KR20190113336A - Radiation heater assembly - Google Patents

Abstract

The present invention relates to a radiant heater assembly for rapidly emitting high radiant heat at low power, and suppressing low-temperature burns caused by contact. The present invention provides the radiant heater assembly comprising a first frame, a heating element film, and a reflection plate. The first frame has a lower surface and an upper surface facing the lower surface. The heating element film is attached to the upper surface of the first frame and has a plurality of planar heating elements which emit heat by receiving power. The reflection plate is disposed below the lower surface of the first frame to form an air layer between 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 that emits high radiant heat at a low power of DC 8 to 18V.

As the 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 cars and hybrid cars has become a true fact. Also, the Volkswagen's diesel gate has lost the solution for diesel vehicles, and the EV market is expected to grow more than experts expect.

Despite the rapid growth of the electric vehicle market, one of technical problems to be solved is maximizing heating efficiency in a low temperature environment. That is, since the electric vehicle is a vehicle that uses electric energy through a battery without an engine, a heat source for heating such as a heater is required separately. When the electric vehicle is exposed to the outside environment for a long time in winter, the demand of a heater by radiant heat (hereinafter referred to as a 'radiation heater') on the knee, which is located at the nearest distance of the driver, to increase the driver's convenience is increased. have.

Radiant heaters are used in addition to electric vehicles in a variety of environments, such as under the desk of the office or installed on the wall.

As a heat source of the radiant heater, a PTC element (Positive Temperature Coefficient Element) may be used. The PTC element can be used as a heating element because resistance heat is generated when a current is supplied, and when the temperature rises due to heat generation and reaches a specific temperature, the resistance value is rapidly increased and the flow of current is suppressed to stop the heat generation.

However, the radiant heater using a PTC device has a problem of high power consumption, low heat generation efficiency, and a slow temperature rising rate.

Publication No. 2016-0039415 (2016.04.11.)

It is therefore an object of the present invention to provide a radiant heater assembly that emits high radiant heat at low power.

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

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

In order to achieve the above object, the present invention comprises a first frame having a lower surface, and an upper surface opposite to the lower surface; A heating element film attached to an upper surface of the first frame and having a plurality of planar heating elements that emit 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 reflecting the radiant heat emitted from the heating element film toward the first frame.

Radiation heater assembly according to the present invention may further include a mesh-shaped assembly plate interposed between the first frame and the reflective plate to form an air layer.

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

The mesh-shaped assembly plate has an adjacent side surface with respect to a surface facing the first frame and the reflecting plate.

The first frame and the mesh-shaped assembly plate are plastic materials.

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

The heating element film may include a base substrate having a lower surface attached to an upper surface of the first frame; An electrode wiring pattern of a metal material formed on an upper surface of the base substrate; A 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 being supplied with power to the electrode wiring pattern; And a cover layer sealing an upper surface of the base substrate on which the plurality of planar heating elements are formed, and emitting 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: a mixed binder containing hexamethylene diisocyanate, polyvinyl acetal and phenolic resin, or an epoxy acrylate, polyvinyl acetal and phenolic resin; And the conductive particles further comprising silver powder, silver coated nickel powder or silver coated copper powder.

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

Radiation heater assembly according to the present invention may further include a second frame attached to the lower surface of the reflecting plate.

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 invention also includes a first frame having a lower surface and an upper surface opposite to the lower surface; A heating element film attached to an upper surface of the first frame and having a plurality of planar heating elements that emit heat by receiving power; A mesh type assembly plate laminated on a lower surface of the first frame and having a porosity; And a reflecting plate stacked on the mesh-shaped assembly plate facing the lower surface of the first frame and reflecting the radiant heat emitted from the heating element film toward the first frame.

The invention also includes a first frame having a lower surface and an upper surface opposite to the lower surface; It is attached to the upper surface of the first frame, and provided with a plurality of planar heating element for generating radiant heat by generating heat by applying power, the plurality of planar heating element is a heating element composition containing carbon nanotube particles and graphite particles as conductive particles Heating element film formed by printing; A decorative film attached to an upper surface of the heating element film; A mesh type assembly plate laminated on a lower surface of the first frame and having a porosity; A reflection plate laminated on the mesh-shaped assembly plate facing 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 a lower surface of the reflecting plate.

