KR101736791B1 - Manufacturing method of heating seat and apparatus for producing thereof - Google Patents

Abstract

A) weaving a ramp fabric comprising weft yarn and one or more metal yarns comprising at least one carbon coated woven fabric (W1) and a general weft yarn (W2); b) cutting the woven fabric and connecting the power supply line to the pole line portion with the metal yarn at the end of the fabric as an electrode line; And c) coating the entire surface of the fabric including the fabric and the power supply line with an outer covering to shield the fabric from the outside, wherein in the step a), the carbon coated woven fabric (W1) W2) satisfies the following formula (1).
[Formula 1]
_{0.2 ≤ d 1 / d 2 ≤} 0.8
(Where d ₁ is the denier of the carbon coated weft yarn W ₁ and d ₂ is the denier of the normal weft yarn W ₂ )

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a heating sheet,

The present invention relates to a method of manufacturing a heat generating sheet and an apparatus for manufacturing the same, and more particularly, to a method of manufacturing a heat generating sheet and a method of manufacturing the heat generating sheet by controlling a fineness of a weft, And a method of manufacturing the heat generating sheet and a manufacturing apparatus therefor.

The automobile is provided with a car seat inside the automobile in which the driver or the rider can sit comfortably to ride and sit. Such an automobile seat may be composed of a natural material such as leather or cotton, a seat cover made of synthetic resin such as polyester or polyamide (nylon), and a cushion member having a cushion for protecting a passenger from a comfortable sitting and accident, As the industry gradually develops, the automobile industry continues to develop, and a lot of safer, more convenient and comfortable automobile seats are developed and sold not only for driving performance but also for riding comfort of driver and rider.

In recent years, when the occupant seats on the seat for automobiles due to the low temperature inside the automobile in the winter, the temperature of the automobile is lowered, the automobile is started, the heater is operated, A heat generating sheet for automobiles has been developed which gives a heat-generating function to an automobile seat.

The heating function of a conventional automobile seat is a form in which a heating element in the form of a conductive metal wire such as a copper wire or silver is embedded and a cushion layer or a fabric and a nonwoven fabric layer using a sponge or a synthetic resin are wrapped thereon. Or a metallic hot wire method in which a metal sheet is attached to a certain shape and a temperature sensor and a heat insulating device are mounted inside to adjust the heat generation amount. Such a heat-generating mat for a vehicle or a conductive fiber is disclosed in Korean Patent Nos. 10-1372543 and 10-2006-0124866.

However, the problem of this prior art is that the metal thread may be cut off due to friction with the passenger, or the sensor may malfunction, resulting in low durability, increased heat generation, burns, fire, and the like. In addition, there is a disadvantage that the riding feeling may be lowered due to the stiff texture unique to the metal yarn or the carbon-coated yarn, and the smoothness is poor and the planarity is difficult to maintain. In particular, since 10-2006-0124866 is coated with carbon particles on the entire surface, there is a disadvantage that the flexibility is greatly reduced, and there is a problem that surface cutting occurs in the repeated test.

Therefore, there is a need to develop a technique for solving the above problems.

Korean Patent No. 10-1372543 (Feb. 28, 2014) Korean Patent Publication No. 10-2006-0124866 (December 06, 2006)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a carbon fiber- The present invention provides a method of producing a heat generating sheet which suppresses cutting and which includes a polyalkylene oxide in the treatment liquid to improve surface smoothness.

Another object of the present invention is to provide a heating sheet manufacturing apparatus capable of controlling a nonuniform planar phenomenon that may occur during weaving by introducing a guide upon introduction of a weft.

The present invention relates to a method of manufacturing a heat generating sheet and an apparatus for manufacturing the same.

One aspect of the present invention is

a) fabricating a fabric by plain weaving a warp yarn comprising weft yarn comprising at least one carbon coated weft yarn (W1) and general weft yarn (W2) and at least one metal yarn;

b) cutting the woven fabric and connecting the power supply line to the pole line portion with the metal yarn at the end of the fabric as an electrode line; And

c) coating the entire surface woven fabric including the fabric and the power supply line with an outer covering and shielding the woven fabric from the outside;

Wherein the carbon coated weft (W1) and the general weft yarn (W2) satisfy the following formula (1) in the step (a).

