JP2018177377A - Roll shape laminating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce generation of patterns on a roll of laminating material having sections having a different thickness.SOLUTION: A laminating material 1 in which a metallic foil 11 and resin layers 13, 15 are adhered has repeat of different thickness parts 21 having a different thickness from a periphery in a MD direction (Machine Direction) at a main region 23 excepting for ear parts 22 at both ends in a TD direction (Transverse Direction). The laminating material 1 is wound on a winding core 2 together with two ribbons 30 overlapping with each of the ear parts 22 into multiple layers. The ribbons 30 are sandwiched between the wound laminating material 1.SELECTED DRAWING: Figure 3

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a roll-like product obtained by winding a laminate material used for an exterior body of an electricity storage device or a packaging material for food or medicine on a winding core.

  Batteries such as storage batteries for mobile communication terminals, storage batteries for vehicles, storage batteries for regenerative energy recovery, capacitors, all-solid-state batteries, etc. Metal foils are used in place of conventionally used metal outer casings as their size and weight are reduced. In many cases, an outer package made of a laminate material is used, in which resin films are bonded to each other with an adhesive agent (see Patent Document 1).

  In the capacitor laminate case described in Patent Document 1, the resin film layer inside the case is notched to expose the metal foil to form an electrode connection portion, and the resin film layer outside the case is notched to expose the metal foil To form an electrode terminal. Since this type of laminate case does not require tab leads, the capacitor can be made smaller and lighter.

  In addition, as a method of exposing metal foil in a laminate material, the applicant forms a portion not to apply an adhesive to the portion to be exposed in the step of bonding metal foil and resin film, and after bonding, resin on unapplied portion A method for cutting a film has been proposed (see Patent Document 2). According to this method, since the metal foil and the resin film are not adhered to the portion to be exposed, the resin film can be easily cut off, and the metal foil surface is not contaminated with the adhesive.

  Further, in the step of bonding the metal foil and the resin film, the resin material is bonded after the mold release material is pasted or applied to the exposed part of the metal foil, and then the resin material is removed when the resin film is cut off. There is also a method to remove along with

JP, 2013-161674, A JP, 2015-205504, A JP, 2014-15337, A

  The above-mentioned laminate material is laminated into layers to form a laminate, which is wound on a winding core following the laminating step, and the raw fabric is stored in a rolled state. In addition, the resin film of the resin film is partially cut away while being unrolled, and is wound around another winding core.

  The raw material of the laminate material for forming the metal foil exposed part, in the part with adhesive uncoated part, the part is thinner than the surrounding, and the part to which the releasing material is applied, the part is thicker than the surrounding It is getting thicker. For this reason, when a long laminate material is wound around a winding core in a plurality of layers to form a roll, there may occur a case where the shape of portions having different thicknesses is transferred to the laminated laminate material. In addition, the laminated material after partially cutting the resin layer to form the metal foil exposed portion is also thinner than the surrounding portion where the metal foil exposed portion is formed. It may occur. Such die attachment degrades the appearance quality of the laminate material.

  In Patent Document 3, as a method of reducing a step mark caused by a step formed at a winding start end in a roll of adhesive tape, a step mark reducing structure in which resin is filled in the step and a slope is formed is disclosed. Have been described. However, the step mark reduction structure of Patent Document 3 is directed to a tape having a constant thickness, and can not reduce the molding of a laminate material having portions with different thicknesses.

  An object of the present invention is, in view of the technical background described above, to reduce molding in a roll of laminate material having portions with different thicknesses.

  That is, this invention has a structure as described in following [1]-[4].

[1] Laminated material in which metal foil and resin layer are bonded together has different thickness portions with different thickness from the periphery repeatedly in the MD direction (Machine Direction) in the main area except the ear parts at both ends in the TD direction (Transverse Direction) And
A roll-shaped laminate material, wherein the laminate material is wound in multiple layers around a winding core together with two ribbons stacked on each ear portion, and the ribbon is sandwiched between the wound laminate materials.

  [2] The roll according to item 1 above, wherein the different thickness portion is formed by a metal foil exposed portion where a part of the resin layer is removed to expose the metal foil, or a planned formation portion of the metal foil exposed portion Laminated material.

  [3] The roll laminate material according to the above 1 or 2, wherein the tensile elongation in the MD direction of the ribbon is less than 100%.

