Production process of high-temperature-resistant repeatedly-recycled hot-pressed paper

Abstract

The invention relates to the technical field of hot-pressed paper production processes, and discloses a high-temperature-resistant repeatedly-recycled hot-pressed paper production process which comprises the following steps: S1, crushing a pulp board; s2, separating by a fiber separator; s3, filtering coarse pulp; s4, pulping and grinding; s5, slurry flowing and forming; s6, secondary forming is conducted; and S7, rolling and packaging. According to the production process of the high-temperature-resistant repeatedly-recycled hot-pressed paper, the raw pulp of the hot-pressed paper and the paper forming waste leftover materials are repeatedly recycled in the production process of the hot-pressed paper; the recycled mixed pulp is sequentially added into different production steps of the hot-pressed paper according to different concentrations in a manner of filtering, multi-time residue removal and water replenishing dilution, so that the mixing property of the production raw pulp of the hot-pressed paper is better, the toughness of the formed hot-pressed paper is improved, the multi-time recycling capability of the hot-pressed paper is improved, and the production cost is reduced. Not only is the production cost reduced, but also the overall quality of a hot-pressed paper product can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot-pressed paper production technology, in particular to a high-temperature resistant and multi-cycle hot-pressed paper production technology. Background Art

[0002] Hot-pressed paper is a new type of electronic component that can be bent arbitrarily, has stable performance, and is easy to use. It is mainly used in the electronics and electrical industries, such as the connection between liquid crystal display devices, circuit boards and circuit boards, circuit boards and solar panels, etc. The connection is achieved through hot pressing without the need for traditional welding technology.

[0003] In the prior art, when hot-pressed paper is produced, the paper is generally fed into a hot press in a wet state and placed on a heating plate. After the heating plate reaches a certain temperature, pressure is applied and maintained for a period of time. Finally, the pressure is released and the paper is transported to a cooling plate for cooling, so that the fibers are arranged more closely to ensure the tensile properties and use quality of the hot-pressed paper.

[0004] However, in the existing hot-pressed paper production process, the base paper is usually prepared with only one layer of pulp. In the subsequent process, the toughness of the hot-pressed paper itself is limited by the strength of the base paper. Without adding other materials, its durability is poor and it is difficult to reuse multiple times, which reduces the use effect of the hot-pressed paper. In view of this, we propose a high-temperature resistant and multiple-recyclable hot-pressed paper production process. Summary of the invention

[0005] The object of the present invention is to provide a production process for high temperature resistant and multi-cycle hot pressing paper to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a production process of high temperature resistant multiple cycle hot pressing paper, comprising the following steps: S1. Pulp sheet crushing: the pulp sheet is put into a pulper for crushing to obtain a fibrous slurry, and the fibrous slurry is introduced into a No. 1 pulp tank; S2, fiber separator separation: The fibrous slurry in the pulp pool in S1 is introduced into the fiber separator by a delivery pump, the coarse pulp discharged from the fiber separator enters the No. 2 pulp pool, and the filtrate discharged from the fiber separator is discharged into the No. 3 pulp pool; S3, crude pulp filtration: The crude pulp in the No. 2 pulp pool is introduced into the upflow pressure screen by a delivery pump for filtration; S31, the light slag from the upflow pressure screen is discharged to the tailings inclined screen for secondary filtration, the sediment obtained from the secondary filtration is discharged into the No. 3 pulp pool, and the slurry obtained from the secondary filtration is treated by the white water microfiltration machine and then returned to the No. 2 pulp pool for reuse; S32, the heavy sediment of the upflow pressure screen is directly discharged into the No. 3 pulp pool, and the solid-liquid mixture in the No. 3 pulp pool is transported to the conical refiner by a delivery pump to obtain recovered pulp, which is then led into the pulp mixing box, and the recovered pulp in the pulp mixing box is separated into solid and liquid by a tailings separator, and finally the tailings are discharged and separated, and the pulp is returned to the No. 2 pulp pool for reuse; S33, the filtrate of the upflow pressure screen is screened twice by a large inclined screen, the solid screened product of the large inclined screen is treated by a white water microfilter and then returned to the No. 2 pulp pool for reuse, and the filtrate after the second screening by the large inclined screen is transported to the No. 4 pulp pool; S4, beating and grinding: the slurry in the No. 4 pulp pool is pumped out to the double-disc pulping machine by a delivery pump for beating and high-efficiency grinding, and the mixed slurry is finally discharged to the No. 5 pulp pool, and the mixed slurry in the No. 5 pulp pool is transported to the No. 6 pulp pool by a delivery pump for standby; S5, slurry flow forming: Use a slurry pump to transport the mixed slurry in the No. 6 slurry pool to the mixed sand removal equipment to remove impurities and slag in the mixed slurry. The mixed slurry is screened by a pressure screen and then enters the slurry flow box, and the formed hot-pressed paper primary product is produced through a forming board; S6, secondary molding: placing the hot pressed paper product formed in S5 into a vacuum box, and performing secondary molding processing on the hot pressed paper product through auxiliary processing equipment in the vacuum box to obtain a hot pressed paper finished product; S7, winding and packaging: winding and rewinding the finished hot-pressed paper obtained in S6, packaging, and storing after passing the inspection.