[Formula 1]

_{0.2 ≤ d 1 / d 2 ≤} 0.8

(Where d ₁ is the denier of the carbon coated weft yarn W ₁ and d ₂ is the denier of the normal weft yarn W ₂ )

In the present invention, the carbon coated weft yarn (W1) is selected from the group consisting of (1) 5 to 30% by weight of at least one carbon component selected from carbon black, furnace black, graphene, carbon nanotubes, and carbon precursor, (2) polyvinyl alcohol, polyurethane, 40 to 70% by weight of at least one base resin selected from ethylene vinyl acetate copolymer, polyvinyl chloride and silicone, and 15 to 30% by weight of at least one additive selected from antioxidants, dispersants, surfactants and inorganic particles Or the like.

The metal filament may have a fineness of 1 to 200 denier and may be composed of at least one selected from silver, gold, copper, aluminum, nickel, chromium, iron, manganese, titanium, zinc and tin.

Another aspect of the present invention relates to a method for producing a heat generating sheet wherein 0.1 to 5% by weight of a polyalkylene oxide is further mixed in the treatment liquid.

Another aspect of the present invention is

A weaving unit 100;

A warp supply part 200 provided at the rear of the woven part 100 and composed of a metal yarn bobbin 210 for supplying metal yarn and a general warp bobbin 220 for supplying a warp yarn; And;

And a weft supply unit 300 provided at one side of the weaving unit 100 and composed of a carbon coated weft bobbin 310 and a general weft bobbin 320,

A guide 330 installed between the carbon coated weft bobbin 310 and the weaving unit 100 and supplying a weft yarn drawn from the carbon coated weft bobbin 310 to the weaving unit 100,

To a heat generating sheet manufacturing apparatus.

In the present invention, the heating sheet manufacturing apparatus may further include a weft cutter, and the guide 330 may guide the weft yarn from the carbon coated weft yarn bobbin 310,

An induction unit 331 for introducing a weft yarn drawn out from the carbon coated weft bobbin 310;

A first tension control unit 332 for grounding and passing the weft passed through the guide unit 331 to two metal plates;

A first guide hole 333 for passing the weft passed through the first tension adjuster 332 and suppressing the vibration of the weft yarn;

A second tension adjusting unit 334 for grounding and passing the weft having passed through the first guide hole 333 to two metal plates; And

A second guide hole 335 for passing the weft passed through the second tension adjuster 334 and supplying it to the weaving unit 100 and suppressing the vibration of the weft passed through the second tension adjuster 334, ;

. ≪ / RTI >

Further, in the present invention, the guide 330 can satisfy the following expression (2).

[Formula 2]

1.0 V ₁ ? V ₂ ? 1.1 V ₁

(V ₁ in the above equation 2 denotes the weft speed immediately after passing through the first tension adjuster 332, and V ₂ denotes the weft speed immediately after passing through the second tension adjuster 334).

The heat generating sheet according to the present invention can suppress the exposure of the carbon coated weft and control disconnection due to friction by controlling the fineness of the carbon coated weft yarn and the general weft yarn to a specific range. Further, since the fabric including carbon fiber is used as a heat source, human health hazards due to electromagnetic waves can be reduced, so that it can be applied to a heating sheet for automobile, a sofa and a cushion for home use, and a heating mat.

The heat generating sheet according to the present invention can eliminate the lack of flexibility which is characteristic of the coated yarn by introducing a guide for supplying carbon coated weft yarns at the time of production, and can improve the smoothness of the fabric.

FIG. 1 shows a heat generating sheet manufacturing apparatus according to an embodiment of the present invention.
2 shows a guide according to an embodiment of the present invention.
FIG. 3 illustrates a heating sheet not connected to a power source unit manufactured according to an embodiment of the present invention.
4 illustrates a heat generating sheet manufactured according to an embodiment of the present invention.
5 shows a cross section of a heating sheet woven according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings and specific examples. It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In addition, the following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the drawings presented below may be exaggerated in order to clarify the spirit of the present invention. Also, throughout the specification, like reference numerals designate like elements.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

As described above, in the conventional surface heating element, carbon fiber yarn is mainly used, and in order to solve the problem that the carbon fiber yarn is damaged or broken due to friction with the outside, By varying the fineness of yarn (weft, W1) and general weaving (W2), we minimize the external exposure of the carbon coated yarn, protect the carbon coated yarn from external impacts, adjust the calorific value by ramping the metal hot wire, The present invention has solved the above problems by developing a heat-generating sheet capable of maintaining a heat-generating function.

