WO2007052858A1

WO2007052858A1 - Method and apparatus for manufacturing electric heating sheet and product thereof

Info

Publication number: WO2007052858A1
Application number: PCT/KR2005/004054
Authority: WO
Inventors: Sang-Hee Kwan; Young-Han Oh
Original assignee: Sang-Hee Kwan; Young-Han Oh
Priority date: 2005-11-03
Filing date: 2005-11-30
Publication date: 2007-05-10

Abstract

The present invention relates to a method and apparatus for manufacturing an electric heating sheet and a product thereof, and more particularly, to a method and apparatus for manufacturing an electric heating sheet and a product thereof, in which a carbon line is used as an elec trothermal wire, and reduction of electromagnetic wave, electrical safety, and durability are improved while a mass production is performed. For this, the present invention provides the method for manufacturing the electric heating sheet, including a sheet supplying step, a carbon line supplying step, a heating and carrying step, a primary electrical conductive tape adhering step, a secondary electrical conductive tape adhering step, a intermediate member adhering step, a pressing step, and a cutting step, and the manufacture apparatus and the product thereof. Ac cordingly, the present invention has a very useful effect in that a carbon line is firmly fixed while the electric heating sheet can be mass produced sequentially.

Description

METHOD AND APPARATUS FOR MANUFACTURING ELECTRIC HEATING SHEET AND PRODUCT THEREOF

Technical Field

[1] The present invention relates to a method and apparatus for manufacturing an electric heating sheet and a product thereof, and more particularly, to a method and apparatus for manufacturing an electric heating sheet and a product thereof, in which a carbon line is used as an electrothermal wire, and reduction of electromagnetic wave, electrical safety, and durability are improved while a mass production is performed. Background Art

[2] In general, an electric heating sheet emits heat owing to its internal hot wire when a power source is applied. Such the electric heating sheet is cheap in a service charge for electricity in comparison with a boiler using oil, gas, and electricity as an energy source, and is very simple and convenient in its execution on its characteristic of shape, and has not even anxiety about winter-sowing and, in addition, makes it possible to perform partial heating as well, thereby greatly increasing in demand.

[3] In early days, such the electric heating sheet employs a nichrome wire or an iron- nichrome wire but, in recent years, gradually extends to employ a carbon line having a very high electrical efficiency and less generating electromagnetic wave.

[4] Particularly, a quasi-one-dimensional fiber semiconductor (Korean Patent No.

0412340) being a carbon line invented by an inventor of this application, and an electric heating sheet using the same (Korean Patent No. 0347661) make it possible to have more pratical use and competitiveness owing to their minimal power consumptions and high efficiencies of heat emission.

[5] FIGS. 1 and 2 are perspective view and exploded perspective view illustrating a structure of an electric heating sheet earlier filed by the inventor of this application and granted for patent. As shown, in the electric heating sheet (S), carbon lines 20 are arranged to be at a predetermined interval on opposite surfaces of upper and lower electric heating sheet papers 51 and 52, and a heating foil 10 is provided to have a belt shape on the carbon line 20. The carbon lines 20 are adhered and fixed at their ends to the surfaces of the upper and lower electric heating sheet papers 51 and 52, using first and second electrodes 30 and 35 being conductive tapes. Electrical insulating foils 60 are adhered to the first and second electrodes 30 and 35. In the upper and lower electric heating sheet papers 51 and 52, the top and bottom carbon lines 20 are disposed to be at an interval of about 10 cm to 15 cm, and are combined with each other.

[6] Accordingly, the conventional electric heating sheet (S) is advantageous of rapidly emitting the heat in total since the carbon lines 20 are electrically conducted through the first and second electrodes 30 and 35, thereby emitting heat, and the heating foil 10 covering the carbon line 20 emits heat as well.

[7] However, the conventional electric heating sheet (S) has a drawback in that mass production of the electric heating sheet (S) is impossible since a plurality of the tape type heating foils 10 are adhered one by one through a manual work in order to fix the carbon lines 20 to the upper and lower electric heating sheet papers 51 and 52. Further, the conventional electric heating sheet (S) has a drawback of not capable of minimizing generation of the electromagnetic wave and not capable of being mass produced since the interval between the carbon lines 20 is not constantly maintained while the heating foil 10 is adhered.

