JPH09115655A - Sheet type heating fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet type heating element comprising fabric which is thin and soft, and in which the whole body of a heating surface is capable of extremely uniformly generating heat without heat irregularity. SOLUTION: Insulating fibers are used as warps 1, and conductive fibers are used as wefts 2. The wefts at a center part C in the width direction are kept in a non-contact condition in weaving them. The wefts at one side end part A are woven in a contact condition with the wefts which are woven immediately before them, and the wefts at the other side end part B are woven in a contact condition with the wefts which are woven immediately after them. The wefts in the whole fabric are electrically connected to each other serially.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like heat generating fabric which is particularly suitable for embedding in a rubber sheet for snow removal, for example.

[0002]

2. Description of the Related Art Conventionally, as a planar heating element composed of fibers that generate heat when electricity is applied, for example, a surface having a structure as shown in FIG. 2 described in JP-A-5-47458. Heat-generating knits are known. FIG.
2A is a partial plan view showing an unfinished product of the embodiment, and FIG.
(B) is a partial plan view showing a finished product of the embodiment.

The above-described sheet-like heat generating knit is a covered heater wire 2 in place of a plurality of fiber yarn knitting rows arranged in parallel with each other, instead of the fiber yarn knitting row at appropriate intervals.
In the planar heating knit 21 formed by knitting the heater wire knitting rows knitted in No. 3 and electrically connecting the plurality of heater wire knitting rows in parallel, It has a non-knitted drawn bare wire 24 which is drawn as a bare wire from the edge 25 of the heat generating knit in a non-knitted state, and a plurality of feeding electrode bare wires 26 are laid along the edge 25 of the planar heat generating knit. The three edges of the knit, the plurality of non-knitted drawn bare wires 24, and the plurality of bare feed electrode wires 26 are surrounded by threads and pressure-bonded to form the non-knitted bare wire 24. The present invention is characterized by having a parallel wiring circuit in which the plurality of heater wire formation rows are formed by being electrically connected to the power supply electrode bare wire 26.

However, since the above-mentioned sheet heating knit is a knitted product, it is necessary to use a coated heater wire yarn forming the heater wire knitting row, which is extremely flexible, and the edge portion Is a bare wire, and the knitted edge portion, a plurality of non-knitted drawn bare wires, and a plurality of bare wires of the feed electrode are surrounded by threads to bind under pressure, and the structure is extremely complicated. Therefore, there is a problem that the manufacturing process is extremely complicated.

As a similar sheet heating element, there is known a sheet heater having a structure as shown in FIG. 3 described in Japanese Patent Laid-Open No. 114494/1993. Figure 3 (a)
Is a perspective view thereof, and FIG. 3B is an enlarged sectional view of the same.

In this planar heater, ribbon-shaped main electrodes 33 are attached to both sides of a base 31, and a plurality of ribbon-shaped heating elements 35 are arranged in a bridge manner between the main electrodes. It is characterized in that each end of the heating element 35 is attached to the main electrode 33 so as to be able to conduct electricity, and an intermediate portion of each heating element 35 is attached to the base 31.

However, in the above planar heater, the edge portion is thicker than the central portion by the amount of the main electrode 33 and the conductive adhesive layer 34, and the central portion includes the base, the insulating adhesive layer and the heating element. Since it is composed of a sheet-like material, it is a sheet-like material having a relatively large thickness, and there is a problem that each layer must be thinly formed in order to have further flexibility.

[0008]

The above-mentioned sheet heating knit and sheet heater have the above-mentioned problems, and in each case, the heating portions are formed from strip portions which are appropriately spaced, Since they are arranged in a striped pattern, there is a problem in that the heat-generating portion lacks uniformity and causes uneven heat generation.

On the other hand, it is considered that the sheet heating element is made of a woven fabric. However, in the case of weaving the weft yarn by reciprocating the shuttle, the conductive fiber generally composed of the heating element lacks flexibility. However, there is a problem that the weft yarn is easily damaged by the movement of the shuttle, and when the weft yarn is bent at the selvage of the fabric, the weft yarn is easily broken due to the bending.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is that the heater wire is not particularly required to be coated, the thickness is thin and the flexibility is excellent, and there is no heat generation unevenness. It is an object of the present invention to provide a sheet-like heating element made of a woven material that can generate heat extremely uniformly over the entire surface.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is a woven fabric using insulating fibers as warps and fibers comprising heating elements as wefts, wherein the wefts in the central portion in the width direction are in a non-contact state. The weave is woven, and the weft yarn on one side end is woven in contact with the weft yarn woven immediately before, and the weft yarn on the other side end is woven in contact with the weft yarn woven immediately after to form the woven fabric. This is achieved by a sheet-like heating fabric, characterized in that wefts are electrically connected in series over the fabric.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The insulating fiber used in the warp of the present invention is not particularly limited as long as it is a fiber having a substantially insulating property. Can be mentioned. Above all, glass fibers have excellent heat resistance and can be used even at high temperatures.