Since the radiant heater assembly according to the present invention includes a heating element film having a planar heating element capable of driving at a low power of DC 8 to 18V, a large area can be generated at a short time with low power, thereby radiating high radiant heat.

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

In the radiant heater assembly according to the present invention, by attaching a decorative film to the surface of the heating element film exposed to the outside, it is possible to increase the harmony or aesthetics with the object or the surrounding environment.

Since the planar heating element of the heating element film has a larger heat generating area as compared with a general PTC element, heat loss in the heat transfer process can be minimized.

Since the planar heating element of the heating element film may be variously designed through a printing process, the heating element film may be manufactured to be driven at various driving voltages usable in a 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 coating including conductive particles and a mixed binder, it has a low specific resistance and excellent thermal conductivity, which is advantageous for low voltage driving and has a high temperature rising speed. That is, since the heat generating composition includes a mixed binder containing hexamethylene diisocyanate or epoxy acrylate, polyvinyl acetal, and a phenolic 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 may provide a radiant heater having a planar heating element having a high heat generation behavior and high stability due to a small change in resistance according to temperature.

Since the planar heating element formed of the heating element composition including carbon nanotube particles and graphite particles is a black body, the radiant heater according to the present invention can obtain additional energy efficiency due to black body radiation. Since the radiant heater according to the present invention radiates far infrared rays due to black body radiation, it is possible to provide a far infrared ray which is beneficial to the user. In addition, when installing a radiation plate formed with a ceramic layer that emits far infrared rays on the upper portion of the heating element film, it is possible to further increase the emission amount of far infrared rays.

The heating element composition may provide a radiant heater having low specific resistance and easy thickness control to enable high temperature heat generation with low voltage and low power.

The heating element composition is capable of screen printing, roll-to-roll gravure printing, roll-to-roll comma coating, flexo printing, and offset printing, which not only favors mass production of the radiant heater according to the present invention but also eliminates restrictions on product length and area. Can be.

In addition, since the radiant heater assembly according to the present invention has a structure in which a mesh-shaped assembly plate and a reflecting plate are arranged on the side opposite to the direction in which radiant heat is radiated, the radiant heat can be increased in the radiant direction in the radiant direction and can be used for a long time. Low-temperature burns can be suppressed.

1 is a plan view showing a radiant heater assembly according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1.
3 is a plan view showing a unit heating element of the heating element film according to the first to fourth experimental examples.
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.
8 is a flowchart of a method of manufacturing a radiant heater assembly according to a first embodiment of the present invention.
9 to 11 are photographs showing a step of attaching a heating element film and a decorative film in a method of manufacturing a radiant heater assembly according to a first embodiment of the present invention.
12 is a photograph showing an example in which a radiant heater assembly manufactured by the manufacturing method of FIG. 8 is implemented as a glove box.
13 and 14 are thermal images of the radiant 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 exothermic temperature with time during the DC 12V driving of the radiant heater assembly of FIG. 15.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, it should be noted that the description of other parts will be omitted in a range that does not distract from 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 the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be variations and variations.

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

[First Embodiment]

1 is a plan view showing a radiant heater assembly according to a first embodiment of the present invention. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1. In order to illustrate 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 radiant heater assembly 100 according to the first embodiment includes a first frame 11, a heating element film 20, and a reflecting plate 80. The first frame 11 has a lower surface 13 and an upper surface 15 opposite to the lower surface 13. The heat generating film 20 is attached to the upper surface 15 of the first frame 911 and includes a plurality of planar heating elements 51 that generate heat by applying power to emit radiant heat. The reflective plate 80 is disposed below the lower surface 13 of the first frame 11 to form an air layer between the heating element films 20, and radiates heat radiated from the heating element film 20 to the first frame 11. Reflect toward The radiant heater assembly 100 according to the first embodiment may further include a decorative film 60, a mesh-shaped assembly plate 70, and a second frame 19.

The first frame 11 is a base layer to which the heating element film 20 is attached. For example, when the radiant heater assembly 100 according to the first embodiment is implemented as a glove box, the first frame 911 may be a portion forming an outer surface of the glove box exposed to the vehicle interior.

