A paper-facer gypsum board forming platform with up-and-down paper synchronization coating and a preparation process thereof

Abstract

This invention provides a paper-faced gypsum board forming platform and its preparation process for simultaneous upper and lower paper coating, belonging to the field of paper-faced gypsum board technology. It includes a lower paper coating platform, with an upper paper coating roller positioned on the conveying path of the lower paper coating platform and facing upwards. A turning roller for adjusting the upper paper conveying direction is located on the side of the upper paper coating roller near the lower paper. An atomizing spray pipe facing inwards from the turning roller and the upper paper coating roller is provided between them. The lower paper coating platform conveys the lower paper and coats it with slurry via the lower paper coating roller on top of the lower paper. During this process, the upper paper is conveyed facing upwards from above the lower paper coated with slurry. After passing through the upper paper coating roller, the contact time between the slurry and the outside is adjusted by a horizontal spacing adjustment mechanism to prevent the slurry from solidifying. While the slurry maintains its viscosity, the direction of the upper paper is adjusted by the turning roller so that the inner side of the upper paper faces downwards and adheres to the lower paper coated with slurry, thereby forming a multifunctional high-density board core paper-faced gypsum board.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a paper-faced gypsum board forming platform for simultaneous coating of upper and lower paper and its preparation process. Background Technology

[0002] Multifunctional high-density fiberboard (HDF) with paper-faced gypsum board is a core material in building decoration and wall partition projects. The molding and coating process directly determines the flatness, thickness uniformity, structural stability, and the production of functional boards. Currently, traditional double-sided gypsum board molding equipment mostly adopts a single-sided coating and passive bonding processing mode. The overall molding process has many structural defects, making it difficult to adapt to the needs of large-scale production of high-quality gypsum board and unable to produce special-form functional boards or lightweight, high-strength boards.

[0003] The following problems were found in the relevant technologies: In existing gypsum board production, during the upper and lower paper coating and forming process, most equipment only performs stable slurry coating on the lower paper. In traditional processes, the upper paper is often transported with its outer side facing the slurry, making the contact time between the slurry and air uncontrollable. This easily leads to premature curing and excessively rapid viscosity decay. The slurry used is also limited to a single type, failing to produce gypsum boards with low areal density and high nail-holding power. Furthermore, the slurry's limited application also prevents differentiation of the core's functional color and the application of various functional slurries. After coating, the inability to accurately control the slurry density results in poor adhesion between the upper and lower papers, voids within the board, and delamination, among other quality defects. Inappropriate gypsum coating slurry leads to difficulties in drying wet gypsum boards, resulting in high HH gypsum content at the interface after drying. To address these issues, this invention proposes a paper-faced gypsum board forming platform and its preparation process for simultaneous upper and lower paper coating.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background section of this application, and therefore may include prior art information that does not constitute prior art information known to those skilled in the art. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art or related technologies, namely, the problems of paper-faced gypsum board coating and its inability to adapt to various coating slurries in the prior art. This invention provides a paper-faced gypsum board forming platform and its preparation process for simultaneous coating of upper and lower paper. By adding an atomization function to the coating slurry before coating, this invention significantly improves the accuracy of the coating layer thickness through a spray coating function, adapts to low-density coating layers, and facilitates adjustment of the gypsum slurry setting time. The specific technical solution is as follows: A paper-faced gypsum board forming platform for simultaneous upper and lower paper coating includes a lower paper coating table. An upper paper coating roller is arranged on the conveying path of the lower paper coating table and is rotatably mounted on the side wall of the lower paper coating table via a bracket. A flipping roller for adjusting the upper paper conveying direction is arranged on the side of the upper paper coating roller near the lower paper. The flipping roller is rotatably mounted on the bracket via a horizontal distance adjustment mechanism for adjusting the curing time difference of the slurry. An atomizing spray pipe facing the inside of the upper paper is arranged between the flipping roller and the upper paper coating roller.

[0006] In the above technical solution, the atomizing spray pipe is connected to the output pump of the gypsum mixer through a conveying pipe. The conveying pipe is equipped with a peristaltic pump to prevent the slurry from solidifying, and the conveying pipe is uniformly equipped with clamp valves located on both sides of the peristaltic pump.

