Forming process of artificial board

Abstract

The invention belongs to the technical field of wood processing, and particularly relates to a forming process of an artificial board, which mainly comprises the following steps of: heating and pressurizing a plurality of layers of blanks under the action of an adhesive; according to the heating mode, heat is provided in the mode that a graphene material is electrified for heating, the graphene material is graphene crystals or graphene tows, heat is provided for the forming process of the artificial board in the mode that the graphene material is electrified for heating, the heat utilization rate is high, energy consumption is low, heating is fast, safety is achieved, and energy is saved; the problems of high energy consumption, high pollution and high safety risk in the artificial board production industry can be fundamentally solved, and the method is suitable for industrial production and application.

Description

Technical Field

[0001] The invention belongs to the technical field of wood processing, and in particular relates to a forming process of an artificial board. Background Art

[0002] A hot press is a device used in the artificial board forming process to form a thicker overall blank by heating and pressurizing multi-layer blanks (or scraps) under the action of adhesive. Its main working part is the heating plate. A hot press often has several or dozens of hot pressing plates. These hot pressing plates can move up and down under the action of mechanical force to pressurize the multi-layer blanks filled in two hot pressing plates. While pressurizing, the hot pressing plate itself acts as a heat conductor to transfer high-temperature heat energy to the pressed blank, so that the multi-layer blank between the two pressing plates is heated while being pressed.

[0003] In the current hot press, the heat energy for the hot plate is generally supplied by natural gas to heat the heat transfer oil (medium) in the boiler (mold temperature controller), which is then pressurized by a circulating pump and transported to the hot plate through a pipeline to ensure that the hot plate has the necessary working temperature. However, my country relies on large amounts of imported natural gas, which produces a large amount of CO2 and NO when burned. S Harmful gases such as chlorine and chlorine are produced, and the heat loss of the boiler (mold temperature controller) furnace body, exhaust port, circulation pump, pipeline, valve, etc. is large, and the thermal energy utilization rate is about 45%. At the same time, a large number of safety accidents are related to it. Laboratories or small batch production often use resistance wires and heating tubes to heat the pressing plate, which are easy to oxidize and have a short service life. During use, problems are prone to occur, delaying production, and the cost is high. In addition, the thermoelectric conversion rate is relatively low and the heating speed is slow. This has also caused the use of resistance wires and heating tubes to heat the pressing plate in this field to be very rare, and industrial production applications are not utilized. Summary of the invention

[0004] In response to the current technical problems, the present invention provides a forming process for artificial boards, which uses graphene materials to generate heat through electricity to provide heat for the artificial board forming process. It has a fast heating speed, high heat utilization rate, low energy consumption, safety, environmental protection and energy saving, and can fundamentally solve the current situation of high energy consumption, high pollution and high safety risks in the artificial board production industry.

[0005] The technical solution of the present invention is as follows:

[0006] A forming process for an artificial board mainly comprises: heating and pressurizing a multilayer blank under the action of an adhesive, wherein the heating method is to provide heat by electrically heating a graphene material, wherein the graphene material is a graphene crystal or a graphene filament bundle.

[0007] Preferably, the crystal particle size of the graphene is ≤3 microns and the purity is ≥98%.

[0008] Preferably, the graphene material is 100-300 g / m 2 set up.

[0009] Graphene heating materials have excellent thermal conductivity. The carrier (conductive ion) of graphene at room temperature is 15000cm / (V·s), which is ten times higher than that of silicon materials and more than twice that of indium antimonide (nSb), the material with the highest known carrier mobility. Graphene materials need to be energized to generate heat. When the electrodes at both ends of the graphene heating layer are energized, the carbon molecules in the electric heating layer generate phonons, ions and electrons in the resistor. The generated carbon molecular groups rub and collide with each other to generate heat energy, which is also called Brownian motion. The heat energy generated by the collision is uniformly radiated in a planar manner by controlling the far infrared rays with a wavelength of 5-14 microns. The total conversion rate of effective electric heat energy of graphene materials is more than 99.5%. At the same time, the superconductivity of graphene materials can ensure stable heating performance. The present invention converts electrical energy into thermal energy through the instantaneous heating characteristics of the graphene heating layer, avoiding the problems of high energy consumption, high risk, low heat conversion efficiency, high cost, environmental pollution, etc. of traditional heat-providing methods such as heat transfer oil, and avoids the problems of short service life, easy failure, slow heating, low heat conversion efficiency, high cost, etc. of heat-providing methods such as resistance wires and heating tubes.

