KR102226912B1 - Method For Manufacturing Flat Type Heating Element, Flat type Heating Element Manufactured By The Method, Heater Comprising The Flat Type Heating Element - Google Patents

Abstract

According to an embodiment of the present invention, a method for manufacturing a planar heating element includes the steps of: supplying and disposing a carbon nanotube compound in which a mixture of an electrode including an electrically conductive electrode, a carbon nanotube, and a binder is stirred on a continuously provided flexible sheet; rolling a sheet laminate including the sheet, the electrode, and the carbon nanotube compound; and curing the rolled sheet laminate.

Description

Method for manufacturing a planar heating element, a planar heating element manufactured thereby, a heater including a planar heating element {Method For Manufacturing Flat Type Heating Element, Flat type Heating Element Manufactured By The Method, Heater Comprising The Flat Type Heating Element}

The present invention relates to a method of manufacturing a planar heating element containing carbon nanotubes, a planar heating element manufactured by the manufacturing method, and a heater including such a planar heating element, and in more detail, a continuous calendar is impregnated with carbon nanotubes in a binder. It relates to a method of manufacturing a planar heating element forming a planar heating element by a rolling operation, a planar heating element manufactured thereby, and a heater including the same.

In general, a heating element is an object that transfers energy by converting electrical energy into thermal energy and radiating the heat to the outside. Such heating elements are widely used in various industrial fields for applying heat, such as various electric and electronic industries, automobile transport equipment industries, building construction industries, semiconductor industries, and gas refinery industries. Depending on the material, it is divided into metal resistors, non-metal resistors, and other resistors. In recent years, due to a new awareness of energy saving and environmental issues, many studies have been conducted on the manufacturing and application fields of eco-friendly and energy-efficient heating elements in many countries.

However, a heating element using a metal resistor, which is a typical prior art, has advantages of excellent thermal stability and oxidation resistance with little deformation at high temperature, but heats up when a high voltage is applied, so a magnetic field generated when a current flows may be harmful to the human body. In addition, the manufacturing process of the heating element using the metal resistor is complicated, and thus productivity is greatly reduced. The heating element using such a metal resistor generally not only uses a high voltage AC power, but also has a very large temperature difference between the section in which the metal resistor is installed and the section where the metal resistor is not installed, so more energy consumption is required to achieve thermal equilibrium. There is a safety risk problem in itself at the installed site. In particular, the conventional resistor made by adding additives other than barium and titanium to ceramic, which is one of the other resistors, has a disadvantage in that the magnetic field generated when an electric current flows is harmful to the human body and high power consumption.

On the other hand, although the graphite heating element has various excellent advantages, a molding environment under high pressure or high temperature conditions is required during the solidification process, so special equipment and production technology are required. Due to this, economic feasibility is low, and there is a limit on the size of the solidified heating element. In order to produce a desired shape, it must be processed using a machine tool, so secondary processing and accompanying costs are required.

In addition, the graphite powder has a problem in that the fine powder is buried on the surface even after it is formed, and when the heating characteristic of 100° C. or higher is driven, the heating temperature of the heating element is not kept constant and there is an unstable problem.

Conventionally, in order to implement the heating element in the shape of the final product, a linear resistor arranged in a meandering direction is inserted into the fabric, and a Velcro is attached to the fabric, and the heating element is attached to the part where heat is required through the Velcro. Although the part requiring heat generation was heated or heated, in this case, there was a problem in that the resistor was easily disconnected due to repeated bending. In addition, there is a scattering problem in that the elastic material surrounding the resistor loses its intrinsic mechanical properties and becomes powdered while thermal aging due to long-term heat exposure. In addition, in the process of sewing resistors arranged in a meander with fabric material, the volume of the product was increased, so there was a limit to realizing a product of a small shape. There was also a problem of increasing.

In order to solve this problem, a structure of a planar heating element in which a layer including carbon nanotubes is stacked in a mold having a predetermined shape and electrodes are formed therein has been proposed. However, since the shape of the planar heating element is limited to the shape of the individual mold, there is a problem in that a new mold must be prepared every time a planar heating element of a new standard is to be formed. There is a limit on the size and thickness of the product of the planar heating element, and since the production is performed in a discontinuous manner, there is a limit to enlargement of the planar heating element and mass production thereof.

