KR20060068609A - Planar heating apparatus and method of making the same - Google Patents

Abstract

The present invention relates to a planar heating device and a method of manufacturing the same. The planar heating device according to the present invention has a conductive heating portion that generates heat by receiving a predetermined power supply through an electrode portion, and a non-conductive coating portion covering the conductive heating portion, wherein the conductive heating portion includes a fabric layer formed of a heat resistant fiber material; And a heat generating layer formed by mixing the heat-generating composite material through a water-soluble conductive phenol resin binder and coating it on at least one side of the fabric layer with a predetermined uniform thickness. Accordingly, it is possible to provide a planar heating device having high heat resistance and flexibility by providing a coating part having improved adhesion to the heat generating part and a manufacturing method thereof.

Description

Planar heating apparatus and method of manufacturing the same {Planar heating apparatus and method of making the same}

1 is a schematic configuration diagram of a planar heating device according to an embodiment of the present invention,

2 is a cross-sectional view taken along line A-A of FIG. 1 according to an embodiment of the present invention;

3 is a cross-sectional view taken along line B-B of FIG. 1 according to an embodiment of the present invention;

4 is a cross-sectional view taken along the line B-B of Figure 1 according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Planar heating device 10: Conductive heating part

11: fabric layer 12: fiber yarn

13, 15: heating layer 20: electrode portion

22: metal yarn 30: non-conductive coating

40: electrode terminal 41: terminal fixing portion

The present invention relates to a planar heating device and a method of manufacturing the same, and more particularly, to a planar heating device and a method for manufacturing the planar heating device which is heated by a power supply through the electrode portion and is coated with a heat resistant material.

The planar heating device forms a conductive coating layer using a predetermined adhesive on a planar material such as a cloth or a film using a predetermined adhesive to provide a heating part, and a predetermined electrode capable of supplying power to the heating part. It is formed by providing a wealth. In addition, the surface of the heat generating portion is formed of a urethane material or the like for the insulation and waterproofing of the heat generating portion.

However, it is not easy to ensure the overall thickness of the conductive coating layer uniformly in the surface heating device, and it is common that the adhesive strength between the conductive coating layer and the surface material is locally different. Accordingly, it is difficult to keep constant the overall electrical resistance value of the heat generating portion acting as a heat generating resistor of the planar heating device.

In addition, when bent or folded for use in planar heating devices, cracking may be caused. In addition, due to the non-uniform electrical resistance value may cause a change in the physical properties of the heat generating portion to generate high heat locally.

In addition, a silver paste or a copper tape attached with a conductive adhesive is used as an electrode unit for supplying power to the heat generating unit, and copper wire may be arranged on the surface of the heat generating unit to be woven. In the case of using such a conventional electrode unit, it is difficult to sufficiently secure the flexibility of the planar heating device and thus has limitations in use. In addition, bending or folding the surface heating device may cause disconnection and sparking of the electrode.

In addition, when the coating part is formed by laminating the surface of the heating part with an insulating material, air may be introduced to form an air bag, which may cause the coating layer to loosen due to expansion of the air bag during heating.

Accordingly, an object of the present invention is to provide a planar heating device having a high heat resistance and flexibility by providing a coating part with improved adhesion to the heat generating part, and a manufacturing method thereof. In addition, by providing a heat generating portion coated with a uniform thickness, and an electrode portion that can effectively prevent disconnection to provide a planar heating device and flexibility and improved thermal efficiency and a method of manufacturing the same.

The above object is, according to the present invention, in the planar heating device having a conductive heating portion that generates heat by receiving a predetermined power supply through an electrode portion, and a non-conductive coating portion covering the conductive heating portion, the conductive heating portion, heat-resistant fiber In the planar heating device comprising a fabric layer formed of a material and a heat generating layer formed by mixing a heat-generating composite material through a water-soluble conductive phenol resin binder by coating a predetermined uniform thickness on at least one side of the fabric layer. Is achieved.

Here, the heat generating layer is a conductive semiconductor fine particles containing carbon fiber and graphite, tourmaline-containing far-infrared radiation ceramic fine particles, high thermal conductivity boron nitride-based composite polymer fine particles through a water-soluble conductive phenol resin binder By mixing to form a predetermined uniform thickness on at least one side of the fabric layer can be formed.

The non-conductive coating part may be formed by uniformly coating the conductive heating part with a high heat-resistant polyether sulfone resin to a predetermined thickness.

Here, the electrode portion may be formed by sewn a copper wire stranded copper wire to the conductive heating portion.

Here, the electrode unit may be formed by weaving a plurality of strands of co-bonded twisted wire strands at intervals of 0.2 to 0.5 mm when weaving the fabric layer.

