A papermaking coating device for release paper and its process

Abstract

The present invention belongs to the technical field of release paper coating, and in particular to a papermaking coating device and process for release paper, comprising a papermaking coating machine body, a coating assembly being provided on the side of a transmission roller facing the release paper roll, the coating assembly comprising a U-shaped bracket plate installed between the inner walls of the papermaking coating machine body and covering the outer side of the transmission roller, a movable coating box slidingly installed in the U-shaped bracket plate by an oil cylinder, a coating nozzle cavity connected to the outer wall of the movable coating box, and a coating telescopic flat nozzle box connected in the coating nozzle cavity by an elastic extrusion component, the interior of the coating telescopic flat nozzle box having an inwardly sunken meniscus coating cavity opening adjacent to the outer wall of the release paper substrate on the transmission roller, and an anti-wrinkle assembly being provided behind the U-shaped bracket plate, which can utilize the extension force of the oil cylinder to pull the release paper substrate outward to prevent wrinkles. The coating area can be adjusted according to production needs without frequent shutdown adjustments, which greatly improves production flexibility and efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of release paper coating, in particular to a release paper coating device and a process thereof. Background Art

[0002] Heat-seal release paper is a viable alternative to sanitary napkin outer film. This plastic-free release paper combines heat-seal and release properties, making it a viable alternative to release films, release cloths, and traditional release paper used in sanitary napkin packaging. Replacing small wrappings with heat-seal release paper saves significant amounts of plastic and hot-melt adhesive per million sanitary napkins, contributing to environmental sustainability. Coating is a crucial step in the release paper production process, directly impacting the performance and quality of the final product. When it comes to silicone coating, precision is crucial. This requires precise, targeted silicone application, which typically requires precise coating equipment and techniques. This ensures that silicone oil or silicone-based materials are applied only where needed, avoiding unnecessary waste and potential contamination. This requires a highly controllable and accurate coating system. Most coating heads in existing coating processes rely on a fixed coating head design, which limits the positioning of the coating layer on the paper. In particular, when the coating area needs to be adjusted according to different product specifications or customer needs, it is often necessary to stop the machine to replace or manually adjust the coating device. This process is not only time-consuming and labor-intensive, but may also affect production efficiency and product consistency. At the same time, the coating meniscus is large, which not only affects the accuracy and uniformity of the coating, but may also lead to waste of raw materials and unstable quality of the finished product, reducing the coating efficiency and quality of the release paper.

[0003] After searching, the existing Chinese patent publication number is: CN214766526U. A release paper coating production line includes: an unwinder; a coating device installed on the right side of the unwinder; a drying cylinder device installed on the right side of the coating device; a pre-oven installed on the upper right side of the drying cylinder device; a hot air drying oven device installed above the pre-oven and arranged to the left; a stretching device installed on the lower left side of the hot air drying oven device; a cooling cylinder device installed on the right side of the stretching device; and a winder installed on the right side of the cooling cylinder device.

[0004] The cited patent literature also has the same problem. The coating head in the coating process mostly relies on a fixed coating head design. When the coating area needs to be adjusted according to different product specifications or customer needs, it is often necessary to stop the machine to replace or manually adjust the coating device. At the same time, the coating meniscus is large, which not only affects the accuracy and uniformity of the coating, but may also lead to waste of raw materials and unstable quality of finished products, reducing the coating efficiency and quality of the release paper. Summary of the Invention

[0005] The object of the present invention is to provide a papermaking coating device for release paper and a process thereof, so as to solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a papermaking coating device for release paper, comprising a papermaking coating machine body, a release paper roll mounted on one end of the papermaking coating machine body, and a winding roller mounted on the other end of the papermaking coating machine body, wherein a plurality of support rollers are distributed and installed in the middle of the papermaking coating machine body, and a transmission roller for transmitting the release paper substrate is rotatably installed in the interior of the papermaking coating machine body near the release paper roll;

[0007] A coating assembly is provided on the side of the conveying roller facing the release paper roll, and the coating assembly includes a U-shaped bracket plate installed between the inner walls of the papermaking coating machine and covering the outer side of the conveying roller, a movable coating box slidably installed in the U-shaped bracket plate by an oil cylinder, a coating nozzle cavity connected to the outer wall of the movable coating box, and a coating telescopic flat nozzle box connected to the coating nozzle cavity by an elastic extrusion component;

[0008] The coating telescopic flat-mouth box has an inward-sunken meniscus coating cavity adjacent to the outer wall of the release paper substrate on the transmission roller. An anti-wrinkle component is also provided behind the U-shaped bracket plate, which can use the extension force of the oil cylinder to pull the release paper substrate outward to prevent wrinkles.

