Cord-shaped heater, sheet-shaped heater and manufacturing method of sheet-shaped heater
A cord-shaped heater 1 , having: a conductive wires 5 a ; an inner-layer covering 7 formed on the outer periphery of the conductive wires 5 a ; and an outer-layer covering 9 formed on the outer periphery of the inner-layer covering 7 , wherein the melting temperature of the inner-layer covering 7 is higher than the melting temperature of the outer-layer covering 9 , the inner-layer covering 7 and the outer-layer covering 9 are made of same type of polymer material, and the inner-layer covering 7 and the outer-layer covering 9 are adhered to each other. The cord-shaped heater 1 , wherein the conductive wire 5 a includes a plurality of conductive wires, and the conductive wires 5 a is covered with an insulating film 5 b . A sheet-shaped heater, wherein the cord-shaped heater is arranged on a substrate, the substrate has a gap, at least a part of the outer-layer covering is penetrated into the gap of the substrate, and the inner-layer covering is not penetrated into the gap of the substrate.
1. A cord-shaped heater, comprising:
a conductive wire;
an inner-layer covering formed on the outer periphery of the conductive wire; and
an outer-layer covering formed on the outer periphery of the inner-layer covering, characterized in that
the melting temperature of the inner-layer covering is higher than the melting temperature of the outer-layer covering,
the inner-layer covering is selected from the group consisting of a polyester resin, a polyolefin-based thermoplastic elastomer, a polyester-based thermoplastic elastomer and a polyurethane-based thermoplastic elastomer,
the outer-layer covering is a same material as the inner-layer covering, and
the inner-layer covering and the outer-layer covering are adhered to each other.
2. The cord-shaped heater according to claim 1 , characterized in that
the conductive wire includes a plurality of conductive wires, and
the conductive wire is covered with an insulating film.
3. The cord-shaped heater according to claim 1 , characterized in that
the polymer material is the polyester-based thermoplastic elastomer.
4. The cord-shaped heater according to claim 1 , characterized in that
the melting temperature of the outer-layer covering is 100° C. to 225° C.,
a lower limit of the melting temperature of the inner-layer covering is higher by 30° C. or more than the melting temperature of the outer-layer covering, and
an upper limit of the melting temperature of the inner-layer covering is 300° C.
5. The cord-shaped heater according to claim 1 , characterized in that
the melting temperature of the outer-layer covering is 130° C. to 185° C., and
the melting temperature of the inner-layer covering is 215° C. to 250° C.
6. The cord-shaped heater according to claim 1 , characterized in that
a thickness of the inner-layer covering is 0.04 mm or more, and
an outer diameter of the cord-shaped heater is 0.73 mm or less.
7. A sheet-shaped heater, characterized in that
the cord-shaped heater according to claim 1 is arranged on a substrate.
8. The sheet-shaped heater according to claim 7 , characterized in that
the substrate has a gap,
at least a part of the outer-layer covering is penetrated into the gap of the substrate, and
the inner-layer covering is not penetrated into the gap of the substrate.
9. The sheet-shaped heater according to claim 8 , characterized in that
a cross-sectional shape of the inner-layer covering is kept in an approximately circular shape.
10. The sheet-shaped heater according to claim 7 , characterized in that
the polymer material is the polyester-based thermoplastic elastomer.
11. The sheet-shaped heater according to claim 7 , characterized in that
the melting temperature of the outer-layer covering is 100° C. to 225° C.,
a lower limit of the melting temperature of the inner-layer covering is higher by 30° C. or more than the melting temperature of the outer-layer covering, and
an upper limit of the melting temperature of the inner-layer covering is 300° C.
12. The sheet-shaped heater according to claim 7 , characterized in that
the melting temperature of the outer-layer covering is 130° C. to 185° C., and
the melting temperature of the inner-layer covering is 215° C. to 250° C.
13. The sheet-shaped heater according to claim 7 , characterized in that
a thickness of the inner-layer covering is 0.04 mm or more, and
an outer diameter of the cord-shaped heater is 0.73 mm or less.
14. A method of manufacturing sheet-shaped heater, the method comprising the steps of:
arranging a cord-shaped heater on a substrate having a gap, the cord-shaped heater including a conductive wire, an inner-layer covering formed on the outer periphery of the conductive wire, and an outer-layer covering formed on the outer periphery of the inner-layer covering, wherein the inner-layer covering is selected from the group consisting of a polyester resin, a polyolefin-based thermoplastic elastomer, a polyester-based thermoplastic elastomer and a polyurethane-based thermoplastic elastomer, and the outer-layer covering is a same material as the inner-layer covering; and
heat-fusing the cord-shaped heater and the substrate by melting the outer-layer covering by heat and pressure without substantially melting the inner-layer covering so that the outer-layer covering is penetrated into the gap of the substrate.