阅读说明：本技术 一种石墨烯电加热体的辊道窑烧结成膜流水线及生产方法 (Roller kiln sintering film forming production line and production method of graphene electric heating body ) 是由 刘建新 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种石墨烯电加热体的辊道窑烧结成膜流水线及生产方法,包括有流水线生产设备中的传送机构以及安装在流水线传送机构上的电极印花机、石墨烯发热体印花机、绝缘隔热体印花机、辊道窑,先通过第一干燥器将印刷有金属电极层的基体进行第一次加热干燥定型,再通过第二干燥器将印刷金属电极层及石墨烯电加热体层的基体进行第二次加热干燥定型,然后在金属电极层及石墨烯电加热体层上叠加印刷上绝缘隔热保护层后,输送到后续辊道窑设备中进行烧结成膜。这种石墨烯电加热体生产方式,采用了一次烧结成膜,本发明实现了生产效率高,生产工艺流程简单,生产成本低,工业排放量低,降低了生产工人的劳动强度,降低了生产人工成本。(The invention discloses a roller kiln sintering film-forming production line and a production method of a graphene electric heating body, and the production line comprises a conveying mechanism in production line production equipment, and an electrode printing machine, a graphene heating body printing machine, an insulating heat insulator printing machine and a roller kiln which are arranged on the conveying mechanism of the production line. The production method of the graphene electric heating body adopts one-time sintering film forming, and the invention realizes high production efficiency, simple production process flow, low production cost and low industrial emission, reduces the labor intensity of production workers and reduces the production labor cost.)

1. A roller kiln sintering film forming production line of a graphene electric heating body is characterized in that: comprises a production line conveying mechanism consisting of a plurality of conveying devices (1) and an electrode printing machine (2), a graphene heating element printing machine (3), an insulating heat insulator printing machine (4) and a roller kiln (5) which are sequentially arranged on the production line conveying mechanism, wherein a base surface cleaning machine (6) is arranged on the conveying device (1) at the input end of the production line conveying mechanism, a dust remover (7) is arranged between the base surface cleaning machine (6) and the electrode printing machine (2), a thermal imaging flaw detection device (8) is arranged on the conveying device (1) at the output end of the production line conveying mechanism, an electrifying test device (9) is arranged between the thermal imaging flaw detection device (8) and the roller kiln (5), and a first drier (10) is arranged between the electrode printing machine (2) and the graphene heating element printing machine (3), and a second dryer (11) is arranged between the graphene heating body printing machine (3) and the insulating heat insulator printing machine (4).

2. The roller kiln sintering film-forming production line of the graphene electric heating body as claimed in claim 1, is characterized in that: the roller kiln (5) is a firing roller kiln which is heated by burning by adopting a silicon-molybdenum rod electric heating mode or by taking natural gas and water gas as energy sources.

3. The roller kiln sintering film-forming production line of the graphene electric heating body as claimed in claim 1, is characterized in that: the electrifying test device (9) comprises a first electrifying test end (91) and a second electrifying test end (92) along the transmission direction of the assembly line transmission mechanism, the first electrifying test end (91) and the second electrifying test end (92) are respectively installed at the left side and the right side of the transmission device (1), a plurality of conductive press roller shafts (93) extend towards the inner side of the first electrifying test end (91) and the second electrifying test end (92), electrifying press rollers (94) capable of freely and flexibly rotating are installed on the press roller shafts (93), the electrifying press rollers (94) can self-adaptively adjust the press contact tightness of the electrifying press rollers (94) contacted with the base body according to the thickness of the base body, the electrifying press rollers (94) can be reliably and electrically connected with the base body, and electrifying ends (95) are arranged at the centers of the outer sides of the first electrifying test end (91) and the second electrifying test end (92), the electrified end (95) is respectively through electric connection circular telegram compression roller (94) and power, just the both sides of circular telegram end (95) are provided with telescopic link (96), cut off fixed hookup through the insulator between telescopic link (96) and circular telegram testing arrangement (9), ensure that telescopic link (96) can not electrified to shorten the distance between the first circular telegram test end (91) of coming and second circular telegram test end (92) of coming control regulation through the extension.

