Leather dry production method and production line thereof

Abstract

The invention discloses a leather dry method production method and a production line thereof, compared with the traditional production and production process, the design of the invention is novel and unique, a leather finishing release paper transfer process is created, continuous production operation is realized, the mechanical, intelligent and batch production process requirements are met, the production efficiency is improved, and the production cost is reduced. The device is energy-saving, environment-friendly, high in production efficiency, high in automation degree, stable in structure, safe and reliable. The continuity and uniformity of the coating operation are ensured, the effect is good, the quality is stable, the coating operation of multiple types of leather such as soft and hard leather can be met by adjusting corresponding parameters of equipment, the production efficiency is greatly improved, the labor intensity is reduced, the leather yield and the quality grade are improved, and the enterprise benefit is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of leather roller coating equipment, and in particular relates to a leather dry production method and a production line thereof. Background Art

[0002] The leather finishing process involves applying a prepared chemical slurry to the leather surface via knife coating, spraying, or roller coating. After drying and cooling, the slurry forms a uniform film on the leather surface. Depending on the customer's needs, the surface is then smoothed or textured to achieve the desired performance, appearance, feel, and comfort of the finished leather.

[0003] The current leather finishing process is a discontinuous one. This, combined with traditional manufacturing techniques, significantly reduces efficiency, increases costs, creates inconsistent quality, and leads to rework and even scrap. The wastewater generated is energy-consuming, expensive to treat, environmentally unfriendly, and poses a risk to workers' physical and mental health.

[0004] The existing leather finishing process primarily involves: leather → base coating → drying → cooling → palletizing → transport → top coating → drying → cooling → palletizing → transport → humidifying the back of the leather in a spray gun → air drying → transport → embossing. This non-continuous process involves multiple transfers, resulting in low production efficiency, high production costs, and high labor intensity.

[0005] The spraying machine's uneven application of water mist to the leather back affects the final printing effect, so a natural drying process is required. This production process does not meet the requirements of continuous production balance, resulting in inconsistent quality across the process, frequent defective products and rework, environmental impact, waste of slurry, and high labor costs.

[0006] This necessitated the development of a dry-process leather production line and process that enables continuous production to address these current challenges. After extensive market research and dedicated research and testing, the inventors developed a dry-process leather production line and process that features a high degree of automation, environmental protection, energy conservation, high production efficiency, reduced processing costs, and superior, stable quality leather products. This improves the quality of finished leather products, increasing business profitability and market competitiveness. Summary of the Invention

[0007] Based on the problem that the existing leather finishing production process in the background technology is non-continuous production, the applicant proposed a leather dry production line and production method to achieve continuous production to solve the problems of the existing production method. Compared with traditional production and production processes, the design of the present invention is novel and unique. It has pioneered a leather finishing release paper transfer process, realized continuous production operations, and met the production process requirements of mechanization, intelligence and batch production. It is energy-saving, environmentally friendly, has high production efficiency, a high degree of automation, a stable structure, and is safe and reliable. It not only ensures the continuity and uniformity of the finishing operation, good effect and stable quality, but also can meet the finishing operations of multiple varieties of leather such as soft and hard leather by adjusting the corresponding parameters of the equipment, greatly improving production efficiency, reducing labor intensity, improving leather yield and quality grade, and improving corporate benefits.

[0008] In one aspect, the present invention provides a dry leather production method, which is as follows: Step 1: Place the release paper roll on the reel of the unwinding device, trim the joint of the release paper roll on the unwinding device and the joint of the release paper roll in the production line with high-temperature tape, and then splice them together. Then store the paper and adjust the tension of the release paper in the production line. Step 2: The release paper in step 1 passes through a roller coater to coat the surface of the release paper with slurry, and then the moisture in the slurry on the surface of the release paper is dried. After drying, it is cooled and transferred to the transition flattening process before entering the next process; Step 3: The leather to be coated on the transfer cart is placed at the corresponding position of the coating machine. After the leather surface is coated with a layer of glue by a roller, it is flattened by the leather splicer and sent to the drying area for cooling. The cooled glued leather is flattened on a bridge and then transferred to the next process. Step 4: Use the heating roller and rubber roller of the laminating machine to tightly bond the release paper surface layer in step 2 and the leather adhesive layer in step 3 together; Step 5: Use segmented temperature control to gradually dry out the moisture in the release paper that is bonded to the leather, ensuring that the surface layer and the adhesive layer are firmly bonded; Step 6: Cool the dried release paper laminated to the leather; Step 7: Peel off the finished leather from the release paper surface and place the obtained finished leather material on the finished leather transfer trolley (second leather transfer trolley); Step 8: Clean up the remaining release paper, and then rewind the tape and release paper separately.

