JP2021082456A - Heating element - Google Patents

Abstract

To provide a heating element in which power consumption, excessive heat generation and a short circuit in use are suppressed and which is excellent also in followability.SOLUTION: A heating element 1 includes a heating part body 10, electrodes 30 and a plastic film. The heating part body 10 is formed in an approximately rectangular shape in plan view. The electrodes 30 are arranged at a spacing in the length direction of the heating part body 10. The electrodes 30 of the present embodiment are arranged at a spacing on both ends of the heating part body 10 in the length direction. A projection 13 is provided to each terminal 14. The terminal 14 is connected to a power supply 16 via wiring 15.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heating element.

As the planar heating element, for example, one using carbon composite fiber is known. Since carbon composite fibers have high electrical resistance and require a large amount of electric power, there are concerns about their safety.

Therefore, in Patent Document 1, a cloth provided with a cloth and an electrode portion in which a plurality of loops are formed and entwined in a row with a conductive thread whose core wire surface is coated with a conductive layer (copper, copper alloy, silver, etc.). The heater is disclosed as a heating element. The electrode portion of this heating element is composed of first and second electrode yarns of copper twisted yarns having different thicknesses on the outer periphery of the core wire (synthetic fiber, etc.), and the first electrode yarn and the second electrode yarn are other than the cloth. It is sewn in the direction.

International Publication No. 2013/085051

However, the heating element described in Patent Document 1 has problems such as excessive heat generation and temperature unevenness because the conductive portion of the electrode portion is copper and the electrical resistance is different from that of silver which is the conductive portion of the fabric. In addition, it is necessary to avoid excessive fever because excessive fever may induce the occurrence of shorts.

The above problems lead to, for example, when the heating element is used as a supporter in direct contact with the skin, the skin is burned, the required temperature is not reached, and the function cannot be performed.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a heating element which suppresses power consumption, excessive heat generation, temperature unevenness, and short circuit during use, and has excellent followability. And.

According to the first aspect of the present invention, there is a space between a heating element main body having a woven fabric or knitted fabric containing a conductive thread coated with a conductive metal and the heating element main body in a direction along the conductive thread. Provided is an electrode portion that includes the material having the conductive metal, and a heating element that includes.

Further, in the heating element according to one aspect of the present invention, the electrode portion is formed in a region where fine particles of the conductive metal are arranged in the heat generating portion main body.

Further, in the heating element according to one aspect of the present invention, the electrode portion is a woven fabric or knitted fabric containing a conductive yarn coated with the conductive metal and arranged along a direction intersecting the direction along the conductive yarn. Is.

Further, in the heating element according to one aspect of the present invention, the electrode portion is a foil formed of the conductive metal and arranged along a direction intersecting the direction along the conductive thread.

Further, in the heating element according to one aspect of the present invention, at least one of the heat generating portion main body and the electrode portion has the knitted fabric.

Further, in the heating element according to one aspect of the present invention, the knitted fabric is formed by warp knitting.

Further, in the heating element according to one aspect of the present invention, a plastic film is laminated on at least one surface of the heat generating portion main body.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a heating element having excellent followability by suppressing power consumption, excessive heat generation, temperature unevenness, and short circuit during use.

It is a schematic plan view which shows the heating element of this embodiment. It is a front view in FIG. It is a figure which partially shows the structure of an example of the warp knitting which forms the heat generating part main body 10.

Hereinafter, embodiments of the heating element of the present invention will be described with reference to FIGS. 1 to 3.
It should be noted that the following embodiments show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.

FIG. 1 is a schematic plan view showing a heating element of the present embodiment. FIG. 2 is a front view of FIG.

As shown in FIG. 1, the heating element 1 includes a heat generating portion main body 10, an electrode portion 30, and a plastic film 40 (not shown in FIG. 1). The heat generating portion main body 10 is formed in a substantially rectangular shape in a plan view. The electrode portions 30 are arranged at intervals in the length direction of the heat generating portion main body 10. The electrode portions 30 of the present embodiment are arranged at both ends of the heat generating portion main body 10 in the length direction at intervals.

In the following description, the direction is along the conductive thread of the heat generating portion main body, which will be described later, and the direction in which the electrode portion 30 is arranged with respect to the heat generating portion main body 10 is the X direction, which is the direction along the conductive thread. The intersecting directions, the direction orthogonal to the X direction is defined as the Y direction, and the thickness direction of the heat generating portion main body 10 orthogonal to the X direction and the Y direction is appropriately described as the Z direction.