As the material of the first frame 11, a plastic material capable of injection molding may be used. For example, when the radiant 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 an automobile.

The heating element film 20 is attached to the upper surface 15 of the first frame 11 via the first adhesive layer 91. As the material of the first adhesive layer 91, an acrylic, epoxy, polyimide, or urethane may be used. The heating element film 20 and the first frame 11 in a state where an adhesive for 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. By applying heat and pressure to the liver, the heating element film 20 can 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 on which the electrode wiring pattern 40, the plurality of planar heating elements 51, and the cover layer 53 can be formed. 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 the heating element composition on the electrode wiring pattern 40 on the upper surface 33 of the base substrate 30, and generate heat by applying power to the electrode wiring pattern 40. 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 by the plurality of planar heating elements 51 is released.

The base substrate 30 has a lower surface 31 and an upper surface 33 opposite to the lower surface 31. The lower surface 31 of the base substrate 30 is bonded to the 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. As the base substrate 30, a plastic substrate may be used. Materials for the plastic substrate include polyimide, polyethersulphone (PES), polyacrylate (PAR), polyacrylonitrile (PAN), polyetherimide (PEI), polyethylene Naphthalate (polyethyelenen napthalate; PEN), polyethylene terephthalate (polyethyeleneterepthalate; PET), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cellulose triacetate (CTA) ), Polyurethane (PU), silicone or cellulose acetate propinonate (CAP) may be used, but is not limited to those listed.

The material of the base substrate 30 may be appropriately selected depending on the application field or the heating temperature at which the radiant heater assembly 100 is used.

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. Silver, aluminum, copper, nickel, stainless steel, or an alloy thereof may be used as the metal material for forming the electrode wiring pattern 40.

The electrode wiring pattern 40 can 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 patterning the same 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.

The electrode wiring patterns 40 are connected to the plurality of planar heating elements 51 in parallel to apply power. The electrode wiring pattern 40 may include a first electrode pad 41, a first connection wire 42, a plurality of first electrode terminals 43, a second electrode pad 46, a second connection wire 47, and A plurality of second electrode terminals 48 is included.

The first electrode pad 41 and the second electrode pad 46 are connected to the positive electrode and the negative electrode of the battery via the first cable 44 and the second cable 49, respectively, 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. An example in which the first electrode pad 41 and the second electrode pad 46 are formed at a position spaced apart from a region where the plurality of planar heating elements 51 are arranged is disclosed, but 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 wire 42 is connected to the first electrode pad 41 and is formed along a 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 wires 42 and are formed under the plurality of planar heating elements 51, respectively.

The second connection wire 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. As a result, the first connection wires 42 and the second connection wires 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.

The plurality of second electrode terminals 48 are connected to the second connection wires 47, respectively, and are formed below the plurality of planar heating elements 51, and are spaced apart from the plurality of first electrode terminals 43. . The first and second electrode terminals 43 and 48 may be formed in parallel with each other. In this case, 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 formed to connect the first and second electrode terminals 43 and 48 of the electrode wiring pattern 40, respectively. The planar heating element 51 is formed by printing the heating element composition so as to connect the first and second electrode terminals 43 and 48, and then drying and curing. As the printing method of the heating element composition, screen printing, gravure printing (to roll to roll gravure printing), comma coating (to roll to roll comma coating), flexo, imprinting, offset printing and the like can 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 the 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 an n-row m-line (n, m is two or more natural numbers). In this case, 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 for 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 introduced into the printing process further includes an organic solvent and a dispersant in addition to the mixed binder and the 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.

Conductive particles include carbon particles or metal powder 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 exothermic 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 particles may be multi wall carbon nanotubes. 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.

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 of silver, copper or nickel materials. In the case of silver powder, it may have the form of flakes, spherical shapes, polygonal plates, rods and the like. As the copper powder, silver coated copper powder, nickel coated copper powder, or the like may be used. And nickel powder may be used silver coated nickel (Ag coated Ni) powder.