[0007] Preferably, the mixed desandering equipment in S5 comprises a first stage desander, a first stage slurry tank, a second stage desander, a second stage slurry tank and a third stage desander, and the mixed desandering equipment further comprises the following operating steps: S51, the slurry pump extracts the mixed slurry and transports it to the first stage desander for desanding and filtration. The trapped sand is discharged into the first stage slurry tank, and the filtered slurry is transported to the pressure screen for subsequent processing; S52, the sand in the first stage slurry tank is transported to the second stage desander for secondary desanding, the sand obtained from the secondary desanding is discharged into the second stage slurry tank, and the filtrate produced in the secondary desanding is returned to the input port of the slurry pump for reuse; S53, the sand in the second stage slurry tank is transported to the third stage desander for three desanding operations, and the sediment obtained from the three desanding operations is directly discharged as waste for collection and treatment, and the filtrate produced by the three desanding operations is discharged into the first stage slurry tank and the second stage slurry tank to repeat S52 and S53.

[0008] Preferably, the solid residue after screening by the pressure screen in S5 is vibrated by the vibrating frame screen and then discharged by a water spray device, and collected and processed as waste. When in use, the flow box needs to add defoaming water in proportion to remove bubbles in the mixed slurry, so as to avoid the appearance of smaller bubbles inside the hot pressed paper during forming, which affects the forming quality of the hot pressed paper.

[0009] Preferably, the vacuum box in S6 includes a watermark roller, a vacuum couch roller, a pressing component, a water needle, and a drying component, and the auxiliary processing equipment includes the following steps when performing secondary molding processing on the primary product of hot pressed paper: S61, firstly, use a watermark roller to wash the forming chopping board and the hot-pressed paper primary product formed on the forming chopping board, and discharge the washing liquid into the net washing pool; S62, placing the washed hot-pressed paper product into a vacuum box, and evacuating the vacuum box; S63, using a vacuum roller to dehydrate the hot pressed paper product in the vacuum box, using vacuum suction to remove moisture from the wet paper sheets to increase the dryness of the wet paper sheets, and using a water needle to cut and trim the edges of the hot pressed paper product to ensure the neatness and quality of the paper, thereby reducing pulp loss and improving the efficiency and quality of papermaking production; S64, the wet paper sheets are pressed by the pressing components in the vacuum box to discharge the moisture therein, and finally the pressed wet paper sheets are dried by the drying components to finally obtain the finished hot pressed paper products.

[0010] Preferably, the water discharged after washing, water needle cutting and pressing in S61, S63 and S64 is discharged into a screen washing pool for collection, and the screen washing pool transports the water to a white water tower through a pulping pump to form recycled water for reuse. At the same time, the evaporated water discharged from the drying component in S64 is directly discharged into the air, and the folded loss formed on the edge of the paper after water needle cutting in S63 and the pressure loss formed on the edge of the paper after pressing in S64 are collected and discharged into a folded loss pool, and the edge loss of the paper in the folded loss pool is added with water and transported to the No. 5 mixed pulp pool through a conveying pump to perform step S5, thereby recycling and reusing the scraps generated in the paper forming and processing process, improving the utilization rate of raw materials, reducing costs and increasing efficiency.

