KR102375428B1 - Radiation heater assembly - Google Patents

Abstract

The present invention relates to a radiation heater assembly, which rapidly emits high radiation heat with low power and suppresses low-temperature burns caused by contact. The present invention provides a radiant heater assembly comprising a first frame, a heating element film, and a reflector plate. The first frame has a lower surface and an upper surface opposite the lower surface. The heating element film is attached to the upper surface of the first frame, and is provided with a plurality of planar heating elements for emitting radiant heat by receiving power. And the reflecting plate is disposed under the lower surface of the first frame to form an air layer between the heating element films, and reflects the radiant heat emitted from the heating element film toward the first frame.

Description

Radiation heater assembly

The present invention relates to a radiant heater using radiant heat, and more particularly, to a radiant heater assembly having a heating element film emitting high radiant heat with low power of DC 8 to 18V.

As environmental regulations such as exhaust gas and fuel economy regulations in the automobile sector are strengthened every year, the growth of eco-friendly vehicles such as electric vehicles and hybrid vehicles has become a reality. Also, since the solution for diesel vehicles has disappeared due to Volkswagen's Dieselgate, the electric vehicle market is expected to show growth that exceeds experts' expectations.

Despite the rapid growth of the electric vehicle market, one of the technical problems to be solved is maximizing heating efficiency in a low-temperature environment. In other words, since an electric vehicle is a vehicle whose main power source is electric energy through a battery without an engine, a separate heat source for heating such as a heater is required. When an electric vehicle is exposed to the external environment in winter for a long time, the demand for a heater (hereinafter referred to as a 'radiation heater') by radiant heat on the driver's lap, that is, at the place closest to the driver (hereinafter referred to as 'radiation heater') increases, to increase the driver's driving convenience. there is.

Radiant heaters are used in various environments other than electric vehicles, for example, mounted under a desk in an office or installed on a wall.

A PTC element (Positive Temperature Coefficient Element) may be used as a heat source of such a radiant heater. The PTC element generates resistance heat when current is supplied, so it can be used as a heating element, and when the temperature rises due to heat generation and reaches a specific temperature, the resistance value rapidly increases and the flow of current is suppressed, thereby stopping heat generation.

However, the radiant heater using the PTC element has problems in that the power consumption is high, the heating efficiency is lowered compared to the power used, and the temperature increase rate is slow.

Patent Publication No. 2016-0039415 (2016.04.11.)

Accordingly, it is an object of the present invention to provide a radiant heater assembly that emits high radiant heat with low power.

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

Another object of the present invention is to provide a radiation heater assembly capable of suppressing low-temperature burns due to prolonged contact.

In order to achieve the above object, the present invention provides a first frame having a lower surface and an upper surface opposite to the lower surface; a heating element film attached to the upper surface of the first frame, the heating element film having a plurality of planar heating elements emitting radiant heat by receiving power; and a reflector disposed under the lower surface of the first frame to form an air layer between the heating element films and to reflect radiant heat emitted from the heating element film toward the first frame.

The radiation heater assembly according to the present invention may further include a mesh-type assembly plate interposed between the first frame and the reflection plate to form an air layer.

The opening ratio of the mesh-type assembly plate may be 40% or more.

The mesh-type assembly plate has an open side with respect to a surface facing the first frame and the reflection plate.

The first frame and the mesh-type assembly plate are made of a plastic material.

The mesh-type assembly plate may be integrally formed with the first frame on a lower surface of the first frame.

The heating element film may include a base substrate having a lower surface attached to the upper surface of the first frame; an electrode wiring pattern made of a metal material formed on an upper surface of the base substrate; The plurality of planar heating elements formed by printing a heating element composition to be connected to the electrode wiring pattern on the upper surface of the base substrate, and generating heat by receiving power through the electrode wiring pattern; and a cover layer sealing the upper surface of the base substrate on which the plurality of planar heating elements are formed and discharging heat generated from the plurality of planar heating elements.

The plurality of planar heating elements may be formed by printing a heating element composition containing carbon nanotube particles and graphite particles as conductive particles.

The heating element composition for forming the plurality of planar heating elements includes hexamethylene diisocyanate, polyvinyl acetal and a phenol-based resin, or a mixed binder containing epoxy acrylate, polyvinyl acetal and a phenol-based resin; and the conductive particles further comprising a silver powder, a silver-coated nickel powder, or a silver-coated copper powder.

The radiation heater assembly according to the present invention may further include a decorative film attached to the upper surface of the heating element film.

The radiation heater assembly according to the present invention may further include a second frame attached to the lower surface of the reflector.

The first frame may form an outer surface of the glove box, and the second frame may form an inner surface of the glove box.

The present invention also provides a first frame having a lower surface and an upper surface opposite to the lower surface; a heating element film attached to the upper surface of the first frame, the heating element film having a plurality of planar heating elements emitting radiant heat by receiving power; a mesh-type assembly plate laminated on the lower surface of the first frame and having porosity; and a reflecting plate laminated on the mesh-type assembly plate to face the lower surface of the first frame and reflecting the radiant heat emitted from the heating element film toward the first frame.

The present invention also provides a first frame having a lower surface and an upper surface opposite to the lower surface; A heating element composition that is attached to the upper surface of the first frame and includes a plurality of planar heating elements that generate heat by receiving power and emit radiant heat, wherein the plurality of planar heating elements are conductive particles and contain carbon nanotube particles and graphite particles a heating element film formed by printing; a decorative film attached to the upper surface of the heating element film; a mesh-type assembly plate laminated on the lower surface of the first frame and having porosity; a reflective plate laminated on the mesh-type assembly plate to face the lower surface of the first frame and reflecting radiant heat emitted from the heating element film toward the first frame; and a second frame attached to the lower surface of the reflector.

Since the radiation heater assembly according to the present invention includes a heating element film having a planar heating element that can be driven with low power of DC 8 to 18V, it is possible to heat a large area in a short time with low power, so that high radiant heat can be radiated.

Since the radiation heater assembly according to the present invention is implemented in the form of a film, it can be easily attached or mounted to various objects, such as a car interior, a lower part of a desk in an office, or a wall surface.

In the radiation heater assembly according to the present invention, by attaching a decorative film to the surface of the heating element film exposed to the outside, harmony with an object or the surrounding environment or aesthetics can be improved.

Since the planar heating element of the heating element film has a large heating area compared to a general PTC device, heat loss in the heat transfer process can be minimized.