[0007] The horizontal distance adjustment mechanism includes a movable frame that is slidably mounted on the support, a feed screw that is rotatably mounted on the support and parallel to the paper feeding trajectory, and a transmission frame that is threadedly connected to the feed screw is fixed to the side wall of the movable frame. The top of the paper coating table is provided with a directional guide groove parallel to the feed screw, and the bottom of the moving frame is provided with a bottom support slider that is slidably connected to the directional guide groove.

[0008] A transmission roller is rotatably mounted below the paper coating roller and is linked to it, and the transmission roller is rotatably mounted on the support.

[0009] The atomizing spray pipe is connected to the slurry coating channel of the paper coating table.

[0010] A leveling roller fixed on the bracket is provided on the side of the paper feeding roller near the paper feeding roller, and the leveling roller is linked with the paper feeding roller.

[0011] Both the paper coating table and the support are equipped with alignment components that adjust the lateral positions of the paper coating roller and the paper coating roller, respectively.

[0012] The support can be a lifting device, and the lifting end of the lifting device is slidably mounted on the mobile frame.

[0013] The scraper roller is fixed with a baffle at an angle near the side where the paper is fed.

[0014] A manufacturing process for paper-faced gypsum board with simultaneous top and bottom paper coating: S1: Using hemihydrate gypsum plaster as a base, add modified starch, retarder, foaming agent, modifier, and reinforcing agent in proportion. Add one or more of the following as needed: dye, waterproofing agent, formaldehyde decomposition agent, antifungal agent, and hydrophilic aerogel refractory material. Stir evenly to obtain gypsum coating slurry suitable for different functional requirements.

[0015] S2: Calibrate the conveying trajectory of the paper coating table, adjust the linkage speed of the paper coating roller and the drive roller to achieve matching of the paper conveying speed; preset the initial distance between the flipping roller and the paper coating roller through the horizontal distance adjustment mechanism, and calibrate the slurry curing time difference in combination with the production environment temperature and the production line conveying speed; adjust the spraying parameters of the atomizing spray pipe, the roller pressure gap of the scraping roller and the horizontal alignment components of the equipment to ensure the coating alignment accuracy and the standard of slurry spreading thickness.

[0016] S3: Control the paper to be conveyed at a uniform speed along the paper coating table, and use the paper coating roller to uniformly coat the entire surface of the paper and the gypsum board core to complete the paper pre-coating process.

[0017] S4: The paper is conveyed along the preset path to the paper coating roller station. In the gypsum slurry conveying pipeline, a retarder and a small amount of foaming liquid are added. The core of the slurry conveying is the peristaltic pump, which controls the flow rate of the slurry at a frequency of once every 0.5 seconds.

[0018] In the remaining pipeline, a solenoid valve controls the clamp valve to repeatedly clamp the remaining pipeline to prevent clumping and solidification. The pipeline is suspended in the air by an elastic rope, and the conveying pipeline jumps freely under the action of the clamp valve. Then, the paper is conveyed along the preset path to the paper coating roller station. The functional coating slurry is atomized and evenly sprayed onto the inner bonding surface of the paper through the atomizing spray pipe. The paper coating roller and the scraper roller work together to roll and flatten the paper, so as to achieve uniform spreading of the paper slurry in both longitudinal and transverse directions, and complete the precise coating and leveling of the paper.

[0019] S5: The feed screw of the horizontal distance adjustment mechanism drives the moving frame to slide precisely, finely adjust the horizontal distance between the flipping roller and the paper coating roller, accurately control the contact time between the paper coating slurry and the air, match the operating conditions of the production line, and avoid problems such as premature curing of slurry and viscosity failure.

[0020] S6: The paper feeding direction is adjusted by the flipping roller so that the inner side of the upper paper with slurry coating faces down, and it is precisely aligned and tightly bonded with the lower paper that has been coated with slurry, forming a double-layer gypsum board blank.