[0009] On the other hand, the present invention proposes a production line for a dry leather production method, including a display controller 15. The production line includes a release paper working area, a leather working area and a laminating working area. The release paper working area is provided with a unwinding device, a paper receiving table, a storage rack, a tension device, a release paper roller coater, an oven, a release paper cooling device, and a transition wheel group from front to back. A platform is provided between the devices in the release paper working area. The leather working area is provided with a leather transfer cart, a leather roller coater, an oven, a cooling device, and a bridge from front to back; the laminating working area includes a laminating machine, and an oven, a cooling device, and a leather peeling device are provided behind the laminating machine. A leather transfer cart is installed on one side of the leather peeling device, and a cleaning device and a winding device are provided on the other side. The transition wheel group and the bridge are connected to the laminating machine.

[0010] Furthermore, the production line is arranged in an upper and lower platform style, with the release paper working area located on the upper platform and the leather working area and laminating working area located on the lower platform.

[0011] Furthermore, escalators are installed on both sides of the upper platform. The upper platform is arranged with the first platform, unwinding device, paper receiving platform, second platform, storage rack, tension device, third platform, release paper roller coater, fourth platform, oven, release paper cooling device and fifth platform from left to right. A transition wheel group is installed on the lower surface of the right side of the upper platform. The lower platform is arranged with the first leather transfer cart, leather roller coater, oven, cooling device, bridge, film unwinding device, laminating machine, oven, cooling device, winding device, sixth platform, cleaning device, leather peeling device and its second leather transfer cart from left to right. The transition wheel group is located above the laminating machine.

[0012] Furthermore, the unwinding device includes a correction mechanism, a magnetic powder brake and a release paper roll. The release paper roll is unwound with a certain tension under the action of the magnetic powder brake. At the same time, the correction mechanism swings left and right in real time to ensure that the release paper unwinding swings within the allowable range of the same reference axis, ensuring that the release paper is unwound neatly. The storage rack includes a lower glue roller, an upper glue roller, a cylinder and a release paper storage roller group, and the transition wheel group includes a guide wheel, a flattening roller and a guide wheel.

[0013] Furthermore, the oven includes a camera, a hot air system, a dehumidification system, a temperature probe and a pressure wheel, and the cooling device includes a cold air system and a pressure wheel.

[0014] Furthermore, the laminating machine includes a guide roller, a tension sensor, a force arm, a tension roller, a heating roller, and a rubber roller. The tension sensor is installed on the shaft head at one end of the guide roller, one end of the force arm is installed on the two end shafts of the guide roller, and the other end is installed with a tension roller. The guide roller is fastened to the two end shafts of the guide roller through a clamping sleeve. The guide roller can flatten the conveyed release paper, and the heating roller drives the release paper to descend to form a working gap between it and the rubber roller.

[0015] Furthermore, the winding device includes a correction mechanism, a magnetic powder brake, a release paper roll and a reduction motor. The reduction motor drives the release paper to be wound with a certain tension under the action of the magnetic powder brake. At the same time, the correction mechanism swings left and right in real time to ensure that the release paper is wound within the allowable range of the same reference axis, ensuring that the release paper is wound neatly.

[0016] Furthermore, the structure of the cleaning device is as follows: after the tape roll passes through the magnetic powder brake and sequentially covers the surface of the first guide roller of the cleaning device, the upper rubber roller of the cleaning device and the second guide roller of the cleaning device, the reduction motor finally drives the tape roll to be rewound, wherein the release paper with residual material sequentially covers the surface of the entrance guide roller, the lower rubber roller of the cleaning device and the exit guide roller and is then transmitted to the next process equipment.

[0017] Furthermore, the structure of the paper receiving platform is as follows: the release paper sequentially covers the surface of the first guide roller, the second guide roller and the third guide roller and enters the second platform, a Y-shaped connecting frame is provided between the second guide roller and the third guide roller, two rubber rollers are installed on the top of the Y-shaped connecting frame, and a cylinder is connected to the bottom of the Y-shaped connecting frame.

[0018] The following beneficial effects can be achieved through the above technical solution: 1. Compared with existing technologies, this invention achieves continuous process operation, seamlessly connecting all process links of the production line, reducing storage space and transportation time for materials and semi-finished products. The entire production line is intelligently operated, ensuring the quality of finished leather and safe and reliable operation, while improving production efficiency, energy conservation and environmental protection, saving labor, reducing costs, improving enterprise benefits, and enhancing market competitiveness.