[0009] Preferably, the outer walls of both sides of the U-shaped bracket plate are transversely provided with travel grooves, and a T-shaped travel rod is slidably connected to each of the travel grooves;

[0010] The T-shaped stroke rod is connected to the movable coating box through a locking bolt.

[0011] Preferably, the upper wall of the inner cavity of the coating nozzle cavity is provided with an inclined slope, and the top surface of one end of the inner cavity of the coating nozzle cavity of the coating telescopic flat nozzle box is consistent with the inclined slope.

[0012] In this solution, positioning plates are welded on both sides of the inner wall of the coating nozzle cavity, and the coating telescopic flat nozzle box is symmetrically welded with a positioning rod penetrating the positioning plate on one outer wall of the inner cavity of the coating nozzle cavity, and the elastic extrusion component includes an extrusion spring;

[0013] The extrusion spring is sleeved on the peripheral side of the positioning rod and is located between the coating telescopic flat mouth box and the positioning plate.

[0014] Preferably, the top surface of the coating telescopic flat mouth box facing away from the inclined slope is a horizontal plane, and a coating discharge port is longitudinally opened on the horizontal plane and at one end close to the inclined slope;

[0015] A coating flow channel communicating with the inner sunken meniscus coating cavity is provided inside the coating telescopic flat mouth box, and the coating discharge port is connected to the coating flow channel.

[0016] Preferably, a residual material receiving flow channel is provided below the coating flow channel and inside the coating telescopic flat-mouth box, and the tail end of the residual material receiving flow channel is connected to the mobile coating box through a hose;

[0017] An arc-shaped supporting end portion is provided at one end of the residual material receiving flow channel away from the coating nozzle cavity, and the arc-shaped supporting end portion is in frictional contact with the release paper substrate.

[0018] This solution is preferred, in which two rectangular brackets are symmetrically installed on the top surface of the middle workbench of the papermaking coating machine body, and a double-headed screw with external threaded paths with opposite thread directions at both ends is rotatably installed between the top ends of the two rectangular brackets, and the circumferential sides of the two external threaded paths of the double-headed screw are penetrated by movable connecting rods.

[0019] Preferably, the anti-wrinkle assembly includes a U-shaped clamping rod integrally connected to the free end of the movable connecting rod and two clamping rollers rotatably mounted in each U-shaped clamping rod;

[0020] The two adjacent clamping roller pairs are clamped on the end side surface of the release paper substrate.

[0021] Preferably, an L-type push-pull rod is installed on the bottom surface of the mobile coating box for lifting, the free end of the L-type push-pull rod is fixedly connected to a worm, and a worm wheel meshing with the worm is fixedly installed in the middle position of the double-headed screw.

[0022] A papermaking coating process for release paper comprises the following steps:

[0023] S1, loading the release paper roll onto one end of the paper coating machine body, and preparing a take-up roller at the other end of the paper coating machine body, unwinding the release paper substrate from the release paper roll via a support roller, and transferring it via a transfer roller;

[0024] S2, the piston rod of the oil cylinder drives the movable coating box to slide along the U-shaped bracket plate, so that the two positioning steel balls on the outer wall of the coating telescopic flat nozzle box roll against the outer wall of the conveying roller, while ensuring that the coating telescopic flat nozzle box is aligned with the release paper substrate being conveyed;

[0025] S3, as the piston rod of the oil cylinder continues to advance, the coating telescopic flat nozzle box squeezes and contracts the extrusion spring in the coating nozzle cavity, so that the coating discharge port is retracted into the coating nozzle cavity and a feeding cavity is formed between the inclined slope;

[0026] S4, the coating enters the coating discharge port from the feeding cavity, passes through the coating flow channel and the inner-sunk meniscus coating cavity, and is sprayed onto the surface of the release paper substrate during the transmission process;

[0027] S5, when the piston rod of the oil cylinder in S drives the mobile coating box to extend, the worm is driven by the push-pull rod L to move toward the transmission roller, so that the worm engages with the worm wheel;

