A release paper coating apparatus

Abstract

This utility model relates to the field of release paper manufacturing technology, and discloses a release paper coating device, aiming to solve the problems of existing equipment lacking real-time tension detection and dynamic braking during paper feeding, fixed coating roller height, and lack of tension monitoring throughout the process, resulting in thin paper breakage, thick paper loosening, uneven coating, and low product qualification rate. The device includes a base plate, a paper feeding module, a coating module, and a paper receiving module, with an optional straightening and feeding module. The paper feeding module includes a feeding roller, a first servo motor, a first tension sensor, and a magnetic powder brake to achieve dynamic adjustment of unwinding tension. The coating module includes a coating roller, a third servo motor, a lead screw, and a second tension sensor, which can flexibly adjust the coating pressure and monitor the coating tension. The paper receiving module includes a receiving roller and drying equipment to complete the drying and winding of the release paper. The straightening and feeding module can eliminate wrinkles in the raw paper. This device can improve coating uniformity and product qualification rate, reduce operational complexity, and is adaptable to different production scales.

Description

Technical Field

[0001] This utility model relates to the field of release paper manufacturing technology, and in particular to a release paper coating device. Background Technology

[0002] Release paper, a functional substrate with high temperature resistance, moisture resistance, and oil resistance, is widely used in food packaging, pharmaceutical labeling, high-speed automatic labeling, self-adhesive substrates, and laser anti-counterfeiting labels due to its dense and uniform texture, excellent internal strength, and light transmittance. The coating process is the core step in release paper production, requiring the uniform application of release agents such as silicone oil and acrylic resin to its surface. The uniformity and adhesion of the coating directly determine the release paper's peelability and stability in use.

[0003] Existing release paper coating equipment lacks real-time tension detection components and dynamic braking adjustment structures in the paper feeding stage. Operators often rely on experience to control the tension, leading to frequent breakage of thin release paper due to excessive tension and loosening and shifting of thick release paper due to insufficient tension, which cannot guarantee the stability of the base paper conveying. In the coating stage, the height of the coating roller is mostly fixed, and it is impossible to flexibly adjust its contact pressure with the paper surface according to the thickness of the release paper. When coating thick paper, local missed coating is easily caused by insufficient pressure, while thin paper is easily damaged and deformed by overpressure, which directly affects the uniformity of the coating. At the same time, the tension monitoring of existing equipment is mostly limited to a single stage and cannot capture the tension fluctuations of the entire process of paper feeding and coating in real time. During the transmission and coating process, the release paper is prone to stretching and wrinkling due to tension imbalance, ultimately resulting in a low product qualification rate. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a release paper coating device, which aims to improve the problem that existing release paper coating equipment lacks real-time tension detection components and dynamic braking adjustment structures, making it impossible to capture tension fluctuations throughout the entire paper feeding and coating process in real time, resulting in a low product qualification rate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a release paper coating device, comprising a base plate, a paper feeding module, a coating module, and a paper receiving module; the paper feeding module includes two paper feeding supports and a paper feeding roller, the two paper feeding supports being fixed to the base plate, the rotating shaft of the paper feeding roller being rotatably mounted within the two paper feeding supports, one end of which is fixedly connected to the output shaft of a first servo motor, and a first tension sensor and a magnetic powder brake are sleeved on the rotating shaft of the paper feeding roller; the coating module is located downstream of the paper feeding module and includes a coating support, the coating support being fixed to the base plate. On the plate, a slider is fixed at its upper part, and the sliding plate is slidably connected to the slider through a groove opened on it; a third servo motor is fixed above the coating bracket, and its output shaft is fixedly connected to one end of a lead screw, the other end of which cooperates with the sliding plate; a coating roller is rotatably mounted on the sliding plate, one end of the rotating shaft of the coating roller is fixedly connected to the output shaft of a second servo motor, and a second tension sensor is sleeved on its rotating shaft; a material trough is provided directly below the coating roller; the paper receiving module includes a paper receiving roller and a drying device, the drying device being located downstream of the coating roller and the paper receiving roller being located downstream of the drying device.

[0006] Preferably, the system further includes a straightening and feeding module, which is located between the paper feeding module and the coating module. The module includes feeding brackets, four of which are fixed to the base plate in pairs. A sliding groove is provided on the opposite side of each feeding bracket. A lower feeding plate and an upper feeding plate are provided between every two opposing feeding brackets. The lower feeding plate is fixed to the base plate, and the upper feeding plate is slidably connected to the sliding groove. An adjusting plate is fixedly connected to the upper ends of both upper feeding plates, and the adjusting plate is slidably connected to the sliding groove. Springs are fixedly connected to both ends of the bottom surface of any upper feeding plate, and the lower ends of the springs are fixedly connected to the bottom end of the sliding groove. Two parallel lower feeding rollers are rotatably installed between each group of lower feeding plates, and two adjacent upper feeding rollers are rotatably installed between each group of upper feeding plates. The release paper passes between the lower feeding rollers and the upper feeding rollers.