[0021] S7: The gypsum board blank is naturally cured or assisted with drying and curing to ensure full bonding and fusion of the upper and lower pulp layers with the core. After curing, it is cut, trimmed, and inspected for quality to obtain the finished functional paper-faced gypsum board. Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a flipping roller and a horizontal distance adjustment mechanism, the paper feeding direction can be precisely controlled to achieve stable slurry coating on the inner side of the paper. At the same time, the contact time between the slurry and air is controlled by mechanical distance adjustment to accurately control the slurry curing time difference. The optimal forming conditions are adapted according to the conveying speed and ambient temperature, effectively avoiding problems such as premature curing of the slurry and insufficient viscosity, ensuring the tightness of the upper and lower paper bonding, completely eliminating quality problems such as board delamination and hollowness, and greatly improving the overall structural stability of gypsum board.

[0022] Second, the use of a linkage-type scraper roller to replace the traditional scraper structure, through the full-width rolling and flattening of the paper web on the circumferential surface, achieves uniform spreading of the pulp in both longitudinal and transverse directions, completely solving the defects such as pulp leakage, material accumulation, and thickness stripes caused by scraper vibration, greatly improving the uniformity of the pulp thickness on the paper, and ensuring the flatness and dimensional uniformity of the gypsum board surface.

[0023] Third, the paper feeding and coating rollers operate in sync with the drive rollers to ensure that the paper feeding and coating speeds are matched and uniform, thus avoiding problems such as paper pulling and uneven coating. Attached Figure Description

[0024] Figure 1 This is a front view structural diagram of a paper-faced gypsum board forming platform for simultaneous upper and lower paper coating according to the present invention. Figure 2 This is a top view of a paper-faced gypsum board forming platform for simultaneous upper and lower paper coating according to the present invention. Figure 3 This is a schematic diagram of the structure of the paper coating roller and the turning roller of the present invention; Figure 4 This is a front view of the paper coating roller portion of the present invention. Figure 5 This is a bottom view of the paper coating roller portion of the present invention. Figure 6 This is a schematic diagram of the slurry conveying section of the gypsum mixer of the present invention; in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-lower paper coating table, 2-upper paper coating roller, 3-turning roller, 4-atomizing spray pipe, 5-drive roller, 6-scraping roller, 7-bottom support slider, 8-support, 9-moving frame, 10-feed screw, 11-drive frame, 12-guiding guide groove, 13-conveying pipe, 14-pipe clamp valve, 15-peristaltic pump. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The following are specific implementation cases and appendices. Figure 1-6 The present invention will be further described, but the present invention is not limited to these embodiments.

[0027] A paper-faced gypsum board forming platform for simultaneous upper and lower paper coating includes a lower paper coating table 1. An upper paper coating roller 2 is mounted on the conveying path of the lower paper coating table 1, and is rotatably mounted on the side wall of the lower paper coating table 1 via a bracket 8. The lower paper coating table 1 conveys the lower paper and coats it with slurry on top of the lower paper via the lower paper coating roller. During this process, the upper paper is conveyed facing upwards from above the lower paper to be coated with slurry. Since slurry needs to be applied to the upper paper, the inner side of the upper paper needs to be facing upwards and towards the lower paper direction. A turning roller 3 for adjusting the upper paper conveying direction is provided on the side of the upper paper coating roller 2 near the lower paper. The turning roller 3 is rotatably mounted on the bracket 8 via a horizontal distance adjustment mechanism for adjusting the slurry curing time difference. An atomizing spray pipe 4 is provided between the turning roller 3 and the upper paper coating roller 2, pointing towards the inner side of the upper paper.

[0028] A top frame is fixed on the side wall of the lower paper coating table 1. A main slurry pipe is fixed in the middle of the top frame. Two branch pipes of the main slurry pipe are connected to the spray pipes of the upper paper coating roller 2 and the lower paper coating roller, respectively. Once the slurry of the two upper papers is normally conveyed and delivered to the upper paper, the slurry on the inside of the upper paper will fall off due to gravity. Therefore, the inner side of the upper paper needs to be conveyed upward along the upper paper coating roller 2. After passing the upper paper coating roller 2, the contact time between the slurry and the outside is adjusted by the horizontal distance adjustment mechanism to avoid the slurry solidification.

