WO2005033387A2 - Wrapped conductive yarn - Google Patents

Wrapped conductive yarn Download PDF

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Publication number
WO2005033387A2
WO2005033387A2 PCT/US2004/029179 US2004029179W WO2005033387A2 WO 2005033387 A2 WO2005033387 A2 WO 2005033387A2 US 2004029179 W US2004029179 W US 2004029179W WO 2005033387 A2 WO2005033387 A2 WO 2005033387A2
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WO
WIPO (PCT)
Prior art keywords
conductive
strand
semiconductive
center
semi
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Application number
PCT/US2004/029179
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French (fr)
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WO2005033387A3 (en
Inventor
Andrew D. Child
Original Assignee
Milliken & Company
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Publication date
Application filed by Milliken & Company filed Critical Milliken & Company
Publication of WO2005033387A2 publication Critical patent/WO2005033387A2/en
Publication of WO2005033387A3 publication Critical patent/WO2005033387A3/en

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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/12—Threads containing metallic filaments or strips
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn

Definitions

  • the present invention generally relates to textile yarns, and in particular, to conductive textile yarns.
  • Yarns which are filament of non-conductive material that have been wrapped with steel filament are known in the art. Examples of such yarns are disclosed in US Patent Number 5,927,060, titled “Electrically Conductive Yarn” and issued to Watson on July 27, 1999, and US Patent Number 5,881 ,547, titled “Conducting Yarn” and issued to Chiou et al. on March 16, 1999.
  • yarns which are filament of non- conductive material that have been silver coated are known.
  • yarns are known which are filament of non-conductive material that has been silver coated and then wrapped with steel filament are known.
  • Yarns which are filament of non-conductive material that have been wrapped with steel filament have good wash durability but poor electrical contact connection. Wash durability, as used herein, shall mean the ability of the yarn to retain its initial level of conductivity after multiple home launderings.
  • Electrical contact connection shall mean the electrical conductivity between two adjacent yarns which are engaging each other for electrical connection. Yarns which are filaments of non-conductive material that have been coated with silver, have good electrical contact connection, but poor wash durability. Yarns which are filaments of non- conductive material which have been coated with silver and then wrapped with steel filament, have good electrical connection contact, but can be too conductive for many applications. The silver coated nonconductive filaments will degrade during activities such as home laundering, leading to significant conductivity loss for the yarn.
  • the present invention provides a conductive yarn with good electrical condition conductivity, good wash durability, and a desirable conductive range.
  • FIG. 1 is an enlarged view of a section from and indefinite length of a conductive yarn according to the present invention
  • FIG. 2 is an enlarged cross-section of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive monofilament and the conductive wrap strands are monofilament
  • FIG. 3 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive core/sheath monofilament and the conductive wrap strands are monofilament
  • FIG. 1 is an enlarged view of a section from and indefinite length of a conductive yarn according to the present invention
  • FIG. 2 is an enlarged cross-section of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive monofilament and the conductive wrap strands are monofilament
  • FIG. 3 is an enlarged cross-sectional view of an embodiment of the conductive yarn in
  • FIG. 4 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is semi-conductive multifilament and the conductive wrap strands are monofilament;
  • Figure 5 is an enlarged cross-sectional view of an embodiment of the conductive yarn from FIG. 1 , wherein the center strand is a multifilament strand containing semi-conductive core/sheath filaments and the conductive wrap strands are monofilament;
  • FIG. 6 is an enlarged cross-sectional view of an embodiment of the conductive yarn from FIG. 1 , wherein the center strand is a semi-conductive strand of staple fibers and the conductive wrap strands are monofilaments; and, FIG.
  • FIG. 7 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive strand of staple fibers and the conductive wrap strands are monofilament, and wherein the staple fibers of center strand include semi-conductive core/sheath fibers.
  • a yarn shall mean a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric.
  • a strand shall mean continuous slender elongated body having a high ratio of length to cross-sectional distance, such as cords, wires, tapes, threads, yarns, or the like.
  • non-conductive material shall mean a material that has a resistivity sufficient such that the conductivity of an adjacent conductive material or item in contact with the non-conductive material will not be materially affected by the nonconductive material or item. Referring now to FIG.
  • the conductive yarn 100 includes a semi- conductive center strand 110 and a conductive wrap 120.
  • the semi-conductive center strand 110 extends longitudinally along the yarn 100.
  • the semi-conductive center strand has a longitudinal resistance of no more than about 1 x 10 13 ohms per inch.
  • the semi-conductive center strand 110 has a longitudinal resistance of no more than about 2.5 X 10 10 .
  • the semi-conductive center strand 110 has a longitudinal resistance of no more than about 1 X 10 9 ohms per inch.
  • the conductive wrap 120 of the conductive yarn 100 is wrapped around the semi-conductive center strand 110, and extends longitudinally along the semi- conductive center strand 110.
  • the conductive wrap 120 is in electrical contact with the semi-conductive center strand 110 longitudinally along the semi-conductive center strand 110.
  • the conductive wrap 120 has a resistance which is longitudinal to the yarn of no more than about one-tenth of the semi-conductive center strand 110.
  • the conductive wrap 120 includes first and second conductive wrap strands 121 and 121.
  • the first conductive wrap strand 121 is wrapped around the semi-conductive center strand 121 in a Z direction
  • the second conductive strand 122 is wrapped around the semi-conductive center strand 110 in a S direction.