[0010] Preferably, the specific equipment used in the method of heating the graphene material by electricity is a hot press heating device. The heating device is arranged on the hot press, and the heating device comprises a first protective plate, a first insulating layer, a graphene heating layer, a second insulating layer, and a second protective plate in sequence; the two ends of the graphene heating layer are connected to the control system through wires, and a temperature measuring element is arranged on the graphene heating layer, and the temperature measuring element is connected to the control system through wires.

[0011] Further preferably, the first insulating layer and the second insulating layer are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV to 1MΩ / kV, high temperature resistance of more than 300°C, and a strength of 100 to 300g / m 2 set up.

[0012] Further preferably, the first protection plate and the second protection plate are both made of metal heat-conducting materials. More preferably, the thickness of the first protection plate and the second protection plate are both ≥15 mm.

[0013] Further preferably, grooves are respectively provided on the opposing surfaces of the first protective plate and the second protective plate, and the first insulating layer, the graphene heating layer and the second insulating layer are arranged in the grooves, and a third insulating layer is arranged between the first protective plate, the second protective plate and the graphene heating layer; semi-through holes are respectively arranged on the side walls of the grooves of the first protective plate and the second protective plate, which together constitute a through hole; the first protective plate and the second protective plate are connected, and the wires connected to the graphene heating layer and the wires connected to the temperature measuring element pass through the third insulating layer and the through holes on the upper and lower metal heat conducting plates to connect to the control system.

[0014] More preferably, when the through hole is only provided at one end of the heating device, half grooves are provided on the side walls of the grooves of the first protective plate and the second protective plate respectively, which together form a preset wire groove, in which a wire is provided, and the preset wire groove is connected with the through hole.

[0015] The present invention provides a forming process for artificial boards, which uses graphene materials to generate electricity and heat instead of traditional heating methods, thus avoiding the generation of CO, CO2, NO S The invention can generate heat instantly, effectively improve work efficiency and increase production capacity; no full-time technicians are required to maintain the boiler, and no heat transfer oil is required to be replaced and replenished regularly, which improves efficiency and saves manpower and material resources; in particular, in recent years, the country has vigorously developed green electricity, electricity prices have fallen, and natural gas prices have risen every year. The use of the heat press of the invention can save more than 35% of costs; since boilers, pressure pipes and natural gas are not used, safety hazards are eliminated and the risk factor is reduced; compared with traditional heat transfer oil, resistance wire, heating tube and other heat supply methods, the heating speed is increased, the heat conversion efficiency is increased, the cost is reduced, the service life is increased, the production efficiency is increased, the occurrence of safety accidents is avoided, the safety factor is increased, and it is conducive to industrial production; the heating device can be manufactured in different specifications (such as 4×8 feet, 4×9 feet, 5×8 feet) according to needs; the heating device used in the heat press has been tested for 3000 hours continuously, and the equipment operates normally and has a long service life.

[0016] The present invention provides a forming process for artificial boards, which uses a graphene material to generate heat by electricity to provide heat for the forming of the artificial boards. The process has fast heating speed, high heat utilization rate, low energy consumption, safety, environmental protection and energy saving. It can fundamentally solve the current situation of high energy consumption, high pollution and high safety risks in the artificial board production industry, and can be used for industrial production applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the heating device of the hot press machine of the present invention;

[0018] Figure 2 A schematic diagram of the structure of the second protective plate when only one through hole is provided for the heating device of the hot press;

[0019] Figure 3 It is a schematic diagram of the structure of the hot pressing device after assembly;

[0020] Figure 4 It is a schematic diagram of the structure of installing the hot pressing device into the hot pressing machine;

[0021] In the figure, 1 is the first protective plate, 2 is the first insulating layer, 3 is the graphene heating layer, 4 is the second insulating layer, 5 is the second protective plate, 6 is the groove, 7 is the preset wire groove, 7-1 is the half groove A, 7-2 is the half groove B, 8 is the through hole, 8-1 is the half through hole A, 8-2 is the half through hole B, 9 is the heating device, 10 is the frame, and 11 is the lifting device. DETAILED DESCRIPTION

[0022] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0023] A forming process of an artificial board, wherein the forming process mainly comprises: heating and pressurizing a multilayer blank (or a scrap) under the action of an adhesive, wherein the heating method is to provide heat by heating a graphene material by electricity, wherein the graphene material is a graphene crystal or a graphene filament bundle; the crystal particle size of the graphene is ≤3 microns, the purity is ≥98%, and the graphene material is 100-300 g / m 2 The specific graphene material is 100g / m 2 , 150g / m 2 , 200g / m 2 or 300g / m 2 Setting: If the artificial board is a multilayer board or a blockboard, the required temperature is 135-160℃, and the specific temperature is 135℃, 140℃, 150℃ or 160℃;