The heat generating portion main body 10 extends toward the + Y side from each of the rectangular portion 11 located on the −Y side of the center in the Y direction and both ends of the rectangular portion 11 in the X direction, and then bends toward the center side in the X direction and bends in the X direction. It has a bent portion 12 extending toward the surface and a protruding portion 13 extending from the tip of the bent portion 12 to the + Y side. The bent portion 12 extending in the X direction is arranged with a gap from the rectangular portion 11. Further, the tips of the bent portions 12 and the protrusions 13 are arranged with a gap.

Each protrusion 13 is provided with a terminal 14. The terminal 14 is connected to the power supply 16 via the wiring 15. As the power supply 16, either a DC power supply or an AC power supply can be used. When a DC power supply is used, the power supply 16 can output a voltage of DC 1.5 V or more and DC 25 V or less. In this case, examples of the power supply 16 include a DC 1.5V dry battery, a lithium polymer battery, a lithium battery, and a solid lithium battery. Further, the power supply 16 uses a constant voltage device that converts an AC power supply of AC100V or AC200V into a DC current of, for example, DC1.5V or more and DC25V or less by an AC / DC adapter, and outputs the converted DC current. You can also. When the heating element 1 is used as a supporter or the like, the power supply 16 is preferably a DC power supply (battery) from the viewpoint of portability.
The temperature setting of the heat generating part main body is not particularly specified, but it is desirable to set it between 20 ° C. and 100 ° C. In this case, the temperature of the electrode portion is preferably lower than the temperature of the main body of the heat generating portion or 20 ° C. or less with respect to the temperature of the main body of the heat generating portion.

The heat generating portion main body 10 is made of a woven fabric or a knitted fabric. A woven fabric is constructed by weaving threads that extend linearly in the vertical direction and threads that extend linearly in the horizontal direction at right angles. A knitted fabric is formed by connecting a plurality of loops with threads and regularly entwining the loops. The heat generating portion main body 10 of the present embodiment is preferably a knitted material from the viewpoint of elasticity. Further, as the heat generating portion main body 10 of the present embodiment, from the viewpoint that the temperature rises too much if the expansion and contraction is too large, the loop is knitted while advancing in the vertical direction rather than the weft knitting in which the loop is produced in the horizontal direction. It is preferable that the warp knitting is used to make the ground.

FIG. 3 is a diagram partially showing the structure of an example of a warp knit that forms the heat generating portion main body 10. As shown in FIG. 3, the threads shown by the solid line are the dyeable threads 61, 63, 65 supplied by the same reed, and the threads shown by the solid line are the dyeable threads 62, supplied by the other same reed. It is 64,66, and the dyeable yarns 61, 63, 65 are knitted mirror-symmetrically with the dyeable yarns 62, 64, 66 to form a net warp knitted fabric. The threads shown by the thick solid lines are the conductive threads 71, 73, 75 supplied by the same reed, and the threads shown by the thick broken lines are the conductive threads 72, 74, 76 supplied by the other same reeds, and the conductive threads 71. , 73, 75 are inserted into a net warp knitted fabric knitted with dyeable yarn together with conductive yarns 72, 74, 76.

In FIG. 3, a group of conductive yarns 71, 73, 75 intersects with conductive yarns 72, 74, 76 of another group in a warp knitted fabric. As described above, since the surface of the conductive yarn is coated with metal, substantially all the conductive yarns in the warp knitted fabric are electrically operated by arranging the conductive yarns along the X direction while intersecting the adjacent conductive yarns. Will be connected. As a result, even if one of the conductive threads is broken, it is possible to suppress excessive heat generation and temperature unevenness without heating at a specific position in the Y direction.

The conductive threads 71 to 76 are composed of, for example, a core wire made of fibers and a conductive layer (conductive substance) that covers the surface of the core wire. The conductive layer is formed of, for example, a metal such as gold, silver, copper, zinc, lead, tin, aluminum, or iron. The conductive layer can be formed by, for example, thin-film deposition, plating, or the like, depending on the metal used. That is, the conductive threads 71 to 76 are plated threads. The metal forming the conductive layer is preferably silver, copper, gold, or iron, and more preferably silver or copper, in consideration of cost, hypersensitivity reaction to a living body, and low electrical resistance.

