KR101036724B1 - Manufacturing method of calorific plate and manufacturing device - Google Patents

Abstract

PURPOSE: A method for manufacturing a surface heater is provided to uniformly maintain carbon coating thickness and coating surface and to reduce heating deviation. CONSTITUTION: A method for manufacturing a surface heater comprises: a step of weaving warp of 800-1200 denier and weft of 130-1700 denier to form a fabric paper(S1); a step of mixing water, carbon black, P.V.A, dispersing agent, antifoaming agent, and antioxidant in weight ratio of 60-70:10-20:5-15:1-3:1-3:1-3 and stirring for 8-16 hours to prepare a coating mixture(S2); a step of pulverizing the coating mixture in a nanoparticluar state(S3); a step of impregnating the fabric paper in the carbon coating liquid(S5); and a step of transferring the both ends of the fabric in longitudinal direction and drying(S6).

Description

Planar heating element manufacturing method and manufacturing apparatus according to it {Manufacturing method of calorific plate and manufacturing device}

The present invention relates to a planar heating element manufacturing method and a manufacturing apparatus according to the present invention, and more particularly to a planar heating element manufacturing method using a carbon exhibiting heat generating characteristics by the electrical resistance and a manufacturing apparatus according to it.

In general, the planar heating element is commercialized using the characteristics that carbon generates heat by resistance when it is energized, and is easy to manufacture and easy to control temperature. Widely used.

Conventionally, the planar heating element forms a heat generating fabric by cross weaving a carbon fiber yarn having self-resistance, and by arranging one or more pairs of electrodes in the longitudinal direction or the transverse direction to supply current to the electrodes, the carbon fiber yarn self-resistance is achieved. Although heat is generated, the manufacturing cost is inevitably high because carbon fiber yarns are expensive, and in particular, carbon fiber yarns have high elasticity and low flexibility, and thus are not applicable to bending or folding applications including heating sheets. to be..

Looking at the planar heating element disclosed in the prior art, in Korean Patent Publication No. 2006-0124866, a cotton yarn as a yarn to cross weave at regular intervals, weaving by wrapping the weft on the warp, the fabric woven in a conductive liquid carbon 1, 2 , Impregnated 3 times to produce a carbon coated heating fabric.

Further, in Patent Registration No. 10-0783184, carbon black is immersed in cotton or blended fabric and given a certain resistance to the fabric, and a plurality of copper wires are used as the electrode wires to the modulated fabric of the heating fabric woven in plain or twill weave. Therefore, it is possible to reduce power consumption, far-infrared emission, electromagnetic wave prevention, wet construction, and to handle easily.

However, the prior art is a technique for producing a planar heating element by coating a carbon component on the fabric, but due to the coating thickness and coating surface of the non-uniform carbon, the defect rate is increased, which leads to a performance degradation.

That is, since the carbon coated fabric paper is transported in the transverse direction to perform the drying process, the liquid coating liquid flows to the bottom of the fabric by gravity, resulting in a thinner top coating thickness and a thicker bottom coating thickness. Due to the different coating thickness, the resistance value is variable, causing a problem of severely generated heating deviations for each zone.

In addition, as the coated carbon is freely deformed until it solidifies through a drying process, it is not tightly adhered to the textile paper and solidified in a lifted or slack state, so that the partial electric resistance value is changed and carbon is dropped into the particulate state during use, resulting from discharge. There was a problem that safety was not secured from the danger of fire.

In addition, when the coated fabric is not kept taut during the drying process and the carbon solution solidifies in a wrinkled or partially loose state, the length of the carbon coated yarn between the electrodes is varied for each zone to generate a heat generation deviation. When carrying out the PET coating process, the coated surface was formed as an uneven surface, which leads to poor coating.

Accordingly, the present invention has been conceived to solve the above problems, by maintaining the carbon coating thickness and coating surface uniformly to ensure the heating safety while reducing the heating deviation due to different resistance values, and PET coating, which is a post-process An object of the present invention is to provide a planar heating element manufacturing method and a manufacturing apparatus according to the method for preventing coating defects due to wrinkles of the carbon coated fabric paper during the process.