  • the semi-conductive center strand 110 comprises a monofilament 111 of semi- conductive material, such as a polymer with conductive particles dispensed therein, conductive polymers, strands of conductive polymers, or ??? polymers.
  • the first conductive wrap strand 121 and the second wrap strand 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as steel, copper, silver, tin, nickel or other metals, metal coated strands and the like.
  • FIG. 3 there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1. As illustrated in FIG.
  • the semi-conductive center strand 110 comprises a semi-conductive core/sheath monofilament 112.
  • the semi-conductive core/sheath monofilament 112 of the semi- conductive center strand 110 has a core portion 112a and a sheath portion 112b.
  • the core 112a is a non-conductive material and the sheath 112b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties.
  • the semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite, or other metal oxide coatings, or conductive particles desired in a matrix, metalliz coating such as silver, gold, tin, and nickel.
  • the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2.
  • FIG. 4 there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1.
  • the semi-conductive center strand 110 comprises a multifilament strand having semi- conductive filaments 113.
  • the semi-conductive filaments 113 are formed of a semi- conductive material, such as a polymer with conductive particles dispensed therein, conductive polymers, strands of conductive polymers, or pyrolized polymers.
  • the semi-conductive center strand 110 can also include non-conductive filaments 118.
  • the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2.
  • FIG. 5 there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1.
  • the semi-conductive center strand 110 comprises a multifilament strand having semi- conductive core/sheath filaments 114.
  • the semi-conductive core/sheath filaments 114 have a core portion 114a and a sheath portion 114b.
  • the core portion 114a is a non-conductive material
  • the sheath portion 114b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties.
  • the semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite, or other metal oxide coatings, or conductive particles desired in a matrix, metalliz coating such as silver, gold, tin, and nickel.
  • the semi-conductive center strand 110 can also include non- conductive filaments 118.
  • the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to FIG.
  • the center semi-conductive strand 110 comprises conductive fibers 115.
  • the conductive fibers can be formed of materials such as steel, copper, silver, tin, nickel or other metals, metal coated strands and the like.
  • the semi-conductive fibers 115 are typically staple fibers twisted together to formed the semi-conductive center strand 110.
  • the semi- conductive center strand 110 can also include non-conductive fibers 119, which can be staple fibers of a non-conductive material. Examples of a non-conductive material for the non-conductive fibers include materials such as pet, cotton, nylon ceramics, acrylic, wool, and other textile fibers.
  • the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to FIG. 7, there is shown an enlarged cross-sectional view of another embodiment of the conducive yarn 100 from FIG. 1. As illustrated in FIG.
  • the semi-conductive center strand 110 comprises semi-conductive core/sheath fibers 116, having a core portion 116a and a sheath portion 116b.
  • the core portion 116a is a non-conductive material
  • the sheath portion 116b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties.
  • the semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite or other metal oxide coatings, or conductive particles dispersed in a matrix, metalliz coating such as silver, gold, tin and nickel.
  • the semi-conductive core/sheath fibers 116 are typically staple fibers twisted together to formed the semi-conductive center strand 110.
  • the semi-conductive center strand 110 can also include non-conductive fibers 119, which can be staple fibers of a non-conductive material.
  • non-conductive material for the non-conductive fibers include materials such as pet, cotton, nylon ceramics, acrylic, wool, and other textile fibers.
  • the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. As illustrated in FIGS. 1-7, the conductivity along the length of the conductive yarn 100 is primarily provided by the conductive wrap 120.
  • the semi-conductive center strand 110 provides some conductivity along the length of the conductive yarn 100, but not an appreciable amount.
  • the semi-conductive center strand 110 does not provide and appreciable amount of conductivity along the length of the conductive yarn 100, erosion of the semi-conductive core 110, or degradation of the conductivity of the semi-conductive core 110, will not appreciably change the longitudinal conductivity of the conductive yarn 100. Electrical contact connection of the conductive yarn 100 is improved by the semi-conductive center strand 110 providing a greater surface area for electrical contact. Because of the short distance between the conductive strands 112a and 112b of the conductive wrap 120, the semi-conductive nature of the center strand 110 does not significantly effect the connection or the longitudinal conductivity of the yarn 100. Also, in the area of connection, the connecting item protects the center semi-conductive strand 11 from erosion or degradation, thereby maintaining the electrical connection with the conductive wrap 12.
  • FIG 8 there is shown a figure illustrating the change in resistively with core degradation between the yarn of the present invention and the prior art yarn having a conductive core with a conductive wrap.
  • the inventive yarn has a core that is 25 times more resistive than the wrapper.
  • the prior art yarn has a core and wrapper with the same conductivity.
  • the inventive yarn will show a maximum of 4% loss in conductivity after multiple launderings, whereas, the prior art yarn will have up to a 50% decrease in conductivity after laundering.
  • a 100 denier copper sulfite coated filament yarn sold by Tex-Stat, in Atlanta, GA., under the name Thunderon® was used as the center semi-conduction strand, and two stainless steel filaments of 35 micron diameter wire were used as the first and second strands of the conductive wrap.
  • the longitudinal resistance of the semi-conductive center strand was about 4000 ohms per inch.
  • the stainless steel filament wrap strands had a longitudinal resistance of about 10 ohms per inch.
  • the two stainless steel filaments were wrapped in opposite Z and S direction around the copper sulfite coated filament yarn with about 8 wraps per inch.