[0019] 2. The paper splicing station in the production line of the present invention is simple and reliable to operate. In order to realize continuous operation of the production line, a special high-temperature adhesive tape can be used to quickly splice the release paper on the unwinding device and the release paper joint in the production line without affecting the continuous operation of the entire line and the effects of various processes.

[0020] 3. The tension device in the production line of this invention can maintain constant tension and instantly adjust the release paper tension, ensuring that the release paper along the entire line remains within a certain tension range and effectively preventing large tension fluctuations. This improves the drying and cooling quality of the release paper surface coating, as well as the tactile feel and physical properties of the finished leather. This results in high production efficiency, low production costs, and extended release paper life.

[0021] 4. The cleaning device in the production line of the present invention has a reasonable structural design, is intelligent, and is easy to operate. It can automatically clean up the residual material where the release paper is not in contact with the leather, thereby increasing the number of times the release paper can be used, reducing costs, and improving the economic benefits of the enterprise.

[0022] 5. The pressure rubber roller of the roller coater has excellent resilience and can compensate for 60-70% thickness deviation of leather, ensuring that the coating material is densely and evenly applied to the leather with a consistent thickness, minimizing product defect rates. Furthermore, the coating steel roller has a long service life and a stable coating volume.

[0023] 6. The leather joining machine and the conveyor belt of the bridge in the production line of the present invention are both designed with an opening angle of 6-8 degrees, which can tighten and flatten the painted leather, thereby improving the leather yield and leather quality grade, and increasing enterprise benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the principle block diagram of the leather dry production line.

[0025] Figure 2 It is a schematic diagram of an embodiment of a leather dry production line.

[0026] Figure 3 It is a schematic diagram of the paper receiving table structure.

[0027] Figure 4 It is a schematic diagram of the tension device structure.

[0028] Figure 5 It is a schematic diagram of the cleaning device structure.

[0029] Figure 6 It is a principle block diagram of a leather dry production method.

[0030] Figure 7 It is a partial enlarged view of the front part of an embodiment of a leather dry process production line.

[0031] Figure 8 It is a partial enlarged view of the rear part of the embodiment of the leather dry production line.

[0032] In the picture: In the figure: 1. First platform; 2. Unwinding device; 3. Paper receiving platform; 4. Second platform; 5. Storage rack; 6. Tension device; 7. Third platform; 8. Release paper roller coater; 9. Fourth platform; 10. Oven; 11. Cooling device; 12. Fifth platform; 13. Transition wheel set; 14. First leather transfer vehicle; 15. Display controller; 16. Leather roller coater; 17. Winding device; 18. Sixth platform; 19. Bridge; 20. Film unwinding and rewinding device; 21. Laminating machine; 22. Cleaning device; 23. , release paper roll, 24, peeling device; 021, correction mechanism, 022, magnetic powder brake, 023, release paper roll, 31, first guide roller, 32, anti-static system, 33, second guide roller, 34, rubber roller, 35, frame, 36, third guide roller, 37, table, 38, Y-type connecting frame, 39, cylinder, 50, lower rubber roller, 51, upper rubber roller, 52, storage rack cylinder, 53, release paper storage roller group, 60, tension device frame, 61, tension sensor A, 62, guide roller B, 64, guide Roller A, 65, rubber roller, 66, reduction motor, 67, tension arm, 68, tension roller, 80, coating roller, 81, chemical material, 82, release paper roller coating machine rubber roller, 100, camera, 101, hot air system, 102, dehumidification system, 103, temperature probe, 104, oven pressure roller, 110, cold air system, 111, cooling device pressure roller, 130, first guide roller, 131, flattening roller, 132, second guide roller, 161, leather feeding machine, 162, main machine, 163, leather joining machine, 210, Laminating machine guide roller, 211, tension sensor B, 212, laminating machine force arm, 213, laminating machine tension roller, 214, laminating machine heating roller, 215, laminating machine rubber roller, 200, unwinding part, 201, winding part, 221, entrance guide roller, 222, machine frame, 223, lower rubber roller of cleaning device, 224, exit guide roller, 225, upper rubber roller of cleaning device, 226, winding tape roll, 227, cleaning device camera, 228, second guide roller, 229, tape roll, 2210, first guide roller. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings: Figure 6 As shown, the present invention provides a dry leather production method, which is as follows: Step 1: Place the release paper roll on the reel of the unwinding device, trim the joint of the release paper roll on the unwinding device and the joint of the release paper roll in the production line with high-temperature tape, and then splice them together. Then store the paper and adjust the tension of the release paper in the production line. Step 2: The release paper in step 1 passes through a roller coater to coat the surface of the release paper with slurry, and then the moisture in the slurry on the surface of the release paper is dried. After drying, it is cooled and transferred to the transition flattening process before entering the next process; Step 3: The leather to be coated on the first leather transport vehicle is placed at the corresponding position of the coating machine. After the leather surface is coated with a layer of glue by a roller, it is flattened by the leather splicer and sent to the drying area for cooling. The leather is flattened by the bridge and then sent to the next process. Step 4: Use the heating roller and rubber roller of the laminating machine to tightly bond the release paper surface layer in step 2 and the leather adhesive layer in step 3 together; Step 5: Use segmented temperature control to gradually dry out the moisture in the release paper that is bonded to the leather, ensuring that the surface layer and the adhesive layer are firmly bonded; Step 6: Cool the dried release paper laminated to the leather; Step 7: Peel off the finished leather from the release paper and place the finished leather on the finished leather transfer trolley; Step 8: Clean up the remaining release paper, and then rewind the tape and release paper separately.

