A papermaking coating system

Abstract

The utility model relates to a kind of papermaking coating systems, including raw material tank, raw material tank is used to accommodate coating;Feed sieve, feed sieve is connected with raw material tank by pipeline communication;Conveying pump, conveying pump is set on the pipeline between feed sieve and raw material tank;Transfer tank, transfer tank is connected with feed sieve by pipeline, transfer tank is used to accommodate, buffer coating;First-stage sieve, first-stage sieve is connected with transfer tank by pipeline, first-stage sieve is used to filter coating;Circulating pump, circulating pump is set on the pipeline between transfer tank and first-stage sieve, circulating pump is used to circulate and transport coating;Coating machine, coating machine is connected with first-stage sieve by pipeline, coating machine is used to be coated to the coating on the surface of raw paper;Second-stage sieve, second-stage sieve is connected with first-stage sieve by pipeline, second-stage sieve is connected with transfer tank by pipeline, second-stage sieve is used to filter coating;And first conveying pipeline, first conveying pipeline one end is connected on the pipeline between conveying pump and feed sieve, first conveying pipeline other end is connected in second-stage sieve.

Description

Technical Field

[0001] This utility model relates to the field of paper coating technology, and specifically to a paper coating system. Background Technology

[0002] Paper coating systems involve uniformly coating the surface of base paper with one or more layers of coating (mainly composed of pigments, adhesives, additives, and water) to improve the paper's smoothness, gloss, printability, and other properties.

[0003] Currently, the two-stage screen filling system for paper coating uses a single-stage screen filling mode, where the slag filtered by the single-stage screen flows directly to the second-stage screen for filtration. If the pressure becomes unstable during the filling process of the single-stage screen, and then the coating flows to the second-stage screen for filtration, it can easily lead to pressure instability in the second-stage screen as well. This instability in both the single-stage and second-stage screens causes changes in the flow rate and volume of the filling coating, resulting in uneven filling and missed coating. Missed coating not only affects product quality and causes surface defects, but can also lead to equipment wear and increased production costs. Utility Model Content

[0004] Therefore, a paper coating system is needed to address the current paper coating system where the two-stage screen filling process uses a single-stage screen. If the pressure becomes unstable during the single-stage screen filling process, and the coating then flows to the second-stage screen for filtration, the pressure on the second-stage screen can also become unstable. This instability in both the single and second-stage screens leads to changes in the flow rate and volume of the filling coating, resulting in uneven filling and missed coating. Missed coating not only affects product quality and causes surface defects but can also lead to equipment wear and increased production costs.

[0005] To achieve the above objectives, the inventors provide a paper coating system, comprising:

[0006] A raw material tank, the raw material tank being used to contain coatings;

[0007] A feed screen is connected to the raw material tank via a pipeline, and the feed screen is used for preliminary filtration of the coating.

[0008] A conveying pump is installed on the pipeline between the feed screen and the raw material tank, and the conveying pump is used to convey the coating.

[0009] A transfer tank, which is connected to the feed screen via a pipeline, is used to contain and buffer the coating.

[0010] A primary screen is connected to the transfer tank via a pipeline, and the primary screen is used to filter coatings;

[0011] A circulating pump is installed on the pipeline between the transfer tank and the first-stage screen, and the circulating pump is used to circulate and transport the coating.

[0012] A coating machine, which is connected to the first-section screen via a pipeline, is used to coat the coating material onto the surface of the base paper;

[0013] The second-stage screen is connected to the first-stage screen via a pipeline, and is also connected to the transfer tank via a pipeline. The second-stage screen is used to filter coatings.

[0014] And a first conveying pipe, one end of which is connected to the pipeline between the conveying pump and the feed screen, and the other end of which is connected to the second-stage screen.

[0015] As a preferred structure of this utility model, there are multiple segment screens, which are arranged sequentially and connected sequentially.

[0016] As a preferred structure of this utility model, the paper coating system further includes a sewage tank, which is connected to the two-stage screen via a pipeline.

[0017] As a preferred structure of this utility model, the paper coating system further includes a control mechanism, a solenoid valve, and a manual valve;

[0018] The solenoid valve is installed on the first conveying pipeline, and the solenoid valve is electrically connected to the control mechanism. The control mechanism is used to control the operation of the paper coating system.

[0019] The manual valve is installed on the first delivery pipeline.

