Planar heat generator, clothes management machine including same, hot and cold water purifier, and floor heating panel for building

Abstract

The planar heating element according to the present invention comprises a matrix formed of a molding base resin and a conductive material, into which a pair of wires are inserted. Heating occurs through resistance within the matrix when power is applied, resulting in a simple structure that is easy to manufacture. Sufficient heating effect can be achieved regardless of thermal conductivity. Furthermore, the planar heating element is divided into heating and non-heating sections, which are integrally manufactured using a dual injection molding method. This allows for the manufacture of planar heating elements of various shapes with a simple manufacturing process, thus offering advantages such as reduced manufacturing costs and time.

Description

Technical Field

[0001] This invention relates to a planar heating element and hot and cold water purifiers, underfloor heating panels for buildings, and garment management machines using the same. More specifically, it relates to a planar heating element manufactured by inserting a pair of wires into a conductive composite material containing a base resin and a conductive resin, thereby simplifying the manufacturing process and enabling it to generate heat when powered, as well as garment management machines, hot and cold water purifiers, and underfloor heating panels for buildings including the same. Background Technology

[0002] The most commonly used electric heaters are typically sheath heaters, which are tubular heaters in which heating wires are coiled and encased in a metal protective tube. Magnesium oxide, used as insulating powder, is added to insulate the heating wires from the protective tube. These sheath heaters are robust even under external physical impact, have high electrothermal efficiency, and can be appropriately shaped to suit various user applications and configurations.

[0003] With the increasing use of electric heaters in various products, there is growing interest in more compact and easier-to-manufacture planar heating elements.

[0004] Because existing planar heating elements are made by stacking multiple sheets or coating heating layers on sheets, they suffer from complex manufacturing processes and long manufacturing times. Summary of the Invention

[0005] Technical issues

[0006] The purpose of this invention is to provide a planar heating element that is simple to manufacture and can be produced in various shapes, as well as clothing management machines, hot and cold water purifiers, and underfloor heating panels for buildings that include the heating element.

[0007] Technical solution

[0008] The planar heating element according to the present invention comprises: a heating section wherein a pair of wires are inserted at predetermined intervals into the interior of a matrix formed of a conductive composite material of a base resin and a conductive material, wherein applying a power source causes the wires to have a potential difference, resulting in resistance heating occurring within the matrix; the conductive material comprises: carbon components dispersed within the base resin to form an electrical network; and metal powder, which is interposed between the carbon components to increase the electrical network formed by the carbon components and to transfer the resistance heat generated by the carbon components to the surface of the heating section by increasing the thermal conductivity of the conductive composite material; the base resin content in the conductive composite material is 60 to 72 wt%, and the carbon component content in the conductive composite material is 10 wt% or more and 17 wt% or less to form the electrical network; the diameter of the metal powder in the conductive composite material is 10 nm to 100 nm, and the metal powder content is 12 wt% or more to increase the electrical network between the carbon components and to increase the thermal conductivity of the conductive composite material, and 22 wt% or less to reduce the specific gravity of the conductive composite material; the specific gravity of the conductive composite material (according to ASTM) is... The test results (d792) showed a resistivity of 0.8 to 1.3 and a resistivity of 2 to 10 Ω / mm². 2 / m, thermal conductivity is 156 to 235 kcal / mh℃.

[0009] The tensile strength of the conductive composite material (tested according to ASTM D638) is 180 to 200 kgf / cm². 2 .

[0010] The carbon component comprises carbon nanotubes and graphene, wherein the mixing ratio of graphene and carbon nanotubes is 1w%:10w.

[0011] The carbon component includes at least one of carbon fiber and carbon nanotube, and the length of the carbon component is 1 to 100 μm.

[0012] The metal powder includes aluminum powder.

[0013] The base resin includes: non-conductive resins including acrylonitrile-butadiene-styrene (ABS), silicone, polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), and polydimethylsiloxane (PDMS), and conductive resins including polypyrrole (PPy), wherein the content of the conductive resin in the base resin is greater than 0 and less than 10 wt%.

[0014] The conductive composite material further includes a stabilizer and a binder, wherein the stabilizer content is 0.1–0.6 wt% and the binder content is 0.4–2.1 wt%.

[0015] The wire includes at least one of aluminum wire, copper alloy wire, copper wire, and conductive composite material wire.

[0016] It also includes a non-heating part, which is separated from the heating part and formed as a whole, and is formed of a material with lower conductivity than the conductive composite material.

[0017] The wire insert is injection molded onto the substrate, and the heating part and the non-heating part are double injection molded.

[0018] The garment management machine utilizing a planar heating element according to the present invention includes an ironing plate for pressing garments to remove wrinkles or forming a straightening emboss on trousers. The ironing plate is a planar heating element comprising a heating section in which a pair of wires are inserted at predetermined intervals into a matrix formed of a conductive composite material composed of a base resin and a conductive material. When a power source is applied such that the wires have a potential difference, resistance heating occurs within the matrix. The conductive material comprises: carbon components dispersed within the base resin to form an electrical network; and metal powder, which is interposed between the carbon components to enhance the electrical network formed by the carbon components and to improve the thermal conductivity of the conductive composite material. The resistive heat generated by the carbon components will be transferred to the surface of the heating element. The content of the base resin in the conductive composite material is 60 to 72 wt%. The content of the carbon components in the conductive composite material is 10 wt% or more and 17 wt% or less to form the electrical network. The diameter of the metal powder in the conductive composite material is 10 nm to 100 nm. The content of the metal powder is 12 wt% or more to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and 22 wt% or less to reduce the specific gravity of the conductive composite material. The specific gravity of the conductive composite material (tested according to ASTM D792) is 0.8 to 1.3, and the resistivity is 2 to 10 Ωmm. 2 / m, thermal conductivity is 156 to 235 kcal / mh℃.