[0034] Based on the above method, the specific embodiment method is given as follows: The present invention provides a leather dry process production line and processing technology that realizes automated production and has the advantages of high production efficiency, energy saving, environmental protection, slurry saving, labor saving, good leather effect and stable quality, improved leather quality, and high leather yield. The process includes the following steps: Step 1: Release paper unwinding - first place the release paper roll selected according to the process requirements on the reel of the unwinding device.

[0035] At the same time, leather unloading can also be carried out - the leather to be coated on the first leather transfer vehicle is placed in the corresponding position of the coating process equipment.

[0036] Step 2: Attaching the Release Liner - To ensure continuous production on the production line, the release paper roll joint on the unwinding device is trimmed and spliced ​​with the release paper roll joint on the production line using special high-temperature tape. Roller-coating the leather - After the leather surface is coated with glue, it is flattened by the leather splicing machine and transferred to the next process equipment.

[0037] Step 3: Storing release paper - the paper storage volume is set according to the maximum production speed to ensure that the paper splicing operation can be completed and the paper can be automatically stored under continuous production conditions.

[0038] Step 4: Adjust the tension of the release paper - adjust the tension of the release paper in the production line in real time to ensure that the production line speed fluctuates within an acceptable range without affecting the quality of each process.

[0039] Step 5: Coat the release paper roller with slurry - when the release paper passes through the gap between the rubber roller and the coating steel roller, the rotating coating steel roller evenly transfers the slurry in the surface groove to the surface of the release paper. The coating amount can be adjusted as needed.

[0040] Step 6: Release paper drying - segmented temperature control gradually dries the moisture in the slurry on the release paper surface.

[0041] Leather drying - segmented temperature control gradually dries the moisture in the slurry on the leather surface.

[0042] Step 7: Cooling the release paper - Cooling the dried release paper to facilitate the next process operation.

[0043] Leather cooling - cooling the leather after drying to facilitate the next process operation.

[0044] Step 8: Release paper transition flattening - the release paper is flattened and then transferred to the next process equipment.

[0045] Leather bridge flattening - flattening the leather and transferring it to the next process equipment.

[0046] Step 9: Laminating the release paper to the leather - Use the heating roller and rubber roller of the laminating machine to tightly bond the release paper surface layer and the leather adhesive layer together, and then transfer them to the next process equipment.

[0047] Step 10: Drying the release paper and leather - Use segmented temperature control to gradually dry out the moisture in the release paper that is bonded to the leather to ensure that the surface layer and the adhesive layer are firmly bonded.

[0048] Step 11: Cooling of release paper and leather - Cooling of the dried release paper bonded to the leather to facilitate the next process operation.

[0049] Step 12: Peeling off the finished leather - peeling off the finished leather from the release paper surface and placing it on the finished leather transfer trolley (the second leather transfer trolley).

[0050] Step 13: Cleaning the Release Liner Residue - The tape roll is unwound. The upper and lower pressure rollers press the tape tightly against the release liner, which transfers any remaining material from the release liner to the tape. The tape roll is then rewound, along with the release liner. The release liner can be reused, and the tape roll, after the remaining material has been bonded, is discarded.