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

In this way, the heating element composition includes carbon particles and metal powder, whereby the energy efficiency and heat generation rate of the planar heating element 51 can be increased. That is, the metal powder does not have a black body radiation function. However, by including the carbon particles in the heating element composition, it is possible to implement a blackbody radiation function. Due to the carbon particles, the heat resistance of the planar heating element 51 can be increased. And due to the carbon particles, the heat generation rate and energy efficiency of the planar heating element 51 can be increased.

The specific resistance of the planar heating element 51 may be determined by the content of carbon particles or metal powder in the total solids. For example, 1 × 10 ^{- 2} Ω㎝ gamut by adjusting the specific resistance can be one of only carbon particles, the area of the less is the need for additional introduction of the metal powder. The planar heating element 51 may have a specific resistance of 9 × 10 ⁻² to 1.1 × 10 ⁻³ dBm.

The mixed binder includes at least two kinds of phenolic resins, acetal resins, isocyanate resins and epoxy resins so as 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 resins or may include epoxy acrylate, polyvinyl acetal and phenolic resins. Here, the mixed binder may include 10 to 150 parts by weight of polyvinyl acetal resin and 100 to 500 parts by weight of phenolic resin based on 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate. When the phenolic resin is 100 parts by weight or less with respect to 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate, the heat resistance may be lowered. When the phenolic resin is more than 500 parts by weight, the flexibility of the planar heating element 51 may be lowered, leading to brittleness.

By increasing the heat resistance of the mixed binder in this manner, even when the planar heating element 51 is generated at a high temperature of about 300 ° C., the resistance change and breakage of the planar heating element 51 can be suppressed.

Herein, the phenolic resin means a phenolic compound including phenol and a phenol derivative. 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- 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, 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 or 4-ethyl-2-methoxy-phenol (4-ethyl-2-methoxy-Phenol) Such as, but not limited to It is not.

The organic solvent is used to disperse 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 (Butanol) and octanol (Octanol).

On the other hand, the dispersion process can be applied to a variety of commonly used methods, for example through the ultra-sonication (Roll mill), bead mill (Bead mill) or ball mill (Ball mill) process Can be done.

And the dispersing agent is to more smoothly disperse the conductive particles, it is possible to use a conventional dispersing agent used in the art, such as BYK, amphoteric surfactant such as Triton X-100, ionic surfactant such as SDS.

In addition, the heating element composition may further include 0.1 to 5 parts by weight of the 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 the resins in the formulation of the heating element composition. The silane coupling agent may be an epoxy containing silane or a merceto containing silane. Examples of such silane coupling agents include epoxy and include 2- (3,4 epoxy cyclohexyl) -ethyltrimethoxysilane, 3-glycidoxytrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltriethoxysilane, containing amine groups, N-2 (aminoethyl) 3-amitopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane , N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysil-N- (1,3-dimethyl Butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, containing merceto, 3-mercetopropylmethyldimethoxysilane, 3-mercetopropyltriethoxysilane, isocyanate 3-isocyanate propyl triethoxysilane contained, and the like 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. The ceramic particles increase the heat capacity of the planar heating element 51. As such ceramic particles, glass particles or silicon particles may be used.

The heating element film 20 can be driven by applying a DC power supply, and rapidly emits high radiant heat at a low power of DC 8 to 18V.

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 functions to protect 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 an external environment, and the plurality of planar heating elements 51. Together with the function to release the generated heat to the outside. At this time, 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 the material of the cover layer 53, a urethane resin, a silicone resin, an imide resin, or a metal foil having an insulating adhesive layer formed on a contact surface with the planar heating element 51 may be used. Acrylic, epoxy, polyimide or urethane may be used as the material of the insulating adhesive layer. 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. As the material of the second adhesive layer 93, acrylic, epoxy, polyimide, or urethane may be used.

When the radiant 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, and the like, which are used as interior materials of automobiles. The decorative film 60 may have irregularities formed on its surface. Unevenness formed on the surface can give a feeling of leather or fiber. For the decorative film 60, it is advantageous to use a film of a color that does not lower far-infrared emissivity, such as a black or brown system. The decorative film 60 may have a single layer film or a composite structure of two or more layers.