Since the planar heating element of the heating element film can be designed in various ways through the printing process, the heating element film can be manufactured to be driven at various driving voltages usable in the device or environment in which the radiant heater assembly according to the present invention is used.

Since the planar heating element of the heating element film is formed of a heating element composition in the form of a paint containing conductive particles and a mixed binder, it has low specific resistance and excellent thermal conductivity, which is advantageous for low voltage driving and has the advantage of fast temperature increase. That is, since the heating element composition includes a mixed binder including hexamethylene diisocyanate or epoxy acrylate, polyvinyl acetal, and a phenol-based resin together with the conductive particles, heat resistance can be maintained even at a temperature of 200° C. or higher. For this reason, the radiant heater according to the present invention can provide a radiant heater having a planar heating element having a small resistance change according to temperature and high heat generating behavior and stability.

Since the planar heating element formed of the heating element composition including carbon nanotube particles and graphite particles is a black body, the radiation heater according to the present invention can obtain additional energy efficiency improvement due to blackbody radiation. Since the radiation heater according to the present invention also radiates far-infrared rays due to blackbody radiation, it is possible to provide beneficial far-infrared rays to the user. In addition, when a radiation plate having a ceramic layer emitting far-infrared radiation is installed on the heating element film, the amount of far-infrared radiation can be further increased.

The heating element composition has a low specific resistance and easy thickness control, so that it is possible to provide a radiant heater capable of high-temperature heating with low voltage and low power.

Since the heating element composition can perform screen printing, roll-to-roll gravure printing, roll-to-roll comma coating, flexographic printing, and offset printing, it is advantageous for mass production of the radiant heater according to the present invention, as well as to eliminate restrictions on product length and area. can

And since the radiation heater assembly according to the present invention has a structure in which the mesh-type assembly plate and the reflector are disposed on the side opposite to the direction in which the radiation is emitted, the radiation efficiency in the direction in which the radiation is emitted can be increased, and the radiation efficiency can be increased in the direction in which the radiation is emitted for a long time. It is possible to suppress low-temperature burns caused by

1 is a plan view showing a radiation heater assembly according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 .
3 is a plan view illustrating a unit heating element of a heating element film according to Experimental Examples 1 to 4;
4 to 7 are graphs showing changes in electromotive current and heating temperature of the unit heating element according to the first to fourth experimental examples.
8 is a flowchart illustrating a method of manufacturing a radiant heater assembly according to a first embodiment of the present invention.
9 to 11 are photographs showing the steps of attaching the heating element film and the decorative film in the method of manufacturing the radiation heater assembly according to the first embodiment of the present invention.
12 is a photograph showing an example in which the radiation heater assembly manufactured by the manufacturing method of FIG. 8 is implemented as a glove box.
13 and 14 are thermal image images of the radiation heater assembly of FIG. 12 .
15 is a thermal image of a radiant heater assembly according to a second embodiment of the present invention implemented as a steering wheel column.
FIG. 16 is a graph showing a change in heating temperature according to time during DC 12V driving of the radiant heater assembly of FIG. 15 .

It should be noted that, in the following description, only the parts necessary for understanding the embodiments of the present invention will be described, and descriptions of other parts will be omitted in the scope not disturbing the gist of the present invention.

The terms or words used in the present specification and claims described below should not be construed as being limited to their ordinary or dictionary meanings, and the inventors have appropriate concepts of terms to describe their invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be variations and variations.

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

[First embodiment]

1 is a plan view showing a radiation heater assembly according to a first embodiment of the present invention. And FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 . In order to show the heating element film 20 in FIG. 1 , the illustration of the decorative film 60 attached to the upper surface of the heating element film 20 is omitted.

1 and 2 , the radiation heater assembly 100 according to the first embodiment includes a first frame 11 , a heating element film 20 , and a reflection plate 80 . The first frame 11 has a lower surface 13 and an upper surface 15 opposite the lower surface 13 . The heating element film 20 is attached to the upper surface 15 of the first frame 11, and includes a plurality of planar heating elements 51 that generate heat by receiving power to emit radiant heat. And the reflective plate 80 is disposed under the lower surface 13 of the first frame 11 to form an air layer between the heating element films 20, and radiant heat emitted from the heating element film 20 to the first frame 11 reflect towards The radiation heater assembly 100 according to the first embodiment may further include a decorative film 60 , a mesh-type assembly plate 70 , and a second frame 19 .

Here, the first frame 11 is a base layer to which the heating element film 20 is attached. For example, when the radiation heater assembly 100 according to the first embodiment is implemented as a glove box, the first frame 11 may be a part forming the outer surface of the glove box exposed to the interior of the vehicle.

A plastic material capable of injection molding may be used as a material of the first frame 11 . For example, when the radiation heater assembly 100 according to the first embodiment is implemented as a glove box, the first frame 11 may be made of a plastic material used as an interior material of a vehicle.

The heating element film 20 is attached to the upper surface 15 of the first frame 11 via the first adhesive layer 91 . Acryl-based, epoxy-based, polyimide-based or urethane-based material may be used for the first adhesive layer 91 . In a state in which the adhesive forming the first adhesive layer 91 is applied to the lower surface of the heating element film 20 or the upper surface 15 of the first frame 11 , the heating element film 20 and the first frame 11 are By applying heat and pressure to the liver, the heating element film 20 may be attached to the upper surface 15 of the first frame 11 .

The heating element film 20 includes a base substrate 30 , an electrode wiring pattern 40 , a plurality of planar heating elements 51 and a cover layer 53 . The base substrate 30 is a base layer capable of forming the electrode wiring pattern 40 , the plurality of planar heating elements 51 and the cover layer 53 . The electrode wiring pattern 40 is formed on the upper surface 33 of the base substrate 30 and may be formed of a metal material. The plurality of planar heating elements 51 are formed by printing a heating element composition on the electrode wiring pattern 40 of the upper surface 33 of the base substrate 30 , and receive power through the electrode wiring pattern 40 to generate heat. And the cover layer 53 seals one surface of the base substrate 30 on which the plurality of planar heating elements 51 are formed, and heat generated from the plurality of planar heating elements 51 is emitted.