The method for manufacturing a heat generating sheet according to the present invention comprises

a) weaving a ramp fabric comprising at least one weft yarn and at least one metal yarn comprising at least one carbon coated weft yarn (W1) and a general weft yarn (W2);

b) cutting the woven fabric and connecting the power supply line to the pole line portion with the metal yarn at the end of the fabric as an electrode line; And

c) coating the entire surface woven fabric including the fabric and the power supply line with an outer covering and shielding the woven fabric from the outside;

. ≪ / RTI >

The carbon coated weft yarn (W1) according to the present invention comprises (i) 5 to 30% by weight of at least one carbon component selected from the group consisting of carbon black, furnace black, graphene, carbon nanotubes and carbon precursor, (2) polyvinyl alcohol, polyurethane, polyethylene , 40 to 70% by weight of at least one base resin selected from ethylene vinyl acetate copolymer, polyvinyl chloride and silicone, and 3 to 15% by weight of at least one additive selected from antioxidants, dispersants, surfactants and inorganic particles Or may be coated with a treatment liquid containing the same.

In the present invention, the carbon component is not limited to any kind as long as it is used in the art for coating conductive fibers. Examples of the carbon component include at least one carbon component selected from carbon black, furnace black, graphene, carbon nanotube, and carbon precursor.

In the present invention, the carbon component is not limited within the range that does not impair the object of the present invention, but a particle size of 0.0001 to 0.01 탆 is preferable because smooth weaving can be performed and no separation occurs.

In addition to the carbon component, an inorganic conductive filler may be further introduced to lower the resistance value. The inorganic conductive filler is not particularly limited within the range not impairing the object of the present invention, and conductive particles conventionally used in the technical field can be used.

Examples of the inorganic conductive filler include metal particles including gold, silver, nickel, copper, etc., particles obtained by plating or coating the metal components, or conductive fillers obtained by further coating the surface of the particles with the carbon component of the present invention. Specific examples thereof include magnesium oxide and silicon carbide. These may be used alone or in combination of two or more.

The amount of the conductive filler is not limited within the range that does not impair the object of the present invention. Preferably, the conductive filler is substituted by 1 to 50% by weight of 100% by weight of the carbon component.

In the present invention, the carbon component may be added in an amount of 5 to 30% by weight of the whole treatment liquid. If it is added in an amount of less than 5% by weight, the desired conductivity can not be sufficiently exhibited in the present invention. If it is added in an amount of more than 30% by weight, the flexibility of the carbon coated woven fabric may be deteriorated.

In the present invention, the base resin acts as an adhesive for coating the fiber with the carbon component and the additive, and is not limited to the type as long as it does not cause a secondary reaction with the fiber. Examples of the base resin include polyvinyl alcohol, polyurethane, polyethylene, ethylene vinyl acetate copolymer, polyvinyl chloride and silicone. These may be used alone or in combination of two or more.

The weight average molecular weight (Mw) of the base resin may be different from that of the base resin if necessary, and the weight average molecular weight of each resin may be the same depending on the purpose, even if the base resin includes two or more kinds of base resins.

In the present invention, the base resin may be contained in an amount of 40 to 70% by weight of the total treatment liquid composition. If the amount of the base resin is less than 40 wt%, the content of the base resin may be too small to properly coat the carbon component. If the amount of the base resin is more than 70 wt%, the fineness of the wool after coating may be affected, have.

The additive may be any one selected from among antioxidants, dispersants, surfactants, and inorganic particles. Examples of the additive include, but are not limited to, those which are conventionally used in the art and do not deteriorate conductivity .

In the present invention, the antioxidant may be used as both the primary and secondary antioxidants. Preferably, phenol type sulfur-containing phenol, bisphenol, polyphenol and aromatic amine type, phosphite type, sulfur ester type and the like can be used. It is more preferable to use dibutylhydroxy toluene, Tris (nonylphenyl) phosphite, or the like.

In the present invention, the dispersant is mainly represented by waxes and is not limited to any kind as long as it is generally used in the art for dispersing inorganic and organic particles. Examples of the dispersant include amide-based waxes and polyolefin-based waxes, and they may be used alone or in combination.