Heat and pressure are applied between the heating element film 20 and the decorative film 60 while the adhesive for 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. Thereby, the decorative film 60 can be attached to the upper surface of the heat generating film 20. For example, the decorative film 60 may be attached to the upper surface of the heating element film 20 by using a three dimension overlay method (TOM).

Meanwhile, in the first embodiment, an example in which the decorative film 60 is attached on the cover layer 513 of the heating element film 20 is disclosed, but is not limited thereto. For example, a decorative film may also serve as a cover layer. That is, after attaching the heating element film in which the cover layer is not formed to the first frame, the 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 reflective plate 80 is disposed below the lower surface 13 of the first frame 11 to be spaced apart from the first frame 11. In other words, the reflective plate 80 forms an air layer between the first frames 11. The air layer has a portion connected to the outside so that outside air can flow into the air layer between the reflector plate 80 and the first frame 11.

The reflector plate 80 reflects the radiant heat emitted to the lower surface 13 of the first frame 11 and emits the radiation to the upper surface 15 of the first frame 11, thereby providing a radiant heater assembly according to the first embodiment. The radiation efficiency of 100) can be improved.

In addition, the reflective plate 80 may form a layer of air between the first frame 11 and thus may be more advantageous for heating the surface of the first frame 11 due to less heat capacity, and the surface contact of the first frame 11 may occur. The low temperature image 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, so that the contact of the object to the first frame 11 is Even if it occurs, the low-temperature image of the object can be suppressed by the contact.

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

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

As for the mesh-shaped assembly board 70, the side which adjoins with respect to the surface which faces the 1st frame 11 and the reflecting plate 80 is opened. This allows external air to flow into the mesh-shaped assembly plate 70 between the reflector plate 80 and the first frame 11.

As for the opening ratio of the mesh type assembly board 70, 40% or more is preferable. If the aperture ratio is less than 40%, it hardly contributes to the improvement of the radiation efficiency of the 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. As a material of the mesh type assembly plate 70, a plastic material having low thermal conductivity may be used.

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. As the material of the third adhesive layer 95, acrylic, epoxy, polyimide, or urethane may be used. Heat and pressure between the mesh-shaped assembly plate 70 and the reflector plate 80 in the state where an adhesive for forming the third adhesive layer 95 is applied to the lower surface of the mesh-shaped assembly plate 70 or the upper surface of the reflective plate 80. By applying this, the reflective plate 80 can be attached to the lower surface of the mesh-shaped assembly plate 70.

The mesh-shaped assembly plate 70 according to the first embodiment is described separately, but the example is positioned between the first frame 11 and the reflecting plate 80, but is not limited thereto. For example, the mesh 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.

The second frame 19 is attached to the lower surface of the reflector 80 through the fourth adhesive layer 97. As the material of the fourth adhesive layer 97, acrylic, epoxy, polyimide, or urethane may be used. Heat and pressure are applied between the reflecting plate 80 and the second frame 19 while the adhesive for 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. As a result, the second frame 19 can be attached to the lower surface of the reflecting plate 80.

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

Meanwhile, in the first embodiment, an example in which the reflective plate 80 and the second frame 19 stacked on the mesh-shaped 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 reflecting plate 80 and the second frame 19 to be in contact with the mesh-shaped assembly plate 70, it may be fixed by a physical coupling method. The physical coupling method may be a fitting method, a magnet attachment method, a screw coupling method, or the like.

In order to check the characteristics of the heating element film 20 of the radiant heater assembly 100 according to the first embodiment as described above was performed.

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

3 is a plan view illustrating 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 width X x length 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 and a dispersant was added to prepare a carbon nanotube / graphite dispersion (Solution A) through ultrasonication for 60 minutes. Epoxyacrylates, phenolic resins, and polyvinyl acetal resins are mixed and added to a carbitol acetate solvent to prepare a master batch (M / B) through mechanical kneading, which allows for mechanical stirring or autorotation. . And after mixing the solution A and M / B through physical stirring, and completely kneaded using a 3-roll mill to produce a heating element composition.

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

A urethane base substrate is prepared, and the metal paste is screen printed on the base substrate using a 250 mesh screen mask, followed by heat treatment at 150 ° C. for 30 minutes to form first and second electrode terminals 43 and 48. Thereafter, the heating element composition is screen printed according to 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. In addition, the urethane film (cover layer) having an adhesive layer was hot pressed, punched, and wired to prepare a unit heating element 20a.