[0020] As a preferred structure of this utility model, the paper coating system further includes a pressure detection mechanism and a flow regulating valve. The pressure detection mechanism and the flow regulating valve are respectively disposed on the first conveying pipeline. The pressure detection mechanism is electrically connected to the control mechanism, and the flow regulating valve is electrically connected to the control mechanism. The pressure detection mechanism is used to detect the pressure in the first conveying pipeline, and the control mechanism is also used to receive and process the detection signal of the pressure detection mechanism and control the opening size of the flow regulating valve.

[0021] As a preferred structure of this utility model, the paper coating system further includes a material tray and a square screen;

[0022] The tray is positioned below the coating machine and is used to collect coatings that fall from the coating machine.

[0023] The square screen is connected to the material tray via a pipeline, and the square screen is used to filter the coating.

[0024] The transfer tank and the square screen are connected by a pipeline.

[0025] As a preferred embodiment of this utility model, the transfer tank includes:

[0026] Tank body;

[0027] A feed pipe, one end of which penetrates the tank body, and the other end of which extends from top to bottom to the middle or lower middle part of the tank body;

[0028] And a diverter, one end of which is connected to the other end of the feed pipe and is in communication with the feed pipe. The diverter is used to divert the paint to reduce the impact force on the paint in the tank.

[0029] As a preferred structure of this utility model, the transfer tank further includes an elbow, which is disposed between the feed pipe and the distributor. One end of the elbow is connected to the feed pipe, and the other end of the elbow is connected to the distributor. The elbow is in communication with the feed pipe and the distributor.

[0030] In a preferred embodiment of this invention, the bottom surface of the other end of the diverter faces the side wall of the tank.

[0031] As a preferred structure of this utility model, the diverter includes a diverting body, the bottom surface of which faces the side wall of the tank, and the bottom surface of the diverting body is provided with a plurality of first through holes;

[0032] One side of the diversion body faces the top of the tank, and the one side of the diversion body is provided with a plurality of second through holes;

[0033] The other side of the diversion body faces the bottom of the tank.

[0034] The advantages of the above technical solution, which differs from existing technologies, are as follows: In the paper coating system of this utility model, the prepared coating is stored in a raw material tank. The conveying pump is started to transport the coating from the raw material tank to the feed screen. The feed screen performs preliminary filtration of the coating to remove larger particulate impurities. The coating after preliminary filtration enters the transfer tank. Then, the circulation pump is started to transport the coating in the transfer tank to a first-stage screen for filtration. The coating that meets the coating requirements after the first-stage filtration is transported to the coating machine. The coating machine evenly coats the surface of the base paper according to the set process parameters. Another part of the coating that does not meet the coating requirements is transported to a second-stage screen for further filtration. The coating that meets the coating requirements after the second-stage filtration flows to the transfer tank. The raw material tank and the second-stage screen are connected by a first conveying pipe. The coating in the raw material tank can be directly transported to the second-stage screen for filtration, reducing pressure fluctuations. The design, which separates the primary and secondary screens from the raw material tank, reduces or eliminates the transmission path of pressure fluctuations from the primary screen to the secondary screen. This reduces or eliminates the problem of uneven coating caused by pressure fluctuations affecting the filling of the primary screen. At the same time, the buffering effect of the transfer tank reduces the impact of pressure fluctuations on the coating process. Compared with existing technologies, this design significantly improves pressure stability. Stable pressure and flow rate ensure uniform coating filling, effectively solving the problem of missed coating and significantly improving the surface quality of paper. On the one hand, it reduces product rework and scrap due to missed coating, reducing raw material waste. On the other hand, stable operating pressure reduces equipment wear and extends the service life of components such as screens and pipes.

[0035] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0036] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0037] In the accompanying drawings of the instruction manual:

[0038] Figure 1 This is one of the process diagrams of the paper coating system described in the specific implementation embodiment;

[0039] Figure 2 This is a second schematic diagram of the paper coating system described in the specific implementation method;

[0040] Figure 3 This is a circuit connection diagram of the paper coating system described in a specific embodiment;

[0041] Figure 4 This is a schematic diagram of the structure of the transfer tank described in the specific implementation method;

[0042] Figure 5 This is a schematic diagram of the structure of the splitter described in a specific implementation.

[0043] The reference numerals used in the above figures are explained as follows:

[0044] 100. Raw material tank

[0045] 101. Transfer pump,

[0046] 200. A single-stage sieve.