[8] As shown in FIG. 2, in the conventional electric heating sheet, in order to prevent contact between the first and second electrodes 30 and 35, it is essential that the electrical insulating foils 60 having greater widths are adhered on the first and second electrodes 30 and 35 by the manual work. Accordingly, when the electric heating sheet (S) is under thermal combination, the electrical insulating foils 60 are hardened at their contact portions, thereby having no choice but to lose a property of adhesiveness. Therefore, there occurs a serious drawback in that the carbon lines 20 positioned at the electrical insulating foils 60 are free from fixation as shown in FIG. 3, thereby being short-circuited with each other. Disclosure of Invention

Technical Problem

[9] Accordingly, the present invention is directed to a method and apparatus for manufacturing an electric heating sheet, and a product thereof that substantially obviate one or more of the problems due to limitations and disadvantages of the related art.

[10] An object of the present invention is to provide a method and apparatus for manufacturing an electric heating sheet, for firmly fixing a carbon line while sequentially mass producing the electrical heating sheet.

[11] Another object of the present invention is to provide a method and apparatus for manufacturing an electric heating sheet, and a product thereof, for preventing carbon lines from being short-circuited in the electric heating sheet.

[12] A further another object of the present invention is to provide a method and apparatus for manufacturing an electric heating sheet, and a product thereof, for minimizing generation of electromagnetic wave of the electric heating sheet. Technical Solution

[13] To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, there is provided a method for manufacturing an electric heating sheet, the method including the steps of: supplying an upper sheet and a lower sheet; receiving carbon lines in both lateral directions, and maintaining the received carbon lines to be arranged at a predetermined interval while supplying the carbon lines between the upper sheet and the lower sheet; heating while carrying the upper sheet and the lower sheet; adhering a first electrical conductive tape to the upper sheet heated and carried; adhering a second electrical conductive tape to the upper sheet, and adhering a third electrical conductive tape to the lower sheet; adhering an intermediate member for electrical insulation to the first electrical conductive tape of the upper sheet; pressing the upper sheet having the intermediate member, and the lower sheet; and cutting the press-completed electric heating sheet at a predetermined size.

[14] In another aspect of the present invention, there is provided an apparatus for manufacturing an electric heating sheet, the apparatus including: a body having an upper sheet reel and a lower sheet reel, and having a carriage table; a carbon-line guide unit installed at the body and guiding sequentially supplied carbon lines; heating carriages installed at one sides of the body, and heating an upper sheet and a lower sheet supplied from the upper and lower sheet reels, respectively; and press rollers installed at the body, and pressing the upper sheet and the lower sheet guided by and coming from the heating carriages.

[15] In a further another aspect of the present invention, there is provided an electric heating sheet including: an upper sheet and a lower sheet; first, second, and third electrical conductive tapes adhered to a bottom surface of the upper sheet and a top surface of the lower sheet; an intermediate member adhered between the first and third electrical conductive tapes; and carbon lines each provided between the first electrical conductive tape and the intermediate member, and between the third electrical conductive tape and the intermediate member.

Advantageous Effects

[16] As described above, the present invention has a very useful effect in that an electric sheet can be sequentially mass produced since an upper sheet, a lower sheet, and a carbon line are automatically supplied, heated, and pressed in a sequential manner, and a work for adhering first and second electrical conductive tapes and an intermediate member can be repeatedly performed at a predetermined position as well.

[17] Further, the present invention has a very useful effect in that since the first and second electrical conductive tapes and the intermediate member are automatically consistent with accuracy while pressed, an efficiency of work is increased, a possibility of an internal short-circuit of the electric heating sheet is remarkably reduced, and the electrical stability is improved by reinforcing conductivity. [18] Furthermore, the present invention has a very useful effect in that since the carbon lines are pressed and adhered at both surfaces by the upper sheet, the lower sheet, and the first to fifth electrical conductive tapes, the carbon line is firmly fixed, thereby remarkably preventing short-circuit between the carbon lines and therefore, improving the electrical stability of the product.