In order to achieve the above object, the present invention is characterized in that the step of weaving 800 ~ 1200 denier warp yarn and 1300 ~ 1700 denier weft yarns together with at least two poles (T1) in the inclined direction to form a woven paper (T) ( S1); Water: carbon black: PVA: dispersant: antifoam: antioxidant ratio of 60 to 70: 10 to 20: 5 to 15: 1 to 3: 1 to 3: 1 to 3 by weight ratio, and then 8 to 16 hours Aging aging to prepare a coating mixture (S2); Grinding the coating mixture into a nanoparticle state (S3); Preparing a carbon coating solution by mixing the pulverized coating mixture: E.V.A: binder at a ratio of 70 to 80:15 to 35: 1 to 3 by weight (S4); Impregnating and coating the textile paper (T) on the carbon coating liquid (S5); A tenter step (S6) of transferring the carbon coating liquid coated textile paper (T) in a longitudinal direction while pulling the ends; And heat-pressing the both sides of the fabric paper (T) dried after the coating (S7).

At this time, the warp and weft is characterized in that using the herakron yarn or TC cotton yarn.

In addition, the textile paper (T) is characterized in that the inclination per area: the number of weaving weft yarn is formed in a ratio of 1: 1 to 2.

In addition, the textile paper (T) is characterized in that the tenter fixing belt (T2) is further provided in the inclined direction at the edge portion.

In addition, the tenter step (S6) is characterized in that it is continuously performed one to three times.

In the planar heating element manufacturing apparatus provided with an unwinder unit (U) for supplying textile paper (T) and a rewinder unit (R) for winding up the coated textile paper (T), the unwinder unit (U) is provided in front. It is installed in the carbon coating liquid is stored, the impregnation tank 10 is provided with an impregnation roller 12 for guiding the textile paper (T) to pass through the carbon coating liquid; A pair of press rollers 20 installed on the impregnation tank 10 and dewatering the textile paper T coated with the carbon coating liquid; A pair of transfer belts 32 which are installed on the press roller 20 and provided with turner pins 32a so as to transfer them in the longitudinal direction while pulling both ends of the fabric paper T in a clamped state, A tenter unit 30 having a dry room 34 for supplying hot air in a state in which the belt 32 is accommodated; And a direct heat drying unit (40) having one to three heating rollers (42) to be directly interviewed with the coated fabric paper (T) passing through the tenter unit (30) to heat-dry. .

At this time, the pair of conveying belt 32 is characterized in that the longitudinal direction is installed in the longitudinal direction is provided with a carbon coating liquid coated textile paper (T) is transported in the longitudinal direction and dried.

In addition, the dry room 34 of the tenter unit 30 has a dry room body 36 provided with guide rollers 36a for guiding the transport belt 32 to move in a state in which both sides are open, and It is characterized in that it comprises a heating door 38 is provided to open and close both sides of the dry room body 36, the heater 38a is installed therein.

In addition, the dry room 34 of the tenter portion 30 is characterized in that it is formed in the upper narrow lower light (上 狹 下 狹) structure is expanded in width from top to bottom.

In addition, it characterized in that the heat-forming part 50 is provided with a pair of heating rollers 52 are installed to heat-compress both sides of the fabric paper (T) passing through the heat-drying unit 40.

According to the above configuration and operation, the present invention is different from each other as the carbon coated textile paper is transported in the longitudinal direction so that the drying process is performed to prevent the carbon coating liquid from flowing down during the transfer, thereby maintaining the carbon coating thickness and coating surface uniformly. Heat resistance is secured by preventing heat deviation due to resistance value, and the carbon coated fabric is heat-pressed by the heat injection molding part to prevent wrinkles on the fabric and lifting of carbon coating. It is effective in preventing coating defects.

1 is a block diagram schematically showing a method for producing a planar heating element according to the present invention.
Figure 2a to 2b is a block diagram showing the fabric produced by the planar heating element manufacturing method according to the present invention.
Figure 3 is a schematic view showing the planar heating element manufacturing apparatus according to the invention as a whole.

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

1 is a block diagram schematically showing a planar heating element manufacturing method according to the present invention, Figures 2a to 2b is a block diagram showing a fabric paper produced through the planar heating element manufacturing method according to the present invention.

