WO2019190152A1

WO2019190152A1 - Flexible heating sheet using fiber electrode

Info

Publication number: WO2019190152A1
Application number: PCT/KR2019/003478
Authority: WO
Inventors: 조병현
Original assignee: 주식회사 히톨로지
Priority date: 2018-03-29
Filing date: 2019-03-26
Publication date: 2019-10-03
Also published as: KR102318691B1; KR20190114819A

Abstract

The present invention relates to a flexible heating sheet using a fiber electrode and, more specifically, the present invention provides, in order to ensure sufficient electroconductivity of a thin film electrode and improve durability by preventing a thin film electrode from being easily peeled off even after repeated bending or flexing, or repeated heating and cooling, a flexible heating sheet comprising: heating layers (20), which can be heated when current is applied to a thin film base substrate (10) having flexibility and heat resistance; and electrodes connected to the heating layers (20) so as to apply electricity thereto, wherein the electrodes have conductive fiber electrodes (40) manufactured in a planar form by using a conductive yarn, and the conductive fiber electrodes (40) come in contact with the surfaces of the heating layers (20).

Description

Flexible heating sheet using fiber electrode

The present invention relates to a flexible heating sheet using a fiber electrode, and more particularly, to form a heating paste and a conductive paste in a predetermined pattern on the flexible thin film, respectively, and then attaching the conductive fiber electrode on the conductive paste. The present invention relates to a flexible heating sheet using a fiber electrode which maximizes current flow and durability while being flexible.

In general, the flexible heating sheet prints a conductive carbon paste in a predetermined pattern to form a heating layer on a PET film having heat resistance and insulation, and a metal such as a copper thin plate to apply electricity to the heating layer. The electrode is inserted into a structure that is not adhered to the material on the bottom, and is then manufactured by thermally compressing the PET film on the bottom. Since the flexible heating sheet is manufactured in the form of a thin film, the floor heating or the electric heating panel, the mat It is applied to various fields.

As an example related to this technology, Korean Patent Laid-Open Publication No. 10-2011-0104247 discloses a conductive carbon black paste on the surface of a TPU sheet to form a heat generating portion, and conducts a conductive portion by screen printing conductive silver powder on both ends of the heat generating portion. ), And then attaching a silver piece on the conductive portion (conductive layer) to form a terminal portion, connecting an electric wire to the terminal portion end, and forming a lamination portion on the TPU sheet (PTL) flexible planar heating element (Patent Document 1) Has been proposed.

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

In other words, the flexible heating sheet is repeatedly bent, heated and cooled in use, and the conductive portion (conductive layer) printed on the paste (silver powder) and the metal thin plate electrode have a partial difference between the two elements because of the difference in thermal expansion and contraction. Or it is lifted or voids are generated as a whole, the conductance is not good, and further, there is a risk that an arc (spark) phenomenon occurs in the gap generating part may cause a fire.

In order to solve this problem, in some cases, the paste printing conductive part and the metal thin plate electrode are not attached to each other, but the electrode is formed in a structure that is placed on top of each other. However, when the two release elements are simply faced to each other, they are bent in use where flexibility is required. As the bending or bending of the electrode occurs due to a physical external action, there is no circular restoring force due to the characteristics of the thin metal plate electrode, so that a gap is formed by the separation between the two electrodes, thereby generating an arc (spark) phenomenon as described above.

In addition, the structure of two electrodes is in close contact with each other because of weak adhesion between each element, when the incoming voltage is low or when using a DC power supply, the vertical and vertical (between) vertical conduction between each electrode layer is not enough to lose heat generation ability and serious problems in terms of electrical safety. Cause.

Therefore, in some cases, the thin metal electrode is excluded and the conductive paste is formed only by printing the conductive paste. However, in this case, only the conductive paste electrode layer made of a thin film has a limited amount of current and high heat is generated in the electrode layer. Since the heat generation temperature variation per distance of the heat generating layer is severe, it is not only applicable to the large heat generating sheet, but also difficult to apply to the small heating element.