The base substrate 30 has a lower surface 31 and an upper surface 33 opposite to the lower surface 31 . A lower surface 31 of the base substrate 30 is bonded to an upper surface 15 of the first frame 11 . An electrode wiring pattern 40 , a plurality of planar heating elements 51 and a cover layer 53 are formed on the upper surface 33 of the base substrate 30 . A plastic substrate may be used as the base substrate 30 . Materials of the plastic substrate include polyimide, polyethersulphone (PES), polyacrylate (PAR), polyacrylonitrile (PAN), polyetherimide (PEI), polyethylene Naphthalate (polyethyelenen napthalate; PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate (polyallylate), polycarbonate (PC), cellulose triacetate (CTA) ), polyurethane (PU), silicone or cellulose acetate propionate (CAP) may be used, but not limited to those listed.

The material of the base substrate 30 may be appropriately selected according to the application field in which the radiation heater assembly 100 is used or the heating temperature.

The electrode wiring pattern 40 is formed on the upper surface 33 of the base substrate 30 , and supplies power applied from the outside to the planar heating element 51 . The electrode wiring pattern 40 may be formed of a metal material to minimize a voltage drop. As a metal material for forming the electrode wiring pattern 40 , silver, aluminum, copper, nickel, stainless steel, or an alloy thereof may be used.

The electrode wiring pattern 40 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 40 may be formed by laminating a metal foil on the upper surface 33 of the base substrate 30 and then patterning it by an etching method. Alternatively, the electrode wiring pattern 40 may be formed by printing a metal paste on the upper surface 33 of the base substrate 30 .

These electrode wiring patterns 40 are respectively connected in parallel to the plurality of planar heating elements 51 to apply power. The electrode wiring pattern 40 includes a first electrode pad 41 , a first connection wiring 42 , a plurality of first electrode terminals 43 , a second electrode pad 46 , a second connection wiring 47 , and and a plurality of second electrode terminals 48 .

The first electrode pad 41 and the second electrode pad 46 are respectively connected to the positive electrode and the negative electrode of the battery via the first cable 44 and the second cable 49 to receive power. The first electrode pad 41 and the second electrode pad 46 are formed to be spaced apart from the plurality of planar heating elements 51 . Although the example in which the first electrode pad 41 and the second electrode pad 46 are formed at positions spaced apart from the region in which the plurality of planar heating elements 51 are arranged is disclosed, the present invention is not limited thereto. As will be described later, the first electrode pad 41 and the second electrode pad 46 protrude out of the cover layer 53 to receive power.

The first connection wiring 42 is connected to the first electrode pad 41 , and is formed along the direction in which the plurality of planar heating elements 51 are arranged on one side of the plurality of planar heating elements 51 .

The plurality of first electrode terminals 43 are connected to the first connection wiring 42 , and are respectively formed under the plurality of planar heating elements 51 .

The second connection wiring 47 is connected to the second electrode pad 46 , and is formed along the direction in which the plurality of planar heating elements 51 are arranged on the other side of the plurality of planar heating elements 51 . Due to this, the first connection wiring 42 and the second connection wiring 47 formed on the plurality of planar heating elements 51 may be formed in parallel with the plurality of planar heating elements 51 interposed therebetween.

And the plurality of second electrode terminals 48 are connected to the second connection wiring 47 , respectively formed under the plurality of planar heating elements 51 , and are formed to be spaced apart from the plurality of first electrode terminals 43 . . The first and second electrode terminals 43 and 48 may be formed parallel to each other. At this time, the plurality of planar heating elements 51 receive power from the battery through the first electrode terminal 43 and the second electrode terminal 48 to generate heat.

The plurality of planar heating elements 51 are respectively formed to connect the first and second electrode terminals 43 and 48 of the electrode wiring pattern 40 . The planar heating element 51 is formed by printing the heating element composition to connect the first and second electrode terminals 43 and 48, 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, etc. may be used. Drying and curing may be performed at 100°C to 180°C.

The planar heating element 51 is formed to be arranged in a horizontal direction on the base substrate 30 . That is, the planar heating element 51 may be formed on the upper surface 33 of the base substrate 30 in n rows and m columns (n, m is a natural number greater than or equal to 2). At this time, the electrode wiring pattern 40 is formed to connect the plurality of planar heating elements 51 formed on the upper surface 33 of the base substrate 30 in parallel.

The heating element composition forming the planar heating element 51 includes a mixed binder and conductive particles. In order to form the planar heating element 51, the heating element composition input to the printing process further includes an organic solvent and a dispersant in addition to the mixed binder and conductive particles.

The heating element composition may include 5 to 30 parts by weight of the mixed binder, 0.7 to 60 parts by weight of the conductive particles, 29 to 80 parts by weight of the organic solvent, and 0.5 to 5 parts by weight of the dispersant based on 100 parts by weight of the heating element composition.

The conductive particles include carbon particles or metal powders having conductivity. As the carbon particles, carbon nanotube particles or graphite particles may be used. As the metal powder, a powder made of silver, copper, or nickel may be used. For example, the conductive particles may include 0.1 to 5 parts by weight of carbon nanotube particles, 0.1 to 20 parts by weight of graphite particles, or 10 to 60 parts by weight of metal powder based on 100 parts by weight of the heating composition.

The carbon nanotube particles may be selected from single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, or mixtures thereof. For example, the carbon nanotube particle may be a multi-wall carbon nanotube. When the carbon nanotube particles are multi-walled carbon nanotubes, the diameter may be 1 nm to 20 nm, and the length may be 1 μm to 100 μm.

The graphite particles may have a diameter of 1 μm to 25 μm, and a thickness of 1 nm to 25 μm.

Metal powders include powders made of silver, copper or nickel. In the case of silver powder, it may have the form of flakes, a sphere, a polygonal plate shape, a rod, or the like. As the copper powder, silver-coated copper (Ag coated Cu) powder, nickel-coated copper (Ni coated Cu) powder, or the like may be used. In addition, silver-coated nickel (Ag coated Ni) powder may be used as the nickel powder.

When the planar heating element 51 is formed with the heating element composition including carbon particles and metal powder, the metal powder forms a main electrical network, and the space between the metal powders is filled with carbon particles to form a three-dimensional random network structure.

As such, the heating element composition includes carbon particles and metal powder, thereby increasing the energy efficiency and heating rate of the planar heating element 51 . That is, the metal powder does not have a blackbody radiation function. However, by including carbon particles in the heating element composition, a blackbody radiation function can be implemented. Due to the carbon particles, the heat resistance of the planar heating element 51 can be improved. And due to the carbon particles, it is possible to increase the heating rate and energy efficiency of the planar heating element (51).

The specific resistance of the planar heating element 51 may be determined by the content of carbon particles or metal powder in the total solid content. For example, up to the range of 1×10 ^{- 2} Ωcm, specific resistance can be controlled only with carbon particles, but in the area below that, additional introduction of metal powder is required. The planar heating element 51 may have a specific resistance of 9 × 10 ^-2 to 1.1 × 10 ^-3 Ωcm.

