KR20200108569A - Film radiation heater - Google Patents

Abstract

The present invention relates to a film radiation heater, which is light, has high energy efficiency, and suppresses deformation or damage to a product which may occur during a heat generation process. The present invention relates to an ultra-lightweight high-efficiency film radiant heater. According to the present invention, the film radiation heater includes a heating element film, a spacer, and a reflector. The heating element film includes a plurality of planar heating elements based on a carbon material which generates heat by receiving power to emit radiant heat and far infrared rays. The spacer is laminated on a rear surface of the heating element film, and includes a plurality of air insulating windows. In addition, the reflector is laminated on the rear surface opposite to the front surface of the spacer on which the heating element film is stacked, and reflects radiant heat and far infrared rays emitted from the heating element film toward the spacer toward the heating element film.

Description

Film radiation heater

The present invention relates to a heater, and more particularly, to a film radiation heater that emits radiant heat.

A typical radiation heater is composed of a metal plate coated with a far-infrared radiation ceramic powder for far-infrared radiation, a heating source such as a heating wire or a sheath heater, and an insulating material such as glass wool at the rear of the heating source. Such a radiant heater is heavy because the weight of the heat source increases rapidly in proportion to the heat output, and, for example, in the case of a 1kW-class embedded radiant panel for construction, it is close to about 6kg. Since the radiant heater is provided with a heating source and a metal plate separately, heat loss occurs in the process of transferring heat from the heating source to the metal plate, and thus, it is difficult to provide a quick feeling of heat.

Meanwhile, in the case of general buildings such as offices and homes, convection heaters that heat and blow air are used. In the case of a convection heater, power efficiency is low, and noise, dust, and dryness are caused.

Unexamined Patent Publication No. 2016-0039415 (2016.04.11.)

Accordingly, an object of the present invention is to provide a film radiation heater capable of reducing weight and reducing thickness.

Another object of the present invention is to provide a film radiant heater that emits both radiant heat and far infrared rays.

Another object of the present invention is to provide a film radiant heater that emits high radiant heat with low power.

Another object of the present invention is to provide a film radiation heater having a high temperature rise rate.

Another object of the present invention is to provide a film radiation heater capable of suppressing deformation or damage to a product due to generated heat.

In order to achieve the above object, the present invention is a heating element film having a plurality of planar heating elements based on a carbon material that emits radiant heat and far-infrared rays by heating by receiving power; A spacer stacked on the rear surface of the heating element film and having a plurality of air insulating windows; And a reflector that is laminated on a rear surface opposite to the front surface of the spacer on which the heating element film is stacked, and reflects radiant heat and far-infrared rays emitted from the heating element film toward the spacer toward the heating element film. Provides.

In the heating element film, the plurality of planar heating elements are arranged on a plane.

The spacer includes the plurality of air insulating windows formed in a grid shape.

The spacer may include a frame frame forming an inner space; And an inner frame connected to the frame frame to divide the inner space into a grid to form the plurality of air insulating windows.

The area of the air insulation window is larger than the area of the planar heating element.

Each of the plurality of planar heating elements is disposed inside the air insulation window.

At least one air in/out hole connected to the plurality of air insulation windows is formed in the heating element film.

The at least one air in/out hole is formed to be spaced apart from the plurality of planar heating elements.

At least one air in/out hole connected to the plurality of air insulation windows is formed in the reflector.

The carbon material includes at least one of carbon black, carbon nanotubes, graphite, and activated carbon.

The present invention also includes a heating element film having a plurality of planar heating elements based on a carbon material that generates heat by receiving power to emit radiant heat and far infrared rays; A spacer stacked on the rear surface of the heating element film and having a plurality of air insulating windows; And a reflector that is laminated on a rear surface opposite to the front surface of the spacer on which the heating element film is stacked, and reflects radiant heat and far-infrared rays emitted from the heating element film toward the spacer toward the heating element film, wherein at least one of the heating element film and the reflective plate It provides a film radiation heater, characterized in that at least one air inlet and outlet holes respectively connected to the plurality of air insulation windows are formed.