Abstract

A yarn is disclosed with a center semiconductive strand and an outer conductive wrap strand.

Description

WRAPPED CONDUCTIVE YARN
BACKGROUND The present invention generally relates to textile yarns, and in particular, to conductive textile yarns. Yarns which are filament of non-conductive material that have been wrapped with steel filament are known in the art. Examples of such yarns are disclosed in US Patent Number 5,927,060, titled "Electrically Conductive Yarn" and issued to Watson on July 27, 1999, and US Patent Number 5,881 ,547, titled "Conducting Yarn" and issued to Chiou et al. on March 16, 1999. Also, yarns which are filament of non- conductive material that have been silver coated are known. Additionally, yarns are known which are filament of non-conductive material that has been silver coated and then wrapped with steel filament are known. Yarns which are filament of non-conductive material that have been wrapped with steel filament, have good wash durability but poor electrical contact connection. Wash durability, as used herein, shall mean the ability of the yarn to retain its initial level of conductivity after multiple home launderings. Electrical contact connection, as used herein, shall mean the electrical conductivity between two adjacent yarns which are engaging each other for electrical connection. Yarns which are filaments of non-conductive material that have been coated with silver, have good electrical contact connection, but poor wash durability. Yarns which are filaments of non- conductive material which have been coated with silver and then wrapped with steel filament, have good electrical connection contact, but can be too conductive for many applications. The silver coated nonconductive filaments will degrade during activities such as home laundering, leading to significant conductivity loss for the yarn. The present invention provides a conductive yarn with good electrical condition conductivity, good wash durability, and a desirable conductive range.
BRIEF DESCRIPTION OF THE DRAWINGS The invention can be better understood with reference to the drawings, where: FIG. 1 is an enlarged view of a section from and indefinite length of a conductive yarn according to the present invention; FIG. 2 is an enlarged cross-section of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive monofilament and the conductive wrap strands are monofilament; FIG. 3 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive core/sheath monofilament and the conductive wrap strands are monofilament; FIG. 4 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is semi-conductive multifilament and the conductive wrap strands are monofilament; Figure 5 is an enlarged cross-sectional view of an embodiment of the conductive yarn from FIG. 1 , wherein the center strand is a multifilament strand containing semi-conductive core/sheath filaments and the conductive wrap strands are monofilament; FIG. 6 is an enlarged cross-sectional view of an embodiment of the conductive yarn from FIG. 1 , wherein the center strand is a semi-conductive strand of staple fibers and the conductive wrap strands are monofilaments; and, FIG. 7 is an enlarged cross-sectional view of an embodiment of the conductive yarn in FIG. 1 , wherein the center strand is a semi-conductive strand of staple fibers and the conductive wrap strands are monofilament, and wherein the staple fibers of center strand include semi-conductive core/sheath fibers.
DETAILED DESCRIPTION A yarn, as used in this description, shall mean a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric. A strand, as used in this description, shall mean continuous slender elongated body having a high ratio of length to cross-sectional distance, such as cords, wires, tapes, threads, yarns, or the like. Also as used in this description, non-conductive material shall mean a material that has a resistivity sufficient such that the conductivity of an adjacent conductive material or item in contact with the non-conductive material will not be materially affected by the nonconductive material or item. Referring now to FIG. 1 , there is shown a conductive yarn 100 illustrating the present invention. As illustrated, the conductive yarn 100 includes a semi- conductive center strand 110 and a conductive wrap 120. The semi-conductive center strand 110 extends longitudinally along the yarn 100. In one embodiment, the semi-conductive center strand has a longitudinal resistance of