JP2017136756A - Laminated packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated packaging material which achieves thinning without lowering moldability.SOLUTION: There is provided a laminated packaging material 1 which has a metal foil 11, an insulating adhesive layer 12 laminated on a first surface of the metal foil 11, a release agent layer 13 laminated on a partial region of the insulating adhesive layer 12 and a heat-fusible resin layer 14 laminated on the insulating adhesive layer 12 on the upper part of the release agent layer 13, where the heat-fusible resin layer 14 is divided into at least one easy-to-peel portion 21 surrounded by a cutting line 20 formed by cutting the heat-fusible resin layer 14 and a non-peelable portion 22 that is arranged in the periphery of the easy-to-peel portion 21 and is not surrounded by the cutting line 20, and the easy-to-peel portion 21 is provided along a contour of the release agent layer 13.SELECTED DRAWING: Figure 1B

Description

  The present invention relates to a laminate packaging material used as a container for an electricity storage device, a container for food, medicine, etc. and related technology.

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

  In recent years, with the reduction in thickness and weight of portable devices such as smartphones and tablet terminals, the laminate packaging materials used as the exterior of lithium ion secondary batteries and lithium polymer secondary batteries mounted on these devices are also thin and light. It has been demanded. As a method of reducing the thickness of the laminate packaging material, there is a method of reducing the thickness of each layer material.

  However, if each layer is made thinner, the strength of the laminate wrapping material is lowered, and the barrier property and moldability due to the occurrence of pinholes are lowered, making it difficult to form a deep embossed portion.

  Further, as a method for reducing the thickness of the exterior body, there is a method in which the exterior body is assembled with a packaging material that does not have a heat-sealable resin layer, and a heat-sealable heat-sealable resin body separately prepared at the peripheral portion is sandwiched. According to this method, the heat-fusible resin body is present only at the periphery of the exterior body, and the other regions can be made thinner by the thickness of the heat-sealing resin layer (see Patent Documents 2 and 3). ).

JP 2005-22336 A Japanese Patent No. 5256990 Japanese Patent No. 4354152

  However, a packaging material that does not have a heat-fusible resin layer has poor moldability and may cause scratches and cracks during embossing, making it difficult to mold deep embossed portions. In addition, the use of a heat-sealing resin body for heat sealing increases the number of parts to be assembled, and the workability of the packaging material and the heat-sealing resin body becomes necessary.

  In view of the above-described background art, an object of the present invention is to provide a laminate packaging material and a related technique that are thinned without reducing moldability.

  That is, this invention has the structure as described in following [1]-[7].

[1] metal foil;
An insulating adhesive layer laminated on the first surface of the metal foil;
A release agent layer laminated on a partial region of the insulating adhesive layer;
A heat-fusible resin layer laminated on an insulating adhesive layer including the release agent layer,
The heat-fusible resin layer includes at least one easily peelable portion surrounded by a cut line formed by cutting the heat-fusible resin layer, and is disposed around the easy peelable portion to form a cut line. A laminate packaging material, which is divided into non-exposed non-exfoliating parts, and the easy exfoliating part is provided along the outline of the release agent layer.

  [2] The laminate packaging material according to item 1, further comprising a protective layer made of a resin film laminated on the heat-fusible resin layer and peelable from the heat-fusible resin layer.

  [3] Adhesive force f1 between the insulating adhesive layer and the heat-fusible resin layer, adhesive force f2 between the insulating adhesive layer and the release agent layer, and the release agent layer and heat-sealing The laminate packaging material according to item 1, wherein the adhesive force f3 between the adhesive resin layers satisfies a relationship of f1> f2 and f3> f2.

  [4] Adhesive force f1 between the insulating adhesive layer and the heat-fusible resin layer, adhesive force f2 between the insulating adhesive layer and the release agent layer, and the release agent layer and heat-sealing 3. The laminate according to item 2, wherein the adhesive force f3 between the adhesive resin layers and the adhesive force f4 between the heat-fusible resin layer and the protection satisfy a relationship of f1> f4> f2 and f3> f4> f2. Packaging material.

  [5] The laminate packaging material according to any one of items 1 to 4, which has a plurality of easily peelable portions.

  [6] The laminate packaging material according to any one of items 1 to 5 above, wherein the laminate packaging material has an embossed portion recessed on the heat-fusible resin layer side, and an easily peelable portion exists in the embossed portion.

[7] The easily peelable portion of the heat-fusible resin layer of the laminate packaging material described in any one of the preceding items 1 to 6 is removed to expose the insulating adhesive layer or the release agent layer, Create a container in which the exposed insulating adhesive layer or release agent layer faces the storage chamber and the non-peeling portion protrudes outside the storage chamber,
Inserting an electricity storage device into the storage chamber of the container,
A method of manufacturing an electricity storage device, wherein the non-exfoliation part of the container is heat-sealed to seal the electricity storage device in a storage chamber.