On the other hand, according to another field of the present invention, in the manufacturing method of the planar heating device having a conductive heating unit which generates heat by receiving a predetermined power supply through an electrode unit, and a non-conductive coating unit covering the conductive heating unit, The heat generating composite material is mixed through a water-soluble conductive binder to coat a heat generating layer on at least one side of the fabric layer formed of a heat resistant fiber material, thereby forming a conductive heat generating part, and having a predetermined thickness on the outside of the coated heat generating layer. It is achieved by a method for producing a planar heating device which coats a polyether sulfone resin to form a non-conductive coating.

Here, the process of forming the conductive heating portion, the residue is removed by scraping so that the thickness of the coated heating layer is uniform, and after drying the coating of the heating layer is dried at a low temperature at a predetermined first temperature condition, after drying the predetermined The method may further include aging the coating so that the coating is stabilized for a predetermined time at the second temperature condition.

Here, after the drying of the heat generating layer may be further comprising forming the electrode portion by stitching the twisted copper twisted wire in the conductive heating portion.

Here, when weaving the fabric layer can be configured to weave a plurality of strands of twisted twisted copper wire so that the pitch between the strands 0.2 to 0.5mm interval to form the electrode portion.

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

1 is a schematic configuration diagram of a planar heating device according to an embodiment of the present invention. As shown, the planar heating device 1 according to an embodiment of the present invention, the conductive heating unit 10 and the conductive heating unit 10 that generates power by being supplied with power through the electrode unit 20, Non-conductive covering 30.

The electrode unit 20 receives power from the outside through the electrode terminal 40. An AC power source or a DC power source may be supplied to the electrode terminal 40, and accordingly, the shape of the electrode unit 20 may be appropriately modified. In addition, in the present embodiment, the two electrode portions 20 are arranged in parallel with a predetermined distance from the edge of the conductive heating portion 10, but the electrode portion in accordance with the various shapes of the planar heating device (1) The shapes of 20 may be arranged differently.

Detailed structure of the planar heating device 1 according to an embodiment of the present invention will be described with reference to the cross-sectional view of FIG. FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 for convenience of description.

As shown in the drawing, the conductive heating unit 10 includes a fabric layer 11 formed of a heat resistant fiber material and a heating layer formed by coating a heating material with a conductive binder on at least one side of the fabric layer 11 with a uniform thickness. (13, 15), and the electrode portion 20 formed through the fabric layer 11 and the heat generating layer (13, 15) sewn.

Outside the conductive heat generating portion 10 is provided with a non-conductive coating portion 30 coated with a high heat-resistant polyether sulfone (PES) resin having similar properties as a conductive binder as an insulating member.

Here, the fabric layer 11 is formed of a natural fiber or a chemical fiber material having heat resistance in a planar shape, for example, may be formed of rayon, denim, polyester, or the like. In case of rayon, a large amount of far-infrared energy is emitted when heat is applied, and polyester has a dense and uniform twisted yarn structure, so it is excellent in heat resistance, and in the case of denim, it has excellent tensile strength and banding strength, so it generates surface heat. Adopt and use according to the purpose of the device.

The heat generating layers 13 and 15 mix conductive semiconductor fine particles, far-infrared radiation ceramic fine particles, and thermally conductive fine particles through a conductive resin binder to a predetermined uniform thickness on at least one side of the fabric layer 11. Formed by coating.

At this time, as the conductive semiconductor fine particles, carbon and graphite are prepared and prepared in a powder state. The particle diameter of each powder of carbon and graphite is 1 micron or less, and the particle | grains of 0.1 micron or less are sorted and removed. In addition, the mixing ratio of carbon and graphite is about 1: 2 to 1: 3 ratio.

And as a far-infrared radiation ceramic granule, it is prepared that the powder particle diameter of the tourmaline which is excellent in far-infrared radiation efficiency is 0.5 micron or less. At this time, the ceramic fine particles of other components other than tourmaline may be further included. In this case, the far-infrared radiation ceramic granules are sized to serve as intermediates of the semiconductor particulates. In addition, according to the amount of far-infrared radiation ceramic fine particles used, the negative ion generating effect can be additionally exhibited.

The thermally conductive fine particles are prepared such that the powder particle diameter of boron nitrite, which is excellent in mechanical strength and has high thermal conductivity even at a thin thickness, is 1 micron or less.