Examples of the core wire include polyamide fiber, polyester fiber, polyurethane fiber, nylon fiber, acrylic fiber, vinylon fiber, polyethylene fiber, and polyvinyl chloride fiber. Various synthetic fibers such as polypropylene fibers, various semi-synthetic fibers such as acetate fibers and polylactic acid fibers, various natural fibers such as cotton and hemp, and various recycled fibers such as rayon can be used. As for the thickness of the conductive yarns 71 to 76, in the case of silver-plated yarn, monofilaments or multifilaments of about 10d to 110d are used, and the silver content in the case of this seed yarn is 10% to 50% in terms of weight.

The electrode portions 30 are formed at both ends of the rectangular portion 11 in the heat generating portion main body 10 in the X direction, the bent portion 12 and the protrusion portion 13. As shown in FIGS. 1 and 2, the electrode portion 30 is a metal fine particle layer 31 provided on both ends of the heat generating portion main body 10 and the + Z side surface 10a of the heat generating portion main body 10 as a material having a conductive metal. have. The metal fine particle layer 31 is formed in a region where the conductive metal is arranged on the heat generating portion main body 10. The method for forming the metal fine particle layer 31 is not particularly limited, and various printing methods such as screen printing using ink containing metal fine particles, offset printing, and inkjet printing can be selected.

As the metal fine particles forming the metal fine particle layer 31, fine particles of the same metal as the metal forming the conductive layer of the conductive threads 71 to 76 are selected. In this embodiment, as described above, silver fine particles are used in consideration of cost and hypersensitivity reaction to a living body. More specifically, the fine particles are nano-silver particles having a silver particle size on the order of nanometers (0.01 to 50 micrometers).

The fine particles shown in the present embodiment refer to fine particles having an average particle size of 0.01 to 50 micrometers as measured by a dynamic (static) light scattering measuring device without any limitation on the shape or the like.
The average particle size of the fine particles is preferably 0.01 to 50 micrometers, more preferably 0.5 to 50 micrometers, and even more preferably 1 to 20 micrometers.
Examples of the method for measuring the particle size of the fine particles include CGS-3 manufactured by ALV of Germany and SAXSess mc2 manufactured by Antonio Par.

In the electrode portion 30 in which the metal fine particle layer 31 is laminated on the heat generating portion main body 10, it functions as a linear conductor by an aggregate of fine metal fine particles arranged densely. Further, when the metal fine particles adhere to the conductive thread, the conductive thread of the heat generating portion main body 10 and the metal fine particle layer 31 are electrically connected.

As shown in FIG. 2, the plastic film 40 is laminated on the surface 10b on the −Z side of the heat generating portion main body 10. The plastic film 40 may be laminated on both sides of the heat generating portion main body 10 in the Z direction. The plastic film 40 is formed of, for example, an elastomer such as polyester, polyurethane, or polyolefin in order to maintain the elasticity of the heat generating portion main body 10.

The heating element 1 having the above configuration is, for example, mounted on the inside of a blanket or the like, mounted on a seating surface of a chair, mounted on underwear or footwear, or at least a part of a supporter, other equipment or materials, and water associated therewith. It can be widely used for heat retention, etc.

The heating element 1 having the above configuration is supplied with power from the power supply 16 via the wiring 15, the terminal 14, and the electrode portion 30, so that the conductive threads 71 to 76 are energized and the heating unit main body 10 generates heat.

In the heating element 1 of the present embodiment, the metal forming the conductive layer of the conductive threads 71 to 76 in the heating unit main body 10 and the metal forming the electrode portion 30 (metal fine particle layer 31) are formed of the same metal. Therefore, the difference in electrical resistance between the heat generating portion main body and the electrode portion becomes small, the risk of excessive heat generation and short circuit of the electrode portion 30 can be suppressed, and the safety can be enhanced. Further, in the heating element 1 of the present embodiment, since the difference in electrical resistance between the heating unit main body 10 and the electrode portion 30 is small, it is possible to suppress the occurrence of excessive heat generation and temperature unevenness. Deterioration due to sweat, water, and activator due to repeated use and washing is suppressed, and it can be uniformly heated at a constant temperature for a long period of time.