And the heating element film, a base film on which the spacer is laminated on the rear surface; An electrode wiring pattern formed on the entire surface of the base film; The plurality of planar heating elements formed on the front surface of the base film to be connected to the electrode wiring pattern, and generating heat by receiving power through the electrode wiring pattern; And a cover layer covering the entire surface of the base film on which the plurality of planar heating elements are formed.

When the air discharge hole is formed in the heating element film, the air discharge hole is formed through the electrode wiring pattern and the base film and the cover layer spaced apart from the plurality of planar heating elements.

Since the film radiation heater according to the present invention has a structure in which a spacer having a plurality of air insulation windows is interposed between a heating element film and a reflecting plate to have a laminated structure, it is possible to reduce the weight and thickness of the product.

Since the reflector is installed on the rear surface of the heating element film via a spacer, the radiant heat and far infrared rays lost to the rear surface of the heating element film are reflected by the reflector to radiate it to the front surface of the heating element film, thereby reducing the loss of radiant heat and far infrared rays. Radiant heat and far-infrared rays through the entire surface of the film can be emitted to increase efficiency.

The heating element film includes a planar heating element including carbon black, carbon nanotubes, graphite, or activated carbon, and since the planar heating element is a block body, radiant heat and far-infrared rays are emitted from the planar heating element together. For this reason, the film radiant heater according to the present invention can omit the heat transfer process as compared to the conventional radiant heater, so that energy efficiency is high, and in the case of the same heat output, it can provide a quick feeling of heat. The film radiation heater according to the present invention can obtain additional energy efficiency improvement due to blackbody radiation.

Since the film radiation heater according to the present invention includes a heating element film having a planar heating element that can be driven with low power, high radiant heat can be emitted at low power. Since the planar heating element has a wider heating area than the hot wire heater, it is possible to reduce heat loss that may occur during the heat transfer process.

Since the film radiation heater according to the present invention is based on a film made of a plastic material, the product itself has a low heat capacity and a high temperature rise rate.

Since the film radiation heater according to the present invention has a lower allowable current than the hot wire heater, it can generate a high heating temperature with a low current amount.

The film radiant heater according to the present invention does not require a separate heat insulating layer because the plurality of air insulating windows formed on the spacer serve as heat insulating layers while the spacer separates the heating element film and the reflecting plate from each other. Since the spacer is provided with a plurality of air insulated windows, it is possible to reduce the weight of the manufactured film radiation heater.

Air in/out holes are formed toward the heating element film or the reflector to be connected to the air insulation windows of the spacer, and the air heated in the air insulation window is discharged through the air in/out holes according to the heat generation of the heating element film. It is possible to suppress deformation or damage to the film radiation heater by expanding according to the heat generation of the heating element film.

The film radiation heater according to the present invention can be manufactured in a direct current or alternating current driving type, and when manufactured in a direct current driving type, it is possible to fundamentally block the generation of electromagnetic waves.

The film radiation heater according to the present invention can be used in various environments such as the interior of a vehicle, under a desk, and a wall.

1 is an exploded perspective view of a film radiation heater according to a first embodiment of the present invention.
2 is a plan view of FIG. 1.
3 is a cross-sectional view taken along line 3-3 of FIG. 2.
4 is an exploded perspective view of a film radiation heater according to a second embodiment of the present invention.
5 is a plan view of FIG. 4.
6 is a cross-sectional view taken along line 6-6 of FIG. 5.
7 is a plan view showing a first experimental example of the film radiation heater according to the first embodiment of the present invention.
8 is a thermal image of the film radiation heater of FIG. 7.
9 is a graph showing the heating behavior of the film radiation heater of FIG. 7.
10 is a graph showing a temperature change of a heat receiving unit of the film radiation heater of FIG. 7.
11 is a thermal image of a film radiation heater according to a comparative example.
12 is a graph showing the heating behavior of the film radiation heater of FIG. 11.
13 is a thermal image of a film radiation heater according to a second experimental example of the first embodiment of the present invention.
14 is a graph showing the heating behavior of the film radiation heater of FIG. 13.

In the following description, it should be noted that only parts necessary for understanding the embodiments of the present invention will be described, and descriptions of other parts will be omitted without distracting the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to a conventional or dictionary meaning, and the inventor is appropriate as a concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention on the basis of the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application And it should be understood that there may be variations.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[First embodiment]

1 is an exploded perspective view of a film radiation heater according to a first embodiment of the present invention. 2 is a plan view of FIG. 1. And it is a cross-sectional view taken along line 3-3 of FIG. 2 of FIG. 3.

