JP2009091697A - Electrically conductive mesh form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically conductive mesh form suitably usable for application requiring air permeability, liquid permeability, or visual check. <P>SOLUTION: The electrically conductive mesh form is such that a metallic coating film is formed on the surface of a uniaxially oriented thermoplastic resin film as a raw material, or an electrically conductive substance-containing uniaxially oriented thermoplastic resin film or metallic foil is used as a raw material. Therefore, the mesh form is electrically conductive, hardly causes the problems of uncomfortable feeling in its use or of tending to deposit dust thereon, or disaster such as a fire or an explosion, which is caused by charged static electricity. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes various agricultural materials such as agricultural films, automotive materials such as automotive interior materials and automotive ceiling materials, packaging materials such as packaging films, paper bags and packaging materials, and building materials such as water permeable sheets. The present invention relates to a conductive mesh that can be used as a material reinforcement, a reinforcement constituting a moisture permeable waterproof sheet, an electromagnetic wave shielding material for an electronic display device, a static elimination sheet material, a grounding sheet material, a battery separator, or the like.

  For textile products such as woven fabrics and nonwoven fabrics used in various industrial fields, if static electricity is charged on the textile product, the static electricity is discharged to the textile product operator, causing discomfort or dust adhering to the textile product. Not only the problem that it becomes easy to do, but it may cause a fire and an explosion, so that those having conductivity are often used.

  As such a fiber product having electrical conductivity, for example, Patent Document 1 discloses a fiber assembly mainly composed of conductive fibers and thermoplastic synthetic fibers, which is a portion accompanied by fusion and solidification of thermoplastic synthetic fibers. By providing an embossed pattern by mechanical compression, the compressed part is a conductive part with relatively many intersection contacts between conductive fibers, and the non-compressed part is a weakly conductive part with relatively few intersection contacts between conductive fibers Conductive nonwovens have been proposed.

  However, the conductive nonwoven fabric has insufficient air permeability and may not be used for applications requiring air permeability such as a moisture-permeable waterproof sheet.

  Further, the conductive nonwoven fabric has almost no gap, and when the conductive nonwoven fabric is used as a reinforcing body for agricultural films or packaging films, the inside of the agricultural house with the agricultural film stretched from the outside of the agricultural house. Since it becomes difficult to visually recognize and the product packaged with the packaging film from the outside, it has been difficult to use it for applications that require visibility.

JP 2007-113148 A

  The present invention provides a conductive network that can be suitably used for applications that require air permeability, applications that require liquid to pass through, and applications that require visibility.

  The conductive network of the present invention is characterized in that a metal film is formed on the surface of a network using a uniaxially stretched thermoplastic resin film as a raw material.

  As a net-like body made of the above-mentioned uniaxially stretched thermoplastic resin film, in addition to a net-like body formed by forming a number of through-holes penetrating between both surfaces of a uniaxially stretched thermoplastic resin film in a known manner Also included are nets as shown below.

  As the net 1 formed from a uniaxially stretched thermoplastic resin film, for example, as shown in FIG. 1 or 2, a large number of flat yarns 1a, 1a,... A flat yarn row 1B formed by arranging a plurality of flat yarns 1b, 1b,... At a predetermined interval in a direction oblique or perpendicular to the flat yarn 1a of the flat yarn row 1A. A plurality of through holes 1c are provided by integrating the intersections of the flat yarns 1a and 1b of these flat yarn rows 1A and 1B by a known means such as heat fusion or adhesive. A flat yarn array in which a large number of flat yarns 1d, 1d,... Are arranged in parallel at small intervals on one surface of the net or the net thus obtained, as shown in FIG. 1D is the two rows of frames forming the mesh. The yarns are overlapped in a direction oblique to the yarn rows 1A and 1B, and the intersection of the flat yarn 1a (1b) of the flat yarn row 1A (1B) and the flat yarn 1d of the flat yarn row 1D is bonded or bonded by heat fusion. A net-like body formed so as to be integrated and provided with a large number of through holes 1c can be given.

  The flat yarns 1a, 1b, and 1d include a strip formed by cutting an unstretched thermoplastic resin film at a predetermined width in the length direction, and a uniaxially stretched thermoplastic resin film. What cut | disconnects by predetermined width in the direction orthogonal to the extending | stretching direction etc. are mentioned.

Further, in addition to the mesh body 1, a mesh body 2 as shown in FIG. Specifically, the net 2 includes a wide net 2A formed by arranging a large number of wide nets 2a, 2a,... At predetermined intervals, and a wide net 2a adjacent to each other. A direction in which a large number of narrow-width net portions 2b, 2b,. It is composed of a narrow-width mesh portion row 2B arranged in parallel at predetermined intervals (in the length direction of the wide-width mesh portion 2a), and is passed by a portion surrounded by the thick-width mesh portion 2a and the narrow-width mesh portion 2b Two nets formed with holes 2C are a first net 21 and a second net 22, and the first and second nets 21 and 22 are connected to each other with their wide webs 2a and 2a. Stacked and integrated in an orthogonal or skewed state.