[0011] Preferably, the solid residual mixed liquid produced by the white water microfiltration machine in S33 is discharged into the white water tower and mixed with the recycled water in the white water tower, and the recycled water in the white water tower is separated into solid and liquid by using an air flotation machine, and finally impurities are filtered out, and the filtered water is output to the purification water tower for standby use, and the filtered water in the purification water tower is pumped out to the white water tower by pump No. 1 to dilute the water-liquid mixture in the white water tower. The purification water tower also supplies water to the fiber separator in S2, the tailings separator and the pulp mixing box in S32, the double-disc refiner and the fifth pulp pool in S4, the first-stage slag trough, the second-stage slag trough and the third-stage desander in S5, as well as the vibrating frame screen and the damage pool, thereby ensuring the water recycling in the entire hot pressing paper production process and saving water resources.

[0012] Preferably, the white water tower extracts the recovered water through the No. 2 pump and conveys it to the broken paper pulper, and the broken paper pulper also includes the dry damaged paper and paper edge materials generated when the hot pressed paper product is rolled and rewound in S7, the dry damaged paper and paper edge materials are mixed with the recovered water extracted from the white water tower by the broken paper pulper to obtain damaged paper pulp, and the damaged paper pulp is conveyed to the pulper in S1 by the conveying pump, and the step S1 is performed again, so as to recycle the scraps after the hot pressed paper is formed and the consumable materials generated in the rolling process, thereby reducing the loss of materials and increasing the output of hot pressed paper.

[0013] Preferably, the No. 2 pump transports the recycled water to the No. 1 pulp pool while extracting the recycled water in the white water tower, so as to replenish the No. 1 pulp pool with water and transport the recycled water with residues from hot-pressed paper production to the hot-pressed paper production line again, so as to achieve the purpose of reuse, reduce raw material loss during hot-pressed paper production, and improve production efficiency.

[0014] Preferably, when the No. 2 pump extracts the recycled water in the white water tower and transports it to the No. 1 pulp pool, the delivery pipeline is connected to the concentrated white water tank through a tee pipe and an external pipeline, and a drain outlet is provided at the bottom of the concentrated white water tank, and the drain outlet is connected to the No. 6 pulp pool, and after S4 and before executing S5, the mixed liquid in the No. 5 pulp pool first flows into the No. 6 pulp pool and is mixed with the recycled water in the concentrated white water tank to obtain a mixed slurry, and the mixed slurry is transported to the mixing and desanding equipment through a slurry flushing pump to perform slag discharge operations.

[0015] Preferably, an overflow port is provided at the top of the concentrated white water tank, and the overflow port is connected to the feed port of the white water microfilter in S33 through a pipeline, so as to replenish the white water microfilter and re-filter the recycled water of the overflow part, and the slurry finally obtained is returned to the No. 2 slurry pool, and then the S3 step is executed, so that the recycled water extracted from the white water tower can be diverted into different production steps of hot-pressed paper, which can not only replenish the raw materials in each step, but also reduce the loss of water resources and raw materials for hot-pressed paper production, reduce production costs, and improve the production efficiency of hot-pressed paper.

[0016] Compared with the prior art, the present invention provides a high temperature resistant multiple cycle hot pressing paper production process, which has the following beneficial effects:

[0017] 1. The high-temperature resistant multiple-recycling hot-pressed paper production process recycles the original pulp of hot-pressed paper and waste scraps of paper forming for multiple times in the production process of hot-pressed paper, and adds the recycled mixed pulp into the production steps of hot-pressed paper at different progresses in sequence according to different concentrations by filtering, multiple times of slag removal and water dilution, so as to make the production pulp of hot-pressed paper more mixed, thereby improving the toughness of the hot-pressed paper after forming and improving its ability to be recycled multiple times, which not only reduces the production cost, but also improves the overall quality of the hot-pressed paper products.

[0018] 2. The high temperature resistant multiple cycle hot pressed paper production process, after the hot pressed paper is initially formed, uses a vacuum roller, a pressing component, a drying component and other structures to dehydrate the hot pressed paper product in a vacuum box, which can not only ensure the dehumidification effect of the hot pressed paper, but also improve the overall forming state of the hot pressed paper without being affected, so as to ensure the production quality of the hot pressed paper products.