[19] In addition, the present invention has a very useful effect in that since arrangement of the carbon lines is constantly maintained without disorder in a manufacture process, generation of the electromagnetic wave is greatly reduced, thereby improving a product reliability of the electric heating sheet. Brief Description of the Drawings

[20] FIGS. 1 and 2 are perspective view and exploded perspective view illustrating a conventional electric heating sheet;

[21] FIG. 3 is a partial and plan sectional view illustrating the conventional electric heating sheet of FIG. 2;

[22] FIG. 4 is a block diagram illustrating a method for manufacturing an electric heating sheet according to the present invention;

[23] FIG. 5 is a perspective view illustrating an apparatus for manufacturing an electric heating sheet according to the present invention;

[24] FIG. 6 is a partial and magnified perspective view illustrating an apparatus for manufacturing an electric heating sheet according to the present invention;

[25] FIGS. 7 to 12 are schematic side sectional views of an apparatus for manufacturing an electric heating sheet, for illustrating a method for manufacturing the electric heating sheet according to the present invention;

[26] FIG. 13 is a magnified sectional view illustrating an electric heating sheet produced according to the present invention;

[27] FIG. 14 is a plan view illustrating an electric heating sheet produced according to the present invention;

[28] FIG. 15 is a partial and magnified sectional view of an electric heating sheet, for illustrating an intermediate member according to another embodiment of the present invention; and

[29] FIG. 16 is a partial and magnified sectional view of an electric heating sheet, for illustrating an intermediate member according to a further another embodiment of the present invention. Best Mode for Carrying Out the Invention

[30] A method and apparatus for manufacturing an electric heating sheet, and the electric heating sheet according to an embodiment of the present invention will be separately described below with reference to accompanying drawings. [31]

[32] <Method for manufacturing electric heating sheet>

[33] FIG. 4 is a block diagram illustrating a method for manufacturing an electric heating sheet according to the present invention, and FIGS. 7 to 12 are schematic side sectional view of an apparatus for manufacturing the electric heating sheet, for illustrating a method for manufacturing the electric heating sheet according to the present invention. The inventive manufacture method includes a step of supplying the electric heating sheet, a step of supplying a carbon line, a heating and carrying step, a primary step of adhering an electrical conductive tape, a secondary step of adhering an electrical conductive tape, a step of adhering an intermediate member, a pressing step, and a cutting step.

[34] As shown in FIGS. 5 and 7, in the sheet supplying step of supplying an upper sheet

610 and a lower sheet 620, the upper sheet 610 and the lower sheet 620 formed of transparent synthetic resin are sequentially supplied toward heating carriages 400, respectively.

[35] As shown in FIGS. 5, 6, and 7, in the carbon line supplying step of supplying the carbon lines (C) to the upper sheet 610 and the lower sheet 620 respectively, the carbon lines (C) are received at a side surface of a body 200 and are smoothly arranged to be at a predetermined interval.

[36] As shown in FIG. 7, in the heating and carrying step of heating while carrying the upper sheet 610 and the lower sheet 620, the upper sheet 610 and the lower sheet 620 are changed to be in a little soft state, thereby being well heated and pressed by the respective heating carriages 400, and even thermosetting adhesive coated on one surfaces of the upper sheet 610 and the lower sheet 620 has a property of adhesiveness owing to heating.

[37] As shown in FIG. 8, in the primary conductive tape adhering step of primarily adhering the first electrical conductive tape 630 to the upper sheet 610 carried along the heating carriage 400, the first electrical conductive tape 630 is long adhered in a transverse direction to the upper sheet 610 positioned on a top surface of the heating carriage 400.

[38] As shown in FIG. 9, in the secondary electrical conductive tape adhering step, after the first electrical conductive tape 630 is adhered, a second electrical conductive tape 631 is adhered to the upper sheet 610 with a little gap (G), and a third electrical conductive tape 632 is adhered to the lower sheet 620.

[39] In the intermediate member adhering step of adhering the prepared intermediate member 640 to the first electrical conductive tape 630 adhered to the upper sheet 610 as shown in FIG. 10, as shown in FIG. 13, the present invention employs the intermediate member 640 including electrical insulating tapes 642 each adhered to a top surface and a bottom surface of a double sided tape 646 and having one surface on which thermosetting adhesive is coated; fourth and fifth electrical conductive tapes 643 and 644 adhered to a top surface and a bottom surface of the electrical insulating tape 642; and the electric wires 645 adhered to a top surface of the fourth electrical conductive tape 643 and a bottom surface of the fifth electrical conductive tape 644.