4. A roller kiln sintering film-forming production line production method of a graphene electric heating body is characterized by comprising the following steps: a roller kiln sintering film-forming production line comprising the graphene electric heating body as claimed in any one of claims 1 to 3, and the production method comprises the following steps:

the method comprises the following steps that firstly, a base body is placed on a conveying device (1) and conveyed to the position below a base body surface cleaning machine (6) to clean the surface of the base body, after cleaning is completed, the base body is conveyed to the position below a dust remover (7) through the conveying device (1), and the dust on the surface of the base body is removed through the dust remover (7);

secondly, when the substrate after the first step is conveyed to the lower part of the electrode printing machine (2), printing metal conductive paste on the surface of the substrate through the electrode printing machine (2) to prepare a semi-finished product A printed with a metal electrode; the electrode printing machine (2) is provided with a printing net A, and the shape and the pattern of the electrode are determined and realized by the printing net A;

step three, conveying the semi-finished product A after the step two to a first dryer (10), and heating and drying the semi-finished product A by the first dryer (10) to mainly carry out proper drying and shaping on the metal electrode layer which is printed on the surface;

conveying the semi-finished product B subjected to the step four to a second dryer (11), and heating and drying the semi-finished product B by the second dryer (11), wherein proper drying and shaping are mainly carried out on the graphene electric heating body ink layer which is printed on the surface of the semi-finished product B;

conveying the semi-finished product B subjected to the fourth step to a second dryer (11), and heating and drying the semi-finished product B by the second dryer (11), wherein proper drying and shaping are mainly carried out on the graphene electric heating body ink layer which is printed on the surface of the semi-finished product B;

sixthly, when the semi-finished product B after the step five is conveyed to the lower part of an insulating and heat-insulating printing machine (4), overlapping and printing insulating and heat-insulating printing ink on a metal electrode layer and a graphene electric heating layer on the surface of the semi-finished product B through the insulating and heat-insulating printing machine (4) to prepare a semi-finished product C printed with the metal electrode layer, the graphene electric heating layer and an insulating and heat-insulating protection layer; the insulating and heat-insulating body decorating machine (4) is provided with a printing net C, and the shape and the pattern of the insulating and heat-insulating protective layer are determined and realized by the printing net C;

step seven, conveying the semi-finished product C obtained in the step six into a roller kiln (5), and sintering the metal electrode layer, the graphene electric heating body layer and the insulating and heat-insulating protective layer of the semi-finished product C to form a film through the roller kiln (5) to obtain a finished product;

and step eight, conveying the finished product after the step seven to an electrifying test device (9) for electrifying test inspection, wherein the finished product gradually heats during electrifying test, detecting whether the heating position of the finished product is uniform or not through a heating imaging picture when the finished product subjected to electrifying heating passes through a subsequent thermal imaging flaw detection device (8), judging whether the process of the heating body reaches the standard or not, and conveying the product to the next procedure for sorting.

5. The roller kiln sintering film-forming production line production method of the graphene electric heating body according to claim 4, characterized in that: the printing screen A in the second step is 180-250 meshes.

6. The roller kiln sintering film-forming production line production method of the graphene electric heating body according to claim 4, characterized in that: the printing screen B in the third step and the printing screen C in the sixth step are 100-200 meshes.

7. The roller kiln sintering film-forming production line production method of the graphene electric heating body according to claim 4, characterized in that: the first dryer (10) in the third step and the second dryer (11) in the fifth step are tunnel dryers which are mutually supplemented by superposition of two heat sources in a heating mode of utilizing waste heat of a roller kiln and a silicon-molybdenum rod, and can also be tunnel electric dryers in a heating mode of utilizing infrared light waves or silicon-molybdenum rods, and the heating temperature of the tunnel electric dryers can realize flexible setting adjustment and intelligent constant control between normal temperature and 400 ℃.

8. The roller kiln sintering film-forming production line production method of the graphene electric heating body according to claim 4, characterized in that: the graphene electric heating body ink in the third step is prepared by blending graphene powder, a far infrared emitting agent, FB resin powder and ethanol according to a formula proportion.

9. The roller kiln sintering film-forming production line production method of the graphene electric heating body according to claim 4, characterized in that: and the insulating heat insulator ink in the sixth step is prepared by mixing mica powder, porcelain powder, quartz powder, FB resin powder and ethanol according to a formula ratio.

Technical Field

The invention relates to the technical field of graphene electric heating, in particular to a roller kiln sintering film-forming production line and a production method of a graphene electric heating body.

