JP2016107562A - Sheet having good exposure conductor on both surfaces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-like material which can cope with not only applications requiring conductivity in electronic and electric fields but also various applications such as applications requiring thermal conductivity, liquid-blocking properties and gas barrier properties; also can respond to reduction in sheet thickness, increase in mechanical strength, achievement of translucency and transparency, and the like; and can be suitably used as not only an electrode conducting between both surfaces of the sheet but also a thermal conductive sheet for heat dissipation and heat absorption, and the like.SOLUTION: A sheet is formed into a sheet-like body while using a resin as a shape keeping material, and has good exposure conductors 5 dispersedly arranged on both surfaces of the sheet by allowing a good conductive wire 2 which is embedded along a sheet plane direction and is made from a good conductor to meander along a sheet thickness direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sheet provided with an exposed good conductor on both sides, which can be used not only as an electrode in which both sides of the sheet are conducted, but also as a heat conducting sheet for heat dissipation and heat absorption.
In the present specification, “exposed good conductor” refers to a portion formed of a material (good conductor) having good electrical or thermal conductivity. This exposed good conductor is obtained by exposing a part of a wire or a fiber material (hereinafter referred to as “good conductive wire”) formed by the good conductor on both the front and back surfaces of the sheet.

  Specific examples of good conducting wires include metal fibers (wires), metal fibers (wires), metal or resin fibers, wires, or animal and vegetable fibers as core materials (thin films and plated films). Etc.), and “carbon fiber” formed of carbon having good thermal or electrical conductivity. In short, a good conductive wire is a wire that can effectively utilize the conductivity and thermal conductivity of metal, carbon, and the like.

A conductive base fabric made by attaching a conductive member to a non-conductive flexible material such as a woven fabric or a knitted fabric, or by inserting conductive fibers into it. A laminated sheet that is entirely covered with a resin layer has been proposed (see Patent Document 1). This laminated sheet can be used, for example, to prevent static electricity.
On the other hand, a battery electrode base material has been proposed in which one or both sides of a base fabric having almost no loop woven or knitted from metal fibers are covered with a loop layer knitted from metal fibers ( Patent Document 2). This base material can be used as an electrode for a secondary battery such as a nickel cadmium battery or a nickel metal hydride battery.

Japanese Patent Laid-Open No. 7-100998 Japanese Patent Laid-Open No. 11-185766

In the conventional laminated sheet (Patent Document 1), the conductivity of the resin layer covering the front and back surfaces is lower than the conductivity of the base fabric (the electric resistance is large), so that the electrodes that conduct between the front and back surfaces of the laminated sheet are used. It is not suitable for use as. In addition, in this laminated sheet, in order to take the ground from the base fabric, a base fabric exposed portion where the base fabric is exposed is partly formed on a part of the resin layer.
In other words, in other words, the electrical resistance is too high from the surface of the resin layer unless the base fabric exposed portion is provided, and electrical conduction from the base fabric cannot be ensured. In addition, in such a laminated sheet, not only the problem that internal resistance increases and causes noise during energization due to the laminated structure, but also a problem that delamination and cracks are likely to occur. Has been.

On the other hand, the conventional base material (Patent Document 2) is present in a state where large loops are irregularly planted or fallen on the surface (one side or both sides of the base material) covered with the loop layer. For this reason, it is difficult to provide transparency with this substrate, and it is not suitable for applications that require transparency. In addition, when a plurality of base materials are used in a laminated manner, the entanglement region or the cut region between the loops is randomly generated between the layers, resulting in a variation in electric field characteristics, particularly when a separator is sandwiched. There is also a risk that the separator may break down to a short circuit problem.

  Furthermore, since the base fabric and the loop layer are porous in this base material, there are infinite voids (pinholes) penetrating in the thickness direction. Therefore, liquid shielding between the front and back surfaces of the base material (acts to block not only water but also liquids such as organic solvents in the sheet surface direction without blocking in the sheet thickness direction) and gas barrier properties (not only air but various gases, etc.) It was difficult to provide an action that blocks all gases. Therefore, when used in applications requiring these liquid shielding properties and gas barrier properties, it must be thick, and as a result, this thickness becomes a bottleneck and is unsuitable for use.