In order to solve the above problems, an object of the present invention is to provide an improved method for manufacturing a planar heating element including carbon nanotubes and a planar heating element manufactured thereby.

In addition, an object of the present invention is the rolling direction of the carbon nanotubes dispersed inside the compound in the process of rolling the carbon nanotube compound into a sheet stack by the calendar method (referring to the direction in which the sheet stack is drawn out from the roller, hereinafter referred to as'rolling (Referred to as'direction'), and by arranging a pair of electrodes parallel to the extending direction of the rolling mark perpendicular to the rolling direction of the manufactured sheet stack, the uniformity of the resistance value per unit area in the carbon nanotube compound can be improved. To be able to.

In addition, an object of the present invention is to arrange the electrodes disposed on the sheet stack in parallel with the extending direction of the rolling mark perpendicular to the rolling direction, so that when the sheet stack is pulled out from the roller, the carbon nanotubes are oriented in the rolling direction. When the electrodes are arranged perpendicular to the rolling direction, the contact amount between the carbon nanotubes and the wiring is increased compared to when the electrodes are arranged parallel to the rolling direction, thereby improving electrical conductivity.

In addition, an object of the present invention is to provide a planar heating element capable of freely controlling the resistance of the planar heating element by adjusting the thickness of a compound containing carbon nanotubes stacked on a sheet stack or by adjusting the distance between electrodes arranged in parallel. It is to do.

In addition, an object of the present invention is to prevent the flatness of the sheet laminate from deteriorating due to the difference in the thermal expansion coefficient between the elements of each layer of the sheet laminate in the process of heating and curing the sheet laminate containing the carbon nanotube compound. will be.

A method of manufacturing a planar heating element according to an embodiment of the present invention includes an electrode portion including an electrically conductive electrode and a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred on a continuously provided flexible sheet. Providing; Rolling a sheet stack including the sheet, the electrode part, and the carbon nanotube compound; And curing the rolled sheet laminate.

Here, in the rolling of the sheet stack, a rolling mark is formed on the upper surface of the carbon nanotube compound parallel to the axial direction of the roller.

In addition, the electrodes of the electrode portion are disposed parallel to the extending direction of the rolling mark perpendicular to the rolling direction.

The method of manufacturing a planar heating element according to an embodiment of the present invention further includes the step of cutting the sheet stack into a predetermined size and shape.

The sheet stack cut in this cutting step is cut so that at least two electrodes are included in the stack.

The cutting step includes cutting the electrode along a vertical line passing through the electrode along the length direction of the electrode of the electrode part.

The method of manufacturing a planar heating element according to an embodiment of the present invention further includes applying an insulator to the surface of the electrode, which is cut in the cutting step and partially exposed.

In the step of providing an electrode portion including an electrically conductive electrode on a continuously provided flexible sheet and a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred, the electrode portion comprises the carbon nanotube compound on the sheet. It is supplied and disposed upstream of the point that provides it.

In the method of manufacturing a planar heating element according to an embodiment of the present invention, prior to the step of curing the sheet laminate, the rolled sheet laminate is in a direction in which the plane of the sheet laminate is curved by heating in the curing step. It further comprises the step of pre-curving the sheet stack in the opposite direction.

Another feature of the present invention relates to a planar heating element manufactured by the method of manufacturing the planar heating element described above.

Here, the sheet includes polyimide (PI), polytetrafluoroethylene (PTFE), coated fiberglass, or silicon coated fiberglass.

Another feature of the present invention relates to a heater including the above-described planar heating element and a flexible cover part surrounding the planar heating element.

As described above, according to the present invention, it is possible to continuously mass-produce a planar heating element including carbon nanotubes.

In addition, according to the present invention, while rolling the carbon nanotube compound, a rolling mark is formed on the upper surface of the carbon nanotube compound layer perpendicular to the rolling direction, but in the final planar heating element, the carbon nanotubes are densely arranged. It is possible to improve the uniformity of the resistance value per unit area in the carbon nanotube compound by arranging it parallel to the direction of the rolling mark.