Further, in the heating element 1 of the present embodiment, since the conductive portion of the heating portion main body 10 and the electrode portion 30 is made of metal and the electric resistance is small, for example, the power required to generate heat at 40 ° C. is reduced, and the power consumption is reduced. Can be suppressed. In particular, in the heating element 1 of the present embodiment, if silver is used as the conductive metal, the power consumption can be further suppressed. In addition, in the heating element 1 of the present embodiment, if the metal fine particle layer 31 is provided as the electrode portion 30, the electric resistance is reduced, so that excessive heat generation of the electrode portion 30 can be suppressed and the occurrence of temperature unevenness can be further suppressed. It will be possible.

Further, in the heating element 1 of the present embodiment, when the heating element main body 10 is formed of a warp knit, the shrinkage due to washing or repeated use is smaller than that of a weft knit, so that the shrinkage accompanies the shrinkage. Therefore, it is possible to suppress the temperature rise of the heating element 1 and also to suppress the temperature change due to the deformation of the woven fabric.

Further, in the heating element 1 of the present embodiment, when the plastic film 40 is laminated on one surface of the heating element main body 10, the conductive threads 71 to 76 and the electrode portion 30 are deteriorated while maintaining the elasticity of the heating element main body 10. Is suppressed, and a heating element 1 that generates heat stably even after washing or repeated use can be obtained. Also. The risk of short circuit due to deterioration can also be suppressed.

[Example]
Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples, and can be appropriately modified and carried out without departing from the gist thereof.

(Examples 1 to 6, Comparative Examples 1 to 2)
The heating elements of Examples 1 to 6 and Comparative Examples 1 and 2 were prepared according to the specifications shown in [Table 1] below.
Specifically, in Examples 1 to 6 and Comparative Example 2, the heat generating portion main body in which the conductive thread was silver-plated thread was used. For Comparative Example 1, a heat generating portion main body in which the conductive thread was a carbon composite fiber was used. Further, in Examples 1 to 4, a heat generating portion main body whose knitting method is warp knitting was used. For Example 5 and Comparative Example 1, a heat generating portion main body, which is a woven fabric, was used. In Example 6 and Comparative Example 2, a heat generating portion main body whose knitting method was weft was used. Then, in Example 1, the surface of the core wire was an electrode portion formed of a silver conductive thread coated with silver. In Examples 2 to 3, 5 to 6 and Comparative Example 1, an electrode portion formed of a silver conductive thread and a silver fine particle layer was used. In Example 4, an electrode portion formed of a silver fine particle layer was used. In Comparative Example 2, the surface of the core wire was an electrode portion formed of a copper conductive thread coated with copper. In Examples 3 to 6, a heating element in which a plastic film was laminated on one surface was used. In Examples 1 and 2 and Comparative Examples 1 and 2, a heating element in which a plastic film was not laminated on one surface was used.

In the above heating element, the silver conductive thread used for the heat generating part main body and the electrode part is Sylbern ZAG (registered trademark) silver ion fiber, and the copper conductive thread is 33 copper wires of 50 microns plated with nickel. A conductive thread wound around a decitex aramid fiber was used. The average particle size of the silver fine particle layer was 1 to 5 micrometers, and no other conductive substance was blended, and a plastic resin was contained in order to give the coating film elasticity. The plastic film made of polyester and having a thickness of 50 μm was used. The plastic film was laminated on the heat generating portion main body and the electrode portion by laminating.

[Evaluation method]
Each heating element of Examples 1 to 6 and Comparative Example 1 used a heating element main body having a size of about 10 cm × about 20 cm, and Comparative Example 2 having a size of about 8 cm × about 13 cm.

For each of the above heating elements, the heating unit main body was energized at 7 V. Divided by a line passing through the center of each side of the heat generating part main body and divided into four to a size of about 5 cm × about 10 cm (Comparative Example 2 is about 4 cm × about 6.5 cm), the maximum temperature and the minimum temperature of each of the four parts Intermediate temperature calculated from ((maximum temperature + minimum temperature) / 2, rounded to the second digit of the decimal point), intermediate temperature of 4 parts of the heat generating part body and intermediate temperature of each intermediate temperature of 2 electrode parts, totaling 6 parts Evaluation of the difference, the difference in the intermediate temperature due to repeated use / washing, the presence / absence of energization failure due to disconnection, the temperature change in the intermediate temperature of the heat generating part body due to repeated use / washing, and the flexibility of the knee flexion part by the person in charge. did.
Each of the above temperatures was measured with a FLIR C2 compact thermofluffy, and the maximum and minimum temperatures were confirmed and used for evaluation. As for the intermediate temperature of the electrode portion (+ portion and − portion, respectively), the maximum temperature and the minimum temperature of the electrode portion were measured from the thermography, and the average value of the temperatures at the above two points was taken as the intermediate temperature of the electrode portion.