  The laminate packaging material according to the above [1] can be formed with the heat-fusible resin layer, so that an embossed portion can be formed while protecting the laminate packaging material from scratches and the like. Moreover, since the insulating adhesive layer is covered with the heat-fusible resin layer, it is possible to prevent the insulating resin layer from being cracked by molding. And since the easy peeling part is weakened in adhesive strength with the insulating adhesive layer by the release agent layer, pulling the easy peeling part peels off the easy peeling part from the insulating adhesive layer and cuts the cut line Then, the insulating adhesive layer or the release agent layer is exposed. On the other hand, the non-peeling part around the easy-peeling part is strongly bonded to the insulating adhesive layer, and the tearing line that is the boundary line of the easy-peeling part is cut off. Stay on. By using the packaging material from which the easily peelable part has been removed as a component of the container, the inner surface of the container is kept electrically insulated by the insulating adhesive layer, and the container is heat sealed by the heat-sealing resin layer of the non-peeled part. By doing so, the inclusion can be enclosed.

  As described above, the laminate packaging material can be protected during processing, and the product using the packaging material as a container can be reduced in thickness and weight.

  In the laminate packaging material according to the above [2], since the protective layer is laminated on the heat-fusible resin layer, the moldability is further improved and a deeper embossed part can be formed. In addition, scratches and chemicals during molding can be prevented by the protective layer.

  The laminate packaging material according to [3] can easily remove the easily peelable portion and the release agent layer of the heat-fusible resin layer by setting the bonding force between the layers.

  The laminate packaging material according to the above [4] can easily remove the easy-release part and the release agent layer of the heat-fusible resin layer together with the protective layer by setting the bonding force between the layers.

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

  The laminate packaging material according to the above [6] has an embossed portion and is therefore useful as a material for a container having an increased internal volume.

  According to the method for manufacturing an electricity storage device described in [7] above, since the container is made of the packaging material from which the easily peelable portion of the heat-fusible resin layer is removed, the thickness and weight can be reduced. In particular, when a container is made of a packaging material having an embossed portion, since the molding is performed with the easily peelable portion of the heat-fusible resin layer attached, a deep embossed portion can be formed.

It is a top view of one embodiment of a laminate packaging material of the present invention. It is the 1B-1B sectional view taken on the line of FIG. 1A. It is sectional drawing of other embodiment of the laminate packaging material of this invention. It is sectional drawing of the laminate packaging material which has an embossing part. It is a perspective view of one embodiment of an electricity storage device of the present invention.

  2A and 2B show two embodiments of the laminate packaging material of the present invention. In the following description, members denoted by the same reference numerals represent the same or equivalent members, and duplicate descriptions are omitted.

[First laminate packaging material]
1A and 1B, an insulating adhesive layer 12 is laminated on the first surface of a metal foil 11, and a release agent layer 13 is laminated on the central portion of the insulating adhesive layer 12. The heat-fusible resin layer 14 is laminated on the entire area including the release agent layer 13. The first surface of the metal foil 11 is electrically insulated by the insulating adhesive layer 12. On the other hand, a heat resistant resin layer 16 serving as an outer layer of the container is laminated on the second surface of the metal foil 11 via an adhesive layer 15.

  In the heat-fusible resin layer 14, an easy peeling portion 21 surrounded by a cut line 20 is formed along the outline of the release agent layer 13, and a region around the easy peeling portion 21 is surrounded by the cutting line. The non-peeling portion 22 is not formed. The cut line 20 is a perforation in which cuts penetrating the heat-fusible resin layer 14 are continuous in a dot shape. The easy-to-peel portion 21 is intermittently connected as a part of the heat-fusible resin layer 14 by the cut line 20, but can be easily separated by the cut portion of the perforation.

  In the laminate packaging material 1, since the adhesive force between the insulating adhesive layer 12 and the heat-fusible resin layer 14 is partially weakened by the release agent layer 13, the heat-fusible resin layer 14 The non-peeling portion 22 directly laminated on the insulating adhesive layer 13 has a relatively strong adhesive force, and the easily peelable portion 21 laminated via the release agent layer 13 has a relatively strong adhesive force. weak. For this reason, when the easy peeling part 21 of the heat-fusible resin layer 14 is pulled, the easy peeling part 21 peels from the insulating adhesive layer 12 and the cut line 20 is cut. The easy peeling part 21 can be peeled by a simple method such as attaching one end of the adhesive tape to the easy peeling part 21 and pulling the other end. On the other hand, the non-peeling portion 22 is strongly bonded to the insulating adhesive layer 12 and the cut line 20 that is a boundary line with the easy-peeling portion 21 is cut, so that the insulating adhesive layer 12 does not peel off. Stay on top. With the removal of the peeled easily peeled portion 21, the release agent layer 13 adheres to the easily peeled portion 21 and is completely removed, or all or part of the release agent layer 13 remains on the insulating adhesive layer 12. By removing the easily peelable portion 21, the laminate packaging material 1 is exposed to the insulating adhesive layer 12 or the release agent layer 13, and is heat-sealed around the exposed insulating adhesive layer 12 or the release agent layer 13. The non-peeling portion 22 of the conductive resin layer 14 remains. FIG. 1B illustrates a state in which the release agent layer 13 is removed together with the easily peelable portion 21 and the insulating adhesive layer 12 is exposed.