1 to 3, the film radiation heater 100 according to the first embodiment includes a heating element film 10, a spacer 60 and a reflector 70 sequentially stacked on the rear surface of the heating element film 10. Includes. The heating element film 10 includes a plurality of planar heating elements 40 based on a carbon material that generates heat by receiving power to emit radiant heat and far-infrared rays. The spacer 60 is laminated on the rear surface of the heating element film 10 and includes a plurality of air insulating windows 63. In addition, the reflector 70 is laminated on the rear surface opposite to the front surface of the spacer 60 on which the heating element film 10 is stacked, and the radiant heat and far-infrared rays emitted from the heating element film 10 toward the spacer 60 are transferred to the heating element film 10. Reflects to the side.

In addition, the film radiation heater 100 according to the first embodiment may further include a protective film 80 laminated on the entire surface of the heating element film 10. The protective film 80 may be omitted if necessary.

The film radiation heater 100 according to the first embodiment is a heater using radiant heat and far infrared rays emitted through the front surface of the heating element film 10.

Meanwhile, radiant heat and far-infrared rays generated from the heating element film 10 are radiated to the rear as well as the front surface of the heating element film 10. Radiant heat and far-infrared rays emitted to the rear surface of the heating element film 10 are elements lost in the film radiation heater 100. Therefore, the film radiation heater 100 according to the first embodiment includes a spacer 60 and a reflector 70 stacked on the rear surface of the heating element film 10, and the spacer 60 and the reflector 70 are heat insulating materials. It suppresses the loss of radiant heat and far infrared rays to the rear surface of the film 10. In addition, the reflector 70 reflects radiant heat and far-infrared rays lost to the rear surface of the heating element film 10 toward the heating element film 10 and radiates it to the front surface of the heating element film 10, thereby reducing the loss of radiant heat and far-infrared rays. (10) Radiant heat and far-infrared rays through the front can increase efficiency.

In addition, the film radiation heater 100 according to the first embodiment has at least one air inlet and outlet hole 11 connected to the plurality of air insulating windows 63 in the heating element film 10. The air in/out hole 11 discharges air heated in the air insulation window 63 out of the air insulation window 63 according to the heat generated by the heating element film 10. In this way, by allowing air to enter and exit the air insulation window 63 through the air in/out hole 11, the air in the air insulation window 63 expands by the heating of the heating element film 10, and the film radiation heater 100 It is possible to suppress the deformation or damage of the.

The film radiation heater 100 according to the first embodiment will be described in detail as follows.

The heating element film 10 includes a base film 20, an electrode wiring pattern 30, a plurality of planar heating elements 40, and a cover layer 50. The base film 20 is a base layer capable of forming an electrode wiring pattern 30, a plurality of planar heating elements 40, and a cover layer 50. The electrode wiring pattern 30 is formed on the front surface 23 of the base film 20 and may be formed of a metal material. A plurality of planar heating elements 40 are formed on the front surface 23 of the base film 20 to be connected to the electrode wiring pattern 30, and generate heat by receiving power through the electrode wiring pattern 30. And the cover layer 50 covers the front surface 23 of the base film 20 on which the plurality of planar heating elements 40 are formed.

The base film 20 has a rear surface 21 and a front surface 23 opposite to the rear surface 21. In the base film 20, the rear surface 21 is bonded to the front surface of the spacer 60. An electrode wiring pattern 30, a plurality of planar heating elements 40, and a cover layer 50 are formed on the front surface 23 of the base film 20. A plastic film may be used as the base film 20. Materials of the plastic film include polyetherimide (PEI), polyimide, polyurethane (polyurethane; PU), polyacrylonitrile (PAU), silicone, polycarbonate (PC), Teflon, Liquid crystal polymer (LCP), polyetheretherketone (PEEK), polyethersulphone (PEEK), polyacrylate (PAR), polyethylene naphthalate (polyethyelenen napthalate; PEN), polyethylene terephthalate Polyethyeleneterepthalate (PET), polyphenylene sulfide (PPS), polyallylate, cellulose triacetate (CTA) or cellulose acetate propinonate (CAP) can be used. And are not limited to those listed.