As the conductive resin binder, an aqueous solution type conductive phenol resin having water solubility is adopted. By adopting a binder having water solubility in the planar heating device according to an embodiment of the present invention, the permeability into the fabric layer is better than that of the useful binder, thereby improving the connection between the heating materials coated on both sides of the fabric layer. At this time, the conductivity of the conductive binder may be maintained at about 50% or less, for example, 30% or less, thereby preventing local conduction voids, thereby maintaining heat generation on both sides of the conductive heating part 10 of the planar heating device 1 evenly. In addition, the water-soluble conductive phenolic resin binder anionic resin is excellent in binding property and dispersibility with other cationized additives constituting the heat generating material. In addition, an appropriate amount of a resistance stabilizer and a leveling agent for improving the spreadability may be mixed with the conductive resin binder.

Meanwhile, in FIG. 2, the electrode unit 20 is formed by stitching the heating layers 10 and 15 through the heating unit 10 after completing the coating of the heating layers 13 and 15 on the fabric layer 11 using metal yarns made of twisted copper twisted pair. will be. At this time, the metal yarn is a braided copper twisted wire which is twisted by joining 7 copper copper wires having a diameter of about 80 microns (0.08 mm), and the diameter of the braided copper twisted wire is about 0.24 mm. In FIG. 2, although the electrode portion 20 is sewn by sewn two strands of the braided copper stranded wire at predetermined intervals, it can be formed from 7 to 12 strands, and the number of strands of the metal yarn can be appropriately selected. . In addition, the space | interval between the strands of the metal yarn which forms the electrode part 20 may be ensured about the diameter of a metal yarn.

In FIG. 3, an example in which the electrode terminal 40 is installed in the electrode part 20 is illustrated in a cross-sectional view taken along line BB of FIG. 1, and the metal terminal fixing part 41 is fixed to the electrode terminal 40 by riveting. An example is shown. Here, the metal yarn of the co-ply twisted copper wire forming the electrode portion 20 is sewn onto the heat generating portion 10 to exemplarily show a shape protruding to the surface, and the stitch stitch interval of the sewn metal yarn is about 2 mm densely and according to the use. Adopted in proper dimensions. At this time, the appropriate tension is applied to the metal yarn of the plywood twisted line when sewn so as to prevent crushing of the electrode unit 20.

In the planar heating device according to another embodiment of the present invention, the metal yarns may be formed by weaving the fiber yarns at the time of weaving the fabric layer 11, without stitching the electrode portions 20 through the heat generating portions 10. . FIG. 4 is a cross-sectional view taken along line B-B in FIG. 1 to show an example in which the metal yarn 22 of the braided twisted-pair wire is woven with the fiber yarn 12 to form the fabric layer 11. In the present embodiment, the size and the number of strands of the metal yarn 22 may use the same size and the number of strands as the above-described plywood copper wire. At this time, the pitch between the strands of the metal yarn 22 may be 0.2mm to 0.5mm and weave. As such, when the electrode unit 20 is formed at the same time as the weaving of the fabric layer 11, the process of stitching the electrode unit 20 into the heat generating unit 10 is unnecessary, and thus, the heat generating layers 13 and 15 may be formed as described above. After coating the fabric layer 11 to a predetermined uniform thickness, the non-conductive coating portion 30 is coated.

Hereinafter, a process of coating the heating layers 13 and 15 on the fabric layer 11 to form the heating unit 10 and coating the non-conductive coating unit 30 on the heating unit 10 will be described in more detail.

In order to uniformly disperse the heating material and the binder prepared as described above, the mixture is mixed using a high speed mixer, and the amount of solvent and water is adjusted in consideration of temperature, working time, storage time, and working conditions so as to have an appropriate viscosity. In addition, a vacuum mixer is used for preventing the inflow of air and for quick evacuation.

The heat generating layer is coated using a predetermined coating apparatus having a plurality of guide rollers and both side clip-type tensioning apparatuses using the mixed materials. Accordingly, while maintaining the tension of the four sides in a constant state to coat the heating layer at a speed of approximately 15m or less per minute, to form a uniform heating layer according to the coating amount and coating thickness preset according to the use. Here, the scraping process may be performed to form a uniform coating thickness of the heating layers 13 and 15, and for this purpose, a separate scraper or scrap roller may be used. This is to prevent heat concentration that may occur due to local thickness variation in the heating layers 13 and 15.

When the exothermic layers 13 and 15 are coated, they are dried at a relatively low temperature condition (about 150 degrees or less) in a drying furnace at low speed. Drying at high temperatures at high speeds can cause the heating layer to crush in the final product. In the case of long-term storage of the heat generating unit 10, which is dried and provided as an intermediate product, it is preferable to keep it waterproof and sealed to prevent changes in product characteristics.

After the drying process, stable molecular arrangement of the heating material is ensured, and it is aged through appropriate heat and compression for uniformity of temperature distribution, prevention of temperature deviation, and improvement of quality of the final product. .