[0019] The hot and cold water purifier utilizing a planar heating element according to the present invention includes a planar heating element disposed in contact with at least one side of a hot water tank containing hot water. The planar heating element includes: a heating section wherein a pair of wires are inserted at predetermined intervals into the interior of a matrix formed of a conductive composite material of a base resin and a conductive material. When a power source is applied such that the wires have a potential difference, resistance heating occurs within the matrix. The conductive material includes: carbon components dispersed within the base resin to form an electrical network; and metal powder intermediate between the carbon components to increase the electrical network formed by the carbon components and to enhance the thermal conductivity of the conductive composite material. The resistive heat generated by the carbon components is transferred to the surface of the heating element. The base resin content in the conductive composite material is 60 to 72 wt%. The carbon component content in the conductive composite material is 10 wt% or more and 17 wt% or less to form the electrical network. The diameter of the metal powder in the conductive composite material is 10 nm to 100 nm. The metal powder content is 12 wt% or more to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and 22 wt% or less to reduce the specific gravity of the conductive composite material. The specific gravity of the conductive composite material (tested according to ASTM D792) is 0.8 to 1.3, and the resistivity is 2 to 10 Ωmm. 2 / m, thermal conductivity is 156 to 235 kcal / mh℃.

[0020] The floor heating panel of a building utilizing a planar heating element according to the present invention includes a planar heating element disposed on the floor heating panel of a building. The planar heating element includes: a heating section wherein a pair of wires are inserted at predetermined intervals into the interior of a matrix formed of a conductive composite material composed of a stamped base resin and a conductive material. When a power source is applied such that the wires have a potential difference, resistance heating occurs within the matrix. The conductive material includes: carbon components dispersed within the base resin to form an electrical network; and metal powder, which is interposed between the carbon components to increase the electrical network formed by the carbon components and to enhance the thermal conductivity of the conductive composite material. The resistive heat generated by the carbon components is transferred to the surface of the heating element. The base resin content in the conductive composite material is 60 to 72 wt%. The carbon component content in the conductive composite material is 10 wt% or more and 17 wt% or less to form the electrical network. The diameter of the metal powder in the conductive composite material is 10 nm to 100 nm. The metal powder content is 12 wt% or more to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and 22 wt% or less to reduce the specific gravity of the conductive composite material. The specific gravity of the conductive composite material (tested according to ASTM D792) is 0.8 to 1.3, and the resistivity is 2 to 10 Ωmm. 2 / m, thermal conductivity is 156 to 235 kcal / mh℃.

[0021] According to another aspect of the present invention, a planar heating element comprises a matrix formed by stamping a composite material of a mixture of a non-conductive resin and a conductive material, and at least a pair of wires inserted into the interior of the matrix at predetermined intervals to be integrally formed with the matrix during the stamping process, wherein resistance heating occurs within the matrix when a power source is applied such that the wires have a potential difference.

[0022] According to another aspect of the present invention, a hot and cold water purifier utilizing a planar heating element is provided, the planar heating element being configured to contact at least one side of a hot water tank containing hot water, comprising a matrix formed by stamping a composite material of a mixture of non-conductive resin and conductive material, and at least a pair of wires inserted into the interior of the matrix at predetermined intervals to be integrally formed with the matrix during the stamping process, wherein resistance heating occurs within the matrix when a power source is applied such that the wires have a potential difference.

[0023] According to another aspect of the present invention, a floor heating panel for a building utilizing a planar heating element is provided on the floor heating panel of the building, the planar heating element comprising a matrix formed by stamping a composite material of a mixture of a non-conductive resin and a conductive material, and at least a pair of wires inserted into the interior of the matrix at predetermined intervals to be integrally formed with the matrix during the stamping process, wherein resistance heating occurs within the matrix when a power source is applied such that the wires have a potential difference.

[0024] According to another aspect of the present invention, a garment management machine utilizing a planar heating element is disposed on an ironing plate for pressing garments to remove wrinkles or forming a straightening emboss on trousers. The planar heating element comprises a substrate formed of a composite material of a mixture of non-conductive resin and conductive material by stamping, and at least a pair of wires inserted into the interior of the substrate at predetermined intervals to be integrally formed with the substrate during stamping. When a power source is applied such that the wires have a potential difference, resistance heating occurs within the substrate.

[0025] According to another aspect of the present invention, a planar heating element includes a heating part and a non-heating part, wherein a pair of wires are inserted at a predetermined interval into the interior of a substrate formed of a first material, and when a power source is applied such that the wires have a potential difference, heat is generated through resistance generated inside the substrate, wherein the non-heating part is separated from the heating part and is integrally formed of a second material having a lower conductivity than the first material.

[0026] According to another aspect of the invention, a garment management machine including a planar heating element includes an ironing plate for pressing garments to remove wrinkles or to form a straightening emboss on trousers. The ironing plate is divided into a heating section and a non-heating section. In the heating section, a pair of wires are inserted at predetermined intervals into the interior of a substrate formed of a first material. When a power source is applied such that the wires have a potential difference, heat is generated through resistance occurring inside the substrate. The non-heating section is separated from the heating section and is integrally formed of a second material with a lower conductivity than the first material.

[0027] According to another aspect of the present invention, a hot and cold water purifier including a planar heating element includes a planar heating element disposed in contact with at least one side of a hot water tank containing hot water. The planar heating element is divided into a heating part and a non-heating part. In the heating part, a pair of wires are inserted into the interior of a substrate formed of a first material at predetermined intervals. When a power source is applied so that the wires have a potential difference, heat is generated through resistance generated inside the substrate. The non-heating part is separated from the heating part and is integrally formed of a second material with a lower conductivity than the first material.

[0028] According to another aspect of the present invention, a floor heating panel for a building including a planar heating element includes a planar heating element disposed on the floor heating panel of the building, the planar heating element being divided into a heating part and a non-heating part, wherein in the heating part a pair of wires are inserted into the interior of a substrate formed of a first material at predetermined intervals, and when a power source is applied such that the wires have a potential difference, heat is generated through resistance generated inside the substrate, the non-heating part being separated from the heating part and integrally formed of a second material having a lower conductivity than the first material.