Metal foil is well known as a material having conductivity, thermal conductivity, liquid shielding properties, gas barrier properties, and the like. Metal foil also has the advantage of being lightweight and flexible. However, the metal foil has a serious drawback in that it has low fracture strength, and therefore it has been difficult to obtain a necessary and sufficient effect except for conductivity.
Thus, in the past, not only applications that require electrical conductivity in the electronic and electrical fields, but also a wide range of applications such as applications that require thermal conductivity, liquid shielding, and gas barrier properties. The sheet-like material has not been proposed as a material that satisfies the conditions of being equivalent to or lighter than the metal foil and flexible.

  In addition, the sheet thickness can be made as thin as possible, and even if it is made thin, the mechanical strength against external force in the penetrating direction and tensile force in the surface direction can be increased, and further, translucency and transparency (“Translucency” simply refers to the property of allowing light to pass through, and “transparency” is distinguished from the property of being visible in addition to translucency). A sheet-like material that can be met has not been proposed yet.

  The present invention has been made in view of the above circumstances, and is not limited to applications that require electrical conductivity in the electronic and electrical fields (preferably in both the sheet surface direction and the sheet thickness direction), as well as thermal conductivity ( The sheet can be used in a wide variety of applications, such as applications requiring both sheet surface direction and sheet thickness direction), liquid shielding properties, and gas barrier properties, and is lighter and more flexible than metal foil. Providing sheet-like material that can respond to thickness reduction, mechanical strength enhancement, translucency and transparency, etc., so that it can be used as an electrode that connects both sides of the sheet. An object of the present invention is to provide a sheet having exposed good conductors on both sides, which can be suitably used as a heat conductive sheet for heat dissipation and heat absorption.

In order to achieve the above object, the present invention has taken the following measures.
That is, the sheet provided with the exposed good conductor on both sides according to the present invention is formed into a sheet shape using a resin as a shape retaining material, and the good conductor wire made of a good conductor embedded along the sheet surface direction is formed into a sheet thickness. The exposed good conductors are provided in a distributed manner on both sides of the sheet by meandering in the direction.

By forming the good conducting wire with a spread in the surface direction by a woven or knitted structure, meandering in the sheet thickness direction can be generated at a portion where the good conducting wires intersect.
The good conductive wire material is formed with a spread in the surface direction by a woven or knitted structure mixed with resin fibers, thereby causing meandering in the sheet thickness direction at a portion where the good conductive wire material and the resin fibers intersect. It may be a thing.

In this case, between the good conductor wire array formed in a series along the sheet surface direction and the array of the other good conductor wire array adjacent to and parallel to the good conductor wire array, the resin fiber allows the It is preferable that a resin region that retains the meandering of the good conductive wire array is formed.
The good conducting wire may have only one layer having a spread in the plane direction.

It is preferable that the exposed good conductor has a close contact structure in which the good conductive wire does not float on both sides of the sheet.
It is preferable that the interface portion between the good conducting wire and the resin and the inside of the resin have a non-porous structure to ensure liquid shielding and gas barrier properties between both surfaces of the sheet.
The resin preferably has translucency.

  The sheet having the exposed good conductor according to the present invention on both sides is not only used in the electronic and electrical fields (preferably both in the sheet surface direction and the sheet thickness direction), but also in thermal conductivity (preferably It can be used for a wide variety of applications such as sheet surface direction and sheet thickness direction), liquid barrier properties, and gas barrier properties, and is equivalent to or lighter than metal foil and flexible. The sheet thickness can be reduced, the mechanical strength can be increased, and translucency and transparency can be made possible, so it can be used as an electrode that connects both sides of the sheet, as well as for heat dissipation and heat absorption. It can also be suitably used as a heat conductive sheet or the like.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the sheet | seat provided with the exposed good conductor which concerns on this invention on both surfaces is shown, (a) is the schematic diagram which showed notionally the internal structure in the planar view state, (b) is (a). It is an AA sectional view taken on the line. It is the plane enlarged photograph (200 times) which showed 1st Embodiment of the sheet | seat which provided the exposure good conductor which concerns on this invention on both surfaces. It is a cross-sectional photograph (300 times) which showed 1st Embodiment of the sheet | seat provided with the exposed good conductor which concerns on this invention on both surfaces. It is the schematic diagram which showed notionally the internal structure in the planar view state about 2nd Embodiment of the sheet | seat provided with the exposure good conductor which concerns on this invention on both surfaces. It is a plane enlarged photograph (200 times) which showed 2nd Embodiment of the sheet | seat provided with the exposed good conductor which concerns on this invention on both surfaces. It is a cross-sectional photograph (300 times) which showed 2nd Embodiment of the sheet | seat provided with the exposed good conductor which concerns on this invention on both surfaces.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 3 show a first embodiment of a sheet 1 (hereinafter simply referred to as “sheet 1”) having exposed good conductors on both sides according to the present invention. 1A is a schematic diagram conceptually showing the internal structure, and FIG. 1B is a cross-sectional view taken along the line AA of FIG. FIG. 2 is an enlarged plan view, and FIGS. 3A and 3B are cross-sectional photographs showing the portions where the side cross-sectional structure appears in FIG.