  The release agent layer 13 is a layer provided to peel the easily peelable portion 21 from the insulating adhesive layer 12, and the portion exposed by removing the easily peelable portion 21 forms the inner surface of the container. For this reason, it is necessary to remove the release agent layer 13 if it is made of a material that does not interfere with contact with the stored item. There is no inconvenience even if it remains on the agent layer 12. Then, in the laminate packaging material 1 from which the easy peeling part 21 is removed, the non-peeling part 22 left around the exposed insulating adhesive layer 12 or release agent layer 13 forms a heat seal part of the container. Since the non-peeling portion 22 is integral with the packaging material, an operation such as assembling a heat sealing resin is unnecessary, and the container can be easily assembled.

  The heat-fusible resin layer 14 is a layer that is disposed so as to be opposed to each other in the packaging container and is used for sealing by heat sealing. On the other hand, the inner surface of the container needs to have electrical insulation, and the metal foil 11 needs to be covered with an insulator. A predetermined thickness is required to form a heat-sealing portion with high airtightness, and the thickness is thicker than that required to obtain electrical insulation. Further, in order to form a deeper embossed part, it is preferable that the metal foil 11 is coated with a resin layer having ductility to improve the moldability, but the thickness of the resin layer required for improving the moldability is also electrically insulating. Thicker than required to obtain. Since the first surface of the metal foil 11 that is the inner side of the container is electrically insulated by the laminated insulating adhesive layer 12 in the laminate packaging material 1, the heat-fusible resin layer 14 has an embossed portion. Although it is necessary for the entire first surface side during molding, it may be present at the peripheral edge during heat sealing. The laminate wrapping material 1 can form a deep embossed part by forming the embossed part in a state including the easily peelable part 21, and can remove the easy peeled part 21 when the packaging container is used. Accordingly, the thickness and weight of the product can be reduced, and as a result, the product using the container can be made thinner and lighter.

  Further, since the insulating adhesive layer 12 is covered with the heat-fusible resin layer 14 at the time of forming the embossed portion, it is possible to prevent the insulating adhesive layer 12 from being cracked. Since a part of the insulating adhesive layer 12 is exposed on the inner surface of the container, if the insulating adhesive layer 12 is cracked, the electrolytic solution will permeate and cause a decrease in insulation and corrosion of the metal foil 11.

  In the heat-fusible resin layer 14, the cut line 20 that is a boundary between the easily peelable portion 21 and the non-peelable portion 22 is preferably formed along the contour of the release agent layer 13. The cut line 20 does not need to exactly match the outline of the release agent layer 13, but if the cut line 20 protrudes greatly from the outline and is formed on the insulating adhesive layer 12, a part of the easy peeling portion 21 is formed. It becomes difficult to remove the easily peelable portion 21 due to strong adhesion to the insulating adhesive layer 12. On the other hand, when the cut line 20 is formed inside the outline of the release agent layer 13, a part of the release agent layer 13 remains between the insulating adhesive layer 12 and the non-peeling portion 22, There is no inconvenience even if the release agent layer 13 remains as long as there is no problem even if the release agent contacts the stored item.

  In the laminate packaging material 1, the bonding force between the respective layers on the first surface side of the metal foil 11 is not uniform and has a relative strength, and the adhesive force of the portion to be finally removed is set to be weak. Is preferred. As described above, the release agent layer 13 is a layer that does not need to be left, and can be used as it is regardless of the properties of the stored item if it can be removed together with the easily peelable portion 21. Therefore, the adhesive force f1 between the insulating adhesive layer 12 and the heat-fusible resin layer 14, the adhesive force f2 between the insulating adhesive layer 12 and the release agent layer 13, and the release agent layer 13 It is preferable that the adhesive force f3 between the heat-sealable resin layer 14 satisfies the relationship of f1> f2 and f3> f2. When the adhesive strengths f1, f2, and f3 between the layers satisfy the above relationship, the release agent layer 13 is removed together with the easily peelable portion 21 by pulling the easily peelable portion 21 of the heat-fusible resin layer 14. Thus, a part of the insulating adhesive layer 12 can be exposed.

