JP2010261138A - Electroconductive woven fabric with vapor-deposited aluminum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroconductive woven fabric as an inexpensive material which is used as antistatic partition members, electromagnetic wave-shielding materials and the like. <P>SOLUTION: The electroconductive woven fabric with vapor-deposited aluminum is obtained by treating the surface of a plain woven fabric in which intersectional spots of warp and weft yarns are jointly fixed, by aluminum vapor deposition treatment. By bringing the yarn to be a synthetic resin monofilament with a core-sheath structure, and selecting the melting point of a core-forming synthetic resin to be ≥10°C higher than that of a sheath-forming synthetic resin as a method for jointly fixing the intersectional spots of the warp and weft yarns, the plain woven fabric can be efficiently used in which after solely the sheath part of the monofilament is melted and cooled in a posttreatment step, the intersectional spots of the warp and weft yarns are jointly fixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fabric imparted with conductivity by an aluminum vapor deposition process.

  The conductive sheet is utilized as an antistatic partition material and further as an electromagnetic shielding material.

  In the case of a conductive sheet, generally, a conductive metal wire is bonded to a synthetic resin sheet, or a large amount of carbon black or conductive metal powder is mixed into a synthetic resin and formed into a sheet shape. Therefore, a high technique is required to give sufficient flexibility and strength as a sheet, and the manufacturing cost tends to be expensive.

  Some of them have tailored conductive metal wires with a small mesh, but they have the disadvantages of being heavy and difficult to handle and lacking flexibility.

  In the field of textiles, fibers made of resin kneaded with carbon black or conductive metal fibers are woven into anti-static properties, and the fabric itself is plated with copper or chrome to make an electromagnetic shield. However, both were expensive.

  The present invention provides a conductive fabric as an inexpensive material that can be used as an antistatic partition material or an electromagnetic shielding material.

  The present invention is a plain fabric woven in a lattice pattern with warps and wefts, and the conductive fabric obtained by subjecting the surface of the fabric where warp and weft crosses are joined and fixed by post-processing to aluminum deposition. It is intended to provide an aluminum-deposited fabric.

  In the aluminum vapor-deposited fabric of the present invention, the warp and weft of the plain fabric used are synthetic resin monofilaments having a core-sheath structure, and the melting temperature of the synthetic resin forming the core is 10 ° C. or more higher than the melting temperature of the synthetic resin forming the sheath. By selecting so that only the sheath portion of the monofilament is melted in the post-treatment step, the fabric may be subjected to aluminum vapor deposition treatment by cooling and joining and fixing the portion where the warp and the weft intersect.

  The conductive fabric of the present invention is a plain fabric woven in a lattice pattern with warps and wefts, and obtained by subjecting the surface of the fabric where warp and weft crosses are joined and fixed by post-processing to aluminum deposition. It is done. In addition, the woven fabric in which the intersecting portion of the warp and the weft is bonded and fixed is a synthetic resin monofilament having a core-sheath structure, and is designed so that the melting temperature of the core is 10 ° C. or more higher than the melting temperature of the sheath. A plain woven fabric used as a weft is obtained by heating to a temperature at which only the sheath portion melts in a post-processing step and then cooling. Compared to conventional antistatic or electromagnetic shielding materials obtained by weaving expensive conductive fibers or plating copper or chrome on the fabric itself, it can be provided at a lower cost.

  The fabric imparted with conductivity by the aluminum vapor deposition of the present invention can be obtained by performing an aluminum vapor deposition treatment on the surface of the fabric where the portions where the warp and the weft intersect are fixed by post-processing. Conductivity is imparted by forming a continuous aluminum thin film on the yarn surface of the fabric.

  In the case of a woven fabric in which the portion where the warp and weft intersect is not fixed, the yarn moves at the portion where the warp and weft intersect with the force applied to the fabric after the aluminum vapor deposition, and is formed by aluminum vapor deposition The continuity of the aluminum thin film thus formed is impaired, and sufficient electrical conductivity cannot be imparted and maintained.