The base film 20 may be appropriately selected according to an application field in which the film radiation heater 100 is used or a heating temperature.

Based on a plastic material, the base film 20 has a far-infrared emissivity of about 0.88 compared to a black body, so it can be used as a far-infrared radiation plate, and no separate treatment is required.

The electrode wiring pattern 30 is formed on the front surface 23 of the base film 20 and supplies power applied from the outside to the planar heating element 40. The electrode wiring pattern 30 may be formed of a metal material to minimize voltage drop. As a metal material forming the electrode wiring pattern 30, silver, aluminum, copper, nickel, stainless steel, or an alloy thereof may be used.

The electrode wiring pattern 30 may be formed by an etching method using a metal foil or a printing method using a metal paste. That is, the electrode wiring pattern 30 may be formed by laminating a metal foil on the front surface 23 of the base film 20 and then patterning it using an etching method. Alternatively, the electrode wiring pattern 30 may be formed by printing a metal paste on the front surface 23 of the base film 20.

The electrode wiring pattern 30 may include a pair of electrode terminals 33 and a pair of electrode pads 35. A planar heating element 40 is formed to connect the pair of electrode terminals 33 and is laminated by the cover layer 50. In addition, the pair of electrode pads 35 are connected to the pair of electrode terminals 33, respectively, and protrude out of the cover layer 50 to receive power.

The planar heating element 40 is formed to connect the pair of electrode terminals 33 of the electrode wiring pattern 30. The planar heating element 40 may be formed by printing a heating element composition to connect the pair of electrode terminals 33, followed by drying and curing. As a printing method of the heating element composition, screen printing, gravure printing (or roll-to-roll gravure printing), comma coating (or roll-to-roll comma coating), flexo, imprinting, offset printing, spraying, and the like may be used. Drying and curing may be performed at 100°C to 300°C.

The planar heating element 40 is formed to be arranged in a horizontal direction on the front surface of the base film 20. That is, the planar heating element 40 may be formed on the front surface 23 of the base film 20 in an n matrix (n, m is a natural number of 2 or more). For example, in the first embodiment, an example in which the planar heating elements 40 are formed in two rows and three rows is disclosed, but the present invention is not limited thereto. At this time, the electrode wiring pattern 30 is formed to connect a plurality of planar heating elements 40 formed on the front surface 23 of the base film 20 in series or in parallel.

The heating element composition forming the planar heating element 40 is based on a carbon material and may further include a binder. The carbon material includes at least one of carbon black, carbon nanotubes, graphite, and activated carbon. Since such a carbon material is a black body, the film radiation heater 100 according to the first embodiment may obtain additional energy efficiency improvement due to black body radiation. Since the film radiation heater 100 according to the first embodiment also radiates far-infrared rays due to blackbody radiation, it is possible to provide useful far-infrared rays to users.

Since the heating element film 10 includes a planar heating element 40 that can be driven with low power, the film radiation heater 100 according to the first embodiment can emit high radiant heat with low power. Since the planar heating element 40 has a wider heating area than the hot wire heater, it is possible to reduce heat loss that may occur during a heat transfer process.

In addition, the cover layer 50 is formed to cover the front surface 23 of the base film 20 on which the plurality of planar heating elements 40 are formed. The cover layer 50 has a function of protecting the electrode wiring pattern 30 formed on the front surface 23 of the base film 20 and the plurality of planar heating elements 40 from the external environment, and occurs in a plurality of planar heating elements 40 It performs the function of dissipating the generated heat to the outside. As the material of the cover layer 50, films such as a urethane film, a silicone film, an imide-based film, and a PET film, and related resins may be used. For example, when a film is used as the cover layer 50, the cover layer 50 may be bonded to the base film 20 by hot pressing or laminating. When a liquid resin is used as the cover layer 50, the cover layer 50 may be bonded to the base film 20 using a printing and coating method such as screen printing, spray coating, and comma coating.

The heating element film 10 may be manufactured in a direct current or alternating current driving type, and when manufactured in a direct current driving type, it is possible to fundamentally block the generation of electromagnetic waves.

