed on the protective layer 16 of the laminate packaging material 1 produced. Although the protective layer 16 is a layer which is finally peeled off, these processes can be assisted by printing the cutting position, the shaping|molding position of an embossing part, etc. In addition, by printing the packaging material information, it is possible to assist in the management of the packaging material.

[Power storage device and manufacturing method thereof]

The laminate packaging material of the present invention is used as a material for containers for electrical storage devices and containers for food and pharmaceutical products. The electrical storage device 5 of FIG. 5 is an example in which the laminate packaging material of the present invention is used as the material of the container 40 .

The container 40 includes a container body 41 made of a laminate packaging material 4 having an embossed portion 30 and a flange 31 in FIG. It is comprised by the cover plate 42 which consists of the laminated packaging material 1 of a sheet, and the space enclosed by the embossing part 30 of the container main body 41 and the cover plate 42 is used as the storage room 43. As shown in FIG. The laminate packaging materials 1 and 4 constituting the container body 41 and the cover plate 42 have a storage compartment ( The insulating layer 14 is exposed on the inner surface of 43). In addition, the non-peelable portion 22 of the heat-fusible resin layer 15 is present on the flange 31 of the container body 41 , and overlaps the flange 31 of the container body 41 in the cover plate 42 . The non-peelable part 22 of the heat-fusible resin layer 15 exists also in a losing part.

The power storage device body 50 is housed in the storage chamber 43 of the container 40 . A tab lead 51 for a positive electrode and a tab lead 52 for a negative electrode are respectively connected to the positive electrode and the negative electrode of the power storage device body 50, and a container body 41 and a cover plate ( The overlapping portion of the periphery of the flange 31 and the cover plate 42 of the container body 41 is heated in a state where the tab lead 51 for the positive electrode and the tab lead 52 for the negative electrode are drawn out between the 42 , A heat seal portion is formed in which both non-peelable portions 22 (heat-sealable resin layer 15) are fused.

In the power storage device 5 , the heat-sealable resin layer 15 is removed from the inner surface of the storage chamber 43 of the container 40 to achieve a reduction in thickness and weight. In addition, since the molding of the embossed part 30 of the container body 41 is performed in the state in which the protective layer 16 and the heat-fusible resin layer 15 are pasted, the deep embossed part 30 can be molded. have.

In the electrical storage device using the laminate packaging material of the present invention, the shape of the container, the shape of the electrical storage device main body, the position of the tab lead, the method of energizing the stored electrical storage device and the outside are not limited at all. As long as the laminate packaging material of the present invention is used as the material of the container, it falls under the present invention. Further, a power storage device using a pouch-type container having no embossed portion is also included in the present invention.

[Example]

As Examples 1 to 4, a thin overcoat layer was formed instead of the heat-resistant resin layer 13 and the adhesive layer 12 on the second side of the metal foil 11 of the laminate packaging material 3 of Fig. 3, and the first side A laminate packaging material was manufactured using the protective layer 16 having different coefficients of dynamic friction. The protective layer 16 is a thing roughened so that the surface of the resin film of the material and thickness of Table 1 may become the described dynamic friction coefficient. Except for the protective layer 16, the following common materials were used.

Metal foil 11: Aluminum foil of A8079 classified as JIS H4160, thickness 40㎛

Overcoat layer: epoxy resin layer, thickness 3㎛

Insulation layer 14: biaxially stretched polypropylene film, thickness 10㎛

Heat-sealable resin layer (15): unstretched propylene film, thickness 40㎛

Adhesive layer 17: polyolefin adhesive, thickness 2㎛

The protective layer 16 used in each example is as shown in Table 1, JIS

Table 1 shows the coefficient of kinetic friction measured in accordance with K7125 (1999).

The laminate packaging material 1 of Examples 1-4 was produced by the following method.

(1) An overcoat layer was laminated on the second surface of the metal foil 11 .

(2) In the center of the 1st surface of the said metal foil 11, the insulating layer 14 of 55 mm x 35 mm was pasted using the hot roll.

(3) On the first surface of the metal foil 11 , an adhesive layer 17 was formed by applying an adhesive with a gravure roll to an area except for the insulating layer 14 .

(4) The heat-fusible resin layer 15 was pasted together on the whole surface of the 1st surface side of the said metal foil 11. As shown in FIG. Accordingly, the insulating layer 14 is directly laminated on the metal foil 11 , and the heat-fusible resin layer 15 is laminated on the metal foil 11 through the adhesive layer 17 .

(5) In the heat-sealable resin layer 15 , a perforated line 20 was formed along the outline of the insulating layer 14 and divided into an easily peelable part 21 and a non-peelable part.

(6) A protective layer 16 was laminated on the heat-fusible resin layer 15 using a heat roll.