In addition, according to the present invention, it is possible to prevent the flatness of the sheet laminate from deteriorating due to the difference in the coefficient of thermal expansion between the elements of each layer of the sheet laminate in the process of heating and curing the sheet laminate containing the carbon nanotube compound. There will be.

In addition, according to the present invention, since it is easy to use the planar heating element by successively extending or cutting it, the shape variability is high, and the thickness of the carbon nanotube compound layer and the distance of the electrode can be freely designed, making it easy to control the resistance value.

In addition, according to the present invention, since the planar heating element itself has sufficient flexibility, it is possible to actively cope with the shape of the attachment object to be kept warm or heated.

1 is a flow chart for a method of manufacturing a planar heating element according to an embodiment of the present invention.
2 is a side explanatory view of a part of an apparatus for manufacturing a planar heating element according to an embodiment of the present invention.
Fig. 3 is a partial perspective view of the device of Fig. 2;
4 is a view showing a state in which the sheet laminate is cut in the manufacturing method of FIG. 1.
5 is a side cross-sectional view of an individual planar heating element cut along the line AA of FIG. 4.
6 is an explanatory diagram illustrating a step of bending a sheet laminate that may be performed before the curing step in the manufacturing method of FIG. 1.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following description and accompanying drawings are for understanding the operation according to the present invention, and parts that can be easily implemented by a person skilled in the art may be omitted.

In addition, the specification and drawings are not provided for the purpose of limiting the present invention, and the scope of the present invention should be determined by the claims. Terms used in the present specification should be interpreted as meanings and concepts consistent with the technical idea of the present invention so that the present invention can be most appropriately expressed.

1 is a flow chart showing a method of manufacturing a planar heating element according to an embodiment of the present invention. Referring to FIG. 1, in a method of manufacturing a planar heating element according to an embodiment of the present invention, an electrode portion including an electrically conductive electrode and a mixture of carbon nanotubes and a binder are stirred on a continuously provided flexible sheet. Supplying and disposing a carbon nanotube compound (S1), and rolling a sheet stack including the sheet, the electrode part, and the carbon nanotube compound (S2).

In addition, a method of manufacturing a planar heating element according to an embodiment of the present invention includes a step (S3) of curing the rolled sheet laminate. In the method of manufacturing a planar heating element according to another embodiment of the present invention, the step of cutting the sheet stack (S4) is not necessarily limited to that performed after the step of curing (S3), and cutting the sheet stack Step (S4) may be performed before the curing step (S3).

In addition, the method of manufacturing a planar heating element according to an embodiment of the present invention further includes a step (S5) of applying an insulator to the surface of the electrode that is cut in the cutting step (S4) and a part of the surface is exposed. It can be, and it includes a step (S6) of subsequently assembling the necessary insulating layer or cover layer by casing.

Here, the carbon nanotube compound of the planar heating element according to the present invention is formed by including a carbon nanotube and a binder material, and in particular, is formed by including a silicone polymer as a binder.

In addition, the heating element compound according to the present invention may be formed by including various organic polymer materials such as epoxy and urethane other than silicone polymer as a binder.

Carbon nanotubes are a heating material having excellent mechanical strength, properties, and thermal conductivity, and have a diameter of several nanometers to tens of nanometers, and a length of several micrometers to hundreds of micrometers, and have an anisotropic structure.

In carbon nanotubes, one carbon atom is bonded to three other carbon atoms, and a graphene sheet forming a hexagonal honeycomb structure is wound in a tube shape.

According to these structural characteristics, carbon nanotubes are mechanically robust (about 100 times that of iron), have excellent chemical stability, ^{and have semiconductor characteristics with electrical resistance of 10 -4} to 10 ^-1 Ω, and are generally carbon materials. It has a lower density than phosphorus graphite or carbon fiber.

In addition, since the length-to-diameter ratio (L/R) is high, when dispersed in a polymer resin, a network structure is formed by adding a small amount to each other, so that an electrical conductive network can be easily formed, thereby obtaining excellent electrical conductivity.