The protective film 80 is laminated on the cover layer 50 of the heating element film 10. As a material of the protective film 80, a film made of an insulating plastic material may be used. The protective film 80 may be a decorative film for decorating the film radiation heater 100.

The spacer 60 is interposed between the heating element film 10 and the reflective plate 70. The spacer 60 may be attached to the heating element film 10 and the reflective plate 70 using an adhesive. As the adhesive, an acrylic, epoxy, polyimide, or urethane adhesive may be used.

The spacer 60 includes a plurality of air insulating windows 63 formed in a grid shape. The spacer 60 may include an edge frame 65 and an inner frame 67. The frame frame 65 forms an inner space 61. The inner frame 67 is connected to the frame frame 65 and divides the inner space 61 into a grid to form a plurality of air insulating windows 63.

The area of the air insulation window 63 is formed larger than the area of the planar heating element 40. Each of the plurality of planar heating elements 40 may be disposed inside the air insulation window 63. That is, when the planar heating element 40 is positioned on the inner frame 67, the heat generated by the planar heating element 40 through the inner frame 67 may be lost. Since the planar heating element 40 is positioned above the air insulated window 63, the air layer of the air insulated window 63 is located under the planar heating element 40, thus maximizing the heat insulation effect by the air layer of the air insulated window 63 can do.

The spacer 60 does not require a separate insulation layer because the plurality of air insulation windows 63 formed on the spacer 60 function as a heat insulation layer while separating the heating element film 10 and the reflective plate 70 from each other. . Since the spacer 60 includes a plurality of air insulating windows 63, the weight of the manufactured film radiation heater 100 can be reduced.

The spacer 60 may use a film of the same material as the base film 20 of the heating element film 10 according to the use temperature. The spacer 60 may have a thickness of 55 μm or more. Spacers of less than 50 μm are deformed by heat and pressure during lamination processes such as lamination and hot pressing between the heating element film and the spacer, or between the spacer and the reflector, and are lower than the actual thickness, resulting in a problem that a sufficient air insulation layer and reflective space cannot be formed. have. Preferably, the spacer 60 may have a thickness of 75 μm or more.

On the other hand, when the thickness of the spacer 60 increases, the thickness of the film radiation heater 100 also increases, so the thickness of the spacer 60 can be appropriately determined according to the application field or the heating temperature in which the film radiation heater 100 is used. have.

The heating element film 10 has at least one air in/out hole 11 connected to the plurality of air insulation windows 63. At least one air inlet and outlet hole 11 is formed to be spaced apart from the plurality of planar heating elements 40 and the electrode wiring pattern 30.

The reason for forming the air in/out hole 11 in this way is to discharge the air heated by the air insulation window 63 to the outside according to the heat generated by the heating element film 10. For example, when the air insulation window is formed as a space enclosed by the heating element film and the reflector, the air in the air insulation window expands due to the heat generated by the heating element film and may cause deformation or damage such as swelling or peeling of the film radiation heater. Therefore, by forming the air in/out hole 11 connecting the air insulation window 63 and the outside, deformation or damage of the film radiation heater 100 due to expansion of air in the air insulation window 63 can be suppressed. .

In addition, the reflector 70 is attached to the rear surface of the spacer 60. As the reflective plate 70, a metal plate such as aluminum, stainless steel, zinc steel plate, or the like may be used. As the reflective plate 70, it is preferable to use a metal plate made of aluminum having a thin thickness in consideration of the reflectance of far infrared rays.

As described above, the film radiation heater 100 according to the first embodiment has a structure in which a spacer 60 having a plurality of air insulating windows 63 is interposed between the heating element film 10 and the reflector 70 to have a stacked structure. Therefore, it is possible to reduce the weight and thickness of the product.

Since the film radiation heater 100 according to the first embodiment is based on a film made of a plastic material, the product itself has a low heat capacity and a high temperature increase rate.

Since the film radiation heater 100 according to the first embodiment has a lower allowable current than that of the hot wire heater, a high heating temperature can be generated with a low amount of current.

In the first embodiment as described above, the film radiation heater 100 may be manufactured as follows.