[0047] 300. Coating machine

[0048] 400, tray,

[0049] 500, two-stage sieve,

[0050] 501. Sewage tank

[0051] 600. First conveying pipeline,

[0052] 601. Solenoid valve

[0053] 602. Manual valve.

[0054] 603. Pressure testing agency

[0055] 604. Flow regulating valve.

[0056] 605. Control mechanism,

[0057] 700. Feed screen

[0058] 701. Circulating pump,

[0059] 800, square sieve,

[0060] 900, transfer tank,

[0061] 1. Tank body,

[0062] 11. Discharge port,

[0063] 2. Feed pipe,

[0064] 3. Diverter,

[0065] 31. Diversion Entity

[0066] 32. First through hole,

[0067] 33. Second through hole,

[0068] 4. Elbow. Detailed Implementation

[0069] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0070] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0071] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0072] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0073] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0074] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0075] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0076] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. These expressions are only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, in this context, it should be understood that when it is mentioned that an element is connected "on" or "below" another element, it can be directly connected not only to the other element "on" or "below," but also indirectly connected to the other element "on" or "below" through an intermediate element.

[0077] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] Please see Figures 1 to 5 This embodiment relates to a paper coating system, comprising:

[0079] Raw material tank 100 is used to contain coatings; raw material tank 100 serves as the coating supply source for the entire coating system, ensuring safe storage and stable supply of coatings, and preventing production interruptions due to coating shortages.

[0080] The feed screen 700 is connected to the raw material tank 100 via a pipeline. The feed screen 700 is used for preliminary filtration of the coating. The feed screen 700 is used to initially remove larger particulate impurities from the coating, preventing these impurities from entering the subsequent precision filtration and coating stages of the first-stage screen 200 and the second-stage screen 500, which would affect product quality and normal equipment operation, improve the purity of the coating, reduce the risk of blockage in subsequent equipment, and ensure stable system operation.

[0081] A conveying pump 101 is installed on the pipeline between the feed screen 700 and the raw material tank 100. The conveying pump 101 is used to convey the coating material. The conveying pump 101 provides power for the flow of the coating material, controls the conveying speed and flow rate, and ensures that the coating material can be delivered to the designated location according to production needs. The conveying pump 101 ensures the continuity and controllability of the coating material delivery, providing a stable material transfer guarantee for the entire coating process. In this embodiment, the conveying pump 101 is a screw pump.

[0082] The transfer tank 900 is connected to the feed screen 700 via a pipeline. The transfer tank 900 is used to contain and buffer the coating. The transfer tank 900 receives the coating after preliminary filtration by the feed screen 700, temporarily stores and buffers the coating, reduces pressure fluctuations during the coating flow process, makes the coating state more stable, effectively isolates the impact of pressure fluctuations in the upstream equipment on the subsequent filtration and coating processes, and provides stable coating supply conditions for subsequent processes.

[0083] A primary screen 200 is connected to the transfer tank 900 via a pipeline. The primary screen 200 is used to filter the coating material; it further filters the coating material transported from the transfer tank 900. The primary screen 200 has a higher screen precision than the feed screen 700, allowing it to filter out finer impurities, further purifying the coating, improving its quality, and ensuring it meets coating requirements. This ensures that the coating material entering the coating machine 300 has a low impurity content, improving coating quality and reducing product defects caused by coating impurities.

[0084] A circulation pump 701 is installed on the pipeline between the transfer tank 900 and the first-stage screen 200. The circulation pump 701 is used to circulate and transport the coating material; the circulation pump 701 maintains the circulation of the coating material between systems. In this embodiment, the circulation pump 701 can be a screw pump.

[0085] A coating machine 300 is connected to a first-stage sieve 200 via a pipeline. The coating material that meets the coating requirements and is filtered in the first-stage sieve 200 is transported to the coating machine 300 for use. The coating machine 300 is used to coat the coating material onto the surface of the base paper. The coating machine 300 evenly coats the coating material onto the surface of the base paper, thereby improving the paper's performance.

[0086] A second-stage sieve 500 is connected to a first-stage sieve 200 via a pipeline. The second-stage sieve 500 is used to filter coatings. Coatings that do not meet coating requirements and are filtered out in the first-stage sieve 200 are transported to the second-stage sieve 500 for further filtration. The second-stage sieve 500 is connected to a transfer tank 900 via a pipeline. Coatings that meet coating requirements and are filtered out in the second-stage sieve 500 are transported to the transfer tank 900, while coatings that do not meet coating requirements and are filtered out in the second-stage sieve 500 are discharged. The second-stage sieve 500 further removes residual impurities from the coating and supplements and optimizes the filtration effect of the first-stage sieve 200, improving the purity of the coating and ensuring that the final coating quality on the paper meets high standards. This reduces equipment wear and product quality problems caused by coating impurities.

