WO2024049068A1 - Film-type radiation heater - Google Patents

Abstract

The present invention relates to a film-type radiation heater. Specifically, the present invention relates a film-type radiation heater which comprises a printed electrode, and thus not only can reduce the manufacturing cost, but can also ensure a sufficient heating area, increase the allowed current range of the electrode, and reduce the hot-spot effect, thereby implementing high-efficiency heating.

Description

Film type radiant heater

The present invention relates to a film-type radiant heater. Specifically, the present invention reduces manufacturing costs by providing a printed-type electrode, secures a sufficient heating area, and at the same time increases the allowable current range of the electrode and reduces the hot-spot phenomenon, thereby realizing highly efficient heat generation. , about film-type radiant heaters.

A radiant heater refers to a heating device that uses radiant heat from a heat source, and can be used in various fields such as architecture, agriculture, medicine, beauty, and automobiles. In particular, it is a film that has excellent flexibility and bendability and can be applied to surfaces of various shapes. In order to increase the driving convenience of car drivers in winter, type radiant heaters can be applied at the location closest to the driver or passenger, for example, in front of the driver's or passenger's knees.

Figure 1 schematically shows the cross-sectional structure of a conventional film-type radiant heater, and Figure 2 shows a cross-sectional view taken along line A-A' in Figure 1.

As shown in Figures 1 and 2, a conventional film-type radiant heater includes an electrode wiring pattern 20 including a pair of electrodes with different polarities on the upper surface of a base substrate 10, and the electrode wiring pattern 20. ) may include one or more heating elements 30 connected to the electrode wiring pattern 20 and a cover 40 for protecting the heating element 30 from the outside.

In this conventional film-type radiant heater, the electrode wiring pattern 20 is formed by etching copper foil (Cu foil) laminated on the film, etc., but since the price of the film laminated with copper foil is high, screen printing and gravure printing are used. , electrode wiring by printing a metal paste on the base substrate 10 by printing techniques such as roll-to-roll gravure printing, comma coating, roll-to-roll comma coating, flexo, imprinting, and offset printing, and then drying and curing at 100 to 180°C. A method of forming pattern 20 is being explored.

Figure 3 is a cross-sectional view of one embodiment in which a printing-type electrode is formed in a conventional film-type radiant heater, and Figure 4 is a cross-sectional view of another embodiment in which a printing-type electrode is formed in a conventional film-type radiant heater. It is shown.

Specifically, as shown in FIG. 3, one or more heating elements 30 are first printed on the upper surface of the base film 10, and then electrodes with different polarities are printed on both ends of each heating element 30. to form the electrode wiring pattern 20, or as shown in FIG. 4, electrodes are printed on the upper surface of the base film 10 to form the electrode wiring pattern 20, and then both ends have different polarities. One or more heating elements 30 can be printed to be connected to the electrodes.

However, the print-type electrode has a problem that the allowable current is lower than the conventional etching-type electrode and a hotspot phenomenon may occur. In order to increase the allowable current and reduce the hotspot phenomenon, the width or height of the electrode must be increased, in this case. Since the area of the heating element is reduced and the heating area is consequently reduced, there is a problem in that sufficient heat generation cannot be realized.

Therefore, the manufacturing cost is reduced by providing a printed type electrode, and a film-type radiation device can realize high efficiency heat generation by securing a sufficient heat generation area while increasing the allowable current range of the electrode and reducing the hot-spot phenomenon. Heaters are desperately needed.

The purpose of the present invention is to provide a film-type radiant heater that reduces manufacturing costs by being provided with a printed-type electrode.

In addition, the purpose of the present invention is to provide a film-type radiant heater that can achieve high efficiency heat generation by securing a sufficient heating area while increasing the allowable current range of the electrode and reducing the hot-spot phenomenon.

In order to solve the above problems, the present invention,

A film-type radiant heater, comprising a base substrate, an electrode wiring pattern formed on one surface of the base substrate and including a pair of electrodes having different polarities, and one or more heating elements each of which has both ends connected to each of the pair of electrodes. It includes a film-type radiation, wherein the electrode includes a primary electrode whose side is spaced apart from or in contact with the heating element without overlapping the heating element, and a secondary electrode in contact with the primary electrode and the heating element. A heater is provided.

Here, the secondary electrode is formed on top of the primary electrode and overlaps with the heating element to form an overlap section.

In addition, a film-type radiant heater is provided, wherein the secondary electrode width is defined by Equation 1 below.

