KR102263098B1 - Heating Assembly and Heater Comprising The Heating Assembly - Google Patents

Abstract

The heating assembly according to an embodiment of the present invention includes: a carbon nanotube layer disposed on the sheet, the carbon nanotube layer including a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred; and a pair of electrodes embedded in the carbon nanotube layer and spaced apart from each other; and a second heating element spaced apart from the electrode and extending in a meandering direction, the second heating element including a heating core generating heat by electrical resistance.

Description

Heating Assembly and Heater Comprising The Heating Assembly

The present invention relates to a heating assembly including carbon nanotubes and a heater including such a heating assembly, and more particularly, a linear heating element having a heating core in a heating element made of a carbon nanotube layer formed by impregnating carbon nanotubes in a binder. It relates to a hybrid type heating assembly to which a (line type heating element) is added 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 a heating element is widely used in various industrial fields for the purpose of applying heat, such as various electric and electronic industries, automobile transportation equipment industry, building construction industry, semiconductor industry, gas refining industry, and the like. According to the material, it is divided into metal resistors, non-metal resistors, and other resistors. Recently, due to new awareness of energy conservation and environmental problems, many studies have been conducted on the manufacture and application of eco-friendly and energy-efficient heating elements in many countries.

Conventionally, in order to realize a heating element having a planar shape in the shape of the final product, a heating core made of a linear resistor arranged in a meander is inserted into the fabric, and Velcro is attached to the fabric to the part that needs heat through the Velcro. Although a heating element was attached to heat or heat a part requiring heat, in this case, heat was concentrated in a local section in which a linear heating core was disposed, and consequently, there was a problem in that the actual plane heating could not be realized and the linear heating was implemented.

In addition, in the case of a heater having such a linear heating core, it is not easy to precisely control the resistance value of the linear heating core and to configure the resistor with a required resistance value.

In order to solve the above problems, an object of the present invention is to provide a heating assembly capable of generating heat by simultaneously providing a planar heating element including carbon nanotubes and a linear heating core for generating heat.

In addition, an object of the present invention is to provide a heating assembly capable of generating heat as the remaining heating element even when any one of the planar heating element or the linear heating element fails.

In addition, an object of the present invention is the extension direction of the rolling mark in which the carbon nanotubes dispersed in the compound are densely arranged in the process of rolling the carbon nanotube compound by the carenta method to form a sheet laminate (after the laminate structure is rolled) The unit area in the carbon nanotube compound by arranging a pair of electrodes in parallel to the direction perpendicular to the direction drawn out from the roller, and the direction in which the laminated structure is drawn out from the roller after rolling is referred to as the 'rolling direction') This is to improve the constantness of the phase resistance value.

In addition, an object of the present invention is to arrange the electrodes disposed on the sheet laminate perpendicular to the rolling direction, so that the carbon nanotubes are oriented in the rolling direction when the sheet laminate is drawn out from the roller, so the electrodes are disposed perpendicular to the rolling direction When the lower surface electrode is arranged parallel to the rolling direction, the contact amount between the carbon nanotube and the wiring is increased to improve electrical conductivity.

In addition, an object of the present invention is to provide a planar heating element that can freely control the resistance of the planar heating element by adjusting the thickness of the compound containing the carbon nanotubes stacked on the sheet laminate or by adjusting the distance between the electrodes arranged in parallel. It is to provide a heating assembly comprising.

Another object of the present invention is to provide a heating assembly capable of locally increasing heating performance by adjusting the arrangement position and arrangement density of a linear heating core in a planar heating element.

The heating assembly according to an embodiment of the present invention includes: a flexible sheet, a carbon nanotube layer disposed on the sheet, the carbon nanotube layer including a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred; and a pair of electrodes embedded in the carbon nanotube layer and spaced apart from each other; and a second heating element spaced apart from the electrode and extending in a meandering direction, the second heating element including a heating core generating heat by electrical resistance.

Here, the second heating element is embedded in the carbon nanotube layer of the first heating element.