[0029] While the slurry maintains its viscosity, the orientation of the upper paper is adjusted using the flipping roller 3, ensuring that the inner side of the upper paper faces downwards and adheres to the lower paper coated with slurry, thus forming a double-sided gypsum board. During this process, to control the curing time of the slurry on the inner side of the upper paper, drying or air-drying equipment can be used. Based on the lower paper conveying speed, the conveying speed after slurry coating, and the ambient temperature, the contact time between the slurry at the top of the upper paper and the air is adjusted using the horizontal spacing adjustment mechanism. This time difference ensures contact between the slurry and the gypsum board, guaranteeing the quality of the gypsum board. The atomizing spray pipe 4 is connected to the top frame via a hinged frame for height adjustment, allowing for adjustment of the position of the atomizing spray pipe 4.

[0030] The atomizing spray pipe 4 is connected to the output pump of the gypsum mixer via the conveying pipe 13. A peristaltic pump 15 is installed on the conveying pipe 13 to prevent the slurry from solidifying, and clamp valves 14 are evenly arranged on both sides of the peristaltic pump 15. Both ends of the conveying pipe 13 are sealed and connected to the output pump of the gypsum slurry mixer and the atomizing spray pipe 4, respectively. During the slurry conveying process, the peristaltic pump 15 and the clamp valves 14 control the material delivery through the rubber conveying pipe 13 to prevent solidification of the slurry during transport.

[0031] During the process of drawing slurry from the mixer to the atomizing spray pipe 4, the gypsum slurry will solidify due to the long distance and the reduced conveying pressure and flow rate. We will add a retarder and a small amount of foaming liquid during the drawing process to reduce solidification. In the conveying pipe 13, we add a core device, which is a peristaltic pump 15. The peristaltic pump 15 provides a continuous impact force at a frequency of once every 0.5 seconds and can also stably control the flow rate of the slurry.

[0032] In the remaining pipeline, a solenoid valve is used to control the clamp valve 14 to repeatedly clamp the remaining pipeline to prevent caking and solidification. All pipelines are made of natural silicone tubing and are suspended in the air by elastic ropes to allow them to bounce freely.

[0033] The horizontal distance adjustment mechanism includes a movable frame 9 slidably mounted on a support 8. A feed screw 10, parallel to the paper feeding trajectory, is rotatably mounted on the support 8. A transmission frame 11, threadedly connected to the feed screw 10, is fixed to the side wall of the movable frame 9. The support 8 is fixed on both sides of the paper coating table 1. A T-shaped track is provided on the support 8, and a T-shaped groove is provided on the movable frame 9, allowing the movable frame 9 to slide on the support 8. A through slot is provided on the support 8, and the feed screw 10 is rotatably mounted inside the through slot. A motor is fixed to the side wall of the support 8, and the output shaft of the motor is fixedly connected to one end of the feed screw 10. When the feed screw 10 rotates, the transmission frame 11 drives the movable frame 9 to slide on the support 8.

[0034] It is worth noting that the top of the paper coating table 1 is provided with a directional guide groove 12 parallel to the feed screw 10, and the bottom of the moving frame 9 is provided with a bottom support slider 7 that is slidably connected to the directional guide groove 12. Support balls are embedded in the bottom of the bottom support slider 7 and slide against the inner wall of the directional guide groove 12. By installing the bottom support slider 7 at the front end of the moving frame 9, the adjustment process of the moving frame 9 is supported.

[0035] Below the top paper coating roller 2, a drive roller 5 is rotatably mounted and linked to it, and the drive roller 5 is rotatably mounted on the support 8. The two drive rollers 5 at the bottom rotate synchronously with the top paper coating roller 2 through the drive wheel and drive belt.

[0036] The atomizing spray pipe 4 is connected to the slurry coating channel of the paper coating table 1.