First, the first heating for stabilization of the coated heating layer (13, 15) for about a predetermined time (about 1 hour or less, about 40 minutes or less) at about 180 degrees Celsius or less, and about 24 hours at about 110 degrees Celsius or less 2 Mature the tea.

As described above, when the heating layers 13 and 15 are coated on the fabric layer 11, and the heating unit 10 is provided through a drying and aging process, the polyether sulfone resin is applied to the outside of the heating layers 13 and 15 at an appropriate temperature. It is melted by heating to form a non-conductive coating 30 by vacuum coating. At this time, the coating part 30 is formed to have a thickness of approximately 1.5mm to 2mm if it has a uniform thickness. The polyether sulfone resin has thermal stability under conditions of about 140 degrees Celsius or more, and thus it is possible to provide a planar heating device excellent in thermal deformation. In addition, the polyether sulfone resin has excellent mechanical and physical properties in terms of flexibility, firmness, shear, strength, and tensile strength in addition to heat resistance, having excellent rigidity and elasticity.

Planar heating device according to the present invention can be used for medical or general household, agriculture, animal husbandry, building use, and can be used in vinyl houses, automobiles, aircraft and the like. And it can emit far infrared rays of 4 ~ 10 micron wavelength and negative (-) ion of 2000cc / ㎠ or more at the time of heating. In addition, it has a structure that prevents damage to the internal heating part in various installation environments, and has a structure that can be used in a low temperature (40 degrees Celsius or less) environment and a high temperature environment (150 degrees Celsius or less).

Accordingly, the planar heating device according to an embodiment of the present invention can manufacture a medium-size, small products using a DC power source, and can produce a large, medium-size product when using an AC power source. In addition, a product formed by weaving the electrode unit 20 on the fabric layer 11 may be used for a DC power supply, and a product formed by stitching the electrode unit 20 to the heat generating unit 10 may be used for an AC power source, but is not limited thereto. No.

Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

According to the present invention, the planar heating device has a high heat resistance and flexibility by providing a coating part with improved adhesion to the heat generating part. In addition, by providing a heating portion coated with a uniform thickness, and an electrode portion that can effectively prevent disconnection can improve the thermal efficiency with flexibility.

Claims (9)

In the planar heating device having a conductive heating portion that generates heat by receiving a predetermined power supply through an electrode portion, and a non-conductive coating portion covering the conductive heating portion, The conductive heating unit is a heat generating layer formed by coating a fabric layer formed of a heat resistant fiber material and a heat generating composite material by mixing a water-soluble conductive phenol resin binder to at least one side of the fabric layer with a predetermined uniform thickness. Planar heating device comprising a. The method of claim 1, The heat generating layer is a conductive semiconductor fine particles containing carbon fiber and graphite, tourmaline-containing far-infrared radiation ceramic fine particles, and high thermal conductivity boron nitride-based composite polymer fine particles are mixed through a water-soluble conductive phenol resin binder. Planar heating device is formed by coating a predetermined uniform thickness on at least one side of the fabric layer. The method of claim 1, And the non-conductive coating part is formed by uniformly coating the conductive heating part with a high heat-resistant polyether sulfone resin to a predetermined thickness. The method of claim 1, The electrode unit is a planar heating device which is formed by stitching a twisted joint copper wire to the conductive heating unit. The method of claim 1, The electrode unit is a planar heating device is formed by weaving a plurality of strands of coarse twisted wire strand when weaving the fabric layer so that the pitch between the strands 0.2 to 0.5mm interval. In the manufacturing method of the planar heating device which has a conductive heating part which generate | occur | produces heat by receiving predetermined | prescribed power supply through an electrode part, and a non-conductive coating part which coat | covers the said conductive heating part, Forming a conductive heating part by coating the heating layer on at least one side of the fabric layer formed of heat-resistant fiber material by mixing the heating composite material through a water-soluble conductive binder, Method of manufacturing a planar heating device to form a non-conductive coating portion by coating a non-conductive polyether sulfone resin with a predetermined thickness on the outside of the coated heating layer. The method of claim 6, The forming of the conductive heating unit may include scraping the coated heating layer to have a uniform thickness, drying at a low temperature at a predetermined first temperature after completion of coating of the heating layer, and drying for a predetermined time at a predetermined second temperature. Method for producing a surface heating device further comprising the step of aging so that the coating is stabilized. The method of claim 7, wherein And drying the braided copper wire in the conductive heating unit after drying the heating layer to form the electrode unit. The method of claim 6, The method of manufacturing a planar heating device further comprising forming the electrode part by weaving a plurality of strands of coarse stranded copper strands at intervals of 0.2 to 0.5 mm when weaving the fabric layer.

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