In addition, the carbon nanotube layer includes a lower carbon nanotube layer disposed in contact with the upper side of the sheet, and an upper carbon nanotube layer disposed above the lower carbon nanotube layer, wherein the lower carbon nanotube layer A portion of the surface of the electrode is in contact with the lower carbon nanotube layer along the contact surface of the upper carbon nanotube layer with the upper carbon nanotube layer, and the remainder of the surface of the electrode is in contact with the upper carbon nanotube layer.

Meanwhile, a rolling mark formed during rolling is formed on the upper surface of the upper carbon nanotube layer, and the extending direction of the rolling mark formed perpendicular to the rolling direction is parallel to the extending direction of the electrode.

Here, the heating core of the second heating element includes a heating core in a linear extension section and a heating core in a curved extension section, wherein the linear extension section is formed in parallel to the extension direction of the rolling mark formed perpendicular to the rolling direction, or It may be formed perpendicular to the extension direction.

According to the heating assembly according to another embodiment of the present invention, the second heating element is disposed on the surface of the carbon nanotube layer of the first heating element.

Here, the heating assembly according to another embodiment of the present invention further includes a fixing knot for fixing the heating core of the second heating element to the surface of the carbon nanotube layer of the first heating element.

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

In the heating assembly according to another embodiment of the present invention, at least a portion of the carbon nanotube layer is disposed between the heating core and the sheet so that the heating core does not contact the sheet.

A heating assembly according to another embodiment of the present invention includes an adhesive line formed along a contact surface of the lower carbon nanotube layer and the upper carbon nanotube layer.

In the heating assembly according to another embodiment of the present invention, the fixing knot is formed through the first heating element.

In the heating assembly according to another embodiment of the present invention, both ends of the heating core protrude toward one of the side surfaces of the heating assembly.

In the heating heating element according to another embodiment of the present invention, both end portions of the heating core protrude from the side surface of the heating assembly with a portion of the electrode protruding therefrom.

In the heating assembly according to another embodiment of the present invention, the sheet may include polyolefin-based, polyester-based, polyethylene terephthalate (PET), polyimide (PI) or polytetrafluoroethylene (PTFE), polytetrafluoroethylene Films such as (PTFE) coated glass fiber, silicone coated glass fiber, and uncoated glass fiber include synthetic fibers.

A heating assembly according to another embodiment of the present invention further includes an electrically insulating layer surrounding the heating core.

As described above, according to the present invention, even if any one of the planar heating element or the linear heating element fails, it is possible to generate heat as the other heating element.

In addition, according to the present invention, in the process of rolling the carbon nanotube compound by the calendar method to form a sheet laminate, the carbon nanotubes dispersed in the compound are oriented in the rolling direction and perpendicular to the rolling direction of the manufactured sheet laminate. By disposing the pair of electrodes, the uniformity of the resistance value per unit area in the carbon nanotube compound is improved.

In addition, according to the present invention, the electrode disposed on the sheet laminate is disposed perpendicular to the rolling direction, so that the carbon nanotubes are oriented in the rolling direction when the sheet laminate is drawn out from the roller, so the electrode is disposed perpendicular to the rolling direction When the lower surface electrode is disposed parallel to the rolling direction, the amount of contact between the carbon nanotube and the electrode is increased, thereby improving electrical conductivity.

In addition, according to the present invention, it is possible to increase the heating performance of the heating assembly or to perform additional local heating.

1 is a flowchart of a method of manufacturing a heating assembly according to an embodiment of the present invention.
2 is a perspective view of a heating assembly manufactured by a method of manufacturing a heating assembly according to an embodiment of the present invention.
3 is a front view of the heating assembly of FIG. 2 ;
FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2 .
5 is a flowchart of a method of manufacturing a heating assembly according to another embodiment of the present invention.
6 is a perspective view of a heating assembly manufactured by the manufacturing method of FIG. 5 .
7 is a perspective view illustrating an embodiment of a heat generating assembly in which a linear heating element is embedded in a planar heating element and a linear heating element is added to an upper surface of the planar heating element.
8 is a cross-sectional view showing another embodiment of a method in which a linear heating element is embedded in a planar heating element.