[0037] In addition, a leveling roller 6 fixed on the bracket 8 is provided on the side of the paper coating roller 2 near the paper feeding side, and the leveling roller 6 is linked with the paper coating roller 2. The leveling roller 6 ensures that the thickness of the pulp on the inner side of the paper is uniform. The leveling roller 6 replaces the scraper structure. The scraper scrapes the material with line contact, which is prone to scraper vibration, edge leakage, and material accumulation in the middle. The leveling roller 6 is circumferentially attached to the paper web, and the entire width is rolled and flattened synchronously. The longitudinal and transverse thickness of the pulp on the inner side of the paper is more consistent, and stripes of varying thickness are eliminated.

[0038] In addition, both the lower paper coating table 1 and the support 8 are equipped with alignment components that adjust the lateral position of the lower paper coating roller and the upper paper coating roller 2 respectively. The alignment components are threaded rods that are rotatably installed on the lower paper coating table 1 and the support 8 respectively. The outer walls of the two threaded rods are respectively threaded with movable seats that are connected to the lower paper coating roller and the upper paper feeding roller 2.

[0039] The scraper roller 6 is fixed with a baffle 13 at an angle near the side of the paper feeding.

[0040] This embodiment describes a paper-faced gypsum board forming platform with simultaneous upper and lower paper coating. Its working principle is as follows: First, the paper coating table moves at a constant speed along a preset trajectory, and the paper coating roller evenly coats the top of the paper with gypsum slurry. At the same time, the paper is conveyed through the paper coating roller at position 2 to meet the inner coating requirements. Subsequently, the time difference of the forming process is adjusted by the horizontal spacing adjustment mechanism to control the contact time between the paper-feeding pulp and air. During the paper feeding process, the main pulp pipeline supplies gypsum pulp to the atomizing spray pipeline 4 through branch pipelines, spraying the pulp onto the inner side of the upper paper feeding layer. In conjunction with the linked paper feeding pulp coating roller 2 and the leveling roller 6, the sprayed pulp is rolled and spread to ensure that the thickness of the pulp on the inner side of the paper feeding layer is uniform. Finally, the inner side of the coated upper paper is turned downward by the flipping roller 3 and aligned and bonded with the coated lower paper to initially form a double-sided gypsum board.

[0041] The main components of sprayed gypsum slurry are hemihydrate gypsum plaster, modified starch, retarder, foaming agent, modifier, reinforcing agent, dye, waterproofing agent, formaldehyde decomposition additive, antifungal agent, hydrophilic aerogel refractory material, etc.

[0042] The sprayed gypsum slurry can be gypsum slurry of a specific density, gypsum slurry with an unfixed color, water-based dyes, various adhesive emulsions and slurries, various polymer water-repellent emulsions and slurries, various emulsions and slurries containing refractory materials, and solutions and slurries containing formaldehyde-decomposing, antifungal, and other additives that can improve the special functions of gypsum board. The coating interface is the bonding surface between the facing paper and the gypsum board core.

[0043] By using coating equipment, different areas inside the gypsum board can have different densities and functions to achieve special uses, such as lightweight and high strength, high nail holding power, high water resistance, long-term fire resistance, formaldehyde decomposition, and prevention of mold growth on the board surface. Example

[0044] Furthermore, the support 8 can be a lifting device, and the lifting end of the lifting device is slidably set on the movable frame 9. The outer support of the lifting device is fixed on the side of the paper coating table 1. The movable frame 9 slides on the lifting end of the lifting device, so that the entire paper feeding and coating process is carried out at the lifting end of the lifting device. The lifting device is a mechanical structure such as a lifting machine commonly used in this field. The distance between the paper feed and the paper feed is adjusted by the lifting device.

[0045] A manufacturing process for paper-faced gypsum board with simultaneous top and bottom paper coating: S1: Based on the functional requirements of the finished product, the raw materials are proportioned, using hemihydrate gypsum plaster as the base material. Modified starch, reinforcing agents, and modifiers are added sequentially to improve the structural strength and stability of the board. Retarder and foaming agent are added to adjust the slurry setting speed and the lightweight properties of the board. Waterproofing agents, hydrophilic aerogel refractory materials, formaldehyde removal additives, mildew inhibitors, dyes, and other functional components are added as needed. The mixture is thoroughly stirred to prepare a uniform and stable functional coating slurry. The prepared slurry is introduced into the main slurry pipeline of the equipment, and branch pipelines are connected to the coating channel of the lower paper coating roller and the upper paper atomizing spray pipeline to achieve a continuous and stable supply of slurry.