The mixed binder includes at least two of a phenol-based resin, an acetal-based resin, an isocyanate-based resin, and an epoxy-based resin to have heat resistance even at a temperature of about 300°C. For example, the mixed binder includes at least two of epoxy, epoxy acrylate, hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin.

For example, the mixed binder may include hexamethylene diisocyanate, polyvinyl acetal and phenolic resin, or may include epoxy acrylate, polyvinyl acetal and phenolic resin. Here, the mixed binder may include 10 to 150 parts by weight of a polyvinyl acetal resin and 100 to 500 parts by weight of a phenolic resin based on 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate. When the phenol-based resin is 100 parts by weight or less based on 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate, heat resistance is lowered, and when it exceeds 500 parts by weight, flexibility of the planar heating element 51 is reduced and brittleness can be strengthened.

By increasing the heat resistance of the mixed binder in this way, even when the planar heating element 51 is heated to a high temperature of about 300 ° C., it is possible to suppress a change in resistance or damage of the planar heating element 51 .

Here, the phenolic resin means a phenolic compound including phenol and phenol derivatives. For example, phenol derivatives include p-cresol, o-Guaiacol, Creosol, Catechol, 3-methoxy-1,2-benzenediol (3- methoxy-1,2-Benzenediol), Homocatechol, Vinylguaiacol, Syringol, Iso-eugenol, Methoxyeugenol, o- Cresol (o-Cresol), 3-methyl-1,2-benzenediol (3-methyl-1,2-Benzenediol), (z) -2-methoxy-4- (1-propenyl) -phenol (( z)-2-methoxy-4-(1-propenyl)-Phenol), 2,6-diethoxy-4-(2-propenyl)-phenol (2,6-dimethoxy-4-(2-propenyl)- Phenol), 3,4-dimethoxy-phenol (3,4-dimethoxy-Phenol), 4-ethyl-1,3-benzenediol (4-ethyl-1,3-Benzenediol), Resole phenol, 4-methyl-1,2-benzenediol (4-methyl-1,2-Benzenediol), 1,2,4-benzenetriol (1,2,4-Benzenetriol), 2-methoxy-6-methylphenol (2-Methoxy-6-methylphenol), 2-methoxy-4-vinylphenol (2-Methoxy-4-vinylphenol) or 4-ethyl-2-methoxy-phenol (4-ethyl-2-methoxy-Phenol) and the like, but is not limited thereto.

The organic solvent is for dispersing the conductive particles and the mixed binder, carbitol acetate, butyl carbotol acetate, DBE (dibasic ester), ethyl carbitol, ethyl carbitol acetate, dipropylene glycol It may be a mixed solvent of two or more selected from methyl ether, cellosolve acetate, butyl cellosolve acetate, butanol, and octanol.

On the other hand, the process for dispersion can be applied various methods commonly used, for example, through ultrasonic treatment (Ultra-sonication), roll mill (Roll mill), bead mill (Bead mill) or ball mill (Ball mill) process can be done

And the dispersing agent is for more smoothly dispersing the conductive particles, and a general dispersing agent used in the art such as BYK, an amphoteric surfactant such as Triton X-100, or an ionic surfactant such as SDS may be used.

In addition, the heating element composition may further include 0.1 to 5 parts by weight of a silane coupling agent as an additive based on 100 parts by weight of the heating element composition.

The silane coupling agent functions as an adhesion promoter to promote adhesion between resins when the heating element composition is formulated. The silane coupling agent may be an epoxy containing silane or a mercapto containing silane. Examples of such silane coupling agents are those containing epoxy 2-(3,4 epoxy cyclohexyl)-ethyltrimethoxysilane, 3-glycidoxytrimethoxysilane, 3-glycidoxypropyltriethoxysilane, There are 3-glycidoxypropyltriethoxysilane, N-2(aminoethyl)3-amitopropylmethyldimethoxysilane containing an amine group, N-2(aminoethyl)3-aminopropyltrimethoxysilane , N-2(aminoethyl)3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilly-N-(1,3-dimethyl There are butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, and 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, and isocyanate containing mercapto. and 3-isocyanate propyltriethoxysilane contained therein, but is not limited thereto.

In addition, the heating element composition may further include 0.5 to 20 parts by weight of ceramic particles as an additive based on 100 parts by weight of the heating element composition. Ceramic particles increase the heat capacity of the planar heating element (51). Glass particles or silicon particles may be used as the ceramic particles.

This heating element film 20 can be driven by applying DC power, and quickly emits high radiant heat with low power of DC 8 to 18V.

And the cover layer 53 is formed to cover the upper surface 33 of the base substrate 30 on which the plurality of planar heating elements 51 are formed. The cover layer 53 has a function of protecting the electrode wiring pattern 40 and the plurality of planar heating elements 51 formed on the upper surface 33 of the base substrate 30 from the external environment, and in the plurality of planar heating elements 51 . It also performs the function of dissipating the generated heat to the outside. In this case, the first electrode pad 41 and the second electrode pad 46 of the electrode wiring pattern 40 protrude out of the cover layer 53 .

As a material of the cover layer 53 , a urethane resin, a silicone resin, an imide-based resin, or a metal foil having an insulating adhesive layer formed on the contact surface with the planar heating element 51 may be used. As a material of the insulating adhesive layer, acrylic, epoxy, polyimide, or urethane-based materials may be used. For example, the cover layer 53 may be bonded to the base substrate 30 by hot pressing or laminating.

The decorative film 60 is attached to the upper surface of the heating element film 20 via the second adhesive layer 93 . Acryl-based, epoxy-based, polyimide-based or urethane-based material may be used for the second adhesive layer 93 .

When the radiation heater assembly 100 according to the first embodiment is implemented as a glove box, the decorative film 60 may be made of plastic, fiber, leather, artificial leather, etc. used as an interior material of a vehicle. The decorative film 60 may have irregularities formed on its surface. The unevenness formed on the surface can give the feeling of leather or textile. The decorative film 60 is advantageous to use a film of a color that does not reduce the far-infrared emissivity, such as black or brown. The decorative film 60 may have a single-layer film or a composite structure of two or more layers.