[40] Meantime, in addition to the intermediate member 640 of FIG. 13, as shown in FIG.

15, the present invention can employ an intermediate member 640 including electrical insulating tapes 642 each adhered to a top surface and a bottom surface of a double sided tape 646 and having one surface on which thermosetting adhesive is coated; fourth and fifth electrical conductive tapes 643 and 644 adhered to a top surface and a bottom surface of the electrical insulating tape 642; and the electric wires 645 adhered to a top surface of the fourth electrical conductive tape 643 and a bottom surface of the fifth electrical conductive tape 644.

[41] As shown in FIG. 13, in the intermediate member 640, it is desirable that the electrical insulating tape 641 and the fourth and fifth electrical conductive tapes 643 and 644 have the same widths as the first and third electrical conductive tapes 630 and 632 but, as shown in FIG. 16, the electrical insulating tape 641 can also have a little greater width than the first and third electrical conductive tapes 630 and 632.

[42] As shown in FIG. 11, in the pressing step of pressing the upper and lower sheets

610 and 620 subjected to several steps, the upper and lower sheets 610 and 620, the first to third electrical conductive tapes 630, 631, and 632, the intermediate member 640, and the carbon line (C) are integrally pressed.

[43] In the cutting step of cutting the press-completed electric heating sheet 600 at a predetermined size, as shown in FIG. 12, the electric heating sheet 600 is cut at its gap (G) portion.

[44] As such, in the inventive manufacture method of the electric heating sheet, the upper and lower sheets 610 and 620, and the carbon line (C) are automatically supplied in a sequential manner, and the upper sheet 610 and the lower sheet 620 are heated while automatically carried. Accordingly, the upper and lower sheets 610 and 620, the first to third electrical conductive tapes 630, 631, and 632, and the intermediate member 640 are automatically consistent while pressed. Therefore, the electric heating sheet 600 can be sequentially produced, and even a defective proportion is greatly reduced.

[45] Further, in the inventive manufacture method of the electric heating sheet, the first, second, and third electrical conductive tapes 630, 631, and 632, the intermediate member 640, and the carbon line (C) are accurately consistent while adhered only with a man hour for a worker's work of repeatedly adhering the first to third electrical conductive tapes 630, 631, and 632 at predetermined positions of the heating carriage 400. Accordingly, the worker can produce the electrical heating sheet 600 with more easiness and convenience, thereby improving a yield of the electrical heating sheet 600.

[46] Furthermore, in the inventive manufacture method of the electric heating sheet, a plurality of the carbon lines (C) are accurately and sequentially supplied at a predetermined interval through guide rings 350 of a side plate 300 and a cross bar 310. Accordingly, as shown in FIG. 14, the electric heating sheet 600 of a high quality where the carbon lines (C) are constantly arranged can be produced, and the carbon lines (C) arranged at a predetermined interval mutually offset electromagnetic waves, thereby greatly reducing the total electromagnetic wave of the electric heating sheet 600.

[47]

[48] <Apparatus for manufacturing electric heating sheet>

[49] FIG. 5 is the perspective view illustrating the apparatus for manufacturing the electric heating sheet according to the present invention, FIG. 6 is a partial and magnified perspective view illustrating the apparatus for manufacturing the electric heating sheet according to the present invention, and FIGS. 7 to 12 are the schematic side sectional views of the manufacture apparatus, for illustrating the method for manufacturing the electric heating sheet according to the present invention. As shown, the inventive manufacture apparatus mainly includes the body 200, a carbon-line guide unit, the heating carriage 400, and a press roller 500.

[50] The carbon-line guide unit, the heating carriage 400, and the press roller 500 are installed at the body 200. Reel type upper sheet reel 210 and lower sheet reel 220 are interchangeably installed at front upper and lower parts of the body 200. A carriage table 230 is installed at a front central and inner part of the body 200 to carry the pressed electric heating sheet 600. A power source, a driver, and a controller are installed at the body 200 to heat the heating carriage 400 and drive the press roller 500. It is desirable that a cutter (not shown) is additionally installed at the carriage table 230.

