A PVC film continuous production humidifying device for plastic recycling processing

Abstract

The application discloses a PVC film continuous production humidifying device for plastic recycling and processing, and relates to the related field of plastic recycling and processing.The device comprises a rack, one side of the rack is provided with a winding part, the winding part is provided with driving force by a driving source, a plurality of water outlets are arranged on the roller wall of the rotating roller at equal angles around the center of the rotating roller, a water supplement cavity is arranged in the rotating roller, the water supplement cavity is communicated with the water outlets, a gravity sensing sewage discharge mechanism is arranged in the water outlets, the gravity sensing sewage discharge mechanism rotates with the rotating roller to change the opening degree of the water outlets, and the sponge roller body is supplied with water source.The PVC film continuous production humidifying device for plastic recycling and processing is cooperated with the gravity sensing sewage discharge mechanism, the scraping component and the absorption and discharge mechanism, waste water is prevented from flowing and dropping, the production site environment is effectively improved, the uniformity and the operation stability of PVC recycling film humidification are improved as a whole, and the processing quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of plastic recycling and processing, specifically to a humidification device for continuous production of PVC film for plastic recycling and processing. Background Technology

[0002] In the field of plastic recycling and processing, recycled PVC film is subjected to high temperatures and dry surfaces after extrusion molding, making it prone to static electricity and curling. Humidification treatment is required to ensure stable operation of continuous winding. Existing PVC film humidification devices are mostly designed for virgin films and use contact humidification rollers to achieve continuous film feeding and humidification. However, existing devices only perform humidification on the PVC film once, which can easily lead to uneven humidification, resulting in localized areas of excessive moisture and dryness, thus affecting the quality of the produced PVC film.

[0003] To address the aforementioned issues, reference can be made to the high-efficiency PVC film production humidification equipment disclosed in existing patent 1 (Chinese patent application number CN201810060871.0, application date 2018.01.22). This device achieves double humidification of the PVC film by setting up a first humidification mechanism and a second humidification mechanism, thereby increasing the humidity of the PVC film and ensuring humidification of every part of the PVC film, resulting in uniform humidification. It can also reduce the temperature of the PVC film, improving the efficiency of the subsequent cooling process and reducing the production requirements for the subsequent cooling process. Alternatively, reference can be made to an existing patent 2 (Chinese patent application number CN202121545278.9, application date 2021.07.08), which discloses a PVC film coating production humidification equipment. This device, through the cooperation of a support plate, water injection tank, water storage tank, water pipe, sealing ring, water inlet, movable rectangular box, coating component, limiting block, slide groove, and compression spring, can achieve rapid and efficient humidification. The PVC film coating process involves humidification and cooling, with automatic water replenishment. This high degree of automation saves manpower and improves work efficiency. Referring to existing patent 3 (Chinese patent application number CN201910667624.1, application date July 23, 2019), a PVC film production humidification device is described. This device applies humidification to the PVC film surface using a coating component. When excessive humidity is detected, a rotating disk is controlled to rotate, causing the guide disk on the cylindrical rod to rotate as well. This reduces the size of the cross-holes between the guide disk and the inner guide frame, effectively decreasing the amount of solution flowing to the connection port. Consequently, less solution flows from the infusion tube to the liquid tank, allowing the fine pores to gradually supply solution to the coating component. The humidified PVC film then slowly moves upwards, where a squeegee removes water droplets and impurities from the PVC film surface.

[0004] Although the above structure can achieve humidification of PVC film, there are still shortcomings in practical applications; using the water inlet chamber to supply water to the sponge roller for contact humidification makes it difficult to control the water supply, which can easily lead to excessive free water accumulation on the surface of the sponge roller; excess water is transferred to the surface of the PVC film, causing abnormal film moisture content and interfering with subsequent recycling and granulation processes; at the same time, the high-speed rotation of the sponge roller can also easily cause centrifugal water ejection, further deteriorating the production environment.