[0007] Preferably, the two lower feed plates are connected by belts, the two upper feed plates are connected by belts, the upper feed plate on one side is connected to the corresponding lower feed plate on the other side by a cross belt, and the upper feed plate on the other side is connected to the paper feed roller on the other side by a belt, so that the paper feed roller can simultaneously drive the two upper feed rollers and the two lower feed rollers to rotate in a preset direction.

[0008] Preferably, both ends of the upper feeding plate and the adjusting plate are provided with protrusions that are adapted to the sliding groove of the feeding bracket, and the protrusions slide in cooperation with the sliding groove.

[0009] Preferably, one end of the release paper is wound around the paper feed roller, passes sequentially below the coating roller, above the material trough, and inside the drying equipment, and the other end is wound around the paper take-up roller.

[0010] Preferably, a guide post is coaxially arranged inside the spring, the spring is sleeved outside the guide post, and guide grooves are opened on the feeding bracket and the upper feeding plate at the positions corresponding to the guide post. The two ends of the guide post are fixed in the two guide grooves.

[0011] Preferably, the spring is a compression spring, which gives the upper feed plate an upward tendency.

[0012] Preferably, the material trough is located on the base plate, and the height of the material trough is adapted to the vertical sliding of the coating roller to ensure that the coating roller does not detach from the material trough when sliding upward.

[0013] Preferably, the end of the lead screw away from the third servo motor is rotatably connected to the coating bracket via a bearing seat, and both ends of the rotating shaft of the coating roller are rotatably connected to the sliding plate via bearings.

[0014] Preferably, the first tension sensor, the magnetic powder brake, and the second tension sensor are all electrically connected to an external controller.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the first tension sensor and the magnetic powder brake work together with the first servo motor to monitor and dynamically adjust the unwinding tension in real time, avoiding the problem of thin release paper breaking due to excessive tension and thick release paper loosening due to insufficient tension, thus ensuring the stability of the raw paper conveying. The coating module drives the lead screw of the third servo motor to move the sliding plate up and down, which can flexibly adjust the contact pressure between the coating roller and the release paper, adapting to the coating requirements of release paper of different thicknesses, and solving the problem of thick paper missing coating and thin paper damage caused by the fixed coating pressure of traditional equipment. At the same time, the first tension sensor and the second tension sensor form a full-process tension monitoring, which can correct the tension fluctuations in the unwinding and coating stages in a timely manner, reduce the stretching deformation or wrinkles of the release paper, and significantly improve the coating uniformity and product qualification rate.

[0017] 2. In this utility model, the spring drives the upper feeding plate and the upper feeding roller to adapt to the thickness of the release paper through elastic force. The spring is fixed at the lower end of the upper feeding plate. It can prevent thin paper from being crushed and thick paper from being rigidly squeezed through elastic buffering, further improving the adaptability to release paper of different thicknesses. At the same time, the paper feeding roller drives the upper feeding roller to rotate synchronously through the belt. The upper feeding roller then drives the lower feeding roller to rotate in the opposite direction through the cross belt, forming an active conveying structure. While straightening wrinkles, it actively pushes the release paper, avoiding paper jams and slippage caused by passive conveying. It also reduces independent drive components, reducing equipment energy consumption and failure rate. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2This is a schematic diagram of the straightening module of this utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the coating module of this utility model. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the coating module of this utility model. Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the release paper path of this utility model;

[0023] Figure 6 This is a schematic diagram of the spring connection structure of this utility model.