[0029] Technical effect

[0030] The planar heating element according to the present invention is configured such that a pair of wires are inserted inside a matrix formed of a molding base resin and a conductive material. Heat is generated by resistance occurring inside the matrix when a power source is applied. Therefore, the structure is simple and easy to manufacture, and sufficient heating effect can be obtained regardless of the thermal conductivity.

[0031] Furthermore, the area of ​​the planar heating element is divided into a heating part and a non-heating part. The heating part and the non-heating part are manufactured in one piece by a dual injection molding method, which enables the manufacture of planar heating elements of various shapes and the manufacturing process is simple. Therefore, it has the advantages of saving manufacturing costs and manufacturing time.

[0032] Furthermore, the conductive material comprises carbon components and metal powder. The content of the carbon components in the conductive composite material is 10 to 17 wt%, the content of the metal powder is 12 to 22 wt%, and the content of the base resin is 60 to 72 wt%. Therefore, it has the advantage that an electrical network can be easily formed through the carbon components, and the resistance heat generated by the carbon components can be easily transferred to the surface of the heating part through the metal powder. Attached Figure Description

[0033] Figure 1 This is a schematic diagram illustrating an example of a planar heating element according to a first embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram briefly illustrating a stamping method for a planar heating element according to a first embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram illustrating an example of a hot and cold water purifier utilizing a planar heating element according to a second embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram illustrating an example of a floor heating panel for a building utilizing a planar heating element according to a third embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram illustrating an example of a clothing management machine utilizing a planar heating element according to a fourth embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram briefly illustrating a dual injection molding method for a planar heating element according to a fifth embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram briefly illustrating a planar heating element according to a sixth embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram illustrating an example of a clothing management machine utilizing a planar heating element according to a seventh embodiment of the present invention;

[0041] Figure 9 It is shown Figure 8 A schematic diagram of an ironing board is shown.

[0042] Figure 10 This is a schematic diagram illustrating an example of a hot and cold water purifier utilizing a planar heating element according to an eighth embodiment of the present invention;

[0043] Figure 11 This is a schematic diagram illustrating an example of a floor heating panel for a building utilizing a planar heating element according to a ninth embodiment of the present invention. Detailed Implementation

[0044] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0045] Figure 1 This is a schematic diagram illustrating an example of a planar heating element according to a first embodiment of the present invention.

[0046] See Figure 1 According to the first embodiment of the present invention, the planar heating element 10 includes a heating part that heats up through the surface when a power source is applied, and is configured as a thin sheet or film.

[0047] The heating element is formed by inserting a pair of wires 12 into the interior of a matrix 11, which is a conductive composite material made of a mixture of base resin 11a and conductive material 11b. When power is applied, the conductive material forms an electrical network and generates heat.

[0048] The conductive composite material includes the conductive material 11b, the base resin 11a, a stabilizer, and other additives.

[0049] The conductive material 11b includes carbon components and metal powder.

[0050] The carbon component includes at least one of carbon fiber, carbon nanotubes, and graphene. The carbon component is dispersed within the base resin to form an electrical network. The content of the carbon component in the conductive composite material is 10 wt% or more and less than 17 wt% to form the electrical network. In this embodiment, the carbon component is illustrated by using a mixture of carbon nanotubes (CNTs) and graphene. The length of the carbon nanotubes is 1 to 100 μm. Preferably, the mixing ratio of graphene and carbon nanotubes is 1 wt%:20 wt%.

[0051] The metal powder, placed between the carbon components, increases the electrical network formed by the carbon components and improves the thermal conductivity of the conductive composite material, thereby transferring the resistance heat generated by the carbon components to the surface of the heating element. Without the metal powder, the resistance heat generated by the carbon components cannot be transferred to the surface of the heating element due to the extremely low thermal conductivity of the non-conductive resin; therefore, the thermal conductivity of the conductive composite material decreases to a level close to that of the non-conductive resin.

[0052] Therefore, the diameter of the metal powder in the conductive composite material is 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. In this embodiment, aluminum powder is used as an example of the metal powder. However, the invention is not limited to this; the conductive material may also contain nanomaterials.

[0053] The base resin 11a includes: non-conductive resins including acrylonitrile-butadiene-styrene (ABS), silicone, polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), and polydimethylsiloxane (PDMS), and conductive resins including polypyrrole (PPy).

[0054] In this embodiment, polypropylene (PP) is used as the non-conductive resin and polypyrrole (PPy) is used as the conductive resin. The content of PPy in the base resin can be used in the range of 0 to 10 wt%. In this embodiment, a mixing ratio of 5 wt% to 95 wt% of PP and PPy is used as an example. Adding PPy to the base resin 11a can improve the electrical properties of the conductive composite material. However, it is not limited to this; the base resin 11a can also be composed solely of the non-conductive resin.

[0055] In addition, the wires 12 are inserted into the interior of the base 11 at predetermined intervals, and are formed integrally with the base during stamping.

[0056] The system comprises at least one pair of wires 12. In this embodiment, an example is provided where a pair of wires 12 are arranged inside the base 11. The wires 12 extend along their length. Various modifications can be made to the length and insertion position of the wires 12.

[0057] The wire 12 is made of at least one of aluminum wire, copper alloy wire, copper wire, and conductive composite material wire. The conductive composite material wire includes carbon wire. In this embodiment, copper wire is used as an example for illustration. However, it is not limited to this, and various types can be used as long as a power supply is available. The wire 12 can be connected to a power supply device (not shown) located outside the planar heating element 10 to obtain a power supply.

[0058] Furthermore, the planar heating element 10 may be connected to or have a control unit (not shown) for supplying or cutting off power and controlling temperature.