[0028] S6, when the worm gear rotates, the double-headed screw drives the two movable connecting rods and the U-shaped clamping rod to move in opposite directions under the action of the two external thread teeth with opposite thread directions, so that the two adjacent clamping rollers clamping the release paper substrate move backward, thereby generating an outward pulling force on the release paper substrate to prevent the release paper substrate from wrinkling inward;

[0029] S7, when the coating is completed, the piston rod of the oil cylinder drives the movable coating box to retract and retreat, at which time the L push-pull rod rises and disengages from the worm gear so that the release paper substrate remains in a state of being clamped and pulled by the rollers to prevent wrinkles;

[0030] S8, as the mobile coating box shrinks and retreats, the positioning steel ball of the coating telescopic flat nozzle box separates from the transmission roller. At the moment when the extrusion spring loses its extrusion force, the reaction force pushes the coating telescopic flat nozzle box to extend, and the coating discharge port comes out of the coating sharp nozzle cavity, thereby no longer conveying paint and stopping coating.

[0031] Compared with the prior art, the technical effects and advantages of the present invention are:

[0032] This release paper coating device uses a cylinder-driven piston rod that slides along a U-shaped support plate, enabling rapid and precise adjustment of the coating position. This allows the coating area to be flexibly adjusted according to production needs without frequent machine downtime for adjustments, significantly improving production flexibility and efficiency. Simultaneously, the piston rod's advancement controls the expansion and contraction of the coating spout, ensuring a uniform and precise coating layer.

[0033] The precise coordination of the inclined slope inside the coating nozzle cavity with the positioning rod and elastic extrusion component (extrusion spring) of the coating telescopic flat nozzle box not only ensures the uniform flow of the coating, but also achieves precise control of the coating nozzle. The coating telescopic flat nozzle box can automatically adjust the size of the meniscus according to the set coating requirements, effectively reducing the waste of coating and improving the uniformity and quality of the coating layer; the sunken structure of the inner-sunken meniscus coating cavity reduces the meniscus phenomenon commonly seen in traditional coating, helps control the flow and distribution of coating, improves the uniformity and quality of the coating layer, and also reduces the waste of raw materials;

[0034] The anti-wrinkle assembly's U-shaped clamping rod is connected to a double-threaded screw via a moving connecting rod. The clamping rollers are mounted within the U-shaped rod. As the double-threaded screw rotates, the moving connecting rod drives the U-shaped clamping rod and its attached clamping rollers to move sideways, gently stretching the release paper substrate and preventing wrinkles during coating and conveying. This dynamic adjustment ensures the paper's straightness, improving the finished product's appearance and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 This is a schematic structural diagram of the connection state of the U-shaped bracket plate and the paper coating machine body of the present invention;

[0038] Figure 3 This is a schematic structural diagram of the connection state of the mobile coating box and the double-headed screw of the present invention;

[0039] Figure 4 This is a structural schematic diagram of the mobile coating box and the coating nozzle cavity of the present invention in an installed state;

[0040] Figure 5 This is a schematic structural diagram of the connection state of the coating pointed nozzle cavity and the coating telescopic flat nozzle box of the present invention;

[0041] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at A in the middle;

[0042] Figure 7 This is a schematic structural diagram of the connection state of the clamping roller pair and the U-shaped clamping rod of the present invention;

[0043] Figure 8 This is a schematic structural diagram of the connection state of the movable connecting rod and the external thread path of the present invention;

[0044] Figure 9 It is a schematic structural diagram of the worm wheel and worm engaged together in the present invention;

[0045] Figure 10 It is a cross-sectional view of the coating pointed nozzle cavity and the coating telescopic flat nozzle box of the present invention;

[0046] Figure 11 It is a structural schematic diagram of the coated telescopic flat-mouth box of the present invention in the retracted and contracted state.

[0047] Description of reference numerals:

[0048] Figure: 1. Paper coating machine body; 2. Release paper roll; 3. Conveyor rack; 4. Release paper substrate; 5. Support roller; 6. U-shaped support plate; 7. Intermediate workbench; 8. Anti-wrinkle assembly; 9. Coating assembly; 10. Winding roller;

[0049] 11. Rectangular bracket; 12. Clamping rollers; 13. Removable top cover; 14. Mobile coating box; 15. Coating nozzle cavity; 16. Coating telescopic flat nozzle box; 17. Double-headed screw; 18. L push-pull rod; 19. Oil cylinder; 20. Piston rod;