The present invention relates to a planar heating element manufacturing method and a manufacturing apparatus according to this, wherein the planar heating element manufacturing method and the manufacturing apparatus according to the heat generation while reducing the heating deviation due to different resistance values by maintaining the carbon coating thickness and coating surface uniformly In order to ensure safety and prevent coating defects due to wrinkles of the carbon coated fabric paper when performing the PET coating process, the planar heating element manufacturing method is the fabric paper weaving step (S1), the coating mixture manufacturing step (S2) , Including the grinding step (S3), carbon coating solution manufacturing step (S4), impregnating coating step (S5), tenter step (S6), heat pressing step (S7), the detailed description thereof will be described step by step in the following description It demonstrates in detail as follows.

1. Textile paper weaving stage

The weaving paper weaving step (S1) according to the present invention forms a fabric paper (T) by enclosing the polar wire (T1) in at least two places in the inclined direction while weaving 800 to 1200 denier warp yarn and 1300 to 1700 denier weft yarn.

The warp and weft yarns are made of herakron yarn or TC cotton yarn and are woven into plain or fray tissue using a loom. And weaving integrally by inserting the pole line (T1) at both ends of the fabric paper (T), the pole line (T1) is a stone line coated stone line, as shown in Figure 2a each of the 4 to 16 pieces in the inclined direction on both sides of the paper (T) Alternatively, as shown in FIG. 2B, a pair of pole lines T1 are additionally added to the center portion to cut the fabric paper T in half. At this time, the pole line T1 is not inclined by the double beam device or the grill stand, and the adhesion between the light and weft yarn and the pole line T1 is increased during the urethane coating, PET coating, and PVC coating process. For this reason, the polar wire T1 is preferably enclosed together with the TC cotton yarn.

And, the fabric paper (T) is an area (for example, 1 inch * 1 inch long) inclination: the number of weaving weft yarn is formed in a ratio of 1: 1 to 2, and the denier weft yarn is used, preferably higher than the inclination, preferably It is preferable to arrange the inclination of 1000 denier at 1 mm intervals and to arrange the weft of 1500 denier at 0.6 mm intervals. Accordingly, the number of wefts per area of the paper (T1) increases as well as the inclination, and as the wefts are formed with thicker deniers than the inclination, the electrical conductance is improved through the weft yarns directly connected to the pole line, and the electrical safety is secured while the electricity is flowing.

In addition, the fabric paper (T) is further woven tenter fixing band (T2) in the oblique direction at the edge portion. The tenter fixing strip T2 is woven in the oblique direction outside the pole line T1 to secure a position to which the tenter pin 32a is to be fastened in the tenter step S6 described later. Accordingly, as the tenter pin 32a is fastened to the tenter fixing belt T2, the pulling force of the tenter pin 32a is concentrated on the tenter fixing belt T2 as the fabric paper T is pulled in both directions. T1) or the edge deformation and damage of the textile paper T are prevented. And the tenter fixing strip (T2) is removed through a separate post process after the tenter process is completed.

2. Preparation of coating mixture

Coating mixture manufacturing step according to the invention (S2) is water: carbon black: PVA: dispersant: antifoam: antioxidant ratio of 60 to 70: 10 to 20: 5 to 15: 1 to 3: 1 to 3: 1 to 1 After blending in 3 weight ratio, stirring and aging for 8 to 16 hours to prepare a coating mixture.

Here, the dispersant plays a role of evenly decomposing the raw material, the antifoaming agent is added to prevent the foaming during stirring, PVA is used to disperse for 5-10 minutes by stirring in room temperature water using JP-18, dissolution efficiency Agitated for 30 to 60 minutes at 90-95 degrees to increase the temperature, antioxidants use kumanox-13 and serve to prevent oxidation of the copper wire used as carbon black and polar wire.

At this time, the coating mixture is added to the water, carbon black, PVA, dispersant, antifoaming agent, antioxidant to the stirrer and stirred for a long time over 8 to 16 hours, which is that each mixture particles are evenly blended by the heat generated during stirring. Of course, there is an advantage that the mixed components including water into the carbon black particles quickly penetrates easily in the subsequent grinding step.

3. Grinding of the coating mixture

In the grinding step S3 according to the present invention, the coating mixture is pulverized into a nanoparticle state. The coating mixture blended through the manufacturing step is put into a grinder to grind to 1 ~ 500 nanoparticles.

4. Manufacturing step of carbon coating liquid

Carbon coating solution manufacturing step (S4) according to the present invention is prepared by mixing the ratio of the crushed coating mixture: E.V.A: binder in a weight ratio of 70 ~ 80: 15 ~ 35: 1-3. EVA evenly distributes the carbon black in the impregnating coating step (S5) to be described later and improves the adhesive strength, and the binder performs the function of improving the adhesion and wear resistance of the carbon black, and is selected from BP-20V and BP-22V. do.

