JPH0313994Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sheet heating element in which a filamentous heating element is woven into a fabric. This invention relates to a planar heating element that prevents misalignment of the contact point with the filamentous heating element and strengthens the contact.

[Prior Art] For example, heating appliances such as electric blankets and electric carpets have become extremely popular due to their convenience.
These products are required to have characteristics such as being highly flexible, conforming well to the user's body, not having a hard feel, and being able to be folded and stored compactly when not needed. Various efforts have been made to obtain this. For example, a filament of synthetic fiber is used as a core, and an extremely thin stainless steel wire is wound around it in a spiral to create a linear heating element, which is then sewn into a blanket, etc., or carbon particles are dispersed in a resin binder. There are sheet heating elements made by coating, impregnating, and fixing a film or fabric.

However, in the case of using the above-mentioned linear heating element, the heating element gives the user a feeling of being a foreign body, and in the case of using carbon particles fixed to the film or cloth,
It has a stiff feel and cannot provide a good feeling of use.

On this point, it is preferable to use a thread-like heating element to create a cloth-like sheet heating element, since the contact points between the warp and weft are not fixed, which increases flexibility.
On the other hand, misalignment also occurs at the contact portion between the electrode and the filamentous heating element, and there is a problem in that the contact resistance increases with long-term use, resulting in instability and the risk of fire. This problem cannot be sufficiently alleviated by coating with a flexible resin that also serves as electrical insulation.

In order to solve this problem, it may be possible to weld the electrode and the filamentous heating element or to fix it with a conductive adhesive, but this would drastically reduce the flexibility of this part and cause problems in the feel of clothing, etc. This method cannot be applied in some cases, and it is an important technical issue in obtaining a fabric-like sheet heating element that improves the increase in contact resistance.

[Purpose of invention]

The present invention was made to solve the above problems, and it prevents performance deterioration due to misalignment between the thread-like heating element woven into the fabric-like sheet heating element and the electrode wire, and deterioration of flexibility. The object is to provide a planar heating element that is achieved with as few heating elements as possible.

[Structure of the idea]

The structure of the planar heating element of the present invention to achieve the above object is a filamentous heating element in which a polyurethane resin in which carbon particles are dispersed is laminated and coated around a weft yarn and a core yarn; A non-conductive thread is used to adjust the amount of heat generated, and a non-conductive thread is used for the warp, and a conductive wire for the electrode is placed at a predetermined position. , heat-shrinkable threads are weaved into a fabric, the electrode conductive wire portion is heat-treated, the heat-shrinkable thread is shrunk, and the electrode conductive wire is tied to a thread-like heating element.

As means for twisting the twisting thread to tightly bind the filamentous heating element and the electrode wire, a twisting weaving device can be used.

〔Example〕

Hereinafter, the present invention will be explained in more detail using an example. FIG. 1 is a perspective view for explaining the configuration of a filamentous heating element 1 used in this embodiment. 20
Carbon particles with a particle size of 20 mμ are placed around the core yarn 2, which is made of triple-twisted polyester fiber spun yarn, with a concentration of 12% by weight, 10% by weight, and 5% by weight from the inner layer to the outer layer, respectively. Three conductive layers 3, 4, and 5 are formed of a polyester-based polyurethane resin (manufactured by Dainichiseika Kagyo Co., Ltd.) containing a polyester-based polyurethane resin dispersed therein. This filamentous heating element 1 is highly flexible,
Excellent mechanical strength such as bending resistance and abrasion resistance,
It had an electrical resistance value of 12.8kΩ. The thickness of the filamentous heating element used is usually 0.4 to 0.6 mmφ, preferably 0.5 to 0.55 mmφ.

FIG. 2 is a plan view for explaining the outline of the structure of the planar heating element 6 of this embodiment, and FIG. 3 is an enlarged partial plan view for explaining the part of the woven fabric shown in FIG. It is.

As the weft of the planar heating element 6 of this example, spun yarn (No. 20 double yarn) of polyester fiber, which is not specifically shown in the filamentous heating element 1 and FIG. 2, was used.

Further, as the warp threads, an electrode wire 8 made by twisting extremely thin stainless steel wires and a spun thread as a double thread of polyester fiber (not specifically shown) were used.