[0050] 21. T-type travel rod; 22. Locking bolt; 23. Travel slot; 24. Residual material receiving channel; 25. Coating discharge port; 26. Inner-sunk meniscus coating cavity port; 27. Coating channel; 28. Positioning steel ball; 29. ​​U-shaped clamping rod; 30. Moving connecting rod;

[0051] 31. Worm gear; 32. Positioning crossbar; 33. Limiting ring; 34. Ball bearing; 35. Worm; 36. Hydraulic lift rod; 37. Transmission roller; 38. Positioning plate; 39. Extrusion spring; 40. Positioning rod;

[0052] 41. Arc-shaped support end; 42. Feed cavity; 43. Inclined slope; 44. External thread; 45. Hose. DETAILED DESCRIPTION

[0053] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0054] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside shown in the figures of the present invention, and are explained here together.

[0055] This embodiment provides Figures 1 to 11 The papermaking coating device shown in the figure comprises a papermaking coating machine body 1, a release paper roll 2 installed at one end of the papermaking coating machine body 1, and a winding roller 10 installed at the other end of the papermaking coating machine body 1. A plurality of support rollers 5 are distributed and installed in the middle of the papermaking coating machine body 1. A transmission roller 37 for transmitting the release paper substrate 4 is rotatably installed inside the end of the papermaking coating machine body 1 close to the release paper roll 2. A conveying rack rod 3 for conveying the release paper substrate 4 after it is unfolded from the release paper roll 2 is installed on the side of the release paper roll 2 facing the U-shaped bracket plate 6 and between the inner walls of the papermaking coating machine body 1 on both sides.

[0056] A coating assembly 9 is provided on the side of the transmission roller 37 facing the release paper roll 2. The coating assembly 9 includes a U-shaped bracket plate 6 installed between the inner walls of the papermaking coating machine body 1 and covering the outside of the transmission roller 37, a movable coating box 14 slidingly installed in the U-shaped bracket plate 6 through a cylinder 19, a coating nozzle cavity 15 connected to the outer wall of the mobile coating box 14, and a coating telescopic flat nozzle box 16 connected to the coating nozzle cavity 15 through an elastic extrusion component. A detachable top cover 13 is installed on the top surface of the mobile coating box 14 by bolts.

[0057] In this embodiment, the mobile coating box 14 is mounted within the U-shaped support plate 6. A piston rod 20, driven by a hydraulic cylinder 19, slides along the U-shaped support plate 6, enabling rapid and precise adjustment of the coating position. This allows the coating area to be flexibly adjusted according to production needs without frequent downtime for adjustments, significantly improving production flexibility and efficiency. Simultaneously, the advancement of the piston rod 20 controls the telescopic movement of the coating flat-mouth box 16, ensuring a uniform and precise coating layer.

[0058] In this embodiment, the outer walls of the U-shaped support plate 6 are transversely defined with travel slots 23. Each travel slot 23 is slidably connected to a T-shaped travel rod 21, which is connected to the mobile coating box 14 via locking bolts 22. The T-shaped travel rods 21 are mounted on either side of the U-shaped support plate 6 via the travel slots 23 and connected to the mobile coating box 14 via locking bolts 22. Together, these guides and locks the position of the coating assembly 9, ensuring that the mobile coating box 14 remains stable and precisely positioned during sliding. This allows for rapid adjustment of the coating area, improving production flexibility and coating accuracy.

[0059] In this embodiment, an inclined slope 43 is provided on the upper wall of the inner cavity of the coating nozzle cavity 15, and the top surface of the coating telescopic flat nozzle box 16 at one end of the inner cavity of the coating nozzle cavity 15 is consistent with the inclined slope 43. The interior of the coating telescopic flat nozzle box 16 has an inner sunken meniscus coating cavity opening 26 adjacent to the outer wall of the release paper substrate 4 on the transmission roller 37. The top surface of the side of the coating telescopic flat nozzle box 16 facing away from the inclined slope 43 is a horizontal plane, and a coating discharge port 25 is longitudinally opened on this horizontal plane and close to one end of the inclined slope 43. A coating flow channel 27 for communication with the inner sunken meniscus coating cavity opening 26 is provided inside the coating telescopic flat nozzle box 16, and the coating discharge port 25 passes through the coating flow channel 27.

[0060] In this embodiment, the coating nozzle cavity 15 serves as the channel for discharging the coating material. An internally designed inclined ramp 43 precisely coordinates with the positioning rod 40 and the elastic extrusion spring 39 of the coating retractable flat nozzle box 16, ensuring uniform coating flow and enabling precise control of the coating nozzle. The coating retractable flat nozzle box 16 automatically adjusts the size of the meniscus according to the set coating requirements, effectively reducing coating waste and improving the uniformity and quality of the coating layer.