[0051] Based on the production method, the applicant has designed a production line suitable for the dry leather production method. The specific embodiment is as follows: like Figure 1 As shown, a production line for a dry leather production method includes a release paper work area, a leather work area, and a laminating work area. The entire production line is arranged in an upper and lower platform format, with the release paper work area located on the upper platform (the second platform) and the leather work area and laminating work area located on the lower platform (the horizontal ground). The release paper working area is provided with a first platform 1, a unwinding device 2, a paper receiving platform 3, a second platform 4, a storage rack 5, a tension device 6, a third platform 7, a release paper roller coater 8, a fourth platform 9, an oven 10, a cooling device 11, a fifth platform 12, and a transition wheel group 13 from left to right; the leather working area is provided with a first leather transfer vehicle 14, a leather roller coater 16, an oven, a cooling device, and a bridge 19 from left to right; the laminating working area includes a laminating machine, and an oven, a cooling device, and a leather peeling device 24 are provided behind the laminating machine in sequence. A second leather transfer vehicle 23, a cleaning device 22 and a winding device 17 are installed near the leather peeling device, and a sixth platform 18 is arranged between the winding device and the cleaning device, wherein the transition wheel group and the bridge are connected to the laminating machine 21, and a film winding and releasing device 20 is installed near the laminating machine.

[0052] Based on the above production line layout, this embodiment further provides a specific production line equipment position relationship. Figure 2 、 7 and 8: A production line for a dry leather production method, wherein escalators are installed at both ends of the second-layer platform, and the middle of the second-layer platform is arranged from left to right in sequence: a first platform 1, a reeling device 2, a paper receiving platform 3, a second platform 4, a storage rack 5, a tension device 6, a third platform 7, a release paper roller coater 8, a fourth platform 9, an oven 10, a cooling device 11 and a fifth platform 12, wherein a transition wheel group 13 is installed on the lower surface of the right end of the second-layer platform.

[0053] The horizontal ground is arranged from left to right as the first leather transfer vehicle 14, the leather roller coater 16, the oven, the cooling device, and the bridge 19. A laminating machine 21 is installed on the right side of the bridge 19. A transition wheel group 13 is provided on the top of the laminating machine. The unwinding part and the winding part of the film unwinding device 20 are installed near the laminating machine. The oven and the cooling device are arranged on the right side of the laminating machine. The winding device 17, the sixth platform 18, the cleaning device 22 and the leather peeling device 24 are installed on the right side of the cooling device. A second leather transfer vehicle 23 is also installed near the leather peeling device 24.

[0054] The first platform 1 is mainly used for operators to observe the working status of the release paper roll on the unwinding device and to hang the release paper roll on the reel of the unwinding device.

[0055] The unwinding device 2 is mainly used for unwinding the passive release paper roll, which mainly includes a correction mechanism 021, a magnetic powder brake 022, and a release paper roll 023; the unwinding device mainly places the release paper roll, and a magnetic powder clutch is installed at one end of the reel to keep the unwinding speed constant. A correction mechanism 21 is installed at the bottom to ensure that the unwound release paper swings within the acceptable range of the axis reference line in real time.

[0056] The paper splicing table 3 is mainly used by operators to splice release paper. Figure 3The schematic diagram of the paper receiving station structure shows a frame 35 with a platform 37 at its top. Inside the frame are first, second, and third guide rollers 31, 33, and 36, which feed into the second platform 4. A Y-shaped connecting frame 38 is located between the second and third guide rollers. Two rubber rollers 34 are mounted on top of the Y-shaped connecting frame, and a cylinder 39 is connected to the bottom of the Y-shaped connecting frame. Release paper 30 sequentially wraps around the first, second, and third guide rollers 31, 33, and 36 before being passed to the next process equipment (the second platform). The connecting frame is connected to the cylinder and the shaft ends of the two rubber rollers, respectively, allowing both rollers to be raised and lowered simultaneously. An anti-static system 32 is installed near the first guide roller 31 to eliminate static electricity on the release paper, preventing dust and improving product quality. The second platform 4 is equipped with guide wheels for transferring the release paper.

[0057] When splicing release paper, the front-end release paper roll is flattened and placed under the left rubber roller 34. The back-end release paper roll is flattened and placed under the right rubber roller 34. The cylinder rod retracts, pressing the front and back release paper joints tightly against the splicing worktable. The joints are then trimmed neatly with a cutter and securely bonded with special high-temperature tape. Finally, the cylinder rod extends, driving the two rubber rollers 34 upward. The release paper is then transported to the next process direction.

[0058] The accumulator is primarily used to store a certain number of meters of release paper, based on the production line's designed speed, to facilitate splicing of release paper joints without stopping the entire line. It primarily comprises a lower glue roller 50, an upper glue roller 51, an accumulator cylinder 52, and a release paper accumulator roller assembly 53. When splicing release paper, the accumulator cylinder 52 extends, driving the upper glue roller downward, squeezing the release paper between the lower and upper glue rollers. As the production line continues to operate, the accumulator roller assembly moves downward, releasing the stored release paper. When splicing is complete, the cylinder rod retracts, driving the upper glue roller upward. The accumulator roller assembly then moves upward, storing a further length of release paper.