[0087] A first conveying pipe 600 is provided, one end of which is connected to the pipeline between the conveying pump 101 and the feed screen 700, and the other end is connected to the second-stage screen 500. The raw material tank 100 and the second-stage screen 500 are connected via the first conveying pipe 600, allowing the coating material in the raw material tank 100 to be directly conveyed to the second-stage screen 500 for filtration, reducing pressure fluctuations. The design of independent feed from the raw material tank 100 to the first-stage screen 200 and the second-stage screen 500 reduces or avoids the transmission path of pressure fluctuations from the first-stage screen 200 to the second-stage screen 500, thus reducing or avoiding uneven coating distribution caused by pressure fluctuations affecting the filling of the first-stage screen 200.

[0088] Specifically, in the paper coating system of this embodiment, the prepared coating is stored in the raw material tank 100. The conveying pump 101 is started to convey the coating from the raw material tank 100 to the feed screen 700. The feed screen 700 performs preliminary filtration of the coating to remove larger particulate impurities. The pre-filtered coating enters the transfer tank 900. Then, the circulation pump 701 is started to convey the coating in the transfer tank 900 to the first-stage screen 200 for filtration. The coating that meets the coating requirements after filtration by the first-stage screen 200 is conveyed to the coating machine 300. The coating machine 300 uniformly coats the coating onto the surface of the base paper according to the set process parameters. Another part of the coating that does not meet the coating requirements is conveyed to the second-stage screen 500 for further filtration. The coating that meets the coating requirements after filtration by the second-stage screen 500 flows to the transfer tank 900. The raw material tank 100 and the second-stage screen 500 are connected by the first conveying pipe 600. The coating in the raw material tank 100 can be directly conveyed to the second-stage screen 500 for filtration to reduce pressure fluctuations. The design, which independently feeds material from the raw material tank 100 to the first-stage screen 200 and the second-stage screen 500, reduces or avoids the transmission path of pressure fluctuations from the first-stage screen 200 to the second-stage screen 500. This reduces or avoids the problem of uneven coating caused by pressure fluctuations affecting the filling of the first-stage screen 200. At the same time, the buffering effect of the transfer tank 900 reduces the impact of pressure fluctuations on the coating process. Compared with existing technologies, this design significantly improves pressure stability. Stable pressure and flow rate ensure the uniformity of coating filling, effectively solve the problem of missed coating, and significantly improve the surface quality of paper. On the one hand, it reduces product rework and scrap due to missed coating, reducing raw material waste. On the other hand, stable operating pressure reduces equipment wear and extends the service life of components such as screens and pipes.

[0089] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, there are multiple first-stage screens 200, which are arranged sequentially and connected to each other to form a multi-stage filtration system. Each first-stage screen 200 is connected by a pipe to ensure smooth passage of the coating material, thereby achieving multi-stage fine filtration and significantly improving the filtration effect. This results in higher coating quality, meeting the needs of high-end coated paper production. Simultaneously, it disperses the filtration pressure, reduces the load on individual screens, extends screen life, and reduces equipment maintenance costs.

[0090] Optionally, in some embodiments, such as Figure 1 and Figure 2As shown, the paper coating system also includes a wastewater tank 501, which is connected to the second-stage screen 500 via a pipeline. The wastewater tank 501 is used to collect and treat coatings discharged from the second-stage screen 500 that do not meet coating requirements, allowing for centralized treatment and preventing direct discharge of wastewater that could pollute the environment.

[0091] Optionally, in some embodiments, such as Figures 1 to 3 As shown, the paper coating system also includes a control mechanism 605, a solenoid valve 601, and a manual valve 602. The solenoid valve 601 is installed on the first conveying pipe 600 and is electrically connected to the control mechanism 605. The control mechanism 605 is used to control the operation of the paper coating system. By controlling the opening and closing of the solenoid valve 601, precise control of the feed to the second-stage screen 500 is achieved. The control mechanism 605 is a PLC control mechanism. Furthermore, the manual valve 602 is installed on the first conveying pipe 600. The manual valve 602 serves as a backup control component, used when manual intervention or equipment debugging is required.