5. Impregnation Coating Step

Impregnation coating step (S5) according to the present invention is impregnated coating paper (T) to the carbon coating liquid. Impregnating the paper coating (T) in the impregnation tank (10) in which the carbon coating liquid is stored to absorb and coat the carbon coating liquid between the tissue (T) tissue. At this time, the fabric paper (T) is carried out by moving the impregnation roller (12) installed in the impregnation tank (10), the impregnation process is carried out, the fabric paper passing through the impregnation tank (10) is pressurized by a pair of dewatering roller overcoating The carbon coating liquid is dehydrated and transferred to the tenter stage, which is the next process.

On the other hand, the impregnating coating step (S5) is preferably carried out one to three times with the tenter step (S6) to be described later, depending on the carbon coating thickness.

6. tenter stage

The tenter step (S6) according to the present invention is transported in the longitudinal direction while pulling the both ends of the carbon coating paper (T) coated with the carbon coating liquid and dried. In the impregnating coating step (S5) through the impregnation tank (10) to transfer the carbon coating paper coated textile paper (T) in the longitudinal direction and hot air drying, wherein the fabric paper (T) in the longitudinal direction while the tenter portion (30) As it is pulled in both sides by the tension, wrinkles of the textile paper T are prevented during the drying process, and in particular, the carbon coating liquid is coated on both sides of the textile paper T as it flows in the longitudinal direction of the textile paper T by gravity. Since the carbon thickness is constant, the urethane coating, the PET coating, and the PVC coating process to finish the surface, which is a post process, have an advantage of being smoothly processed while preventing the occurrence of irregularities on the upper and lower surfaces.

In addition, even if the carbon coating liquid flows down in the direction of gravity on the textile paper (T), as it is dropped into the impregnation tank 10 and collected, the external loss of the carbon coating liquid is prevented, leading to a reduction in manufacturing cost.

On the other hand, the tenter step (S6) is successively performed one to three times depending on the number of repetitions of the impregnating coating step, that is, the coating thickness and the drying state of the carbon coating liquid.

7. Heating and pressing step

Heat compression step (S7) according to the present invention by heat pressing the both sides of the fabric paper (T) dried after the coating. At this time, a heating roller is used to enable heat compression while the fabric paper (T) is continuously transferred. Here, the paper paper (T) passes through the heating rollers (42) spaced at one to three places in a jig direction or faces each other. Heat-compression is carried out in the form of passing between a pair of heating rollers 52 arranged so as to pass. Accordingly, the carbon coating liquid is secondarily dried by the high temperature while the textile paper T passes through the heating roller 42, and the carbon coating liquid is pressurized by the heating roller to be closely formed on the textile paper T. In addition to being prevented, the overall coating thickness is kept constant.

Therefore, the carbon coating thickness and coating surface are kept uniform to prevent heat deviation due to different resistance values and to ensure thermal safety, and in particular, to prevent coating defects due to wrinkles of carbon coated fabric paper when performing the PET coating process, which is a post process. There is an advantage.

Figure 3 is a block diagram showing an overall planar heating element manufacturing apparatus according to the present invention.

The planar heating element manufacturing apparatus according to the present invention is provided with an unwinder unit (U) for supplying the textile paper (T), and a rewinder unit (R) for winding the coated textile paper (T), and the carbon coating thickness and coating surface Impregnation tank (10) in order to maintain the uniformity, to ensure the heating safety while reducing the heating deviation due to different resistance values, and to prevent coating defects due to wrinkles of the carbon coated fabric paper when performing the PET coating process, a post-process The press roller 20, the tenter 30, and the direct drying unit 40 is composed of a main configuration.

Unwinder unit (U) and rewinder unit (R) of the present invention is a device for supplying or winding textile paper (T) while the bobbin rotates by the driving force of the motor, the unwinder unit (U) at the beginning of the production line It is arranged to supply the tissue paper (T), the rewinder portion (R) is located at the rear end of the manufacturing line to wind up the textile paper (T) is completed after the coating is complete.