Here, if the content of carbon nanotubes in the carbon nanotube compound of the planar heating element including carbon nanotubes is contained below a predetermined value, the electric conductivity of the heating element is lowered and the resistance increases, so the heating efficiency of the heating element is poor and the electromagnetic wave shielding agent , Electromagnetic wave absorber, heat sink, sound insulation, negative electrode effect may be inferior.

On the other hand, if the content of carbon nanotubes exceeds a predetermined value, dispersion cannot be effectively performed in each polymer of ceramic, silicone, epoxy, and urethane. There are disadvantages in that the mechanical strength is lowered, resulting in poor durability and difficulty in molding.

Therefore, the carbon nanotubes should be included in an optimal value in the carbon nanotube compound so that the planar heating element has sufficient electrical conductivity and thermal conductivity, and mechanical strength with excellent processability and formability is not lowered.

Meanwhile, carbon nanotubes are classified into single-walled carbon nanotubes and multi-walled carbon nanotubes according to the number of graphene sheets forming the wall of the tube, and several carbon nanotubes may exist in the form of a bundle. The carbon nanotubes used in the present invention are single walled carbon nanotubes (SWNT), double-walled carbon nanotubes (DWNT), and thin multi-walled carbon nanotubes. ), or multi-walled carbon nanotubes (MWNT), and preferably, single-walled carbon nanotubes may be used.

In addition, in relation to the length of the carbon nanotubes, if the length of the carbon nanotubes is less than a predetermined value, there is a problem that durability decreases and electrical conductivity is low, so that heat is not sufficiently generated, and the length of the carbon nanotubes is a predetermined value. If it exceeds, there is a problem that the surface of the heating element becomes uneven. Therefore, the length of the carbon nanotubes included in the carbon nanotube compound should be selected with the optimum dimension in consideration of these points.

In the present invention, a detailed description for manufacturing the carbon nanotube compound is omitted and may be manufactured by a conventional carbon nanotube compound manufacturing method. In general, the carbon nanotube compound includes a mixture in which a carbon nanotube and a binder material are mixed with each other in a predetermined ratio.

At this time, the carbon nanotubes may be prepared in a powder form and dispersed in a binder material. First, in order to manufacture a heating element, the carbon nanotubes may be heat treated before the carbon nanotubes and the binder material are mixed. In addition, the carbon nanotubes may be further subjected to a separate dispersion process before being dispersed in the binder material. That is, carbon nanotubes are carbon nanotubes dispersed through a carbon nanotube dispersion process and are evenly dispersed in a binder material.

On the other hand, FIG. 2 is a step of supplying and disposing an electrode part including an electrically conductive electrode and a carbon nanotube compound on the sheet of FIG. 1 (S1), and rolling in a state in which the electrode part and carbon nanotubes are disposed on the sheet. As a diagram specifically explaining the step (S2), it is a side explanatory view of a part of an apparatus used in a method of manufacturing a planar heating element according to an embodiment of the present invention. Fig. 3 is a partial perspective view of the device of Fig. 2;

2 and 3, the sheet winding body 102s is a component in which the sheet 102 having flexibility is wound, and the sheet winding body 102s is unwinded so that the upper roller ( 120u) and a lower roller (120d) to the roller assembly including the sheet 102 is continuously supplied. The sheet 102 continuously supplied from the sheet winding body 102s is supplied toward a roller assembly including the upper roller 120u and the lower roller 120d disposed oppositely at a predetermined surface interval. Although not shown in the drawings, the roller assembly includes a frame for supporting the upper roller 120u and the lower roller 120d at a predetermined position.

Although not shown in the drawing, at least one guide roller arranged in various sizes is disposed on the path through which the sheet 102 is supplied to the roller assembly, so that the supply path of the sheet and the supply inclination angle of the sheet can be adjusted.

Before the sheet 102 enters the space between the upper roller 120u and the lower roller 120d of the roller assembly, an electrode part including an electrically conductive electrode 103 on the sheet is an electrode part supply part 103r. And the carbon nanotube compound 104 is supplied by a compound feeder (feeder: 140n).