  A sheet 1 according to the present invention is formed into a sheet shape using a resin as a shape-retaining material, and a good conductive wire 2 is embedded in the sheet (in the thickness of the resin) along the sheet surface direction. Has been. The good conducting wire 2 is formed into a shape (sheet shape) having a spread in the surface direction by a weaving structure by weaving or a knitting structure by weaving (collectively referred to as “weaving / knitting structure”). Hereinafter, the resin portion in the sheet is referred to as “resin layer 3”, and the sheet-like layer formed by the woven or knitted structure of the good conductive wire 2 is referred to as “good conductor layer 4”.

In the first embodiment, there is only one good conductor layer 4, and it can be said that the resin layer 3 is formed so that the good conductor layer 4 is confined (embedded) from both the front and back surfaces. . However, the good conductor layer 4 is meandering in the sheet thickness direction, and the good conductive wire 2 forming the good conductor layer 4 is formed in the portion of the resin layer 3 that is convex toward both the front and back surfaces. Is partially exposed to the outside. The exposed good conductor 5 is formed by this exposed portion. Such exposed good conductors 5 are arranged to be dispersed and scattered all over the front and back surfaces of the resin layer 3 (sheet 1).

  The good conducting wire 2 is formed of a metal strand, a metal-coated wire, carbon fiber, or the like. Metal strands and metal-coated wires have the advantage of high conductivity. Therefore, when these are used as the good conducting wire 2, the sheet 1 is excellent in utility as an electrode member. For example, it is suitable for electrodes used in heaters, batteries, sensors and the like. In addition, metal wires, metal-coated wires, and the like have an advantage of high thermal conductivity, so that they are excellent in utilization as a heat radiating member.

In contrast, carbon fibers and the like have the advantages of being lightweight and excellent in corrosion resistance. Therefore, when the carbon fiber is used as the good conductive wire 2, the sheet 1 is excellent in utilization to a moving body. For example, it is suitable as a current collector used in a fuel cell of a portable device, a wearable heater electrode, and an antistatic sheet installed in a suspended manner.
The metal that forms the surface coating on the material of the metal element wire or the metal-coated wire mainly focuses on the use required for the sheet 1 (uses that make use of electrical conductivity and thermal conductivity, etc.). What is necessary is just to select suitably taking into consideration the physical strength, cost, the ease of realization of the woven or knitted structure, and the like.

For example, when electrical conductivity is required, gold, platinum, silver, copper, nickel, chromium, iron, etc. are suitable. Also, copper, zinc, aluminum, tungsten, etc. are suitable if a point with high thermal conductivity is required, and stainless steel is preferred if a point with low thermal conductivity is required. .
In addition, even when both of these electrical conductivity and thermal conductivity are required, it is only necessary to select a metal having intermediate characteristics corresponding to each. Therefore, in addition to those described above, pure metals such as titanium, magnesium, tin, vanadium, molybdenum, and tantalum, and alloys thereof (brass, nichrome, etc.) can be used.

  As the metal strand, not only a continuous long wire but also a twisted single wire can be used. On the other hand, when the core material is a resin fiber, wire or animal or plant fiber in a metal-coated wire, a wet coating method or a powder adhesion method can be used, including plating treatment employed in resin plating methods, etc. Good. Further, when the core material is a metal wire, a thermal spraying method, a sputtering method, a CVD method, or the like can be employed.

  The good conductor layer 4 is configured such that the good conductive wires 2 intersect each other as the good conductive wire 2 has a woven or knitted structure, and the good conductive wire 2 forming the intersecting portion is at least Since one side gets over the other, it is inclined obliquely in the sheet thickness direction. That is, meandering in the sheet thickness direction in the resin layer 3 occurs due to the inclined portion of the good conductive wire 2.