In addition, when damage to the paste electrode layer due to cracks, scratches, oxidation, etc. occurs, the heat generating ability is lowered, and there is a problem that includes 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 provided with a fabric-like heating portion woven with a fiber yarn and a string, the fabric type A pair of conductive parts for supplying power to one side of the heat generating part are woven at regular intervals in a plain weave, and the pair of conductive parts are provided in a row direction in which a plurality of electrode yarns are woven in a plurality of rows. Interweave and interweave as being woven so as to conduct electricity with the pair of conductive parts, wherein the heating yarn is woven and mixed with the fiber yarn in a zigzag shape at regular intervals to the flat fabric on the other side of the pair of conductive parts, The part is interwoven and woven into one of the conductive parts of the pair of conductive parts, and the other end of the heat generating yarn is the one of the conductive parts. An electrical connection comprising a ratio of hayeoseo jumping to a jumping to the one or more conductive portion width non-woven on the side so as to achieve the relationship of the planar heating element and the conductive parts have been proposed.

The heating element such as Patent Document 2 is excellent in flexibility because both the heat generating portion and the conductive portion are woven in the form of a fabric, but the heat generating structure connecting the heat generating material and the electrode portion in a woven manner has a heat generating portion as described above. Since the adhesion force is woven together without attaching to each other and the conductive part is attached to each other, this electrode structure also generates gaps due to spacing when bending or bending occurs due to contraction and expansion by heat or physical force. In addition, since the voltage is lowered or there is no adhesion between the heat generating portion and the conductive portion when using a DC power supply, the amount of energization is lowered, which may cause a loss of heat generating ability.

[Patent Document 1] Republic of Korea Patent Publication No. 10-2011-0104247

[Patent Document 2] Republic of Korea Patent No. 10-0641693

The present invention for solving the problems inherent in the prior art, it is possible to ensure sufficient electrical conductivity of the thin film electrode, and also to prevent the thin film electrode from being easily peeled off by repeated bending and bending, or repeated heating and cooling. , To protect the paste-type heating layer and / or conductive layer to prevent cracks, scratches, oxidation, etc. to improve the durability, as well as to prevent a decrease in the amount of power supply when the power is applied with high adhesion The purpose is to provide a flexible heating sheet used.

In the flexible heating sheet using the fiber electrode of the present invention for achieving the above object, a heat generating layer capable of generating heat during energization is disposed on a base substrate of a thin film having flexibility and heat resistance, and is 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 a surface 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 the 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 heat generating layer capable of generating heat during energization and a conductive layer connected to the heat generating layer are respectively disposed on the base substrate of the thin film having flexibility and heat resistance, and the electricity is supplied to the conductive layer. It further comprises a thin film electrode to be applied, wherein the thin film electrode is made of a conductive fiber electrode made of a surface form such as a woven fabric or knitted fabric or non-woven fabric of the conductive yarn, the fiber electrode on the conductive layer via a conductive adhesive It is characterized in that the surface contact to be attached to each other to enable electricity.

In this case, the heating layer is formed by printing a heating paste on the base substrate, and the conductive layer is made by printing a conductive paste on the base substrate, and a pair is connected to different portions of the heating layer, respectively, and the conductive fiber electrode Each pair of silver may be in surface contact on the conductive layer.

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 one inch each of the width and length is characterized in that 10 to 2500.

Also. The conductive fiber electrode is characterized in that the surface 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 the predetermined area on the conductive layer having the predetermined area is surface contacted (attached) through the mutual conductive adhesive, so that the electrical conductivity can be improved, The flexible fiber electrode prevents surface contact from being easily lifted or separated under any conditions or conditions such as repeated bending and repeated heating and cooling, improving the electrical safety and durability of the heating element. The initial heat generation performance can be maintained as it is.

Accordingly, in addition to applying a commercial alternating current, it is possible to stably apply a low voltage DC current, which can be applied to a portable heating element, and also to apply a DC current to a larger heating element, which is smaller than the conventional one, including a small heating element. Therefore, there is an advantage that it can be applied to various heating products, and it is possible to mass-produce a DC-type heating element, which was previously impossible, by a roll-to-roll process, thereby providing a more stable quality heating element at a lower unit cost. Has the same effect.

1 is a plan view of a heating sheet according to an embodiment of the present invention.

2 is an enlarged cross-sectional view taken along line A-A of FIG.