no more than about 1 x 1013 ohms per inch. In another embodiment, the semi-conductive center strand 110 has a longitudinal resistance of no more than about 2.5 X 1010. In one embodiment, the semi-conductive center strand 110 has a longitudinal resistance of no more than about 1 X 109 ohms per inch. The conductive wrap 120 of the conductive yarn 100 is wrapped around the semi-conductive center strand 110, and extends longitudinally along the semi- conductive center strand 110. The conductive wrap 120 is in electrical contact with the semi-conductive center strand 110 longitudinally along the semi-conductive center strand 110. The conductive wrap 120 has a resistance which is longitudinal to the yarn of no more than about one-tenth of the semi-conductive center strand 110. As illustrated, the conductive wrap 120 includes first and second conductive wrap strands 121 and 121. The first conductive wrap strand 121 is wrapped around the semi-conductive center strand 121 in a Z direction, and the second conductive strand 122 is wrapped around the semi-conductive center strand 110 in a S direction. Referring now to FIG. 2, there is shown an enlarged cross-sectional view of one embodiment of the conductive yarn 100 in FIG. 1. As illustrated in FIG. 2, the semi-conductive center strand 110 comprises a monofilament 111 of semi- conductive material, such as a polymer with conductive particles dispensed therein, conductive polymers, strands of conductive polymers, or ??? polymers. The first conductive wrap strand 121 and the second wrap strand 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as steel, copper, silver, tin, nickel or other metals, metal coated strands and the like. Referring now to FIG. 3, there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1. As illustrated in FIG. 3, the semi-conductive center strand 110 comprises a semi-conductive core/sheath monofilament 112. The semi-conductive core/sheath monofilament 112 of the semi- conductive center strand 110 has a core portion 112a and a sheath portion 112b. In one embodiment, the core 112a is a non-conductive material and the sheath 112b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties. The semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite, or other metal oxide coatings, or conductive particles desired in a matrix, metalliz coating such as silver, gold, tin, and nickel. Also as illustrated, the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to Figure 4, there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1. As illustrated in FIG. 4, the semi-conductive center strand 110 comprises a multifilament strand having semi- conductive filaments 113. The semi-conductive filaments 113 are formed of a semi- conductive material, such as a polymer with conductive particles dispensed therein, conductive polymers, strands of conductive polymers, or pyrolized polymers. In this embodiment, the semi-conductive center strand 110 can also include non-conductive filaments 118. Also as illustrated, the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to FIG. 5, there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 in FIG. 1. As illustrated in FIG. 5, the semi-conductive center strand 110 comprises a multifilament strand having semi- conductive core/sheath filaments 114. The semi-conductive core/sheath filaments 114 have a core portion 114a and a sheath portion 114b. In one embodiment, the core portion 114a is a non-conductive material, and the sheath portion 114b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties. The semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite, or other metal oxide coatings, or conductive particles desired in a matrix, metalliz coating such as silver, gold, tin, and nickel. In this embodiment, the semi-conductive center strand 110 can also include non- conductive filaments 118. Also as illustrated, the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to FIG. 6, there is shown an enlarged cross-sectional view of another embodiment of the conductive yarn 100 from FIG. 1. As illustrated in FIG. 6, the center semi-conductive strand 110 comprises conductive fibers 115. The conductive fibers can be formed of materials such as steel, copper, silver, tin, nickel or other metals, metal coated strands and the like. A polymer, matrix with conductive particles dispersed therein, conductive polymers, strands of conductive polymers, or ??polymers. Conductive polymer, cooper sulfite, or other metal oxide coatings