[0024] Legend:

[0025] 1. Base plate; 2. Paper feed roller; 3. Paper feeding bracket; 4. First servo motor; 5. First tension sensor; 6. Magnetic powder brake; 7. Feeding bracket; 8. Lower feeding plate; 9. Upper feeding plate; 10. Adjusting plate; 11. Lower feeding roller; 12. Upper feeding roller; 13. Spring; 14. Coating bracket; 15. Second servo motor; 16. Second tension sensor; 17. Third servo motor; 18. Lead screw; 19. Slider; 20. Sliding plate; 21. Groove; 22. Coating roller; 23. Release paper; 24. Feed trough; 25. Paper take-up roller; 26. Drying equipment. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figure 1-5This utility model provides an embodiment of a release paper coating device, including a base plate 1, a paper feeding module, a coating module, and a paper receiving module. The paper feeding module includes two paper feeding supports 3 and a paper feeding roller 2. The two paper feeding supports 3 are fixed to the base plate 1. The rotating shaft of the paper feeding roller 2 is rotatably installed inside the two paper feeding supports 3, and one end of the roller is fixedly connected to the output shaft of a first servo motor 4. A first tension sensor 5 and a magnetic powder brake 6 are sleeved on the rotating shaft of the paper feeding roller 2. The coating module is located downstream of the paper feeding module and includes a coating support 14. The coating support 14 is fixed to the base plate 1, and a slider 19 and a sliding plate 2 are fixed on its upper part. The coating support 14 is slidably connected to the slider 19 via the groove 21 on it; a third servo motor 17 is fixed above the coating support 14, and its output shaft is fixedly connected to one end of the lead screw 18, while the other end of the lead screw 18 is engaged with the sliding plate 20; a coating roller 22 is rotatably mounted on the sliding plate 20, and one end of the rotating shaft of the coating roller 22 is fixedly connected to the output shaft of the second servo motor 15, and a second tension sensor 16 is sleeved on its rotating shaft; a material trough 24 is provided directly below the coating roller 22; the paper receiving module includes a paper receiving roller 25 and a drying device 26, with the drying device 26 located downstream of the coating roller 22 and the paper receiving roller 25 located downstream of the drying device 26.

[0028] It also includes a straightening and feeding module, which is located between the paper feeding module and the coating module. This module includes four feeding brackets 7, which are fixed to the base plate 1 in pairs. A sliding groove is provided on the opposite side of each feeding bracket 7. Between each pair of opposite feeding brackets 7, there is a lower feeding plate 8 and an upper feeding plate 9. The lower feeding plate 8 is fixed to the base plate 1, and the upper feeding plate 9 is slidably connected to the sliding groove. An adjusting plate 10 is fixedly connected to the upper ends of both upper feeding plates 9, and the adjusting plate 10 is slidably connected to the sliding groove. Springs 13 are fixedly connected to both ends of the bottom surface of any upper feeding plate 9, and the lower ends of the springs 13 are fixedly connected to the bottom end of the sliding groove. Two parallel lower feeding rollers 11 are rotatably installed between each group of lower feeding plates 8, and two adjacent upper feeding rollers 12 are rotatably installed between each group of upper feeding plates 9. The release paper 23 passes between the lower feeding rollers 11 and the upper feeding rollers 12. The rotating shafts of the two lower feeding plates 8 are connected by a belt, and the two upper feeding plates... The shaft of the upper feed plate 9 is connected by a belt. The shaft of the upper feed plate 9 on one side is connected to the shaft of the corresponding lower feed plate 8 by a cross belt. The shaft of the upper feed plate 9 on the other side is connected to the shaft of the paper feed roller 2 by a belt, so that the shaft of the paper feed roller 2 can simultaneously drive the two upper feed rollers 12 and the two lower feed rollers 11 to rotate in a preset direction. Both ends of the upper feed plate 9 and the adjusting plate 10 are provided with protrusions that are adapted to the sliding groove of the feed bracket 7. The protrusions slide in the sliding groove. One end of the release paper 23 is wrapped around the paper feed roller 2, passing under the coating roller 22, above the material trough 24 and inside the drying equipment 26 in sequence. The other end is wrapped around the take-up roller 25. A guide post is coaxially arranged inside the spring 13. The spring 13 is sleeved on the outside of the guide post. The feed bracket 7 and the upper feed plate 9 are provided with guide grooves at the positions corresponding to the guide post. The two ends of the guide post are fixed in the two guide grooves. The spring 13 is a compression spring, which makes the upper feed plate 9 have an upward tendency.

[0029] The material trough 24 is located on the base plate 1, and the height of the material trough 24 is adapted to the up and down sliding of the coating roller 22 to ensure that the coating roller 22 does not detach from the material trough 24 when sliding upward; the end of the lead screw 18 away from the third servo motor 17 is rotatably connected to the coating bracket 14 through the bearing seat, and the two ends of the rotating shaft of the coating roller 22 are rotatably connected to the sliding plate 20 through the bearing; the first tension sensor 5, the magnetic powder brake 6 and the second tension sensor 16 are all electrically connected to the external controller.