Background

Graphene, one of the materials of greatest interest in recent years, is a honeycomb structure formed by a single layer of carbon atoms, and is one of the materials with the smallest thickness, the lightest weight and the greatest strength in the world. Meanwhile, graphene also has good thermal properties, researches show that graphene is the substance with the highest thermal conductivity in the world, the thermal conductivity coefficient is as high as 5000W/m.K and is 50-100 times of that of common metals, the percolation threshold is only 0.2 wt%, and a single-layer two-dimensional structure of graphene is easy to form a thermal conduction channel in a matrix, so that graphene is an ideal filler for improving the thermal conductivity.

The graphene heating material is a novel material for converting electric energy into heat energy, is different from another heating material with heating modes such as an electric heating tube, a heating wire, a microwave generator, an electromagnetic generator, light wave radiant heat and the like, can directly convert the electric energy into the heat energy in a conductive mode, and can transfer the heat energy into the air in a radiation and conduction mode.

The graphene heating material is originated in an electric heating base material, is attached to any carrier by the self electric heating characteristic, can be made into a heating body with any power, and can also be suitable for being used in alternating current and direct current environments with various voltages. The basic heating body has simple manufacturing process and can be manufactured by adopting the modes of spraying, printing, diaphragm, bonding, coating, electroplating and the like.

However, the existing graphene heating body has the disadvantages of more production processes, complex process, more manual intervention operations, lower production efficiency, higher production labor cost and high production cost.

Disclosure of Invention

In order to solve the problems, the invention provides a roller kiln sintering film-forming production line of a graphene electric heating body, which comprises a production line conveying mechanism consisting of a plurality of conveying devices, and an electrode printing machine, a graphene heating body printing machine, an insulating heat insulator printing machine and a roller kiln which are sequentially arranged on the production line conveying mechanism, a basal body surface cleaning machine is arranged on the conveying equipment at the input end of the assembly line conveying mechanism, a dust remover is arranged between the basal body surface cleaning machine and the electrode printing machine, a thermal imaging flaw detection device is arranged on the conveying device at the output end of the assembly line conveying mechanism, an electrifying test device is arranged between the thermal imaging flaw detection equipment and the roller kiln, a first dryer is arranged between the electrode printing machine and the graphene heating body printing machine, and a second dryer is arranged between the graphene heating body printing machine and the insulating heat insulator printing machine.

Further, the roller kiln is a firing device which is heated by adopting a silicon-molybdenum rod electric heating mode or a combustion heating mode by taking natural gas and water gas as fuels.

Furthermore, the electrifying test device comprises a first electrifying test end and a second electrifying test end along the transmission direction of the assembly line conveying mechanism, the first electrifying test end and the second electrifying test end are respectively installed on the left side and the right side of the conveying equipment, a plurality of conductive press roller shafts extend towards the inner sides of the first electrifying test end and the second electrifying test end, the press roller shafts are provided with conductive electrifying press rollers capable of flexibly rotating, and the electrifying press rollers can adaptively adjust the press contact tightness between the electrifying press rollers and the base body according to the thickness of the base body so as to ensure good electrical connection between the electrifying press rollers and the base body electrodes; the center of the outer sides of the first electrifying test end and the second electrifying test end is provided with an electrifying end, the electrifying ends are respectively connected with an electrifying compression roller and a power supply through electric conductivity, telescopic rods are arranged on two sides of each electrifying end, and the telescopic rods are fixedly connected with an electrifying test device through insulators to ensure that the telescopic rods are not electrified; the telescopic rod controls and adjusts the distance between the first electrifying testing end and the second electrifying testing end by extending and shortening.

A roller kiln sintering film-forming production line production method of a graphene electric heating body comprises the roller kiln sintering film-forming production line of the graphene electric heating body, and comprises the following steps:

the method comprises the following steps that firstly, a base body is placed on a conveying device and conveyed to the position below a base body surface cleaning machine to clean the surface of the base body, the base body is conveyed to the position below a dust remover through the conveying device after cleaning is finished, and the dust on the surface of the base body is removed completely through the dust remover;

secondly, when the substrate after the first step is conveyed to the lower part of an electrode printing machine, printing metal conductive paste on the surface of the substrate through the electrode printing machine to prepare a semi-finished product A printed with a metal electrode layer;

step three, when the semi-finished product A after the step two is conveyed to a first dryer, the first dryer carries out heating, drying and shaping on the metal conductive slurry layer on the surface of the semi-finished product A;

