JPH01258386A - Helical wire and plane-form heating body using helical wire - Google Patents

Abstract

PURPOSE:To improve the extension/contraction property, the durability, and the electric contact to a heating element, and to stabilize the electric continuity, by composing an electrode wire with a helical wire which consists of a sheath of a conductive thread-form material and a core, and setting the extension when a load is applied to the helical wire at a specific value. CONSTITUTION:A helical wire 1 consists of a core thread 2 and a sheath of a conductive thread-form material 3, and it is used as the electrode wire of a plane-form heating body. The extension of the helical wire 1 when a load of 200g is applied is set 2.0% or more. As a result, an excellent extension and contraction performance can be obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention has elasticity, good electrical contact with the heating element, stable conductivity, and can withstand long-term use. This invention relates to an electrode wire and a planar heating element using the same.

(Prior art) Helical electric wires are known in the past, in which a synthetic fiber is used as a core yarn and metal foil is wound around the core yarn in a spiral shape. , for example, is disclosed in Japanese Utility Model Publication No. 40-28706.

(Problem to be Solved by the Invention) However, the above-mentioned electrode thread has poor electrical contact with the heating element when woven into the sheet heating element, so it has stable current conductivity required for the sheet heating element. was not obtained.

The present invention improves these conventional problems and provides an electrode wire that is stretchable, has good electrical contact with the heating element, has stable current conductivity, and can withstand long-term use. A planar heating element using this is provided.

(Means for Solving the Problems) The helical wire of the present invention has the following configuration in order to achieve the above object. That is, it is a helical electric wire consisting of a sheath portion of a conductive filament and a core portion of yarn, and is characterized by an elongation of 2.0% or more under a load of 200 CI.

Moreover, the planar heating element using the helically wound electric wire of the present invention has the following configuration. That is, it is a planar heating element in which a heating element, an electrode wire, and a non-conductive thread are woven or knitted, and the electrode wire is a sheath of a conductive thread and a non-conductive thread. Consisting of the core, 200 CI
This sheet heating element is characterized by being a helical wire having an elongation under load of 2.0% or more.

The helical electric wire of the present invention uses highly elastic yarn in the core, so that even after the core is spirally wound and covered with the sheath, the helical electric wire as a whole has excellent elasticity. It has the characteristics of

The elongation under a load of 200q is measured by the method specified in JIS L 1013.

The elasticity of the core greatly affects the elasticity of the core-sheath structure yarn, and when it is wound with the non-stretchable sheath, which will be described later,
Since the elasticity of the helical electric wire is greatly suppressed,
It is preferable that the elongation of the core portion before being wound around the sheath portion is large.

Core elongation of at least 20%, preferably 30%
% or more, more preferably 50% or more. Particularly preferred is a material that stretches 100% or more. However, no existing materials are known to have a ratio of more than 800%.

Examples of such a core having stretchability include stretchable threads made of synthetic fibers, elastic polymer fiber threads, rubber threads, etc. when rough stretchability is desired.

In addition, conductivity can be imparted to the above yarn as necessary,
It is also preferable to mix conductive raw fibers into the above yarn.

Examples of synthetic fiber materials include polybutylene terephthalate and polyethylene terephthalate.

Examples include polyamide. In addition, examples of such stretchable synthetic fiber yarns include woolly yarns, bulerilla yarns, springy yarns, and the like.

Examples of the elastic polymer fiber material include polyurethane and polyester elastomer.

Examples of the rubber thread include rubber threads made of natural rubber and synthetic rubber.

In addition to the above-mentioned stretchable threads, the elongation of the core can be adjusted by pulling or covering ordinary non-stretchable fibers with a certain amount of slack.

Next, the conductive filamentous material constituting the sheath portion of the present invention will be explained.

The shape of the conductive filament constituting the sheath of the present invention may be a filament with a round cross section, but it is easier to wrap and cover the core filament if it is in the shape of a band or tape. This is preferable because it can slide in the twisted state following the expansion and contraction of the core yarn, and does not impair the elasticity of the helically wound electric wire as a whole.