Figure 3 is a real picture of the conductive fiber electrode of the heating sheet according to an embodiment of the present invention.

4 is a structural diagram of a conductive fiber electrode of the heating sheet according to an embodiment of the present invention.

5 is a real picture of a state in which the unspecified point is freely bent to show the flexibility of the heating sheet according to the embodiment of the present invention.

[Description of Drawing Reference]

10 ... Base Base

20 ... heating layer

30 ... conductive layer

40 ... conductive fiber electrode

41 ... conductive adhesive

42 ... release paper

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

In another aspect, in the flexible heating sheet using the fiber electrode of the present invention, a heat generating layer capable of generating heat during energization and a conductive layer connected to the heat generating layer are respectively disposed on the base substrate of the thin film having flexibility and heat resistance, and the electricity is supplied to the conductive layer. It further comprises a thin film electrode to be applied, wherein the thin film electrode is made of a conductive fiber electrode made of a surface form such as a woven fabric or knitted fabric or non-woven fabric of the conductive yarn, the fiber electrode on the conductive layer via a conductive adhesive It is attached and is in surface contact with each other to enable energization.

As a preferred embodiment, the thickness of the conductive fiber electrode may be 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 of the width and length may be 10 to 2500.

Also. The conductive fiber electrode may be surface-attached via a conductive adhesive or a conductive adhesive.

The present invention may be modified in various ways and may have various embodiments. Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention. However, this is not intended to limit the present invention only to the illustrated embodiments, and the spirit and scope of the present invention include ordinary modifications and equivalents or substitutes of the illustrated forms.

In addition, throughout the specification, the fact that a part is 'connected' to another part includes 'directly connected' or 'indirectly connected' with an element, and 'comprising' to include an element is particularly contrary. Unless otherwise stated, it means that other components can be added, not to exclude other components.

1 is a plan view of a heat generating 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 physical picture of a conductive fiber electrode of a heat generating sheet according to an embodiment of the present invention. 4 is a structure of the conductive fiber electrode of the heating sheet according to an embodiment of the present invention, Figure 5 is a real picture of the state unrefractively bent to show the flexibility of the heating sheet according to an embodiment of the present invention .

As shown in FIG. 1 and FIG. 2, the flexible heating sheet of the present invention includes 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, and the like. In addition to the flexibility and heat resistance is not limited to the material, material and form.

The heat generating layer 20 may be screened, gravure printed, etched, offset, photogravure, impregnated, or coated with a paste or ink material having a property of self-heating when electricity is applied, such as conductive carbon paste. It is formed in a predetermined area and a predetermined pattern with respect to the surface of the base substrate 10 through.

The conductive layer 30 is in contact with the heat-generating layer 20 to enable electricity, screen printing, gravure printing, etching, offset, photogravure, paste containing a conductive metal powder such as gold, silver, copper, 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, wherein the conductive layer 30 is a pair of electrically separated, each conductive layer 30 has an electrode function of applying electricity to the heat generating layer 20 by being connected to different portions of the heat generating layer 20.

The conductive fiber electrode 40 is formed of a non-woven fabric by weaving a yarn-shaped conductive yarn having electrical conductivity properties in a known manner such as weaving or knitting, or binding the fiber assembly through a mechanical, chemical or heat treatment process. The surface-conducting conductive fiber electrode 40 is also attached to the electrically conductive pair 30 is a pair of electrically separated. 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-adhered to the surface of the conductive layer 30 to enable vertical vertical energization through the conductive adhesive 41 or the adhesive.

As shown in FIGS. 3 and 4, the conductive fiber electrode 40 may be manufactured in a band shape having a predetermined width and a predetermined length, and the conductive adhesive 41 may be formed on one side of the conductive fiber electrode 40. After application, the release paper 42 may be attached to the surface of the conductive adhesive 41 to be manufactured in the form of a kind of tape.

The conductive adhesive 41 generally refers to a conductive adhesive or adhesive composition, and has conductive properties because the conductive powder is mixed in the composition and has heat resistance. The manufacturing method of the conductive adhesive 41 is, for example, Korean Patent Publication No. 1990-A. Since it is known from many patent documents such as 0001014, detailed description thereof will be omitted.