The electrode unit supply unit 103r is connected to an electrode unit storage unit 103s that stores and supplies the electrode unit. The electrode supply unit 103r may be a robot arm that supplies the electrode unit stored in the electrode unit storage unit 103s in a pick-and-drop format. Optionally, the electrode supply unit 103r may be a device in which the electrode unit continuously supplied from the electrode unit storage unit 103s is pushed out and discharged.

The electrode unit may include one or more individual electrically conductive electrodes 103, but may have a circuit board shape in which a plurality of electrodes 103 are formed as one layer to each other in order to make the supply gap between the electrodes 103 constant. . In this case, the electrode 103 itself is a single electrical conductor, and the electrode portion may include a spacer (not shown) to maintain a gap between the individual electrode 103 and the electrode 103.

The compound feeder 140n is fluidly connected to the compound supply unit 104s for supplying the carbon nanotube compound by a compound conduit 104c. Accordingly, the carbon nanotube compound 104 is continuously supplied onto the sheet 102 through the compound supply unit 104s, the compound conduit 104c, and the compound feeder 104n.

In the step of providing a carbon nanotube compound 104 in which a mixture of a mixture of carbon nanotubes and a binder is stirred and an electrode portion including an electrically conductive electrode 103 on a continuously provided flexible sheet 102, the electrode The electrode portion including 103 is supplied and disposed upstream of the point where the carbon nanotube compound is provided on the sheet.

Accordingly, the electrode portion including the electrode 103 is first disposed on the sheet 102, and the carbon nanotube compound 104 is stacked and disposed on the sheet on which the electrode portion is disposed.

The electrode part supply part 103r supplies and arranges an electrode part including an electrically conductive electrode 103 on the sheet 102, and the compound feeder 104n forms a carbon nanotube compound on the sheet 102. When supplying 104, in order that the electrode portion including the electrode 103 and the carbon nanotube compound 104 are seated at a predetermined position on the sheet 102, the sheet 102 is provided with a predetermined guide roller ( (Not shown), while being continuously supplied in a state maintained horizontally, the electrode portion and the carbon nanotube compound are supplied to the upper portion thereof.

After the electrode portion including the electrode 103 and the carbon nanotube compound 104 are disposed on the sheet 102, the sheet 102, the electrode portion including the electrode 103, and the carbon nanotube compound The sheet stack body 110 (shown in FIG. 4) in which 104 is stacked is rolled through the space between the upper roller 120u and the lower roller 120d.

By adjusting the gap between the surface of the upper roller 120u and the surface of the lower roller 120d, it is possible to control the rolling pressure applied to the rolled sheet stack 110. By adjusting the rolling pressure, the density between particles of the carbon nanotube compound 104 rolled on the sheet 102 may be controlled.

Referring to FIG. 3, the carbon nanotube compound 104 disposed on the sheet 102 in the process of rolling the sheet stack 110 through the gap between the upper roller 120u and the lower roller 120d. ) Is spread evenly on the upper surface of the sheet 102 and rolling marks 106 are formed on the upper surface of the carbon nanotube compound 104 due to the rolling pressure.

The rolling marks 106 are formed to extend parallel to the axial direction of the upper roller 120u and the lower roller 120d arranged side by side at intervals. The rolling mark 106 is a texture formed on the upper surface of the carbon nanotube compound 104 during a rolling process.

Although not shown in the drawing, when the carbon nanotube compound 104 is rolled on the sheet 102, the carbon nanotube compound 104 is spread over any one of the two sides of the sheet 102 and applied. To prevent, a predetermined step portion may be formed on both ends of the upper roller 120u and the lower roller 120d in the axial direction.

Optionally, when the carbon nanotube compound 104 is rolled on the sheet 102, in order to prevent the carbon nanotube compound 104 from spreading and being applied beyond any one of both sides of the sheet 102 , Although not shown in the drawing, a protruding guide portion may be provided on both sides of the sheet 102 to guide the compression flow of the carbon nanotube compound.