[0019] 3. The high-temperature resistant multiple-cycle hot-pressed paper production process uses an air flotation machine to remove impurities and filter the recycled water in the white water tower, and transports it to the purification water tower for sedimentation, so that the purified water in the purification water tower can participate in the entire production process of hot-pressed paper, supply water to equipment such as fiber separators and tailings separators, complete the water recycling in the entire hot-pressed paper production process, reduce costs and increase efficiency, and improve the utilization rate of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the production process of hot pressed paper of the present invention. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, the present invention provides a technical solution: a production process of high temperature resistant multiple cycle hot pressing paper, comprising the following steps: S1. Pulp sheet crushing: the pulp sheet is put into a pulper for crushing to obtain a fibrous slurry, and the fibrous slurry is introduced into a No. 1 pulp tank; S2, fiber separator separation: The fibrous slurry in the pulp pool in S1 is introduced into the fiber separator by a delivery pump, the coarse pulp discharged from the fiber separator enters the No. 2 pulp pool, and the filtrate discharged from the fiber separator is discharged into the No. 3 pulp pool; S3, crude pulp filtration: The crude pulp in the No. 2 pulp pool is introduced into the upflow pressure screen by a delivery pump for filtration; S31, the light slag from the upflow pressure screen is discharged to the tailings inclined screen for secondary filtration, the sediment obtained from the secondary filtration is discharged into the No. 3 pulp pool, and the slurry obtained from the secondary filtration is treated by the white water microfiltration machine and then returned to the No. 2 pulp pool for reuse; S32, the heavy sediment of the upflow pressure screen is directly discharged into the No. 3 pulp pool, and the solid-liquid mixture in the No. 3 pulp pool is transported to the conical refiner by a delivery pump to obtain recovered pulp, which is then led into the pulp mixing box, and the recovered pulp in the pulp mixing box is separated into solid and liquid by a tailings separator, and finally the tailings are discharged and separated, and the pulp is returned to the No. 2 pulp pool for reuse; S33, the filtrate of the upflow pressure screen is screened twice by a large inclined screen, the solid screened product of the large inclined screen is treated by a white water microfilter and then returned to the No. 2 pulp pool for reuse, and the filtrate after the second screening by the large inclined screen is transported to the No. 4 pulp pool; S4, beating and grinding: the slurry in the No. 4 pulp pool is pumped out to the double-disc pulping machine by a delivery pump for beating and high-efficiency grinding, and the mixed slurry is finally discharged to the No. 5 pulp pool, and the mixed slurry in the No. 5 pulp pool is transported to the No. 6 pulp pool by a delivery pump for standby; S5, slurry flow forming: Use a slurry pump to transport the mixed slurry in the No. 6 slurry pool to the mixed sand removal equipment to remove impurities and slag in the mixed slurry. The mixed slurry is screened by a pressure screen and then enters the slurry flow box, and the formed hot-pressed paper primary product is produced through a forming board; The mixed desandering equipment in S5 includes a first stage desander, a first stage slurry tank, a second stage desander, a second stage slurry tank and a third stage desander, and the mixed desandering equipment also includes the following operation steps: S51, the slurry pump extracts the mixed slurry and transports it to the first stage desander for desanding and filtration. The trapped sand is discharged into the first stage slurry tank, and the filtered slurry is transported to the pressure screen for subsequent processing; S52, the sand in the first stage slurry tank is transported to the second stage desander for secondary desanding, the sand obtained from the secondary desanding is discharged into the second stage slurry tank, and the filtrate produced in the secondary desanding is returned to the input port of the slurry pump for reuse; S53, the sand in the second stage slurry tank is transported to the third stage desander for three desanding operations, the sediment obtained from the three desanding operations is directly discharged as waste for collection and treatment, and the filtrate produced by the three desanding operations is discharged to the first stage slurry tank and the second stage slurry tank to repeat S52 and S53; S6, secondary molding: placing the hot pressed paper product formed in S5 into a vacuum box, and performing secondary molding processing on the hot pressed paper product through auxiliary processing equipment in the vacuum box to obtain a hot pressed paper finished product; The vacuum box in S6 includes a watermark roller, a vacuum roller, a pressing component, a water needle, and a drying component, and the auxiliary processing equipment includes the following steps when performing secondary molding processing on the primary product of hot pressed paper: S61, firstly, use a watermark roller to wash the forming chopping board and the hot-pressed paper primary product formed on the forming chopping board, and discharge the washing liquid into the net washing pool; S62, placing the washed hot-pressed paper product into a vacuum box, and evacuating the vacuum box; S63, using a vacuum roller to dehydrate the hot pressed paper product in the vacuum box, using vacuum suction to remove moisture from the wet paper sheets to increase the dryness of the wet paper sheets, and using a water needle to cut and trim the edges of the hot pressed paper product to ensure the neatness and quality of the paper, thereby reducing pulp loss and improving the efficiency and quality of papermaking production; S64, pressing the wet paper sheets with a pressing component in a vacuum box to discharge the moisture therein, and finally drying the pressed wet paper sheets with a drying component to obtain a hot pressed paper product; S7, winding and packaging: winding and rewinding the finished hot-pressed paper obtained in S6, packaging, and storing after passing the inspection.