The evaluation of whether the heat generating part main body can generate heat to 40 ° C. at 7V is "○" when all the intermediate temperatures of the above four parts can generate heat to 40 ° C. when the heating unit main body is energized at 7V. (OK) was set, and the case where heat was not generated up to 40 ° C at 7 V was set as "x" (NG).

The presence or absence of excessive heat generation (presence or absence of temperature unevenness) was evaluated based on whether or not the difference in intermediate temperature between the four parts of the heat generating part main body and the two parts of the electrode part, a total of six parts, was within 20 ° C. The case where the difference between the maximum temperature and the minimum temperature among the intermediate temperatures of the six parts was within 20 ° C. was evaluated as “◯” (OK), and the case where the difference exceeded 20 ° C. was evaluated as “x” (NG).

For evaluation of excessive heat generation (temperature unevenness) and poor energization due to repeated use and washing, the cycle of energization for 1 hour (7V), washing with laundry detergent in the washing machine, and drying is repeated 6 times, and the total is the same as above. The difference in intermediate temperature at 6 sites was evaluated. "×" (NG) when the difference between the maximum temperature and the minimum temperature among the intermediate temperatures of the 6 parts exceeds 20 ° C, and "△" (No) when there is no heat generation (because the wire is broken). Bad). The heating element of Comparative Example 1 in which all the intermediate temperatures of the four parts of the heating unit main body did not generate heat at 40 ° C. was not evaluated.

In the evaluation of the heat generation temperature change of the heat generating part main body due to repeated use and washing, the difference between the initial intermediate temperature (6 times repeated use and before washing) and the intermediate temperature after the above test is all 4 parts for each of the 4 parts of the heat generating part main body. The case of 2 ° C. or lower was rated as “◯” (OK), and the case where the difference in intermediate temperature exceeded 2 ° C. at even one of the four sites was rated as Δ (No Bad). The heating elements of Comparative Example 2 in which excessive heat generation was generated due to repeated use and washing and Example 4 in which poor energization occurred were not evaluated.

The flexibility at the bent part was evaluated. For the evaluation of flexibility, 3 persons in charge (adults) mounted each heating element in a cylindrical knee supporter (auxiliary holder of "Knee Hoton" manufactured by Kiribai Chemical Co., Ltd.) and performed 10 bending and stretching exercises. After going around, 3 points were given when they felt flexible, 2 points were given when they felt a little flexible, and 1 point was given when they felt inflexible. The average value was calculated with the last digit of the decimal. 2.5 to 3 points were designated as "○" (OK), 1.5 to 2.4 were designated as Δ (No Bad), and 1.4 or less were designated as "x" (NG).

A supporter is a support that supports human movable parts (knees, elbows, necks, ankles, shoulders, wrists, hips, hip joints and their surroundings). As the supporter, a supporter having a structure in which a heating element can be incorporated into the movable part of the human is preferable. As the supporter, a structure formed in a cylindrical shape or a structure formed in a tubular shape by connecting the ends of at least one plane body can be adopted. As the material of the supporter, for example, power net material, soft pile material, double Russell material, single Russell material, mesh material and its combination, circular knit fabric, etc., which have elasticity and flexibility and are attached to humans. It is not particularly limited as long as it is possible to stabilize the movable part (joint part, etc.) of a human by applying pressure to the body. Further, an elastomer foam may be formed for cushioning and heat retaining effects.

As shown in [Table 1], in the heating elements of Examples 1 to 6 in which the conductive thread of the heat generating portion main body and the conductive layer of the electrode portion are made of the same metal, the power for the heating unit main body to generate heat at 40 ° C. A good evaluation was obtained for the difference in heat generation temperature between the heat generating part main body and the electrode part. That is, in the heating elements of Examples 1 to 6, power consumption, excessive heat generation, and temperature unevenness could be suppressed. Further, it is presumed that the heating elements of Examples 1 to 6 in which the conductive thread of the main body of the heat generating portion and the conductive layer of the electrode portion are made of the same metal can suppress excessive heat generation and short circuit during use because the difference in electrical resistance is small. it can.