[0092] Optionally, in some embodiments, such as Figures 1 to 3 As shown, the paper coating system also includes a pressure detection mechanism 603 and a flow regulating valve 604. The pressure detection mechanism 603 and the flow regulating valve 604 are respectively disposed on the first conveying pipe 600. The pressure detection mechanism 603 is electrically connected to the control mechanism 605, and the flow regulating valve 604 is electrically connected to the control mechanism 605. The pressure detection mechanism 603 is used to detect the pressure in the first conveying pipe 600. The control mechanism 605 is also used to receive and process the detection signal from the pressure detection mechanism 603 and control the opening size of the flow regulating valve 604. The control mechanism 605 can receive and process the detection signal from the pressure detection mechanism 603 and control the opening size of the flow regulating valve 604 according to the signal, thereby realizing the dynamic adjustment of the feed flow of the second-stage screen 500, maintaining the system pressure stability, and adjusting the coating feed flow in real time according to the pressure change in the first conveying pipe 600 to ensure that the coating enters the second-stage screen 500 under stable pressure, thereby achieving uniform and stable slag discharge and filling, and effectively solving the problem of coating leakage caused by pressure fluctuation. In this embodiment, the pressure detection mechanism 603 is a pressure sensor.

[0093] Specifically, in this embodiment, such as Figures 1 to 3As shown, the pressure detection mechanism 603 monitors the pressure within the first conveying pipe 600 in real time and transmits the pressure data to the control mechanism 605. Based on a preset pressure threshold (e.g., 0.3-0.5 MPa), the control mechanism 605 controls the flow regulating valve 604 to reduce its opening when the pressure is higher than 0.5 MPa, thus decreasing the feed rate to the second-stage screen 500; and controls the flow regulating valve 604 to increase its opening when the pressure is lower than 0.3 MPa, thus increasing the feed rate to the second-stage screen 500. This maintains stable system pressure, ensuring that the coating enters the second-stage screen 500 under stable pressure, thereby achieving uniform and stable slag discharge and filling, effectively solving the problem of coating leakage caused by pressure fluctuations.

[0094] Optionally, in some embodiments, such as Figures 1 to 5 As shown, the paper coating system also includes a material tray 400 and a square screen 800; the material tray 400 is located below the coating machine 300 and is used to receive coatings falling from the coating machine 300; the square screen 800 is connected to the material tray 400 through a pipeline and is used to filter the coatings; the transfer tank 900 is connected to the square screen 800 through a pipeline to realize the recycling of coatings, avoid coating waste, thereby reducing production costs and improving resource utilization.

[0095] Optionally, in some embodiments, such as Figure 4 and Figure 5 As shown, the transfer tank 900 includes a tank body 1, a feed pipe 2, and a distributor 3. The tank body 1 is the main container of the transfer tank 900, used to hold recycled paper coatings and provide storage space for the coatings. As the basic carrier of the entire transfer tank 900, the tank body 1's internal space is used to store the coatings. The material of the tank body 1 is generally made of corrosion-resistant materials, such as stainless steel, to ensure that it will not corrode under long-term contact with the coatings, maintaining the structural strength and service life of the tank body 1. The tank body 1 provides a stable and reliable storage place for the recycled coatings, serving as the fundamental guarantee for the entire coating recycling process. The shape of the tank body 1 is cylindrical or square, designed according to actual production needs and site space. The tank body 1 is also equipped with a discharge port 11 to facilitate the inflow and outflow of coatings.

[0096] Furthermore, one end of the feed pipe 2 penetrates the tank 1 and connects to an external paint recovery pipe, while the other end of the feed pipe 2 extends from top to bottom to the middle of the tank 1; or the other end of the feed pipe 2 extends from top to bottom to the lower middle part of the tank 1. This low-level feeding design changes the traditional high-drop feeding method of the feed pipe 2. By shortening the height of the paint drop, the flow rate and impact force of the paint entering the tank 1 are reduced, effectively reducing the impact force of the paint entering the tank 1, reducing bubbles and foam generated by high-speed impact on the liquid surface, improving the stability of the recovered paint, and providing better quality paint raw materials for subsequent coating production. The diameter of the feed pipe 2 is designed according to the paint recovery flow rate, and the feed pipe 2 adopts a circular pipe to ensure the smooth flow of paint within the pipe.