[51] The carbon-line guide unit guides the carbon lines between the upper sheet 610 and the lower sheet 620 at a predetermined interval. In an exemplary embodiment of the carbon-line guide unit, the side plates 300 having the plurality of guide rings 350 are installed at front upper and lower parts of the body 200, respectively, and the cross bars 310 each having the plurality of guide rings 350 are installed to be mutually adjacent in a transverse direction at front sides of the heating carriages 400, respectively. Accordingly, the carbon line (C) is stably supplied toward the press roller 500 through the guide ring 350 of the side plate 300 and the guide ring 350 of the cross bar 310. [52] The heating carriages 400 heat the upper sheet 610 and the lower sheet 610 supplied through the upper sheet reel 210 and the lower sheet reel 220 of the body 200, and are installed at a front central part of the body 200. The heating carriage 400 heats using a heater such as a hot wire (not shown). The heater is connected with the power source and the controller of the body 200, and emits heat and is controlled.

[53] The press rollers 500 press the upper sheet 610 and the lower sheet 620 having the built-in carbon line (C) and, is installed at the body 200 to be positioned at a direct rear side between both of the heating carriages 400.

[54] Hereinafter, the inventive apparatus 100 for manufacturing the electric heating sheet will described below in its operation divided into the sheet supplying step, the carbon line supplying step, the heating and carrying step, the primary electrical conductive tape adhering step, the secondary electrical conductive tape adhering step, the intermediate member adhering step, the pressing step, and the cutting step.

[55] First, as shown in FIGS. 5 and 7, in the sheet supplying step of supplying the upper sheet 610 and the lower sheet 620, the upper sheet 610 and the lower sheet 620 formed of the transparent synthetic resin are sequentially supplied toward the heating carriages 400 respectively, through the upper sheet reel 210 and the lower sheet reel 220 that are previsouly installed at the front upper and lower sides of the body 200 of the apparatus 100 for manufacturing the electric heating sheet.

[56] As shown in FIGS. 5, 6, and 7, in the carbon line supplying step of supplying the carbon lines (C) to the upper sheet 610 and the lower sheet 620 respectively, the carbon lines (C) are received at the side surface of the body 200 through the plurality of guide rings 350 of the side plate 300 and the plurality of guide rings 350 of the cross bar 310, and are smoothly arranged to be at a predetermined interval.

[57] As shown in FIG. 7, in the heating and carrying step of heating while carrying the upper sheet 610 and the lower sheet 620, the upper sheet 610 and the lower sheet 620 are carried along the surfaces of the respective heating carriages 400 while thermally conducted and heated by the heating carriages 400. Accordingly, the upper sheet 610 and the lower sheet 620 are changed to be in the little soft state, thereby being well heated and pressed by the respective heating carriages 400 on the characteristic of the synthetic resin, and the thermosetting adhesive coated on one surfaces of the upper sheet 610 and the lower sheet 620 has the property of adhesiveness owing to heating as well.

[58] As shown in FIG. 8, in the primary conductive tape adhering step of primarily adhering the first electrical conductive tape 630 to the upper sheet 610 carried along the heating carriage 400, the first electrical conductive tape 630 is long adhered in the transverse direction to the upper sheet 610 positioned at the top surface of the heating carriage 400. The primary electrical conductive tape 630 primarily adhered serves as an electrode plate for supplying a positive (or negative) current.

[59] As shown in FIG. 9, in the secondary electrical conductive tape adhering step, after the first electrical conductive tape 630 is adhered, the second electrical conductive tape

631 is adhered to the upper sheet 610 with a little gap (G), and the third electrical conductive tape 632 is adhered to the lower sheet 620.

[60] The second electrical conductive tape 631 serves to electrically connect all carbon lines (C) built-in between the upper sheet 610 and the lower sheet 620, and the third electrical conductive tape 632 serves as the electrode plate for supplying the negative (or positive) current. The gap (G) between the first and second electrical conductive tapes 630 and 631 corresponds to a margin portion for cutting the completed electric heating sheet 600.