FIG. 4 shows a sheet stack 110 obtained by cutting the sheet stack formed through the continuous rolling process shown in FIG. 3 into a predetermined shape and size. On the upper surface of the sheet stack 110, a plurality of rolling marks 106 formed during the rolling process are formed in one direction (in the y-axis direction in FIG. 4 ).

The electrodes 103 of the electrode portion are disposed parallel to the rolling mark 106. In addition, at least two electrodes are disposed on the sheet stack 110 cut into a predetermined size and shape.

Accordingly, when a current flows through the electrode 103, the carbon nanotube compound 104 disposed between the electrode and the electrode generates heat as a resistor.

One end of the sheet stack 110 cut in FIG. 4 was cut along the line B-B. That is, the line B-B indicates the cross section of the electrode 103 and the carbon nanotube compound 104 and the sheet 102 between the electrode 103 and the electrode.

If necessary, in the cutting step (S4), the electrode 103 may be cut in a vertical direction passing through the electrode 103 along the length direction of the electrode 103. In this case, when the sheet stack 110 is cut in the vertical direction passing through the electrode 103, the electrodes 103 cut in the cutting process each serve as an electrode in each separate sheet stack 110. Will perform.

As described above, the cutting step (S4) may be performed after the curing step (S3), or may be performed before the curing step (S3).

As shown in FIG. 4, when one electrode 103 of the electrode part is cut along the AA line, and the other electrode 103 adjacent to the electrode part is also cut to vertically divide the electrode, the electrode included in the cut planar heating element One surface of 103 is not surrounded by a carbon nanotube compound layer and is exposed to the atmosphere.

In this case, when current flows through the electrode, there is a possibility that the user using the planar heating element may be electrocuted or the current may leak to the device in which the planar heating element is installed. The method further includes applying an insulator to the surface of the exposed electrode (step S5 in FIG. 1).

5 is a side cross-sectional view of the planar heating element in a state in which an insulator is applied to the exposed electrode when the planar heating element is cut in a direction perpendicular to the electrode as shown in line A-A of FIG. 4.

Referring to FIG. 5, in FIG. 4, an electrode 103 partially cut and cut off is disposed on the sheet 102 along the AA line of a specific electrode and the vertical line of the adjacent electrode, and the upper side of the electrode and the sheet 102 ) On the upper side of the carbon nanotube compound 104 is disposed in a rolled state. An insulator layer 107 is disposed on the side of the electrode 103 disposed on each side of the planar heating element to prevent the electrode 103 from being directly exposed to the outside. The insulator layer 107 may be a material having fluidity or an insulating tape having electrical conductivity.

The curing step may be performed after the insulator layer 107 is disposed, or the step of disposing the insulating layer may be performed after the curing step.

On the other hand, in the curing step (S3: FIG. 1) of the method of manufacturing a planar heating element according to the present invention, the electrode 130 and the carbon nanotube compound 104 are disposed on the sheet 102, the sheet stacking The sieve 110 is hardened by a method of heating.

Such curing includes heating the sheet stack 110 in which the electrode 130 and the carbon nanotube compound 104 are disposed on the sheet 102 by baking in an oven or a conveyor type heat treatment furnace. .

On the other hand, in the assembling step (S8) of the method of manufacturing the planar heating element according to the present invention, a separate insulation layer 105 may be additionally disposed on the top of the resulting sheet stack 110. In addition, in the assembling step (S8), the heater may be completed by assembling the flexible cover part to the planar heating element.

Optionally, a curing step may be performed after the heat insulator layer 105 is disposed on the sheet stack 110.

6 is an explanatory view of a step of bending the sheet laminate before the step of curing performed in the manufacturing method of FIG. 1. Referring to FIG. 6, in a method of manufacturing a planar heating element according to an additional embodiment of the present invention, the sheet stack 110 in which the electrode 103 and the carbon nanotube compound 104 are rolled on a sheet 102. ) Before the curing step, the sheet stack 110 is in a direction opposite to the direction in which the plane of the sheet stack 110 is curved by thermal expansion by heating in the curing step (A direction: FIG. 6). It may further include the step of curving the sheet stack 110 in advance.