[0059] The tension device is mainly used to control the release paper tension, so that the release paper of the entire line can fluctuate within a certain tension range, effectively avoiding large tension fluctuations that affect the service life of the release paper and the quality of the coating. Figure 4 As shown, the tension device includes a tension device frame 60. According to the direction of the release paper, a guide roller A64, a rubber roller 65, a guide roller B62, a tension arm 67, and a tension roller 68 are arranged in the frame in sequence. The reduction motor 66 is connected and fixed to the rubber roller shaft. The tension sensor is installed on the shaft head of the guide roller B62. One end of the tension arm is fastened to the two end shafts of the guide roller B62 through a tightening sleeve, and the other end is connected and fixed to the two end shafts of the tension roller.

[0060] The reduction motor drives the rubber roller to rotate and drives the release paper 30 to be transported in the process direction. When the tension of the release paper becomes larger, the tension roller will rise. At this time, the tension sensor A61 transmits data to the control system to increase the speed of the reduction motor, and vice versa.

[0061] The third station 7 is mainly used to facilitate the transfer of release paper between the release paper roller coater 8 and the process equipment before and after it.

[0062] The release paper roller coater is primarily used for coating release paper with slurry. It consists of a coating roller 80, a chemical hopper 81, and a rubber roller 82. The rubber roller 82 moves upward, pulling the release paper around the coating roller. Driven by a reduction motor, the coating roller evenly coats the chemical in the chemical hopper onto the release paper surface.

[0063] The fourth station 9 is mainly used for cleaning the coating roller of the release paper roller coater and observing the coating effect of the release paper.

[0064] The oven 10 is mainly used to dry the moisture in the release paper slurry. It mainly includes a camera 100, a hot air system 101, a dehumidification system 102, a temperature probe 103, and an oven pressure roller 104. The camera is used to monitor the operating status of the equipment. When a problem is found, an audible and visual alarm will be issued in the display controller 15, and the fault point will be locked to facilitate the operator to handle it in time. The hot air system can have a variety of heat source options and can set different temperatures. The temperature probe measures the temperature in the oven and feeds the data back to the hot air system in real time, and performs intelligent segmented independent temperature control to ensure uniform heating and drying. The dehumidification system will promptly remove the water vapor generated by drying to ensure the drying effect. The oven pressure roller 104 constrains the release paper in the oven so that it will not fluctuate up and down significantly under the action of hot air during transportation, ensuring smooth transportation.

[0065] The cooling device 11 is primarily used to cool the dried release paper. It comprises a cooling air system 110 and a cooling roller 111. The cooling air system can be set to different temperatures to meet the cooling needs of different processes. The roller prevents the release paper from floating up and down during transport, ensuring smooth transport.

[0066] The fifth station 12 is mainly used for the transition of release paper between the front and rear process equipment, specifically the transition between the cooling device and the transition wheel group.

[0067] The transition wheel assembly 13 is primarily used for transferring and flattening the release paper between the upstream and downstream process equipment. It consists of an inverted "concave"-shaped fixture fixed to the second-level platform. A flattening roller 131 is mounted in the center of this fixture, with first and second guide rollers 130 and 132 mounted on either side. The first and second guide rollers 130 and 132 are primarily used to guide the release paper during transition, while the flattening roller 131 flattens the released paper in preparation for the next lamination process.

[0068] The first leather transfer vehicle 14 is mainly used to stack leather to be painted and manually transfer it to the process work position.

[0069] The leather roller coater 16 is primarily used to apply glue to the leather surface. It comprises a leather feeder 161, a main unit 162, and a leather splicer 163. The leather feeder ensures a smooth, wrinkle-free, and free-from surface, ensuring smooth transfer of the leather to the main unit 162. The main unit applies a layer of glue to the leather surface and then, under the action of the peeling roller, smoothly transfers the coated leather to the leather splicer. The splicer's conveyor belt features an 8° angle, further tightening and flattening the leather, improving the yield, before transferring it to the next process equipment (the drying oven).

[0070] The drying oven is primarily used to dry moisture from the leather adhesive layer. Its main structure is essentially the same as the above-mentioned drying oven, but it also includes a camera and a Teflon conveyor belt. The camera monitors the state of the leather after coating by the leather roller coater 16 in real time, and displays this information on the human-machine interface of the display controller. The Teflon conveyor is used to transport the coated leather. The Teflon conveyor mesh does not adhere to the slurry, ensuring that the leather is not contaminated. The cooling device is primarily used to cool the moisture from the dried leather adhesive layer.