In addition, the impregnation tank 10 according to the present invention is installed in front of the unwinder unit (U) is provided with a carbon coating liquid is stored, the impregnation roller 12 for guiding the textile paper (T) to pass through the carbon coating liquid. The impregnation tank 10 is a tank having an open top, and a carbon coating liquid is stored therein, and an impregnation roller 12 is installed to be immersed in the carbon coating liquid. The impregnation roller 12 guides the fabric paper T supplied through the unwinder unit U to be impregnated with the carbon coating liquid of the impregnation tank 10, one of which is independently installed or two of which are disposed to face each other.

On the other hand, one side of the impregnation tank 10 is provided with a water level gauge is preferably configured to ring the warning light or the carbon coating liquid prepared separately stored when the carbon coating liquid is lowered below the set water level.

In addition, the press roller 20 according to the present invention is provided as a pair is installed on the impregnation tank 10, the carbon coating liquid coated textile paper (T) is dehydrated. The pair of press rollers 20 are installed to drive in opposite directions to each other and press the fabric paper passing through the impregnation tank 10 at both ends, so that the carbon coating liquid overcoated on the fabric paper T is dehydrated to maintain a constant coating thickness. do. The dehydrated carbon coating liquid is dropped by gravity and collected on the impregnation tank 10.

In addition, the tenter portion 30 according to the present invention is installed on the press roller 20, the turner pin (32a) is provided to transfer in the longitudinal direction while pulling to both sides in a clamping state of both ends of the paper (T) A pair of transfer belt 32 and a dry room 34 for supplying hot air in a state of receiving the transfer belt 32 is provided.

At this time, the dry room 34 of the tenter portion 30 has a dry room body 36 is provided with a guide roller 36a for guiding the transport belt 32 to trajectory movement in an open state on both sides; It is configured to include a heating door 38 is provided to open and close both sides of the dry room body 36, the heater 38a is installed therein.

Here, the transfer belt 32 is installed so as to track movement by a plurality of rollers in the dry room 34, the tenter fixing belt (T2) formed on both ends of the fabric paper (T) protruding to form a plurality of tenter outward It is transferred with clamping.

At this time, the pair of conveying belt 32 is installed in the longitudinal direction in the longitudinal direction of the carbon coating liquid coated textile paper (T) is transferred in the longitudinal direction and the drying process is performed. Therefore, even if the carbon coating liquid flows down through the paper (T), even if it flows down by gravity, the carbon coating liquid is coated on both sides of the paper (T) because it remains on the paper (T) without being lost to the outside of the carbon coating liquid. There is an advantage to remain constant.

In addition, the pair of conveying belt 32 is formed so that the width gradually expands toward the upper portion so that the fabric paper (T) is pulled tightly to both sides during the transfer to prevent wrinkles during drying. And the paper paper (T) has a structure that is transported from the lower to the upper side by moving the transport belt 32 is traversed to move again from the upper side to the lower side.

In addition, the dry room 34 of the tenter part 30 is formed in an upper and lower light structure in which a width thereof extends from the upper part to the lower part. As the heat generated from the lower portion of the dry room 34 formed in the upright structure is transferred to the upper portion, the heat is concentrated in the narrow space, so that the drying efficiency is improved while the fabric paper is transferred to the upper portion. Since the heat is collected in the upper part due to the structural characteristics of the dry room 34 as described above, the output of the upper heater 38a when the heater 38a is installed only in the lower part of the dry room 34 or in two upper and lower parts. Even if it is regulated downward, energy saving effect can be expected while preventing the drying efficiency from falling.

On the other hand, the tenter 30 is preferably concentrated to the installation position of the heater 38a in the lower part of the dry room in consideration of the phenomenon that the hot air generated by the convection phenomenon is transferred to the upper portion.

As such, the tenter part 30 is installed upright, impregnated fabric paper (T) is moved in the longitudinal direction, and as the tenter process is performed, the space utilization according to the tenter part 30 is improved, so that equipment can be constructed in a narrow place. There is an advantage.

In addition, the direct heat drying unit 40 according to the present invention is provided with one to three heating rollers 42 so as to be directly interviewed with the coated fabric paper T passing through the tenter part 30 to heat and dry. Heating roller 42 is heated inside the heating line is built 140 ~ 150 degrees, As shown in FIG. 3, it is preferable to install the woven paper T in three places in a zigzag arrangement so as to enlarge the contact area with the heating roller 42 during transfer.