Furthermore, the conductive filamentous material constituting the sheath of the present invention does not necessarily have to have uniform conductivity in the cross-sectional direction; A metal coating formed by , vapor deposition, sputtering, etc. is also used.

As the material for the conductive filament, in addition to ordinary conductive metals, conductive polymers can also be used.

Common conductive metals include gold, silver, copper, and iron.

Examples include tin, nickel, chromium, and other conductive metals, as well as their alloys, and copper, tin, and their alloys are preferably used from the viewpoint of conductivity and cost.

Furthermore, examples of conductive polymers include polythiazyl, polyacetylene, polydiacetylene, polypyrrole, polyparaphenylene, polyparaphenylene sulfide, and the like.

The conductive filament used in the present invention is particularly preferably a metal foil in terms of strength, surface hardness, and ease of following the expansion and contraction of the core filament.

Such a conductive filament is wound around the core to form a core-sheath structure, and depending on the winding, the current conduction performance can be improved and further stabilized.

That is, although the thread of the core may be untwisted, if it is a twisted thread, the sheath of the conductive filament can slide smoothly on the thread surface of the core. In particular, if the sheath portion of the conductive filament is wound in the opposite direction to the twisting direction of the core yarn, it is possible to slide the conductive filament more smoothly, prevent the occurrence of snarls in the core-sheath yarn, and enable stable processing. In general, by twisting the conductive filament itself, its sliding performance is further improved.

The elongation of the helical electric wire of the present invention obtained as described above must be 2.0% or more under a 200Q load in order to stabilize the contact state between the helical electric wire and the heating element. It won't happen. If the elongation of the helical wire under a load of 200 g is less than 2.0%, there is a problem that the contact state between the helical wire and the heating element is not stable.

The helically wound electric wire of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing an example of the helical wire 1 of the present invention. The core part 2 is a twisted yarn of polyurethane elastic fibers, and the sheath part 3 is a copper foil wire formed by rolling copper wire, which is twisted in the opposite direction to the twisting direction of the twisted yarn in the core part. . Figure 2 shows the single-wound helical wire shown in Figure 1 with two more layers =
It is made of helical wire with copper foil wire wrapped around the base layer. From the point of view of current-carrying performance, it is preferable for the present invention to wrap the sheath in multiple layers rather than in a single layer, as this makes it easier to move the sheath and improves current-carrying performance. Furthermore, as shown in Figure 2, by increasing the width of the copper foil wire toward the outer layer,
The inner copper foil wire exerts a roller action, making it easier for the outer layer sheath to move, and the outer layer's wide foil wire action makes it difficult to cover the core yarn with the inner layer's narrow foil wire alone. Since it completely covers the parts that were not covered, the current carrying performance is roughly stabilized.

The helical wire of the present invention is suitable for use as an electrode wire for electrical products that require flexibility and flexibility, or for electrical products that are subject to repeated expansion and contraction, by taking advantage of its stretchability.

For such uses, it is particularly suitable for electrode wires for various planar heating elements.

Particularly, a planar heating element is mentioned in which the heating element is a filamentous heating element made of a conductive layer of a synthetic resin containing a core thread and conductive particles formed around the core yarn dispersed therein.

The filamentous heating element not only functions as a heating element because fine carbon particles are dispersed in the conductive layer on the surface, but also the conductive layer is made of a polyurethane elastic material that is relatively soft and has excellent extensibility. It has the property of bending freely, so it can be used as a component of fabric.
Moreover, it has the advantage of not impairing the flexibility of the fabric.

The helical wire of the present invention is extremely compatible with the filamentous heating element, and when the filamentous heating element is used as an electrode wire of a fabric-shaped sheet heating element as a heating element, the flexibility of the filamentous heating element can be improved. An extremely flexible planar heating element can be obtained without damage. Further, the helically wound electric wire of the present invention can follow the expansion and contraction of the planar heating element.

