KR102318691B1 - Flexible heating sheet using fabric electrode - Google Patents

Abstract

The present invention relates to a flexible heating sheet using a fiber electrode, and more specifically, it is possible to ensure sufficient conductivity of the thin film electrode, and the thin film electrode is not easily peeled off even by repeated bending or bending, or repeated heating and cooling. In order to improve durability, a heating layer 20 capable of generating heat when energized is disposed on the base substrate 10 of a thin film having flexibility and heat resistance, and an electrode connected to the heating layer 20 to apply electricity. In the flexible heating sheet containing A heating sheet is provided.

Description

Flexible heating sheet using fiber electrode {FLEXIBLE HEATING SHEET USING FABRIC ELECTRODE}

The present invention relates to a flexible heating sheet using a fiber electrode, and more specifically, by forming a heating paste and a conductive paste in a predetermined pattern on a flexible thin film, respectively, and then attaching a conductive fiber electrode on the conductive paste. It relates to a flexible heating sheet using a fiber electrode that maximizes conductivity and durability while being flexible.

In general, a flexible heating sheet is formed by printing a conductive carbon paste in a predetermined pattern to form a heating layer on a polyethyleneterephthalate (PET) film having heat resistance and insulation, and a metal such as a thin copper plate to apply electricity to the heating layer. It is manufactured by thermocompression bonding the PET film again after the electrode is inserted in a structure in which the electrode is placed on top of the material at the bottom rather than being adhered to it. It is applied in various fields such as

As an example related to this technology, in Korean Patent Laid-Open No. 10-2011-0104247, a conductive carbon black paste is screen-printed on the surface of a TPU sheet to form a heating part, and conductive silver powder is screen-printed on both ends of the heating part to form a conductive part (conductive layer). ), and then attaching a silver piece on the conductive part (conductive layer) to form a terminal part, connecting an electric wire to the end of the terminal part, and forming a laminated part on the TPU sheet (Patent Document 1) has been proposed

However, as in Patent Document 1, in the case of an electrode in which a silver piece or a thin metal plate such as copper or aluminum is attached on a conductive part (conductive layer) formed by printing a conductive paste such as silver powder, the heat between the conductive part (conductive layer) and the thin metal plate electrode Various problems occur according to the difference in the coefficient of contraction and expansion.

In other words, the flexible heating sheet is bent, heated and cooled repeatedly during its use, but the conductive part (conductive layer) printed with paste (silver powder) and the thin metal electrode have a difference in the amount of expansion and contraction due to heat. Alternatively, the whole is lifted or voids are generated, so that conductivity is not good, and furthermore, an arc (spark) phenomenon occurs in the void-generating portion, thereby implying a risk of fire.

In order to solve this problem, some form the electrode in a structure in which the paste-printed conductive part and the thin metal electrode are placed on top of each other without attaching them to each other. As the bending or bending of the electrode occurs due to an external physical action, there is no circular restoring force due to the characteristics of the thin metal electrode, so a gap is formed by the separation between the two electrodes, and an arc (spark) phenomenon occurs as described above.

Moreover, since the structure in which the two electrodes face each other has a weak adhesion between each element, when the incoming voltage is low or a DC power supply is used, the vertical (vertical) conduction between each electrode layer is insufficient, resulting in loss of heating ability and a serious problem in terms of electrical safety. causes

Therefore, in some cases, a thin metal plate electrode is excluded and an electrode for electricity is formed only by printing a conductive paste. , it is impossible to apply to a large heating sheet because the heating temperature deviation per distance of the heating layer is severe, and it is difficult to apply it to a small heating element as well.

In addition, when the paste electrode layer is damaged due to cracks, scratches, oxidation, etc., there is a problem that heat generation ability is lowered as well as a risk of fire.

On the other hand, in the Republic of Korea Patent No. 10-0641693 (Patent Document 2) as an example of the prior art for maximizing flexibility, in the planar heating element having a fabric-type heating part in which a fiber yarn is woven as a weft and warp, the fabric type A pair of conductive parts for power application on one side of the heating part are woven at a predetermined interval in plain weave, and the pair of conductive parts are woven in a plurality of rows with a plurality of electrode yarns and are provided in the warp direction, and the heating yarns woven in multiple rows at a predetermined interval are woven with a weft yarn. Doedoe intersecting and interwoven with the pair of conductive parts and woven so as to be able to conduct electricity, the heating yarn is interwoven with the fiber yarns in a zigzag shape at regular intervals on the flat fabric on the other side of the pair of conductive parts and woven, and one end of the heating yarn part is interwoven and woven with one conductive part of the pair of conductive parts, and the other end of the heating yarn is non-woven more than the width of the one conductive part to achieve an electrical non-connection relationship with the one conductive part A planar heating element has been proposed with a jumping jumping part.