[Equation 1]

Secondary electrode width = Primary electrode width + (Distance between primary electrode and heating element × 2) + (Overlapping distance between heating element and secondary electrode × 2)

In addition, the width of the primary electrode is 45% or more of the width of the secondary electrode, the distance between the primary electrode and the heating element is 0.1 mm or more, and the overlapping distance between the heating element and the secondary electrode is 0.5 mm or more. Provides a film-type radiant heater that

On the other hand, it is a film-type radiant heater, comprising a base substrate, an electrode wiring pattern formed by printing a metal paste on one surface of the base substrate and including a pair of electrodes with different polarities, and both ends of each of the pair of electrodes. It includes one or more heating elements each connected, wherein the electrode is connected to the heating element such that the heating element overlaps at least one end, and a primary electrode formed by printing a metal paste and an upper surface of the primary electrode. A film-type radiant heater is provided, which is formed by printing a metal paste and includes a secondary electrode whose side is spaced apart from or in contact with the heating element without overlapping the heating element.

Here, a film-type radiant heater is provided, wherein the secondary electrode is formed on an upper part of the primary electrode.

In addition, a film-type radiant heater is provided, wherein the primary electrode width is defined by Equation 2 below.

[Equation 2]

Width of primary electrode = Width of secondary electrode + (Distance between secondary electrode and heating element × 2) + (Overlapping distance between heating element and primary electrode × 2)

In addition, the secondary electrode width is 45% or more of the primary electrode width, the distance between the secondary electrode and the heating element is 0.1 mm or more, and the overlapping distance between the heating element and the primary electrode is 0.5 mm or more. Provides a film-type radiant heater that

Meanwhile, a film-type radiant heater is provided, wherein the total height of the electrodes, including the height of the primary electrode and the height of the secondary electrode, is 25㎛ or less.

In addition, a film-type radiant heater is provided, wherein the heating element is formed by printing a metal paste.

Here, the metal paste provides a film-type radiant heater, characterized in that it contains a base resin, metal powder, and a solvent.

In addition, the base resin provides a film-type radiant heater, wherein the base resin includes at least one selected from the group consisting of epoxy resin, polyester resin, and urethane resin.

In addition, the metal powder is a powder made of one or more metal materials selected from the group consisting of silver (Ag), copper (Cu), aluminum (Al), stainless steel (SUS), nickel (Ni), and alloys thereof. A film-type radiant heater is provided, characterized in that it includes.

In addition, the solvent includes at least one selected from the group consisting of carbitol acetate, ethyl carbitol, butyl carbitol acetate, and butyl carbitol.

And, based on the total weight of the metal paste, the content of the base resin is 1 to 10% by weight, the content of the metal powder is 75 to 90% by weight, and the content of the solvent is 8.9 to 13% by weight. Provides a film-type radiant heater that

Meanwhile, a film-type radiant heater is provided, wherein the heating element is formed by printing a heating paste.

Here, the heating paste provides a film-type radiant heater, characterized in that it contains a base resin and conductive particles.

The film-type radiant heater according to the present invention has an excellent effect of reducing manufacturing costs by providing a printed-type electrode.

In addition, the film-type radiant heater according to the present invention has an excellent effect of realizing highly efficient heat generation by securing a sufficient heating area through a new electrode structure, while increasing the allowable current range of the electrode and reducing the hot-spot phenomenon. indicates.

Figure 1 schematically shows a perspective view of a conventional film-type radiant heater.

FIG. 2 shows a cross-sectional view taken along line A-A' in FIG. 1.

Figure 3 shows a cross-sectional view of one embodiment in which a printing type electrode is formed in a conventional film-type radiant heater.

Figure 4 shows a cross-sectional view of another embodiment in which a printing type electrode is formed in a conventional film-type radiant heater.

Figure 5 is a plan view of a film-type radiant heater according to the present invention.

Figure 6 is a cross-sectional view taken along line A-A' in Figure 5.

Figure 7 is a cross-sectional view of another embodiment of a film-type radiant heater according to the present invention.

Figure 8 is a graph showing voltage versus energized current and output in each film-type radiant heater of Examples and Comparative Examples.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure will be thorough and complete, and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

Figure 5 is a plan view of a film-type radiant heater according to the present invention, and Figure 6 is a cross-sectional view taken along line A-A' in Figure 5.

As shown in FIG. 5, the film-type radiant heater according to the present invention is formed by printing a metal paste on one side of the base substrate 100 and the base substrate 100, and includes a pair of electrodes 210 and 220 having different polarities. ), an electrode wiring pattern 200 including an electrode wiring pattern 200, one or more heating elements 300 with both ends connected to each of the pair of electrodes 210 and 220, the electrode wiring pattern 200 and the one or more heating elements 300. It may include an insulating layer 400 that protects from the outside.