Furthermore, it is preferable to use non-conductive threads with high elasticity as part of the warp threads, since it is possible to obtain a planar heating element that extends greatly in the warp direction. Elongation of non-conductive yarn under 200C1 load 2
．． It is highly preferable to have elasticity of 0% or more. Since such a sheet heating element has excellent adhesion to objects to be kept warm, it can be used in a wide variety of applications.

As the weaving and knitting structure of the planar heating element using the helical electric wire of the present invention, a normal textile structure or a normal warp knitting structure is used,
Preferred examples include plain weave for woven fabrics, and weft-inserted raschel for warp knitting. In order to arrange the helically wound electric wire of the present invention orthogonally to the heating element, it is preferable to use the helically wound electric wire as the warp of the woven or knitted material, and to use the heating element as the weft of the woven or knitted material.

The helical electric wire of the present invention is characterized in that it holds the filamentous heating element in a hugging manner from both the front and back sides as a stretchable electrode wire, and also holds it stably by tightening it with a rubber string.

Further, if desired, the electrode wire is stretched to a greater extent and knitted to form a knitted fabric structure, and then returned to a non-tensioned state to form a sheet heating element 1q.

FIG. 3 is an example showing a planar heating element using a helically wound electric wire according to the present invention. As shown in FIG. 4, the helical electric wire 1 forms a weave structure with the filamentous heating element arches.

Hereinafter, the present invention will be specifically explained with reference to Examples.

(Example) [Example 1] Production of coiled electric wire> False-twisted yarn of polybutylene terephthalate fiber having a breaking elongation of 35% “Samorapa (manufactured by Toshi Co., Ltd., registered trademark 1) [150D-48f] After arranging 2 mizuhiki, 100T
/m into S-twisted yarn to form a core.

On the other hand, in the sheath part, 0.1mmφ copper wire is connected to 0.25mm and 0.
．． Using a copper foil wire rolled to a width of 35 mm, using an Italian twisting machine, a copper foil wire with a width of 0.25 mm was applied to the above core part in seven directions for the - layer, and a width of 0.35 mm was used for the second layer. Each of the copper foil wires was wound in the S direction to produce a stretchable electrode wire consisting of a double-layered core-sheath structured thread. The elongation at break of the electrode wire was 32%.

Preparation of thread-like heating element> Polyester type urethane resin (Dainichiseika Products) containing 40% by weight of carbon particles with an average particle size of 40 mμ was mixed with methyl ethyl ketone and dimethyl formamide at a weight ratio of 80:
It was uniformly dissolved in a mixed solvent of 20% to a concentration of 24% by weight to obtain an impregnating liquid.

While stirring the impregnating liquid, add polyester 2 into it.
Spun yarn of No. 0 twin yarn (0.56 mmφ) at 20°C for 2 m/
After dipping and passing through the yarn at a speed of 10 minutes, the amount of yarn attached was adjusted using a die having a diameter of 0.6 mm. After that, 120 consecutive
A layer of carbon particles dispersed in urethane resin was dried and fixed around the core thread by passing through a dryer adjusted to 'C'.

A second stage treatment and a third stage treatment were repeated using the same method as this first stage drying and fixing process. At this time, the diameter of the dice was gradually increased.

Preparation of square-shaped heating element> In this way, 1q strand-shaped heating element and polyethylene terephthalate spun yarn (No. 5 single yarn) were used as the weft, and the stretchable electrode wire and polyethylene terephthalate Taslan processed yarn <250D-24f) were used as the warp. A plain weave fabric was woven using this method. At this time, five stretchable electrode wires were lined up 1 cm inside from both edges of the fabric, and 5Qc
They were placed at intervals of m. A planar heating element having a length of 50 cm, a width of 54 cm, and a resistance value of 101 Ω was obtained by cutting the fabric.