[0046] S2: Calibrate the conveying trajectory of the paper coating table 1, and adjust the linkage speed of the paper coating roller 2 and the transmission roller 5 to achieve matching of the conveying speed of the paper. Preset the initial distance between the flipping roller 3 and the paper coating roller 2 through the horizontal distance adjustment mechanism, and calibrate the slurry curing time difference in combination with the production environment temperature and the production line conveying speed. Adjust the spraying parameters of the atomizing spray pipe 4, the roller pressure gap of the scraping roller 6 and the horizontal alignment components of the equipment to ensure the coating alignment accuracy and the slurry spreading thickness standard. Start the paper coating table 1 and control the paper to be conveyed forward at a uniform speed along the preset trajectory. During the conveying process, the paper coating roller applies slurry evenly to the entire surface of the paper (the surface that is connected to the board core) to ensure that the slurry thickness on the paper surface is consistent, there is no leakage, and there is no accumulation of material, thus completing the pre-coating process of the bottom protective paper of the gypsum board.

[0047] S3: Control the paper feed to be conveyed at a uniform speed along the paper feed coating table 1. The paper feed coating roller applies a uniform coating to the entire surface of the paper feed and the gypsum board core, completing the paper feed pre-coating process. The upper paper is then conveyed along the equipment feeding path to the upper paper coating roller position. Based on the equipment structure, the inner side of the upper paper faces the atomizing spray pipe. At this time, the atomizing spray pipe atomizes the functional slurry and sprays it evenly onto the inner surface of the upper paper. Compared with the traditional direct coating process, atomizing spraying can significantly improve the coating thickness accuracy, adapt to the needs of low-density thin-layer coating, and the slurry setting time can be flexibly adjusted by adjusting the spraying parameters.

[0048] S4: The paper is conveyed along the preset path to the paper coating roller 2 station. The paper is conveyed along the preset path to the paper coating roller (2) station. In the gypsum slurry conveying pipe 13, a retarder and a small amount of foaming liquid are added. The core of the slurry conveying is the peristaltic pump 15. The peristaltic pump 15 controls the flow rate of the slurry at a frequency of once every 0.5 seconds.

[0049] In the remaining pipeline, a solenoid valve controls the clamp valve 14 to repeatedly clamp the remaining pipeline to prevent clumping and solidification. The pipeline is suspended in the air by an elastic rope, and the conveying pipeline 13 jumps freely under the action of the clamp valve 14. Subsequently, the functional coating slurry is atomized and evenly sprayed onto the inner bonding surface of the paper through the atomizing spray pipeline 4. The paper coating roller 2 and the leveling roller 6 work together to roll and flatten the paper, achieving uniform spreading of the paper slurry in both longitudinal and transverse directions, completing the precise coating and leveling of the paper. After the atomized spraying of the paper, the paper passes through the combined mechanism of the paper coating roller and the leveling roller, which uses the circumferential surface of the leveling roller to fully adhere to the paper web and roll and flatten it, replacing the traditional line contact scraping structure of the scraper. This completely solves the defects such as slurry leakage, material accumulation, uneven thickness, and stripes caused by scraper vibration, achieving uniform thickness of the slurry in both longitudinal and transverse directions on the inner side of the paper, ensuring the flatness and specification uniformity of the board surface. At the same time, the drive roller and the paper feeding and coating roller operate synchronously, matching the paper feeding speed to avoid paper stretching and deformation and coating misalignment.