or conductive particles dispersed in a matrix, metalliz coating such as silver, gold, tin, and nickel. The semi-conductive fibers 115 are typically staple fibers twisted together to formed the semi-conductive center strand 110. The semi- conductive center strand 110 can also include non-conductive fibers 119, which can be staple fibers of a non-conductive material. Examples of a non-conductive material for the non-conductive fibers include materials such as pet, cotton, nylon ceramics, acrylic, wool, and other textile fibers. Also as illustrated, the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. Referring now to FIG. 7, there is shown an enlarged cross-sectional view of another embodiment of the conducive yarn 100 from FIG. 1. As illustrated in FIG. 7, the semi-conductive center strand 110 comprises semi-conductive core/sheath fibers 116, having a core portion 116a and a sheath portion 116b. In one embodiment, the core portion 116a is a non-conductive material, and the sheath portion 116b is a semi-conductive material providing the semi-conductive center strand 110 with the semi-conductive properties. The semi-conductive material of the sheath 112a can be conductive polymer, copper sulfite or other metal oxide coatings, or conductive particles dispersed in a matrix, metalliz coating such as silver, gold, tin and nickel. The semi-conductive core/sheath fibers 116 are typically staple fibers twisted together to formed the semi-conductive center strand 110. The semi-conductive center strand 110 can also include non-conductive fibers 119, which can be staple fibers of a non-conductive material. Examples of a non-conductive material for the non-conductive fibers include materials such as pet, cotton, nylon ceramics, acrylic, wool, and other textile fibers. Also as illustrated, the first and second conductive wrap strands 121 and 122 of the conductive wrap 120 comprise monofilaments of a conductive material, such as discussed above with reference to FIG. 2. As illustrated in FIGS. 1-7, the conductivity along the length of the conductive yarn 100 is primarily provided by the conductive wrap 120. The semi-conductive center strand 110 provides some conductivity along the length of the conductive yarn 100, but not an appreciable amount. Because the semi-conductive center strand 110 does not provide and appreciable amount of conductivity along the length of the conductive yarn 100, erosion of the semi-conductive core 110, or degradation of the conductivity of the semi-conductive core 110, will not appreciably change the longitudinal conductivity of the conductive yarn 100. Electrical contact connection of the conductive yarn 100 is improved by the semi-conductive center strand 110 providing a greater surface area for electrical contact. Because of the short distance between the conductive strands 112a and 112b of the conductive wrap 120, the semi-conductive nature of the center strand 110 does not significantly effect the connection or the longitudinal conductivity of the yarn 100. Also, in the area of connection, the connecting item protects the center semi-conductive strand 11 from erosion or degradation, thereby maintaining the electrical connection with the conductive wrap 12. Referring now to Figure 8, there is shown a figure illustrating the change in resistively with core degradation between the yarn of the present invention and the prior art yarn having a conductive core with a conductive wrap. In this example, the inventive yarn has a core that is 25 times more resistive than the wrapper. The prior art yarn has a core and wrapper with the same conductivity. The inventive yarn will show a maximum of 4% loss in conductivity after multiple launderings, whereas, the prior art yarn will have up to a 50% decrease in conductivity after laundering. In one example of the present invention, a 100 denier copper sulfite coated filament yarn sold by Tex-Stat, in Atlanta, GA., under the name Thunderon® was used as the center semi-conduction strand, and two stainless steel filaments of 35 micron diameter wire were used as the first and second strands of the conductive wrap. The longitudinal resistance of the semi-conductive center strand was about 4000 ohms per inch. The stainless steel filament wrap strands had a longitudinal resistance of about 10 ohms per inch. The two stainless steel filaments were wrapped in opposite Z and S direction around the copper sulfite coated filament yarn with about 8 wraps per inch.