First, a heating element film 10 is manufactured. That is, an electrode wiring pattern 30 is formed on the front surface 23 of the base film 20. Next, a plurality of planar heating elements 40 are formed to be connected to the electrode wiring pattern 30. A cover layer 50 is formed on the front surface 23 of the base film 10 so as to cover the electrode wiring pattern 30 and the plurality of planar heating elements 40. Then, a protective film 80 is laminated on the cover layer 50.

Next, air in/out holes 11 are formed in the heating element film 10 on which the protective film 80 is laminated. That is, the air in/out hole 11 is formed in the protective film 80 and the heating element film 10 by perforating a position corresponding to the air insulation window 63 of the spacer 60, but the electrode wiring pattern 30 and the planar heating element It is formed in the area separated from (40).

Next, the spacer 60 is manufactured. An original to be manufactured with the spacer 60 is prepared. The original plate may include a plastic original plate, an adhesive layer formed on both sides of the plastic original plate, and a release film covering the adhesive layer on both sides. By punching out such a disk, a spacer 60 having a plurality of air insulating windows 63 is manufactured.

Next, the reflector 70 is manufactured. A metal plate to be manufactured as the reflector 70 is prepared. The reflector 70 can be manufactured by punching out such a metal plate.

At this time, an example in which the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflecting plate 70 proceeds in order has been disclosed, but is not limited thereto. For example, the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflector 70 may be performed regardless of the order. Alternatively, the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflector 70 may be performed in parallel.

And after the heating element film 10, the spacer 60 from which the release film has been removed, and the metal plate 70 are sequentially stacked, the film radiation heater 100 according to the first embodiment is manufactured through a lamination or hot frame process. .

[Second Example]

Meanwhile, in the first embodiment, an example in which the air in/out holes 11 are formed in the protective film 80 and the heating element film 10 is disclosed, but is not limited thereto. For example, as shown in FIGS. 4 to 6, an air in/out hole 71 may be formed in the reflective plate 70.

4 is an exploded perspective view of a film radiation heater 200 according to a second embodiment of the present invention. 5 is a plan view of FIG. 4. And FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5.

4 to 6, the film radiation heater 200 according to the second embodiment includes a heating element film 10, a spacer 60 and a reflector 70 sequentially stacked on the rear surface of the heating element film 20. It has the same structure as the film radiation heater (100 in FIG. 1) according to the first embodiment in that it includes. However, the film radiation heater 200 according to the second embodiment differs from the film radiation heater according to the first embodiment in that the air inlet and outlet holes 71 are formed in the reflective plate 70.

Therefore, the film radiation heater 100 according to the second embodiment will be described with a focus on the reflector 70.

The reflector 70 has at least one air in/out hole 71 connected to the plurality of air insulation windows 63. In the second embodiment, an example in which five air inlet and outlet holes 71 are formed so as to be respectively connected to the air insulating window 63 is disclosed, but the present invention is not limited thereto.

In this second embodiment, the film radiation heater 200 may be manufactured as follows.

First, a heating element film 10 is manufactured. That is, an electrode wiring pattern 30 is formed on the front surface 23 of the base film 20. Next, a plurality of planar heating elements 40 are formed to be connected to the electrode wiring pattern 30. A cover layer 50 is formed on the front surface 23 of the base film 10 so as to cover the electrode wiring pattern 30 and the plurality of planar heating elements 40. Then, a protective film 80 is laminated on the cover layer 50.

Next, the spacer 60 is manufactured. An original to be manufactured with the spacer 60 is prepared. The original plate may include a plastic original plate, an adhesive layer formed on both sides of the plastic original plate, and a release film covering the adhesive layer on both sides. By punching out such a disk, a spacer 60 having a plurality of air insulating windows 63 is manufactured.

Next, the reflector 70 is manufactured. A metal plate to be manufactured as the reflector 70 is prepared. The reflector 70 can be manufactured by punching out such a metal plate.

Next, an air in/out hole 71 is formed in the reflective plate 70. That is, a position corresponding to the air insulating window 63 of the spacer 60 is drilled to form an air in/out hole 71 in the reflective plate 70.

Here, when manufacturing the reflective plate 70 having the air inlet and outlet holes 71 formed, an example of forming the air inlet and outlet holes 71 by punching out a metal plate to manufacture the reflective plate 70 was disclosed, but limited to this no. For example, the reflector 70 may be manufactured by punching after the metal plate is punched to form the air in/out hole 71. Alternatively, punching and punching of the metal plate may be performed together to manufacture the reflective plate 70 in which the air inlet and outlet holes 71 are formed.