  [4] The roll-shaped laminate material according to any one of the aforementioned Items 1 to 3, wherein the thickness of the ribbon is 10 μm to 200 μm.

  In the roll-like laminate material described in the above [1], the ear portion in which the ribbon is sandwiched is tightened as the height of the ears, and the main region in which the ribbon is not sandwiched is loosely wound. Since the main region having the different thickness portion is loosely wound, the overlapping laminate materials do not make strong contact, and the molding due to the different thickness portion is reduced.

  According to the roll-like laminate material described in the above [2], a laminate having a metal foil exposed portion or a planned formation portion of the metal foil exposed portion where a part of the resin layer is removed as the different thickness portion to expose the metal foil. The above effects can be obtained in wood.

  According to the roll-shaped laminate material described in the above [3], it is difficult for the laminate material and the ribbon to be dislocated from each other, and the roll material having a stable shape can be formed.

  According to the rolled laminate material described in the above [4], the strength of the winding in the main area can be loosened properly.

It is a perspective view of a laminate material applied to a roll laminate material of the present invention. It is the 1B-1B line sectional view in Drawing 1A. It is a figure which shows typically the winding-up process of the laminate material of FIG. 1A. It is sectional drawing of the roll-shaped laminate material of this invention. It is sectional drawing of another laminate material. It is sectional drawing of another laminated material. It is a top view which shows the example of another arrangement | positioning of a laminate material and a ribbon.

  FIGS. 1A and 1B are laminates to which the present invention is applied, and FIGS. 2 and 3 show a roll laminate and a method of forming the same. 4 and 5 show other laminates, and FIG. 6 shows other arrangements of laminates and ribbons. These laminate materials are used as an exterior body of an electricity storage device.

In the following description, members given the same reference numerals represent the same or equivalent members, and redundant description will be omitted.
[Laminate material]
The heat-resistant resin layer 13 to be the outer layer of the case is laminated on one side of the metal foil 11 via the first adhesive layer 12 and the metal foil layer 11 of FIG. 1A and FIG. The thermally adhesive resin layer 15 which is to be the inner layer of the case is laminated via the second adhesive layer 14 on the other surface of the metal foil 11, and the resin layers are laminated on both sides of the metal foil 11. The second adhesive layer 14 is formed with an adhesive non-applied portion 14 a where the adhesive is not applied.

  In the adhesive uncoated portion 14a, the metal foil 11 and the heat fusible resin layer 15 are separated without being adhered to each other, and the heat fusible resin layer 15 can be easily peeled off. That is, the easily peelable portion 20 is formed on a part of the heat fusible resin layer 15. One such easily peelable portion 20 is formed in the TD direction (Transverse Direction) of the laminate 1 and is repeatedly formed at a predetermined interval in the MD direction (Machine Direction).

  Since the lower portion of the easily peelable portion 20 is hollow, the easily peelable portion 20 which is a part of the heat-fusible resin layer 15 is recessed and thinner than the surrounding portion to which the adhesive is applied. Therefore, the portion where the easily peelable portion 20 is formed corresponds to the different thickness portion 21 in the present invention. Further, in the TD direction of the laminate material 1, the both ends are the ears 22, and the area excluding the ears 22 is the main area 23. Although there is no clear boundary between the ear portion and the main area, there is no uneven thickness portion 21 due to the adhesive non-applied portion 14a in the ear portion.

  The method for producing the laminate material 1 having the adhesive uncoated portion 14a is not limited, and can be produced, for example, by the following method.

The adhesive is applied to the metal foil 11 while forming the adhesive non-applied portion 14a to which the adhesive is not applied using a gravure roll having irregularities on the surface, and then the metal foil 11 and the heat fusible resin layer 15 are attached Aging treatment together. The application method of the adhesive is not limited to roll coating, and there is a method of spray-coating the adhesive while forming an uncoated portion by an inkjet method. The heat-resistant resin layer 13 having no easily peelable portion is coated with an adhesive on the entire mating surface of the metal foil 11 and the heat-resistant resin layer 13 to form a first adhesive layer 12, and these are bonded.
[Roll-like laminate material]
As shown in FIG. 2 and FIG. 3, when laminating the layers 1 is completed, the ribbon 30 is disposed so as to overlap the ear portions 22 at both ends in the TD direction when winding up on the winding core 2. The roll 30 is wound while being sandwiched, and is wound with a plurality of layers together with the ribbon 30 to form the roll-shaped laminate material 3.