In a state in which the adhesive forming the second adhesive layer 93 is applied to the lower surface of the decorative film 60 or the upper surface of the heating element film 20, heat and pressure are applied between the heating element film 20 and the decorative film 60 By doing so, it is possible to attach the decorative film 60 to the upper surface of the heating element film 20 . For example, the decorative film 60 may be attached to the upper surface of the heating element film 20 using a three dimension overlay method (TOM).

On the other hand, although the first embodiment discloses an example of attaching the decorative film 60 on the cover layer 513 of the heating element film 20, it is not limited thereto. For example, a decorative film may also serve as a cover layer. That is, after attaching the heating element film on which the cover layer is not formed to the first frame, a decorative film may be attached to cover the upper surface of the base substrate on which the plurality of planar heating elements are formed.

The reflecting plate 80 is disposed below the lower surface 13 of the first frame 11 to be spaced apart from the first frame 11 . That is, the reflector 80 forms an air layer between the first frames 11 . The air layer has a portion connected to the outside so that external air can be introduced into the air layer between the reflector 80 and the first frame 11 .

The reflector 80 reflects the radiant heat emitted to the lower surface 13 of the first frame 11 and radiates it to the upper surface 15 of the first frame 11, and the radiation heater assembly according to the first embodiment ( 100) can improve the radiation efficiency.

And by forming an air layer between the reflective plate 80 and the first frame 11 , it may be more advantageous for surface heating of the first frame 11 due to a small heat capacity, and the surface contact of the first frame 11 . low-temperature burns can be suppressed. That is, since the air layer is formed on the lower surface 13 of the first frame 11 , the air layer uniformly distributes the heat transferred to the first frame 11 , thereby preventing the object from contacting the first frame 11 . Even if it occurs, the low-temperature burn of the object can be suppressed by contact.

As a material of the reflective plate 80, a metal material that reflects radiant heat well may be used. For example, aluminum, stainless steel, or the like may be used as a material of the reflector 80 .

The mesh-type assembly plate 70 is interposed between the first frame 11 and the reflective plate 80 to adjust the ratio of the air layer between the first frame 11 and the reflective plate 80 . That is, the mesh-type assembly plate 70 has porosity. By adjusting the opening ratio of the mesh-type assembly plate 70 , the ratio of the air layer between the first frame 11 and the reflective plate 80 is adjusted.

The mesh-type assembly plate 70 has an open side adjacent to the surface facing the first frame 11 and the reflective plate 80 . This allows external air to be introduced into the mesh-type assembly plate 70 between the reflector 80 and the first frame 11 .

The opening ratio of the mesh-type assembly plate 70 is preferably 40% or more. When the aperture ratio is less than 40%, it hardly contributes to the improvement of the radiant efficiency of radiant heat emitted to the upper surface 15 of the first frame 11 . However, when the aperture ratio is 40% or more, it can be seen that the radiation efficiency of the radiant heat emitted to the upper surface 15 of the first frame 11 is improved. A plastic material having low thermal conductivity may be used as a material of the mesh-type assembly plate 70 .

In this case, the reflective plate 80 may be attached to the lower surface of the mesh-type assembly plate 70 via the third adhesive layer 95 . Acryl-based, epoxy-based, polyimide-based or urethane-based material may be used for the third adhesive layer 95 . In a state in which the adhesive forming the third adhesive layer 95 is applied to the lower surface of the mesh-type assembly plate 70 or the upper surface of the reflection plate 80 , heat and pressure between the mesh-type assembly plate 70 and the reflection plate 80 . By applying the reflective plate 80 may be attached to the lower surface of the mesh-type assembly plate 70 .

Although the mesh-type assembly plate 70 according to the first embodiment is separately manufactured and positioned between the first frame 11 and the reflective plate 80 is disclosed, the present invention is not limited thereto. For example, the mesh-type assembly plate 70 may be integrally formed with the first frame 11 on the lower surface 13 of the first frame 11 . That is, the first frame 11 and the mesh-type assembly plate 70 may be integrally formed through injection molding or double molding.

And the second frame 19 is attached to the lower surface of the reflector 80 via the fourth adhesive layer (97). Acryl-based, epoxy-based, polyimide-based, or urethane-based material may be used for the fourth adhesive layer 97 . In a state in which the adhesive forming the fourth adhesive layer 97 is applied to the lower surface of the reflecting plate 80 or the upper surface of the first frame 19, heat and pressure are applied between the reflecting plate 80 and the second frame 19 By doing so, the second frame 19 can be attached to the lower surface of the reflective plate 80 .

When the radiation heater assembly 100 according to the first embodiment is implemented as a glove box, the second frame 19 may be a part forming the inner surface of the glove box. As a material of the second frame 19 , the same material as that of the first frame 11 may be used.

Meanwhile, in the first embodiment, an example in which the reflector 80 and the second frame 19 laminated on the mesh-type assembly plate 70 are attached via the third and fourth adhesive layers 95 and 97 is disclosed. It is not limited. For example, after laminating the reflective plate 80 and the second frame 19 in contact with the mesh-type assembly plate 70, it may be fixed by a physical coupling method. As the physical coupling method, a fitting method, a magnet attachment method, a screw coupling method, etc. may be used.

In order to confirm the characteristics of the heating element film 20 of the radiation heater assembly 100 according to the first embodiment, the following experiment was performed.

In order to apply the radiation heater assembly 100 according to the first embodiment to a vehicle, the size of the planar heating element 51 when DC 12V is driven, for example, according to the change in the distance between the first and second electrode terminals 43 and 48 Current and exothermic temperature were measured. In order to analyze the electromotive current and heating temperature change according to the size of the planar heating element 51, the unit heating element 20a of the heating element film was implemented in the form shown in FIG.

3 is a plan view showing the unit heating element 20a of the heating element film according to the first to fourth experimental examples.

Referring to FIG. 3 , the unit heating element 20a includes first and second electrode terminals 43 and 48 and a planar heating element 51 connecting the first and second electrode terminals 43 and 48 . The planar heating element 51 has an area of horizontal (X) x vertical (Y). In the unit heating element 20a, illustration of the base substrate is omitted.

The heating element composition was prepared as follows. Carbon nanotubes and graphite particles were added to a carbitol acetate solvent, a dispersant was added, and a carbon nanotube/graphite dispersion (Solution A) was prepared through ultrasonication for 60 minutes. Epoxy acrylate, phenol resin and polyvinyl acetal resin are mixed and added to a carbitol acetate solvent to prepare a master batch (M/B) through mechanical stirring or mechanical kneading that can rotate. . And after kneading Solution A and M/B through physical stirring, a heating element composition was prepared by thoroughly kneading using a 3-roll mill.