At this time, an example in which the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflecting plate 70 proceeds in order has been disclosed, but is not limited thereto. For example, the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflector 70 may be performed regardless of the order. Alternatively, the manufacturing process of the heating element film 10, the manufacturing process of the spacer 60, and the manufacturing process of the reflector 70 may be performed in parallel.

And after the heating element film 10, the spacer 60 from which the release film has been removed, and the metal plate 70 are sequentially stacked, the film radiation heater 200 according to the second embodiment is manufactured through a lamination or hot pressing process. .

Meanwhile, in the first embodiment, an example in which air in/out holes 11 are formed in the heating element film 10 and the protective film 80 stacked above the spacer 60 is disclosed, and in the second embodiment, the spacer 60 An example in which the air inlet and outlet holes 71 are formed in the reflective plate 70 stacked on the lower portion with the center of) is disclosed, but the present invention is not limited thereto. For example, air in/out holes 11 and 71 may be formed in the heating element film 10 and the protective film 80 stacked with each other around the spacer 70 and the reflective plate 70, respectively.

[Experimental Example and Comparative Example]

In order to confirm the characteristics of the film radiation heater according to the first embodiment, the following experiment was performed.

7 is a plan view showing a first experimental example of the film radiation heater according to the first embodiment of the present invention.

Referring to FIG. 7, in the film radiation heater according to the first experimental example, one air inlet and outlet hole 11 is formed in each of the plurality of air insulating windows 63 formed by the spacers 60. An aluminum foil was used as a reflector.

8 is a thermal image of the film radiation heater of FIG. 7. 9 is a graph showing the heating behavior of the film radiation heater of FIG. 7. Here, FIG. 8 is a thermal image of the film radiation heater according to the first experimental example when DC 24V is driven. 9 shows the heating behavior of the film radiation heater according to the first experimental example when DC 24V is driven. Ar1 to Ar4 represent a planar heating element.

8 and 9, it can be seen that the film radiation heater according to the first experimental example rapidly reaches the saturation temperature within 200 seconds.

Table 1 shows the heat output and heat density values of the film radiation heater according to the first experimental example when DC 24V is driven.

Measurement time [s] DC drive voltage [V] Electromotive current [A] Heat output [W] Heat density (W/cm ² ) 1800 24 3.579 85.907 0.111

In addition, since the film radiation heater according to the first experimental example had air inlet and outlet holes formed, volume expansion of the heating element film and the reflector was not observed during the experiment by applying DC 24V.

10 is a graph showing a temperature change of a heat receiving unit of the film radiation heater of FIG. 7.

Referring to FIG. 10, a result of measuring a temperature change of a heat receiving unit when the film radiation heater according to the first experiment is driven at DC 24V.

In general, a radiation heater is a radiation heater that heats a heat receiving part (a part to be heated) such as a human body and an outer wall by far infrared rays. Therefore, in order to evaluate the heating effect of the film radiation heater according to the first experimental example, the heating behavior of the heater itself as well as the heating effect of the heat receiving unit were evaluated together.

In order to evaluate the heating effect, the film radiation heater according to the first experimental example is attached to one side of the black box. Install a heat receiving part (1cm thick silicon pad) at a location 20cm away from the film radiation heater. In addition, temperature changes were measured by installing temperature sensors on the front and back of the heat receiving unit. It was confirmed that the heat receiving part also reached the saturation temperature within 200 seconds, similar to the film radiation heater according to the first experimental example.

Next, in order to check the heat generation characteristics due to lamination of a spacer and a reflective plate on the rear surface of the heating element film, a film radiation heater according to the Comparative Example and the second experimental example was manufactured.

As the film radiation heater according to the comparative example, only the heating element film was used. The film radiation heater according to the second experimental example includes a heating element film, a spacer, and a reflector. The thermal image and the heating behavior of the film radiant heater when driving DC 12V were measured.

11 is a thermal image of a film radiation heater according to a comparative example. 12 is a graph showing the heating behavior of the film radiation heater of FIG. 11.