[0061] In this embodiment, the coating discharge port 25 is located at the top of the coating telescopic flat nozzle box 16 and is a direct channel for coating spraying. By cooperating with the coating flow channel 27, the coating is evenly and stably applied to the release paper substrate 4, thereby improving coating accuracy and reducing material consumption. The coating flow channel 27 serves as a transmission channel for the coating from the mobile coating box 14 to the coating discharge port 25, ensuring smooth flow and uniform distribution of the coating, which is crucial for maintaining the uniformity of the coating layer.

[0062] In this embodiment, the inward-sunken meniscus coating cavity 26 is arranged inside the coating telescopic flat-mouth box 16. Its inward-sunken structure reduces the meniscus phenomenon commonly seen in traditional coating, helps to control the flow and distribution of the coating, improves the uniformity and quality of the coating layer, and also reduces the waste of raw materials.

[0063] In this embodiment, the positioning steel ball 28 is installed on the outer wall of the coating telescopic flat-mouth box 16, and contacts the transmission roller 37 during the coating operation, ensuring the precise alignment of the coating telescopic flat-mouth box 16 and the paper, improving the positioning accuracy of the coating, and avoiding uneven coating or paper damage due to misalignment. When the transmission roller 37 rotates, the positioning steel ball 28 is in rolling friction contact with the transmission roller 37.

[0064] In this embodiment, positioning plates 38 are welded to the inner walls on both sides of the coating nozzle cavity 15, and the coating telescopic flat nozzle box 16 is symmetrically welded with a positioning rod 40 that passes through the positioning plate 38 on an outer wall of the inner cavity of the coating nozzle cavity 15. The elastic extrusion component includes an extrusion spring 39, which is sleeved on the side of the positioning rod 40 and located between the coating telescopic flat nozzle box 16 and the positioning plate 38.

[0065] In this embodiment, two rectangular brackets 11 are symmetrically welded with positioning cross bars 32 on opposite sides and on both sides of the double-headed screw 17, and each positioning cross bar 32 passes horizontally through the adjacent movable connecting rod 30, so that when the movable connecting rod 30 is driven by the double-headed screw 17, the positioning cross bar 32 can position the movement of the movable connecting rod 30.

[0066] In this embodiment, a residual material receiving channel 24 is provided below the coating channel 27 and within the coating retractable flat nozzle box 16. The tail end of the residual material receiving channel 24 is connected to the mobile coating box 14 via a hose 45. The end of the residual material receiving channel 24, away from the coating nozzle cavity 15, is provided with an arcuate support end 41, which is in frictional contact with the release paper substrate 4. The residual material receiving channel 24 is located within the coating retractable flat nozzle box 16 and connected to the mobile coating box 14 via a hose 45. This function collects residual coating after the coating operation, reducing waste and facilitating recirculation and reuse. This not only improves material utilization but also helps maintain a clean working environment and reduces cleaning and maintenance workload.

[0067] In this embodiment, the arc-shaped support end portion 41 is located at the end of the residual material receiving channel 24 away from the coating nozzle cavity 15. The arc-shaped design adapts to the contour of the release paper substrate 4, reduces the friction resistance of the direct contact surface, ensures that the release paper substrate 4 is smoother when passing through, reduces potential damage and wrinkles, and at the same time supports the stability of the residual material receiving channel 24, allows the coating residue to be discharged smoothly, and keeps the coating area clean.

[0068] In this embodiment, the feed channel 42 is a temporary cavity formed in the coating nozzle cavity 15. When the coating telescopic flat nozzle box 16 is compressed during the coating operation, the coating discharge port 25 is retracted into the coating nozzle cavity 15 and between the inclined slope 43, forming a feed channel 42, which is conducive to the formation of a buffer area before the coating enters the coating discharge port 25, ensuring that the coating flows more stably and evenly, reducing splashing and uneven coating, and improving the uniformity and aesthetics of the coating.

[0069] In this embodiment, the inclined ramp 43 is an inclined structure provided on the inner wall of the coating nozzle cavity 15, which contacts the top of the coating telescopic flat nozzle box 16 and guides the coating to smoothly transition to the coating discharge port 25. The design of the inclined ramp 43 helps the coating to form a good flow state during coating, reduces coating accumulation and dripping, improves coating continuity and uniformity of surface coverage, and thus improves the quality of the final product.