[0050] S5: The feed screw driven by the horizontal distance adjustment mechanism drives the moving frame 9 to slide precisely, fine-tuning the horizontal distance between the flipping roller 3 and the upper paper coating roller 2. This precisely controls the contact time between the upper paper coating slurry and the air, matching the production line operating conditions and avoiding problems such as premature slurry curing and viscosity failure. Based on the ambient temperature and production line conveying speed, the feed screw is driven to rotate by the horizontal distance adjustment mechanism, causing the moving frame to slide precisely along the support and guide groove. This fine-tunes the horizontal distance between the flipping roller and the upper paper coating roller, precisely controlling the contact time between the upper paper coating slurry and the air, accurately controlling the slurry curing time difference, avoiding problems such as premature slurry curing and insufficient viscosity, and ensuring that the slurry is in the optimal bonding state when bonding.

[0051] S6: The paper feeding direction is adjusted by the flipping roller 3 so that the inner side of the paper coated with slurry faces down, and it is precisely aligned and tightly bonded with the paper that has been coated with slurry, forming a double-layer facing paper gypsum board blank. The paper that has completed slurry coating, leveling and time difference control is precisely adjusted by the flipping roller so that the inner side coated with functional slurry faces down, and it is precisely aligned and tightly bonded with the paper that has been coated with bottom slurry. The upper and lower slurry layers are simultaneously bonded to the board core, and a double-layer facing paper gypsum board blank is initially formed.

[0052] S7: The gypsum board blank is naturally cured or assisted in drying and curing to ensure full bonding and fusion of the upper and lower pulp layers with the core. After curing, it is cut, trimmed, and inspected to obtain the finished functional paper-faced gypsum board. The bonded gypsum board blank is then transported to the subsequent curing station for natural curing or assisted drying and curing according to the characteristics of the pulp formula, ensuring full bonding and fusion of the upper and lower pulp layers with the gypsum board core, completely eliminating delamination and hollow areas, and improving the overall structural stability of the board. After curing, it is cut, trimmed, and inspected to finally obtain finished paper-faced gypsum board with differentiated functions such as high strength, water resistance, fire resistance, formaldehyde removal, and mildew resistance.

[0053] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0054] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A paper-faced gypsum board forming platform for simultaneous upper and lower paper coating, comprising a lower paper coating table (1), characterized in that, The paper coating table (1) is provided with a paper coating roller (2) that feeds upwards in the same direction as the paper coating roller (2). The paper coating roller (2) is rotatably mounted on the side wall of the paper coating table (1) via a bracket (8). A flipping roller (3) for adjusting the paper feeding direction is provided on the side of the paper coating roller (2) near the paper. The flipping roller (3) is rotatably mounted on the bracket (8) via a horizontal distance adjustment mechanism for adjusting the time difference of the slurry curing. An atomizing spray pipe (4) facing the inside of the paper is provided between the flipping roller (3) and the paper coating roller (2).

2. The paper-faced gypsum board forming platform with simultaneous upper and lower paper coating according to claim 1, characterized in that: The atomizing spray pipe (4) is connected to the output pump of the gypsum mixer through the conveying pipe (13). The conveying pipe (13) is equipped with a peristaltic pump (15) to prevent the slurry from solidifying, and the conveying pipe (13) is uniformly equipped with clamp valves (14) on both sides of the peristaltic pump (15).

3. The paper-faced gypsum board forming platform with simultaneous upper and lower paper coating according to claim 1, characterized in that: The horizontal distance adjustment mechanism includes a movable frame (9) that is slidably disposed on the bracket (8), a feed screw (10) that is parallel to the paper feeding trajectory is rotatably disposed on the bracket (8), and a transmission frame (11) that is threadedly connected to the feed screw (10) is fixed on the side wall of the movable frame (9). The top of the paper coating table (1) is provided with a directional guide groove (12) parallel to the feed screw (10), and the bottom of the moving frame (9) is provided with a bottom support slider (7) that is slidably connected to the directional guide groove (12).

4. The paper-faced gypsum board forming platform with simultaneous upper and lower paper coating according to claim 1, characterized in that: The paper coating roller (2) is rotatably mounted below a transmission roller (5) that is linked to it, and the transmission roller (5) is rotatably mounted on a support (8).

5. The paper-faced gypsum board forming platform with simultaneous upper and lower paper coating according to claim 1, characterized in that: The atomizing spray pipe (4) is connected to the slurry coating channel of the paper coating table (1).