[0024] The specific equipment used in the above-mentioned graphene material electrical heating method is a hot press heating device 9. As shown in 1-4, the heating device 9 is arranged on the hot press; the heating device 9 includes a first protective plate 1, a first insulating layer 2, a graphene heating layer 3, a second insulating layer 4, and a second protective plate 5 in sequence; the two ends of the graphene heating layer 3 are connected to the control system through wires, and a temperature measuring element is arranged on the graphene heating layer 3 (the temperature measuring element is not shown in the figure), and the temperature measuring element is connected to the control system through a wire.

[0025] The first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV to 1MΩ / kV, an insulation resistance of 0.5MΩ / kV, 0.8MΩ / kV or 1MΩ / kV, and a high temperature resistance of more than 300°C, with a strength of 100 to 300g / m 2 Settings, you can choose 100g / m 2 , 150g / m 2 , 200g / m 2 or 300g / m 2 .

[0026] The first protection plate 1 and the second protection plate 5 are both made of manganese steel or carbon steel with a thickness of ≥15 mm.

[0027] The first protective plate 1 and the second protective plate 5 are respectively provided with grooves 6 on the opposite surfaces (that is, the first protective plate 1 and the second protective plate 5 are provided with grooves 6, and the first protective plate 1 and the second protective plate 5 are provided with the surfaces of the grooves 6 corresponding to each other), the first insulating layer 2, the graphene heating layer 3 and the second insulating layer 4 are arranged in the grooves 6, and the third insulating layer is arranged between the first protective plate 1 and the second protective plate 5 and the graphene heating layer 3, that is, the graphene heating layer 3 is surrounded by the first insulating layer 2, the second insulating layer 4 and the third insulating layer, and the insulating glue used in the third insulating layer is the same as that used in the first insulating layer, and the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element pass through the third insulating layer, the upper and lower metal heat conducting plates (through holes 8) to connect to the control system; semi-through holes are respectively arranged on the side walls of the grooves 6 of the first protective plate 1 and the second protective plate 5, which together constitute the through hole 8, and the through hole 8 is for the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element to pass through; the first protective plate 1 and the second protective plate 5 are connected.

[0028] When the through hole 8 is only provided at one end of the heating device 9, half grooves are respectively provided on the side walls of the groove 6 of the first protective plate 1 and the second protective plate 5, which together constitute a preset wire groove 7, in which the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element are provided, and the preset wire groove 7 is connected to the through hole 8.

[0029] The control system adopts a PLC control system, the specific equipment is a control cabinet, and the control system is electrically connected to the alarm device. First, set a suitable temperature in the control system, and the temperature measuring element transmits the monitored temperature to the control system. When the system detects that the temperature has not reached the preset temperature, the control system controls to open the switch and start to energize the graphene heating layer 3. When the temperature reaches the set temperature, the temperature measuring element transmits the monitored temperature to the control system. When the system detects that the temperature reaches the preset temperature, the control system controls to close the switch and stop energizing the graphene heating layer 3; the temperature measuring element transmits the monitored temperature to the control system. When the temperature is too high or too low for a long time and exceeds a certain limit, the control system will control the alarm device to send an alarm signal, which can effectively verify whether the monitoring device is operating normally and effectively prevent the occurrence of safety accidents.

[0030] The above-mentioned heating device 9 is double-sided heating. The heating device 9 can replace the original hot pressing plate on the hot press. The heating device 9 provided by the present invention is used as the hot pressing plate of the hot press. During actual installation, the original hot pressing plate on the hot press can be removed and the heating device 9 can be installed. The installation method is the same as the installation method of the original hot pressing plate. The two ends of the heating device 9 are movably connected to the frame 10 of the hot press. The bottom heating device 9 is connected to the lifting device (such as a cylinder), and the top heating device 9 is fixedly connected to the frame. Since the heating device 9 can heat on both sides, it can be applied to the hot pressing molding process of artificial boards and can provide a temperature of 135-160°C.

[0031] Example 1

[0032] A forming process of artificial board:

[0033] The multilayer blank (or scrap) is heated and pressurized under the action of an adhesive. The artificial board is a multilayer board, and the required temperature is 160°C. The heating method adopts the method of heating the graphene material by electricity to provide heat. The graphene material is a graphene crystal or a graphene filament bundle. The crystal particle size of the graphene is ≤3 microns, the purity is ≥98%, and the graphene material is 150g / m 2 Setting; the first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, the insulation resistance is 1MΩ / kV, high temperature resistance above 300℃, 150g / m 2 set up.