[0005] Therefore, we propose a humidification device for continuous production of PVC film for plastic recycling and processing, in order to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a humidification device for continuous production of PVC film for plastic recycling, in order to solve the problems mentioned above. The current humidification devices on the market use a water inlet chamber to supply water to the sponge roller to achieve contact humidification. However, the water supply is difficult to control, and the surface of the sponge roller is prone to accumulating too much free water. Excess water is transferred to the surface of the PVC film, causing abnormal film moisture content and interfering with subsequent recycling and granulation processes. At the same time, the high-speed rotation of the sponge roller is also prone to centrifugal water ejection, which further deteriorates the production environment.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a humidification device for continuous production of PVC film for plastic recycling, comprising a frame, a winding section provided on one side of the frame, the winding section being driven by a drive source, and a feeding section provided on the other side of the frame, the feeding section cooperating with the winding section to convey the PVC film body, the upper surface of the PVC film body being in contact with a sponge roller body, the inner side of the sponge roller body being nested and fixed to the outer side of a rotating roller, the end of the rotating roller being connected to a water inlet pipe, a scraper being provided on the outer side of the sponge roller body, the scraper being fixed to the inner side of the upper end of the frame; the roller wall of the rotating roller having several sets of water outlets at equal angles around its center, the interior of the rotating roller having a water replenishment chamber connected to the water outlets, the interior of the water outlet having a gravity-sensing water dispensing mechanism, the gravity-sensing water dispensing mechanism changing the opening of the water outlet as the rotating roller rotates, supplying water to the sponge roller body.

[0008] Preferably, the gravity-sensing water-draining mechanism includes a fixed rod fixed inside the water outlet. The outer side of the fixed rod is connected to the inner wall of the plug block through a return spring. The plug block has a hollow groove inside, and a counterweight ball is rolled inside the hollow groove.

[0009] Preferably, the plug has a frustum structure, and the outer side of the plug is fitted onto the inner wall of the outlet.

[0010] Preferably, the outer wall of the counterweight ball is adapted to the inner wall of the empty groove, and rubber pads are provided at the upper and lower ends of the inner side of the empty groove to avoid excessive impact force of the counterweight ball.

[0011] Preferably, the weight of the counterweight ball overcomes the elastic force of the return spring, and the plug forms an elastic sliding structure between the return spring and the outer side of the fixed rod.

[0012] Preferably, the outer side of the scraper is inclined and attached to the outer surface of the sponge roller body, and a collection groove is fixed on the bottom outer side of the scraper for collecting and treating the excess water squeezed out by the sponge roller body. The groove inside the collection groove is inclined toward the conveying pipe.

[0013] Preferably, a reciprocating screw is fixed at the end of the rotating roller away from the water inlet pipe. The outer side of the reciprocating screw is connected to the absorption and discharge mechanism. The absorption and discharge mechanism is used to absorb and discharge the wastewater inside the collection tank into the discharge box. The discharge box is detachably installed on the outer side of the frame.

[0014] Preferably, the absorption and discharge mechanism includes a piston rod that is driven to the outside of a reciprocating screw. The outside of the piston rod is slidably disposed inside a fixed horizontal cylinder. The outer end of the fixed horizontal cylinder is connected to a conveying pipe. The other end of the conveying pipe is connected to the outside of a collection trough. The middle part of the conveying pipe is connected to a discharge port through a tee. The discharge port is vertically oriented towards the inside of the discharge box.

[0015] Preferably, the piston rod has a square cross-section, and the outer wall of the piston rod is in contact with the inner wall of the fixed cross cylinder.