As a comparative example, a laminate packaging material without the protective layer 16 was produced by the steps of (1) to (4) using a material common to the example.

For the laminate packaging materials of Examples 1 to 4 and Comparative Examples, a molding test for forming an embossed portion (see FIG. 4 ) by deep drawing molding was performed to evaluate the moldability.

A tool for deep drawing molding includes a punch for forming the inner shape of an embossed part by press-fitting a laminate packaging material, a dice having a rectangular hole through which the laminate packaging material press-fitted into the punch flows in, and the same as the hole of the dice. It has a rectangular hole of dimensions and is provided with a blank holder for pressing the laminate packaging material around the hole. The dimensions of the top surface of the punch are 55 mm x 35 mm.

In deep drawing molding, the protective layer 16 (Examples 1 to 4) or the heat-fusible resin layer 15 (Comparative Example) of the laminate packaging material is placed on the top surface of the punch, and the convex surface of the embossed portion is formed with a heat-resistant resin layer ( 13), and the concave surface was a protective layer (Examples 1 to 4) or a heat-fusible resin layer 15 (comparative example), and the drawing depth (height of the embossed portion) was changed. Then, the occurrence of pinholes and cracks in the corners of the embossed part of the molded product was investigated, and the depth of the limit at which these did not occur was set as the maximum molding depth of the laminate packaging material. Table 1 indicates the molding depth.

[Table 1]

From the above test results, it was confirmed that the formability was improved by providing the protective layer, and a deeper embossed portion could be molded. In addition, it was confirmed that high formability was obtained by lowering the coefficient of kinetic friction of the protective layer.

Further, by pulling the end of the protective layer 16 of the laminate packaging material after molding in Examples 1 to 4, the easily peelable portion 21 of the heat-sealable resin layer 15 is insulated together with the protective layer 16. It was peeled off from the layer (14).

This application is accompanied by the priority claim of Japanese Patent Application No. 2016-9382 for which it applied on January 21, 2016, The content of an indication constitutes a part of this application as it is.

The terms and expressions used herein are used for the purpose of description and not to be construed as limiting, nor do they exclude any equivalents of the features shown and recited herein, and are not intended to be within the claimed scope of the invention. It must be recognized that various modifications in

(Industrial Applicability)

The laminate packaging material of the present invention can be used as a container material for which thickness reduction and weight reduction are required.

1, 2, 3, 4: Laminate packaging
5: power storage device
11: metal foil
12: adhesive layer
13: heat-resistant resin layer
14: insulating layer
15: heat-sealable resin layer
16: protective layer
20: perforated line
21: easy peeling part
22: non-peelable part
30: embossed part
40 : courage
43: storage room
50: power storage device body

Claims (7)

metal foil,
an insulating layer laminated on at least a portion of the first surface of the metal foil;
A heat-sealable resin layer laminated on the first surface side of the metal foil comprising the insulating layer phase;
a protective layer formed of a resin film laminated on the heat-sealable resin layer and peelable from the heat-sealable resin layer;
The heat-sealable resin layer is divided into at least one easily peelable part surrounded by a perforation line formed by cutting the heat-sealable resin layer, and a non-peelable part disposed around the easily peelable part and not surrounded by the perforation line, at least the A laminate packaging material characterized in that the easily peelable portion is provided in a region overlapping the insulating layer. According to claim 1,
Adhesive force (f1) between the insulating layer and the heat-sealable resin layer, the adhesive force (f2) between the protective layer and the heat-sealable resin layer, the adhesive force (f3) between the metal foil and the insulating layer, and heat-sealability with the metal foil The adhesive force f4 between the resin layers satisfies the relationship f3>f2>f1, f4>f2>f1, The laminated packaging material characterized by the above-mentioned. According to claim 1,
The metal foil and the heat-sealable resin layer are laminated through an adhesive layer, the metal foil and the insulating layer are laminated through an adhesive layer, and the insulating layer and the heat-sealable resin layer are laminated without passing through the adhesive layer. laminate packaging material. According to claim 1,
Laminate packaging material, characterized in that the coefficient of kinetic friction of the surface of the protective layer is 1.0 or less. According to claim 1,
A laminate packaging material having a plurality of easily peelable portions. According to claim 1,
Laminate packaging material, characterized in that it has an embossed portion recessed toward the protective layer, and an easily peelable portion is present in the embossed portion. The easily peelable part of the protective layer and heat-fusible resin layer of the laminate packaging material according to any one of claims 1 to 6 is removed to expose the insulating layer, and the exposed insulating layer is placed in the storage room, and the non-peelable part is in the storage room Produce a container that protrudes outward,
Inserting a power storage device into the storage chamber of the container,
A method for manufacturing an electrical storage device, wherein the non-peelable portion of the container is heat-sealed to seal the electrical storage device in the storage chamber.

Images