[0034] Example 2

[0035] The specific equipment used in the graphene material heating method is a hot press heating device 9, and a hot press heating device 9 is specifically as follows:

[0036] The heating device 9 can heat on both sides, and the heating device 9 can replace the original hot pressing plate on the hot pressing machine, such as Figure 4As shown, the topmost heating device 9 is fixedly connected to the frame 10, and the two ends of the heating devices 9 at other positions are movably connected to the frame 10 of the hot press to ensure that the heating device 9 can move up and down. The bottom heating device 9 is connected to the lifting device 11 (such as a cylinder). The specific frame 10 is provided with a plurality of slots, and the two ends of the heating device 9 are arranged in the slots. The two ends of each layer of the heating device 9 move up and down in the slots. The heating device 9 rises by the lifting device 11. When the lifting device 11 is lowered, the heating device 9 moves downward by gravity until it reaches the bottom of the slot; the first protective plate 1 and the second protective plate 5 are both ≥ 15mm manganese steel or carbon steel; the first protective plate 1 and the second protective plate 5 are respectively provided with grooves 6 on the facing surfaces, in which the first insulating layer 2, the graphene heating layer 3 and the second insulating layer 4 are arranged, and a third insulating layer is arranged between the upper metal heat conducting plate, the lower metal heat conducting plate and the graphene heating layer 3, and the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element pass through the third insulating layer, the upper and lower metal heat conducting plates (through holes 8) to connect the control system; a groove 6 with a depth of ≤8mm is milled at a distance of ≥20mm from the edges of the upper and lower metal heat conducting plates; a semi-through hole A 8-1 and a semi-through hole B 8-2 are respectively arranged on the side walls of the groove 6 of the first protective plate 1 and the second protective plate 5, which together form a through hole 8, and a total of two through holes 8 are arranged, and the two ends of the heating device 9 (i.e., the two ends of the first protective plate 1 and the second protective plate 5) are respectively arranged to facilitate the passage of the wires; wire holes are drilled around the edges of the first protective plate 1 and the second protective plate 5, the first protective plate 1 is covered on the second protective plate 5, and then fixed with high-strength bolts.

[0037] The first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 1MΩ / kV and a high temperature resistance of more than 300°C. 2 It is arranged that the insulating glue used in the third insulating layer is the same as the insulating glue used in the first insulating layer 2 .

[0038] When the first protective plate 1 and the second protective plate 5 are combined, a cavity structure is formed, in which the first insulating layer 2, the second insulating layer 4, the graphene heating layer 3 and the third insulating layer are arranged, and the through hole 8 is connected to the cavity structure. The wire connected to the graphene heating layer 3 and the wire connected to the temperature measuring element pass through the third insulating layer, the upper and lower metal heat conducting plates (through hole 8) to connect to the control system. Two through holes 8 can be set, respectively set at the two ends of the heating device 9, to facilitate the wire to pass through.

[0039] When one through hole 8 is provided, the through hole 8 is provided at one end of the heating device 9, and a half groove A 7-1 and a half groove B 7-2 are provided on the side walls of the groove 6 of the first protection plate 1 and the second protection plate 5, respectively. Figure 2As shown, together they constitute a preset wire groove 7, in which the wires connected to the graphene heating layer 3 and the wires connected to the temperature measuring element are arranged, the preset wire groove 7 is connected to the through hole 8, and the wire connected at one end away from the through hole 8 can go around the preset wire groove 7 and pass through the through hole 8 to connect to the control system, which can facilitate the connection of the control system and effectively avoid accidents.

[0040] The gap between the first protection plate 1 and the second protection plate 5 is sealed with a sealant.

[0041] Embodiment 3:

[0042] A hot press heating device 9:

[0043] The first protection plate 1 is an upper metal heat conducting plate, and the second protection plate 5 is a lower metal heat conducting plate. The thickness of the upper and lower metal heat conducting plates is 15 mm, the width is 1400 mm, and the length is 2600 mm. Carbon steel, 20 mm away from the edges of the upper and lower metal heat conducting plates, a groove 6 with a depth of 5 mm is milled, and the graphene heating layer 3 is a graphene crystal with a particle size of ≤3 microns and a purity of ≥98% is evenly coated on the insulating layer, with a density of 100 g / m 2 Uniform coating; the first insulating layer 2 and the second insulating layer 4 are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV, high temperature resistance above 300℃, and 100g / m 2 The third insulating layer is coated evenly, and the insulating glue used in the third insulating layer is the same as the insulating glue used in the first insulating layer; three temperature measuring elements (thermocouples, temperature sensors) are set, and through holes 8 are set at both ends of the heating device 9.