[0016] Preferably, a one-way inlet nozzle is installed on one side of the conveying pipe located in the collection tank, and a one-way outlet nozzle is provided inside the discharge port.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This humidification device for continuous production of PVC film for plastic recycling achieves stable and controllable continuous humidification through the coordinated operation of the gravity-sensing water supply mechanism, the scraper assembly, and the absorption and discharge mechanism; the gravity-sensing water supply mechanism adaptively adjusts the outlet opening according to the rotation angle of the rotating roller, ensuring sufficient water supply in the lower half of the area where the sponge roller contacts the PVC film, thus guaranteeing the humidification effect, and automatically reducing the opening in the upper half of the roller body, thereby reducing the water storage in the non-working area of ​​the sponge roller from the source and significantly suppressing the centrifugal water-throwing phenomenon caused by high-speed rotation; the inclined scraper elastically fits against the surface of the sponge roller, squeezing out excess free water from the surface of the sponge, precisely controlling the amount of water transferred to the PVC film surface, and avoiding local over-wetting of the film body from interfering with subsequent recycling granulation and other processing steps; the collection tank receives the scraped wastewater, and together with the absorption and discharge mechanism, the accumulated water is concentrated and transported to the discharge box, preventing wastewater from overflowing and dripping, effectively improving the production site environment, and comprehensively improving the uniformity and operational stability of PVC recycling film humidification, ensuring the quality of subsequent processing. Specific details are as follows: 1. The counterweight ball revolves synchronously with the rotating roller, and automatically changes the radial force by its own weight, driving the plug block to slide along the fixed rod to achieve stepless adaptive adjustment of the outlet opening. When it is in the vertical lower position, the outlet opening is the largest, ensuring sufficient water supply in the working area of ​​the sponge roller and uniform humidification of the membrane surface. When it rotates to the upper half, the opening automatically decreases, reducing ineffective water supply and water storage in the non-working area of ​​the sponge roller, greatly reducing the centrifugal water throwing phenomenon during high-speed rotation, and avoiding water droplet splashing that contaminates the equipment and membrane surface. 2. The elastic scraper is inclined and adheres to the surface of the sponge roller, which can stably squeeze and remove free water from the surface of the sponge, accurately control the humidification of the PVC film, and avoid abnormal fluctuations in the film surface moisture content that may affect subsequent recycling and granulation processes. The collection tank adopts an inclined tank design, which ensures smooth water flow and prevents sludge accumulation. With the help of a reciprocating piston absorption and discharge mechanism driven by the rotating roller itself, the collected wastewater can be centrally transported to a detachable discharge box for centralized wastewater treatment. This avoids wastewater from dripping and polluting the production site, while reducing the frequency of manual cleaning of accumulated water, ensuring the stability of continuous PVC film winding production, and reducing overall operation and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a partial front view of the frame structure of the present invention; Figure 4 This is a schematic diagram of the main structure of the sponge roller body of the present invention; Figure 5 This is a schematic diagram of the main cross-sectional structure of the rotating roller of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the main cross-sectional structure of the plug block of the present invention; Figure 8 This is a side view of the fixed cross-tube structure of the present invention; Figure 9 This is a schematic diagram of the side front view cross-sectional structure of the fixed horizontal cylinder of the present invention.

[0019] In the diagram: 1. Frame; 2. Rewinding section; 3. Drive source; 4. Feeding section; 5. PVC film body; 6. Sponge roller body; 7. Water inlet pipe; 8. Rotating roller; 801. Reciprocating screw; 9. Scraper; 901. Collection trough; 10. Discharge box; 11. Water replenishment chamber; 12. Water outlet; 13. Fixing rod; 14. Return spring; 15. Plug; 16. Empty trough; 17. Counterweight ball; 18. Piston rod; 19. Fixed cross cylinder; 20. Conveying pipe; 21. Discharge port. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-9 The present invention provides the following technical solution: Reference Appendix Figure 1 - Appendix Figure 6 A humidification device for continuous production of PVC film for plastic recycling includes a frame 1. A winding section 2 is provided on one side of the frame 1, which is driven by a drive source 3. A feeding section 4 is provided on the other side of the frame 1. The feeding section 4 cooperates with the winding section 2 to transport the PVC film body 5. The upper surface of the PVC film body 5 is in contact with a sponge roller body 6. The inner side of the sponge roller body 6 is nested and fixed to the outer side of a rotating roller 8. The end of the rotating roller 8 is connected to a water inlet pipe 7. A scraper 9 is provided on the outer side of the sponge roller body 6 and is fixed to the inner side of the upper end of the frame 1. The roller wall of the rotating roller 8 has several sets of water outlets 12 at equal angles around its center. A water replenishment chamber 11 is provided inside the rotating roller 8 and is connected to the water outlets 12. A gravity-sensing water dispensing mechanism is provided inside the water outlets 12. The gravity-sensing water dispensing mechanism changes the opening of the water outlets 12 as the rotating roller 8 rotates, thereby supplying water to the sponge roller body 6.