The unit heating element 10a was manufactured using the heating element composition prepared by the above-described manufacturing method.

A base substrate made of a urethane material is prepared, a metal paste is screen-printed on the base substrate using a 250 mesh screen mask, and then heat-treated at 150° C. for 30 minutes to form first and second electrode terminals 43 and 48 . After that, the heating element composition is similarly screen-printed along the first and second electrode terminals 43 and 48, and then heat-treated at 150° C. for 30 minutes to form the planar heating element 51. Then, a urethane film (cover layer) having an adhesive layer was hot-pressed, punched, and then wired to prepare a unit heating element 20a.

At this time, the planar heating element 51 was formed by screen printing according to the size of the unit heating element 20a to be used in the first to fourth experimental examples.

The results of analyzing the electromotive current and heating temperature change according to the shape of the planar heating element 51 are shown in FIGS. 4 to 7 . 4 to 7 are graphs showing changes in the electromotive current and the heating temperature of the unit heating element according to the first to fourth experimental examples.

When the Y value was constant at 1 cm, 1.5 cm, 2 cm, and 2.5 cm, respectively, the electromotive current and the heating temperature during DC 12 V driving according to the change of the X value were measured, and the measurement results are graphs shown in FIGS. 4 to 7 . same as Here, FIG. 4 shows a case where the Y value is 1 cm, FIG. 5 shows a case where the Y value is 1.5 cm, FIG. 6 shows a case where the Y value is 2 cm, and FIG. 7 shows a case where the Y value is 2.5 cm. For the four Y values, the X values are 2cm, 2.5cm, 3cm, 3.5cm, 4cm, and 4.5cm, respectively.

4 to 7, it can be seen that the planar heating element increases the electromotive current and the heating temperature as the value of X decreases. In the planar heating element, it can be seen that the electromotive current and the heating temperature change in various ways according to the change of the X value and the Y value. In particular, it can be confirmed that the planar heating element generates heat at 100° C. or more when the X value is 4 cm or less.

Therefore, in the case of manufacturing a radiant heater assembly driven by DC 12V, the heating temperature and power amount can be freely designed by adjusting the area of the planar heating element.

A method of manufacturing the radiation heater assembly 100 according to the first embodiment will be described with reference to FIGS. 1, 2 and 8 . Here, FIG. 8 is a flowchart illustrating a method of manufacturing the radiant heater assembly 100 according to the first embodiment of the present invention.

First, in step S10, the reflective plate 80 is attached to the upper surface of the second frame 19 via the fourth adhesive layer 97 and laminated.

Next, the mesh-type assembly plate 70 is laminated on the upper surface of the reflective plate 80 in step S20. In this case, the mesh-type assembly plate 70 may be laminated on the upper surface of the reflective plate 80 by attaching it to the third adhesive layer 95 as a medium, or may be laminated by bonding in a physical fixing method.

Next, the first frame 11 is laminated on the upper surface of the mesh-type assembly plate 70 in step S30. At this time, the first frame 11 may be laminated by attaching the first frame 11 to the upper surface of the mesh-type assembly plate 70 through an adhesive layer or by bonding in a physical fixing method.

Next, in step S40, the heating element film 20 is attached to the upper surface of the first frame 11 through the first adhesive layer 91 and laminated.

Then, in step S50, the decorative film 60 is attached to the upper surface of the heating element film 20 via the second adhesive layer 93 .

And by trimming the decorative film 60 to fit the shape of the first frame 11 in step S60, the radiation heater assembly 100 according to the first embodiment is obtained.

On the other hand, in the first embodiment, the reflecting plate 80, the mesh-type assembly plate 70, the first frame 11, the heating element film 20 and the decorative film 60 are sequentially laminated on the second frame 19 and copied. Although an example of manufacturing the heater assembly 100 has been disclosed, it is not limited thereto. For example, after laminating the heating element film 20 and the decorative film 60 on the upper surface 15 of the first frame 11 , the mesh-type assembly plate 70 on the lower surface 13 of the first frame 11 . ), the reflector 80 and the second frame 19 may be stacked to manufacture the radiation heater assembly 100 . Alternatively, a first semi-finished product is manufactured by sequentially stacking a reflective plate 80 and a mesh-type assembly plate 70 on the second frame 19 , and a heating element film 20 is formed on the upper surface 15 of the first frame 11 . After the second semi-finished product is manufactured by sequentially stacking the decorative film 60 and the decorative film 60 , the radiation heater assembly 100 may be manufactured by stacking the first semi-finished product and the second semi-finished product with each other.

An example of implementing the method of manufacturing the radiation heater assembly according to the first embodiment as a glove box will be described with reference to FIGS. 9 to 12 . 9 to 11 are photographs showing the steps of attaching the heating element film and the decorative film in the method of manufacturing the radiation heater assembly according to the first embodiment of the present invention. And FIG. 12 is a photograph showing an example in which the radiation heater assembly manufactured by the manufacturing method of FIG. 8 is implemented as a glove box.

First, as shown in FIG. 9, the heating element film is attached to the upper surface of the first frame forming the upper surface of the glove box.

Next, as shown in FIGS. 10 and 11, a decorative film is attached to cover the upper surface of the first frame to which the heating element film is attached. The decorative film is attached by the TOM method, but is attached by applying pressure at a temperature of around 110℃.

And, as shown in Figure 12, by trimming the decorative film to fit the shape of the first frame, it is possible to manufacture a glove box with a built-in heating element film. 12A shows a first glove box to which a brown decorative film is attached. 12 (b) shows a second glove box to which a black colored decorative film is attached.

As described above, the heating behavior and electrical characteristics of the radiation heater assembly according to the first embodiment implemented as a glove box will be described with reference to FIGS. 13 and 14 . 13 and 14 are thermal images of the radiation heater assembly of FIG. 12 .

13 is a thermal image of the first glove box when DC 12V is driven. 14 is a thermal image of the second glove box when DC 12V is driven.

Referring to FIGS. 13 and 14 , it can be seen that the first and second gloveboxes are very uniformly heated as a whole, even considering that they have a three-dimensional shape rather than a planar shape. And it can be confirmed that there is no damage to the planar heating elements of the heating element film attached to the first and second glove boxes.

Table 1 below shows electromotive currents and output results under DC 12V driving conditions of the first and second glove boxes. It can be seen that the first and second gloveboxes generate an output of about 60W under a DC 12V driving condition.