  As shown in FIG. 6 and FIG. 7, as the method for manufacturing the mesh body 2, two uniaxially stretched thermoplastic resin films 4, 4 are prepared, and a slit of a certain length is formed in each uniaxially stretched thermoplastic resin film 4. A plurality of 4a, 4a, the length direction of which coincides with the stretching direction, and slits 4a, 4a adjacent to each other in the stretching direction are partially overlapped to form a slit row 4A, The slit rows 4A are formed at predetermined intervals in a direction orthogonal to the extending direction. Note that the slits 4a, 4a, and the like, when focusing on one slit 4a, are a slit 4a 'overlapping on one end side of the slit 4a and a slit 4a "overlapping on the other end side of the slit 4a. Are formed to be opposite to each other across the slit 4a.

  Next, each uniaxially stretched thermoplastic resin film 4 is pulled in a direction (width direction) orthogonal to the stretching direction to expand the slits 4a, 4a,. The first and second reticulate bodies 21 and 22 are formed with the film portion as the wide net portion 2a and the film portion between the slits 4a and 4a as the narrow net portion 2b. , 22 thick net portions 2a, 2a are superposed in a slanted or orthogonal state, and the first and second mesh bodies 21, 22 are bonded to each other through heat fusion or an adhesive. The net-like body 2 can be manufactured by stacking and integrating.

  Further, as shown in FIG. 8, the mesh body 3 is plain woven with flat yarns as warps 31 and wefts 32, and the intersection of the warps 31 and the wefts 32 is integrated by an adhesive or heat fusion, As shown in FIG. 9, a mesh body in which a large number of through holes 33, 33... Are provided by a gap surrounded by the warp 31 and the weft 32, and one surface of the mesh body thus obtained are shown in FIG. Further, in the direction oblique to the warp 31 and the weft 32 of the net-like body, the flat yarn row 34 formed by arranging a large number of flat yarns 34a, 34a,. And a weft 32 and a net-like body provided with a plurality of through holes formed by integrating the intersections of the flat yarns 34a, 34a,... Can be mentioned.

  The flat yarn constituting the nets 1 and 3 is a uniaxially stretched tape in which a thermoplastic resin film is heated to an appropriate temperature below the melting point, preferably below the melting point, and stretched several times in the longitudinal direction to form a tape. It is. As the flat yarn production method, for example, (1) a thermoplastic resin is supplied to an extruder, melt-kneaded, and then extruded from the extruder to form a thermoplastic resin film. A method of producing a flat yarn by cutting a strip in the extrusion direction at predetermined intervals in the width direction (direction perpendicular to the extrusion direction), and stretching the strip in the length direction by 2 to 10 times. (2) After supplying the thermoplastic resin to the extruder and melt-kneading, it is extruded from the extruder to form a thermoplastic resin film, and this thermoplastic resin film is stretched 2 to 10 times in the longitudinal direction. Examples include a method of producing a flat yarn by producing a uniaxially stretched thermoplastic resin film and cutting the uniaxially stretched thermoplastic resin film into a predetermined width so that the stretch direction is the length direction of the flat yarn.

  Moreover, it does not specifically limit as a thermoplastic resin which comprises the thermoplastic resin film used for manufacture of the said flat yarn, For example, a low density polyethylene, a high density polyethylene, a linear low density polyethylene, ethylene-alpha-olefin Polyethylene resins such as copolymers, polyolefin resins such as polypropylene resins such as isotactic polypropylene; polyester resins; polyamide resins; polyurethane resins, etc. These thermoplastic resins are used alone. Or 2 or more types may be used together. Examples of the α-olefin constituting the ethylene-α-olefin copolymer include propylene, 1-butene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1- Examples include octene.

  Of these thermoplastic resins, polyethylene resins are preferred. This is because, by using a polyethylene-based resin having excellent heat laminating suitability, the conductive net can be firmly and heat-integrated and integrated with other members at the net portion where the metal film described later is not formed. It is. In addition, as another member, the microporous film, agricultural film, packaging film, etc. which comprise a moisture-permeable waterproof sheet are mentioned.

  Furthermore, an additive such as a weathering agent may be added to the thermoplastic resin film used in the production of the flat yarn as long as the effect of the present invention is not impaired.

  And the electroconductive network of this invention has the metal membrane | film | coat formed in the surface of the said mesh bodies 1-3, and electroconductivity is exhibited by this metal membrane | film | coat. In addition, since the point which forms the metal film on the surface of the mesh-like bodies 1-3 is the same for any of the mesh-like bodies 1-3, in the following description, when referring to the drawings, the mesh-like body 1 is shown as the drawing. Only a case where a metal film is formed is shown as a representative example.