[0070] In this embodiment, two rectangular brackets 11 are symmetrically installed on the top surface of the middle workbench 7 of the papermaking coating machine body 1, and a double-headed screw 17 with an external threaded path 44 with opposite thread directions at both ends is rotatably installed between the top ends of the two rectangular brackets 11. The two external threaded paths 44 of the double-headed screw 17 are both connected to the circumference of the two external threaded paths 44 of the double-headed screw 17. A movable connecting rod 30 is connected therethrough. An anti-wrinkle component 8 is also provided behind the U-shaped bracket plate 6, which can utilize the stretching force of the oil cylinder 19 to pull the release paper substrate 4 outward to prevent wrinkles. The anti-wrinkle component 8 includes a U-shaped clamping rod 29 respectively integrally connected to the free end of the movable connecting rod 30 and two clamping rollers 12 respectively rotatably installed in each U-shaped clamping rod 29, and the two adjacent clamping rollers 12 are clamped on the end side surface of the release paper substrate 4.

[0071] In this embodiment, a limit ring 33 is welded at the outer wall of the double-headed screw 17 at the opposite end of the two external threaded paths 44. The limit ring 33 can limit the moving stroke of the movable connecting rod 30 to prevent it from exceeding the stroke; ball bearings 34 are interference fit at the two end rods of the double-headed screw 18, and the ball bearings 34 are embedded in the rectangular bracket 11, thereby facilitating the rotation of the double-headed screw 17.

[0072] In this embodiment, a rectangular bracket 11 is mounted in the middle of the paper coating machine body 1, providing a stable mounting platform for the double-threaded screw 17. The double-threaded screw 17, with its threads running in opposite directions at its ends, connects to the movable connecting rod 30. Rotation of the double-threaded screw 17 precisely controls the movement of the movable connecting rod 30 in opposite directions or toward the center. This allows the wrinkle-preventing assembly 8 to precisely pull the release paper substrate 4, effectively preventing wrinkles during the coating process and maintaining a smooth paper surface.

[0073] In this embodiment, in the wrinkle-preventing assembly 8, a U-shaped clamping rod 29 is connected to the double-ended screw 17 via a movable connecting rod 30. The clamping rollers 12 are mounted within the U-shaped clamping rod 29. When the double-ended screw 17 rotates, the movable connecting rod 30 drives the U-shaped clamping rod 29 and the clamping rollers 12 mounted thereon to move sideways, appropriately stretching the release paper substrate 4 and preventing wrinkles during coating and conveying. This dynamic adjustment ensures the straightness of the paper, improving the appearance quality and performance of the finished product.

[0074] In this embodiment, an L-shaped push-pull rod 18 is installed on the bottom surface of the mobile coating box 14 for lifting and lowering. The free end of the L-shaped push-pull rod 18 is fixedly connected to a worm 35, and a worm wheel 31 is fixedly installed in the middle position of the double-headed screw 17, which is engaged with the worm 35. A hydraulic lift rod 36 is installed on the top surface of the end of the L-shaped push-pull rod 18 away from the worm 35 by screws, and the tail end seat of the hydraulic lift rod 36 is installed on the bottom surface of the mobile coating box 14 by screws, thereby facilitating the hydraulic lift rod 36 to drive the worm 35 to rise and fall and engage and disengage with the worm wheel 31.

[0075] A papermaking coating process for release paper comprises the following steps:

[0076] S1, the release paper roll 2 is loaded onto one end of the paper coating machine body 1, and the take-up roller 10 is prepared at the other end of the paper coating machine body 1, and the release paper substrate 4 is unwound from the release paper roll 2 by the support roller 5 and transported by the transport roller 37;

[0077] S2, the piston rod 20 of the oil cylinder 19 drives the movable coating box 14 to slide along the U-shaped bracket plate 6, so that the two positioning steel balls 28 on the outer wall of the coating telescopic flat nozzle box 16 roll and abut against the outer wall of the conveying roller 37, while ensuring that the coating telescopic flat nozzle box 16 is aligned with the release paper substrate 4 being conveyed;

[0078] S3, as the piston rod 20 of the oil cylinder 19 continues to advance, the coating telescopic flat nozzle box 16 squeezes and contracts the extrusion spring 39 in the coating nozzle cavity 15, so that the coating discharge port 25 retracts into the coating nozzle cavity 15 and forms a feeding cavity 42 between the inclined slope 43;