On the other hand, in the heating element of Comparative Example 1 in which the conductive thread of the heat generating portion main body and the conductive layer of the electrode portion are different metals, a good evaluation cannot be obtained with the electric power for the heating unit main body to generate heat at 40 ° C. Further, in Comparative Example 2, a good evaluation could not be obtained due to excessive heat generation (temperature unevenness). Therefore, when the conductive layer of the conductive thread and the conductive layer of the electrode portion are made of different metals, at least one of power consumption and excessive heat generation (temperature unevenness) cannot be suppressed.

Further, in the heating elements of Examples 1 to 3 to 5-6 in which the electrode portion was formed of the silver conductive thread and the silver fine particle layer, good evaluation was obtained regarding excessive heat generation and poor energization of the electrode portion due to repeated use and washing. It was.

Further, in the heating elements of Examples 1 to 3 in which the method of knitting the heating element main body is warp knitting, a good evaluation was obtained that the heating temperature change of the heating element main body due to repeated use and washing was 2 ° C. or less. On the other hand, in the heating element of Example 5 which is a woven fabric and the heating element of Example 6 in which the knitting method is weft knitting, the heat generation temperature change of the heat generating portion main body was evaluated to be less than 2 ° C. Therefore, by using a warp knitting method for the main body of the heat generating portion, it was possible to suppress a temperature change of the main body of the heat generating portion due to repeated use and washing.

Further, in the heating elements of Examples 1 to 4, Example 6 and Comparative Example 2 of the knitted fabric in which the conductive yarn was silver-plated yarn, a good evaluation was obtained in terms of flexibility. Further, the heating element of Example 5, which is a woven fabric, showed flexibility, although it was inferior to that of Examples 1 to 4.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above examples. The various shapes and combinations of the constituent members shown in the above-mentioned examples are examples, and can be variously changed based on design requirements and the like within a range that does not deviate from the gist of the present invention.

For example, in the above embodiment, the configuration in which the heat generating portion main body 10 is formed of a warp knitted fabric is illustrated, but the configuration is not limited to this configuration, and for example, a configuration formed of a weft knitted fabric may be used. Good. Further, the heat generating portion main body 10 may be a woven fabric instead of a knitted fabric. When the heat generating portion main body 10 is a woven fabric, either one of the yarn extending linearly in the vertical direction and the yarn extending linearly in the horizontal direction is a conductive yarn, and the above-mentioned electrode portions are provided on both ends of the conductive yarn. Just do it.

Further, in the above embodiment, the configuration in which the electrode portion has at least one of the conductive thread and the metal fine particle layer is illustrated, but the present invention is not limited to this configuration, and for example, it is formed of a conductive metal and along the direction intersecting with the conductive thread. It may be formed of foil arranged in a row. Even when this configuration is adopted, the same actions and effects as those of the above embodiment can be obtained.

1 ... Heating element, 10 ... Heat generating part body, 30 ... Electrode part, 40 ... Plastic film, 71, 72, 73, 74, 75, 76 ... Conductive thread

Claims (7)

A heat-generating part body having a woven fabric or knitted fabric containing a conductive yarn coated with a conductive metal,
In the heat generating portion main body, an electrode portion provided at intervals in the direction along the conductive thread and containing a material having the conductive metal, and an electrode portion.
A heating element characterized by containing. The electrode portion is formed in a region where fine particles of the conductive metal are arranged on the main body of the heat generating portion.
The heating element according to claim 1. The electrode portion is a woven fabric or knitted fabric containing a conductive yarn coated with the conductive metal and arranged along a direction intersecting the direction along the conductive yarn.
The heating element according to claim 1. The electrode portion is a foil formed of the conductive metal and arranged along a direction intersecting a direction along the conductive thread.
The heating element according to claim 1. At least one of the heat generating portion main body and the electrode portion has the knitted fabric.
The heating element according to any one of claims 1 to 4. The knit is formed by warp knitting,
The heating element according to claim 5. A plastic film is laminated on at least one surface of the heat generating portion main body.
The heating element according to any one of claims 1 to 6.

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