[0044] The present invention provides a forming process for artificial boards, which uses graphene materials to generate electricity and heat instead of traditional heating methods, thus avoiding the generation of CO, CO2, NO SThe invention can generate heat instantly, effectively improve work efficiency and increase production capacity; no full-time technicians are required to maintain the boiler, and no heat transfer oil is required to be replaced and replenished regularly, which improves efficiency and saves manpower and material resources; in particular, in recent years, the country has vigorously developed green electricity, electricity prices have fallen, and natural gas prices have risen every year. The use of the heat press of the invention can save more than 35% of costs; since boilers, pressure pipes and natural gas are not used, safety hazards are eliminated and the risk factor is reduced; compared with the traditional heat transfer oil, resistance wire, and heating pipe heat supply mode, the heating speed is increased, the heat conversion efficiency is increased, the cost is reduced, the service life is increased, the production efficiency is increased, the occurrence of safety accidents is avoided, the safety factor is increased, and it is conducive to industrialized production; the heating device 9 can be manufactured in different specifications (such as 4×8 feet, 4×9 feet, 5×8 feet) according to needs; the heating device 9 used in the heat press has been tested for 3000 hours continuously, and the equipment operates normally and has a long service life.

[0045] The present invention provides a forming process for artificial boards, which uses a graphene material to generate heat by electricity to provide heat for the forming of the artificial boards. The process has fast heating speed, high heat utilization rate, low energy consumption, safety, environmental protection and energy saving. It can fundamentally solve the current situation of high energy consumption, high pollution and high safety risks in the artificial board production industry, and can be used for industrial production applications.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0047] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A forming process of an artificial board, wherein the forming process mainly comprises: heating and pressurizing a multi-layer blank under the action of an adhesive, It is characterized in that The heating method is to provide heat by applying electricity to the graphene material to generate heat, and the graphene material is a graphene crystal or a graphene filament bundle.

2. A forming process for an artificial board according to claim 1, It is characterized in that The graphene has a crystal particle size of ≤3 microns and a purity of ≥98%.

3. A forming process for an artificial board according to claim 1, It is characterized in that The graphene material is 100 to 300 g / m 2 set up.

4. A forming process for an artificial board according to claim 1, It is characterized in that The specific equipment used in the graphene material heating method by applying electricity is a hot press heating device (9), the heating device (9) is arranged on the hot press, and the heating device (9) comprises a first protective plate (1), a first insulating layer (2), a graphene heating layer (3), a second insulating layer (4), and a second protective plate (5) in sequence; the two ends of the graphene heating layer (3) are connected to the control system through wires; a temperature measuring element is arranged on the graphene heating layer (3), and the temperature measuring element is connected to the control system through wires.

5. A forming process for an artificial board according to claim 1, It is characterized in that The first insulating layer (2) and the second insulating layer (4) are both made of insulating glue, with an insulation resistance of 0.5MΩ / kV to 1MΩ / kV, high temperature resistance of more than 300°C, and a strength of 100 to 300g / m 2 set up.

6. A forming process for an artificial board according to claim 1, It is characterized in that The first protection plate (1) and the second protection plate (5) are both made of metal heat-conducting materials.

7. A forming process for an artificial board according to claim 6, It is characterized in that The thickness of the first protective plate (1) and the second protective plate (5) are both ≥15 mm.

8. A forming process for an artificial board according to claim 1, It is characterized in that The first protective plate (1) and the second protective plate (5) are respectively provided with grooves (6) on their facing surfaces, and the first insulating layer (2), the graphene heating layer (3) and the second insulating layer (4) are arranged in the grooves (6); semi-through holes are respectively arranged on the side walls of the grooves (6) of the first protective plate (1) and the second protective plate (5), which together form a through hole (8); and the first protective plate (1) and the second protective plate (5) are connected.

9. A forming process for an artificial board according to claim 8, It is characterized in that A third insulating layer is provided between the first protective plate (1), the second protective plate (5) and the graphene heating layer (3).

10. A forming process for an artificial board according to claim 8, It is characterized in that When the through hole (8) is only provided at one end of the heating device (9), half grooves are respectively provided on the side walls of the grooves (6) of the first protective plate (1) and the second protective plate (5), together forming a preset wire groove (7), and the preset wire groove (7) is connected to the through hole (8).

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