13 is a thermal image of a film radiation heater according to a second experimental example of the first embodiment of the present invention. 14 is a graph showing the heating behavior of the film radiation heater of FIG. 13.

11 to 14, as a result of comparing the thermal image and the heating behavior, the heating temperature of the film radiation heater according to the second experimental example in which the spacer and the reflector were stacked was about 15 despite the same DC 12V being applied. It can be seen that it appears higher than ℃. It is judged that the air insulation due to the spacer between the heating element film and the reflector and the far-infrared rays are not lost to the rear side, but are reflected back to the front side, indicating a high temperature.

In addition, since the film radiation heater according to the second experimental example had air inlet and outlet holes formed, volume expansion of the heating element film and the reflector was not observed during the experiment by applying DC 12V.

On the other hand, the embodiments disclosed in the specification and drawings are only presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those of ordinary skill in the art that other modifications based on the technical idea of the present invention may be implemented in addition to the embodiments disclosed herein.

10: heating element film
11, 71: air inlet and outlet holes
20: base film
21: rear
23: front
30: electrode wiring pattern
33: electrode terminal
35: electrode pad
40: planar heating element
50: cover layer
60: spacer
61: interior space
63: air insulation window
65: border frame
67: inner frame
70: reflector
80: protective film
100, 200: film radiant heater

Claims (12)

A heating element film including a plurality of planar heating elements based on a carbon material that generates heat by receiving power to emit radiant heat and far-infrared rays;
A spacer stacked on the rear surface of the heating element film and having a plurality of air insulating windows; And
A reflective plate that is stacked on a rear surface opposite to the front surface of the spacer on which the heating element film is stacked, and reflects radiant heat and far-infrared rays emitted from the heating element film toward the spacer toward the heating element film;
Film radiation heater comprising a. The method of claim 1,
The heating element film is a film radiation heater, characterized in that the plurality of planar heating elements are arranged on a plane. The method of claim 2,
The spacer is a film radiation heater, characterized in that provided with the plurality of air insulation windows formed in a grid shape. The method of claim 3, wherein the spacer,
A border frame forming an inner space; And
An inner frame connected to the frame frame to divide the inner space into a grid to form the plurality of air insulated windows;
Film radiation heater comprising a. The method of claim 3,
Film radiation heater, characterized in that the area of the air insulation window is larger than the area of the planar heating element. The method of claim 5,
Each of the plurality of planar heating elements is disposed inside the air insulation window. The method of claim 6,
Film radiation heater, characterized in that at least one air inlet and outlet holes connected to the plurality of air insulation windows are formed in the heating element film. The method of claim 7,
The at least one air inlet and outlet holes are film radiation heater, characterized in that formed to be spaced apart from the plurality of planar heating elements. The method of claim 6,
Film radiation heater, characterized in that at least one air inlet and outlet holes connected to the plurality of air insulation windows are formed in the reflector. The method of claim 1,
The carbon material is a film radiation heater, characterized in that it contains at least one of carbon black, carbon nanotubes, graphite, and activated carbon. A heating element film including a plurality of planar heating elements based on a carbon material that generates heat by receiving power to emit radiant heat and far-infrared rays;
A spacer stacked on the rear surface of the heating element film and having a plurality of air insulating windows; And
Including; a reflector laminated on a rear surface opposite to the front surface of the spacer on which the heating element film is stacked, and reflecting radiant heat and far-infrared rays emitted from the heating element film toward the spacer toward the heating element film,
Film radiation heater, characterized in that at least one of the heating element film and the reflecting plate has at least one air inlet and outlet holes respectively connected to the plurality of air insulating windows. The method of claim 11, wherein the heating element film,
A base film on which the spacers are laminated on the rear surface;
An electrode wiring pattern formed on the entire surface of the base film;
The plurality of planar heating elements formed on the front surface of the base film to be connected to the electrode wiring pattern, and generating heat by receiving power through the electrode wiring pattern; And
Includes; a cover layer covering the entire surface of the base film on which the plurality of planar heating elements are formed,
When the air discharge hole is formed in the heating element film, the air discharge hole is formed through the electrode wiring pattern and the base film and the cover layer spaced apart from the plurality of planar heating elements. .

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