Claims

1. A yarn comprising: a center semiconductive strand extending longitudinally along the yarn and having a longitudinal resistance of no more than about 1 X 1013 ohms per inch along the center semiconductive strand; a conductive wrap being in electrical contact with the center semiconductive strand longitudinally along the center semiconductive strand and having a resistance of no more than about one-tenth (1/10) of the resistance of the center semiconductive strand.
2. The yarn according to Claim 1 , wherein the center semiconductive strand further comprises a semiconductive filament.
3. The yarn according to Claim 2, wherein the semiconductive filament includes a core and a semiconductive sheath.
4. The yarn according to Claim 1 , wherein the center semiconductive strand includes a plurality of semiconductive filaments.
5. The yarn according to Claim 4, wherein the semiconductive filaments include a core and a semiconductive sheath.
6. The yarn according to Claim 1 , wherein the center semiconductive strand includes a plurality of semiconductive fibers.
7. The yarn according to Claim 6, wherein the semiconductive fibers include a core and a semiconductive sheath.
8. The yarn according to Claim 6, wherein the semiconductive fibers are staple fibers.
9. The yarn according to Claim 1 , wherein the center semiconductive strand includes a nonconductive filament.
10. The yarn according to Claim 2, wherein the center semiconductive strand includes a plurality of nonconductive filaments.
11. The yarn according to Claim 7, wherein the center semiconductive strand includes a plurality of nonconductive fibers.
12. The yarn according to Claim 11 , wherein the nonconductive fibers comprise staple fibers.
13. The yarn according to Claim 1 , wherein the conductive wrap includes a first conductive wrap strand and a second conductive wrap strand.
14. The yarn according to Claim 13, wherein the first conductive wrap strand is wrapped around the center semiconductive strand in a Z direction and the second conductive wrap strand is wrapped around the center semiconductive strand in a S direction.
15. The yarn according to Claim 13, wherein the first conductive strand and the second conductive strand each comprise a monofilament.
PCT/US2004/029179 2003-09-30 2004-09-08 Wrapped conductive yarn WO2005033387A2 (en)

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US10/675,017 2003-09-30

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