[0097] Furthermore, one end of the diverter 3 is connected to the other end of the feed pipe 2, and the diverter 3 is in communication with the feed pipe 2. The diverter 3 is used to divert the paint to reduce the impact force on the paint in the tank 1. The diverter 3 is a device installed at the end of the feed pipe 2. The main function of the diverter 3 is to divert the paint conveyed from the feed pipe 2, so that the paint enters the tank 1 in a more dispersed and gentle manner, avoiding the paint from concentrating and impacting the liquid surface in the tank, and further reducing the generation of bubbles. The diverter 3 is made of corrosion-resistant metal or plastic material.

[0098] Specifically, in the transfer tank 900 of the paper coating recycling system in this embodiment, the other end of the feed pipe 2 extends from top to bottom to the middle or lower middle part of the tank body 1. This low-level feeding design changes the traditional feeding method with a high drop of the feed pipe 2. By shortening the height of the coating fall, the flow rate and impact force of the coating when entering the tank body 1 are reduced, effectively reducing the impact force of the coating when entering the tank body 1, reducing bubbles and foam generated by high-speed impact on the liquid surface, improving the stability of the recycled coating, and providing better quality coating raw materials for subsequent coating production. Furthermore, the diverter 3 is installed at the other end of the feed pipe 2. The diverter 3 diverts the coating transported from the feed pipe 2, allowing the coating to enter the tank body 1 in a more dispersed and gentle manner, avoiding concentrated impact of the coating on the liquid surface inside the tank, further reducing the generation of bubbles, avoiding or reducing problems such as missed coating and increased bubble pressure points, improving the stability of the recycled coating, and providing better quality coating raw materials for subsequent coating production.

[0099] Optionally, in some embodiments, such as Figure 4 and Figure 5As shown, the transfer tank 900 also includes an elbow 4, which is disposed between the feed pipe 2 and the diverter 3. One end of the elbow 4 is connected to the feed pipe 2, and the other end is connected to the diverter 3. The elbow 4 is connected to both the feed pipe 2 and the diverter 3. The elbow 4 is a curved pipe component connecting the feed pipe 2 and the diverter 3, used to change the flow direction of the coating. By installing the elbow 4 between the feed pipe 2 and the diverter 3, the flow direction of the coating is changed before entering the diverter 3, from a vertical downward flow to a horizontal or inclined flow. This consumes some kinetic energy, reduces the flow rate of the coating, and further weakens the impact force when the coating enters the tank 1, allowing the coating to enter the diverter 3 more smoothly and be diverted. This more effectively reduces the generation of bubbles and improves the stability and reliability of the transfer tank 900 in coating recycling. The material of the elbow 4 is matched with that of the feed pipe 2 and the diverter 3 to ensure the sealing and corrosion resistance of the connection.

[0100] Optionally, in some embodiments, such as Figure 4 and Figure 5 As shown, the bottom surface of the other end of the diverter 3 faces the side wall of the tank 1. This means that when the diverter 3 is installed, its bottom surface is not vertically downwards or towards the center of the tank 1, but rather points towards the side wall of the tank 1. This design allows the diverted paint to flow towards the side wall of the tank 1. When the paint flows out from the bottom surface of the diverter 3, it directly impacts the side wall of the tank 1. The side wall of the tank 1 acts as a barrier and buffer, further slowing the flow rate of the paint and allowing it to slide smoothly down the side wall of the tank 1. This avoids the paint directly impacting the center of the liquid surface inside the tank, reducing violent fluctuations in the liquid surface and air entrainment, greatly reducing the impact of the paint on the liquid surface inside the tank, and effectively reducing the generation of bubbles.

[0101] Optionally, in some embodiments, such as Figure 4 and Figure 5As shown, the diverter 3 includes a diverting body 31, the bottom surface of which faces the side wall of the tank 1. The bottom surface of the diverting body 31 has multiple first through holes 32. This design allows the coating to flow out through the multiple first through holes 32, directly impacting the side wall of the tank 1. The side wall of the tank 1 acts as a barrier and buffer, further slowing the flow rate of the coating and effectively reducing the generation of bubbles. By providing multiple first through holes 32, the coating enters the tank 1 in a more dispersed and gentle manner, avoiding concentrated impact on the liquid surface and effectively reducing bubble generation. Furthermore, one side of the diverting body 31 faces the top of the tank 1, and this side has multiple second through holes 33; similarly, the multiple first through holes 32 allow the coating to enter the tank 1 in a more dispersed and gentle manner, avoiding concentrated impact on the liquid surface and effectively reducing bubble generation. The other side of the diversion body 31 faces the bottom of the tank 1. The other side of the diversion body 31 is solid and sealed without any through holes to prevent the coating from impacting the liquid surface inside the tank vertically, thus effectively reducing the generation of bubbles.