[0022] In one embodiment of the present invention, the solid residue after screening by the pressure screen in S5 is vibrated by the vibrating frame screen and then discharged by the water spray device, and collected and processed as waste. When the headbox is used, defoaming water needs to be added in proportion to remove the bubbles in the mixed slurry to avoid the appearance of small bubbles inside during hot-pressed paper forming, which affects the forming quality of the hot-pressed paper. At the same time, the water discharged after washing, water needle cutting and squeezing in S61, S63 and S64 is discharged into the screen washing pool for collection, and the screen washing pool is passed through The flushing pump transports water to the white water tower to form recycled water for reuse. At the same time, the evaporated water discharged from the drying component in S64 is directly discharged into the air. The paper edge loss formed after water needle cutting in S63 and the pressure loss formed on the paper edge after pressing in S64 are collected and discharged into the loss pool. The paper edge loss material in the loss pool is added with water and transported to the No. 5 mixed pulp pool through the delivery pump to perform step S5, thereby recycling and reusing the scraps generated during paper forming and processing, improving the utilization rate of raw materials, reducing costs and increasing efficiency.

[0023] Furthermore, the solid residual mixed liquid produced by the white water microfiltration machine in S33 is discharged into the white water tower and mixed with the recycled water in the white water tower. The recycled water in the white water tower is separated into solid and liquid by using an air flotation machine, and finally impurities are filtered out, and the filtered water is output to the purification water tower for standby use, and the filtered water in the purification water tower is pumped out to the white water tower by pump No. 1 to dilute the water-liquid mixture in the white water tower. The purification water tower also supplies water to the fiber separator in S2, the tailings separator and the pulp mixing box in S32, the double-disc refiner and the No. 5 pulp pool in S4, the first-stage slag trough, the second-stage slag trough and the third-stage desander in S5, as well as the vibrating frame screen and the damage pool, thereby ensuring the water recycling in the entire hot pressing paper production process and saving water resources.

[0024] In addition, the white water tower extracts the recycled water through the No. 2 pump and conveys it to the damaged paper pulper, and the damaged paper pulper also includes the dry damaged and paper edge materials generated when the hot pressed paper finished product is rolled and rewound in S7. The dry damaged and paper edge materials are mixed with the recycled water extracted from the white water tower through the damaged paper pulper to obtain damaged paper pulp, and the damaged paper pulp is conveyed to the pulper in S1 through the conveying pump, and the S1 step is performed again, so as to recycle the scraps after the hot pressed paper is formed and the consumable materials generated during the rolling operation, reduce the loss of materials, and increase the output of hot pressed paper. In addition, the No. 2 pump conveys the recycled water to the No. 1 pulp pool while extracting the recycled water in the white water tower, so as to replenish the No. 1 pulp pool with water, and convey the recycled water with hot pressed paper production residue to the hot pressed paper production line again, so as to achieve the purpose of reuse, reduce the loss of raw materials during the production of hot pressed paper, and improve production efficiency.

[0025] In an embodiment of the present invention, when the No. 2 pump extracts the recycled water in the white water tower and transports it to the No. 1 pulp pool, the transport pipeline is connected to the concentrated white water tank through a tee pipe and an external pipeline, and a drain outlet is provided at the bottom of the concentrated white water tank, and the drain outlet is connected to the No. 6 pulp pool, and before executing S5 after S4, the mixed liquid in the No. 5 pulp pool first flows into the No. 6 pulp pool and is mixed with the recycled water in the concentrated white water tank to obtain a mixed slurry, and the mixed slurry is transported to the mixing and desanding equipment through a slurry pump to perform slag discharge operations.

[0026] In the present invention, an overflow port is provided on the top of the concentrated white water tank, and the overflow port is connected to the feed port of the white water microfilter in S33 through a pipeline, so as to replenish the white water microfilter and re-filter the recycled water of the overflow part, and the slurry finally obtained is returned to the No. 2 slurry pool, and then the S3 step is executed, so that the recycled water extracted from the white water tower can be diverted into different production steps of hot-pressed paper, which can not only replenish the raw materials in each step, but also reduce the loss of water resources and raw materials for hot-pressed paper production, reduce production costs, and improve the production efficiency of hot-pressed paper.