[0030] The specific implementation method is as follows: The workflow of the release paper coating equipment is divided into three stages: start-up preparation, operation coating, and shutdown finishing. Each stage works together to ensure stable coating and prevent the coating roller 22 from falling off the material trough 24.

[0031] During the preparation phase, material and equipment debugging must be completed: the original roll of release paper 23 is coaxially fixed on the paper feeding roller 2, and a retaining ring is used to limit and prevent axial displacement; release agent is injected into the material tank 24, and the liquid level is adapted to the dipping requirements of the coating roller 22 to ensure that the dipping conditions can still be met during subsequent adjustments; and the debugging ensures that each component can operate normally.

[0032] The coating process achieves full-process collaborative operation: the first servo motor 4 drives the upper feed roller 11 to rotate via a synchronous pulley and synchronous belt. The first servo motor 4 also drives the paper feed roller 2 to rotate counterclockwise to unfold the release paper 23. Simultaneously, the paper feed roller 2 drives the left upper feed roller 12 to rotate counterclockwise via a synchronous belt. The left upper feed roller 12 then drives the right upper feed roller 12 to rotate counterclockwise via a synchronous belt. The right upper feed roller 12 then drives the right lower feed roller 11 to rotate clockwise via a cross belt. The right lower feed roller 11 then drives the left lower feed roller 11 to rotate clockwise via a synchronous belt, thus coating the release paper 23. The forward movement of the 3 provides power; the first tension sensor 5 monitors the unwinding tension in real time, and the magnetic powder brake 6 dynamically adjusts the resistance to maintain the stable conveying of the release paper 23; after the release paper 23 enters the straightening module, the thick paper relies on its own rigidity to push up the upper feeding roller 12, which drives the upper feeding plate 9 to move up along the sliding groove of the feeding bracket 7 and compress the spring 13. The spring 13 provides buffer to prevent the thick paper from being crushed, while the thin paper is lightly pressed by the upper feeding roller 12 under the upward elastic force of the spring 13. The lower feeding roller 11 actively rotates in the opposite direction to the upper feeding roller 12 to eliminate the wrinkles of the original paper, and at the same time actively pushes the release paper 23 to pass smoothly. After entering the coating stage, the second servo motor 15 drives the coating roller 22 to rotate, dipping its bottom into the release agent in the material tank 24 and transferring it to the surface of the release paper 23. When the coating pressure needs to be adjusted according to the thickness of the release paper 23, the third servo motor 17 drives the lead screw 18 to move the sliding plate 20 (which cooperates with the slider 19 of the coating bracket 14 through the sliding groove 21) up and down, thereby adjusting the height of the coating roller 22. It should be noted that due to the preset liquid level and the small adjustment range, the coating roller 22 can always contact the release agent in the material tank 24, regardless of whether it is adjusted up or down, and will not fall out of the material tank 24, ensuring continuous and stable dipping. At the same time, the second tension sensor 16 monitors the coating tension. If fluctuations occur, it will finely adjust the paper feeding speed of the first servo motor 4 and the height of the coating roller 22 to ensure uniform coating. The coated release paper 23 first enters the drying equipment 26 to cure the coating, and then is synchronously wound up by the take-up roller 25 along with the movement of the release paper 23. The speed matching maintains the stability of the take-up paper tension and avoids irregular winding.

[0033] Before winding the release paper 23, the take-up roller 25 needs to be dried by the drying equipment 26. The drying process is existing technology and will not be described in detail here.

[0034] The final stage of shutdown focuses on equipment maintenance and parameter recording: First, the second servo motor 15 is turned off to stop coating. After the residual release agent on the surface of the coating roller 22 is exhausted, the first servo motor 4 is turned off to stop paper feeding and belt drive. Finally, the take-up roller 25 stops rotating after winding up the remaining release paper 23. Then, the inner wall of the feed trough 24 and the surface of the coating roller 22 are cleaned with a special solvent. Dust on the belt surface is removed and any loose belts are adjusted. The bearing condition of the lower feed roller 11 and upper feed roller 12 of the straightening module is checked, and deformed springs 13 are replaced. Finally, key parameters of this production are recorded, such as the thickness of the release paper 23, the adjustment status of the coating roller 22, the operating status of the belt drive, and the spring buffering effect, and stored in the process database to provide debugging references for subsequent production of similar products.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A release paper coating apparatus, comprising a base plate (1), characterized in that: It also includes a paper feeding module, a coating module, and a paper receiving module; The paper feeding module includes two paper feeding brackets (3) and a paper feeding roller (2). The two paper feeding brackets (3) are fixed to the base plate (1). The rotating shaft of the paper feeding roller (2) is rotatably installed in the two paper feeding brackets (3). One end of the roller is fixedly connected to the output shaft of the first servo motor (4). A first tension sensor (5) and a magnetic powder brake (6) are sleeved on the rotating shaft of the paper feeding roller (2). The coating module is located downstream of the paper feeding module and includes a coating bracket (14). The coating bracket (14) is fixed on the base plate (1), and a slider (19) is fixed on its upper part. The sliding plate (20) is slidably connected to the slider (19) through a groove (21) opened on it. A third servo motor (17) is fixed above the coating bracket (14). Its output shaft is fixedly connected to one end of the lead screw (18), and the other end of the lead screw (18) is engaged with the sliding plate (20). A coating roller (22) is rotatably mounted on the sliding plate (20). One end of the rotating shaft of the coating roller (22) is fixedly connected to the output shaft of the second servo motor (15), and a second tension sensor (16) is sleeved on its rotating shaft. A material trough (24) is provided directly below the coating roller (22). The paper receiving module includes a paper receiving roller (25) and a drying device (26), wherein the drying device (26) is located downstream of the coating roller (22) and the paper receiving roller (25) is located downstream of the drying device (26).

