JPH0685362B2 - Terminal structure of heat sensitive wire - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of a heat-sensitive electric wire used for an electric warming tool such as an electric blanket, a blanket, and a knee rest.

2. Description of the Related Art Conventionally, electric warmers made of cloth, mainly electric blankets, have no problem with dirt, and there is a problem that even if the electric part is inside the main body of the electric blanket, it cannot even be washed with water. However, with respect to washing with water, washing with water becomes possible by taking measures to prevent corrosion of connection pins and tracking between terminals. However, large laundry such as a blanket is not easy to wash at home, and if it can be dry-cleaned by a trader, it is the most desirable electric warming tool.

Problems to be Solved by the Invention However, when a conventional electric blanket is dry-cleaned,
There were the following big problems.

(1) The electric insulation jacket of flexible heat-sensitive wire used as a heater or a temperature sensor is made of a plasticized polyvinyl chloride composition, and a plasticizer is applied with a dry cleaning solvent such as petroleum or perkylene (tetrachloroethylene). It elutes, loses its flexibility, and the thickness of the outer cover is greatly reduced.

(2) The electric characteristics of the polymer thermosensitive layer of the flexible thermosensitive 1-wire greatly fluctuates.

(3) There was a problem that the end treatment mold forming part of the flexible heat-sensitive electric wire was cracked or shrunk due to the elution of the plasticizer.

In such a problem, even if the heat-sensitive electric wire itself is provided with anti-dry cleaning measures, the dry cleaning solvent permeates from the end of the heat-sensitive electric wire and the solvent enters inside the polymer temperature-sensitive layer of the heat-sensitive electric wire, so that the electrical characteristics are improved. It changes a lot.

Means for Solving the Problems According to the present invention, a polymer temperature-sensitive layer is formed between at least one pair of electrodes, and an outer cover is provided on the outer side of them, and at least a part of the outer covers is dry-cleaned. The terminal connection part of the terminal of the heat-sensitive electric wire made of a solvent barrier resin was fitted into the outer molding which was insoluble in the dry cleaning solvent, and the outer molding was filled with potting resin which was insoluble in the solvent. It is a thing. As a cleaning agent in dry cleaning, trichloroethylene. Halogenated hydrocarbons such as tetrachloroethylene trichloroethane and petroleum are used.

Examples of potting resin materials used in the present invention for petroleum and halogenated hydrocarbons as cleaning agents include materials having excellent solvent resistance and non-affinity and having hydrogen bonds, materials having high bonds, and highly crystalline materials. Some have this property. Specifically, (1) fluoropolymers such as polyvinyl fluoride and polyvinylidene fluoride, (2) acrylonitrile copolymers such as NBR, (3) nylon 11,12
Such as polyamide, (4) ethylene-vinyl alcohol copolymer, vinyl alcohol copolymer such as ethylene-vinyl acetate copolymer partially saponified, (5) ionomer, ethylene maleic acid metal salt, etc. There are polymers such as metal chelate-containing polymers and (6) high crystallinity polyolefins such as high density polyethylene and polypropylene. These polymers or compositions containing these as base polymers are suitable as the polymer polymer material of the present invention.

Among these, those having properties as a hot melt adhesive are suitable, and as specific examples thereof, a polyamide adhesive and a carboxyl group-containing polyolefin are suitable.

With the above configuration, the terminal connection portion of the terminal electrode is protected from the dry cleaning solvent.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway front view of a heat-sensitive electric wire.

1 is a flexible core thread, 2 is an internal electrode spirally wound around the core thread 1,
Reference numeral 3 is a tubular polymer temperature-sensitive layer, 4 is an external electrode spirally wound around the polymer thermosensitive layer, and 5 is an outer coat made of a barrier resin layer against a dry cleaning solvent.

2a and 2b are terminal connection portions of electrodes of the terminal portion of the heat-sensitive electric wire, 6 is a connection terminal, 7 is a connection terminal, and 8 is an eyelet for biting the flexible core yarn 1 and the internal electrode 2 is there.

The terminal connection portion of the electrode of the terminal in FIGS.
It is set in the outer molded article 11 insoluble in the dry cleaning solvent shown in the figure. FIG. 4 shows a state in which the terminal connecting portion is set in the outer molded product 11. Then, in the state where the molded article 11 is set in this manner, the molten potting resin (insoluble in the dry cleaning solvent) 10 is poured from the upper surface of the molded article 11 to be filled and solidified. This filled state is shown in FIG.

As described above, by sealing the terminal connection portion of the terminal electrode outside with the potting resin in the molded product, it is possible to prevent the electrical characteristics of the polymer temperature-sensitive electric wire of the heat-sensitive wire from changing. is there.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a heat-sensitive wire, FIGS. 2a and 2b are a top view and a side view of a terminal portion of a conventional heat-sensitive wire, and FIGS. 3a to 3d are outside views of an embodiment of the present invention. The top view, the back view, the front view, the perspective view, and FIGS. 4a to 4c of the molded product are the top view and the side view in which the terminal connection portion of the end of the heat-sensitive electric wire is housed in the outer molded product of one embodiment of the present invention. The front view and FIG. 5 are perspective views filled with the potting resin. 1 ... Flexible core yarn, 2 ... Internal electrode, 3 ... Polymer temperature-sensitive layer, 4 ... External electrode, 5 ... Outer cover, 6 ... Connection terminal,
7 ... Connection terminal, 8 ... Eyelet, 9 ... Exposed electrode, 10
…… Potting resin, 11 …… Outer molding part.

Claims (5)

[Claims] 1. A terminal of a heat-sensitive electric wire, comprising a polymeric temperature-sensing material disposed between at least a pair of electrodes, and an outer jacket at least a part of which is made of a barrier resin layer against a dry cleaning solvent. Terminal of the above-mentioned electrode in the above-mentioned part is fitted into an outer shell molded article which is insoluble in the solvent, and a terminal of a heat-sensitive electric wire formed by filling the outer shell molded article with a potting resin insoluble in the solvent. Construction. 2. The terminal structure of a heat-sensitive electric wire according to claim 1, wherein the outer molding and the potting resin are barrier resins against a dry cleaning solvent. 3. The terminal structure for a heat-sensitive electric wire according to claim 2, wherein the barrier resin is selected from a vinyl alcohol copolymer, an acrylonitrile copolymer, a polyamide fluorine-containing polymer and a metal chelate polymer. 4. The terminal structure for a heat-sensitive electric wire according to claim 1, wherein the potting resin is a hot melt adhesive. 5. The terminal structure for a heat-sensitive electric wire according to claim 4, wherein the hot melt adhesive is a polyamide or a carboxyl group-containing polyolefin adhesive.