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 those 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 defined by the claims. The terms used in this specification should be interpreted with 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 flowchart illustrating a method of manufacturing a heat generating assembly according to an embodiment of the present invention. Referring to FIG. 1 , the method for manufacturing a heat generating assembly according to an embodiment of the present invention comprises the steps of supplying and disposing a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred on a flexible sheet provided continuously (S1), and rolling the sheet laminate including the sheet and the carbon nanotube compound (S2).

Here, the sheet is a polyolefin-based, polyester-based, polyethylene terephthalate (PET), polyimide (PI), polytetrafluoroethylene (PTFE), polytetrafluoroethylene (PTFE) coated glass fiber, silicone material contains at least one of films such as coated glass fibers and uncoated glass fibers, and synthetic fibers.

In addition, the method for manufacturing a heating assembly according to an embodiment of the present invention comprises the steps of patterning and arranging an electrode and a coil, which is a linear heating core, on a rolled sheet laminate (S3), and then separately rolling on top of the sheet laminate It includes a step of providing an additional carbon nanotube compound (S4) and curing the laminated sheet laminate (S5). If necessary, the step of cutting the sheet laminate to a predetermined shape and size before the curing step may be performed.

Here, the carbon nanotube compound of the heat generating assembly according to the present invention is formed to include carbon nanotubes and a binder material, and in particular, is formed to include a silicone polymer as a binder. In addition, the heating element compound according to the present invention may be formed by including various glass polymer materials such as epoxy and urethane other than silicone polymer as a binder.

Carbon nanotubes are heat-generating materials having excellent mechanical strength and properties and thermal conductivity, and have a diameter of several nanometers to several tens of nanometers, and a length of several micrometers to several hundred micrometers. It is a material having an anisotropic structure. In carbon nanotubes, one carbon atom is bonded to three other carbon atoms, and a graphene sheet having 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 semiconducting properties with electrical resistance of 10 -4} to 10 ^-1 Ω, and a typical carbon material. It has a lower density than phosphorus graphite or carbon fiber. In addition, the length to diameter ratio (L/R) is high, so that when dispersed in the polymer resin, a small amount of addition is added to form a network structure with each other, so that it is easy to form an electrically conductive network, and thus excellent electrical conductivity can be obtained.

Here, when the content of carbon nanotubes in the carbon nanotube compound of the heating assembly including carbon nanotubes is less than a predetermined value, the electrical conductivity of the heating element is lowered and the resistance is increased, so the heating efficiency of the heating element is poor and the electromagnetic wave shielding agent , electromagnetic wave absorber, heat sink, soundproofing agent, negative electrode effect may be reduced. On the other hand, when the content of carbon nanotubes exceeds a predetermined value, dispersion in each polymer of ceramic, silicone, epoxy, and urethane is not effectively achieved, the viscosity increase of the final compound is very large, and the bonding force with the matrix polymer is lowered, There are disadvantages in that the mechanical strength is lowered and the durability is lowered, and the molding is not easy. Therefore, the carbon nanotube should be included in an optimal value in the carbon nanotube compound so that the heating assembly has sufficient electrical conductivity and thermal conductivity, and mechanical strength is not reduced along with excellent processability and formability.

On the other hand, carbon nanotubes are classified into single-walled carbon nanotubes and multi-walled carbon nanotubes according to the number of graphene sheets constituting the wall of the tube, and several carbon nanotubes may exist in the form of a bundle. Carbon nanotubes used in the present invention are single walled carbon nanotube (SWNT), double-walled carbon nanotube (DWNT), thin multi-walled carbon nanotube (thin multi-walled carbon nanotube) ), or at least one selected from multi-walled carbon nanotube (MWNT), preferably single-walled carbon nanotube.

In addition, with respect to the length of the carbon nanotube, if the length of the carbon nanotube is less than a predetermined value, durability is lowered and electrical conductivity is lowered, so that heat is not sufficiently generated, and the length of the carbon nanotube 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 nanotube included in the carbon nanotube compound should be selected as an optimal dimension in consideration of this point.