In particular, as shown in FIG. 6, the electrode 220 forming the electrode wiring pattern 200 does not overlap the heating element 300 and has a side spaced apart from or in contact with the heating element 300. It may be composed of a secondary electrode 221 and a secondary electrode 222 in contact with the primary electrode 221 and the heating element 300, and the electrode 210 having a different polarity is the same as the electrode 220. It may be composed of a primary electrode and a secondary electrode.

Through the primary and secondary stacked structures of these electrodes, the film-type radiant heater according to the present invention secures a sufficient heat generation area while realizing highly efficient heat generation by increasing the allowable current range of the electrode and reducing the hot-spot phenomenon. You can.

Specifically, the secondary electrode width can be defined by Equation 1 below with reference to FIG. 6.

[Equation 1]

Secondary electrode width = Primary electrode width + (Distance between primary electrode and heating element × 2) + (Overlapping distance between heating element and secondary electrode × 2)

Specifically, the total height of the primary electrode and the secondary electrode is 25㎛ or less, for example, 10 to 25㎛, the width (1) of the primary electrode is 45% or more of the secondary electrode width (4), and the primary electrode The distance 2 between the heating element and the heating element may be 0.1 mm or more, for example, 0.1 to 0.5 mm, and the overlapping distance 3 between the heating element and the secondary electrode may be 0.5 mm or more, for example, 0.5 to 1.0 mm.

If the secondary electrode width is below the standard, a hot-spot phenomenon may occur because the allowable current range of the electrode is below the standard. On the other hand, if it exceeds the standard, the heating area may be unnecessarily reduced, resulting in insufficient heating effect. .

Figure 7 is a cross-sectional view of another embodiment of a film-type radiant heater according to the present invention.

As shown in Figure 7, the film-type radiant heater according to the present invention includes a pair of electrodes having different polarities and one or more heating elements 300' whose both ends are connected to each of the pair of electrodes, One electrode 220' of the pair of electrodes is connected to the heating element 300' such that the heating element 300' overlaps at least one end, and is a primary electrode formed by printing a metal paste. (221') and the upper surface of the first electrode 221' is formed by printing a metal paste, and the side is spaced apart from the heating element 300' without overlapping with the heating element 300'. It may include a secondary electrode 222' in contact.

Here, the width of the first electrode can be defined by Equation 2 below with reference to FIG. 7.

[Equation 2]

Width of primary electrode = Width of secondary electrode + (Distance between secondary electrode and heating element × 2) + (Overlapping distance between heating element and primary electrode × 2)

Specifically, the total height of the primary electrode and the secondary electrode is 25㎛ or less, for example, 10 to 25㎛, the width (1) of the secondary electrode is 45% or more of the primary electrode width (4), and the secondary electrode The distance 2 between the heating element and the heating element may be 0.1 mm or more, for example, 0.1 to 0.5 mm, and the overlapping distance 3 between the heating element and the primary electrode may be 0.5 mm or more, for example, 0.5 to 1.0 mm.

If the primary electrode width is less than the standard, a hot-spot phenomenon may occur because the allowable current range of the electrode is less than the standard. On the other hand, if it exceeds the standard, the heating area may be unnecessarily reduced and the heating effect may be insufficient. .

Meanwhile, the base substrate 100 and the insulating layer 400 are made of polyimide (PI), polyethylene terephthalate (PET), or polyimide depending on the application field or operating temperature in which the film-type radiant heater is used. Acrylonitrile (PAN), polyurethane (PU), silicone, polycarbonate (PC), tefron, liquid crystal polymer (LCP), polyether ether ketone (poly ether) ether ketone (PEEK), polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethyelenen napthalate (PEN), polyphenylene sulfide : PPS), polyallylate, cellulose triacetate (CTA), cellulose acetate propinonate (CAP), etc. At least one plastic material selected from the group consisting of, preferably polyimide It may include a plastic film made of (polyimide; PI).

The metal paste forming the electrode can be manufactured by mixing metal powder with a base resin. Here, the base resin may include one or more selected from epoxy resin, polyester resin, urethane resin, etc., and the metal powder may be silver (Ag), copper (Cu), aluminum (Al), or stainless steel (SUS). ), nickel (Ni), and alloys thereof may include powders made of metal materials.

In addition, the metal paste may further include one or more solvents selected from carbitol acetate, ethyl carbitol, butyl carbitol acetate, butyl carbitol, etc. to adjust viscosity to improve application workability, wetting and dispersing agents, etc. Other additives may be additionally included.