[0059] The manufacturing method of the planar heating element according to the first embodiment of the present invention, as described above, will be described below.

[0060] First, the carbon component, the aluminum powder, the base resin, the stabilizer, and the adhesive are mixed in a preset ratio.

[0061] The carbon component content is set to be in the range of 10 to 17 wt% of the total content of the conductive composite material. The carbon component content is a parameter affecting the conductivity, i.e., resistivity, of the conductive composite material. When the carbon component content is below 10 wt%, the electrical network structure of the carbon component is poor, thus reducing conductivity. If the conductivity is too low, no current flows, and therefore no resistive heat is generated. Furthermore, when the carbon component content exceeds 17 wt%, the conductivity no longer increases; therefore, it is used at 17 wt% or less to save costs. That is, in this invention, to achieve an appropriate range of conductivity in the conductive composite material, it is preferable that the carbon component content is within the range of 10 to 17 wt%. More preferably, the carbon component content is mixed to be 12 to 15 wt%.

[0062] In this embodiment, the carbon component is illustrated using carbon nanotubes and graphene as an example. In particular, it is preferred that the mixing ratio of graphene and carbon nanotubes is 1 wt%:10 wt%.

[0063] Furthermore, the content of the aluminum powder is set to within the range of 12 to 22 wt% of the total content of the conductive composite material. The content of the aluminum powder is a parameter affecting the electrical conductivity and thermal conductivity of the conductive composite material. When the content of the aluminum powder is less than 12 wt%, it not only fails to act as an electrical network between the carbon nanotubes, but also fails to adequately perform the thermal conduction function of transferring the resistance heat generated by the carbon components to the surface of the heating element. In addition, when the content of the aluminum powder exceeds 22 wt%, there is a problem of increased specific gravity of the conductive composite material. Therefore, it is preferable that the content of the aluminum powder is within the range of 12 to 22 wt%. In particular, it is more preferable that the content of the aluminum powder is mixed to be 15 to 20 wt%. By adding the aluminum powder, costs are saved compared to using only the carbon components, and the electrical conductivity and thermal conductivity can be further improved.

[0064] Furthermore, the content of the base resin in the conductive composite material is 60 to 72 wt%, the content of the stabilizer is 0.1 to 0.6 wt%, and the content of the binder is 0.4 to 2.1 wt%.

[0065] Furthermore, the example given is that the base resin is formed by adding PPy to PP. More preferably, the content of PPy in the base resin is 0 to 10 wt%. In particular, more preferably, the content of PPy is 5 wt%.

[0066] The conductive composite material, mixed in the optimized proportions as described above, is fed into the pre-fabricated lower mold 22.

[0067] The composite material is fed into the lower mold 22, and the pair of wires 12 are inserted at a predetermined position. The pair of wires 12 are configured to be spaced apart from each other by a predetermined interval.

[0068] In this embodiment, the conductive composite material is first placed into the lower mold 22 and then the wire 12 is inserted as an example. However, this is not the only possibility; the wire 12 can be placed first and then the conductive composite material can be placed. Furthermore, if the conductive composite material is placed first, it can also be placed further after the wire 12 is inserted.

[0069] Subsequently, under high temperature and pressure using the upper mold 21, the planar heating element 10, in which the wire 12 is integrally formed on the substrate 11, is formed.

[0070] Therefore, the planar heating element 10 with the wire 12 can be formed by a single stamping process, so the manufacturing method is very simple and can save manufacturing time and cost.

[0071] Furthermore, the planar heating element 10 can be manufactured in various shapes, thus making it suitable for a wider range of products.

[0072] The test results of the conductive composite material manufactured by the above method are as follows.

[0073] The specific gravity of the conductive composite material (tested according to ASTM D792) is 0.8 to 1.3. The resistivity of the conductive composite material is 2 to 10 Ω / mm². 2 / m. The carbon nanotubes and aluminum powder are mixed in an optimized ratio to produce a conductive composite material with optimized resistivity, thereby achieving appropriate electrical and thermal conductivity.

[0074] The thermal conductivity of the conductive composite material is 156 to 235 kcal / mh℃. This thermal conductivity varies depending on the aluminum powder content; in this embodiment, the aluminum powder content is set to a range of 12 to 22 wt%, thus ensuring the conductive composite material falls within this thermal conductivity range. Therefore, by mixing in the aluminum powder, the thermal conductivity of the conductive composite material can be improved, effectively transferring the resistance heat generated by the carbon component to the surface of the heating element.

[0075] The tensile strength (tested according to ASTM D638) of the conductive composite material is 180 to 200 kgf / cm². 2The tensile elongation (tested according to ASTM D638) is 22 to 27 wt%, and the flexural modulus (tested according to ASTM D790) is 1200 to 1300 kgf / cm². 2 The flexural strength (tested according to ASTM D790) is 200 to 220 kgf / cm². 2 .

[0076] The operation of the planar heating element according to the first embodiment of the present invention, as described above, will be explained below.

[0077] When a power source is applied to the pair of wires 12 to create a potential difference, the conductive material forms an electrical network inside the substrate 11, generating heat through resistance occurring inside.

[0078] Therefore, the entire surface of the planar heating element 10 can be heated.

[0079] The planar heating element according to the first embodiment of the present invention, as described above, is manufactured by integrally incorporating the wires 12 within the substrate 11 formed of a conductive composite material. This results in a simple structure and an extremely simple manufacturing method, saving manufacturing time and costs. In other words, compared to manufacturing by separately connecting wires or stacking multiple sheets and terminals, the number of steps is reduced, and manufacturing is easier.

[0080] Furthermore, since a pair of wires 12 are configured to have a potential difference when powered, and resistance heating occurs within the substrate 11, it has the advantage of achieving sufficient heating regardless of the thermal conductivity of the substrate 11 or the wires 12. That is, when a heating terminal is inserted inside the substrate, both the heating terminal and the substrate must have high thermal conductivity to achieve sufficient heating. However, in this invention, instead of inserting heating terminals, wires are inserted inside the substrate to conduct electricity, thereby generating heat within the substrate. Therefore, sufficient heating can be achieved regardless of the thermal conductivity.