step four, when the semi-finished product A after the step three is conveyed to the lower part of the graphene heating element printing machine, printing graphene electric heating element printing ink on the surface of the semi-finished product A through the graphene heating element printing machine to obtain a semi-finished product B printed with a metal electrode layer and a graphene electric heating element layer;

step five, when the semi-finished product B after the step four is conveyed to a second dryer, the second dryer carries out heating, drying and shaping on the graphene electric heating body layer on the surface of the semi-finished product B;

sixthly, when the semi-finished product B after the step five is conveyed to the lower part of an insulating and heat-insulating body printing machine, printing insulating and heat-insulating body printing ink on a metal electrode layer and a graphene electric heating body layer on the surface of the semi-finished product B through the insulating and heat-insulating body printing machine to obtain a semi-finished product C printed with the metal electrode layer, the graphene electric heating body layer and an insulating and heat-insulating protection layer;

step seven, sintering the metal electrode layer, the graphene electric heater layer and the insulating and heat-insulating protective layer of the semi-finished product C to form a film through the roller kiln when the semi-finished product C after the step six is conveyed to the roller kiln, and thus obtaining a finished product;

and step eight, conveying the finished product after the step seven to a power-on test device for power-on test inspection, wherein the finished product gradually heats during the power-on test, the heated position of the finished product can be detected whether to be uniform or not through a thermal imaging image of thermal imaging flaw detection equipment, whether the heating body process reaches the standard or not can be defined, and then sorting the product.

Further, the printing screen A in the second step is 180-250 meshes.

Further, the printing screen B in the third step and the printing screen C in the sixth step are 100-200 meshes.

Further, the first dryer in the third step and the second dryer in the fifth step are tunnel dryers that are mutually supplemented by superposition of two heat sources in a heating mode of utilizing waste heat of the roller kiln and a silicon-molybdenum rod, and also can be tunnel electric dryers in a heating mode of utilizing infrared light waves or silicon-molybdenum rods, and the heating temperature of the tunnel electric dryers can be flexibly set and adjusted and intelligently and constantly controlled between normal temperature and 400 ℃.

Further, the graphene electric heating body ink in the third step is prepared by blending graphene powder, a far infrared emitting agent, FB resin powder and ethanol according to a formula proportion.

Further, the insulating and heat insulating ink in the sixth step is prepared by mixing mica powder, porcelain powder, quartz powder, FB resin powder and ethanol according to a formula ratio.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a roller kiln sintering film-forming production line and a production method of a graphene electric heating body, wherein a matrix is conveyed to each processing device for processing through a production line conveying mechanism consisting of a plurality of conveying devices; firstly, carrying out primary heating, drying and shaping on a substrate printed with a metal electrode layer through a first dryer, then carrying out secondary heating, drying and shaping on the substrate printed with the metal electrode layer and a graphene electric heating layer through a second dryer, then continuously overlapping and printing an insulating and heat-insulating protective layer on the metal electrode layer and the graphene electric heating layer, and then conveying the substrate to subsequent roller kiln equipment for sintering and film forming; the production method of the graphene electric heating body adopts one-time sintering film forming, and has the advantages of high production efficiency, simple production process flow, low production cost and low industrial emission; the invention realizes the automation of the production process, reduces the number of workers, reduces the labor intensity of production workers and lowers the labor cost of production.

Drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic view showing the structure of the substrate surface cleaning step in the present invention.

FIG. 3 is a schematic view showing the structure of the primary drying step and the secondary drying step in the present invention.

FIG. 4 is a schematic structural diagram of a sintering film-forming process in a roller kiln according to the present invention.

Fig. 5 is a schematic view showing the structure of a product inspection process in the present invention.

FIG. 6 is a schematic structural diagram of the power-on test apparatus of the present invention.

Fig. 7 is a schematic flow diagram of the framework of the present invention.

In the figure: conveying equipment 1, electrode calico printing machine 2, graphite alkene heat-generating body calico printing machine 3, insulating insulator calico printing machine 4, roller kilns 5, base member surface cleaning machine 6, dust remover 7, thermal imaging detection equipment 8 that detects a flaw, circular telegram testing arrangement 9, first circular telegram test end 91, second circular telegram test end 92, compression roller axle 93, circular telegram compression roller 94, circular telegram end 95, telescopic link 96, first desicator 10, second desicator 11.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, the definitions "first" and "second" are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly including one or more of such features.