Here, based on the total weight of the metal paste, the content of the base resin is 1 to 10% by weight, the content of the metal powder is 75 to 90% by weight, the content of the solvent is 8.9 to 13% by weight, and the content of other additives. May be 0.1 to 2% by weight.

The metal paste can be manufactured by pre-mixing the base resin, solvent, and other additives, then mixing and stirring the metal powder to remove air bubbles, and then milling with a 3-roll mill or the like.

The heating elements 300 and 300' can generate heat up to 200°C or higher, preferably 300°C or higher, and each heating element is connected in series or parallel to each other through the electrode wiring pattern 200 on one side of the base substrate 100. It can be formed by printing a heating paste containing a base resin and conductive particles to be connected and then drying it.

The base resin may include epoxy resin, acrylic resin, etc., and the conductive particles may include carbon-based particles such as carbon black, carbon nanotubes, graphite, and activated carbon, and silver (Ag) and copper (Cu ), nickel (Ni), and other metal powders may be additionally included. In particular, carbon nanotubes have a large aspect ratio, so they not only enable the formation of a sufficient electrical network in a small amount, but also increase the glass transition temperature and heat resistance of the heating element composition. It has an effect.

[Example]

1. Manufacturing example

Two samples of the film-type radiant heater of the comparative example having the cross-sectional structure of FIG. 3 and two samples of the film-type radiant heater of the example having the cross-sectional structure of FIG. 6 were manufactured, and each sample had a total length of one electrode of 100 mm. , and has the top view of Figure 5.

2. Resistance evaluation

Examples and Comparative Examples: Power was applied to each sample and the film-type radiant heater product resistance and electrode resistance were measured 10 times each, and the measurement results are shown in Table 1 below.

	Product resistance (Ω·mm)				Electrode resistance (Ω·mm)
	Comparative example		Example		Comparative example		Example
Sample 1	Sample 2	Sample 1	Sample 2	Sample 1	Sample 2	Sample 1	Sample 2
1 time	6.33	5.74	5.56	5.71	0.224	0.208	0.130	0.129
Episode 2	6.00	6.00	6.49	5.19	0.244	0.228	0.142	0.139
3rd time	5.69	5.85	5.91	5.08	0.244	0.230	0.141	0.139
4 times	6.30	5.97	5.78	5.50	0.221	0.207	0.129	0.130
5 times	5.97	5.81	6.51	5.63	0.243	0.233	0.142	0.142
6 times	5.67	5.84	5.49	5.57	0.226	0.202	0.132	0.132
Episode 7	5.69	5.98	5.54	5.29	0.261	0.231	0.138	0.145
Episode 8	5.97	6.07	5.40	5.45	0.255	0.228	0.137	0.143
Episode 9	6.18	5.73	5.08	5.24	0.226	0.214	0.131	0.135
10 times	5.89	5.57	5.10	5.44	0.249	0.237	0.147	0.148
Ieast	5.67	5.57	5.08	5.08	0.221	0.202	0.129	0.129
maximum	6.33	6.07	6.51	5.71	0.261	0.237	0.147	0.148
average	5.97	5.85	5.70	5.41	0.240	0.221	0.137	0.138
overall average	5.91		5.56		0.231		0.138

As shown in Table 1, the film-type radiant heater of the example according to the present invention has electrode resistance reduced by about 40% and product resistance reduced by about 6% compared to the film-type radiant heater of the conventional comparative example, thereby increasing the allowable current of the electrode. And as a result, it was confirmed that the hotspot phenomenon can be reduced.

3. Heat evaluation

Examples and Comparative Examples By applying DC 25V power to each film-type radiant heater and taking pictures with a thermal imaging camera in a heated state, the heating element 1 located at the bottom in the plan view, the heating element 2 located at the top, and the electrode with (-) polarity The temperatures at electrode 1 and (+) polarity electrode 2 were measured, and the measurement results are as shown in Table 2 below.

	Comparative example (℃)				Example (℃)
	Ieast	maximum	difference	difference average	Ieast	maximum	difference	difference average
Electrode 1	32.7	43.5	10.8	11.9	33.9	40.3	6.4	5.5
Electrode 2	30.8	43.8	13.0		30.0	34.6	4.6
Heating element 1	128.8	175.1	46.3	38.5	130.6	165.1	34.5	27.3
Heating element 2	134.6	165.3	30.7		147.1	167.2	20.1

As shown in Table 2, the film-type radiant heater of the example was confirmed to have a heat generation deviation of about 54% reduced from a pair of electrodes and a heat generation deviation of the heating element to be reduced by about 29% compared to the film-type radiant heater of the comparative example. It is believed that the improvement in the structure of the electrode has improved the heat generation deviation in a pair of electrodes and one or more heating elements.