[0071] The bridge 19 is mainly used for leather transition and flattening to improve the leather yield.

[0072] The laminating machine 21 is mainly used for laminating the leather adhesive layer and the release paper upper slurry layer tightly together. It mainly includes a laminating machine guide roller 210, a tension sensor B211, a laminating machine force arm 212, a laminating machine tension roller 213, a laminating machine heating roller 214, and a laminating machine rubber roller 215; the tension sensor B211 is installed on the shaft head at one end of the laminating machine guide roller 210, one end of the laminating machine force arm 212 is installed on the two end shafts of the laminating machine guide roller 210, and the other end is installed with the laminating machine tension roller 213, wherein the guide roller is fastened to the two end shafts of the guide roller through a clamping sleeve, and the guide roller has a flattening function, and can flatten the conveyed release paper according to the process direction. The guide roller, tension sensor, force arm and tension roller work together to control the tension of the release paper and flatten the release paper, so as to ensure that the surface tension of the release paper is uniform and improve the laminating effect; after the temperature of the heating roller is raised to the temperature required by the process, it drives the release paper to descend and forms a working gap between it and the rubber roller, so as to facilitate the conveyed leather glue surface and the surface layer of the release paper to be tightly adhered together, and then conveyed to the next process equipment.

[0073] The film rewinding device 20 includes a rewinding part 200 and a rewinding part 201. The rewinding part is equipped with a reduction motor, and the film paper is retracted and released through the above structure. This structure is to prevent the chemical material on the release paper from sticking to the rubber roller of the laminating machine during laminating, affecting the laminating effect and affecting the service life of the release paper.

[0074] After the leather adhesive surface and the surface layer of the release paper are tightly adhered, they are sent to the drying oven and cooling device. The structure of the drying oven and cooling device is the same as that of the above-mentioned drying oven and cooling device, and they will not be described in detail here.

[0075] After the leather adhesive surface and the surface layer of the release paper are tightly attached and come out of the cooling device, they pass under the winding device 17, transition to the sixth platform, pass under the cleaning device 22, and finally enter the peeling device 24. The peeling device 24 is mainly used to facilitate the smooth peeling of the finished leather from the release paper at the optimal angle, and then pass through the second leather transfer vehicle 23 to stack the finished leather, and finally manually transport it to the corresponding area.

[0076] The release paper enters the cleaning device 22, which is mainly used to clean the residual material on the surface of the release paper with a special tape. Figure 5 As shown, the cleaning device includes a frame 222, and the upper part of the frame 222 is installed with a magnetic powder brake, a first guide roller 2210 of the cleaning device, an upper rubber roller 225 of the cleaning device, a second guide roller 228 of the cleaning device and a winding roll 226 according to the tape transmission path, wherein the winding roll 226 is driven by a reduction motor, and a lower rubber roller 223 of the cleaning device is installed below the upper rubber roller 225 of the cleaning device, an inlet guide roller 221 is installed on the right side of the lower rubber roller 223 of the cleaning device, and an outlet guide roller 224 is installed on the left side. The lower rubber roller 223 of the cleaning device is also driven by a reduction motor.

[0077] The unwinding tape roll 229 passes through a magnetic powder brake and sequentially wraps around the surfaces of the cleaning unit's first guide roller 2210, the cleaning unit's upper rubber roller 225, and the cleaning unit's second guide roller 228. Finally, a reduction motor drives the rewinding tape roll. The release paper with residual material then wraps around the entrance guide roller 221, the cleaning unit's lower rubber roller 223, and the exit guide roller 224 before being transported to the next process equipment. The magnetic powder brake limits the unwinding of the unwinding tape roll to a certain tension, ensuring a smooth, wrinkle-free tape and excellent bonding results. The reduction motor is connected to one end of the lower rubber roller 223, driving the roller and conveying the release paper in the process direction. A cleaning unit camera 227 monitors the removal of residual material from the release paper surface in real time, transmitting this data to a display controller.

[0078] The tape is conveyed flat and wrinkle-free thanks to the combined action of the tape roll, magnetic powder brake, and reduction motor. The reduction motor drives the rubber roller to rotate and convey the release paper in the process direction.

[0079] When the adhesive tape and release paper pass through the gap between the lower rubber roller 223 and the upper rubber roller 225 of the cleaning device, the residual material on the release paper surface is transferred to the adhesive tape under the action of a certain pressure. Finally, the adhesive tape is reeled up and the cleaned release paper is transferred to the next process equipment.