[0079] S4, the coating enters the coating discharge port 25 from the feeding cavity 42, and is sprayed onto the surface of the release paper substrate 4 during the transmission process through the coating flow channel 27 and the inner-sunk meniscus coating cavity 26;

[0080] S5, in S2, when the piston rod 20 of the oil cylinder 19 drives the movable coating box 14 to extend, the worm 35 is driven by the L push-pull rod 18 to move toward the transmission roller 37, so that the worm 35 engages with the worm wheel 31;

[0081] S6, when the worm gear 31 rotates, the double-headed screw 17 drives the two movable connecting rods 30 and the U-shaped clamping rod 29 to move in opposite directions under the action of the two external threaded paths 44 with opposite thread directions, so that the two adjacent clamping rollers 12 clamping the release paper substrate 4 move backward, thereby generating an outward pulling force on the release paper substrate 4 to prevent the release paper substrate 4 from wrinkling inward;

[0082] S7, when the coating is completed, the piston rod 20 of the oil cylinder 19 drives the movable coating box 14 to retract and retreat. At this time, the L push-pull rod 18 rises and disengages from the worm gear 31, so that the release paper substrate 4 remains in the state of being clamped and pulled by the clamping roller 12 to prevent wrinkles;

[0083] S8, as the mobile coating box 14 shrinks and retreats, the positioning steel ball 28 of the coating telescopic flat nozzle box 16 separates from the transmission roller 37, and the reaction force at the moment when the extrusion spring 39 loses the extrusion force pushes the coating telescopic flat nozzle box 16 to extend, and the coating discharge port 25 comes out of the coating pointed nozzle cavity 15, thereby no longer conveying paint and stopping coating.

[0084] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "including an element defined by ... does not exclude the presence of other identical elements in the process, method, article or device that includes the element."

[0085] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A papermaking coating device for release paper, comprising a papermaking coating machine body (1), a release paper roll (2) mounted at one end of the papermaking coating machine body (1), and a winding roller (10) mounted at the other end of the papermaking coating machine body (1), wherein a plurality of support rollers (5) are distributed and mounted in the middle of the papermaking coating machine body (1), and characterized in that: A transmission roller (37) for transmitting the release paper substrate (4) is rotatably installed inside one end of the paper coating machine body (1) close to the release paper roll (2); A coating assembly (9) is provided on the side of the transmission roller (37) facing the release paper roll (2), and the coating assembly (9) comprises a U-shaped bracket plate (6) installed between the inner walls of the papermaking coating machine body (1) and covering the outer side of the transmission roller (37), a movable coating box (14) slidably installed in the U-shaped bracket plate (6) through an oil cylinder (19), a coating nozzle cavity (15) connected to the outer wall of the movable coating box (14), and a coating telescopic flat nozzle box (16) connected to the coating nozzle cavity (15) through an elastic extrusion component; The coating telescopic flat mouth box (16) has an inner sunken meniscus coating cavity (26) adjacent to the outer wall of the release paper substrate (4) on the transmission roller (37), and an anti-wrinkle component (8) capable of pulling the release paper substrate (4) outward to prevent wrinkles by utilizing the stretching force of the oil cylinder (19) is also provided behind the U-shaped bracket plate (6); The upper wall of the inner cavity of the coating nozzle cavity (15) is provided with an inclined slope (43), the top surface of one end of the inner cavity of the coating nozzle cavity (15) of the coating telescopic flat nozzle box (16) matches the inclined slope (43), and positioning plates (38) are welded on both sides of the inner wall of the coating nozzle cavity (15), and the coating telescopic flat nozzle box (16) is symmetrically welded with a positioning rod (40) passing through the positioning plate (38) on an outer wall of the inner cavity of the coating nozzle cavity (15), and the elastic extrusion component includes an extrusion spring (39), which is sleeved on the circumference of the positioning rod (40) and is located between the coating telescopic flat nozzle box (16) and the positioning plate (38), and the top surface of the coating telescopic flat nozzle box (16) on the side facing away from the inclined slope (43) is a horizontal surface. A coating discharge port (25) is longitudinally provided on the horizontal plane and at one end close to the inclined slope (43), and a coating flow channel (27) is provided inside the coating telescopic flat nozzle box (16) for communicating with the inner sunken meniscus coating cavity (26), the coating discharge port (25) passes through the coating flow channel (27), and a residual material receiving flow channel (24) is provided below the coating flow channel (27) and inside the coating telescopic flat nozzle box (16), the tail end of the residual material receiving flow channel (24) is connected to the movable coating box (14) through a hose (45), and an arc-shaped support end (41) is provided at one end of the residual material receiving flow channel (24) away from the coating pointed nozzle cavity (15), and the arc-shaped support end (41) is in friction contact with the release paper substrate (4); Two rectangular brackets (11) are symmetrically mounted on the top surface of the middle workbench (7) of the papermaking coating machine body (1). A double-headed screw (17) having external threaded paths (44) with opposite thread directions at both ends is rotatably mounted between the top ends of the two rectangular brackets (11). The two external threaded paths (44) of the double-headed screw (17) are both connected to the peripheral sides of the two external threaded paths (44) of the double-headed screw (17). The anti-wrinkle component (8) includes a U-shaped clamping member integrally connected to the free end of the movable connecting rod (30). The rod (29) and two clamping rollers (12) are rotatably mounted in each U-shaped clamping rod (29), and the two adjacent clamping rollers (12) are clamped on the end side surface of the release paper substrate (4). The bottom surface of the mobile coating box (14) is lifted and lowered with an L push-pull rod (18), the free end of the L push-pull rod (18) is fixedly connected to a worm (35), and the middle position of the double-headed screw (17) is fixedly mounted with a worm gear (31) meshing with the worm (35).