In the present invention, the surfactant is adsorbed on the interface in the coating composition to reduce the surface tension thereof. Particularly, interfacial adhesion between the inorganic particles such as silica and the like used as an absorbent filler is lowered to facilitate dispersion, And serves to increase the solubility of the additive dissolved in the composition. Examples of the surfactant include polyoxyethylene stearyl ester derivatives, sorbitan fatty acid ester derivatives, polyoxyethylene oleylamine derivatives and sodium stearate. These surfactants may be used singly or in combination of two or more. Do.

In the present invention, the inorganic particles may be added regardless of the type, as long as they are commonly used in the art, and the same or different materials as the inorganic conductive filler may be used.

In the present invention, the additive may include 15 to 30 wt% of the composition. When the additive includes two or more compositions, the total sum of the respective components should satisfy the above range, but the present invention is not limited thereto and can be freely adjusted within a range that can achieve the object of the present invention.

The present invention may further include a polyalkylene oxide in the additive to improve surface smoothness, maximize openness and frictional resistance of the carbon-coated fiber, and prevent carbon particles from desorbing.

In the present invention, the polyalkylene oxide may have a structure represented by the following formula (1).

[Chemical Formula 1]

Wherein R ₁ or R ₂ is hydrogen or a (C ₁ -C 30) alkyl group, (C 3 -C 10) cycloalkyl group, or (C 6 -C 10) aryl group;

R ₃ is ethylene oxide, propylene oxide or ethylene-propylene block;

and n is an integer of 1 to 100.)

In the present invention, each alkylene oxide group constituting the polyalkylene oxide chain may be represented by any one of -AO- and -OA- when the alkylene group is A. The alkylene group may be represented by ethylene, propylene, ethylene-propylene, etc., and the number of carbon atoms is preferably 2 to 6. Two or more of the above alkylene oxides may be used in combination.

It is more preferable that n is 1 to 100, preferably 2 to 35 as the number of repeating alkylene oxide groups.

In the present invention, the polyalkylene oxide may be added in an amount of 0.1 to 5% by weight in place of any one of the whole treatment liquids. If it is added in an amount of less than 0.1% by weight, the desired smoothness may not be expressed in the present invention, and when it is added in an amount exceeding 5% by weight, phase separation may occur between the additive and other compositions, and the coating layer itself can not be formed.

In the present invention, the carbon-coated wastes can be coated by dipping in the treatment liquid and drying. At this time, the dipping operation can be carried out more than once.

In the present invention, the weft yarns can be divided into carbon coated weft yarns (W1) and general weft yarns (W2), but the carbon coated weft yarns and general weft yarns are divided according to the presence or absence of the carbon component coating, It is not.

In the present invention, the carbon coated weft or general weft yarn is not limited to the fiber component, fineness and the like, and the carbon coated weft yarn and general weft yarn may have the same or different properties, and the present invention is not limited thereto.

In the present invention, the carbon coated weft yarns or general weft yarns are ordinary fibers used in the art for weaving, for example, synthetic resins such as ethylene, propylene, 1-butene, 1-hexene, (So-called LLDPE), high density polyethylene (so-called HDPE), polypropylene (propylene homopolymer), polypropylene random copolymer, and poly-1-butene which are the sole or copolymer of? (Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and the like) such as polyethylene terephthalate, poly (4-methyl-1-pentene), ethylene propylene random copolymer, ethylene butene random copolymer and propylene butene random copolymer, Polyamide (nylon-6, nylon-66, polymethylacrylamide, etc.), polyvinyl chloride, polyimide, ethylene-vinyl acetate It can be exemplified carbon monoxide copolymer, nitrile as polyacrylonitrile, polycarbonate, polystyrene, ionomer and a mixture thereof - body, an ethylene-vinyl acetate-vinyl alcohol copolymers, ethylene meth) acrylic acid copolymer, ethylene-acrylic acid ester. The above components may be used singly or in combination of two or more, and when two or more kinds of the components are used, the components may be simultaneously spun, or the spun fibers may be spun together, but the present invention is not limited thereto.