Referring to fig. 1 to 7, the roller kiln sintering film-forming production line for a graphene electric heating body provided by the invention comprises a production line conveying mechanism consisting of a plurality of conveying devices 1, and an electrode printing machine 2, a graphene heating body printing machine 3, an insulating heat insulator printing machine 4 and a roller kiln 5 which are sequentially arranged on the production line conveying mechanism, wherein a substrate surface cleaning machine 6 is arranged on the conveying device 1 at the input end of the production line conveying mechanism, a dust remover 7 is arranged between the substrate surface cleaning machine 6 and the electrode printing machine 2, a thermal imaging flaw detection device 8 is arranged on the conveying device 1 at the output end of the production line conveying mechanism, an electrifying test device 9 is arranged between the thermal imaging flaw detection device 8 and the roller kiln 5, a first dryer 10 is arranged between the electrode printing machine 2 and the graphene heating body printing machine 3, and a second dryer 11 is arranged between the graphene heating body printing machine 3 and the insulating heat insulator printing machine 4 (ii) a Carry the base member to each processing equipment through the assembly line transport mechanism who comprises a plurality of conveying equipment 1 and process, carry out heating drying for the first time through first desicator 10 with the base member of printing metal electrode layer earlier, rethread second desicator 11 carries out heating drying for the second time with the base member of printing metal electrode layer and graphite alkene electrical heating body layer, then continue to print insulating thermal protection layer on the base member surface that has metal electrode layer and graphite alkene electrical heating body layer, carry roller kilns 5 to carry out a sintering filming afterwards.

As a further embodiment of the present invention, the roller kiln 5 is a firing facility that is heated by an electrical heating method using a silicon-molybdenum rod or by a combustion method using natural gas or water gas as a fuel.

As a further embodiment of the present invention, the energization testing device 9 includes a first energization testing end 91 and a second energization testing end 92 along the conveying direction of the assembly line conveying mechanism, the first energization testing end 91 and the second energization testing end 92 are respectively installed at the left side and the right side of the conveying device 1, a plurality of conductive pressure roller shafts 93 extend towards the inner sides of the first energization testing end 91 and the second energization testing end 92, and the pressure roller shafts 93 are sleeved with energization pressure rollers 94 capable of flexibly rotating; the electrified pressing roller 94 can self-adaptively adjust the pressing and contacting tightness of the electrified pressing roller 94 in contact with the base body according to the thickness of the base body, and ensure that the electrified pressing roller 94 can be in reliable electric conduction connection with the base body; the centers of the outer sides of the first electrifying testing end 91 and the second electrifying testing end 92 are provided with electrifying ends 95, the electrifying ends 95 are respectively connected with an electrifying compression roller 94 and a power supply through electric conductivity, telescopic rods 96 are arranged on two sides of each electrifying end 95, the telescopic rods 96 are fixedly connected with the electrifying testing device 9 through insulators, and the telescopic rods 96 are ensured not to be electrified; the telescopic rod 96 is used for controlling and adjusting the distance between the first electrifying testing end 91 and the second electrifying testing end 92 by lengthening and shortening; when the prepared finished product is conveyed to the final product inspection process, the metal electrodes on two sides of the graphene heating body are respectively contacted with the electrifying compression roller 94 on the first electrifying test end 91 and the electrifying compression roller 94 on the second electrifying test end 92, a plurality of electrifying compression rollers 94 are arranged along the transmission direction of the assembly line conveying mechanism, the first electrifying test end 91 and the second electrifying test end 92 are respectively connected to the input end of a power supply, so that the metal electrodes are continuously switched on, the graphene heating body is electrified to generate heat, and then the heating positions of the finished product are detected to be uniform by the thermal imaging flaw detection equipment 8; in addition, the roller type electrified electrode end can be controlled in a telescopic mode, so that the electrified electrode end can be suitable for graphene heating bodies with different sizes.