[0022] The drive source 3 drives the winding section 2 to rotate, which, together with the unloading section 4, pulls the PVC film body 5 to be continuously and horizontally conveyed along the frame 1. The upper surface of the PVC film body 5 is in close contact with the lower outer circumference of the sponge roller body 6, causing the sponge roller body 6 to rotate synchronously with the rotating roller 8. External water source is introduced into the water replenishment chamber 11 inside the rotating roller 8 through the water inlet pipe 7. The water in the water replenishment chamber 11 permeates outward through each set of water outlets 12 to the inner side of the sponge roller body 6, causing the sponge roller body 6 to absorb water and become moist. When the moistened sponge roller body 6 comes into contact with the PVC film body 5, it evenly transfers the moisture to the surface of the PVC film body 5, completing the continuous humidification operation. The gravity-sensing water discharge mechanism inside the water outlet 12 revolves synchronously with the rotating roller 8, and automatically changes the opening of the water outlet 12 according to the change of its own rotation angle, thereby adjusting the water output at different circumferential positions. The scraper 9 on the outside of the sponge roller body 6 is in contact with the roller surface to scrape off excess free water on the surface of the sponge, accurately controlling the amount of humidification on the film surface.

[0023] Reference Appendix Figure 5 - Appendix Figure 7 The gravity-sensing water-draining mechanism includes a fixed rod 13 fixed inside the outlet 12. The outer side of the fixed rod 13 is connected to the inner wall of the plug 15 through a return spring 14. The plug 15 has a slot 16 inside, and a counterweight ball 17 is rolled inside the slot 16. The plug 15 has a frustum structure, and the outer side of the plug 15 is fitted against the inner wall of the outlet 12.

[0024] The fixed rod 13 is radially fixedly supported inside the outlet 12, providing sliding guidance for the plug 15. When the rotating roller 8 rotates, the plug 15 and the counterweight ball 17 in the empty groove 16 revolve around the roller center together with the rotating roller 8. Under its own weight, the counterweight ball 17 rolls relative to the inner wall of the empty groove 16, changing its radial position in the empty groove 16, and thus applying different radial forces to the plug 15. When the outlet 12 rotates to the vertically downward position with the rotating roller 8, the counterweight ball 17 rolls to the outer end of the empty groove 16, pushing the plug 15 to slide outward along the fixed rod 13, increasing the opening of the outlet 12 and increasing the water output, thus fully supplying water to the working contact area of ​​the sponge roller body 6. The outer conical surface of the truncated cone structure plug 15 fits against the inner wall of the outlet 12, ensuring the sealing performance during the closing and opening adjustment process and preventing water leakage from gaps.

[0025] Reference Appendix Figure 7 The outer wall of the counterweight ball 17 is adapted to the inner wall of the empty groove 16. Rubber pads are provided at the upper and lower ends of the inner side of the empty groove 16 to avoid excessive impact force of the counterweight ball 17.

[0026] The outer wall of the counterweight ball 17 is fitted with the inner wall of the empty groove 16 to ensure that the counterweight ball 17 can roll smoothly along the empty groove 16 without jamming or deviation. The rubber pads at the upper and lower ends of the inner side of the empty groove 16 correspond to the two extreme positions of the counterweight ball 17. When the rotating roller 8 rotates to the point where the outlet 12 is rapidly switching, the counterweight ball 17 rolls rapidly to the end under the action of gravity. The rubber pads absorb the impact kinetic energy of the counterweight ball 17 through elastic deformation, avoiding direct collision of metal parts that may cause abnormal noise, wear or deformation. At the same time, the rolling stroke of the counterweight ball 17 is limited to ensure that it always moves within the empty groove 16, ensuring the stability of gravity drive and the service life of the structure.

[0027] Reference Appendix Figure 7 The weight of the counterweight ball 17 overcomes the elastic force of the return spring 14, and the plug 15 forms an elastic sliding structure between the return spring 14 and the outer side of the fixed rod 13.

[0028] The return spring 14 is preloaded and connected between the fixed rod 13 and the plug 15, providing the plug 15 with an inward restoring elastic force. The weight configuration of the counterweight ball 17 is as follows: when the outlet 12 rotates to the vertical lower position, the radial outward component force generated by the counterweight ball 17 is greater than the preload force of the return spring 14, pushing the plug 15 to slide outward along the fixed rod 13, and the outlet 12 opens to its maximum opening degree; when the outlet 12 gradually rotates away from the vertical lower position and rotates to the upper half, the radial component force of the counterweight ball 17 gradually decreases, and when it is less than the elastic force of the return spring 14, the return spring 14 pushes the plug 15 to slide inward along the fixed rod 13, and the opening degree of the outlet 12 gradually decreases; when it rotates to the upper half, the opening degree of the outlet 12 drops to the minimum, realizing the elastic sliding opening and closing effect of automatically adjusting the opening degree with the rotation angle.