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

The purpose of the present invention is that it is not easy to manufacture the conductive fiber electrode 40 to a thickness of 0.001 mm or less through a weaving, knitting, or nonwoven fabric manufacturing method such as woven fabric. In other words, it does not serve the purpose of providing a flexible heating sheet.

3 is a real picture of the conductive fiber electrode 40, the thickness is 0.14mm, 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 and As described above, sufficient flexibility was secured, and even when heating and cooling were repeated, the separation of the conductive layer and the fiber electrode did not occur, and thus stable power supply was confirmed.

Therefore, as described above, considering the ease of manufacture of the conductive fiber electrode 40, sufficient energization amount, and ensuring the flexibility at the same time, the thickness of the conductive fiber electrode 40 is preferably manufactured within the range of 0.1 ~ 0.2mm.

On the other hand, when the conductive fiber electrode 40 is in surface contact with the conductive layer 30, the vertical vertical conductance between the two elements can be sufficiently secured, and at the same time it is important to maximize the contact area between the two elements, 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 taken into consideration when manufacturing the aforementioned nonwoven fabric, but it is necessary to take into consideration since it affects the adhesion with the conductive layer when weaving by the weaving method.

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

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

If the density of the conductive fiber electrode 40 is 10 or less, the density is low, so that the electrical conduction and adhesion with the conductive layer 30 are lowered. On the contrary, if the density is 2500 or more, the process such as weaving or knitting is difficult, which is not preferable.

Meanwhile, in the above-described embodiment, although the heating layer 20 and the conductive layer 30 are disposed together on the base substrate 10, the conductive layer 30 may be omitted according to the purpose of the heating sheet. have. That is, even when the heat generating layer 20 is disposed on the base substrate 10 and the conductive fiber electrode 40 is directly connected to the heat generating layer 20 via the conductive adhesive 41, the heat generating layer 20 can generate heat. Do.

Here, the heating layer 20 may be formed by printing a heating paste on the base substrate 10 in a predetermined pattern, and the conductive fiber electrode 40 may have a pair of surfaces at different portions of the heating layer 20, respectively. Can be contacted.

As described above, the above description has been made according to a limited embodiment showing the technical idea of the present invention. However, the present invention is not limited to a specific embodiment, shape, and numerical value, and a part of the embodiments may be changed and mixed. Various modifications and changes can be made by those skilled in the art without departing from the gist of the invention, and such modifications and changes may be separately understood from the technical spirit or the prospect of the present invention. I will not.

Claims

In the flexible heating sheet comprising an electrode for heating the heat generation layer is disposed on the base substrate of the thin film having flexibility and heat resistance, the electrode is connected to the heating layer to apply electricity,

The electrode is made of a conductive fiber electrode manufactured in the form of a surface using a conductive yarn, the flexible heating sheet using a fiber electrode, characterized in that the conductive fiber electrode is in contact with the surface of the heat generating layer.
The method according to claim 1,

The heating layer is made by printing a heating paste on the base substrate,

The conductive fiber electrode is a flexible heating sheet using a fiber electrode, characterized in that the pair is in surface contact with each other at different portions of the heating layer.
A flexible heating sheet further comprising a heat generating layer capable of generating heat during energization and a conductive layer connected to the heat generating layer, and an electrode for applying electricity to the conductive layer, respectively, on the base substrate of the thin film having flexibility and heat resistance.

The electrode is made of a conductive fiber electrode manufactured in the form of a surface using a conductive yarn, the flexible heating sheet using a fiber electrode, characterized in that the conductive fiber electrode is in contact with the surface of the conductive layer.
The method according to claim 3,

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, each pair is connected to different portions of the heating layer,

And a pair of conductive fiber electrodes are in surface contact with each other on the conductive layer.
The method according to claim 1 or 3,

Flexible conductive sheet using a fiber electrode, characterized in that the thickness of the conductive fiber electrode is 0.001 ~ 0.5mm.
The method according to claim 1 or 3,

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 each of the width and length is 10 to 2500.
The method according to claim 1 or 3,

The conductive fiber electrode is a flexible heating sheet using a fiber electrode, characterized in that the surface attached via a conductive adhesive or conductive adhesive.