  As shown in FIG. 10, the metal film 5 is formed on both surfaces of the mesh bodies 1 to 3, or as shown in FIGS. 11 and 12, any one of the mesh bodies 1 to 3. It may be formed only on the surface. Note that a metal film may or may not be formed on the end surfaces of the flat yarns 1a, 1b, 1d, the thick-width mesh portion 2a, or the narrow-width mesh portion 2b constituting the mesh-like bodies 1-3.

  It does not specifically limit as a method of forming a metal membrane | film | coat on the surface of the nets 1-3, For example, methods, such as sputtering, vapor deposition, and wet plating, are mentioned, Sputtering and vapor deposition are preferable.

  Moreover, it does not specifically limit as a metal which forms the metal membrane | film | coat 5, For example, copper, silver, aluminum, carbon, an alloy etc. are mentioned, Copper, silver, and aluminum are preferable. In addition, the metal film 5 may be comprised from one type of metal, or may contain 2 or more types of metals.

  In the conductive network described above, the case where the metal film 5 is formed on the surfaces of the networks 1 to 3 has been described. As a raw material for the network, a uniaxially stretched thermoplastic resin film containing a conductive material is used. It may be used. Thus, by using a uniaxially stretched thermoplastic resin film containing a conductive material as a raw material, as described above, conductivity is imparted to the network without forming a metal film on the surface of the network. The network can be a conductive network. In addition, since the formation procedure of a mesh body is the same procedure as the above except that the conductive material is contained in the uniaxially stretched thermoplastic resin film, the description thereof is omitted. In the flat yarn manufacturing method, the conductive material may be supplied to the extruder together with the thermoplastic resin.

  The conductive material is not particularly limited, and examples thereof include graphite, carbon fiber, carbon black, aluminum powder, nickel powder, and the like. Carbon black is used because it is stable in supply and easy to process. preferable. These conductive substances may be used alone or in combination of two or more.

  Furthermore, the case where a uniaxially stretched thermoplastic resin film is used as a raw material for the network has been described. However, a metal foil may be used as the raw material for the network, and thus the conductive material is made conductive by using the metal foil. And the network can be made into a conductive network.

  In addition, it does not specifically limit as a metal which comprises the said metal foil, The thing similar to the metal which forms the above-mentioned metal membrane | film | coat 5 is mentioned.

  In order to produce a conductive network using a metal foil, an unstretched metal foil is cut at a predetermined width, and a strip formed by cutting an unstretched metal foil at a predetermined width. What is formed by stretching in the longitudinal direction, or what is obtained by cutting a uniaxially stretched metal foil into a predetermined width in a direction perpendicular to the stretching direction, is woven as warp and weft instead of flat yarn. What is necessary is just to produce an electroconductive net | network body like the net | network 8.

  In the conductive network of the present invention, a metal film is formed on the surface of a network formed from a uniaxially stretched thermoplastic resin film, or a uniaxially stretched thermoplastic resin film or metal foil containing a conductive material is used as a raw material. Because it is made of a net-like material, it has electrical conductivity and causes problems such as discomfort during use and easy adhesion of dust, and disasters such as fires and explosions due to static electricity. There is almost no.

  The conductive network according to the present invention is formed in a network and has good breathability, and therefore uses for breathability such as a moisture permeable waterproof sheet, that is, a reinforcing body for a microporous film. Can also be used suitably.

  In addition, since the conductive mesh body has sufficient through holes to be seen through, when used as a reinforcing body for agricultural films, packaging films, etc., through the through holes of the conductive mesh body, The inside of the agricultural house on which the film is stretched can be viewed from the outside of the agricultural house, or the product packaged by the packaging film can be viewed from the outside.

  Furthermore, since the said conductive net-like body is formed in a net-like shape and allows a liquid to sufficiently pass therethrough, it can also be suitably used for applications such as a reinforcing member for a water-permeable sheet and a battery separator.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Example 1
First, a uniaxially stretched low-density polyethylene layer (melting point of low-density polyethylene: 107 ° C., width: 3 mm, thickness) on both sides of a uniaxially stretched high-density polyethylene layer (melting point of high-density polyethylene: 135 ° C., width: 3 mm, thickness: 24 μm). : 3 μm) was prepared as a flat yarn (width: 3 mm, thickness: 30 μm, fineness: 840 dt).

Next, a number of the flat yarns 1a, 1a,... Subsequently, on the flat yarn row 1A, a large number of the flat yarns 1b, 1b,... Are arranged in parallel in the direction perpendicular to the flat yarn 1a of the flat yarn row 1A at an interval of 5.54 mm. 1B was formed. Then, the intersections of the flat yarns 1A and 1b of the flat yarn row 1A and the flat yarn row 1B were heat-sealed at a temperature of 120 ° C., thereby producing a network as shown in FIG. The net-like body had 117 flat yarns 1a and 1b arranged in parallel in each of the flat yarn row 1A and the flat yarn row 1B per 1 m ² , and the opening ratio was 42%.