[0029] Reference Appendix Figure 8 The outer side of the scraper 9 is inclined and attached to the outer surface of the sponge roller body 6. A collection groove 901 is also fixed on the bottom outer side of the scraper 9 for collecting and treating the excess water squeezed out by the sponge roller body 6. The groove inside the collection groove 901 is inclined towards the conveying pipe 20.

[0030] The scraper 9 is fixedly installed at an inclined angle, and its end is elastically attached to the outer surface of the sponge roller body 6. During the rotation of the sponge roller body 6, when it passes the position of the scraper 9, the sponge is deformed by the squeezing action of the scraper 9, and the surface free water inside the pores is squeezed out and flows down along the inclined surface of the scraper 9. The collection tank 901 is fixed to the bottom outside of the scraper 9, and the opening of the tank receives the wastewater flowing down from the scraper 9. The tank body of the collection tank 901 is inclined downward towards the conveying pipe 20, so that the collected wastewater flows automatically towards the conveying pipe 20 by gravity, realizing the gravity collection of wastewater and preventing the water in the tank from overflowing and dripping onto the PVC film surface.

[0031] Reference Appendix Figure 9 A reciprocating screw 801 is fixed at the end of the rotating roller 8 away from the water inlet pipe 7. The outer side of the reciprocating screw 801 is connected to the absorption and discharge mechanism. The absorption and discharge mechanism is used to absorb and discharge the wastewater inside the collection tank 901 into the discharge box 10. The discharge box 10 is detachably installed on the outer side of the frame 1.

[0032] When the rotating roller 8 rotates, it drives the reciprocating screw 801, which is coaxially fixed at the end, to rotate synchronously. The reciprocating screw 801 converts its own rotational motion into the axial reciprocating linear motion of the nut seat, which in turn drives the piston rod 18 of the absorption and discharge mechanism to reciprocate. The absorption and discharge mechanism changes the internal chamber volume by the reciprocating motion of the piston rod 18, generating negative pressure suction and positive pressure. The wastewater collected in the collection tank 901 is continuously extracted through the conveying pipe 20 and vertically discharged through the discharge port 21 into the discharge box 10 below for centralized storage. The discharge box 10 adopts a detachable installation structure. When it is full, it can be removed and emptied for cleaning, realizing centralized treatment of wastewater and avoiding pollution of the production site and membrane surface.

[0033] Reference Appendix Figure 3 Appendix Figure 8 and attached Figure 9 The absorption and discharge mechanism includes a piston rod 18 that is driven and connected to the outside of the reciprocating screw 801. The outside of the piston rod 18 is slidably disposed inside the fixed horizontal cylinder 19. The outer end of the fixed horizontal cylinder 19 is connected to the conveying pipe 20. The other end of the conveying pipe 20 is connected to the outside of the collection tank 901. The middle part of the conveying pipe 20 is connected to the discharge port 21 through a tee. The discharge port 21 is vertically facing the inside of the discharge box 10. The piston rod 18 has a square cross section, and the outer wall of the piston rod 18 is in contact with the inner wall of the fixed horizontal cylinder 19. A one-way water inlet is installed on one side of the conveying pipe 20 located in the collection tank 901, and a one-way water outlet is provided inside the discharge port 21.