4. Evaluation of electrical characteristics of film-type radiant heater

Examples and Comparative Examples The energizing current and output of each film-type radiant heater were measured according to the applied voltage, and the measurement results are as shown in the graph of FIG. 8. Here, in each of the film-type radiant heaters of Examples and Comparative Examples, the overall width of one electrode was 7 mm and the overall length was 180 mm.

As shown in FIG. 8, it was confirmed that the film-type radiant heater of the example had higher current and output compared to the voltage compared to the film-type radiant heater of the comparative example, and the resistance of the electrode was improved, and at the same time, electric energy was generated through this low-resistance electrode. It was confirmed that the conversion efficiency was improved.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. It will be possible to implement it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be considered to be included in the technical scope of the present invention.

Claims (17)

1. As a film-type radiant heater,

   It includes a base substrate, an electrode wiring pattern formed on one surface of the base substrate and including a pair of electrodes having different polarities, and one or more heating elements whose both ends are connected to each of the pair of electrodes,

   The electrode includes a primary electrode whose side is spaced apart from or in contact with the heating element without overlapping the heating element, and a secondary electrode in contact with the primary electrode and the heating element.
2. According to paragraph 1,

   The secondary electrode is formed on top of the primary electrode and overlaps with the heating element to form an overlap section.
3. According to paragraph 2,

   A film-type radiant heater, wherein the secondary electrode width is defined by Equation 1 below.

   [Equation 1]

   Secondary electrode width = Primary electrode width + (Distance between primary electrode and heating element × 2) + (Overlapping distance between heating element and secondary electrode × 2)
4. According to paragraph 3,

   The primary electrode width is 45% or more of the secondary electrode width, the distance between the primary electrode and the heating element is 0.1 mm or more, and the overlapping distance between the heating element and the secondary electrode is 0.5 mm or more, Film-type radiant heater.
5. As a film-type radiant heater,

   A base substrate, an electrode wiring pattern formed by printing a metal paste on one side of the base substrate and including a pair of electrodes with different polarities, and one or more heating elements each of which has both ends connected to each of the pair of electrodes. Contains,

   The electrode is connected to the heating element so that the heating element overlaps at least one end, and is formed by printing a metal paste on the upper surface of the primary electrode and the primary electrode formed by printing a metal paste and the heating element. A film-type radiant heater including a secondary electrode whose side is spaced apart from or in contact with the heating element without overlapping.
6. According to clause 5,

   A film-type radiant heater, characterized in that the secondary electrode is formed on an upper part of the primary electrode.
7. According to clause 6,

   A film-type radiant heater, characterized in that the primary electrode width is defined by Equation 2 below.

   [Equation 2]

   Width of primary electrode = Width of secondary electrode + (Distance between secondary electrode and heating element × 2) + (Overlapping distance between heating element and primary electrode × 2)
8. In clause 7,

   The secondary electrode width is 45% or more of the primary electrode width, the distance between the secondary electrode and the heating element is 0.1 mm or more, and the overlapping distance between the heating element and the primary electrode is 0.5 mm or more, Film-type radiant heater.
9. According to any one of claims 1 to 8,

   A film-type radiant heater, characterized in that the total height of the electrodes, including the height of the primary electrode and the height of the secondary electrode, is 25㎛ or less.
10. According to paragraph 1,

    A film-type radiant heater, wherein the heating element is formed by printing a metal paste.
11. According to clause 10,

    A film-type radiant heater, wherein the metal paste includes a base resin, metal powder, and a solvent.
12. According to clause 11,

    A film-type radiant heater, wherein the base resin includes at least one selected from the group consisting of epoxy resin, polyester resin, and urethane resin.
13. The method of claim 11, wherein the metal powder is one or more metal materials selected from the group consisting of silver (Ag), copper (Cu), aluminum (Al), stainless steel (SUS), nickel (Ni), and alloys thereof. A film-type radiant heater, characterized in that it contains a powder consisting of.
14. According to clause 11,

    A film-type radiant heater, wherein the solvent includes at least one selected from the group consisting of carbitol acetate, ethyl carbitol, butyl carbitol acetate, and butyl carbitol.
15. The method of claim 11, based on the total weight of the metal paste, the content of the base resin is 1 to 10% by weight, the content of the metal powder is 75 to 90% by weight, and the content of the solvent is 8.9 to 13% by weight. A film-type radiant heater, characterized in that.
16. According to paragraph 1,

    A film-type radiant heater, wherein the heating element is formed by printing a heating paste.
17. According to clause 16,

    The heating paste is a film-type radiant heater, characterized in that it contains a base resin and conductive particles.

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