  For example, in the case of a knitted structure, such an inclination occurs at a portion where the loops are entangled, and in the case of a woven structure, such an inclination occurs at a portion where warp and weft intersect. In the case of a woven structure, particularly in plain weaving and the like, there are many intersections of warp and weft, and when it becomes dense, the inclination angle becomes steep, and there may be a bent part where the straight line is bent. . Such a bent portion is also included in the “inclined portion”, and a structure in which the bent portion and a straight line are repeated is also included in the “meander in the sheet thickness direction”.

In order to make it easy to generate such an inclined portion, and to make the thickness of the sheet 1 not too thick, it is preferable to use a wire with a wire diameter of about 10 μm to 300 μm. Is done.
Of the knitted and knitted structures forming the good conductor layer 4, a flat knitted, smooth knitted, rubber knitted, pearl knitted or their changed structure (for example, Milan rib or corrugated cardboard knit) can be adopted. Naturally, for knitting, not only a circular knitting machine but also a flat knitting machine can be used. In addition, the organization knitted by the weft knitting as listed above may be a knitting organization (tricot knitting, Raschel knitting, Miranese knitting, etc.) knitting by warp knitting. On the other hand, plain weave, oblique weave, satin weave, entangled weave, etc. can be adopted as the weave structure.

  In addition, as the good conducting wire 2, it is possible to adopt a method in which a plurality of types of metal strands, metal-coated wires, or carbon fibers are mixed and their characteristics are utilized well. Furthermore, the good conducting wire 2 may be a mixture of these metal strands, metal-coated wires, or carbon fibers and non-conductive fibers. For example, a spun (spun) yarn can be used for blended yarn, covering yarn, or assortment. It is also possible to mix with a fiber having a melting point and a softening point higher than the heat setting temperature.

  On the other hand, the resin layer 3 does not expose the good conductive wire 2 beyond the wire diameter of the good conductive wire 2, and thereby the exposed good conductor 5 is in close contact with the sheet both surfaces so that the good conductive wire 2 does not float up. It has a structure. Here, “the good conducting wire 2 does not float” means that the good conducting wire 2 protrudes from the resin layer 3, “a void is generated between the resin layer 3 and the good conducting wire 2. It means "not."

  Therefore, for example, when the good conductive wire 2 is lifted on the front and back surfaces of the good conductor layer 4 (not covered with the resin layer 3) (for example, the intersection of the good conductive wires 2 (= overcoming portion) )) Is naturally included. In addition, the good conducting wire 2 exposes all the wire diameters on the front and back surfaces of the resin layer 3, but also includes the case where no void is generated by the good conducting wire 2 contacting the front and back surfaces of the resin layer 3. It is a waste. For example, even if the good conductive wire 2 is exposed in a loop shape on the front and back surfaces of the resin layer 3, the loop is bent along the front and back surfaces of the resin layer 3 (to fit in) and brought into a close contact state. This is the case.

  The resin used for the resin layer 3 is mainly used for applications required for the sheet 1 (for example, applications utilizing translucency and transparency), and includes solvent resistance, mechanical strength, cost. What is necessary is just to select suitably considering etc. It can be said that it is preferable to use a crystalline thermoplastic resin. Among them, it is preferable to select one having a low viscosity in order to make it difficult for bubbles to be generated at the time of heating and melting, and to improve adhesion to the good conductor layer 4 and permeability. In terms of MFR, it is about 1-50. However, an amorphous thermoplastic resin or a thermosetting resin can be used depending on the application.

  As an example, crystalline thermoplastic resins include polyethylene, polypropylene, nylon (such as nylon 6, nylon 66, etc., which is a fiber formed by spinning a long chain continuous synthetic polymer by amide bonds. General synthetic fiber), polyester, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, polyether ether ketone, PFA, PVDF, ETF, and other fluororesins.

Amorphous thermoplastic resins include polystyrene, polycarbonate, polysulfone, polyethersulfone, and the like. Examples of the thermosetting resin include epoxy, silicone, phenol, urethane, and polyimide resin.
There are roughly the following three methods for forming the resin layer 3. The first method is a method in which a resin is previously incorporated into the good conductor layer 4 (woven and knitted structure of the good conductive wire 2), and the resin incorporated by heating after the formation of the good conductor layer 4 is cured. Specifically, resin incorporation into the good conductor layer 4 uses the good conducting wire 2 covered or twisted by the resin fiber, plating or aligning the resin wire or resin fiber, or inlay to the good conducting wire 2. The method of making it mix can be mentioned. The resin fiber used may be monofilament or multifilament.

