JPH0755838Y2 - Heat sensitive wire - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a heat-sensitive wire used for electric blankets and electronic carpets, and more particularly to a heat-sensitive wire of a simple terminal processing type having improved sheath sheath peeling property. It comes. That is, at the same time as stripping the sheath with the wire stripper,
The present invention relates to a heat-sensitive wire improved so that even a PET (polyethylene terephthalate) separator layer can be stripped off.

(Prior Art) Conventionally, this type of heat-sensitive wire insulation material is a special thermistor plastic, and to prevent migration of plasticizer from the outer PVC sheath, polyethylene terephthalate (PET) tape or a separator layer is used as a separator layer. Nylon coating or nylon tape is applied to the inside of the PVC sheath. This separator layer is wound horizontally on the tape, along the length of the tape,
Although it is formed by coating with resin, etc., generally PE
The one that is formed by winding T tape horizontally is often used.

In any case, the effect of the separator layer is to minimize the long-term change in the impedance characteristic of the insulating material layer, which is an important characteristic of such a heat-sensitive wire, over time.

However, the conventional heat-sensitive wire having such a structure has a large sheath peeling workability at the terminal portion, except for the above-mentioned longitudinal alignment, because the separator layer is likely to remain and it takes a long time to remove it. It's a problem.

In addition, in the above-mentioned tape longitudinal alignment, there is a weak point in the fitting property with the insulating layer and the sealing property, and also in the sheath extrusion processability, at the time of linear velocity neck, continuous extrusion, cutting tape,
The problem is that the loss at the time of speech is large, and many manufacturers do not adopt it.

(Problems to be solved by the invention) A wire stripper is usually used for such a conventional sheath stripping jig for the end portion of the heat-sensitive wire, but the separator layer is formed by tape winding or thin-wall extrusion. If the material is thin, it is thin and easily remains, and it becomes difficult to peel it off with the blade of the stripper. Therefore, the work was changed to another jig, and the work of carefully peeling off the secondary conductor and below so as not to damage it became a neck process for the work of exposing the secondary conductor. That is, the biggest drawback is that the PET tape of the separator layer remains when the wire stripper is used for stripping the sheath, and it takes time and effort to expose the secondary conductor and below.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of conventional heat-sensitive wires, and provides a heat-sensitive wire provided with a separator layer that can be used to strip the sheath at the same time with the wire stripper.

(Means for Solving the Problem) As a result of intensive studies, the present inventor has completed the present invention by adopting a configuration according to the following method.

According to the present invention, a primary conductor wound along a longitudinal direction on a core material such as a tetron yarn, a temperature sensitive material layer coaxially provided on the outer circumference thereof, and a temperature sensitive material layer wound around the primary conductor along the longitudinal direction 2 A secondary conductor, a plastic separator layer formed by winding the tape longitudinally, longitudinally along the tape, or a resin coating along the longitudinal direction on the outside of the next conductor, and coaxially provided on the outside of the separator layer.
A PVC sheath material layer and a fusion material layer coaxially provided on the outside of the PVC sheath material layer are provided, and the plastic separator layer firmly adheres to the PVC sheath material layer by the following method. Is formed.

(B) Form an adhesive layer on one side of the plastic tape (the surface that contacts the PVC sheath material layer) to strengthen the adhesion with the sheath material layer.

(B) One surface of the plastic tape (the surface in contact with the PVC sheath material layer) is roughened by etching, embossing, or the like to firmly adhere to the sheath surface.

(C) PE by sheath extrusion and tandem (or pretreatment)
The surface around which the T-tape is wrapped is coated with a hot melt adhesive to strengthen the adhesion with the sheath layer.

By taking the above-mentioned adhesion means, the heat-sensitive wire of the present invention can be a terminal-sensitive simple heat-sensitive wire in which the stripping of the sheath can be peeled off at the same time when the sheath of the sheath is peeled off by the wire stripper.