[0081] in addition, Figure 3 This is a schematic diagram illustrating an example of a hot and cold water purifier utilizing a planar heating element according to a second embodiment of the present invention.

[0082] See Figure 3According to the second embodiment of the present invention, the hot and cold water purifier 200 utilizing the planar heating element 210 includes a body 201 and a hot water tank 202 disposed inside the body 201 and containing hot water. Except for the fact that the planar heating element 210 is arranged to contact at least one side of the hot water tank 202, which is different from the first embodiment, the other components and functions are similar. Therefore, the details will be described with the differences as the focus.

[0083] The following description uses an example where the planar heating element 210 is configured to surround the outer surface of the hot water tank 202. However, it is not limited to this; the planar heating element 210 can be applied to any surface, such as the bottom surface of the hot water tank 202, that can transfer heat to the hot water tank 202.

[0084] The planar heating element 210 is formed in the form of a thin sheet or film, and is made of a soft material, so it is easy to integrate into the hot water tank 202.

[0085] The structure and manufacturing method of the planar heating element 210 are the same as those in the first embodiment.

[0086] in addition, Figure 4 This is a schematic diagram illustrating an example of a floor heating panel for a building utilizing a planar heating element according to a third embodiment of the present invention.

[0087] See Figure 4 According to the third embodiment of the present invention, the floor heating panel 300 of a building using a planar heating element 310 is a panel installed on the floor of a building for floor heating. Except for the fact that the planar heating element 310 is installed on the floor heating panel 300, which is different from the first embodiment, the other components and functions are similar. Therefore, the details will be described with the differences as the focus.

[0088] The planar heating element 310 can be disposed inside or on the floor heating panel 300.

[0089] The planar heating element 310 is configured as a thin sheet or film, and at least one of them can be disposed on the floor heating panel 300.

[0090] The structure and manufacturing method of the planar heating element 310 are the same as those in the first embodiment.

[0091] in addition, Figure 5 This is a schematic diagram illustrating an example of a clothing management machine utilizing a planar heating element according to a fourth embodiment of the present invention.

[0092] See Figure 5According to the fourth embodiment of the present invention, the garment management machine 400 utilizing the planar heating element 410 includes a body 420, a door 430, and an ironing plate 440 disposed on the door 430 for applying pressure to garments to remove wrinkles or to form a straight embossing for trousers. Except for the fact that the planar heating element 410 is disposed on the ironing plate 440, which is different from the first embodiment, the rest of the structure and function are similar. Therefore, the details will be described with the differences as the focus.

[0093] The main body 420 forms a space for storing clothing and is open at the front.

[0094] The door 430 is formed to open and close the front of the body 420.

[0095] The inner side of the door 430 has a clamping part 431, a support plate 432, a pressure plate 433 and an iron plate 440.

[0096] The clamp 431 is located on the upper inner side of the door 430 and is formed as a clamping member capable of gripping the end of the pants P.

[0097] The support plate 432 is fixedly installed on the inner side of the door 430 and is configured to face the trousers P hanging on the clamp 431. The support plate 432 provides support when the ironing plate 440 and the pressure plate 433 apply pressure to the trousers P.

[0098] The pressure plate 433 is rotatably coupled to the support plate 432 and is used to apply pressure to the iron plate 440 in the direction toward the support plate 432.

[0099] The iron plate 440 is disposed between the pressure plate 433 and the support plate 432, and is configured to rotate from the support plate 432.

[0100] The planar heating element 410 can be attached to the inside of the ironing plate 440 or to the side facing the pants P. The planar heating element 410 is configured as a thin sheet or plate, and at least one may be present.

[0101] The structure and manufacturing method of the planar heating element 410 are the same as those in the first embodiment.

[0102] Not limited to the embodiments described, the planar heating element can also be applied to a barbecue grill.

[0103] in addition, Figure 6 This is a schematic diagram briefly illustrating a dual injection molding method for a planar heating element according to a fifth embodiment of the present invention.

[0104] See Figure 6According to the fifth embodiment of the present invention, the planar heating element 510 is formed by dividing a heating portion 501 that heats up through the surface when a power source is applied and a non-heating portion 502 that does not heat up when the power source is applied. That is, the heating portion 501 and the non-heating portion 502 in the planar heating element 510 are formed as one unit, and the heating portion 501 is divided into a heating area and the non-heating portion 502 is a non-heating area.

[0105] The heating part 501 is integrally formed with the non-heating part 502, but is made of a different material than the non-heating part 502, and therefore has a different conductivity than the non-heating part 502.

[0106] The heating element 501 is formed by inserting a pair of wires 12 inside a matrix 11 made of a conductive composite material composed of a base resin 11a and a conductive material 11b. When a power source is applied, the conductive material forms an electrical network and generates heat.

[0107] The conductive composite material includes the conductive material 11b, the base resin 11a, a stabilizer, and other additives.

[0108] The conductive material 11b includes carbon components and metal powder.

[0109] The carbon component includes at least one of carbon fiber, carbon nanotubes, and graphene. The carbon component is dispersed within the base resin to form an electrical network. The content of the carbon component in the conductive composite material is between 10 wt% and 17 wt% to form the electrical network. In this embodiment, the carbon component is described as a mixture of carbon nanotubes (CNTs) and graphene. The length of the carbon nanotubes is 1 to 100 μm. Preferably, the mixing ratio of graphene and carbon nanotubes is 1 wt%:20 wt%.

[0110] The metal powder, placed between the carbon components, increases the electrical network formed by the carbon components and improves the thermal conductivity of the conductive composite material, transferring the resistance heat generated by the carbon components to the surface of the heating element. Without the metal powder, the resistance heat generated by the carbon components cannot be transferred to the surface of the heating element due to the extremely low thermal conductivity of the non-conductive resin; therefore, the thermal conductivity of the conductive composite material is reduced to a level similar to that of the non-conductive resin.