[Second laminate packaging material]
The laminate packaging material 2 in FIG. 2 is obtained by laminating a peelable protective layer 17 on the heat-fusible resin layer 14 of the first laminate packaging material 1. The protective layer 17 adheres to the heat-fusible resin layer 14 unless an external force in the peeling direction is applied to the protective layer 17, but peels off from the heat-fusible resin layer 14 when the protective layer 17 is pulled.

  The protective layer 17 has an effect of preventing scratches due to contact with the molding tool during molding of the embossed portion and preventing erosion due to chemical adhesion. Since the non-peeling portion 22 of the heat-fusible resin layer 14 is a portion used for heat sealing without being removed, it is preferable that there is no scratch or chemical adhesion. Furthermore, by laminating the protective layer 17, the smoothness can be improved, so that the moldability is improved.

  In the laminate packaging material 2, the protective layer 17 can be peeled off from the heat-fusible resin layer 14, and the heat-fusible resin layer 14 can be separated by a tear line 20. When the portion is pulled, the protective layer 17 is peeled from the heat-fusible resin layer 14 in the non-peeling portion 22, and the heat-fusible resin layer 14 is cut along the cut line 20 in the easy-peeling portion 21. The easily peelable portion 21 thus adhered adheres to the protective layer 17 and peels off together with the protective layer 17. By this peeling, the laminate packaging material 2 exposes the insulating adhesive layer 12 or the release agent layer 13, and the heat-fusible resin layer around the exposed insulating adhesive layer 12 or the release agent layer 13. 15 non-peeling portions 22 remain. FIG. 2 shows a state in which the release agent layer 13 is removed together with the easily peelable portion 21 and the insulating adhesive layer 12 is exposed.

  When the protective layer 17 is peeled off from the easy peeling portion 21 and the easy peeling portion 21 remains, the laminate packaging material 1 is laminated. Therefore, the easy peeling portion 21 may be removed after the protective layer 17 is removed.

  In the laminate packaging material 2, the bonding force between the respective layers on the first surface side of the metal foil 11 is not uniform and has relative strength, and the adhesive force of the layer and part to be finally removed is set weak. And it is preferable that the easy peeling part 21 and the mold release agent layer 13 can be removed with the protective layer 17. Therefore, the adhesive force f1 between the insulating adhesive layer 12 and the heat-fusible resin layer 14, the adhesive force f2 between the insulating adhesive layer 12 and the release agent layer 13, and the release agent layer 13 Between the heat-sealable resin layer 14 and the heat-sealable resin layer 14 and the protective layer 17 satisfy the relationship of f1> f4> f2 and f3> f4> f2. Preferably it is. When the adhesive strengths f1, f2, f3, and f4 between the respective layers satisfy the above relationship, the easy peeling portion 21 and the release agent layer 13 are removed together with the protective layer 16 by pulling the protective layer 17. A part of the insulating adhesive layer 12 can be exposed.

[Other laminated forms of laminated packaging materials]
The laminate packaging material of the present invention is not limited to the laminated form of FIGS. 1A to 2, and various modifications are possible.

  The lamination | stacking form in the 2nd surface side of the said metal foil 11 is not limited, The packaging material which the 2nd surface is exposed is also contained in the technical scope of this invention. However, by covering the second surface of the metal foil 11 with a resin layer, the metal foil 11 can be protected to improve the weather resistance and the moldability. In addition, a coating layer is not limited to said heat resistant resin layer 16 and the adhesive bond layer 15, It can replace with a thin overcoat layer. Although the effect of improving the formability of the thin overcoat layer is small, it contributes to the reduction in thickness and weight of the packaging material.

  The laminate packaging material of the present invention includes a layer and a portion to be finally removed, and the adhesive strength between layers can be adjusted by appropriately using a release agent or a pressure-sensitive adhesive. For example, the protective layer 17 and the heat-fusible resin layer 14 can be bonded together by using the adhesiveness (adhesiveness) of the protective layer 17 and the heat-fusible resin layer 14 itself, but the adhesive between them. An adhesive layer or a release agent layer can be formed to adjust the adhesive force f4.

[Constituent material of laminate packaging material]
Although the present invention does not limit the material of the laminate packaging material, preferred materials include the following materials.

(Metal foil)
The metal foil 11 plays a role of imparting a gas barrier property to the laminate packaging material to prevent invasion of gas and moisture generated by reaction of oxygen and electrolyte. Examples thereof include aluminum foil, copper foil, nickel foil, stainless steel foil, clad foil thereof, annealed foil or unannealed foil thereof. It is also preferable to use a metal foil plated with a conductive metal such as nickel, tin, copper, or chromium, for example, a plated aluminum foil. The thickness of the metal foil 11 is preferably 7 to 150 μm.