[0027] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A production process for high temperature resistant multiple cycle hot pressing paper, characterized by: The following steps are involved: S1. Pulp sheet crushing: the pulp sheet is put into a pulper for crushing to obtain a fibrous slurry, and the fibrous slurry is introduced into a No. 1 pulp tank; S2, fiber separator separation: The fibrous slurry in the pulp pool in S1 is introduced into the fiber separator by a delivery pump, the coarse pulp discharged from the fiber separator enters the No. 2 pulp pool, and the filtrate discharged from the fiber separator is discharged into the No. 3 pulp pool; S3, coarse pulp filtration: the coarse pulp in the second pulp pool is introduced into the upflow pressure screen by a delivery pump for filtration; S31, the light slag from the upflow pressure screen is discharged to the tailings inclined screen for secondary filtration, the sediment obtained from the secondary filtration is discharged into the No. 3 pulp pool, and the slurry obtained from the secondary filtration is treated by the white water microfiltration machine and then returned to the No. 2 pulp pool for reuse; S32, the heavy sediment of the upflow pressure screen is directly discharged into the No. 3 pulp pool, and the solid-liquid mixture in the No. 3 pulp pool is transported to the conical refiner by a delivery pump to obtain recovered pulp, which is then led into the pulp mixing box, and the recovered pulp in the pulp mixing box is separated into solid and liquid by a tailings separator, and finally the tailings are discharged and separated, and the pulp is returned to the No. 2 pulp pool for reuse; S33, the filtrate of the upflow pressure screen is screened twice by a large inclined screen, the solid screened product of the large inclined screen is treated by a white water microfilter and then returned to the No. 2 pulp pool for reuse, and the filtrate after the second screening by the large inclined screen is transported to the No. 4 pulp pool; S4, beating and grinding: the slurry in the No. 4 pulp pool is pumped out to the double-disc pulping machine by a delivery pump for beating and high-efficiency grinding, and the mixed slurry is finally discharged to the No. 5 pulp pool, and the mixed slurry in the No. 5 pulp pool is transported to the No. 6 pulp pool by a delivery pump for standby; S5, slurry flow forming: Use a slurry pump to transport the mixed slurry in the No. 6 slurry pool to the mixed sand removal equipment to remove impurities and slag in the mixed slurry. The mixed slurry is screened by a pressure screen and then enters the slurry flow box, and the formed hot-pressed paper primary product is produced through a forming board; S6, secondary molding: placing the hot pressed paper product formed in S5 into a vacuum box, and performing secondary molding processing on the hot pressed paper product through auxiliary processing equipment in the vacuum box to obtain a hot pressed paper finished product; S7, winding and packaging: winding and rewinding the finished hot-pressed paper obtained in S6, packaging, and storing after passing the inspection.

2. The high temperature resistant multiple cycle hot pressing paper production process according to claim 1, characterized in that: The mixed desandering equipment in S5 includes a first-stage desander, a first-stage slurry tank, a second-stage desander, a second-stage slurry tank and a third-stage desander, and the mixed desandering equipment also includes the following operating steps: S51, the slurry pump extracts the mixed slurry and transports it to the first stage desander for desanding and filtration. The trapped sand is discharged into the first stage slurry tank, and the filtered slurry is transported to the pressure screen for subsequent processing; S52, the sand in the first stage slurry tank is transported to the second stage desander for secondary desanding, the sand obtained from the secondary desanding is discharged into the second stage slurry tank, and the filtrate produced in the secondary desanding is returned to the input port of the slurry pump for reuse; S53, the sand in the second stage slurry tank is transported to the third stage desander for three desanding operations, and the sediment obtained from the three desanding operations is directly discharged as waste for collection and treatment, and the filtrate produced by the three desanding operations is discharged into the first stage slurry tank and the second stage slurry tank to repeat S52 and S53.

3. The high temperature resistant multiple cycle hot pressing paper production process according to claim 2, characterized in that: The solid residue after screening by the pressure screen in S5 is vibrated by the vibrating frame screen and then discharged by a water spray device and collected and processed as waste. The headbox needs to be added with defoaming water in proportion when in use.