[0111] Therefore, the diameter of the metal powder in the conductive composite material is 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. In this embodiment, aluminum powder is used as an example for illustration. However, the invention is not limited to this; the conductive material may also include nanomaterials.

[0112] The base resin 11a includes: non-conductive resins including acrylonitrile-butadiene-styrene (ABS), silicone, polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), and polydimethylsiloxane (PDMS), and conductive resins including polypyrrole (PPy).

[0113] In this embodiment, polypropylene (PP) is used as the non-conductive resin and polypyrrole (PPy) is used as the conductive resin. The content of PPy in the base resin can be used in the range of 0 to 10 wt%. In this embodiment, a mixing ratio of 5 wt% to 95 wt% of PP and PPy is used as an example. Adding PPy to the base resin 11a can improve the electrical properties of the conductive composite material. However, it is not limited to this; the base resin 11a can also be composed solely of the non-conductive resin.

[0114] The non-heated portion 502 is formed of a material with a lower conductivity than the heated portion 501. The description will take the example of the non-heated portion 502 being made solely of the non-conductive resin. However, it is not limited to this; the non-heated portion 502 may also be made of the same material as the base resin of the heated portion 501. When the non-conductive resin of the heated portion 501 and the non-conductive resin of the non-heated portion 502 are integrally molded from the same material, interface separation can be prevented.

[0115] The configuration of the wire 12 is the same as that in the first embodiment.

[0116] Furthermore, the planar heating element 510 may be connected to or have a control unit (not shown) that supplies or cuts off power and controls the temperature.

[0117] The manufacturing method of the planar heating element of the fifth embodiment of the present invention, as described above, will be described below.

[0118] The planar heating element 510 according to the fifth embodiment of the present invention, as described above, differs from the first embodiment in that the heating part 501 and the non-heating part 502 are manufactured by double injection molding, but the rest of the configuration and function are the same.

[0119] In this embodiment, the mold 2 used for the dual injection molding includes a lower mold 2a and an upper mold 2b, with only the upper mold 2b being replaced as an example. That is, the upper mold 2b includes an upper mold for the heating section and an upper mold for a non-heating section. Therefore, the upper mold for the heating section (not shown) is placed on the lower mold 2a, and the conductive composite material is poured in to mold the heating section 501. Afterwards, the lower mold 2a can be replaced with the upper mold for the non-heating section (not shown), and the non-conductive resin is poured in to mold the non-heating section 502.

[0120] First, a conductive composite material, in which the carbon component, the aluminum powder, the base resin, the stabilizer, and the adhesive are mixed in a preset ratio, is injected between the lower mold 2a and the upper mold (not shown) for the heating part.

[0121] Here, the pair of wires 12 are embedded in a predetermined position, and the conductive composite material is cured by heating the mold 2.

[0122] In this embodiment, the example is described by first feeding the conductive composite material into the mold 20 and then inserting the wire 12. However, this is not the only example; the wire 12 can also be placed first, followed by feeding the conductive composite material. Furthermore, even when feeding the conductive composite material first, the wire 12 can be inserted before further feeding the conductive composite material.

[0123] Therefore, the heating part 501, in which the wire 12 is embedded, is formed in the matrix 11 formed of the conductive composite material.

[0124] Then, the upper mold for the non-heated part is replaced, and the non-conductive resin is injected between the lower mold 2a and the upper mold for the non-heated part and cured.

[0125] Therefore, the non-heating part 502, which is made of the non-conductive resin and is integrally formed with the heating part 501, is formed.

[0126] After the curing is completed, the planar heating element 510 is separated from the mold 2.

[0127] Therefore, by using a dual injection molding process to manufacture the planar heating element 510, which is divided into the heating part 501 and the non-heating part 502, it can be manufactured into various shapes and the manufacturing process is simple, thus saving manufacturing time and manufacturing costs.

[0128] The planar heating element 510 is formed so that only a portion of it is composed of the heating part 501, thus it can be manufactured in various shapes and can be applied to a wider range of products.

[0129] Furthermore, the non-conductive resin included in the heating part 501 and the non-conductive resin included in the non-heating part 502 are made of the same material, so the critical surface of the heating part 501 and the non-heating part 502 does not separate, and they can be more firmly bonded and molded.

[0130] Furthermore, the carbon nanotubes included in the heating part 501, which are conductive materials, can cross-link the critical surfaces of the heating part 501 and the non-heating part 502, thus enabling a more robust bond.

[0131] However, it is not limited to this. It is also possible to inject a first material constituting the substrate of the heating part 501 and a second material constituting the non-heating part 502 into a mold for double injection molding. Various types of molds can be used for the double injection molding.

[0132] in addition, Figure 7 This is a schematic diagram briefly illustrating a planar heating element according to a sixth embodiment of the present invention.

[0133] See Figure 7 The planar heating element 610 according to the sixth embodiment of the present invention is similar in structure and function except that it is formed into a heating part 601 and a non-heating part 602, and the non-heating part 602 extends from at least one of the left and right sides of the heating part 601. Therefore, it will be described in detail with the differences as the focus.

[0134] The heating part 601 is integrally formed with the non-heating part 602, but is made of a different material than the non-heating part 602, and therefore has a different conductivity than the non-heating part 602.

[0135] The heating element 601 is formed by inserting a pair of wires 12 inside a matrix 11 made of a conductive composite material that is a mixture of base resin 11a and conductive material 11b. When power is applied, the conductive material forms an electrical network and generates heat.

[0136] The non-heated portion 602 is formed of a material with a lower conductivity than the heated portion 601. The description will take the example of the non-heated portion 602 being made solely of the non-conductive resin. However, it is not limited to this; the non-heated portion 602 may also be formed of the same material as the base resin of the heated portion 601. When the non-conductive resin of the heated portion 501 and the non-conductive resin of the non-heated portion 502 are integrally molded from the same material, interface separation can be prevented.