The center part of this sheet heating element has a diameter of 5 mm in the direction perpendicular to the electrode wire.
, the resistance value measured after holding the sheet heating element with two aluminum round bars of length 60cm, fixing the gripping part, and repeatedly bending one side of the sheet heating element (±45°) 100 times was 100Ω. Met.

[Example 2] Polyethylene terephthalate false twisted yarn (2
50D-24f), we used a double structure yarn (50
A planar heating element having a warp elongation at break of 35% was obtained in exactly the same manner as in Example 1, except that a 0D (equivalent to 0D) was used. length 2 width,
The resistance value was the same as that of the planar heating element of Example 1.

The resistance value measured after gripping both ends of this sheet heating element and applying tension to stretch it by 25% in a direction parallel to the electrode wire and returning it to its original position 100 times was 102Ω.

[Example 3] Polyethylene terephthalate false twisted yarn (2
50D-24f), polybutylene terephthalate (150D-48f) with a breaking elongation of 40% and a breaking elongation of 3
0% polyethylene terephthalate false twisted yarn (250
A planar heating element having a warp elongation at break of 30% was obtained in exactly the same manner as in Example 1, except that D-24f) was used. length 2
width.

The resistance value was the same as that of the planar heating element of Example 1.

The resistance value measured after gripping both ends of this sheet heating element, applying tension, elongating it by 25% in a direction parallel to the electrode wire, and returning it to its original position was repeated 100 times.

[Example 4] 0.25 m of 0.1 mmφ copper wire was used as a spiral electric wire.
A helical electric wire made by rolling a copper foil wire to m width and twisting it at 2200T/m and wrapping it around a core polyurethane elastic thread 1600D was used as the electrode wire, a polyurethane elastic thread with a breaking elongation of 350% was used as the core, and a sheath Core-sheath structure yarn with cotton thread (500
A planar heating element having a vL breaking elongation in the warp direction of 30% was obtained in exactly the same manner as in Example 1 except that the warp yarn (equivalent to D) was used as the warp.

The length, width, and resistance value were the same as those of the planar heating element of Example 1.

The resistance value measured after gripping both ends of this sheet heating element, applying tension, elongating it by 25% in a direction parallel to the electrode wire, and returning it to its original position was repeated 100 times.

(Effect of the invention) If the helical wire of the invention is used as an electrode of a planar heating element,
By weaving or knitting the helical electric wire in a pre-stretched state, it has the characteristic of exhibiting a clip effect that always firmly grips the linear heating element used as a part of the weft.

Therefore, the planar heating element using the helical electric wire of the present invention has good electrical contact between the linear heating element and the helical electric wire, has stable current conductivity, and can withstand long-term use. It has the following characteristics.

Furthermore, if a highly elastic non-conductive yarn is used as part of the warp threads, it is possible to obtain a planar heating element that extends greatly in the warp direction. Since it has excellent adhesion to heat-retaining objects, it can be widely used in clothing, medical applications, and industrial material applications, and is particularly preferably used in thermal supporter 1 compresses, chair underlay heaters, and the like.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the helical wire of the present invention. Figure 2 shows the helical wire shown in Figure 1 with an additional
It is a side view of a helical electric wire wrapped with copper foil wire. FIG. 3 is a plan view showing an example of a planar heating element including a helical electric wire according to the present invention, and FIG. 4 is a cross-sectional view of the planar heating element cut along the helical electric wire. In the figure, 1: Helical electric wire 2: Core thread 3: Conductive thread-like material 4: Thread-like heating element

Claims (2)

[Claims] (1) A helical electric wire consisting of a sheath portion of a conductive filament and a core portion of yarn, and characterized in that the elongation under a load of 200 g is 2.0% or more. (2) A planar heating element formed by weaving or knitting a heating element, an electrode wire, and a non-conductive thread, wherein the electrode wire is a helical electric wire according to claim 1. Features a sheet heating element.