4. The high temperature resistant multiple cycle hot pressing paper production process according to claim 3, characterized in that: The vacuum box in S6 includes a watermark roller, a vacuum couch roller, a pressing component, a water needle, and a drying component, and the auxiliary processing equipment includes the following steps when performing secondary molding processing on the primary product of hot pressed paper: S61, firstly, use a watermark roller to wash the forming chopping board and the hot-pressed paper primary product formed on the forming chopping board, and discharge the washing liquid into the net washing pool; S62, placing the washed hot-pressed paper product into a vacuum box, and evacuating the vacuum box; S63, using a vacuum roller to dehydrate the hot pressed paper product in the vacuum box, using vacuum suction to remove moisture from the wet paper sheets to increase the dryness of the wet paper sheets, and using a water needle to cut and trim the edges of the hot pressed paper product; S64, the wet paper sheets are pressed by the pressing components in the vacuum box to discharge the moisture therein, and finally the pressed wet paper sheets are dried by the drying components to finally obtain the finished hot pressed paper products.

5. The high temperature resistant multiple cycle hot pressing paper production process according to claim 4, characterized in that: The water discharged after washing, water needle cutting and pressing in S61, S63 and S64 is discharged into the screen washing pool for collection, and the screen washing pool transports the water to the white water tower through the pulp flushing pump to form recycled water for reuse. At the same time, the evaporated water discharged from the drying component in S64 is directly discharged into the air. The ridge loss formed on the edge of the paper after water needle cutting in S63 and the pressure loss formed on the edge of the paper after pressing in S64 are collected and discharged into the ridge loss pool. The edge loss material of the paper in the ridge loss pool is added with water and transported to the No. 5 mixed pulp pool through a delivery pump to execute step S5.

6. The high temperature resistant multiple cycle hot pressing paper production process according to claim 5, characterized in that: The solid residual mixed liquid produced by the white water microfiltration machine in S33 is discharged into the white water tower and mixed with the recycled water in the white water tower. The recycled water in the white water tower is separated into solid and liquid by a flotation machine, and finally impurities are filtered out. The filtered water is output to the purification water tower for standby use, and the filtered water in the purification water tower is pumped out to the white water tower by pump No. 1 to dilute the water-liquid mixture in the white water tower. The purification water tower also supplies water to the fiber separator in S2, the tailings separator and the pulp mixing box in S32, the double-disc refiner and the fifth pulp pool in S4, the first-stage slag pulp tank, the second-stage slag pulp tank and the third-stage desander in S5, as well as the vibrating frame screen and the damage pool.

7. The high temperature resistant multiple cycle hot pressing paper production process according to claim 6, characterized in that: The white water tower extracts the recovered water through the No. 2 pump and conveys it to the broken paper pulper, and the broken paper pulper also includes the dry damaged paper and paper edge materials generated when the hot pressed paper product is rolled up and rewound in S7. The dry damaged paper and paper edge materials are mixed with the recovered water extracted from the white water tower through the broken paper pulper to obtain broken paper pulp liquid, and the broken paper pulp liquid is conveyed to the pulper in S1 through the conveying pump, and step S1 is performed again.

8. The high temperature resistant multiple cycle hot pressing paper production process according to claim 7, characterized in that: The No. 2 pump pumps out the recovered water in the white water tower while also delivering the recovered water to the No. 1 pulp pool.

9. The high temperature resistant multiple cycle hot pressing paper production process according to claim 8, characterized in that: When the No. 2 pump extracts the recycled water in the white water tower and transports it to the No. 1 pulp pool, the transport pipeline is connected to the concentrated white water tank through the tee pipe and the external pipeline, and a drain port is opened at the bottom of the concentrated white water tank, and the drain port is connected to the No. 6 pulp pool, and after S4 and before executing S5, the mixed liquid in the No. 5 pulp pool first flows into the No. 6 pulp pool and is mixed with the recycled water in the concentrated white water tank to obtain a mixed slurry, and the mixed slurry is transported to the mixing and desanding equipment through the slurry flushing pump to perform slag discharge operations.

10. The high temperature resistant multiple cycle hot pressing paper production process according to claim 9, characterized in that: An overflow port is provided at the top of the concentrated white water tank, and the overflow port is connected to the feed port of the white water microfilter in S33 through a pipeline, and the recycled water of the overflow part is re-filtered, and the final slurry is returned to the No. 2 slurry pool, and then the S3 step is executed.

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