  A second method of forming the resin layer 3 is a method of laminating the good conductor layer 4 with a resin. Specifically, the good conductor layer 4 is laminated and integrated by heating and pressurizing the resin sheet on at least one surface, preferably both the front and back surfaces. Instead of stacking the resin sheets, a resin melted by heating or a solvent may be sprayed, poured, or applied by a roller, and cured.

When heating and pressurizing the resin sheet on the good conductor layer 4, the rolling force, heating temperature, pressurization speed (conveying speed at the time of roller press), etc. are set so that no bubbles remain in the good conductor layer 4. It is necessary to set in detail. In that sense, the resin may be selected in consideration of the relationship with the melting point and the melt viscosity and the relationship with the layer thickness of the resin layer 3.
A third method for forming the resin layer 3 is a method in which the first method (resin incorporation method) and the second method (laminating method) are used in combination. In the first method, a method of using the good conducting wire 2 covered with resin fibers is selected, and in the second method used in combination with this, the same resin used for covering in the first method is used. When a method using a resin sheet is selected, a situation is obtained in which the contact between the good conducting wire 2 and the resin becomes easy, and a non-porous structure is formed in the resin. And gas barrier properties are preferred.

  The layer thickness of the resin layer 3 can be increased or decreased as desired, but the thinner the thickness, the easier it is to generate bubbles. There is also a risk of pinholes that adversely affect liquidity, gas barrier properties, and mechanical strength. Therefore, the layer thickness of the resin layer 3 is preferably set in the range of about 10 to 1000 μm. In particular, the range of 20 to 200 μm is more preferable. However, even if bubbles are generated, it is not necessary to reach the pinhole (through hole that passes through in the sheet thickness direction), and it is of course possible to have bubbles to the extent that no pinhole is formed. .

  By the way, in FIG. 2 which shows this 1st Embodiment, the site | part which became cloudy white has arisen so that it may cling to the surrounding part of the good conducting wire 2. FIG. This white and cloudy portion is a copy of this metal component by using the good conducting wire 2 covered with resin fibers containing a metal component (titanium oxide powder or the like). The resin fiber used for covering is for providing the resin layer 3 as described above. Needless to say, when a resin fiber that does not contain a metal component is used as a covering yarn, or when a non-covering material is used as the good conductive wire 2, the white turbid portion does not occur and the transparency of the resin layer 3 does not occur. Becomes even higher (infinitely close to transparency).

  4 to 6 show a second embodiment of the seat 1 according to the present invention. The second embodiment is most different from the first embodiment in that the good conductor layer 4 (woven / knitted structure) is formed by mixing the good conducting wire 2 and the resin fiber 10. Therefore, at the portion where the good conducting wire 2 and the resin fiber 10 intersect, the good conducting wire 2 immediately after weaving meanders in the sheet thickness direction, and this meandering state is retained by plastic deformation of the good conducting wire 2. As a result, the exposed good conductor 5 is formed by this meandering.

The resin fiber 10 is melted at the stage where the good conductor layer 4 is heated and pressed, and is cured by being integrated with a resin for the resin layer 3 (such as a resin sheet for laminating). Therefore, in the sheet 1 as the final shape, a single arrangement of the good conducting wire 2 (for example, a so-called “course” in which a sinker loop and a needle loop or a dial loop and a cylinder loop are alternately arranged in a knitted structure) However, the structure is such that it remains in the resin layer 3 in a state (independent state) deviated from other arrangements.

  Therefore, a good conductive wire array (see arrow A in FIG. 4) formed in series along the sheet surface direction and another good conductive wire adjacent to and parallel to this good conductive wire array (A). Between the arrangements (see arrow B in FIG. 4), the meandering of the good conducting wire arrangements (A) and (B) is maintained only by the resin fibers 10 (not including the good conducting wire 2). A resin region 12 to be formed is formed. Thus, the sheet 1 is rich in flexibility and more excellent in transparency.