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

The results of analyzing the change in the electromotive current and the heating temperature according to the shape of the planar heating element 51 are as 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 12V driving according to the change of the X value were measured. Same as 4 illustrates a case where the Y value is 1 cm, FIG. 5 illustrates a case where the Y value is 1.5 cm, FIG. 6 illustrates a case where the Y value is 2 cm, and FIG. 7 illustrates a case where the Y value is 2.5 cm. For the four Y values, the X values are 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm, and 4.5 cm, respectively.

4 to 7, it can be seen that in the planar heating element, as the X value decreases, the electromotive current and the heating temperature increase. It can be seen that the planar heating element is variously changed in the electromotive current and the heating temperature according to the change of the X value and the Y value. In particular, the planar heating element can be confirmed that when the X value is 4cm or less, it generates over 100 ℃.

Therefore, when manufacturing a radiant heater assembly driven by DC 12V, it is possible to freely design the heat generation temperature and the amount of power by adjusting the area of the surface heating element.

The method of manufacturing the radiant heater assembly 100 according to the first embodiment will be described with reference to FIGS. 1, 2, and 8 as follows. 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 by the fourth adhesive layer 97 to be laminated.

Next, in step S20 to stack the mesh type assembly plate 70 on the upper surface of the reflecting plate (80). In this case, the mesh type assembly plate 70 may be attached to the upper surface of the reflecting plate 80 by the third adhesive layer 95, or may be laminated by bonding in a physical fixing manner.

Next, the first frame 11 is laminated on the upper surface of the mesh type assembly plate 70 in step S30. In this case, the first frame 11 may be attached to the upper surface of the mesh type assembly plate 70 by an adhesive layer, or may be laminated by bonding in a physical fixing manner.

Next, in operation S40, the heating element film 20 is attached to the upper surface of the first frame 11 by attaching the first adhesive layer 91 to be laminated.

Subsequently, in operation S50, the decorative film 60 is attached to the upper surface of the heating element film 20 through the second adhesive layer 93.

In operation S60, the radiating heater assembly 100 according to the first exemplary embodiment is obtained by trimming the decorative film 60 according to the shape of the first frame 11.

Meanwhile, in the first embodiment, the reflective plate 80, the mesh-shaped assembly plate 70, the first frame 11, the heating element film 20, and the decorative film 60 are sequentially stacked on the second frame 19 to radiate. An example of manufacturing the heater assembly 100 is disclosed, but 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-shaped assembly plate 70 on the lower surface 13 of the first frame 11. ), The reflective plate 80 and the second frame 19 may be stacked to manufacture the radiant heater assembly 100. Alternatively, the first semi-finished product is manufactured by sequentially stacking the reflective plate 80 and the mesh-shaped assembly plate 70 on the second frame 19, and the heating element film 20 is disposed on the upper surface 15 of the first frame 11. After the second semi-finished product is manufactured by sequentially laminating the decorative film 60, the radiant heater assembly 100 may be manufactured by laminating the first semi-finished product and the second semi-finished product.

An example of implementing the glove box by the method of manufacturing the radiant heater assembly according to the first embodiment will be described with reference to FIGS. 9 through 12. 9 to 11 are photographs showing a step of attaching a heating element film and a decorative film in a method of manufacturing a radiant heater assembly according to a first embodiment of the present invention. 12 is a photograph showing an example in which a radiant 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 TOM method, but is applied by applying a pressure at a temperature of about 110 ℃.

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

The heat generation behavior and electrical characteristics of the radiant heater assembly according to the first embodiment implemented as a glove box will be described with reference to FIGS. 13 and 14 as follows. 13 and 14 are thermal images of the radiant heater assembly of FIG. 12.

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

Referring to FIGS. 13 and 14, even when the first and second glove boxes are three-dimensional rather than planar, it may be confirmed that the overall heating is very uniform. And it can be seen that there is no damage to the surface heating elements of the heating film attached to the first and second glove box.