  The thickness of both ends of the roll-shaped laminate material 3 is increased by the ribbon 30 being sandwiched by the ear portions 22 of the laminate material 1, and the height of the rolled laminate material 3 is increased. The ear portion 22 in which the ribbon 30 is sandwiched is tightly wound, but the main region 23 in which the ribbon 30 is not sandwiched is loose in winding tightness. Since the main region 23 in which the different thickness portion 21 is formed is loosely wound, the overlapping laminate materials 1 are not in strong contact with each other, and it is difficult to cause molding by the different thickness portion 21 and molding is reduced. Ru.

The roll-shaped laminate material 3 in the illustrated example is sandwiched so that the ribbon 30 slightly protrudes from the ear portion 22 of the laminate material 1. As shown in this figure, the laminate material 1 and the ribbon 30 do not have to be exactly at the ends, and there is no problem even if one of the laminate material 1 and the ribbon 30 protrude outside.
[Other laminate materials]
The different thickness portion in the laminate material of the present invention means a portion surrounded by a portion having a different thickness, and a thin portion surrounded by a thick portion or a thick portion surrounded by a thin portion It is. The laminate material has such different thickness portions repeatedly in the MD direction (winding direction).

  The laminate material 1 of FIG. 1A has a different thickness portion 21 thinner than the periphery. When the laminate 1 is used as an outer package of a storage device, as shown in FIG. 4, the easily peelable portion 20 is cut away to form a metal foil exposed portion 24. The portion where the metal foil exposed portion 24 is formed is a different thickness portion 25 thinner than the surrounding. The removal of the easily peelable portion 21 may be continuously performed during the process of unwinding the roll-shaped laminate 3 and winding it on another winding core. Since it is a laminate material having different thickness portions 25 repeatedly in the MD direction even after the metal foil exposed portion 24 is formed, it is wound from the roll-shaped laminate material 3 along with the ribbon 30 around another winding core or while sandwiching the ribbon anew By winding up, it is possible to reduce the occurrence of molding in the roll laminate material.

  The laminate 4 in FIG. 5 has a different thickness portion 26 thicker than the periphery. The laminating material 4 applies a mold release agent 16 to a required position of the metal foil 11 and applies an adhesive to the entire surface of the metal foil 11 including the mold release agent 16 to form a second adhesive layer 14. The heat fusible resin layer 15 is bonded. The metal foil 11 and the heat-resistant resin layer 13 are bonded by applying an adhesive to the entire mating surface to form a first adhesive layer 12. By interposing the mold release agent 16 between the metal foil 11 and the second adhesive layer 14, the bonding strength between the heat fusible resin layer 15 and the metal foil 11 is weakened, and the heat fusible resin layer 15 thermally melts. An easily peelable portion 27 in which the partial removal of the adhesive resin layer 15 is easy is formed. Since the thickness of the mold release agent 16 is added to the portion where the easily peelable portion 27 is formed, the thickness is thicker than the surroundings. Therefore, the portion where the easily peelable portion 27 is formed corresponds to the different thickness portion 26 in the present invention.

  The laminate material 4 is wound around the winding core while sandwiching the ribbon in the ear portion as in the case of the laminate material 1 having the thin different thickness portion 21 and the strength of the winding of the main region where the different thickness portion 26 is formed. By loosening the size, the occurrence of mold can be reduced.

  When the laminate material 4 is cut and pulled along the periphery of the easy-to-peel portion 27 of the heat-fusible resin layer 15, the second adhesive layer 14 and the release material 16 are pulled together with the easy-to-peel portion 27 and metal foil 11 is exposed. The metal foil exposed portion 24 is formed by removing the easily peelable portion 27, and the same as the laminate material (see FIG. 4) in which the easily peelable portion 21 of the laminate material 1 of FIG. 1A is removed to form the metal foil exposed portion 24. It becomes a form and becomes a laminate material which has the different thickness part 25 thinner than circumference | surroundings. This laminate material can also reduce the occurrence of molding in the roll-like laminate material by winding it around the winding core while sandwiching the ribbon.

