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A directional electrostatic dissipating fabric and method of making such fabric constructed of a woven or knitted base fabric having an integrally woven or knitted grid structure which is raised above only one surface of the base fabric forming a fabric with a raised grid on one side and a smooth or

A directional electrostatic dissipating fabric and method of making such fabric constructed of a woven or knitted base fabric having an integrally woven or knitted grid structure which is raised above only one surface of the base fabric forming a fabric with a raised grid on one side and a smooth or substantially smooth grid on the other side thereby resulting in increased, directional electrostatic dissipation performance from the side having the raised grid. The grid is formed from an electroconductive yarn plied to a carrier yarn which is then integrally woven or knitted into the fabric in the warp direction, the fill direction or both, thereby producing a fabric which exhibits the rapid, yet controlled, directional dissipation of static electricity into the air. Such fabric can be used for anti-static covering cloths, filtration media and the like; but is particularly adapted for use in anti-static garments and it is particularly comfortable when the smooth or substantially smooth surface is adjacent the wearer and the raised surface is on the outside of the garment.

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1. An improved static dissipating fabric comprising a base fabric constructed of base fabric yarn having a front surface and a back surface, a first plurality of electroconductive yarns constructed into said base fabric extending from said front surface to said back surface of said base fabric and e

1. An improved static dissipating fabric comprising a base fabric constructed of base fabric yarn having a front surface and a back surface, a first plurality of electroconductive yarns constructed into said base fabric extending from said front surface to said back surface of said base fabric and extending substantially beyond the plane of said back surface in a substantially mutually parallel orientation to each other thereby forming a raised substantially parallel grid on said back surface of said base fabric and a smooth or substantially smooth grid on said front surface. 2. The improved fabric of claim 1 further including a second plurality of raised electroconductive yarns constructed into said base fabric in a direction substantially perpendicular to said first plurality of raised electroconductive yarns and extending from said front surface to said back surface of said base fabric and extending substantially beyond the plane of said back surface forming a raised substantially rectangular grid with said first and said second pluralities of raised electroconductive yarns on said back surface of said base fabric and a smooth or substantially smooth grid on said front surface. 3. The improved fabric of claim 1 wherein said first plurality of raised electroconductive yarns comprise a combination of electroconductive carbon doped multi-filament yarns plied with non-conductive multi-filament yarns and a diameter of said first plurality of said plied electroconductive yarns is greater than a diameter of said base fabric yarns forming said base fabric. 4. The improved fabric of claim 2 wherein said first and said second pluralities of raised electroconductive yarns comprise combinations of electroconductive carbon doped filament yarns plied with non-conductive filament yarns and a diameter of said first and said second pluralities of raised electroconductive yarns are greater than a diameter of said base fabric yarns forming said base fabric. 5. An improved static dissipating fabric comprising a base fabric having a front and a back surface which is woven from warp and fill base fabric yarn in a 2/1 twill construction, a first plurality of electroconductive yarns integrally woven into said base fabric at spaced locations across said warp of said base fabric in place of said base fabric warp yarn, each of said electroconductive warp yarns in said plurality of warp yarns having a diameter greater than the diameter of said base fabric warp yarns, a second plurality of electroconductive yarns integrally woven into said base fabric at spaced locations along the fill of said base fabric in place of said base fabric fill yarn, a first plurality of raised grid lines formed from peaks of said electroconductive warp yarn in the warp direction extending from said back surface of said base fabric at said spaced locations along said warp direction of said base fabric and a second plurality of raised grid lines formed from double floats of said electroconductive fill yarn in the fill direction extending from said back surface of said base fabric whereby the back surface of said fabric has a raised substantially rectangular grid of electrostatic yarn and the front surface of said fabric is substantially smooth. 6. The fabric of claim 5 wherein said electroconductive fill yarns are further comprised of a pair of side-by-side electroconductive yarns knit together. 7. The fabric of claim 5 wherein said electroconductive warp and said electroconductive fill yarns are each comprised of a non-conductive yarn plied to a conductive yarn. 8. The fabric of claim 5 wherein said base fabric warp and fill yarns are comprised of non-conductive material. 9. The method of manufacturing the improved fabric of the present invention having a raised electroconductive grid on one side of the fabric and a smooth or substantially smooth grid on the other side of the fabric comprising the steps of: (a) weaving a fabric from base fabric yarn in a 2/1 twill construction; (b) substituting a plurality of electroconductive warp yarns having a diameter greater than the diameter of the base fabric yarn and a higher shrinkage rate than the shrinkage rate of said base fabric yarn in place of the base fabric warp yarn at spaced locations across the width of the fabric during the weaving operation; (c) substituting a plurality of electroconductive fill yarns in place of the base fabric fill yarns at spaced locations along the length of the fabric during the weaving operation wherein each said electroconductive fill yarn has a diameter greater than the diameter of the base fabric yarn and a shrinkage rate substantially the same as the shrinkage rate of said base fabric yarn (d) laundering the woven fabric; (e) drying the woven fabric and allowing the electroconductive warp yarn to shrink to a greater degree than the electroconductive fill yarn and the base fabric yarns forming a series of raised peaks on one side of said fabric in the warp direction and a series of raised floats on said one side of the said fabric in said fill direction. 10. The method according to claim 9 wherein said large diameter electroconductive fill yarn is formed from two smaller diameter electroconductive fill yarns woven together as a single yarn. 11. The method according to claim 9 wherein the base fabric yarn is a non-conductive multifilament yarn. 12. The method according to claim 10 wherein the base fabric yarn is non-conductive multifilament yarn. 13. The method of making the improved fabric of the present invention having a raised electroconductive grid on one side of the fabric and a smooth or substantially smooth grid on the other side of the fabric comprising the steps of: (a) weaving a fabric from base fabric warp and fill yarn in a 2/1 twill construction; (b) locating a plurality of electroconductive warp yarns in spaced relationship across the width of said base fabric with each electroconductive warp yarn having a diameter greater than a diameter of the base fabric warp yarn; (c) applying a preweaving tension to each base fabric warp yarn; (d) applying a lower preweaving tension to each of said electroconductive warp yarns than the preweaving tension on said base fabric warp yarns; (e) locating a plurality of electroconductive fill yarns at spaced locations along the length of the fabric wherein the diameter of said electroconductive fill yarns is greater than the diameter of the base fabric fill yarn; (f) laundering the fabric; (g) drying the woven fabric and allowing the electroconductive warp yarn to form a series of raised peaks on one side of said fabric in the warp direction and a series of raised floats on said side of the fabric in the fill direction. 14. The method according to claim 13 wherein each said large diameter electroconductive fill yarn is formed from two smaller diameter electroconductive fill yarns woven together as a single yarn. 15. The method according to claim 13 wherein the yarn comprising the base fabric is a non-conductive multifilament yarn. 16. The method according to claim 14 wherein the yarn comprising the base fabric is a non-conductive multifilament yarn. 17. The method according to claim 13 further including the step of plying a multifilament non-conductive yarn to an electroconductive carbon doped conjugated yarn to produce a plied electroconductive yarn having a diameter greater than the diameter of the base fabric yarn. 18. The improved static dissipating fabric made in accordance with the method of claim 9. 19. The improved static dissipating fabric made in accordance with the method of claim 13.