[0137] The configuration of the heating part 601, the non-heating part 602, and the wire 12 is the same as that in the fifth embodiment. Furthermore, the manufacturing method of the planar heating element is also the same as that in the fifth embodiment.

[0138] Figure 8 This is a schematic diagram illustrating an example of a clothing management machine utilizing a planar heating element according to a seventh embodiment of the present invention. Figure 9 It is shown Figure 8 A schematic diagram of an ironing board is shown.

[0139] See Figure 8 and Figure 9 According to the seventh embodiment of the present invention, the garment management machine 700 using a planar heating element includes a main body 701, a door 702, and an ironing plate 705 provided on the door 702 for applying pressure to garments to remove wrinkles or to form a straight embossing for trousers. Except that the ironing plate 705 is a planar heating element formed by dividing into a heating part 710 and a non-heating part 720, which is different from the fifth embodiment, the rest of the structure and function are similar. Therefore, the details will be described with the differences as the focus.

[0140] The main body 701 forms a space for storing clothing and is open at the front.

[0141] The door 702 is formed to open and close the front of the body 701.

[0142] The inner side of the door 702 is provided with a clamping part 703, a support plate 704, a pressure plate 706 and an iron plate 705.

[0143] The clamp 703 is located on the upper inner side of the door 702 and is formed as a clamp that can grip the end of the pants.

[0144] The support plate 704 is fixedly installed on the inner side of the door 702 and is configured to face the trousers hanging on the clamp 703. The support plate 704 provides support when the ironing plate 705 and the pressure plate 706 press the trousers.

[0145] The pressure plate 706 is rotatably coupled to the support plate 704 and is used to apply pressure to the iron plate 705 in the direction toward the support plate 704.

[0146] The iron plate 705 is disposed between the pressure plate 706 and the support plate 704, and is configured to rotate from the support plate 704.

[0147] The iron plate 705 may be formed at least in part by the planar heating element. In this embodiment, the iron plate 705 is described as a planar heating element.

[0148] The iron plate 705 is formed by double injection molding of different materials into a heating section 710 and a non-heating section 720. In this embodiment, it is described as having two heating sections 710 on the left and right sides of the iron plate 705.

[0149] The structure and function of the heating part 710 and the non-heating part 720 are the same as those in the fifth embodiment. Furthermore, the manufacturing method and operating method of the planar heating element are also the same as those in the fifth embodiment.

[0150] Figure 10 This is a schematic diagram illustrating an example of a hot and cold water purifier utilizing a planar heating element according to an eighth embodiment of the present invention.

[0151] See Figure 10 According to the eighth embodiment of the present invention, the hot and cold water purifier 800 using a planar heating element includes a main body 801 and a hot water tank 802 disposed inside the main body 801 to contain hot water. Except for the fact that the planar heating element 810 is arranged to contact at least one side of the hot water tank 802, which is different from the fifth embodiment, the other components and functions are similar. Therefore, the details will be described with the differences as the focus.

[0152] The following description uses the outer surface of the planar heating element 810 surrounding the hot water tank 802 as an example. However, it is not limited to this; the planar heating element 810 can be applied to any surface, such as the bottom surface of the hot water tank 802, that can transfer heat to the hot water tank 802.

[0153] The planar heating element 810 is formed by dividing it into a heating part 811 and a non-heating part 812. That is, all parts of the planar heating element 810 except for the heating part 811 are equivalent to the non-heating part 812.

[0154] The structure and function of the heating part 811 and the non-heating part 812 are the same as those in the fifth embodiment. Furthermore, the manufacturing method and operating method of the planar heating element 810 are also the same as those in the fifth embodiment.

[0155] in addition, Figure 11 This is a schematic diagram illustrating an example of a floor heating panel for a building utilizing a planar heating element according to a ninth embodiment of the present invention.

[0156] See Figure 11 According to the ninth embodiment of the present invention, the floor heating panel 900 of a building using a planar heating element 910 is a panel installed on the floor of a building for floor heating. Except for the fact that the planar heating element 910 is installed on the floor heating panel 900, which is different from the first embodiment, the other components and functions are similar. Therefore, the details will be described with the differences as the focus.

[0157] The planar heating element 910 can be disposed inside or on the floor heating panel 900.

[0158] The planar heating element 910 is formed by dividing it into a heating part 911 and a non-heating part 912. That is, all parts of the planar heating element 910 except for the heating part 911 are equivalent to the non-heating part 912.

[0159] The structure and function of the heating part 911 and the non-heating part 912 are the same as those in the fifth embodiment. Furthermore, the manufacturing method and operating method of the planar heating element 910 are also the same as those in the fifth embodiment.

[0160] The present invention has illustrated examples of the content of the base resin, the content of the carbon component, and the diameter and content of the metal powder in the described embodiments, but is not limited thereto and variations are possible. Furthermore, examples of the specific gravity, resistivity, and thermal conductivity values ​​of the conductive composite material have also been illustrated, but are not limited thereto.

[0161] The present invention has been described with reference to the embodiments shown in the accompanying drawings, but these are merely examples, and those skilled in the art will understand that various modifications and equivalent embodiments can be derived therefrom. Therefore, the true scope of protection of the present invention should be determined based on the technical concept of the claims.

[0162] Industrial applicability

[0163] According to the present invention, it is possible to manufacture planar heating elements with simple structure that save manufacturing costs and time, as well as clothing management machines, hot and cold water purifiers and underfloor heating panels for buildings.