Measurement time (Sec) Driving voltage (V) electromotive current (A) Output (W) first glove box 300 12 4.939 59.228 2nd glove box 300 12 5.046 60.512

Table 2 shows the emissivity and radiant energy according to the temperature of the first and second glove boxes according to the measurement standard of KFIA-FI-1005, and it can be seen that the emissivity is about 0.92 at 50°C and 100°C. Here, KFIA-FI-1005 is a method of measuring the emissivity and radiant energy of far-infrared rays by an infrared spectrophotometer, and is measured in comparison with a blackbody using an FT-IR Spectrometer.

As described above, since the purpose of the radiation heater assembly according to the first embodiment is to provide a feeling of warmth by radiation to a driver or passengers, rather than providing a feeling of warmth by contact, emissivity is a very important factor.

[Comparison of heat generation characteristics and heating effect of heat receiving part of Example 1 and Comparative Example]

Table 3 below compares the heating characteristics and the heating effect of the heat receiving unit of the radiant heater assembly according to the comparative example and the first embodiment implemented as a glove box. Here, the radiation heater assembly according to the comparative example used a carbon woven heater as a heating element.

input voltage input power surface
Time to reach 70℃ Time to reach 20℃ on the surface of the heat receiving part 10cm away first embodiment DC 12V 60W within 2 minutes within 4 minutes comparative example DC 12V 60W more than 4 minutes within 8 minutes

Table 3 shows that the radiation heater assembly according to the first embodiment and the comparative example was placed in a cold chamber of a -10°C environment and maintained for 4 hours to perform cold soaking. Before inserting the radiation heater assembly, the first and second electrode pads and the power supply were connected, and a k-type temperature sensor was mounted on the surface of the radiation heater assembly.

After 4 hours of cold shock, the power of the cold chamber was turned off, and a heat receiver equipped with a temperature sensor was installed at the same height as the radiation heater assembly at a distance of 10 cm. DC 12V was applied to each of the heating element film and the carbon woven heater of the radiation heater assembly according to the first embodiment and the comparative example to observe the change in the surface temperature of the radiation heater assembly and the temperature of the heat receiving part at a distance of 10 cm, and the results are shown in Table 3 described.

Referring to Table 3, the same DC 12V voltage and the same 60W power were applied. The time for the surface temperature of the radiation heater assembly according to the first embodiment to reach 70°C and the time for the surface of the heat-receiving unit at a distance of 10 cm to reach 20°C were measured within 2 minutes and within 4 minutes. On the other hand, the time for the temperature of the surface of the radiation heater assembly according to the comparative example to reach 70°C and the time for the surface of the heat-receiving unit at a distance of 10 cm to reach 20°C were measured within 4 minutes and within 8 minutes. That is, it can be seen that the heating characteristics and heating effect of the heat receiving unit of the radiation heater assembly according to the first embodiment are superior to those of the radiation heater assembly according to the comparative example.

On the other hand, the carbon woven heater of the radiant heater assembly according to the comparative example requires a manufacturing process such as knitting and plating, so the production cost is high and the carbon woven heater is configured in the fiber. It has a disadvantage that it is high, and it is difficult to attach it to the interior of a vehicle.

[Comparison of heating characteristics and heating effect of heat receiver depending on whether mesh assembly and reflector are installed]

In the radiation heater assembly according to the first embodiment, when the mesh-type assembly and the reflector are installed on the lower surface of the first frame and when they are not installed, the heating characteristics and the heating effect of the heat receiving unit are compared as shown in Table 4 below. . The radiation heater assembly in which the mesh-type assembly and the reflector are installed on the lower surface of the first frame is referred to as a radiation heater assembly according to the 1-1 embodiment. The radiant heater assembly in which the mesh-type assembly and the reflector are not installed on the lower surface of the first frame is referred to as a radiant heater assembly according to the first and second embodiments. A mesh-type assembly having an opening ratio of 50% was used.

input voltage input power surface
Time to reach 70℃ Time to reach 20℃ on the surface of the heat receiving part 10cm away Example 1-2 DC 12V 60W within 2 minutes within 4 minutes Example 1-1 DC 12V 60W Within 1 minute 30 seconds within 3 minutes

Referring to Table 4, the time for the temperature of the surface of the radiation heater assembly according to the 1-1 embodiment to reach 70°C and the time for the surface of the heat-receiving unit at a distance of 10 cm to reach 20°C are within 1 minute and 30 seconds and 3 measured within minutes.

On the other hand, the time for the surface temperature of the radiation heater assembly according to Example 1-2 to reach 70°C and the time for the surface of the heat-receiving unit at a distance of 10 cm to reach 20°C were measured within 2 minutes and within 4 minutes.

Therefore, it can be seen that the heating characteristics and heating effect of the heat receiving unit of the radiation heater assembly according to the 1-1 embodiment are superior to those of the 1-2 embodiment. This is determined to be an effect generated by installing the mesh-type assembly and the reflector on the lower surface of the first frame.

[Comparison of heating characteristics and heating effect of heat-receiving part according to opening ratio of mesh-type assembly plate]

In the radiation heater assembly according to the first embodiment, the heating characteristics and the heating effect of the heat receiving unit according to the opening ratio of the mesh-type assembly plate are compared as shown in Table 5 below.

Aperture rate (%) input voltage input power surface
Time to reach 70℃ Time to reach 20℃ on the surface of the heat receiving part 10cm away 0 DC 12V 60W within 2 minutes within 4 minutes 10 DC 12V 60W within 2 minutes within 4 minutes 20 DC 12V 60W within 2 minutes within 4 minutes 30 DC 12V 60W within 2 minutes within 4 minutes 40 DC 12V 60W Within 1 minute 40 seconds within 3 minutes and 30 seconds 50 DC 12V 60W Within 1 minute 30 seconds within 3 minutes 60 DC 12V 60W Within 1 minute 30 seconds within 3 minutes 70 DC 12V 60W Within 1 minute 30 seconds within 3 minutes

Referring to Table 5, it can be seen that, when the aperture ratio is 30% or less, it is not greatly helpful in improving the efficiency of the radiation heater assembly. When the aperture ratio is 40% or more, it can be seen that the fast-acting properties of the radiant heater assembly are improved. It was confirmed that almost the same effect can be obtained when the aperture ratio is 50% to 70%.

This is considered to be because, when the mesh-type assembly and the reflector are at the lower end of the first frame, the radiation efficiency of radiant heat in one direction is increased and it is more advantageous for surface heating of the radiant heater assembly due to a small heat capacity. In addition, it was confirmed that the risk of low-temperature burns almost disappeared.