It is also preferable that a chemical conversion film is formed on the metal foil 11. The chemical conversion film is a film formed by performing a chemical conversion treatment on the surface of the metal foil, and by performing such chemical conversion treatment, corrosion of the metal foil surface by the electrolytic solution can be sufficiently prevented. For example, the chemical conversion treatment is performed on the metal foil by performing the following treatment. That is, on the surface of the metal foil that has been degreased,
1) phosphoric acid;
Chromic acid,
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride; 2) phosphoric acid;
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of chromic acid and a chromium (III) salt, 3) phosphoric acid,
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 a chromium (III) salt;
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of a metal salt of fluoride and a nonmetal salt of fluoride, and coating the surface of the metal foil with any one of the above aqueous solutions 1) to 3) After the process, chemical conversion treatment is performed by drying.

The conversion coating, chromium coating weight preferably is 0.1mg ^{/ m 2} ~50mg ^/ m 2 as a (per one surface), in particular ^2mg / ^{m 2 ~20mg} / m ² preferred.

(Insulating adhesive layer)
The adhesive constituting the insulating adhesive layer 12 is required to have insulation, solvent resistance, chemical resistance, and moisture resistance, and is an olefin adhesive, acrylic adhesive, epoxy adhesive. Etc. are preferably used. The thickness of the insulating adhesive layer 12 is preferably 0.5 μm to 10 μm, particularly preferably 2 μm to 6 μm, considering the function of conditions sufficiently and considering weight reduction. Moreover, if it has the conditions of these insulating adhesive layers, that is, if it is a layer having insulation, solvent resistance, chemical resistance, and moisture resistance, for example, polyolefin resin, acrylic resin, epoxy type It can also be replaced with a coat layer made of resin or the like, and in this case, the thickness is preferably 0.5 μm to 10 μm, and particularly preferably 2 μm to 6 μm.

(Release agent layer)
Examples of the release agent constituting the release agent layer 13 include a silicone release agent and a fluorine release agent. The thickness of the release agent layer 13 is preferably 0.1 μm to 1 μm, and particularly preferably 0.2 μm to 0.6 μm.

(Heat-fusion resin layer)
The heat-sealable resin constituting the heat-sealable resin layer 14 is at least one heat-sealable resin selected from the group consisting of polyethylene, polypropylene, olefin copolymers, acid-modified products thereof, and ionomers. It is preferable that it is comprised by the unstretched film which consists of. The heat-fusible resin layer 14 requires at least a thickness necessary for heat sealing, and may be further thickened to improve moldability. In particular, in the first laminate packaging material 1 that does not have the protective layer 17, the moldability can be improved by increasing the thickness of the heat-fusible resin layer 14. Even if the thickness exceeds the thickness necessary for heat sealing for the purpose of improving the moldability, the inner surface portion of the container is finally removed as the easy-peeling portion 21, so that it does not contradict the thinning of the container. From this viewpoint, the thickness of the heat-fusible resin layer 14 is preferably set to 10 μm to 150 μm, particularly preferably 15 μm to 40 μm.

(Protective layer)
As the protective layer 17, it is preferable to use a polyolefin film, a polyester film, a polyamide film or the like. The thickness of the protective layer 17 is preferably 10 μm to 150 μm. If it is less than 10 μm, the effect of improving the moldability at the time of forming the embossed part is small. In addition, if the thickness is 150 μm, sufficient moldability can be obtained, and therefore an excessive thickness is wasted. A particularly preferred thickness is 20 μm to 60 μm.

  Further, since the protective layer 17 is a layer in which a forming tool such as drawing is in direct contact when the embossed portion is formed, it is preferable that the forming tool has a slippery surface property so as not to prevent plastic deformation. From this viewpoint, the surface of the protective layer 16 preferably has a dynamic friction coefficient defined by JIS K7125 (1999) of 1.0 or less, and more preferably 0.6 or less.

  In the laminate packaging material of the present invention, the protective layer 17 is an arbitrary layer, but the heat-fusible resin layer 14 is limited to the thickness necessary for heat sealing by providing the protective layer 17 and improving the moldability. Can do.

(Heat resistant resin layer)
As the heat resistant resin constituting the heat resistant resin layer 16, 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 by 10 ° C. than the melting point of the heat-fusible resin constituting the heat-fusible resin layer 14. It is particularly preferable to use a heat resistant resin having a melting point higher than 20 ° C. For example, it is preferable to use a stretched polyamide film, a stretched polyester film, a stretched polyolefin film, or the like. 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. The heat-resistant resin layer 13 may be formed as a single layer or, for example, a multilayer composed of a stretched polyester film / stretched polyamide film (a multilayer composed of a stretched PET film / stretched nylon film). May be. The thickness of the heat resistant resin layer 16 is preferably 5 μm to 100 μm.

  The heat-resistant resin layer 16 can be bonded to the metal foil 11 using the adhesiveness of the resin itself. However, in the case where the heat-resistant resin layer 16 is bonded via the adhesive layer 15, a polyester urethane adhesive and a polyether are used as the adhesive. It is preferable to use at least one adhesive selected from the group consisting of urethane adhesives. The thickness of the adhesive layer 15 is preferably set to 0.5 μm to 5 μm.