Claims

1. A planar heating element, comprising: The heating element comprises a pair of wires inserted at predetermined intervals into a matrix formed of a conductive composite material composed of a base resin and a conductive material. When a power source is applied, creating a potential difference between the wires, heat is generated within the matrix through resistance. The conductive material includes: Carbon components, dispersed within the base resin to form an electrical network; and Metal powder, which is placed between the carbon components, increases the electrical network formed by the carbon components and transfers the resistance heat generated by the carbon components to the surface of the heating part by improving the thermal conductivity of the conductive composite material. The content of the base resin in the conductive composite material is 60 to 72 wt%. Regarding the carbon component content in the conductive composite material, it is between 10 wt% and 17 wt% in order to form the electrical network. The diameter of the metal powder in the conductive composite material is from 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. The specific gravity of the conductive composite is 0.8 to 1.3, the resistivity is 2 to 10 Ωmm, and the thermal conductivity is 156 to 235 kcal / mh℃, tested according to ASTM D792 2 / m, the thermal conductivity is 156 to 235 kcal / mh℃.

2. The planar heating element according to claim 1, wherein: The conductive composite material has a tensile strength of 180 to 200 kgf / cm², as tested according to ASTM D638. 2 .

3. The planar heating element according to claim 1, wherein: The carbon components include carbon nanotubes and graphene. The mixing ratio of the graphene and the carbon nanotubes is 1w%:10w.

4. The planar heating element according to claim 1, wherein: The carbon component includes at least one of carbon fiber and carbon nanotubes. The length of the carbon component is 1 to 100 μm.

5. The planar heating element according to claim 1, wherein: The metal powder includes aluminum powder.

6. The planar heating element according to claim 1, wherein, The base resin includes: This includes non-conductive resins such as acrylonitrile-butadiene-styrene, silicone, polyethylene, polyethylene terephthalate, polypropylene, and polydimethylsiloxane, as well as conductive resins including polypyrrole. The content of the conductive resin in the base resin is greater than 0 and less than 10 wt%.

7. The planar heating element according to claim 1, wherein: The conductive composite material also includes stabilizers and binders. The stabilizer content is 0.1~0.6 wt%. The adhesive content is 0.4~2.1w.

8. The planar heating element according to claim 1, wherein: The wire includes at least one of aluminum wire, copper alloy wire, copper wire, and conductive composite material wire.

9. The planar heating element according to claim 1, wherein, Also includes: The non-heating part, which is separate from the heating part but integrally formed, is made of a material with lower conductivity than the conductive composite material.

10. The planar heating element according to claim 9, wherein: The wire insert is injection molded into the substrate. The heated part and the unheated part are double injection molded.

11. A garment management machine, wherein: Including ironing boards used to press down on clothing to remove wrinkles or create a straightening crease on trousers. The iron plate is a planar heating element including a heating section. A pair of wires in the heating section are inserted at predetermined intervals into a matrix formed of a conductive composite material composed of a base resin and a conductive material. When a power source is applied, creating a potential difference between the wires, heat is generated within the matrix through resistance. The conductive material includes: Carbon components, dispersed within the base resin to form an electrical network; and Metal powder, which is placed between the carbon components, increases the electrical network formed by the carbon components and transfers the resistance heat generated by the carbon components to the surface of the heating part by improving the thermal conductivity of the conductive composite material. The content of the base resin in the conductive composite material is 60 to 72 wt%. Regarding the carbon component content in the conductive composite material, it is between 10 wt% and 17 wt% in order to form the electrical network. The diameter of the metal powder in the conductive composite material is from 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. The conductive composite material has a specific gravity of 0.8 to 1.3 and a resistivity of 2 to 10 Ωmm, as tested according to ASTM D792. 2 / m, with a thermal conductivity of 156 to 235 kcal / mh℃.

12. A hot and cold water purifier comprising a planar heating element, wherein: This includes a planar heating element configured to contact at least one side of a hot water tank containing hot water. The planar heating element includes: The heating element comprises a pair of wires inserted at predetermined intervals into a matrix formed of a conductive composite material composed of a base resin and a conductive material. When a power source is applied, creating a potential difference between the wires, heat is generated within the matrix through resistance. The conductive material includes: Carbon components, dispersed within the base resin to form an electrical network; and Metal powder, which is placed between the carbon components, increases the electrical network formed by the carbon components and transfers the resistance heat generated by the carbon components to the surface of the heating part by improving the thermal conductivity of the conductive composite material. The content of the base resin in the conductive composite material is 60 to 72 wt%. Regarding the carbon component content in the conductive composite material, it is between 10 wt% and 17 wt% in order to form the electrical network. The diameter of the metal powder in the conductive composite material is from 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. The conductive composite material has a specific gravity of 0.8 to 1.3 and a resistivity of 2 to 10 Ωmm, as tested according to ASTM D792. 2 / m, with a thermal conductivity of 156 to 235 kcal / mh℃.

13. A floor heating panel for a building, wherein: Including surface heating elements installed on underfloor heating panels in buildings, The planar heating element includes: The heating element comprises a pair of wires inserted at predetermined intervals into a matrix formed of a conductive composite material composed of a stamped base resin and a conductive material. When a power source is applied, creating a potential difference between the wires, heat is generated within the matrix through resistance. The conductive material includes: Carbon components, dispersed within the base resin to form an electrical network; and Metal powder, which is placed between the carbon components, increases the electrical network formed by the carbon components and transfers the resistance heat generated by the carbon components to the surface of the heating part by improving the thermal conductivity of the conductive composite material. The content of the base resin in the conductive composite material is 60 to 72 wt%. Regarding the carbon component content in the conductive composite material, it is between 10 wt% and 17 wt% in order to form the electrical network. The diameter of the metal powder in the conductive composite material is from 10 nm to 100 nm. Regarding the content of the metal powder, it is above 12 wt% to increase the electrical network between the carbon components and improve the thermal conductivity of the conductive composite material, and below 22 wt% to reduce the specific gravity of the conductive composite material. The conductive composite material has a specific gravity of 0.8 to 1.3 and a resistivity of 2 to 10 Ωmm, as tested according to ASTM D792. 2 / m, with a thermal conductivity of 156 to 235 kcal / mh℃.

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