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

Measurement time (Sec) Driving voltage (V) Current (A) Output (W) First glove box 300 12 4.939 59.228 Second Glove Box 300 12 5.046 60.512

Table 2 shows the emissivity and the radiation energy according to the temperature of the first and second glove box according to the KFIA-FI-1005 measurement standard, it can be seen that the emissivity of about 0.92 at both 50 ℃, 100 ℃. Here, KFIA-FI-1005 is a method of measuring far-infrared emissivity and radiation energy by using an infrared spectrophotometer. The KFIA-FI-1005 is measured by using an FT-IR spectrometer.

As such, the radiant heater assembly according to the first embodiment is not intended to provide a feeling of warmth by contact but rather to provide a feeling of warmth to the driver or passengers by radiation, so the emissivity is a very important factor.

[Comparison of exothermic characteristics and heat-receiving part thermal effects of Example 1 and Comparative Example]

Comparing the heat generation characteristics and the heat-heating unit heat effect of the radiant heater assembly according to the comparative example and the first embodiment implemented as a glove box is shown in Table 3 below. Here, the radiant heater assembly according to the comparative example used a carbon weaving heater as a heating element.

Input voltage Input power surface
70 ℃ reach time Time to reach 20 ℃ on surface of heat receiving part 10cm away First embodiment DC 12V 60 W Within 2 minutes Within 4 minutes Comparative example DC 12V 60 W More than 4 minutes Within 8 minutes

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

After 4 hours of cold shock, the cold chamber was turned off, and the heat receiving unit equipped with the temperature sensor was installed at a distance of 10 cm to the same height as that of the radiant heater assembly. DC 12V was applied to the heating element film and the carbon woven heater of the radiant heater assembly according to the first embodiment and the comparative example, respectively, to observe the surface temperature of the radiant heater assembly and the temperature change of the heat receiving portion at a distance of 10 cm. Described.

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

On the other hand, since the carbon weaving heater of the radiant heater assembly according to the comparative example requires a manufacturing process such as knitting and plating, the production cost is high and the carbon weaving heater is composed of the fiber, so the high heat capacity causes the risk of low temperature burns. It is high and has the disadvantage of being difficult to attach to the car interior.

[Comparison of heat generation characteristics and heat-heating part heat effect according to installation of mesh type assembly and reflector]

In the radiant heater assembly according to the first embodiment, the heat generating characteristics and the heat-receiving portion thermal effects when the mesh type assembly and the reflecting plate are installed on the lower surface of the first frame and when not installed are shown in Table 4 below. . The radiant heater assembly in which the mesh type assembly and the reflecting plate are provided on the lower surface of the first frame is referred to as the radiant heater assembly according to the embodiment 1-1. The radiant heater assembly in which the mesh type assembly and the reflecting plate is not provided on the lower surface of the first frame is referred to as the radiant heater assembly according to the embodiment 1-2. As the mesh type assembly, one having an opening ratio of 50% was used.

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

Referring to Table 4, the time when the temperature of the surface of the radiant heater assembly according to the embodiment 1-1 reaches 70 ° C. and the time when the surface of the heat receiving portion at a distance of 10 cm reaches 20 ° C. is within 1 minute 30 seconds and 3 Measured within minutes.

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

Therefore, it can be seen that the heat generating characteristics and the heat-receiving portion thermal effects of the radiant heater assembly according to the first-first embodiment are superior to the first-second embodiment. This is judged to be an effect caused by providing the mesh type assembly and the reflecting plate on the lower surface of the first frame.

[Comparison of Heat Generation Characteristics and Heat-Resistant Heat Effects of Opening Ratio of Mesh-Type Assembly Plates]

In the radiant heater assembly according to the first embodiment, the heat generation characteristics according to the opening ratio of the mesh-shaped assembly plate and the heat-receiving portion thermal effect is as shown in Table 5 below.

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

Referring to Table 5, when the opening ratio is 30% or less, it can be seen that it does not greatly help to improve the efficiency of the radiant heater assembly. When the aperture ratio is 40% or more, it can be seen that the quickness of the radiant heater assembly is improved. Up to 50% to 70% of the aperture ratio was confirmed that almost the same effect can be obtained.