  When the heat resistant resin layer 16 is replaced with an overcoat layer, the resin constituting the overcoat layer is preferably a resin having heat resistance, and one or more of a thermosetting resin, a photocurable resin, and a two-component curable resin. It is preferable that it contains. Since these resins can easily control the curing reaction rate depending on the use environment of the resin such as temperature and light intensity, the lead time can be shortened by adjusting the curing reaction rate according to the work contents. For example, during application of the resin, a thin layer can be efficiently formed in a large area by slowing the curing reaction rate and maintaining the state where application is possible for a long time. Moreover, after applying the resin, the overcoat can be completed in a short time by increasing the curing reaction rate. Examples of the thermosetting resin include acid-modified polyolefin resins, examples of the photocurable resin include acrylate resins and epoxy resins, and examples of the two-component curable resins include urethane resins and epoxy resins.

  The thickness of the overcoat layer is preferably 0.5 μm to 5 μm. If the thickness 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. A particularly preferred thickness is 1 μm to 3 μm.

[Production method of laminate packaging material]
The laminate packaging material can be produced by bonding each layer so as to have the illustrated laminated form. Below, an example of the manufacturing process of the 1st laminate packaging material 1 and the 2nd laminate packaging material 2 is shown. In addition, the laminate packaging material of this invention is not limited to performing bonding of each layer in the following order, The order of bonding can be set arbitrarily.
(1) An adhesive is applied to the second surface of the metal foil 11 to form the adhesive layer 15.
(2) The heat resistant resin layer 16 is laminated on the second surface of the metal foil 11 via the adhesive layer 15, and the metal foil 11 and the heat resistant resin layer 16 are bonded together.
(3) An insulating adhesive is applied to the first surface of the metal foil 11 to form the insulating adhesive layer 12.
(4) A release agent is applied to a required position of the heat-fusible resin layer 14 to form the release agent layer 13. The method for applying the release agent is not limited, and examples include gravure roll coating, screen coating, and inkjet coating.
(5) Match the surface on the insulating adhesive layer 12 side of the laminate of (3) above with the surface of the release agent layer 13 of the heat-fusible resin layer 14 of the laminate of (4) above. Paste together.
(6) In the heat-fusible resin layer 14 of the laminate of (5), a tear line 20 is formed along the outline of the release agent layer 13, and the heat-fusible resin layer 14 is surrounded by the tear line 20. It separates into the easy peeling part 21 and the non-peeling part 22 which is not surrounded by the cut line 20. The cut line 20 is formed by cutting into the heat-fusible resin layer 14 with a tool such as a Thomson blade or a pinnacle blade, a laser cutter, a hot knife, or the like. The cut line 20 is not limited to the perforation that penetrates the heat-fusible resin layer 14. As another cut line, a notch cut in the middle of the thickness of the resin layer can be exemplified. The notch may be a single line or a dotted line with a short notch being continuous. Moreover, even if the easy peeling part 21 is cut | disconnected completely, if it remains in the laminate packaging material, the cutting line will be contained in the cutting line in this invention.
(6) A protective layer 17 is laminated on the heat-fusible resin layer 14 using a heat roll. The first laminate packaging material 1 on which the protective layer 17 is not laminated does not perform this step.

  When forming an overcoat layer on the second surface of the metal foil 11, instead of the steps (1) and (2), a resin for the overcoat layer is applied and dried. Further, the release agent layer 13 and / or the cut line 20 is formed after the heat-fusible resin layer 14 and the protective layer 17 are bonded to each other, and the release agent layer 13, the heat-fusible resin layer 14 and The three-layer laminate of the protective layer 17 can be bonded to the laminate (3). Further, the release agent layer 13 can be formed on the insulating adhesive layer 12.

  The laminate wrapping materials 1 and 2 can be produced in a size corresponding to a container having one easy-release part 21, and can also be produced as a large wrapping material or a long packaging material having a plurality of easy-release parts 21. . When manufacturing a large packaging material and a long packaging material, if the step (4) of applying the release agent is performed by gravure roll coating, a plurality of release agent layers 13 can be efficiently formed at predetermined intervals. Time can be shortened. In addition, since large wrapping materials and long wrapping materials or wrapping materials can be wound and stored in a roll shape, storage management is easy. The large wrapping material and the long wrapping material are used after being cut into a shape in which each easy peeling portion 21 is surrounded by the non-peeling portion 22.

  The produced laminate packaging materials 1 and 2 form an embossed portion by drawing or the like if necessary. FIG. 3 shows the laminate packaging material 3 in which the second laminate packaging material 2 of a flat sheet is formed to form an embossed portion 30 and a flange 31 around it. The embossed portion 30 protrudes toward the heat resistant resin layer 16 and is shaped so that the heat resistant resin layer 16 is a convex surface and the protective layer 17 is a concave surface. The laminate packaging material 3 is useful as a container material whose internal volume is expanded by the embossed portion 30.