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

Meanwhile, FIG. 2 is a perspective view of the heating assembly manufactured and cut according to the manufacturing method of the embodiment of FIG. 1 , FIG. 3 is a front view of the heating assembly of FIG. 2 , and FIG. 4 is taken along line IV-IV of FIG. 2 . It is a cross section.

Referring to FIG. 2 , the heating assembly 100 according to an embodiment of the present invention includes a first heating element that generates and emits heat as a surface, and a second heating element that generates heat as a line. include Here, the first heating element is a flexible sheet 102, a carbon nanotube layer 104 including a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred, which is disposed on the sheet 102, and the carbon nanotubes. It is embedded in the tube layer and includes a pair of electrodes 120 spaced apart from each other. Meanwhile, the second heating element includes a heating core 130 disposed to be spaced apart from the electrode 120 and extending in a meandering manner to generate heat by electrical resistance.

Here, the second heating element is embedded in the carbon nanotube layer 104 of the first heating element.

As seen in the flowchart for the manufacturing method of FIG. 1 above, after the step (S1) of providing the lower carbon nanotube compound, the step (S3) of patterning the electrode and the heating coil to provide the upper carbon nanotube compound ( Since S4) is performed, the carbon nanotube layer 104 of FIG. 2 includes a lower carbon nanotube layer 104d disposed in contact with an upper side of the sheet, and an upper side disposed above the lower carbon nanotube layer. and a carbon nanotube layer 104u. Here, the step of providing the upper carbon nanotube compound (S4) may provide the upper carbon nanotube layer 104u to cover the entire lower carbon nanotube layer 104d (see FIGS. 2 to 4), The upper carbon nanotube layer 104u may be provided only partially on the surface of the lower carbon nanotube layer 104d where the electrode 120 is disposed (in the method in which the linear heating element is embedded in the planar heating element) 8 for a cross-sectional view showing another embodiment).

As a result, the heating assembly 100 includes an adhesive line formed along the contact surface of the lower carbon nanotube layer 104d and the upper carbon nanotube layer 104u.

Since the electrode 120 is buried in the carbon nanotube layer 104 of the first heating element, the electrode 120 is along the contact surface of the lower carbon nanotube layer 104d and the upper carbon nanotube layer 104u. ), a portion of the surface is in contact with the lower carbon nanotube layer 104d, and the remainder of the surface of the electrode is in contact with the upper carbon nanotube layer 104u.

Since the heating core 130 of the second heating element is also embedded in the carbon nanotube layer 104 of the first heating element, along the contact surface of the lower carbon nanotube layer 104d and the upper carbon nanotube layer 104u. A portion of the surface of the heating core 130 is in contact with the lower carbon nanotube layer 104d, and the rest of the surface of the heating core 130 is in contact with the upper carbon nanotube layer 104u.

In the heating assembly 100 , at least a portion of the carbon nanotube layer 104 is disposed between the heating core 130 and the sheet 102 so that the heating core 130 does not contact the sheet 102 . Similarly, at least a portion of the carbon nanotube layer 104 is disposed between the electrode 120 and the sheet 102 so that the electrode 120 does not directly contact the sheet 102 .

Meanwhile, during the rolling step S2 of FIG. 1 , a rolling mark 106 parallel to the axial direction of the roller is formed on a surface of the carbon nanotube compound that is pressed in contact with a roller (not shown). The rolling mark 106 is formed in a direction perpendicular to the direction in which the sheet laminate is taken out during the rolling process. The rolling mark 106 is formed on the upper surface of the upper carbon nanotube layer of the heating assembly 100 of FIG. 2 . In this case, the electrode is disposed so that the extending direction of the rolling mark 106 is parallel to the extending direction of the electrode 120 .

That is, a plurality of parallel rolling marks are disposed in the section of the carbon nanotube layer 104 disposed between the electrode 120 and the electrode 120 . In the direction parallel to the rolling mark, the density of the carbon nanotubes is uniform. Therefore, when the electrodes 120 are arranged in parallel with the rolling marks 106, the resistance of the carbon nanotube layer serving as a resistor in the section between the electrodes becomes constant.