  The warp and weft used in the woven fabric may be either multifilaments such as twisted yarns or monofilaments, but the continuity of the aluminum thin film formed on the yarn surface by aluminum vapor deposition is maintained, and the part where the warp and weft intersect is post-processed Therefore, monofilament is preferred because of its ease.

  The method of joining and fixing the crossing part of the monofilament warp and weft is selected so that the monofilament has a core-sheath structure and the melting temperature of the synthetic resin forming the core is 10 ° C. higher than the melting temperature of the synthetic resin forming the sheath Thus, after melting only the sheath portion of the monofilament in the post-processing step, it is possible to use a method of cooling and joining and fixing the portion where the warp and the weft intersect.

  The synthetic resin for forming the monofilament may be any synthetic resin used as a synthetic fiber material, such as nylon, polyester, polyolefin, acrylic, and polyurethane. The selection of the synthetic resin that forms the core of the monofilament and the synthetic resin that forms the sheath satisfies the condition that the difference in melting temperature is 10 ° C or more, and if there is no problem in the molding process, the synthetic resin used as the synthetic fiber material Any combination of resins may be used, and the resin is not limited to the same system.

  The size of the mesh of the plain fabric on which aluminum is deposited is not limited at all, and can be freely set according to the purpose of use.

  Aluminum vapor deposition is carried out by installing a cooling drum on a crucible containing molten aluminum in a vacuum chamber and bringing it into contact with the cooling drum through a plain fabric. Accordingly, in a single aluminum vapor deposition process, an aluminum thin film is not formed on the portion of the plain fabric in contact with the cooling drum, but a continuous aluminum thin film is formed on one side. If necessary, an aluminum thin film can be formed on the entire woven fabric by performing aluminum vapor deposition treatment on the front and back of the plain woven fabric once.

  The thickness of the aluminum thin film formed by the aluminum vapor deposition process can be freely set according to the purpose of use.

  A polyethylene terephthalate resin obtained by condensation polymerization of terephthalic acid and ethylene glycol is used as the core resin. The melting temperature of this resin is 255 ° C. As the resin forming the sheath, 5 mol. % Polyester resin obtained by condensation polymerization of terephthalic acid and ethylene glycol. The melting temperature measured with a differential scanning calorimeter had a broad peak centered around 180 ° C. A plain woven fabric having a width of 150 cm and a length of 300 m was made of 100 mesh using a 28 dT monofilament having a core / sheath structure using these two types of resin as warps and wefts. This plain woven fabric was heat-set at 180 ° C. in the scouring process, and only the sheath portion was melted and then cooled, and the portion where the warp and weft intersect was joined and fixed. Aluminum vapor deposition was performed on the surface of this plain fabric to form an aluminum thin film of about 500 mm. The plain fabric is wound up through a vacuum deposition chamber in an aluminum deposition process. The plain fabric original fabric deposited with aluminum thus obtained was slit into a width of 200 mm and wound up. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

  Polypropylene resin is used as the core resin. The melting temperature of this resin is 164 ° C. As the resin forming the sheath, a copolymerized polypropylene resin obtained by polymerizing propylene containing ethylene was used. The melting temperature of this resin is 141 ° C. A plain woven fabric having a width of 150 cm and a length of 300 m was made of 100 mesh using a 25 dT monofilament having a core / sheath structure using these two types of resin as warps and wefts. This plain woven fabric was heat-set at 145 ° C. in the scouring process, only the sheath portion was melted, and the portion where the warp and weft intersect was joined and fixed. Aluminum vapor deposition was performed on the surface of this plain fabric to form an aluminum thin film of about 450 mm. The plain fabric is wound up through a vacuum deposition chamber in an aluminum deposition process. The aluminum-deposited plain fabric original fabric having a width of 150 cm thus obtained was slit and wound up to a width of 200 mm. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