Also in FIG. 5 showing the second embodiment, a white and cloudy portion is generated so as to cling to the peripheral portion of the good conducting wire 2 as in the case of FIG. 2 of the first embodiment. This white and cloudy part is also a copy of the metal component (titanium oxide powder) of the resin fiber covering the good conductive wire 2.
In the resin fiber 10, it is also possible to use a resin having a high melting point (for example, a resin that does not melt at the heat setting temperature). In this case, since the resin fiber 10 is not melted even under heating, there is an advantage that the meandering generated in the good conductive wire 2 can be clearly left without being deformed.

  As is apparent from the above description, the sheet 1 of the present invention is not only used for applications that require electrical conductivity in the electronic and electrical fields (preferably both in the sheet surface direction and the sheet thickness direction), but also in heat conduction. It is possible to cope with a wide variety of uses such as a property (preferably both in the sheet surface direction and the sheet thickness direction), a liquid shielding property, and a gas barrier property. Further, the sheet 1 of the present invention is equivalent to or lighter than metal foil and is flexible, and the sheet thickness is reduced, the mechanical strength is increased, translucency and transparency are made possible, and the like. It has become a flexible response.

  That is, the sheet 1 of the present invention can be used as an antistatic sheet, a static elimination sheet, an electromagnetic wave shielding sheet in applications that require electrical conductivity in the electronic and electrical fields, and as an electrode substrate that conducts between both surfaces of the sheet. For example, it can be suitably applied to an intermediate electrode substrate of a tandem solar cell. Also, in applications that require thermal conductivity, liquid shielding, and gas barrier properties, it can be used as a heat conductive sheet for heat dissipation and heat absorption, so for example, a joining member or a heat dissipation pipe, a building material, an interior material, It can be suitably applied to clothing and the like.

Hereinafter, examples in the case of mainly applying a laminating method and a covering method of resin fibers will be exemplified, but these are disclosed for assisting technical understanding, and the technical scope of the present invention is as follows. It is not limited to the illustration.
Example 1
The knitted structure of the good conductor layer 4 is a knitted structure by rubber knitting (milling knitting). As the good conductive wire 2, a SUS304 wire having a wire diameter of 35 μm was used as a core material and covered with a 56 dtex polypropylene fiber around the SUS304 wire.

The resin layer 3 was formed by laminating an OPP (biaxially stretched polypropylene) resin film having a thickness of 25 μm extruded from polypropylene on both the front and back surfaces of the good conductor layer 4 and heating and pressurizing them by a laminating method to melt and complex the OPP resin film.
The sheet thickness of the obtained sheet 1 was 130 μm.
(Example 2)
A smooth knitting structure was adopted as the knitting structure of the good conductor layer 4. The good conductive wire 2 was a nickel wire having a wire diameter of 40 μm, covered with a low melting point polyester fiber of 56 dtex.

The resin layer 3 has an OPP resin film having a thickness of 25 μm overlapped on one surface of the good conductor layer 4 and an OPP resin film having a thickness of 50 μm overlapped on the other surface of the good conductor layer 4 and is heated and pressed by a laminating method. The film was melted and combined.
The sheet thickness of the obtained sheet 1 was 140 μm.
(Example 3)
A smooth knitting structure was adopted as the knitting structure of the good conductor layer 4. As the good conducting wire 2, a wire in which a nickel wire having a wire diameter of 40 μm and a 56 dtex polypropylene fiber were aligned was used.

The resin layer 3 was formed by laminating a CPP (non-axially stretched polypropylene) resin film having a thickness of 25 μm extruded from polypropylene on both the front and back surfaces of the good conductor layer 4 and heating and pressurizing by a laminating method to melt and composite the CPP resin film.
The sheet thickness of the obtained sheet 1 was 125 μm.
Example 4
For the good conductor layer 4, a knitted structure by smooth knitting in which the milling structure of the good conducting wire 2 and the milling structure of the resin fiber 10 seem to overlap each other was adopted. As the good conductive wire 2, a SUS304 wire having a wire diameter of 35 μm was used as a core material and covered with a 56 dtex polypropylene fiber around the SUS304 wire. In addition, the resin fiber 10 was obtained by aligning two 56 dtex polypropylene fibers.

Only this good conductor layer 4 was heated and pressurized to melt and composite the resin fiber 10.
The sheet thickness of the obtained sheet 1 was 130 μm.
(Example 5)
The good conductor layer 4 is a cross knitting of the good conductive wire 2 and the resin fiber 10, and the knitting structure of the rubber knitting (milling knitting) is adopted as the woven knitting structure. For the good conductive wire 2, 78 dtex nylon fiber plated with 0.1 μm thick silver was used. In addition, the resin fiber 10 was obtained by aligning two 56 dtex polypropylene fibers.

