JPH0648794Y2 - Heater sensor wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heater sensor wire used for electric blankets, carpets and the like.

(Prior Art) Generally, a heater sensor wire used in an electric blanket or the like is a primary conductor formed by horizontally winding a ribbon-shaped metal conductor 1b on a synthetic fiber core yarn 1a such as Tetron or vinylon as shown in FIG. 1 and a temperature-sensitive material layer 2 obtained by extrusion-coating the primary conductor 1 with a temperature-sensitive material such as vinyl chloride or polyamide resin.
A secondary conductor 3 formed by horizontally winding a ribbon-shaped metal conductor 3a on the temperature-sensitive material layer 2; and a sheath formed by winding various plastic tapes on the temperature-sensitive material layer 2 or extruding synthetic resin to cover the same. The basic structure is a structure in which layers 4 are sequentially provided.

The ribbon-shaped metal conductor 1b on the side of the primary conductor is made of copper alloy or stainless steel having a substantially rectangular cross section with a flat surface on the long side obtained by rolling a round wire as shown in FIG. There is. Most commonly, a cross-sectional shape with a cross section of 0.5 x 0.05 mm is used.

(Problems to be Solved by the Invention) However, in the case where the ribbon-shaped metal conductor 1b of the primary conductor has a rectangular cross section, the following inconveniences cannot be avoided.

That is, as shown in FIG. 6, when the temperature-sensitive material is extrusion-coated to form the temperature-sensitive material layer 2 on the primary conductor 1, the air in the core yarn 1a expands due to the heat of extrusion of the temperature-sensitive material, Since the ribbon-shaped metal conductor enters the flat surface on the long side of the ribbon-shaped metal conductor and remains in the form of bubbles and cannot be sufficiently escaped, the interface between the ribbon-shaped metal conductor 1b and the temperature sensitive material layer 2 is peeled off.

The ribbon-shaped metal conductor is peeled off from the conductor of the temperature sensitive material layer.
This increases the contact resistance between the temperature sensitive material layer 1b and the temperature sensitive material layer 2 and adversely affects the impedance characteristics between the primary conductor and the secondary conductor, resulting in a decrease in the temperature detection sensitivity of the heater sensor wire.

(Means for Solving the Problem) Here, in order to solve the drawbacks of the heater sensor wire, the inventors have made extensive studies on prevention of separation between the ribbon-shaped metal conductor of the primary conductor and the temperature sensitive material layer. As a result, this invention was completed.

That is, the present invention provides a primary conductor obtained by horizontally winding a ribbon-shaped metal conductor on a synthetic fiber core yarn, and extrusion-coating the primary conductor with a temperature-sensitive material such as vinyl chloride or polyamide resin. A temperature-sensitive material layer, a secondary conductor formed by horizontally winding a ribbon-shaped metal conductor on the temperature-sensitive material layer, and a sheath layer formed on the secondary conductor by extrusion coating of a synthetic resin. In this heater sensor wire, the ribbon-shaped metal conductor of the primary conductor has an oval cross section and is used.

(Operation) In the present invention, since the ribbon-shaped metal conductor of the primary conductor has an oval cross-section, the expanded air due to the extruding heat of the above-mentioned temperature-sensitive material is the ribbon-shaped metal conductor. Even if it enters between the metal conductor and the temperature sensitive material layer, it easily escapes to both sides along the oval curved surface of the primary conductor.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the heater sensor wire of this invention, the primary conductor,
The temperature sensitive material layer, the secondary conductor, and the sheath layer have the same basic configuration as that shown in FIG. 3, and the description thereof will be omitted.

In this invention, the ribbon-shaped metal conductor of the primary conductor 1 is used.
As shown in FIG. 1, 11b has an oval cross section.

Specifically, the oval shape has a long side, a short side, and a short side central curved surface swelling portion size of 0.4 × (0.05 + 1/100 to 5/10), respectively.
As an example, it is assumed that a 0.5 × 0.05 mm cut wire is processed so that it becomes 0) mm.