[61] In the intermediate member adhering step of adhering the prepared intermediate member 640 to the first electrical conductive tape 630 adhered to the upper sheet 610 as shown in FIG. 10, as shown in FIG. 13, the intermediate member 640 includes the electrical insulating tape 641 having both surfaces on which the thermosetting adhesive is coated; the fourth and fifth electrical conductive tapes 643 and 644 adhered to the both surfaces of the electrical insulating tape 641; and the electric wires 645 adhered to the top surface of the fourth electrical conductive tape 643 and the bottom surface of the fifth electrical conductive tape 644.

[62] Meantime, in addition to the intermediate member 640 of FIG. 13, as shown in FIG.

15, the present invention can also employ the intermediate member 640 including the electrical insulating tapes 642 each adhered to the top surface and the bottom surface of the double sided tape 646 and each having one surface on which the thermosetting adhesive is coated; the fourth and fifth electrical conductive tapes 643 and 644 each adhered to the top surface and the bottom surface of the electrical insulating tape 642; and the electric wires 645 adhered to the top surface of the fourth electrical conductive tape 643 and the bottom surface of the fifth electrical conductive tape 644.

[63] As shown in FIG. 13, in the intermediate member 640, it is desirable that the electrical insulating tape 641 and the fourth and fifth electrical conductive tapes 643 and 644 have the same widths as the first and third electrical conductive tapes 630 and

632 but, as shown in FIG. 16, the electrical insulating tape 641 can also have a little greater width than the first and third electrical conductive tapes 630 and 632.

[64] As shown in FIG. 11, in the pressing step of pressing the upper sheet 610 and the lower sheet 620 subjected to the several steps, the upper and lower sheets 610 and 620, the first to third electrical conductive tapes 630, 631, and 632, the intermediate member 640, and the carbon line (C) are integrally pressed.

[65] In the cutting step of cutting the press-completed electric heating sheet 600 at a predetermined size using a cutter or scissors not shown, the electric heating sheet 600 is cut at its gap (G) portion as shown in FIG. 12.

[66] As such, in the inventive apparatus for manufacturing the electric heating sheet, the upper and lower sheet 610 and 620, and the carbon line (C) are automatically supplied in a sequential manner, and the upper sheet 610 and the lower sheet 620 are heated while automatically carried. Accordingly, the upper and lower sheets 610 and 620, the first to third electrical conductive tapes 630, 631, and 632, and the intermediate member 640 are automatically consistent while pressed. Therefore, the electric heating sheet 600 can be sequentially produced, and even a defective proportion is greatly reduced.

[67] Further, in the present invention, the first to third electrical conductive tapes 630,

631, and 632, the intermediate member 640, and the carbon line (C) are accurately consistent while adhered only with the man hour for the worker's work of repeatedly adhering the first to third electrical conductive tapes 630, 631, and 632 at predetermined positions of the heating carriage 400. Accordingly, the worker can produce the electrical heating sheet 600 with more easiness and convenience. Therefore, a yield of the electrical heating sheet 600 is improved.

[68] Furthermore, in the present invention, the plurality of carbon lines (C) are accurately and sequentially supplied to be at a predetermined interval through the guide rings 350 of the side plate 300 and the cross bar 310. Accordingly, as shown in FIG. 14, the electric heating sheet 600 of a high quality where the carbon lines (C) are constantly arranged can be produced, and the carbon lines (C) arranged to be at a predetermined interval mutually offsets the electromagnetic waves, thereby greatly reducing the electromagnetic wave of the electric heating sheet 600 in total.

[69]

[70] <Electric heating sheet>

[71] FIG. 13 is a magnified sectional view illustrating the electric heating sheet 600 produced through the method and apparatus for manufacturing the electric heating sheet according to the present invention. As shown, the inventive electric heating sheet 600 mainly includes the upper sheet 610, the lower sheet 620, the first to third electrical conductive tapes 630, 631, and 632, the intermediate member 640, and the carbon line (C).

[72] First, the upper sheet 610 and the lower sheet 620 serve as outer covers, and preferably employ a transparent synthetic resin film. The thermosetting adhesive is coated on a bottom surface of the upper sheet 610 and a top surface of the lower sheet 620 so that the upper sheet 610 and the lower sheet 620 can be integrally pressed by heating and pressurization.