The heating element as in Patent Document 2 has excellent flexibility because both the heating part and the conductive part are woven in the form of a fabric. It is a structure in which the and conductive parts are placed on top of each other without attaching the adhesive force to each other, so this electrode structure also causes voids due to separation when bending or bending due to contraction and expansion due to heat or physical force, resulting in arc (spark) In addition, when the voltage is lowered or there is no adhesion between the heating part and the conductive part when the DC power is used, the amount of current is reduced and the heating ability is lost.

1. Republic of Korea Patent Publication No. 10-2011-0104247 (published on September 22, 2011) 2. Republic of Korea Patent No. 10-0641693 (published on November 8, 2006)

The present invention for solving the problems inherent in the above prior art can ensure sufficient conductivity of the thin film electrode, and also prevent the thin film electrode from being easily peeled off even by repeated bending or bending, or repeated heating and cooling. , It is possible to improve durability by protecting the heating layer and/or conductive layer in the form of paste to prevent cracks, scratches, oxidation, etc. An object of the present invention is to provide a flexible heating sheet used.

In a flexible heating sheet using a fiber electrode of the present invention for achieving the above object, a heating layer capable of generating heat when energized is disposed on a base substrate of a thin film having flexibility and heat resistance, and an electrode connected to the heating layer to apply electricity In the flexible heating sheet comprising a, the electrode is made of a conductive fiber electrode manufactured in the form of cotton using a conductive yarn, characterized in that the conductive fiber electrode is in contact with the surface of the heating layer.

In this case, the heating layer may be formed by printing a heating paste on the base substrate, and a pair of conductive fiber electrodes may be in surface contact with each other at different portions of the heating layer.

In another aspect, in the flexible heating sheet using the fiber electrode of the present invention, a heating layer capable of generating heat when electricity is supplied to a thin film base substrate having flexibility and heat resistance and a conductive layer connected to the heating layer are respectively disposed, and electricity is applied to the conductive layer It further comprises a thin film electrode for applying, wherein the thin film electrode is made of a conductive fiber electrode made of a cotton form such as a woven fabric or knitted fabric or nonwoven fabric woven with a conductive yarn, and the fiber electrode is applied on the conductive layer via a conductive adhesive It is characterized in that the surfaces are in contact with each other to enable mutual conduction by attaching them.

At this time, the heating layer is made by printing a heating paste on the base substrate, and the conductive layer is made by printing a conductive paste on the base substrate. A pair of silver may be in surface contact with each of the conductive layers.

As a preferred embodiment, the thickness of the conductive fiber electrode is characterized in that 0.001 ~ 0.5mm.

In addition, when the conductive fiber electrode is in the form of a fabric, the number of threads per 1 inch each in width and length is 10 to 2500.

In addition. The conductive fiber electrode is characterized in that the surface is attached via a conductive adhesive or a conductive adhesive.

According to the flexible heating sheet using the fiber electrode of the present invention, the conductive fiber electrode having a predetermined area on the conductive layer having a predetermined area is in surface contact (attached) through the mutual conductive adhesive, so that conductivity can be improved, and the conductivity can be improved to a certain degree. Through the flexible fiber electrode, the surface contact part is not easily lifted or separated under any conditions or environment, such as repeated bending and repeated heating and cooling, so that the electrical safety and heat durability of the heating element can be improved. It can maintain the original thermal performance as it is.

Accordingly, it is possible to apply a low-voltage direct current stably in addition to applying a commercial alternating current, so that it can be applied to a portable heating element, and it is possible to apply a direct current to a large heating element wider than before, including a small heating element. Thus, it has the advantage of having versatility that can be applied to various heating products, and it is possible to mass-produce a DC heating element, which was not possible before, through a roll-to-roll process, which makes it possible to provide a heating element of more stable quality at a lower price. have effects such as

1 is a plan view of a heating sheet according to an embodiment of the present invention.
Figure 2 is an enlarged cross-sectional view taken along line AA of Figure 1;
3 is a real photograph of a conductive fiber electrode in a heating sheet according to an embodiment of the present invention.
4 is a structural diagram of a conductive fiber electrode in a heating sheet according to an embodiment of the present invention.
5 is a real photograph of a state in which unspecified points are freely refracted to show the flexibility of the heating sheet according to an embodiment of the present invention.