The thread 9 is made of a double-thread spun yarn of heat-shrinkable isophthalic acid copolymerized polyester fiber, and is used only in the warp portion where the electrode wire 8 is used. Two wires were made into a set, and all the weft threads intersecting with the electrode wires 8 were twisted to finish the weaving. That is, as shown in the figure, the thread 9
straddles the two electrode wires 8 ₁ and 8 ₂ in parallel with the filamentous heating element 1 and the weft 7, and when crossing the weft, crosses the electrode wire 8 and the weft 7 on the opposite side of the electrode wire 8. Press firmly against the warp side. In this example, after weaving, heat treatment was performed at 170° C. to heat-shrink the twisting threads 9 and further strengthen the binding force. Therefore, the warp and weft of the electrode portion do not adhere to each other, but are simply tightly pressed and bound, thereby suppressing the decrease in flexibility as much as possible.

Note that the present invention does not preclude further use of a conductive resin to improve conductivity, if necessary.

The electrode wires 8 may be placed at or near both ends of the fabric when weaving large items such as bedding, carpets, etc., or agricultural items; If you do,
Electrode wires 8 are woven at predetermined intervals and cut into pieces for use. Further, it is preferable to use twisted wires as the electrode wires 8 because they become flexible and the contact area with the filamentous heating element 1 increases.

The surface of the sheet heating element of the present invention can be coated or laminated with a flexible electrical insulator as required by law or as desired. These materials are generally silicone resin, soft vinyl chloride resin, epoxy resin, acrylic resin, polyethylene resin, etc. For coating, the sheet heating element is immersed in an appropriate solution or melted material.
Alternatively, it can be carried out by coating.
Further, during coating, an anchor coat can be used as appropriate for the purpose of improving adhesion. or,
To laminate, appropriately selected materials are formed into a film and laminated by adhesion or fusion.

As mentioned above, the planar heating element of the present invention is flexible, and can be used in (1) cold-weather clothing fields such as rider suits, fishing clothes, diver clothes, inner suits, and various business clothes;
Underwear, etc., (2) Carpets as cold protection bedding,
Blankets, sports lap blankets, moquettes for trains, buses, etc.; (3) mats and other medical sheets that use far infrared rays in the medical field; (4) gloves, shoes, socks, (5) Floor materials, kotatsu materials, etc. as building materials for heating; (6) Insulation of office equipment, automobile instruments, etc. as electrical materials; (7) Insulation of seedbeds, curing, etc. as agricultural and civil engineering materials. It can be advantageously used as a heat generating material for various purposes.

[Effect of idea]

The planar heating element of the present invention uses a filament-shaped heating element that has high flexibility and mechanical strength by laminating a polyurethane resin with carbon particles dispersed on a core thread to form a conductive layer. Moreover, it is possible to obtain a planar heating element with high strength.Also, by weaving heat-shrinkable threads into the conductive wire for electrodes and shrinking the heat-shrinkable threads by heat treatment, the thread-like heating element and electrodes can be fabricated. Since the contact portion with the conductive wire is tightly tied, it is possible to prevent the contact portion from becoming poor over a long period of time, and to prevent deviations in the amount of heat generated and generation of heat in the electrode portion. Therefore, there is no need to harden the filamentous heating element, electrode wire, and resin, and the heating element can be advantageously used as a heating element for cold weather clothing that is repeatedly bent during use.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view for explaining the structure of the filament heating element used in the example;
The figure is an explanatory diagram showing the state of the weaving according to this embodiment, and FIG. 3 is a partial plan view of the planar heating element of this embodiment. 1... Filiform heating element, 6... Planar heating element, 7...
Weft thread, 8, 8 ₁ , 8 ₂ ... electrode wire, 9 ... pinning thread.

Claims (1)

[Scope of utility model registration request] A filament-like heating element is coated by laminating a polyurethane resin with carbon particles dispersed around the core yarn around the weft yarn, and a non-conductive thread is used to adjust the calorific value as necessary. conductive thread, and
In addition to using a conductive wire for electrodes arranged at a predetermined position, heat-shrinkable yarn is woven into the conductive wire for electrodes to form a fabric, and the conductive wire portion for electrodes is heat-treated to shrink the heat-shrinkable wire. A fabric-like sheet heating element in which conductive wires for electrodes are tied to the yarn heating element by contracting the elastic yarn.