In the present invention, it is preferable that the carbon coated wool (W1) and the general weft yarn (W2) satisfy the following formula 1 to prevent the carbon coated wool (W1) from being damaged or cut off due to external friction,

[Formula 1]

_{0.2 ≤ d 1 / d 2 ≤} 0.8

(Where d ₁ is the denier of the carbon coated weft yarn W ₁ and d ₂ is the denier of the normal weft yarn W ₂ )

This is because when the fineness of the carbon coated weft yarn W1 is made smaller than the fineness of the general weft yarn, the carbon coated weft yarn is naturally wrapped in the general weft yarn during weaving, so that the exposure to the outside can be minimized, Can be protected from friction or the like.

In the present invention, when d ₁ / d ₂ of the formula 1 is less than 0.2, the fineness of the carbon coated weft yarn is too small and there is a risk of cutting during weaving. When d ₁ / d ₂ is more than 0.8, It is exposed to the outside together with the weft, so that it is difficult to avoid damage or trimming due to friction.

In the present invention, the warp yarn is not limited to the yarn used for weaving in the art, and may be the same as or different from the weft yarn. In the present invention, the fineness of the warp yarns may be 1 to 200 d (denier), but the present invention is not limited thereto.

The metal sheet may be used in a heat-generating sheet, and may be used without limitation as long as it can be woven. The metal yarn may include silver, gold, copper, aluminum, nickel, chromium, iron, manganese, titanium, zinc and tin as main components and the metal yarn may be used alone or as an alloy thereof.

In the present invention, the step a) may include weaving including a carbon weft yarn W1 in a weft direction and a general weft yarn, and a general warp yarn including a metal yarn in an oblique direction. Or after weaving the weft yarns and warp yarns, the yarns may be adhered or sewn in an oblique direction.

In this case, when the polar line is included in the oblique direction by the adhesion or the sewing, a step of covering the upper part with a separate fiber cloth or polymer film to induce the contact between the polar line and the carbon yarn may be additionally introduced .

In the present invention, the fabric is not limited to the weaving form. In addition to plain weaving, twill, junior, and unemployed may be applied depending on the purpose of use.

The fabric woven in accordance with the step a) is cut to a certain width so that the pole portions can be arranged at regular intervals at both ends. At this time, the cutting direction is a direction of warp and weft, and the sheet is cut to a size suited to the required shape to obtain a sheet-like sheet.

In the cut sheet, the power supply line can be connected to the polar line portion of the end portion of the fabric, where the metal yarn is located, as the polarity line. In order to more effectively control the temperature, the carbon-coated wafers are connected to a power supply line by soldering to a pole portion, and a temperature sensor, Temperature sensor Power supply line and temperature controller can be added to control the heat output temperature of the product.

After step (b), a cotton fabric is manufactured by connecting a polarizer and a temperature controller, and then the entire surface of the fabric is coated with an outer skin such as artificial leather or natural leather to be shielded from the outside to produce a heating sheet. The product manufactured in the above-described manner can be manufactured in the form of a piece, and can be applied to a surface product such as a car seat, a chair, a sofa, a blanket, a cushion or a long plate.

Next, a heat generating sheet manufacturing apparatus will be described in more detail with reference to the drawings. FIG. 1 schematically shows a preferred embodiment of a manufacturing apparatus capable of manufacturing a heat generating sheet according to the present invention. The manufacturing apparatus includes a woven section 100 provided in the middle in the middle, A warp feeder 200 including a plurality of rows of metal yarn bobbin 210 and a general warp bobbin 220 and a carbon fiber coated warp yarn bobbin 310 and a common weft yarn bobbin 320 And a weft supply unit 300.

 In the present invention, the warp supply unit 200 includes a metal yarn bobbin 210 which is provided as a plurality of bobbins in the rear lower portion of the weaving unit and supplies metal yarns, and a general warp bobbin 220 ).

Of course, the warp supply unit may be provided with only the warp supply unit as described above, and a method of attaching the metal yarn after weaving may be used.

The weft supply unit 300 may be composed of a carbon coated weft bobbin 310 and a general weft bobbin 320. Between the carbon coated weft bobbin 310 and the weaving unit, The guide 330 can be configured to smoothly supply the weft yarn drawn out from the weft yarn.