As shown in the drawings, the heat-sensitive wire of the present invention is provided with a core material 1 such as a tetron yarn, a primary conductor 2 wound around the core material 1 in the longitudinal direction, and coaxially on the outer periphery thereof. The temperature sensitive material layer 3 and the secondary conductor 4 wound around the temperature sensitive material layer 3 in the longitudinal direction.
And a separator layer 5 made of PET formed by winding the tape horizontally along the lengthwise direction, along the lengthwise direction of the tape, or by resin coating, and a PVC sheath material layer coaxially provided outside the separator layer 5. In the heat-sensitive wire composed of 6 and the PE fusion bonding layer 7 provided coaxially on the outside of the same, the separator layer 5 is firmly adhered to the PVC sheath material layer 6.

(Embodiment) An embodiment of the present invention will be described below.

FIG. 1 is a structural explanatory view showing a terminal portion of a heat-sensitive wire according to an embodiment of the present invention with a part thereof removed. FIG. 2 is an enlarged schematic sectional view of the PET tape 5 forming the separator layer in FIG. The width of the PET tape 5a is 4 to 8 mm, the thickness of the tape is 16 to 25 μm, and the adhesive coating layer 9 is provided on the outer surface of the PET tape 5 and the PVC sheath material layer 6 on the outer side. Provided for direct bonding. The adhesive coating layer 9 has a thickness of 1 μm and is made of a Surlyn-based or urethane-based material.
Made of EVA hot melt resin. In this case, the heat of the PVC sheath coating melts the adhesive agent of the tape, resulting in strong adhesion.
When stripped with a wire stripper, sheath 6 and PET
While being in close contact with the tape 5a, PE at the stripper blade
The T-tape 5a is cut off, and the secondary conductor 4 and below are exposed, which greatly simplifies the mouth peeling process.

Next, FIG. 3 shows an enlarged cross section of the PET tape 5 forming the separator layer in another embodiment of the present invention. The width of the PET tape 5a is 4 to 8 μm. In this case, PET
One surface of the tape 5a, that is, the surface that is in direct contact with the outer PVC sheath material layer 6 is roughened by etching or embossing. Adhesion to the sheath material layer 6 is stronger than that of the untreated PET tape 5a, and PV can be processed with a single wire stripper.
The PET tape layer 5 of the separator peels well with C sheath easily.

In this case, nylon tape can be used instead of PET tape.

Next, in the actual manufacturing of the present invention, a general PET tape that has not been treated is wound around an insulator, and the sheath is extruded, and a method in which the PET tape is hot-melt coated before sheathing with tandem is used. You can also

(Effect) The heat-sensitive wire of the present invention can remove the separator layer at the same time when the sheath is stripped by the wire stripper, so that the terminal processing time of the user can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a terminal portion of a heat-sensitive wire according to an embodiment of the present invention with a part thereof removed, and FIG. 2 shows a separator layer of a PET tape according to an embodiment of the present invention. 3 is an enlarged schematic sectional view, and FIG. 3 is an enlarged schematic sectional view of a separator layer of a PET tape according to another embodiment of the present invention. 1 …… Core material such as Tetoron yarn 2 …… Primary conductor 3 …… Temperature sensitive material layer 4 …… Secondary conductor 5 …… PET tape separator layer 5a …… PET tape separator layer 6 …… PVC sheath Material layer, 7 PE fusion layer 8 Etching or embossing layer 9 Adhesive layer

Claims (1)

[Scope of utility model registration request] 1. A primary conductor wound along a longitudinal direction on a core material such as tetron yarn, a temperature sensitive material layer coaxially provided on the outer periphery thereof, and a temperature sensitive material layer wound around the primary conductor. A secondary conductor, a plastic separator layer formed by winding the tape horizontally, longitudinally along the tape along the longitudinal direction on the outside of the secondary conductor, or resin coating, and a PVC sheath material coaxially provided on the outside of the separator layer. A layer, and further a fusion material layer coaxially provided on the outside thereof, wherein the plastic separator layer is roughened by etching or embossing one side of the plastic tape, or an adhesive coating layer. A heat-sensitive wire characterized in that it is formed in close contact with the PVC sheath material layer by a desired method such as forming a composite tape.