JPH0821485B2 - 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, a cloth electric warming tool centering on an electric blanket has a problem that it does not cope with stains, and especially when the electric part is in the electric blanket body, it cannot be washed with water.
For washing with water, it is possible to wash with water by taking measures to prevent corrosion of connecting 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] When a conventional electric blanket is dry-cleaned, there are the following major problems.

(1) The electric insulation jacket of the 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 by a dry cleaning solvent such as petroleum or perkylene (tetrachloroethylene). It elutes, the flexibility disappears, and the thickness of the jacket is greatly reduced.

(2) The electrical characteristics of the polymer temperature-sensitive layer of the temperature sensor fluctuate greatly.

(3) The end-processed molded part of the heat-sensitive wire is cracked or contracted due to the elution of the plasticizer.

In such a problem, even if a dry-cleaning countermeasure is applied to the outer cover of the heat-sensitive wire, the dry-cleaning solvent permeates from the exposed electrode part of the heat-sensitive wire end treatment part, and the solvent is inside the polymer temperature-sensitive layer The electrical characteristics change drastically.

Means for Solving the Problems The present invention provides at least a pair of electrodes, a polymer temperature-sensitive layer provided between the electrodes, and an electrode provided outside the electrode and the polymer temperature-sensitive layer and other than the electrode exposed portion. In a heat-sensitive electric wire, which is a barrier resin layer against a dry cleaning solvent, wherein
The exposed electrode part is a polyamide adhesive which is a hot melt adhesive having a barrier property against a dry cleaning solvent, or a carboxyl group-containing polyolefin which is a hot melt adhesive which also has a barrier property against a dry cleaning solvent. It was covered with.

This polyamide-based adhesive or a resin called a carboxyl group-containing polyolefin functions to eliminate the adverse effects of the dry cleaning solvent that is applied electromechanically to the terminal treatment part. Specifically, it has a barrier function against petroleum or halogenated hydrocarbons. It is something to demonstrate. Here, the polymer temperature-sensitive layer of the heat-sensitive electric wire refers to a temperature fuse layer, a polymer thermistor layer, a resistance layer having a large positive temperature coefficient of resistance (hereinafter abbreviated as PTC), and the like. The thermal fuse layer is made of crystalline thermoplastic resin such as nylon 12, and the polymer thermistor layer reduces impedance with temperature rise. Polyvinyl chloride or nylon-based polymeric thermosensitive material And polymer semiconductor materials. The PTC resistance layer is
It is composed of a composite composition in which conductive particles such as carbon black are dispersed in a crystalline polymer matrix.

On the other hand, in dry cleaning, halogenated hydrocarbons such as trichloroethylene, tetrachloroethylene, and chloroethane, and petroleum are used as cleaning agents.

The resin material having a barrier property against petroleum and halogenated hydrocarbons as a cleaning agent, which is used in the present invention, is a material having excellent solvent resistance and non-affinity and having a hydrogen bond, a material having a high bond, and a high bond. Some crystalline materials have this property. Specifically, (1) fluorinated polymers such as polyvinyl fluoride and polyvinylidene fluoride,
(2) Acrylonitrile copolymer such as NBR, (3)
Polyamides such as nylon 11 and 12, (4) Vinyl alcohol copolymers such as ethylene-vinyl alcohol copolymers, partially saponified ethylene-vinyl acetate copolymers, (5) Ionomer, ethylene maleic acid Polymers containing metal chelates such as metal salts, (6) polymers such as high-density polyethylene and highly crystalline polyolefins such as polypropylene, or compositions containing these polymers as base polymers are suitable.

The present invention uses a polyamide adhesive or a carboxyl group-containing polyolefin having properties as a hot melt adhesive among these.

With the above configuration, the permeation of the dry cleaning solvent from the exposed electrode part of the terminal treatment part of the heat-sensitive wire can be suppressed, so that the dry cleaning solvent enters the polymer temperature-sensitive layer of the heat-sensitive wire and has a large electric characteristic. It will never change.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a partially broken sectional view of a heat-sensitive electric wire.

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

2a and 2b are electrode terminal processing parts of the heat-sensitive electric wire, 6 is a connecting member, 7 is a connecting terminal, and 8 is an eyelet.

As shown in FIG. 3, the terminal treatment section of FIGS. 1 and 2 has a barrier property against the dry cleaning solvent,
In addition, it is covered with a polyamide-based adhesive which is a hot melt adhesive or a carboxyl group-containing polyolefin 10, and the gap between the terminal outer shape resin molded portion 11 and the heat-sensitive electric wire 12 and the outer shape resin molded portion 11 and the connection terminal 6 and the connection terminal 7 The permeation of the dry cleaning solvent was stopped by the polyamide adhesive or the carboxyl group-containing polyolefin 10.

After such a structure as shown in FIG. 2, after the terminal treatment shown in FIG. 2, a polyamide-based adhesive or a carboxyl group-containing polyolefin 10 is adhered and solidified at a predetermined position by a potting machine, and then the outer shape resin mold portion 11 is formed as shown in FIG. And complete.

EFFECTS OF THE INVENTION The present invention provides at least a pair of electrodes, a polymer temperature-sensitive layer provided between the electrodes, and a jacket provided outside the electrodes and the polymer temperature-sensitive layer and other than the electrode exposed portion. And a heat-sensitive electric wire in which at least a part of the outer coat is a barrier resin layer against a dry cleaning solvent,
The exposed electrode part is a polyamide adhesive which is a hot melt adhesive having a barrier property against a dry cleaning solvent, or a carboxyl group-containing polyolefin which is a hot melt adhesive which also has a barrier property against a dry cleaning solvent. Since it is covered with, the permeation of the dry cleaning solvent from the exposed electrode part in the terminal treatment part of the heat-sensitive wire is prevented, so that the electrical characteristics of the polymer temperature-sensitive layer of the heat-sensitive wire can be prevented from changing. It can be done.

[Brief description of drawings]

FIG. 1 is a partially broken sectional view of a heat-sensitive wire, FIGS. 2a and 2b are a front view and a side view showing a terminal treatment section of a conventional heat-sensitive wire, and FIG. 3a,
b is a front view and a side view showing a state in which an electrode exposed portion of a terminal of a heat-sensitive electric wire of one embodiment of the present invention is covered with a polyamide adhesive or a carboxyl group-containing polyolefin, and FIGS. 4a and 4b show a terminal treatment portion. It is the front view and side view which show the state which carried out outer shape molding. 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
...... Polyamide adhesive or carboxyl group-containing polyolefin, 11 …… Outer resin mold, 12 …… Electrode wire.

Claims (1)

[Claims] 1. At least a pair of electrodes, a polymer temperature-sensitive layer provided between the electrodes, and an outer cover provided outside the electrode and the polymer temperature-sensitive layer and other than the electrode exposed portion. In a heat-sensitive electric wire in which at least a part of the jacket is a barrier resin layer against a dry cleaning solvent,
The exposed electrode part is a polyamide adhesive which is a hot melt adhesive having a barrier property against a dry cleaning solvent, or a carboxyl group-containing polyolefin which is a hot melt adhesive which also has a barrier property against a dry cleaning solvent. A heat-sensitive electric wire having a terminal structure covered with.