[Second embodiment]

Meanwhile, although an example in which the radiation heater assembly according to the first embodiment is implemented as a glove box is disclosed, the present invention is not limited thereto. For example, the radiant heater assembly may be applied to a steering wheel column, console, seat, etc. for an automobile. 15 and 16 , the radiant heater assembly according to the present invention may be implemented as a steering wheel column.

15 is a thermal image of a radiant heater assembly according to a second embodiment of the present invention implemented as a steering wheel column. FIG. 16 is a graph showing a change in heating temperature according to time during DC 12V driving of the radiant heater assembly of FIG. 15 . 15 is a thermal image of the radiation heater assembly according to the second embodiment when DC 12V is driven. 16 shows a change in heating temperature according to a measurement time for each spot of the radiant heater assembly according to the second embodiment.

15 and 16 , it can be seen that, in the radiation heater assembly according to the second embodiment, the surface temperature reaches 100° C. within 50 seconds when DC 12V is applied.

On the other hand, the embodiments disclosed in the present specification and drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

11: first frame 13, 31: lower surface
15, 33: upper surface 19: second frame
20: heating element film 30: base substrate
40: electrode wiring pattern 41: first electrode pad
42: first connection wiring 43: first electrode terminal
44: first cable 46: second electrode pad
47: second connection wire 48: second electrode terminal
49: second cable 51: planar heating element
53: cover layer 60: decorative film
70: mesh-type assembly plate 80: reflector plate
91, 93, 95, 97: adhesive layer 100: radiant heater assembly

Claims (12)

a first frame made of a plastic material having a lower surface and an upper surface opposite to the lower surface and used as a base layer to which a heating element film is attached;
The heating element film attached to the upper surface of the first frame, the heating element film having a plurality of planar heating elements for emitting radiant heat by receiving power; and
It is disposed spaced apart from the first frame under the lower surface of the first frame to form an air layer between the first frames, and reflects radiant heat emitted from the heating element film to the lower surface of the first frame to reflect the second frame. A reflector that transmits to the heating element film through one frame, and the air layer disperses the heat transferred to the first frame between the first frame and the reflector;
The radiation heater assembly, characterized in that the air layer has a portion connected to the outside so that external air can be introduced into the air layer between the reflector and the first frame. According to claim 1,
A mesh-type assembly plate interposed between the first frame and the reflective plate to adjust the ratio of the air layer; further comprising,
The mesh-type assembly plate has a radiant heater assembly, characterized in that adjacent sides are open with respect to a surface facing the first frame and the reflection plate so that external air can be introduced. 3. The method of claim 2,
Radiation heater assembly, characterized in that the opening ratio of the mesh-type assembly plate is 40% or more. 3. The method of claim 2,
The mesh-type assembly plate is a radiant heater assembly, characterized in that the adjacent side with respect to a surface facing the first frame and the reflection plate is open. 3. The method of claim 2,
The first frame and the mesh-type assembly plate are made of a plastic material,
The mesh-type assembly plate is a radiant heater assembly, characterized in that formed integrally with the first frame on the lower surface of the first frame. According to claim 1, wherein the heating element film,
a base substrate having a lower surface attached to the upper surface of the first frame;
an electrode wiring pattern made of a metal material formed on an upper surface of the base substrate;
The plurality of planar heating elements formed by printing a heating element composition to be connected to the electrode wiring pattern on the upper surface of the base substrate, and generating heat by receiving power through the electrode wiring pattern; and
Containing; and a cover layer sealing the upper surface of the base substrate on which the plurality of planar heating elements are formed and the heat generated in the plurality of planar heating elements is emitted;
The plurality of planar heating elements are radiant heater assembly, characterized in that formed by printing a heating element composition containing carbon nanotube particles and graphite particles as conductive particles. According to claim 6, The heating element composition for forming the plurality of planar heating elements,
a mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal and phenolic resin or including epoxy acrylate, polyvinyl acetal and phenolic resin; and
the conductive particles further comprising silver powder, silver-coated nickel powder or silver-coated copper powder;
Radiant heater assembly comprising a. According to claim 1,
a decorative film attached to the upper surface of the heating element film;
Radiant heater assembly further comprising a. According to claim 1,
a second frame attached to the lower surface of the reflector;
Radiant heater assembly further comprising a. 10. The method of claim 9,
wherein the first frame forms an outer surface of the glove box, and the second frame forms an inner surface of the glove box. a first frame made of a plastic material having a lower surface and an upper surface opposite to the lower surface and used as a base layer to which a heating element film is attached;
The heating element film attached to the upper surface of the first frame, the heating element film having a plurality of planar heating elements for emitting radiant heat by receiving power;
a mesh-type assembly plate laminated on the lower surface of the first frame and having porosity; and
It is laminated on the mesh-type assembly plate to face the lower surface of the first frame, and reflects radiant heat emitted from the heating element film to the lower surface of the first frame through the mesh-type assembly plate and the first frame. Including; a reflector that transmits to the heating element film;
The mesh-type assembly plate is interposed between the first frame and the reflector to adjust the ratio of the air layer between the first frame and the reflector, and to disperse heat transferred to the first frame,
The mesh-type assembly plate has a radiant heater assembly, characterized in that adjacent sides are open with respect to a surface facing the first frame and the reflection plate so that external air can be introduced. a first frame made of a plastic material having a lower surface and an upper surface opposite to the lower surface and used as a base layer to which a heating element film is attached;
A heating element composition that is attached to the upper surface of the first frame and includes a plurality of planar heating elements that generate heat by receiving power and emit radiant heat, wherein the plurality of planar heating elements are conductive particles and contain carbon nanotube particles and graphite particles The heating element film formed by printing;
a decorative film attached to the upper surface of the heating element film;
a mesh-type assembly plate laminated on the lower surface of the first frame and having porosity;
It is laminated on the mesh-type assembly plate to face the lower surface of the first frame, and reflects radiant heat emitted from the heating element film to the lower surface of the first frame through the mesh-type assembly plate and the first frame. a reflector that transmits to the heating element film; and
a second frame attached to the lower surface of the reflector; and
The mesh-type assembly plate is interposed between the first frame and the reflector to adjust the ratio of the air layer between the first frame and the reflector, and to disperse heat transferred to the first frame,
The mesh-type assembly plate has a radiant heater assembly, characterized in that adjacent sides are open with respect to a surface facing the first frame and the reflection plate so that external air can be introduced.

Images