Referring to FIG. 2, the guide according to the present invention will be described in more detail with reference to the traveling direction of the weft. The guiding unit 331 receives the wefts from the bobbins and smoothly feeds them to the guide. A first guide hole 333 passing through the weft yarn passed through the first tension adjusting member and suppressing the vibration of the weft yarn, a weft yarn passing through the first guide hole 333, A second guide hole 335 for passing the weft passed through the second tension adjuster to the opening and for suppressing the vibration of the weft yarn, As shown in FIG.

In the present invention, the guiding portion 331 is disposed at the guide portion of the guide to allow the carbon-coated woven fabric 311 to pass through the guide, and may be provided in a funnel shape, but the present invention is not limited thereto.

In the present invention, the first and second tension adjusting parts 332 and 334 are made of two metal plates, and the weft can be grounded to the metal plate. This is to compensate for the lack of flexibility of the carbon-coated weft 311, which leads to poor fabricability, and it is possible to enhance the twisting and flexibility of the carbon-coated weft yarn at the same time by catching the weft by a metal plate.

In the present invention, the first and second guide holes 333 and 335 are formed in a small hole that allows the weft passing through the first or second tension adjusting unit to pass therethrough. By passing the weft yarn, It is possible to maintain the tension of the weft yarn while at the same time suppressing excessive vibration of the weft yarn which can be caused by the weft yarn, and at the same time to give the flexibility of the heating sheet to be woven.

In the present invention, the guide including the first and second tension adjusting parts may satisfy the following expression (2).

[Formula 2]

1.0 V ₁ ? V ₂ ? 1.1 V ₁

(Where V ₁ is the weft speed immediately after passing through the first tension adjuster, and V ₂ is the weft speed immediately after passing through the second tension adjuster).

Equation (2) is a physical property for enhancing the twist and flexibility of the carbon coated weft according to introduction of the guide, and it is possible to determine the passing speed of the weft by adjusting the weft grounding pressure of the metal plate provided in the tension adjusting unit.

In the present invention, when V ₂ is less than 1.0 V ₁ , the weft tension is too small to smoothly advance smoothly, and if V ₂ is greater than 1.1 V ₁ , the weft may be cut during the guide passage.

In the present invention, the weft yarn passed through the guide is transferred to the opening through the conveying device and used for the weaving process. The transport device is not limited to the type commonly used in the art. For example, a carrier, a gripper, a needle, an air jet, and a water jet may be used.

In the present invention, the weft yarn may be cut so that the post-weft yarns are positioned at the ends of the fabric. At this time, the weft yarn can be cut and clipped through the weft cut section, and if necessary, the weft cut section can be heated to further facilitate the cutting operation.

FIG. 3 shows a heating sheet which is woven in the form of a plain weave. The metal sheet 211 and the normal warp yarns 221 are inclined And the carbon coated weft 311 and the general weft yarn 321 are formed of weft yarns to form a fabric.

4 is a diagram illustrating a power supply connected to the heating sheet. The power supply unit 410 may supply power to the pole wire unit 420 through a power supply line 430, If it is, it is not limited to the kind.

5 is a cross-sectional view of a heat generating sheet woven in accordance with the present invention. The carbon coated weft 311 and the general weft yarn 321 are alternately supplied on the basis of a warp of a metal yarn or a general warp yarn, Lt; / RTI > Therefore, when the above formula (1) is satisfied, the warp is more wound on the surface of the general weft yarn, and the carbon coated weft yarn is not exposed to the fabric surface by the general weft yarn. The heat generating sheet manufactured according to the present invention has an advantage of minimizing the exposure of the carbon coated weft to the surface of the fabric, thereby suppressing damage or disconnection of the carbon coated weft caused by friction, thereby greatly increasing the life of the product.

Hereinafter, a method for producing a heat generating sheet according to the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

The physical properties of the specimens prepared through Examples and Comparative Examples were measured as follows.

(Heating property)

An FTO transparent conductive film of 500 nm was formed on a constant-voltage (AC, potentiostat) and K-type heat-resistant glass, an Ag electrode and an electrically insulating protective film were formed on the FTO transparent conductive film, The temperature was measured with a Field Emission Scanning Electron Microscope (FE-SEM).