[0102] Optionally, in some embodiments, such as Figure 4 and Figure 5 As shown, multiple first through holes 32 are evenly distributed on the bottom surface of the flow-diverting body 31, and the diameter of the first through holes 32 is 12-18 mm; multiple second through holes 33 are evenly distributed on one side surface of the flow-diverting body 31, and the diameter of the second through holes 33 is 12-18 mm. The through holes on the bottom surface and one side surface cooperate to achieve multi-directional flow diversion of the coating, decomposing the high-speed coating flow into multiple low-speed fine streams, thus reducing the impact energy of the coating. The even distribution of the first through holes 32 and second through holes 33 decomposes the high-speed coating flow into multiple low-speed fine streams, reducing the impact energy of the coating and effectively reducing the generation of bubbles. Specifically, in this embodiment, as... Figure 4 and Figure 5 As shown, the diameter of the first through hole 32 is 15 mm and the diameter of the second through hole 33 is 15 mm. This hole diameter design can effectively control the flow rate of the coating while ensuring the flow rate of the coating from the bottom and one side, and avoid the large impact force caused by the excessive flow rate.

[0103] Specifically, in this embodiment, such as Figure 4 and Figure 5 As shown, the diverting body 31 is funnel-shaped. The funnel shape can better guide the coating to disperse evenly. Multiple through holes are provided on the bottom surface and one side surface of the diverter 3. The first through hole 32 on the bottom surface is used to divert the coating towards the side wall of the tank 1, and the second through hole 33 on the side surface is used to divert the coating towards the top of the tank 1, thereby realizing the multi-directional dispersion of the coating.

[0104] Specifically, in this embodiment, such as Figure 4 and Figure 5 As shown, there are multiple feed pipes 2, multiple diverters 3, and multiple elbows 4; the multiple elbows 4 are respectively arranged between the multiple feed pipes 2 and the multiple diverters 3. Multiple feed pipes 2 can operate simultaneously, collecting paint from different locations and conveying it into the tank 1, greatly improving paint recovery efficiency and meeting the needs of large-scale paint recovery in large-scale production processes. Each feed pipe 2 corresponds to one diverter 3 and one elbow 4, and each channel can independently buffer and divert the paint, avoiding mutual interference between multiple feed pipes 2. The paint in each channel can change its flow direction through the elbow 4 and undergo multi-directional diversion through the diverter 3, smoothly entering the tank 1, achieving uniform diversion and stable delivery of paint across multiple channels, further improving the uniformity of the paint within the tank.

[0105] Specifically, in the paper coating system of this embodiment, the prepared coating is stored in the raw material tank 100, and the conveying pump 101 is started to convey the coating from the raw material tank 100 to the feed screen 700. The feed screen 700 performs preliminary filtration on the coating to remove larger particulate impurities.

[0106] After initial filtration, the coating enters the transfer tank 900. In the transfer tank 900, the coating smoothly enters the tank body 1 through the feed pipe 2, elbow 4, and diverter 3, reducing impact and achieving buffering and stable storage. Then, the circulation pump 701 is started, which transports the coating in the transfer tank 900 to the first-stage screen 200. Multiple first-stage screens 200 sequentially perform multi-stage filtration on the coating, further purifying it.

[0107] Part of the coating after filtration by the first-stage screen 200 is conveyed to the coating machine 300, which evenly coats the base paper surface according to the set process parameters; the other part is conveyed to the second-stage screen 500 for further filtration. During the coating process, the tray 400 receives the coating that falls from the coating machine 300, and after filtration by the square screen 800, it flows back to the transfer tank 900.