The resin layer 3 was formed by laminating a CPP resin film having a thickness of 25 μm on both the front and back surfaces of the good conductor layer 4 and heating and pressurizing by a laminating method to melt the CPP resin film.
The sheet thickness of the obtained sheet 1 was 110 μm.
(Example 6)
The weaving and knitting structure of the good conductor layer 4 is a plain weaving structure. As the good conducting wire 2, a nickel wire having a wire diameter of 40 μm was used. The resin fiber 10 was a 56 dtex polypropylene fiber.

For the resin layer 3, a CPP resin film having a thickness of 50 μm was superposed on both the front and back surfaces of the good conductor layer 4, and heated and pressed by a laminating method to melt and composite the CPP resin film.
The sheet thickness of the obtained sheet 1 was 100 μm.
(Example 7)
The good conductor layer 4 is a cross knitting of the good conductive wire 2 and the resin fiber 10, and the knitting structure of the rubber knitting (milling knitting) is adopted as the woven knitting structure. As the good conducting wire 2, a copper wire having a wire diameter of 40 μm was used as a core material, which was covered with a 56 dtex nylon fiber around the copper wire.

The resin layer 3 was formed by laminating a 100 μm thick nylon resin extrusion film on one surface of the good conductor layer 4 and heating and pressurizing by a laminating method to melt the nylon resin extrusion film to form a composite.
The sheet thickness of the obtained sheet 1 was 150 μm.
(Comparative Example 1)
A smooth knitting structure was adopted as the knitting structure of the good conductor layer 4. As the good conductive wire 2, a SUS304 wire having a wire diameter of 35 μm was used as a core material and covered with a 56 dtex polypropylene fiber around the SUS304 wire.

The resin layer 3 was formed by laminating an OPP resin sheet having a thickness of 25 μm on both the front and back surfaces of the good conductor layer 4 and heating and pressurizing by a laminating method to melt the OPP resin film. At that time, a gravure roll having projections was used as a roll of the laminating machine, and a through-hole passing through in the sheet thickness direction was formed in the sheet.
The sheet thickness of the obtained sheet was 115 μm.
(Comparative Example 2)
The good conductor layer 4 is a cross knitting of the good conductive wire 2 and the resin fiber 10, and the knitting structure of the rubber knitting (milling knitting) is adopted as the woven knitting structure. The good conductive wire 2 was a nickel wire having a wire diameter of 40 μm, which was covered with a 56 dtex polypropylene fiber around it.

The resin layer 3 was formed by superimposing two CPP resin sheets having a thickness of 50 μm on both the front and back surfaces of the good conductor layer 4 and heating and pressurizing them by a laminating method to melt the CPP resin film. At that time, both the temperature and the pressure were controlled to be low so that the good conductive wire 2 was not exposed on the sheet surface.
The sheet thickness of the obtained sheet was 150 μm.
(Comparative Example 3)
For the good conductor layer 4, a knitted structure by smooth knitting in which the milling structure of the good conducting wire 2 and the milling structure of the resin fiber 10 seem to overlap each other was adopted. The good conductive wire 2 was a nickel wire having a wire diameter of 40 μm, which was covered with a 56 dtex polypropylene fiber around it. The resin fiber 10 was a 56 dtex polypropylene fiber.

Only this good conductor layer 4 was heated and pressurized to melt and composite the resin fiber 10. At that time, the winding amount of the covering yarn (polypropylene fiber amount) with respect to the good conducting wire 2 was adjusted to be small so that a through hole was formed in the sheet.
The sheet thickness of the obtained sheet was 125 μm.
(Summary)
The results for Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1.

In addition, regarding [Pinhole] in the table, evaluation is performed by JISK7126-1A (differential pressure method) which is a method for measuring the oxygen permeability of a gas barrier film, and the gas pressure difference between the front and back surfaces of the set test sheet cannot be maintained. It was judged that there was a pinhole.
[Surface observation result] is an evaluation based on the appearance using a microscope, unlike the above-mentioned [pinhole] in which substantial leakage was evaluated. Here, the “through hole” is basically the same as the pin hole, but is expressed including the hole intentionally formed by the gravure roll in Comparative Example 1.