  In addition, even when the application of the release agent 16 is changed to the attachment of a sheet-like release agent, the easily peelable portion can be formed. Since the easy-to-peel part by the adhesion of such a mold release material is also thicker than the surroundings and corresponds to the different-thickness part of the present invention, the occurrence of molding can be reduced by sandwiching the ribbon.

  The easily peelable portions 21 and 27 of the laminate materials 1 and 4 described above are portions processed so as to easily peel off a part of the resin layer on the premise that the metal foil exposed portion 24 is formed, and in the present invention It corresponds to the formation planned portion of the metal foil exposed portion.

The laminate material to which the present invention is applied is not limited to the one having the metal foil exposed portion or the planned formation portion of the metal foil exposed portion. Whatever the cause of the formation of the different thickness portion, the mold can be reduced by sandwiching the ribbon in the ear portion. Moreover, although the laminate material which has a resin layer on both surfaces of metal foil is used for a battery case, the use of the laminate material which applies this invention is not limited, The laminate material which has a resin layer only on one side of metal foil is also this It is included in the technical scope of the invention. In the laminate material having a resin layer on both sides of the metal foil, the different thickness portion may be formed on one side or both sides, and the shape and number of different thickness portions are not limited at all.
[Laminated material and ribbon material]
This invention does not limit the material of each layer which comprises a lamination material, and is suitably selected according to the use of a lamination material. The following are examples of preferred materials for the battery case.

  Examples of the metal foil 11 include aluminum foil, stainless steel foil, nickel foil, copper foil, titanium foil, and clad foils of these metals, and further, plated foils obtained by plating these metal foils. Moreover, it is also preferable to form a chemical conversion film on these metal foils. The thickness of the metal foil 11 is preferably 7 μm to 150 μm.

  As a heat resistant resin which comprises the heat resistant resin layer 13, the heat resistant resin which is not fuse | melted at the heat seal temperature at the time of heat-sealing laminated material is used. As the heat-resistant resin, it is preferable to use a thermoplastic resin having a melting point higher by 10 ° C. or more than the melting point of the thermoplastic resin constituting the heat-fusible resin layer 15, and a melting point higher by 20 ° C. or more than the melting point of the thermoplastic resin It is particularly preferred to use a thermoplastic resin having For example, a polyamide film, a polyester film, etc. are mentioned, These stretched films are used preferably. Among them, in view of moldability and strength, a biaxially stretched polyamide film or a biaxially stretched polyester film, or a multilayer film containing these is particularly preferable, and further, a biaxially stretched polyamide film and a biaxially stretched polyester film are laminated. It is preferred to use a multilayer film. The polyamide film is not particularly limited, and examples thereof include 6-polyamide film, 6,6-polyamide film, and MXD polyamide film. Moreover, a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, etc. are mentioned as a biaxially stretched polyester film. Further, the heat resistant resin layer 13 may be formed as a single layer, or may be formed as a multilayer formed of, for example, a PET film / polyamide film. The thickness is preferably in the range of 9 μm to 50 μm.

  The thermoplastic resin constituting the heat-fusible resin layer 15 is composed of polyethylene, polypropylene, an olefin copolymer, an acid-modified product thereof and an ionomer in terms of chemical resistance and heat sealing property. Is preferred. Further, as the olefin copolymer, EVA (ethylene-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer), and EMAA (ethylene-methacrylic acid copolymer) can be exemplified. Moreover, a polyamide film (for example, 12 nylons) and a polyimide film can also be used. The thickness is preferably in the range of 20 μm to 80 μm.

  As the first adhesive 12 on the heat-resistant resin layer 13 side, for example, a two-component curable polyester-urethane resin or polyether-urethane resin made of a polyester resin as a main agent and a polyfunctional isocyanate compound as a curing agent It is preferable to use an adhesive containing On the other hand, as the second adhesive 14 on the heat fusible resin layer 15 side, for example, a polyurethane-based adhesive, an acrylic-based adhesive, an epoxy-based adhesive, a polyolefin-based adhesive, an elastomer-based adhesive, a fluorine-based adhesive And the like.