Subsequently, high-purity aluminum (purity: 99.999% (5N), conductivity: 37... Is applied to the entire surface of the mesh body and the entire surface of both ends in the width direction of the flat yarns 1a and 1b by a known low-temperature sputtering method. 7 × 10 ⁶ / mΩ) was formed to form a conductive network.

  Furthermore, a microporous film (low-density polyethylene melting point: 107 ° C., thickness: 40 μm) made of low-density polyethylene and having fine through-holes formed on the entire surface is overlaid on the other surface of the conductive network. A laminated body is manufactured together, and the laminated body is heated and compressed in the thickness direction at 105 ° C. to obtain a conductive moisture-permeable waterproof sheet in which the conductive network and the microporous film are laminated and integrated. It was.

  And it has excellent moisture-permeable and waterproof property by constructing the conductive moisture-permeable waterproof sheet obtained as described above in the gap inside the housing wall by the construction technique of moisture-permeable waterproof sheet according to JIS A6111. The wall surface of the house with conductivity was also obtained. The amount of dust adhering to the wall surface of the house was significantly smaller than that of the house wall surface on which the moisture-permeable waterproof sheet having no conductivity was applied.

  Further, the conductive moisture-permeable waterproof sheet was reinforced by a conductive mesh, and it could be applied beautifully in the gap inside the housing wall without causing wrinkles or tears. On the other hand, when a conductive microporous film formed by imparting conductivity to the surface of a microporous film that does not have a reinforcing body is applied to a gap inside a housing wall by the above technique, The microporous film was wrinkled and torn and could not be beautifully constructed.

  Conventionally, if the moisture-permeable waterproof sheet and the electromagnetic wave shielding material are not separately constructed, it was impossible to achieve both moisture-permeable and waterproof properties. The moisture permeable waterproof sheet and the electrical conductivity can be achieved by the construction of the moisture permeable waterproof sheet.

It is the top view which showed the net-like body. It is the top view which showed another example of the net-like body. It is the top view which showed another example of the net-like body. It is the top view which showed another example of the net-like body. It is the top view which showed another example of the net-like body. It is a disassembled perspective view of the mesh body of FIG. It is the perspective view which showed the uniaxially stretched thermoplastic resin film used as the raw material of the mesh body of FIG. It is the top view which showed another example of the net-like body. It is the top view which showed another example of the net-like body. It is the longitudinal cross-sectional view which showed the electroconductive net-like body. It is the longitudinal cross-sectional view which showed another example of the electroconductive net-like body. It is the longitudinal cross-sectional view which showed another example of the electroconductive net-like body.

Explanation of symbols

1-3 Conductive network
1A flat yarn row
1B Flat yarn row
1D flat yarn row
1a flat yarn
1b flat yarn
1c through hole
1d flat yarn
2A Thick web section
2B Narrow line section
2C through hole
2a Thick web
2b Narrow web
31 Warp
32 Weft
33 through holes
34 flat yarn rows
34a flat yarn
4A Slit row 4 Uniaxially stretched thermoplastic resin film

Claims (7)

A conductive network having a metal film formed on a surface of a network made of a uniaxially stretched thermoplastic resin film. 2. The conductive network according to claim 1, wherein a metal film is formed on the surface of the network by sputtering or vapor deposition. 2. The conductive network according to claim 1, wherein the uniaxially stretched thermoplastic resin film contains a polyethylene resin. A conductive network comprising a network made of a uniaxially stretched thermoplastic resin film or metal foil containing a conductive material. A net-like body is formed by arranging a number of flat yarns arranged in parallel at predetermined intervals, and a plurality of flat yarns arranged in parallel at predetermined intervals in a direction intersecting the flat yarns of the flat yarn rows. 5. The conductive material according to claim 1 or 4, comprising a plurality of flat yarn rows, wherein a plurality of through holes are provided by integrating the intersections of the flat yarn rows of these flat yarn rows. Reticulated body. A net-like body is connected in a state in which a large-width mesh portion row in which a large number of thick-width mesh portions are arranged in parallel at predetermined intervals, and a wide-width mesh portion adjacent to each other is skewed with respect to the wide-width mesh portion. A plurality of narrow mesh sections arranged in parallel at predetermined intervals, and a through hole is formed by a portion surrounded by the wide mesh section and the narrow mesh section 5. The conductive network according to claim 1, wherein the first and second nets thus formed are laminated and integrated in a state in which the wide webs cross each other. 5. The conductive mesh according to claim 1, wherein the mesh is woven with flat yarn as warp and weft, and a plurality of through holes are formed between the flat yarns.

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