Here, the heating core 130 of the second heating element includes a linear section heating core 130s and a curved section heating core 130c, wherein the straight section heating core 130s extends in the extending direction of the rolling mark 106 . It may be arranged parallel to or perpendicular to the extension direction of the rolling mark. Therefore, the direction of the uniformity of the resistance of the first heating element which becomes planar and generates heat does not conflict with the direction of the uniformity of the heat generation of the second heating element.

2 and 4 , in the heating assembly according to an embodiment of the present invention, both ends of the heating core 130 are exposed to the same one of the side surfaces of the heating assembly 100 and protrude.

On the other hand, in the heating assembly according to another embodiment of the present invention, the heating assembly 100 according to another embodiment of the present invention further includes an electrical insulation layer surrounding the heating core 130, the heating core ( When a current flows in 130 , an electrical interaction between the heating core 130 and the carbon nanotube layer 104 is prevented from occurring.

When the upper carbon nanotube compound is selectively disposed on a portion of the surface of the lower carbon nanotube compound on which the wires are disposed so that the upper carbon nanotube compound covers the wires, the electrical insulation layer 150 is applied only to the upper surface of the lower carbon nanotube compound. It can also be used (see FIG. 8).

Although not shown in the drawings, an insulating layer may be additionally provided on the upper surface of the heating assembly 100 . The insulation layer is a material of insulation properties including urethane rubber, silicone rubber, silicone foam, urethane foam, or inorganic insulation materials (eg, glass fiber, glass hollow body, mineral wool, ceramic wool), airgel, and aramid. include

5 is a flowchart of a method for manufacturing a heating assembly according to another embodiment of the present invention, and FIG. 6 shows a heating assembly manufactured by the manufacturing method of FIG. 5 .

Referring to FIG. 5 , the method for manufacturing a heat generating assembly according to another embodiment of the present invention includes the steps of supplying and disposing a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred on a flexible sheet provided continuously (S1'), and rolling the sheet laminate including the sheet and the carbon nanotube compound (S2').

In addition, the method for manufacturing a heating assembly according to another embodiment of the present invention shown in FIG. 5 includes the steps of patterning and arranging electrodes on the rolled sheet laminate (S3 ′), curing the laminated sheet laminate ( S3 ′) S4'). In addition, the method of manufacturing a heating assembly according to another embodiment of the present invention includes a step (S5 ′) of arranging and fixing a heating core, which is a heating coil, on the surface of the sheet laminate after the curing step.

Optionally, the step (S5') of disposing and fixing the heating core may be performed before the step of curing (S4').

Referring to FIG. 6 , the heating assembly 100 according to another embodiment of the present invention includes a first heating element generating heat by a surface and a second heating element generating heat by a wire. Here, the first heating element is a flexible sheet 102, a carbon nanotube layer 104 including a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred, which is disposed on the sheet 102, and the carbon nanotubes. It is embedded in the tube layer and includes a pair of electrodes 120 spaced apart from each other. In addition, the second heating element is disposed to be spaced apart from the electrode 120 and includes a heating core 130 extending in a meandering direction to generate heat through electrical resistance.

As shown in FIG. 6 , the heating core 130 of the second heating element is exposed on the upper surface of the carbon nanotube layer 104 of the first heating element.

In addition, the heating assembly further includes a fixing knot 140 for fixing the heating core 130 of the second heating element to the surface of the carbon nanotube layer 104 of the first heating element.

The fixing knot 140 penetrates the carbon nanotube layer 104 and the sheet 102 of the first heating element to fix the heating core 130 to the surface of the carbon nanotube layer.

Meanwhile, during the rolling step (S2') of FIG. 5 , a rolling mark 106 parallel to the axial direction of the roller is formed on the surface of the carbon nanotube compound that is pressed in contact with the roller (not shown). . The rolling mark 106 is formed on the upper surface of the carbon nanotube layer 104 of the heating assembly 100 of FIG. 6 . In this case, the electrode is disposed so that the extending direction of the rolling mark 106 is parallel to the extending direction of the electrode 120 .