The ribbon-shaped metal conductor 11b having such an oval cross section is used as the core yarn 1
When the temperature-sensitive material is extrusion-coated to form the temperature-sensitive material layer 2 on the primary conductor 1 formed by winding the wire 1a in a horizontal direction, as shown in FIG. Metal conductor 11b
It is easy to escape to both sides of the curved surface, and air is not retained at the interface with the temperature-sensitive material layer 2 so that separation between the temperature-sensitive material layer and the primary conductor does not occur.

In addition, as shown in the figure, the gap (A) with the core yarn 11a formed on the opposite side of the curved surface serves as an escape portion for the air to further promote the prevention of peeling.

As a result, the functional deterioration of the temperature detection sensitivity of the heater sensor wire due to the peeling between the temperature sensitive material layer 2 and the primary conductor 11b can be significantly reduced.

Example 1 and Comparative Example 1 As shown in FIG. 4, a Mn-Zn-Cu alloy ribbon having the following cross-sectional shape was horizontally wound at a pitch of about 1.0 mm on a 1500 denier tetron core yarn 11a, and a polyamide resin was applied thereon. The temperature sensitive material layer 2 having a thickness of 0.25 mm was formed.

Sectional dimension of the primary conductor of the example 0.4 × (0.05 + 1/100 to 5/10
0) (Oval) Cross-sectional size of the primary conductor of the comparative example 0.5 × 0.05 mm The cut portion of the obtained core was immersed in an aqueous ink for 1 minute and then disassembled to form an alloy of the polyamide resin temperature sensitive material layer 2 and the primary conductor. The presence or absence of ink penetration between the ribbon interfaces was observed.

Ink penetration was not observed at all in the example product, while a large number of bubbles were observed in the comparative product along the entire length of the alloy ribbon.

The impedances at 20 ° C. and 50 ° C. of the sensor wires according to the above-mentioned Example (without bubbles) and Comparative Example (with bubbles) were measured, and the results are shown in the following table.

That is, according to the above table, the example product (without bubbles) has a large decrease in characteristic value and a large inclination in the practical temperature range of 20 to 50 ° C. as compared with the comparative example product (with bubbles). Means that its sensitivity characteristics are improved.

(Effects of the Invention) As described above, the present invention is a heater sensor wire having a basic structure including the primary conductor, the temperature-sensitive material layer, the secondary conductor, and the sheath layer. The oval shape can prevent the occurrence of peeling at the interface between the ribbon-shaped metal conductor and the temperature-sensitive material layer.

As a result, there is an effect that the deterioration of the impedance characteristic at the interface can be prevented and the sensitivity characteristic of the heater sensor wire can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a ribbon-shaped metal conductor having an oval cross-section in the present invention, FIG. 2 is a partial cross-sectional view of the same winding portion, and FIG. 3 is a part of a heater sensor wire. FIG. 4 is a cutaway sectional view, FIG. 4 is an explanatory view of an embodiment of the present invention, FIG. 5 is a sectional view of a conventional ribbon-shaped metal conductor, and FIG. 6 is a partial sectional explanatory view of the same winding portion. 1a, 11a …… Core thread, 1b, 11b …… Ribbon-shaped metal conductor, 1 ……
Primary conductor, 2 ... Temperature sensitive material layer, 3 ... Secondary conductor, 4 ... Sheath.

Claims (1)

[Scope of utility model registration request] 1. A primary conductor obtained by horizontally winding a ribbon-shaped metal conductor on a synthetic fiber core yarn, and extrusion-coating the primary conductor with a temperature-sensitive material such as vinyl chloride or polyamide resin. A temperature sensitive material layer, a secondary conductor formed by horizontally winding a ribbon-shaped metal conductor on the temperature sensitive material layer, and a sheath layer formed on the secondary conductor by extrusion coating of synthetic resin. In the heater sensor wire, a heater sensor wire having an oval cross section is used as the ribbon-shaped metal conductor of the primary conductor.