2. The release paper coating apparatus according to claim 1, characterized in that: It also includes a straightening and feeding module, which is located between the paper feeding module and the coating module. The module includes feeding brackets (7), four of which are fixed in pairs to the base plate (1). A sliding groove is provided on the opposite side of each feeding bracket (7). A lower feeding plate (8) and an upper feeding plate (9) are provided between each pair of opposite feeding brackets (7). The lower feeding plate (8) is fixed to the base plate (1), and the upper feeding plate (9) is slidably connected to the sliding groove. The two upper feeding plates (9) are... An adjustment plate (10) is fixedly connected to both ends of the upper feeding plate (9), and the adjustment plate (10) is slidably connected to the sliding groove. A spring (13) is fixedly connected to both ends of the bottom surface of any upper feeding plate (9), and the lower end of the spring (13) is fixedly connected to the bottom end of the sliding groove. Two parallel lower feeding rollers (11) are rotatably installed between each group of lower feeding plates (8), and two adjacent upper feeding rollers (12) are rotatably installed between each group of upper feeding plates (9). The release paper (23) passes through the lower feeding roller (11) and the upper feeding roller (12).

3. The release paper coating apparatus according to claim 2, characterized in that: The two lower feed plates (8) are connected by belts, and the two upper feed plates (9) are connected by belts. The upper feed plate (9) on one side is connected to the corresponding lower feed plate (8) by a cross belt, and the upper feed plate (9) on the other side is connected to the paper feed roller (2) by a belt, so that the paper feed roller (2) can simultaneously drive the two upper feed rollers (12) and the two lower feed rollers (11) to rotate in a preset direction.

4. The release paper coating apparatus according to claim 2, characterized in that: Both ends of the upper feeding plate (9) and the adjusting plate (10) are provided with protrusions that are adapted to the sliding groove of the feeding bracket (7), and the protrusions slide in cooperation with the sliding groove.

5. The release paper coating apparatus according to claim 2, characterized in that: One end of the release paper (23) is wrapped around the paper feed roller (2), passing in sequence below the coating roller (22), above the material trough (24), and inside the drying equipment (26), while the other end is wrapped around the paper take-up roller (25).

6. The release paper coating apparatus according to claim 2, characterized in that: A guide post is coaxially arranged inside the spring (13). The spring (13) is sleeved on the outside of the guide post. The feeding bracket (7) and the upper feeding plate (9) are provided with guide grooves at the positions corresponding to the guide post. The two ends of the guide post are fixed in the two guide grooves.

7. The release paper coating apparatus according to claim 6, characterized in that: The spring (13) is a compression spring, which causes the upper feed plate (9) to have an upward tendency.

8. The release paper coating apparatus according to claim 1, characterized in that: The material trough (24) is opened on the base plate (1), and the height of the material trough (24) is adapted to the up and down sliding of the coating roller (22) to ensure that the coating roller (22) does not detach from the material trough (24) when it slides upward.

9. The release paper coating apparatus according to claim 1, characterized in that: The end of the lead screw (18) away from the third servo motor (17) is rotatably connected to the coating bracket (14) through a bearing seat, and the two ends of the rotating shaft of the coating roller (22) are rotatably connected to the sliding plate (20) through bearings.

10. The release paper coating apparatus according to claim 1, characterized in that: The first tension sensor (5), the magnetic powder brake (6), and the second tension sensor (16) are all electrically connected to an external controller.

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