  The ribbon 30 is preferably made of a material having a tensile elongation of less than 100% in the MD direction defined by JIS K7162-2 (2014) for resin or laminate film, and JIS P8113 for paper. . Since the ribbon 30 having a tensile elongation of less than 100% can suppress the thickness change at the time of winding, it is difficult to be displaced with respect to the laminate material 1, and the winding shift and the winding looseness hardly occur, and the shape of the roll-shaped laminate material 3 can be stabilized. it can. Particularly preferred tensile elongation is 80% or less. Examples of materials that satisfy the tensile elongation conditions include resin films, laminate materials in which resin films are laminated on both sides of metal foil, and paper. As the resin film, a film of rigid polyvinyl chloride, polystyrene, ABS resin, high density polyethylene, polyacetal, acrylic resin), cellulose acetate, polycarbonate, polyamide, polyethylene terephthalate is preferable. The laminating material is preferably one in which the above resin film is laminated on both sides of a metal foil such as aluminum. Also, the paper is preferably dust free.

  Moreover, as for the thickness of the said ribbon 30, 10 micrometers-200 micrometers are preferable. If it is less than 10 μm, the effect of reducing the winding strength of the main area by reducing the ear height is small. Also, the larger the thickness is, the looser the winding strength of the main area, but if the thickness is 200 μm, since the molding is sufficiently reduced, the thickness can not be further increased. The particularly preferred thickness is 20 μm to 120 μm. The width of the ribbon 30 is preferably 10 mm to 30 mm.

Further, the material of the winding core 2 is not limited at all, and a known winding core such as paper or metal tube can be used.
[Arrangement of other ribbons]
In the roll-like laminate material of the present invention, the ribbon is sandwiched at least at both ends in the TD direction, and if necessary, one or more ribbons may be sandwiched in the main region. In particular, when the raw fabric is slitted and divided into a plurality of rolls, in the process of winding the raw fabric around a winding core, the ribbon is sandwiched at a slitting planned position and a position not overlapping the different thickness portion and slitted together with the ribbon Is preferred.

  In the laminate material 5 of FIG. 6, three different thickness portions 28a, 28b and 28c are formed in the TD direction, with one large and small thickness portion being a pair, and three different thickness portions 28a in the MD direction, 28b and 28c are repeatedly formed. The laminate material 5 is formed into a roll (not shown) by holding the ribbon 30 at a total of four places between the different thickness portions 28a and 28b and the different thickness portions 28b and 28c. Then, when the laminate 5 is slit with the ribbon 30 at the position indicated by the alternate long and short dash line S and divided into three strips and wound around the winding core, the ribbon 30 is sandwiched between the two ear parts of each slit processed product, resulting in three slits. Also in the processed product, it is possible to reduce the molding due to the different thickness portions 28a, 28b and 28c.

  Even when the slit processing is not performed, the ribbon may be inserted in the main area. In the case of a wide laminate material, the effect of loosening the strength of the tightening is reduced near the center, and therefore, by sandwiching the ribbon in the main region, it is possible to reduce the molding due to the different thickness portion. When sandwiching the ribbon in the main area, it is preferable to dispose the ribbon in a place where the different thickness portion does not exist in the MD direction.

  The present invention can be suitably used for a laminate material having a metal foil exposed portion or a planned formation portion of a metal foil exposed portion.

1, 4, 5 ... Laminating material 2 ... Winding core 3 ... Roll-like laminating material 11 ... Metal foil 13 ... Heat resistant resin layer 15 ... Heat fusible resin layer 20, 27 ... Easy peeling portion 21, 25, 26, 28a , 28b, 28c ... different thickness portion 22 ... ear portion 23 ... main region 24 ... metal foil exposed portion 30 ... ribbon

Claims (4)

The laminate material in which the metal foil and the resin layer are bonded to each other has, repeatedly in the MD direction (Machine Direction), different thickness portions different in thickness from the periphery in the main region excluding the ear portions at both ends in the TD direction (Transverse Direction)
A roll-shaped laminate material, wherein the laminate material is wound in multiple layers around a winding core together with two ribbons stacked on each ear portion, and the ribbon is sandwiched between the wound laminate materials.   The roll-shaped laminate material according to claim 1, wherein the different thickness portion is formed by a metal foil exposed portion where a part of the resin layer is removed to expose the metal foil, or a formation planned portion of the metal foil exposed portion. .   The roll-like laminate material according to claim 1 or 2, wherein the ribbon has a tensile elongation of less than 100% in the MD direction. The roll-shaped laminate material according to any one of claims 1 to 3, wherein the thickness of the ribbon is 10 μm to 200 μm.

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