  A polyethylene terephthalate resin obtained by condensation polymerization of terephthalic acid and ethylene glycol is used as the core resin. The melting temperature of this resin is 255 ° C. Nylon 6 resin was used as the resin forming the sheath. The melting temperature of this resin is 220 ° C. A plain woven fabric having a width of 150 cm and a length of 300 m was prepared using 90 mesh warps and wefts of a 30 dT monofilament having a core / sheath structure using these two types of resins. This plain woven fabric was heat-set at 225 ° C. in the scouring process, only the sheath portion was melted, and the portion where the warp and weft intersect was joined and fixed. Aluminum vapor deposition was performed on the surface of this plain fabric to form an aluminum thin film of about 550 mm. The plain fabric is wound up through a vacuum deposition chamber in an aluminum deposition process. The aluminum vapor deposited plain fabric original fabric having a width of 150 cm thus obtained was slit into 200 mm and wound up. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

Comparative Example 1

  A plain woven fabric having a width of 150 cm and a length of 300 m is made of 100 mesh using the same monofilament as that used in Example 1 as warps and wefts, and this plain woven fabric is not subjected to heat setting at 180 ° C. in the refining process. As it was, aluminum was evaporated on the surface to form an aluminum thin film of about 500 mm. The plain fabric is wound up through a vacuum deposition chamber in an aluminum deposition process. The aluminum-deposited plain fabric original fabric having a width of 150 cm thus obtained was slit and wound up to a width of 200 mm. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

Comparative Example 2

  A plain woven fabric having a width of 150 cm and a length of 300 m is made of 100 mesh using the same monofilament as that used in Example 2 as warp and weft, and this plain woven fabric is not subjected to heat setting at 145 ° C. in the refining process. As it was, aluminum was evaporated on the surface to form an aluminum thin film of about 450 mm. The aluminum-deposited plain fabric original fabric having a width of 150 cm thus obtained was slit and wound up to a width of 200 mm. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

Comparative Example 3

A plain woven fabric having a width of 150 cm and a length of 300 m is made of 100 mesh using the same monofilament as that used in Example 3 as warp and weft, and this plain woven fabric is not subjected to heat setting treatment at 225 ° C. As it was, aluminum deposition was performed on the surface to form an aluminum thin film of about 550 mm. The aluminum-deposited plain fabric original fabric having a width of 150 cm thus obtained was slit and wound up to a width of 200 mm. This 200 mm wide roll was unwound by hand, and a length of 10 m was cut out as a measurement sample. A tester was applied to the aluminum-deposited side of this sample to confirm the presence or absence of conductivity. In addition, the sample was brought close to a mixture of finely cut tobacco ash, cotton, wool, and polyester fibers, and the occurrence of static electricity was confirmed by the presence or absence of adhesion to the fabric. The results are shown in Table 1. It was shown to.

  A conductive fabric obtained by depositing aluminum on a plain fabric woven using synthetic fibers is not charged due to generation of static electricity, and is expected to be used in a field where an antistatic film is required. Since it has a mesh structure rather than a so-called film, it can be used as an antistatic film through which air flows. In addition, the conductive fabric deposited with aluminum has electromagnetic shielding performance and is expected to be used as an electromagnetic shielding film. For example, it is possible to create an apron or clothing for electromagnetic wave shielding by sewing with a normal cloth.

Claims (2)

  An aluminum-deposited conductive fabric obtained by performing aluminum deposition on the surface of a fabric that is a plain fabric woven in a lattice pattern with warps and wefts.   The plain fabric warp and weft are synthetic resin monofilaments having a core / sheath structure, and the melting temperature of the synthetic resin forming the core is higher than the melting temperature of the synthetic resin forming the sheath by 10 ° C. or more in the post-treatment process. The aluminum-deposited conductive fabric according to claim 1, wherein only the sheath portion is melted and then cooled and the portion where warp and weft intersect is joined and fixed.