[73] The first and third electrical conductive tapes 630 and 632 serve as the conductive plates for supplying the positive (or negative) current to the carbon line (C) built in between the upper sheet 610 and the lower sheet 620. The first and second electrical conductive tapes 630 and 631 are adhered to the bottom surface of the upper sheet 610 with the gap (G), and the third electrical conductive tape 642 is adhered to the top surface of the lower sheet 620 to be positioned at a direct lower side of the first electrical conductive tape 630.

[74] The intermediate member 640 is adhered between the first and third electrical conductive tapes 630 and 632, and performs a function of electrical insulation. In an exemplary embodiment of the present invention, the intermediate member 640 includes the electrical insulating tape 641 having the top surface and the bottom surface on which the thermosetting adhesive is coated; the fourth and fifth electrical conductive tapes 643 and 644 each adhered to the top surface and the bottom surface of the electrical insulating tape 641; and the electric wires adhered to the top surface of the fourth electrical conductive tape 643 and the bottom surface of the fifth electrical conductive tape 644.

[75] Meantime, in addition to the intermediate member 640 of FIG. 13, as shown in FIG.

15, the present invention can also employ the intermediate member 640 including the electrical insulating tapes 642 each adhered to the top surface and the bottom surface of the double sided tape 646 and each having one surface on which the thermosetting adhesive is coated.

[76] As shown in FIG. 13, in the intermediate member 640, it is desirable that the electrical insulating tape 641 and the fourth and fifth electrical conductive tapes 643 and 644 have the same widths as the first and third electrical conductive tapes 630 and 632 but, as shown in FIG. 16, the electrical insulating tape 641 can have a little greater width than the first and third electrical conductive tapes 630 and 632 as well.

[77] The carbon line (C) is a heating element electrically conducted with the first to fifth electrical conductive tapes 630, 631, 632, 641, and 643 through the electric wires 645, and emitting the heat. Among the carbon lines (C), the carbon line (C) connected with a positive (or negative) terminal is built in and pressed between the first and fourth e lectrical conductive tapes 630 and 643, and the carbon line (C) connected with a negative (or positive) terminal is built in and pressed between the third and fifth electrical conductive tapes 632 and 644.

[78] As shown in FIG. 14, the carbon lines (C) are equally arranged in plural to be at an interval of about 8 cm to 15 cm to minimize generation of the electromagnetic wave. Through the carbon line (C), the electric heating sheet 600 evenly emits the heat, and mutually offsets the electromagnetic waves generated from the respective carbon lines (C), thereby minimizing the generation of the electromagnetic waves.

[79] As shown in FIG. 13, the above-constructed electric heating sheet 600 not only adheres and presses the carbon lines (C) by the upper and lower sheets 610 and 620 but also firmly adheres and presses the carbon lines (C) between the first and fourth electrical conductive tapes 630 and 643 and between the third and fifth electrical conductive tapes 632 and 644. Accordingly, flow of the carbon line (C) is prevented. Therefore, the short-circuit between the carbon lines (C) is fundamentally prevented, thereby enhancing conductivity of the electric heating sheet 600 and greatly improving an electrical stability.

[80] In the inventive electric heating sheet 600, the electrical insulating tape 641 to which the fourth and fifth electrical conductive tapes 643 and 644 and the electric wires 645 are adhered is used as the intermediate member 640. Therefore, the carbon lines (C) are up/down adhered and firmly fixed, and the first and second electrical conductive tapes 630 and 631 can be also prevented from their possibilities of the short circuit, thereby realizing a stability of an insulating structure.

[81] In addition, the inventive electric heating sheet 600 employs the upper and lower sheets 610 and 620 formed of the transparent synthetic resin. Therefore, a work of adhering the first to third electrical conductive tapes 630, 631, and 632, the intermediate member 640, and the carbon line (C) can be easily performed in execution, and an adherence process can be confirmed, thereby greatly improving workability.

[82] Meantime, in the most preferable example, the present invention uses the carbon line (C) being a quasi-one-dimensional fiber semiconductor of Korean Patent No. 10-0412340 but, besides the carbon line (C), can use other known carbon lines.

[83] While the present invention has been described and illustrated herein with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention that come within the scope of the appended claims and their equivalents.