  Various kinds of information can also be printed on the protective layer 17 of the produced laminate packaging material 2. Although the protective layer 17 is a layer that is finally peeled off, these steps can be assisted by printing the cutting position, the molding position of the embossed portion, and the like. Moreover, management of the packaging material can be assisted by printing the packaging material information.

[Power storage device and manufacturing method thereof]
The laminate packaging material of the present invention is used as a material for containers for power storage devices, containers for foods, pharmaceuticals and the like. The power storage device 4 of FIG. 4 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 the laminate packaging material 3 having the embossed portion 30 and the flange 31 shown in FIG. 3, and a cover plate 42 made of the laminate packaging material 2 of a flat sheet having the same dimensions as the planar dimensions of the container body 41. A space surrounded by the embossed portion 30 and the cover plate 42 of the container main body 41 is defined as a storage chamber 43. The laminate wrapping materials 2 and 4 constituting the container body 41 and the cover plate 42 are formed on the inner surface of the storage chamber 43 by removing the protective layer 17, the easy-release part 21 of the heat-fusible resin layer 14, and the release agent layer 13. The insulating adhesive layer 12 is exposed. Further, the flange 31 of the container body 41 has the non-peeling portion 22 of the heat-fusible resin layer 14, and the portion of the lid plate 42 that overlaps the flange 31 of the container body 41 also has the non-peeling portion of the heat-fusible resin layer 14. The peeling part 22 exists.

  A power storage device main body 50 is stored in the storage chamber 43 of the container 40. A positive electrode tab lead 51 and a negative electrode tab lead 52 are connected to the positive electrode and the negative electrode of the electricity storage device main body 50, respectively. In the state where the container is pulled out, the overlapping portion between the flange 31 of the container body 41 and the peripheral edge of the lid plate 42 is heated, and a heat seal portion is formed in which the non-peeling portion 22 (the heat-fusible resin layer 14) is fused. Yes.

  The power storage device 4 is made thinner and lighter by removing the heat-fusible resin layer 14 from the inner surface of the storage chamber 43 of the container 40. Further, since the embossed portion 30 of the container body 41 is formed with the protective layer 17 and the heat-fusible resin layer 14 attached, the deep embossed portion 30 can be formed.

  In the power storage device of the present invention, the shape of the container, the shape of the power storage device body, the position of the tab lead, the method of energizing the stored power 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 corresponds to the electricity storage device of the present invention. Moreover, the electrical storage device using the pouch-type container which does not have an embossed part is also contained in this invention.

  As Example 1, a thin overcoat layer is formed in place of the heat-resistant resin layer 16 and the adhesive layer 15 on the second surface of the metal foil 11 of the laminate packaging material 1 in FIG. A laminate packaging material was prepared using the heat-fusible resin layer 14 shown in FIG. Further, as Examples 2 to 5, a thin overcoat layer is formed instead of the heat-resistant resin layer 16 and the adhesive layer 15 on the second surface of the metal foil 11 of the laminate packaging material 2 of FIG. On the surface, a laminate packaging material was produced using the heat-fusible resin layer 14 and the protective layer 17 shown in Table 1. The protective layer 17 is roughened so that the surface of the resin film having the material and thickness shown in Table 1 has the dynamic friction coefficient described. The following common materials were used except for the heat-fusible resin layer 14 and the protective layer 17.

Metal foil 11: Aluminum foil of A8079 classified by JIS H4160, thickness 40 μm
Insulating adhesive layer 12: Two-component curable olefin adhesive, 5 μm thick
Release agent layer 13: Silicone release agent, thickness 1 μm
Overcoat layer: Epoxy resin, thickness 3μm
The protective layer 17 used in each example is as shown in Table 1, and the dynamic friction coefficient measured based on JIS K7125 (1999) is shown in Table 1.

The laminate packaging material of Example 1 was produced by the following steps (1) to (5). Moreover, the laminate packaging material of Examples 2-5 was produced in the following processes (1) to (6).
(1) An overcoat layer was laminated on the second surface of the metal foil 11.
(2) An insulating adhesive layer 12 was formed at the center of the first surface of the metal foil 11.
(3) A release agent was applied to the center of the heat-fusible resin layer 14 with a gravure roll to form a release agent layer 13 of 55 mm × 35 mm.
(4) The surface of the laminate of (2) on the insulating adhesive layer 12 side and the surface of the heat-fusible resin layer 14 of the laminate of (3) are combined and bonded together. It was.
(5) In the heat-fusible resin layer 14, a cut line 20 was formed along the outline of the release agent 14, and was divided into an easily peelable portion 21 and a non-peelable portion 22.
(6) A protective layer 17 was laminated on the heat-fusible resin layer 14 using a heat roll.

