Metal coated fiber materials
A flexible electrically conductive fabric is obtained by plating a fabric constructed of multifilament yarn composed of a plural flat thermoplastic singlefilaments.
1. An electrically conductive material comprising woven fabric constructed of multifilament yarn composed of a plurality of flat thermoplastic single filament and a metal coating layer formed on the surface of the fabric,
said flat single filament having an average flat ratio of 1.5 to 5.0 and having W-shaped, ellipse, rectangle or hourglass cross-section,
said multifilament yarn having an average flat ratio of 1.2 to 7.0,
said material having an EMI shielding performance of at least 70 dB in the range of 1 GHz to 15 GHz, and
the warp of said woven fabric has a fabric surface occupancy ratio of 60 to 90% and its weft has a fabric surface occupancy ratio of 90 to 120%.
2. The electrically conductive material as claimed in claim 1 , wherein said woven fabric has a cover factor of 1000 to 3000.
3. The electrically conductive material as claimed in claim 1 , wherein the thermoplastic fiber constituting said woven fabric is polyester fiber.
4. A method of producing an electrically conductive material which comprises providing a woven fabric constructed of multifilament yarn composed of a plurality of flat thermoplastic single filament and subjecting the fabric to a metal coating treatment by electroless plating,
said flat single filament having an average flat ratio of 1.5 to 5.0 and having W-shaped, ellipse, rectangle or hourglass cross-section,
said multifilament yarn having an average flat ratio of 1.2 to 7.0,
said material having an EMI shielding performance of at least 70 dB in the range of 1 GHz to 15 GHz, and
the warp of said woven fabric has a fabric surface occupancy ratio of 60 to 90% and its weft has a fabric surface occupancy ratio of 90 to 120%.
5. The method as claimed in claim 4 , wherein said woven fabric has a cover factor of 1000 to 3000.
6. The method as claimed in claim 4 , wherein the thermoplastic fiber constituting said woven fabric is polyester fiber.
7. An EMI shield consisting essentially of the electrically conductive material as claimed in claim 1 .
8. The electricity conductive material as claimed in claim 1 , wherein the thermoplastic fiber constituting said woven fabric is polyamide fiber.
9. The electrically conductive material as claimed in claim 8 , wherein the polyamide fiber is selected from Nylon 6 or Nylon 66 fiber.
10. The electrically conductive material as claimed in claim 3 , wherein the polyester fiber is polyethylene terephthalate fiber.
11. The method as claimed in claim 6 , wherein the polyester fiber is polyethylene terephthalate fiber.
12. The electrically conductive material as claimed in claim 1 , wherein the warp of said woven fabric has a fabric surface occupancy ratio of greater than 60% but less than 90% and its weft has a fabric surface occupancy ratio of greater than 90% but less than 120%.
13. The method of claim 4 wherein the warp of said woven fabric has a fabric surface occupancy ratio of greater than 60% but less than 90% and its weft has a fabric surface occupant ratio of greater than 90% but less than 120%.