[0108] After filtration by the second-stage screen 500, the coating material that meets the coating requirements flows to the transfer tank 900. The design of independent feed from the raw material tank 100 by the first-stage screen 200 and the second-stage screen 500 reduces or avoids the transmission path of pressure fluctuations from the first-stage screen 200 to the second-stage screen 500, thus reducing or avoiding the problem of uneven coating caused by pressure fluctuations affecting the filling of the first-stage screen 200. At the same time, the buffering effect of the transfer tank 900 reduces the impact of pressure fluctuations on the coating process. Compared with existing technologies, this significantly improves pressure stability. Stable pressure and flow rate ensure the uniformity of coating filling, effectively solving the problem of missed coating, significantly improving the surface quality of paper, and reducing product rework and scrap due to missed coating, thus reducing raw material waste. On the other hand, stable operating pressure reduces equipment wear and extends the service life of components such as screens and pipes. The pressure detection mechanism 603 monitors the pressure in the first delivery pipeline 600 in real time and transmits the signal to the control mechanism 605. The control mechanism 605 controls the opening size of the flow regulating valve 604 according to the pressure signal, adjusts the paint flow, stabilizes the system pressure, and realizes the recycling of paint and stable control of system pressure.

[0109] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A paper coating system, characterized in that, include: A raw material tank, the raw material tank being used to contain coatings; A feed screen is connected to the raw material tank via a pipeline, and the feed screen is used for preliminary filtration of the coating. A conveying pump is installed on the pipeline between the feed screen and the raw material tank, and the conveying pump is used to convey the coating. A transfer tank, which is connected to the feed screen via a pipeline, is used to contain and buffer the coating. A primary screen is connected to the transfer tank via a pipeline, and the primary screen is used to filter coatings; A circulating pump is installed on the pipeline between the transfer tank and the first-stage screen, and the circulating pump is used to circulate and transport the coating. A coating machine, which is connected to the first-section screen via a pipeline, is used to coat the coating material onto the surface of the base paper; The second-stage screen is connected to the first-stage screen via a pipeline, and is also connected to the transfer tank via a pipeline. The second-stage screen is used to filter coatings. And a first conveying pipe, one end of which is connected to the pipeline between the conveying pump and the feed screen, and the other end of which is connected to the second-stage screen.

2. The paper coating system according to claim 1, characterized in that: There are multiple segment screens, which are arranged sequentially and connected sequentially.

3. The paper coating system according to claim 1 or 2, characterized in that: The paper coating system also includes a wastewater tank, which is connected to the two-stage screen via a pipeline.

4. The paper coating system according to claim 1 or 2, characterized in that: The paper coating system also includes a control mechanism, a solenoid valve, and a manual valve; The solenoid valve is installed on the first conveying pipeline, and the solenoid valve is electrically connected to the control mechanism. The control mechanism is used to control the operation of the paper coating system. The manual valve is installed on the first delivery pipeline.

5. The paper coating system according to claim 4, characterized in that: The paper coating system further includes a pressure detection mechanism and a flow regulating valve. The pressure detection mechanism and the flow regulating valve are respectively installed on the first conveying pipeline. The pressure detection mechanism is electrically connected to the control mechanism, and the flow regulating valve is electrically connected to the control mechanism. The pressure detection mechanism is used to detect the pressure in the first conveying pipeline. The control mechanism is also used to receive and process the detection signal from the pressure detection mechanism and control the opening size of the flow regulating valve.

6. The paper coating system according to claim 1, characterized in that: The paper coating system also includes a material tray and a square screen; The tray is positioned below the coating machine and is used to collect coatings that fall from the coating machine. The square screen is connected to the material tray via a pipeline, and the square screen is used to filter the coating. The transfer tank and the square screen are connected by a pipeline.

7. The paper coating system according to claim 1 or 6, characterized in that, The transfer tank includes: Tank body; A feed pipe, one end of which penetrates the tank body, and the other end of which extends from top to bottom to the middle or lower middle part of the tank body; And a diverter, one end of which is connected to the other end of the feed pipe and is in communication with the feed pipe. The diverter is used to divert the paint to reduce the impact force on the paint in the tank.

8. The paper coating system according to claim 7, characterized in that: The transfer tank also includes an elbow, which is disposed between the feed pipe and the distributor. One end of the elbow is connected to the feed pipe, and the other end of the elbow is connected to the distributor. The elbow is in communication with the feed pipe and the distributor.

9. The paper coating system according to claim 7, characterized in that: The bottom surface of the other end of the diverter faces the side wall of the tank.

10. The paper coating system according to claim 9, characterized in that: The diverter includes a diverting body, the bottom surface of which faces the side wall of the tank, and the bottom surface of the diverting body is provided with a plurality of first through holes; One side of the diversion body faces the top of the tank, and the one side of the diversion body is provided with a plurality of second through holes; The other side of the diversion body faces the bottom of the tank.

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