The fiber comprising the heating element used in the weft of the present invention has an electric resistance capable of generating heat when energized, and is not particularly limited as long as it can be woven. The material and fiber diameter can be appropriately selected according to the purpose of use. As the above weft,
For example, thin and thin metal fibers such as copper wires, nichrome wires, and tungsten wires, conductive synthetic fibers mixed with carbon, glass fibers coated with copper or nickel, carbon fibers, and the like can be given.

The sheet heat-generating fabric of the present invention can be easily and efficiently manufactured by using a generally used loom and appropriately setting the weaving conditions. For example,
Basically, it is a plain weave, and it can be obtained by making the conductive fibers of the heddle be driven twice only at both ends, and setting the movement of the heddle so that the double driving advances alternately right and left. The sheet heat-generating fabric of the present invention is not limited to the plain weave design.

The sheet-like heat-generating fabric of the present invention can be arbitrarily provided with excellent flexibility or to a certain degree of hardness by appropriately setting the fineness of the fibers to be used, the type of material, the woven density and the like. Is possible.

In the sheet-like heat-generating fabric of the present invention, since the wefts are connected in series, the wefts generate heat when the electrodes are connected to the wefts at both ends in the warp direction and electricity is applied thereto. Further, since the weft yarns are uniformly arranged on the entire surface of the woven fabric, the entire surface of the woven fabric is uniformly heated, and uneven heating is not generated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sheet heating fabric of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory plan view showing an embodiment of the sheet heating fabric of the present invention.

The woven fabric shown in the figure has a glass fiber (G
150 1/2 3.8S), a nichrome wire having a fiber diameter of 0.1 mm is used as the weft thread 2, and 30 warp threads / 25
mm, a plain woven fabric composed of wefts at intervals of 40 threads / 25 mm.

The wefts 2 of this woven fabric are woven in such a manner that the wefts on one side in the width direction (A zone in the figure) are in contact with the wefts woven immediately before. Further, the weft yarns on the other side in the width direction (B zone in the drawing) are woven in contact with the weft yarns folded immediately after that. The wefts are woven in a non-contact state in the widthwise central portion (C zone in the figure) of the woven fabric. This woven fabric has 40m in each of A zone and B zone where front and rear wefts are in contact with each other.
The width of the C zone in which the wefts are not in contact with each other is 60 mm.

This sheet-like heat-generating fabric had a thickness of about 1 mm and the thickness of the entire fabric was extremely uniform. When an electric potential was applied to both ends in the warp direction of the sheet-shaped heat-generating fabric to energize the weft, the fabric uniformly and uniformly generated heat.

[0021]

EFFECTS OF THE INVENTION In the sheet heating fabric of the present invention, the heating element is formed by the weft of the fabric, and since the heating points are extremely evenly distributed, there is no uneven heating. Since the sheet-like heat-generating fabric of the present invention is made of a woven fabric, a thin product can be obtained, and a flexible product that can be bent or curved can be obtained. Further, since the whole has an extremely uniform thickness, it is possible to avoid, for example, thickening of both end portions.

The sheet-like heat-generating fabric of the present invention can be embedded in a sheet of rubber or synthetic resin, for example, a sheet suitable for snow removal can be obtained. The embedded sheet-like heat generating fabric acts as a heating element and a reinforcing fiber.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing an embodiment of the sheet heating fabric of the present invention.

FIG. 2A is a partial plan view showing an unfinished product of a conventionally known planar heating knit, and FIG. 2B is a partial plan view showing the completed product.

FIG. 3A is a perspective view showing a conventionally known planar heater, and FIG. 3B is an enlarged sectional view of the same.

[Explanation of symbols]

 1 Warp 2 Weft (conductive fiber) 3a, 3b Lead wire 21 Sheet-like heat generating knit 22 Fiber yarn 23 Heater wire 24 Non-knitted bare wire 25 Edge of sheet-like heating knit 26 Power supply electrode bare wire 27 Sewing thread 28 Surface Edge part of heating knit 31 Base 32 Insulating adhesive layer 33 Main electrode 34 Conductive adhesive layer 35 Heating element

Claims (1)

[Claims] 1. A woven fabric in which insulating fibers are used as warps and conductive fibers are used as wefts, the wefts in the central portion in the width direction are woven in a non-contact state, and the wefts at one side end are immediately Is woven in contact with the weft yarns woven in, and the weft yarns at the other side end are woven in contact with the weft yarns woven immediately after, and the weft yarns constituting the woven fabric are electrically connected in series to the entire woven fabric. The sheet-shaped heat generating fabric characterized by being.