2. The release paper coating device according to claim 1, characterized in that: Both outer walls of the U-shaped bracket plate (6) are transversely provided with travel slots (23), and a T-shaped travel rod (21) is slidably connected to each of the travel slots (23); The T-shaped travel rod (21) is connected to the movable coating box (14) via a locking bolt (22).

3. The coating process of the release paper coating device according to any one of claims 1-2, characterized in that: The following steps are involved: S1, loading the release paper roll (2) onto one end of the paper coating machine body (1), and preparing a take-up roller (10) at the other end of the paper coating machine body (1), unwinding the release paper substrate (4) from the release paper roll (2) via a support roller (5), and transmitting the unwinding paper substrate (4) via a transmission roller (37); S2, the piston rod (20) of the oil cylinder (19) drives the movable coating box (14) to slide along the U-shaped bracket plate (6), so that the two positioning steel balls (28) on the outer wall of the coating telescopic flat nozzle box (16) roll against the outer wall of the transmission roller (37), while ensuring that the coating telescopic flat nozzle box (16) is aligned with the release paper substrate (4) being transmitted; S3, as the piston rod (20) of the oil cylinder (19) continues to advance, the coating telescopic flat nozzle box (16) squeezes and contracts the extrusion spring (39) in the coating sharp nozzle cavity (15), so that the coating discharge port (25) retracts into the coating sharp nozzle cavity (15) and forms a feeding cavity (42) between the inclined slope (43); S4, the coating material enters the coating discharge port (25) from the feeding cavity (42), and is sprayed onto the surface of the release paper substrate (4) during the transmission process through the coating flow channel (27) and the inner-sunk meniscus coating cavity (26); S5, when the piston rod (20) of the oil cylinder (19) in S2 drives the movable coating box (14) to extend, the worm (35) is driven to move toward the transmission roller (37) through the L push-pull rod (18), so that the worm (35) engages with the worm wheel (31); S6, when the worm wheel (31) rotates, the double-headed screw (17) drives the two movable connecting rods (30) and the U-shaped clamping rod (29) to move in opposite directions under the action of the two external threaded tooth paths (44) with opposite thread directions, so that the two adjacent clamping rollers (12) clamping the release paper substrate (4) move backward, thereby forming an outward pulling force to prevent the release paper substrate (4) from wrinkling inward; S7, when the coating is completed, the piston rod (20) of the oil cylinder (19) drives the movable coating box (14) to retract and retreat, and at this time the L push-pull rod (18) rises and disengages from the worm gear (31) so that the release paper substrate (4) remains in a state of being clamped and pulled by the clamping roller (12) to prevent wrinkles; S8, as the movable coating box (14) shrinks and retreats, the positioning steel ball (28) of the coating telescopic flat mouth box (16) is separated from the transmission roller (37), and the reaction force at the moment when the extrusion spring (39) loses the extrusion force pushes the coating telescopic flat mouth box (16) to extend, and the coating discharge port (25) comes out of the coating sharp mouth cavity (15), thereby no longer conveying paint and stopping coating.

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