A roller kiln sintering film-forming production line production method of a graphene electric heating body comprises the roller kiln sintering film-forming production line of the graphene electric heating body, and comprises the following steps:

a substrate conveying process: placing a substrate made of an insulating material on a conveying device 1 at the input end of the assembly line conveying mechanism;

cleaning the surface of the substrate: conveying the substrate to the lower part of a substrate surface cleaning machine 6 to clean the surface of the substrate, conveying the substrate to the lower part of a dust remover 7 through conveying equipment 1 after cleaning is finished, and removing dust on the surface of the substrate completely through the dust remover 7;

a step of printing a metal electrode: when the substrate after the substrate surface cleaning process is conveyed to the lower part of the electrode printing machine 2, the electrode printing machine 2 prints metal conductive paste on the substrate surface to prepare a semi-finished product A printed with a metal electrode layer, wherein the printed metal electrode comprises and is not limited to other printing ink type materials capable of preparing electrodes, and the printing ink type materials comprise sintered conductive paste;

primary drying of the substrate: when the semi-finished product A subjected to the metal electrode printing process is conveyed to the first dryer 10, the first dryer 10 heats, dries and shapes the metal conductive paste electrode layer on the surface of the semi-finished product A;

printing a graphene heating element: when the semi-finished product A after the primary drying procedure is conveyed to the lower part of a graphene heating element printing machine 3, printing graphene electric heating element printing ink on the surface of the semi-finished product A through the graphene heating element printing machine 3 to prepare a semi-finished product B printed with a metal electrode layer and a graphene electric heating element layer,

and (3) secondary drying of the matrix: conveying the semi-finished product B subjected to the working procedure of printing the graphene heating body to a second dryer 11, and heating, drying and shaping a metal electrode layer and a graphene electric heating body layer on the surface of the semi-finished product B by the second dryer 11;

printing an insulating and heat insulating process: when the semi-finished product B after the matrix secondary drying process is conveyed to the position below an insulating and heat-insulating body printing machine 4, printing insulating and heat-insulating body printing ink on a metal electrode layer and a graphene electric heating layer on the surface of the semi-finished product B through the insulating and heat-insulating body printing machine 4 in an overlapping mode to obtain a semi-finished product C printed with the metal electrode layer, the graphene electric heating layer and an insulating and heat-insulating protective layer;

sintering and film forming procedures of the roller kiln: when the semi-finished product C after the printing insulating and heat insulating process is conveyed into the roller kiln 5, sintering the metal electrode layer, the graphene electric heating layer and the insulating and heat insulating protective layer of the semi-finished product C to form a film through the roller kiln 5, so as to obtain a finished product;

and (3) product inspection working procedures: conveying the finished product subjected to the sintering film-forming process of the roller kiln 5 to an energization testing device 9 for energization testing inspection, wherein the finished product gradually heats in the energization testing, and when an electric heating body subjected to electric heating passes through a thermal imaging flaw detection device 8, whether the heating position of the finished product is uniform can be detected through a thermal imaging picture;

and (3) subsequent procedures of products: and (4) sorting the products after the heating test in the next process, and screening unqualified products.

As a further embodiment of the invention, the printing screen A in the step of printing the metal electrode is 180-250 meshes.

As a further embodiment of the invention, the printing screen B in the step of printing the graphene heating element and the printing screen C in the step of printing the insulating heat-insulating material are 100-200 meshes.

As a further example of the present invention, the heating temperature of the first dryer 10 in the primary matrix drying step and the second dryer 11 in the secondary matrix drying step is between normal temperature and 400 ℃.

As a further embodiment of the present invention, the graphene electric heater ink in the step of printing the graphene heating element includes, but is not limited to, graphene powder, a far infrared emitting agent, FB resin powder and ethanol, which are mixed according to a formula ratio, wherein the graphene powder, the far infrared emitting agent and the FB resin powder are first mixed and then stirred uniformly, and then the ethanol is added and mixed to form an ink slurry; the FB resin powder is 14-180 mu m, and the particle size of the graphene powder is 30-60 nm.

As a further embodiment of the invention, the insulating and heat-insulating protective layer in the printing insulating and heat-insulating process includes and is not limited to a protective layer material prepared by mixing mica powder, porcelain powder, quartz powder, FB resin powder and ethanol according to a formula ratio. One of the insulating and heat-insulating protective layers is prepared by mixing mica powder, porcelain powder, quartz powder, FB resin powder and ethanol according to a formula proportion, firstly mixing the mica powder, the porcelain powder, the quartz powder and the FB resin powder, uniformly stirring, and then adding the ethanol for mixing to form ink slurry; the FB resin powder is 14-180 mu m, the particle size of the mica powder is smaller than 800 meshes, and the particle size of the quartz powder is larger than 600 meshes.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.