  Furthermore, regarding [inter-surface conductivity], based on the volume resistivity measurement of the film of JISC2151, the test sheet is sandwiched between an electrode plate having a diameter of 40 mm and a copper plate wider than that from both sides, and between the electrode plates. When the resistance value was measured with a tester, if the resistance value was 1Ω or less, it was judged to be conductive. That is, the presence or absence of conductivity in the sheet thickness direction is evaluated.

  [Thickness] was measured three times using a PEACOCK digital thickness gauge manufactured by Ozaki Seisakusho, and the average was used.

As is clear from Table 1, in Examples 1 to 7 which are the sheets 1 according to the present invention, no pinholes were observed, and good conductivity was obtained.
On the other hand, in Comparative Examples 1 and 3, a large number of pinholes were recognized although they had conductivity. In Comparative Example 2, no pinhole was observed, but no conductivity was obtained.

By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.
Since the use of the sheet 1 according to the present invention is not limited, if the configuration is such that the exposed good conductor 5 is formed by meandering the good conductive wire 2 in the sheet thickness direction, the required use (conductivity) The thickness of the sheet, the structure of the good conductor layer 4, the material used for the good conductor layer 4 and the resin layer 3, the manufacturing process, and the like can be changed as appropriate.

Needless to say, the application utilizing the translucency and transparency is not limited, and therefore the resin used for the resin layer 3 is not limited to have translucency or transparency. .
The good conductor layer 4 may be a plurality of layers. The resin layer 3 may have flexibility or may have no flexibility (hard plate shape).

Further, the sheet shape is not limited to any final shape (usage shape). For example, the sheet shape is formed in a tube shape or a hose shape and is used for conveying a fluid refrigerant or a heat medium. It is also possible to provide.
In the woven and knitted structure of the good conductor layer 4, the rubber knitting is exemplified as an example of the knitting structure. However, the rubber knitting includes not only the 1 × 1 rubber knitting but also the 2 × 2 rubber knitting, the 3 × 3 rubber knitting, and the 3 × 1 rubber. Needless to say, knitting and 5 × 2 rubber knitting are also included. In the present specification, in the rubber knitting, in particular, when referring to a 1 × 1 rubber knitting, “(milling knitting)” is appended.

DESCRIPTION OF SYMBOLS 1 Sheet | seat which provided the exposed good conductor on both surfaces 2 Good conducting wire material 3 Resin layer 4 Good conductor layer 5 Exposed good conductor 10 Resin fiber 12 Resin area | region

Claims (8)

  It is formed into a sheet shape using resin as a shape-retaining material, and exposed good conductors are distributed on both sides of the sheet by meandering good conductors made of good conductors embedded along the sheet surface direction in the sheet thickness direction. A sheet provided with exposed good conductors on both sides, characterized in that it is provided.   The meander wire in the sheet thickness direction is generated at a portion where the good conducting wires intersect each other by forming the good conducting wire with a spread in a plane direction by a woven or knitted structure. A sheet comprising the exposed good conductor according to 1 on both sides.   The good conducting wire is formed to have a meandering in the sheet thickness direction at a portion where the good conducting wire and the resin fiber intersect by forming a spread in the surface direction by a woven or knitted structure mixed with resin fiber. A sheet comprising the exposed good conductor according to claim 1 on both sides.   Between the good conducting wire array formed by being connected in series along the sheet surface direction and the other good conducting wire arrangement adjacent to and parallel to the good conducting wire arrangement, the good conducting wire is provided by the resin fiber. 4. A sheet provided with exposed good conductors on both sides, wherein resin regions are formed to retain the meandering of the array.   The sheet having the exposed good conductor according to any one of claims 1 to 4, wherein the good conducting wire has only one layer having a spread in a plane direction. .   The sheet having both exposed good conductors according to any one of claims 1 to 5, wherein the exposed good conductor has a close-contact structure in which a good conductive wire does not float on both sides of the sheet. .   The contact interface portion between the good conducting wire and the resin and the inside of the resin have a non-porous structure, and liquid shielding properties and gas barrier properties are secured between both surfaces of the sheet. The sheet | seat provided with the exposed good conductor of any one of Claims on both surfaces.   The sheet having the exposed good conductor according to any one of claims 1 to 7, wherein the resin has translucency.