Here, the heating core 130 of the second heating element includes a linear section heating core 130s and a curved section heating core 130c, wherein the straight section heating core 130s extends in the extending direction of the rolling mark 106 . It may be arranged parallel to the , or may be arranged perpendicular to the extension direction of the rolling mark.

The heating assembly 100 further includes an electrical insulation layer surrounding the heating core 130 , so that when an electric current flows through the heating core 130 , electrical interconnection between the heating core 130 and the carbon nanotube layer 104 . prevent the action from happening.

Although not shown in the drawings, an insulator layer made of the above-mentioned material may be additionally provided on the upper surface of the heating assembly 100 .

The heater according to an embodiment of the present invention is formed to include the heating assembly of the above-described embodiment and a flexible cover (not shown) surrounding the heating assembly. The heater includes a fixing means such as Velcro for easily attaching the heating assembly to a portion requiring heat.

Again, although not shown in the drawings, the first heating element and the second heating element may be controlled by operation control systems separate from each other. If any one of the first heating element and the second heating element fails, the control system performs heating with only the other heating element.

7 is a perspective view illustrating an embodiment of a heat generating assembly in which a linear heating element is embedded in a planar heating element and a linear heating element is added to an upper surface of the planar heating element.

Referring to FIG. 7 , the second heating element including the linear heating core 130B is embedded in the carbon nanotube layer 104 of the first heating element, which is a planar heating element, while at the same time an additional linear heating core 130A. The second heating element including is fixed and disposed on the upper surface of the carbon nanotube layer 104, which is the first heating element, which is a planar heating element.

Although specific embodiments have been described in detail in the present invention, this invention is not limited thereto, and this invention is capable of various modifications by those skilled in the art to which the invention pertains, and these modifications are within the scope of the invention. are included in

With respect to interpretation, it can be understood that this invention can be implemented in modified forms without departing from the essential characteristics of the invention.

The disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of this invention is indicated in the claims rather than the above description, and differences within the equivalent scope should be construed as being included in the invention.

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

102: sheet 104: carbon nanotube layer
104d: lower carbon nanotube layer 104u: upper carbon nanotube layer
106: rolling mark 120: electrode
130: heating core 130s: straight section heating core
130c: curved section heating core 140: fixed knot

Claims (7)

flexible sheet,
a carbon nanotube layer disposed on the sheet, the carbon nanotube layer including a carbon nanotube compound in which a mixture of carbon nanotubes and a binder is stirred; and
A first heating element including a pair of electrodes embedded in the carbon nanotube layer and spaced apart from each other;
A second heating element spaced apart from the electrode and extending in a meandering direction, the second heating element including a heating core generating heat by electrical resistance,
A rolling mark formed during rolling is formed on the upper surface of the carbon nanotube layer, and the extending direction of the rolling mark formed perpendicular to the rolling direction is parallel to the extending direction of the electrode,
The second heating element is a heating assembly, characterized in that the contact with the carbon nanotube layer. The method of claim 1,
and the second heating element is embedded in the carbon nanotube layer of the first heating element. 3. The method of claim 2,
The carbon nanotube layer,
a lower carbon nanotube layer disposed in contact with the upper side of the sheet;
Including an upper carbon nanotube layer disposed on the upper side of the lower carbon nanotube layer,
A portion of the surface of the electrode along the contact surface of the lower carbon nanotube layer and the upper carbon nanotube layer is in contact with the lower carbon nanotube layer, and the rest of the surface of the electrode is in contact with the upper carbon nanotube layer. A heating assembly characterized in that. delete The method of claim 1,
The second heating element is a heating assembly, characterized in that disposed on the surface of the carbon nanotube layer of the first heating element. 6. The method of claim 5,
The heating assembly further comprising a fixing knot for fixing the heating core of the second heating element to the surface of the carbon nanotube layer of the first heating element. A heater comprising the heating assembly according to claim 1 and a flexible cover portion surrounding the heating assembly.

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