초록

A positive variable resistive yarn having a core, a sheath, and an insulator. The sheath includes distinct electrical conductors intermixed within a thermal expansive low conductive matrix. As the temperature of the yarn increases, the resistance of the sheath increases.

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1. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix materia

1. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises ethylene ethylacrylate. 2. The electrically conductive yarn according to claim 1, wherein the low conductive matrix further includes polyethylene.3. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises polyethylene. 4. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible-non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises a polyolefin. 5. An electrically conductive yarn having a temperature dependent resistance, said yam comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises a halo-derivative of polyethylene. 6. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises a thermoplastic. 7. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises a thermosetting material. 8. An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and wherein the low conductive matrix comprises a cross-linked material.