6. The paper-faced gypsum board forming platform for simultaneous upper and lower paper coating according to claim 1, characterized in that: The paper coating roller (2) is provided with a scraper roller (6) fixed on the bracket (8) on the side near the paper feeding side, and the scraper roller (6) is linked with the paper coating roller (2).

7. The paper-faced gypsum board forming platform with simultaneous upper and lower paper coating according to claim 1, characterized in that: Both the lower paper coating table (1) and the support (8) are equipped with alignment components that adjust the lateral position of the lower paper coating roller and the upper paper coating roller (2), respectively.

8. The paper-faced gypsum board forming platform for simultaneous upper and lower paper coating according to claim 1, characterized in that: The bracket (8) can be a lifting device, and the movable frame (9) is slidably set with the lifting end of the lifting device.

9. The paper-faced gypsum board forming platform for simultaneous upper and lower paper coating according to claim 1, characterized in that: The scraper roller (6) is fixed with a baffle (13) at an angle near the side of the paper feeding.

10. A process for preparing paper-faced gypsum board with simultaneous upper and lower paper coating is applied to the paper-faced gypsum board forming platform with simultaneous upper and lower paper coating as described in any one of claims 1-9, characterized in that: S1: Using hemihydrate gypsum plaster as a base, add modified starch, retarder, foaming agent, modifier, and reinforcing agent in proportion. Add one or more of the following as needed: dye, waterproofing agent, formaldehyde decomposition agent, antifungal agent, and hydrophilic aerogel refractory material. Stir evenly to obtain gypsum coating slurry suitable for different functional requirements. S2: Calibrate the conveying trajectory of the paper coating table (1), adjust the linkage speed of the paper coating roller (2) and the transmission roller (5) to achieve matching of the paper conveying speed; preset the initial distance between the flipping roller (3) and the paper coating roller (2) through the horizontal distance adjustment mechanism, and calibrate the slurry curing time difference in combination with the production environment temperature and the production line conveying speed; adjust the spraying parameters of the atomizing spray pipe (4), the roller pressure gap of the scraping roller (6) and the horizontal alignment components of the equipment to ensure the coating alignment accuracy and the slurry spreading thickness standard; S3: Control the paper to be conveyed at a uniform speed along the paper coating table (1), and use the paper coating roller to uniformly coat the paper and the gypsum board core interface to complete the paper pre-coating process. S4: The paper is conveyed along the preset path to the paper coating roller (2) station. In the gypsum slurry conveying pipe (13), a retarder and a small amount of foaming liquid are added. The core of the slurry conveying is the peristaltic pump (15). The peristaltic pump (15) controls the flow rate of the slurry at a frequency of once every 0.5 seconds. In the remaining pipeline, the solenoid valve controls the clamp valve (14) to repeatedly clamp the remaining pipeline to prevent caking and solidification. The pipeline is suspended in the air by an elastic rope. Under the action of the clamp valve (14), the conveying pipeline (13) jumps freely. Then, the functional coating slurry is atomized and evenly sprayed onto the inner bonding surface of the paper through the atomizing spray pipeline (4). The paper coating roller (2) and the scraping roller (6) work together to roll and flatten the paper, so as to achieve uniform spreading of the paper slurry in both longitudinal and transverse directions and complete the precise coating and leveling of the paper. S5: The feed screw of the horizontal distance adjustment mechanism drives the moving frame (9) to slide precisely, and finely adjusts the horizontal distance between the flipping roller (3) and the paper coating roller (2), so as to accurately control the contact time between the paper coating slurry and the air, match the operating conditions of the production line, and avoid the problems of premature curing of slurry and viscosity failure. S6: Adjust the paper feeding direction by turning roller (3) so that the inner side of the upper paper with slurry coating faces down and is precisely aligned and tightly attached to the lower paper that has been coated with slurry, forming a double-layer gypsum board blank; S7: The gypsum board blank is naturally cured or assisted in drying and curing to fully bond and fuse the upper and lower pulp layers with the core. After curing, it is cut, trimmed and inspected to obtain the finished functional paper-faced gypsum board.

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