(Example 1)

First, a treatment solution was prepared with the following composition to prepare a carbon coated weft. , 20 weight% of carbon black (KETJENBLACK-EC600DJ, Lion Akzo Co., Ltd.), 60 weight% of polyurethane (KPU-300, Kukdo Chemical), an antioxidant (dibutylhydroxytoluene) And 20% by weight of an additive in which a surfactant (sodium stearate) was mixed at a weight ratio of 1: 1: 1, respectively, were placed in a stirrer and mixed to prepare a treatment solution. Polyethylene terephthalate (PET, fineness: 30d) fibers were immersed in the resulting treatment liquid and dried to prepare carbon coated wefts.

Next, the weaving process was performed on the weaving machine after supplying the PET yarn with the fineness of 60 d and the carbon-coated weft with the general weft yarn and the warp, general warp (PET, fineness: 60 d) and metal yarn (copper, fineness: 60 d). The woven specimen was subjected to wear rotation according to the rotary platform of ASTM D3884 (Wear Resistance Test of Textiles), the wire was connected to the metal wire, and the temperature sensor and temperature controller were connected to complete the specimen. The current was applied to the finished specimen for 10 minutes and the exothermic characteristics were measured according to the voltage.

(Example 2)

A specimen was completed in the same manner as in Example 1 except that polyurethane was substituted for the treatment liquid and polyethylene oxide having a weight average molecular weight of 3,000 was further added in an amount of 3 weight%. A current was applied to the completed specimen and the heat generation characteristics were measured according to the voltage.

(Comparative Example 1)

A specimen was prepared in the same manner as in Example 1 except that PET fibers having a fineness of 60 d were used in the preparation of the carbon-coated weft. A current was applied to the completed specimen and the heat generation characteristics were measured according to the voltage.

[Table 1]

As shown in Table 1, the heat-generating sheet prepared according to the present invention exhibits a sufficient heat-generating temperature by suppressing short-circuiting of the carbon-coated woven fabric, even though the number of friction increases, as compared with the comparative example. In particular, in the case of Example 2 in which polyethylene oxide was further added to the treatment liquid, the flexibility of the carbon coated weft was further improved to improve the smoothness of the sheet, and it was found that the shorting of the carbon coated weft was further suppressed.

100: weaving part
200:
210: metal bobbin
211: metal sheet
220: General inclined bobbin
221: General slope
300: weft supplier
310: carbon coated woven bobbin
311: carbon coated weft
320: General weft bobbin
321: General weft
330: Guide
331:
332: First tension control unit
333: first guide hole
334: Second tension control unit
335: second guide hole
400: heating sheet
410:
420: pole portion
430: Power supply line

Claims (4)

a) fabricating a fabric by plain weaving a warp yarn comprising weft yarn comprising at least one carbon coated weft yarn (W1) and general weft yarn (W2) and at least one metal yarn;
b) connecting the power supply line to the pole wire portion by cutting the fabric and making the pole piece portion of the end of the fabric where the metal yarn is located; And
c) coating the entire surface woven fabric including the fabric and the power supply line with an outer covering and shielding the woven fabric from the outside;
Wherein the carbon coated weft yarn W1 and the general weft yarn W2 in the step a) satisfy the following formula 1,
Wherein the carbon coated weft (W1) and the general weft yarn (W2) are alternately supplied and weaving in plain weave.
[Formula 1]
_{0.2 ≤ d 1 / d 2 ≤} 0.8
(Where d ₁ is the denier of the carbon coated weft yarn W ₁ and d ₂ is the denier of the normal weft yarn W ₂ ) The method according to claim 1,
The carbon-coated woven fabric (W1) may contain at least one selected from the group consisting of carbon black, furnace black, graphene, carbon nanotubes and carbon precursors in an amount of 5 to 30% by weight, and polyvinyl alcohol, polyurethane, polyethylene, ethylene vinyl From 40 to 70% by weight of at least one base resin selected from the group consisting of an acetate copolymer, polyvinyl chloride and silicone, and (3) 15 to 30% by weight of at least one additive selected from antioxidants, dispersants, surfactants and inorganic particles Wherein the heat-generating sheet is coated with a liquid. The method according to claim 1,
Wherein the metal sheet has a fineness of 1 to 200 denier and is made of at least one selected from silver, gold, copper, aluminum, nickel, chromium, iron, manganese, titanium, zinc and tin. 3. The method of claim 2,
And 0.1 to 5% by weight of a polyalkylene oxide is further mixed in the treatment liquid.

Images