Thus, the textile paper T is heated in the state of being directly interviewed with the heating roller 42 while passing through the direct heat drying unit 40, and the second coating is dried, as well as the carbon coating liquid is coated by the adhesive force during the interview with the heating roller 42. It adheres long on T).

In addition, the thermal forming unit 50 is provided with a pair of heating rollers 52 are installed to heat-compress both sides of the textile paper (T) passing through the direct thermal drying unit 40 according to the present invention. The direct heat molding part 40 is provided with a pair of heating rollers 52 to face each other, and the heating roller 52 is heated to 150 to 180 degrees by the heating line is built therein. Accordingly, as the textile paper T is heated and compressed while passing between the pair of heating rollers 52, the textile paper and the carbon coating liquid are pressurized to be kept flat, and the lifting phenomenon of the carbon coating liquid is prevented.

10 impregnation tank 20 press roller 30 tenter portion
40: heat drying part 50: heat molding part

Claims (9)

Forming a woven paper (T) by weaving the polar wire (T1) together in at least two places in the inclined direction while weaving 800 to 1200 denier warp yarns and 1300 to 1700 denier weft yarns (S1);
Water: carbon black: PVA: dispersant: antifoam: antioxidant ratio of 60 to 70: 10 to 20: 5 to 15: 1 to 3: 1 to 3: 1 to 3 by weight ratio, and then 8 to 16 hours Aging aging to prepare a coating mixture (S2);
Grinding the coating mixture into a nanoparticle state (S3);
Preparing a carbon coating solution by blending the pulverized coating mixture: EVA: Binder ratio in a ratio of 70 to 80:15 to 35: 1 to 3 by weight (S4);
Impregnating and coating the textile paper (T) on the carbon coating liquid (S5);
A tenter step (S6) of transferring the carbon coating liquid coated textile paper (T) in a longitudinal direction while pulling the ends; And
Method of producing a planar heating element, characterized in that it is manufactured through the step (S7) by heat-compressing both sides of the dried fabric paper (T) after the coating. The method of claim 1,
The warp and weft yarn planar heating element manufacturing method characterized in that the use of Herakron yarn or TC cotton yarn. The method of claim 1,
The fabric paper (T) is inclined per area: the number of weaving plane weaving method, characterized in that the number of weaving is formed in a ratio of 1-2. The method of claim 1,
The fabric paper (T) is a planar heating element manufacturing method characterized in that the tenter fixing band (T2) is further provided in the inclined direction at the edge portion. In the planar heating element manufacturing apparatus is provided with an unwinder unit (U) for supplying textile paper (T), and a rewinder unit (R) for winding up the coated textile paper (T),
An impregnation tank 10 installed at the front of the unwinder unit U to store a carbon coating liquid and having an impregnation roller 12 for guiding the paper paper T to pass through the carbon coating liquid;
A pair of press rollers 20 installed on the impregnation tank 10 and dewatering the textile paper T coated with the carbon coating liquid;
A pair of transfer belts 32 and a transfer belt 32 which are installed on the press roller 20 and provided with turner pins 32a so as to transfer them while pulling them to both sides while clamping both ends of the textile paper T. Tenter unit 30 is provided with a dry room 34 for supplying hot air in a state of receiving; And
The direct heat drying unit 40 is provided with one to three heating rollers 42 so as to be directly interviewed with the coated fabric paper T passing through the tenter unit 30 to heat-dry. Heating element manufacturing apparatus. The method of claim 1,
The conveying belt 32 is a longitudinal heating element manufacturing apparatus characterized in that the longitudinal direction is provided to transport the paper (T) coated with a carbon coating liquid in the longitudinal direction. The method according to claim 5 or 6,
The dry room 34 of the tenter part 30 has a dry room body 36 having a guide roller 36a for guiding the transport belt 32 to move in a locus with both sides open. Planar heating element manufacturing apparatus characterized in that it comprises a heating door (38) which is provided to open and close both sides of the main body 36 and the heater (38a) is installed therein. The method according to claim 5 or 6,
Dry room 34 of the tenter portion 30 is a planar heating element manufacturing apparatus, characterized in that formed in the upper and lower beams (上 狹 下 廣) structure is widened from the top to the bottom. 6. The method of claim 5,
Apparatus for producing a planar heating element, characterized in that the thermal forming unit 50 is provided with a pair of heating rollers 52 are installed to heat-compress both sides of the fabric paper (T) passing through the direct heat drying unit (40).

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