Claims

[1] A method for manufacturing an electric heating sheet, the method comprising the steps of: supplying an upper sheet 610 and a lower sheet 620; receiving carbon lines (C) in both lateral directions, and maintaining the received carbon lines (C) to be arranged at a predetermined interval while supplying the carbon lines (C) between the upper sheet 610 and the lower sheet 620; heating while carrying the upper sheet 610 and the lower sheet 620; adhering a first electrical conductive tape 630 to the upper sheet 610 heated and carried; adhering a second electrical conductive tape 631 to the upper sheet 610, and adhering a third electrical conductive tape 632 to the lower sheet 620; adhering an intermediate member 640 for electrical insulation to the first electrical conductive tape 630 of the upper sheet 610; pressing the upper sheet 610 having the intermediate member 640, and the lower sheet 620; and cutting the press-completed electric heating sheet 600 at a predetermined size.

[2] The method according to claim 1, wherein the intermediate member 640 comprises: an electrical insulating tape 641; fourth and fifth electrical conductive tapes 643 and 644 adhered to a top surface and a bottom surface of the electrical insulating tape 641; and electric wires 645 adhered to the fourth and fifth electrical conductive tapes 643 and 644.

[3] The method according to claim 1, wherein the intermediate member 640 comprises: a double sided tape 646; electrical insulating tapes 642 adhered to a top surface and a bottom surface of the double sided tape 646, respectively; fourth and fifth electrical conductive tapes 643 and 644 adhered to a top surface and a bottom surface of the electrical insulating tapes 642; and electric wires 645 adhered to the fourth and fifth electrical conductive tapes 643 and 644.

[4] An apparatus for manufacturing an electric heating sheet, the apparatus comprising: a body 200 having an upper sheet reel 210 and a lower sheet reel 220, and having a carriage table; a carbon-line guide unit installed at the body 200 and guiding sequentially supplied carbon lines (C); heating carriages 400 installed at one sides of the body 200, and heating an upper sheet 610 and a lower sheet 620 supplied from the upper and lower sheet reels

210 and 220, respectively; and press rollers 500 installed at the body 200, and pressing the upper sheet 610 and the lower sheet 620 guided by and coming from the heating carriages 400.

[5] The apparatus according to claim 4, wherein the carbon-line guide unit comprises: side plates 300 installed at both sides of the heating carriage 400 and having a plurality of guide rings 350 such that the carbon lines (C) can be smoothly supplied in lateral directions; and cross bars 310 having a plurality of guide rings 350 and installed to be adjacent in transverse directions to the upper/lower heating carriages 400 such that the carbon lines (C) can be received from the side plates 300 and stably supplied to the press rollers 500.

[6] An electric heating sheet comprising: an upper sheet 610 and a lower sheet 620; first, second, and third electrical conductive tapes 630, 631, and 632 adhered to a bottom surface of the upper sheet 610 and a top surface of the lower sheet 620; an intermediate member 640 adhered between the first and third electrical conductive tapes 630 and 632; and carbon lines (C) each provided between the first electrical conductive tape 630 and the intermediate member 640, and between the third electrical conductive tape 632 and the intermediate member 640.

[7] The sheet according to claim 6, wherein the upper sheet 610 and the lower sheet

620 are formed of a transparent synthetic resin material and each has one surface on which thermosetting adhesive is coated.

[8] The sheet according to claim 6, wherein the intermediate member 640 comprises: an electrical insulating tape 641 having both surfaces on which thermosetting adhesives are coated; fourth and fifth electrical conductive tapes 643 and 644 adhered to the top surface and the bottom surface of the electrical insulating tape 641; and electric wires 645 adhered to the fourth and fifth electrical conductive tapes 643 and 644.

[9] The sheet according to claim 6, wherein the intermediate member 640 comprises: a double sided tape 646; electrical insulating tapes 642 each adhered to a top surface and a bottom surface of the double sided tape 646 and having one surface on which thermosetting adhesive is coated; fourth and fifth electrical conductive tapes 643 and 644 adhered to a top surface and a bottom surface of the electrical insulating tape 642; and electric wires 645 adhered to the fourth and fifth electrical conductive tapes 643 and 644.

[10] The sheet according to claim 8 or 9, wherein the electrical insulating tapes 641 and 642 have transparencies.