By bending the sheet stack 110 in the A direction before the curing step, curing the sheet stack 110 in the curing step due to the difference in the expansion rate between the elements of each layer of the sheet stack is complemented and cured. After passing through the step, finally, the sheet stack 110 may have a flat surface (a surface extending in the direction B).

6 shows a configuration in which the sheet stack 110 is bent in advance without the insulator layer 107 or the insulator layer provided, but the sheet is stacked with the insulator layer 107 or the insulator layer provided. It is also possible to pre-curve the sieve and perform a curing step.

The sheet 102 of the planar heating element manufactured by the method of manufacturing a planar heating element of the present invention includes polyimide (PI), polytetrafluoroethylene (PTFE), coated fiberglass, or silicon coated fiberglass. It is formed of a material.

In addition, the insulation layer (not shown) is made of urethane rubber, silicone rubber, silicone foam, urethane foam, or inorganic insulation material (eg, glass fiber, glass hollow body, mineral wool, cerac wool), aerogel, aramid. It may contain a material of insulating properties including.

A heater according to an embodiment of the present invention is formed to include the above-described planar heating element and a flexible cover portion (not shown) surrounding the planar heating element.

This is a detailed description of specific embodiments in the invention, but this invention is not limited thereto, and this invention is capable of various modifications by those of ordinary skill in the art to which the present invention belongs, and these modifications are the scope of the invention. Included in

With regard to interpretation, it can be understood that this invention may be embodied in a modified form without departing from the essential characteristics of the invention.

The disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the invention is shown in the claims rather than the above description, and differences within the scope equivalent thereto should be construed as being included in the invention.

In the case of terms whose meaning is not particularly defined in the present invention, it should be broadly interpreted as a general meaning, and should be interpreted as including other terms in an equal range.

102: sheet 102s: sheet winding
104: carbon nanotube compound 106: rolling mark
110: sheet laminate
120u: upper roller 120d: lower roller
130: electrode

Claims (12)

As a method of manufacturing a planar heating element, the method,
An electrode portion including an electrically conductive electrode on a continuously provided flexible sheet, and a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred so as to cover the sheet and the electrode portion is placed on the sheet and the sheet. Providing on the electrode portion;
Rolling a sheet laminate comprising the sheet, the electrode part, and the carbon nanotube compound; And
Including; curing the rolled sheet laminate,
In the rolling of the sheet stack, a rolling mark is formed on the upper surface of the carbon nanotube compound parallel to the axial direction of the roller,
The method of manufacturing a planar heating element, wherein the electrode of the electrode portion is disposed to extend parallel to the extending direction of the rolling mark formed perpendicular to the rolling direction. delete delete The method of claim 1,
Method for manufacturing a planar heating element, characterized in that it further comprises the step of cutting the sheet laminate to a predetermined size and shape. The method of claim 4,
The cutting step is a method of manufacturing a planar heating element, characterized in that cutting so that at least two electrodes are included in the cut sheet stack. The method of claim 4,
The cutting step is a method of manufacturing a planar heating element, characterized in that cutting the electrode in a vertical direction passing through the electrode along the length direction of the electrode. The method of claim 6,
The method of manufacturing a planar heating element, characterized in that it further comprises the step of applying an insulator to the surface of the electrode, which is cut in the cutting step to expose a portion of the surface. The method of claim 1,
In the step of providing an electrode portion including an electrically conductive electrode on a continuously provided flexible sheet and a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred, the electrode portion comprises the carbon nanotube compound on the sheet. A method of manufacturing a planar heating element, characterized in that it is supplied and disposed upstream than the point to provide a. The method of claim 4,
Prior to the step of curing the sheet laminate,
In the step of curing the rolled sheet laminate, manufacturing a planar heating element further comprising the step of bending the sheet laminate in advance in a direction opposite to a direction in which the plane of the sheet laminate is curved by heating. Way. The planar heating element manufactured by the manufacturing method of any one of claims 1 and 4 to 9. The planar heating element according to claim 10, wherein the sheet comprises at least one of polyimide (PI), polytetrafluoroethylene (PTFE), coated fiberglass, or silicone coated fiberglass. A heater comprising the planar heating element of claim 10 and a flexible cover part surrounding the planar heating element.

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