Since the present invention can have various modifications and can have various embodiments, preferred embodiments of the present invention will be exemplified below, and the present invention will be described in detail based thereon. However, this is not intended to limit the present invention to only the illustrated embodiments, and the spirit and scope of the present invention includes ordinary modifications or equivalents to substitutes of the illustrated forms.

In addition, throughout the specification, that a part is 'connected' to another part includes a case in which it is 'directly connected' or 'indirectly connected' with an element, and 'includes' a certain element is specifically opposite. Unless otherwise stated, it means that other components may be added, rather than excluding other components.

1 is a plan view of a heating sheet according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a real photograph of a conductive fiber electrode in a heating sheet according to an embodiment of the present invention. , FIG. 4 is a structure of a conductive fiber electrode in a heating sheet according to an embodiment of the present invention, and FIG. 5 is a real photograph of a state in which unspecified points are freely refracted to show the flexibility of the heating sheet according to an embodiment of the present invention. .

1 and 2 , the flexible heating sheet of the present invention is largely configured to include a base substrate 10 , a heating layer 20 , a conductive layer 30 , and a conductive fiber electrode 40 .

The base substrate 10 is in the form of a thin film having flexibility and heat resistance, and may be a known PET film or TPU film as an example of the material, and may also be a synthetic resin film, fiber, nonwoven fabric, paper, etc. In addition, as long as it has flexibility and heat resistance, there is no limitation on the material, material, and shape.

The heating layer 20 is a paste or ink-like material having a characteristic that generates heat by itself when electricity is applied, such as conductive carbon paste, in various methods such as screen printing, gravure printing, etching, offset, photogravure, impregnation, coating, etc. is formed in a predetermined area and a predetermined pattern with respect to the surface of the base substrate 10 through the

The conductive layer 30 is in contact with the heating layer 20 to allow electricity to pass through, and a paste containing a conductive metal powder such as gold, silver, or copper is applied by screen printing, gravure printing, etching, offset, photogravi, It is formed in a predetermined area and a predetermined pattern with respect to the surface of the base substrate 10 through various methods such as impregnation and coating, in which case the conductive layer 30 is electrically separated as a pair, and each conductive layer Reference numeral 30 has an electrode function for applying electricity to the heating layer 20 by being connected to different portions of the heating layer 20 .

The conductive fiber electrode 40 is a nonwoven fabric by weaving a conductive yarn in the form of a thread having electrical conductivity in a known manner such as weaving or knitting, or binding the fiber aggregate through a mechanical, chemical or heat treatment process. , and a pair of electrically separated conductive fiber electrodes 40 in the form of a surface are attached to the conductive layer 30, respectively. In this case, the conductive fiber electrode 40 may be manufactured in the form of a surface having a predetermined area, and may be surface-bonded to the surface of the conductive layer 30 to enable vertical and vertical current through the conductive adhesive 41 or the pressure-sensitive adhesive.

3 and 4, the conductive fiber electrode 40 may be manufactured in the form of a band having a predetermined width and a predetermined length, and a conductive adhesive 41 is applied to one side of the conductive fiber electrode 40. After application, a release paper 42 may be adhered to the surface of the conductive adhesive 41 to form a kind of tape.

The conductive adhesive 41 is a general term for a conductive adhesive or adhesive composition, and has conductivity because conductive powder is mixed in the composition and has heat resistance. Since it is known in a number of patent documents such as No. 0001014, a detailed description thereof will be omitted.

In the present invention, in order to provide flexibility to the conductive fiber electrode 40, the thickness of the conductive fiber electrode 40 is preferably manufactured in a range of 0.1 to 0.2 mm. Of course, in order to further maximize the flexibility of the conductive fiber electrode 40, the minimum thickness may be reduced to 0.001 mm, and the maximum thickness may be increased to 0.5 mm within a range that does not impair the flexibility.