[0034] The piston rod 18 has a square cross-section and slides against the inner wall of the fixed cross cylinder 19, ensuring both sliding sealing performance and preventing the piston rod 18 from rotating circumferentially with the reciprocating screw 801, thus ensuring stable reciprocating motion. The fixed cross cylinder 19 serves as the pump cylinder cavity, working with the piston rod 18 to achieve volume changes. The one-way inlet at the end of the delivery pipe 20 only allows water to flow unidirectionally from the collection tank 901 into the cavity of the fixed cross cylinder 19, and the one-way outlet in the discharge port 21 only allows water to flow out of the cavity. The wastewater flows out of the inward discharge box 10 in one direction. When the piston rod 18 extends outward and the volume of the chamber increases, a negative pressure is generated in the chamber. The one-way inlet nozzle opens and the one-way outlet nozzle closes. The wastewater in the collection tank 901 is sucked into the chamber through the conveying pipe 20. When the piston rod 18 retracts inward and the volume of the chamber decreases, the pressure in the chamber increases. The one-way inlet nozzle closes and the one-way outlet nozzle opens. The wastewater in the chamber is forced into the discharge box 10 through the discharge port 21, completing one suction and discharge cycle. This cycle continues to achieve automatic conveying and discharge of wastewater.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A humidification device for continuous production of PVC film for plastic recycling, comprising a frame (1), a winding section (2) provided on one side of the frame (1), the winding section (2) being driven by a drive source (3), and a feeding section (4) provided on the other side of the frame (1), the feeding section (4) cooperating with the winding section (2) to convey the PVC film body (5), characterized in that: The upper surface of the PVC film body (5) is attached to the sponge roller body (6). The inner side of the sponge roller body (6) is nested and fixed to the outer side of the rotating roller (8). The end of the rotating roller (8) is connected to the water inlet pipe (7). A scraper (9) is provided on the outer side of the sponge roller body (6). The scraper (9) is fixed to the inner side of the upper end of the frame (1). The roller wall of the rotating roller (8) is provided with several sets of water outlets (12) at equal angles around its center. A water replenishment chamber (11) is provided inside the rotating roller (8). The water replenishment chamber (11) is connected to the water outlet (12). A gravity sensing water dispensing mechanism is provided inside the water outlet (12). The gravity sensing water dispensing mechanism changes the opening degree of the water outlet (12) as the rotating roller (8) rotates, so as to supply water to the sponge roller body (6).

2. The humidification device for continuous PVC film production in plastic recycling and processing according to claim 1, characterized in that: The gravity-sensing water-draining mechanism includes a fixed rod (13) fixed inside the water outlet (12). The outer side of the fixed rod (13) is connected to the inner wall of the plug (15) through a return spring (14). The plug (15) has a slot (16) inside, and a counterweight ball (17) is rolled inside the slot (16).

3. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 2, characterized in that: The plug (15) has a frustum structure, and the outer side of the plug (15) is fitted onto the inner wall of the outlet (12).

4. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 2, characterized in that: The outer wall of the counterweight ball (17) is adapted to the inner wall of the slot (16). Rubber pads are provided at the upper and lower ends of the inner side of the slot (16) to avoid excessive impact force of the counterweight ball (17).

5. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 4, characterized in that: The weight of the counterweight ball (17) overcomes the elastic force of the return spring (14), and the plug (15) forms an elastic sliding structure between the return spring (14) and the outside of the fixed rod (13).

6. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 1, characterized in that: The outer side of the scraper (9) is inclined and attached to the outer surface of the sponge roller body (6). A collection groove (901) is also fixed on the bottom outer side of the scraper (9) for collecting and treating the excess water squeezed out by the sponge roller body (6). The groove inside the collection groove (901) is inclined toward the conveying pipe (20).

7. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 1, characterized in that: The end of the rotating roller (8) away from the water inlet pipe (7) is fixed with a reciprocating screw (801). The outer side of the reciprocating screw (801) is connected to the absorption and discharge mechanism. The absorption and discharge mechanism is used to absorb and discharge the wastewater inside the collection tank (901) into the discharge box (10). The discharge box (10) is detachably installed on the outside of the frame (1).

8. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 7, characterized in that: The absorption and discharge mechanism includes a piston rod (18) that is driven to the outside of a reciprocating screw (801). The outside of the piston rod (18) is slidably disposed inside a fixed horizontal cylinder (19). The outer end of the fixed horizontal cylinder (19) is connected to a conveying pipe (20). The other end of the conveying pipe (20) is connected to the outside of a collection trough (901). The middle part of the conveying pipe (20) is connected to a discharge port (21) through a tee. The discharge port (21) is vertically facing the inside of the discharge box (10).

9. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 8, characterized in that: The piston rod (18) has a square cross-section, and the outer wall of the piston rod (18) is in contact with the inner wall of the fixed cross cylinder (19).

10. A humidification device for continuous PVC film production in plastic recycling and processing according to claim 8, characterized in that: The conveying pipe (20) is equipped with a one-way water inlet on one side of the collection tank (901), and the discharge port (21) is equipped with a one-way water outlet inside.

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