This is believed to be because when the mesh-like assembly and the reflecting plate are at the bottom of the first frame, the radiation efficiency in one direction of the radiant heat increases and is more advantageous for heating the surface of the radiant heater assembly due to the lower heat capacity. In addition, it was confirmed that the risk of low-temperature burns disappeared almost.

Second Embodiment

Meanwhile, an example in which the radiant heater assembly according to the first embodiment is implemented as a glove box is not limited thereto. For example, the radiant heater assembly may be applied to steering wheel columns, consoles, seats, and the like for automobiles. 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 exothermic temperature with time during the DC 12V driving of the radiant heater assembly of FIG. 15. FIG. 15 is a thermal image of the radiant heater assembly according to the second embodiment when the DC 12V is driven. FIG. 16 is a view illustrating a change in exothermic temperature according to measurement time for each spot of a radiant heater assembly according to a second embodiment.

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

On the other hand, the embodiments disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out 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 wiring 48: second electrode terminal
49: second cable 51: planar heating element
53: cover layer 60: decorative film
70: mesh type assembly plate 80: reflecting plate
91, 93, 95, 97: adhesive layer 100: radiant heater assembly

Claims (12)

A first frame having a lower surface and an upper surface opposite the lower surface;
A heating element film attached to an upper surface of the first frame and having a plurality of planar heating elements that emit heat by receiving power; And
A reflection plate disposed under the lower surface of the first frame to form an air layer between the heating element films, and reflecting radiant heat emitted from the heating element film toward the first frame;
Radiation heater assembly comprising a. The method of claim 1,
A mesh type assembly plate interposed between the first frame and the reflection plate to form an air layer;
Radiant heater assembly further comprising. The method of claim 2,
Radiation heater assembly, characterized in that the opening ratio of the mesh-shaped assembly plate is 40% or more. The method of claim 2,
The mesh-shaped assembly plate is a radiant heater assembly, characterized in that the neighboring side is opened with respect to the surface facing the first frame and the reflecting plate. The method of claim 2,
The first frame and the mesh-shaped assembly plate is a plastic material,
The mesh type assembly plate is radiant heater assembly, characterized in that formed integrally with the first frame on the lower surface of the first frame. The method of claim 1, wherein the heating element film,
A base substrate having a lower surface attached to an upper surface of the first frame;
An electrode wiring pattern of a metal material formed on an upper surface of the base substrate;
A 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 being supplied with power to the electrode wiring pattern; And
A cover layer sealing an upper surface of the base substrate on which the plurality of planar heating elements are formed and dissipating heat generated from the plurality of planar heating elements;
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. The heating element composition according to claim 6, wherein the heating element composition forming the plurality of planar heating elements is
Mixed binders comprising hexamethylene diisocyanate, polyvinyl acetal and phenolic resins or comprising epoxy acrylate, polyvinyl acetal and phenolic resins; And
The conductive particles further comprising silver powder, silver coated nickel powder or silver coated copper powder;
Radiant heater assembly comprising a. The method of claim 1,
A decorative film attached to an upper surface of the heating element film;
Radiant heater assembly further comprising. The method of claim 1,
A second frame attached to a lower surface of the reflector;
Radiant heater assembly further comprising. The method of claim 9,
And 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 having a lower surface and an upper surface opposite the lower surface;
A heating element film attached to an upper surface of the first frame and having a plurality of planar heating elements that emit heat by receiving power;
A mesh type assembly plate laminated on a lower surface of the first frame and having a porosity; And
A reflection plate laminated on the mesh-shaped assembly plate facing the lower surface of the first frame and reflecting radiant heat emitted from the heating element film toward the first frame;
Radiation heater assembly comprising a. A first frame having a lower surface and an upper surface opposite the lower surface;
It is attached to the upper surface of the first frame, and comprises a plurality of planar heating element to emit radiant heat by generating heat by applying power, the plurality of planar heating element is a heating element composition containing carbon nanotube particles and graphite particles as conductive particles Heating element film formed by printing;
A decorative film attached to an upper surface of the heating element film;
A mesh type assembly plate laminated on a lower surface of the first frame and having a porosity;
A reflection plate laminated on the mesh-shaped assembly plate facing 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 a lower surface of the reflector;
Radiation heater assembly comprising a.

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