It is not easy to make the thickness of the conductive fiber electrode 40 less than 0.001 mm through weaving, knitting, or non-woven fabric manufacturing method such as a woven fabric, and conversely, if it is manufactured to 0.5 mm or more, flexibility is lowered, so the purpose of the present invention is That is, it does not meet the purpose of providing a flexible heating sheet.

3 is an actual photograph of the conductive fiber electrode 40, the thickness of which is 0.14 mm, and as a result of manufacturing a flexible heating sheet using the conductive fiber electrode 40 of this thickness, unlike the general metal thin film electrode, FIG. As such, sufficient flexibility was ensured, and even when heating and cooling were repeated by energization, there was no separation between the conductive layer and the fiber electrode, confirming the stable power supply.

Therefore, as described above, the thickness of the conductive fiber electrode 40 is preferably manufactured within the range of 0.1 to 0.2 mm when simultaneously considering the ease of manufacturing the conductive fiber electrode 40, sufficient electricity supply, and securing flexibility.

On the other hand, when the conductive fiber electrode 40 is in surface contact with the conductive layer 30, it is possible to sufficiently ensure vertical and vertical conductivity between the two elements, and at the same time, it is important to maximize the contact area between the two elements, so that the conductive fiber It is necessary to consider the density of the electrode 40 .

However, the density of the conductive fiber electrode 40 does not need to be considered when manufacturing in the above-mentioned nonwoven form, but needs to be considered because it affects adhesion with the conductive layer when weaving in a weaving manner.

The density of the conductive fiber electrode 40 manufactured by the weaving method may be expressed by, for example, the number of warp and weft threads within 1 inch in width and length.

In the present invention, the number of threads per 1 inch in width and length of the conductive fiber electrode 40 can be manufactured in the range of 10 to 2500, and as described above, the preferred thickness (0.1 to 0.2) of the conductive fiber electrode 40 mm), the density of the conductive fiber electrode 40 may be 100 to 260.

If the density of the conductive fiber electrode 40 is 10 or less, the conductivity and adhesiveness with the conductive layer 30 decrease because the density is low, and if it is 2500 or more, it is not preferable because the process such as weaving or knitting is difficult.

On the other hand, in the above-described embodiment, the embodiment in which the heating layer 20 and the conductive layer 30 are disposed together on the base substrate 10, but the conductive layer 30 may be omitted depending on the purpose of the heating sheet. have. That is, even when the heating layer 20 is disposed on the base substrate 10 and the conductive fiber electrode 40 is directly connected to the heating layer 20 via the conductive adhesive 41 , the heating layer 20 can generate heat. do.

Here, the heating layer 20 may be formed by printing a heating paste in a predetermined pattern on the base substrate 10 , and a pair of the conductive fiber electrodes 40 are formed in different parts of the heating layer 20 , respectively. can be contacted.

As such, the above description has been described according to a limited embodiment showing the technical spirit of the present invention, but the present invention is not limited to a specific embodiment or shape and numerical value, and by changing, mixing, etc., some of the components of the embodiments. Various modifications and variations can be made by those of ordinary skill in the art to which the invention pertains without departing from the gist of the invention, and such modifications and variations are not to be individually understood from the technical spirit or prospect of the present invention. it won't be

10... base material
20... heating layer
30... conductive layer
40... conductive fiber electrode
41... conductive adhesive
42... release paper

Claims (7)

delete delete In the flexible heating sheet, the flexible heating sheet further comprising an electrode for applying electricity to the conductive layer, wherein a heating layer capable of generating heat when energized and a conductive layer connected to the heating layer are respectively disposed on the base substrate of a thin film having flexibility and heat resistance,
The electrode is made of a conductive fiber electrode manufactured in the form of a cotton using a conductive yarn, and the conductive fiber electrode is attached to the surface of the conductive layer through a conductive adhesive or a conductive adhesive,
The heating layer is made by printing a heating paste on the base substrate,
The conductive layer is made by printing a conductive paste on the base substrate, and a pair is connected to different parts of the heating layer, respectively,
A pair of the conductive fiber electrodes are surface-contacted on the conductive layer, respectively,
The thickness of the conductive fiber electrode is 0.001 ~ 0.5mm,
When the conductive fiber electrode is in the form of a fabric, the flexible heating sheet using a fiber electrode, characterized in that the number of threads per 1 inch in width and length is 10 to 2500. delete delete delete delete

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