  Each laminate packaging material was subjected to a molding test for forming an embossed portion (see FIG. 3) by deep drawing to evaluate the moldability.

  The deep drawing forming tool includes a punch for pressing a laminate packaging material to form an inner surface shape of an embossed portion, a die having a square hole for allowing the laminate packaging material pressed into the punch to flow, and a hole for the die. A blank holder having a square hole of a size and holding the laminate packaging material around the hole. The top surface dimension of the punch is 55 mm × 35 mm.

  In the deep drawing, the heat sealing resin layer 14 (Example 1) or the protective layer 17 (Examples 2 to 5) of the laminate wrapping material is applied to the top surface of the punch, and the convex surface of the embossed portion is the overcoat layer and concave surface. Is a mode in which the heat-fusible resin layer 14 (Examples 1 to 4) and the protective layer 17 (Examples 2 to 5) are formed, and the drawing depth (the height of the embossed portion) is changed. Then, the occurrence of pinholes and cracks at the corners of the embossed part of the molded product was examined, and the limit depth at which these did not occur was defined as the maximum molding depth of the laminate packaging material. Table 1 shows the forming depth.

  From the above test results, it was confirmed that Examples 1 to 5 were able to mold the embossed part, and that a high formability was obtained by further providing a protective layer and lowering the dynamic friction coefficient of the protective layer.

  Furthermore, one end of the pressure-sensitive adhesive tape is applied to the easily peelable portion 21 of the laminated packaging material after the molding in Example 1 and the other end is pulled, so that the insulating adhesive layer 12 and the release agent layer 13 are between. The easy peeling part 21 and the release agent layer 13 were removed by peeling. For Examples 2 to 5 laminate packaging material, the end portion of the protective layer 17 is pulled and peeled between the non-peeling portion 22 and the protective layer 17 and between the insulating adhesive layer 12 and the release agent layer 13. The protective layer 17, the easy peeling part 21 and the release agent layer 13 were removed.

  The laminate packaging material of the present invention can be used as a container material that is required to be thin and light.

1, 2, 3 ... Laminate packaging material 4 ... Power storage device 11 ... Metal foil 12 ... Insulating adhesive layer 13 ... Release agent layer 14 ... Heat-fusible resin layer 17 ... Protective layer 20 ... Cut line 21 ... Easy peeling Part 22 ... Non-peeling part 30 ... Embossed part 40 ... Container 43 ... Storage chamber 50 ... Power storage device body

Claims (7)

Metal foil,
An insulating adhesive layer laminated on the first surface of the metal foil;
A release agent layer laminated on a partial region of the insulating adhesive layer;
A heat-fusible resin layer laminated on an insulating adhesive layer including the release agent layer,
The heat-fusible resin layer includes at least one easily peelable portion surrounded by a cut line formed by cutting the heat-fusible resin layer, and is disposed around the easy peelable portion to form a cut line. A laminate packaging material, which is divided into non-exposed non-exfoliating parts, and the easy exfoliating part is provided along the outline of the release agent layer.   The laminate packaging material according to claim 1, further comprising a protective layer made of a resin film laminated on the heat-fusible resin layer and peelable from the heat-fusible resin layer.   Adhesive force f1 between the insulating adhesive layer and the heat-fusible resin layer, adhesive force f2 between the insulating adhesive layer and the release agent layer, the release agent layer and the heat-fusible resin layer The laminate packaging material according to claim 1, wherein an adhesive force f3 between the two satisfies a relationship of f1> f2 and f3> f2.   Adhesive force f1 between the insulating adhesive layer and the heat-fusible resin layer, adhesive force f2 between the insulating adhesive layer and the release agent layer, the release agent layer and the heat-fusible resin layer The laminate packaging material according to claim 2, wherein an adhesive force f3 between the heat-sealable resin layer and a protective material f4 between the protective layer satisfies the relationship of f1> f4> f2 and f3> f4> f2. .   The laminate packaging material according to any one of claims 1 to 4, which has a plurality of easy peeling portions.   The laminate packaging material according to any one of claims 1 to 5, further comprising an embossed portion recessed on the heat-fusible resin layer side, wherein an easily peelable portion is present in the embossed portion. The easily peelable portion of the heat-fusible resin layer of the laminate packaging material according to any one of claims 1 to 6 is removed to expose and expose the insulating adhesive layer or the release agent layer. A container in which the insulating adhesive layer or the release agent layer faces the storage chamber and the non-peeling portion protrudes outside the storage chamber;
Inserting an electricity storage device into the storage chamber of the container,
A method of manufacturing an electricity storage device, wherein the non-exfoliation part of the container is heat-sealed to seal the electricity storage device in a storage chamber.

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