[0080] After passing through the sixth station, the cleaned release liner enters the rewinding device, which rewinds the cleaned release liner for later use. The rewinding device primarily comprises a web-correcting mechanism, a magnetic powder brake, a release paper roll, and a reduction motor. The reduction motor drives the release paper roll, which is then rewound at a constant tension under the action of the magnetic powder brake. Simultaneously, the web-correcting mechanism oscillates left and right in real time, ensuring that the release paper roll remains within the allowable range of the same reference axis, ensuring neat rewinding.

[0081] Based on the above production line and production method, the specific method of using the production line is given: First: the operator places the rolled release paper roll on the reel of the unwinding device at the first station. The release paper passes through the paper receiving station in turn, transitions to the second station, where the storage rack stores the release paper and the tension device controls the tension of the release paper. After transitioning to the third station, the release paper roller coater rolls the surface of the release paper with slurry. After transitioning to the fourth station, the oven dries the slurry on the surface of the release paper. The cooling device cools the release paper. After transitioning to the fifth station, it is flattened by the transition wheel group and then goes to the laminating machine.

[0082] At the same time, the leather to be coated on the first leather transfer vehicle is sequentially transferred to the main machine via the leather roller coater's leather feeder. Glue is applied to the leather surface and then flattened by the leather splicer. The leather is then transferred to the drying oven to dry out the moisture in the slurry on the leather surface. The leather is then transferred to the cooling device for cooling. Finally, it is stretched and flattened by the bridge before being transferred to the laminating machine.

[0083] Then, the film paper of the film retracting and unreeling device is ready to be put in place to prevent the chemical material on the release paper from sticking to the rubber roller of the laminating machine during lamination, which will affect the laminating effect and the service life of the release paper.

[0084] Finally, the laminating machine's heated pressure rollers interact with the rubber rollers to firmly bond the leather's rubberized surface to the release paper's paste-coated surface. The leather then enters an oven for drying, followed by a cooling unit, before being transferred to a peeling unit where it is manually peeled and placed on a leather transport cart. The release paper then passes to a cleaning unit, where it removes any remaining material from the surface. Finally, the rewinder rewinds the paper for later use.

[0085] During this period, the front-end and back-end operators observe the production line operation status in the human-machine interaction interface of display controller A and display controller B in real time, and monitor the leather finishing effect and the operation status of each equipment in real time while ensuring personnel safety.

[0086] Compared to traditional production processes, the design of this invention is novel and unique. It pioneers a process for transferring release paper for leather finishing, enabling continuous production operations and meeting the requirements of mechanized, intelligent, and mass-produced production processes. It is energy-saving, environmentally friendly, highly efficient, highly automated, structurally stable, and safe and reliable. It ensures the continuity and uniformity of the finishing process, ensuring good results and stable quality. Furthermore, by adjusting the corresponding equipment parameters, it can be used to finish a variety of leather varieties, including soft and hard leather. This significantly improves production efficiency, reduces labor intensity, increases leather yield and quality grade, and enhances enterprise profitability.

[0087] Furthermore, the cleaning device of the present invention can remove residual materials from the release paper, allowing the release paper to be reused more than 10 times, thereby resolving the high production cost of release paper that can only be used once. Manual cleaning of residual materials from release paper is time-consuming and labor-intensive, and cannot be thorough enough to affect the surface quality of the finished leather. It may also damage the texture layer, smoothness, and flatness of the release paper surface, thereby affecting the surface finishing process of the finished product.

[0088] The above are all preferred embodiments of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, various equivalent modifications to the present invention are within the scope of protection of the claims attached to this application.

Claims

1. A dry leather production method, characterized in that: The method is as follows: Step 1: Place the release paper roll on the reel of the unwinding device, trim the joint of the release paper roll on the unwinding device and the joint of the release paper roll in the production line with high-temperature tape, and then splice them together. Then store the paper and adjust the tension of the release paper in the production line. Step 2: The release paper in step 1 passes through a roller coater to coat the surface of the release paper with slurry, and then the moisture in the slurry on the surface of the release paper is dried. After drying, it is cooled and transferred to the transition flattening process before entering the next process; Step 3: The leather to be coated on the transfer cart is placed in the corresponding position of the coating machine. After the leather surface is coated with a layer of glue by a roller, it is flattened by the leather splicer and sent to the drying area for cooling. The leather is flattened by the bridge and then transferred to the next process. Step 4: Use the heating roller and rubber roller of the laminating machine to tightly bond the release paper surface layer in step 2 and the leather adhesive layer in step 3 together; Step 5: Use segmented temperature control to gradually dry out the moisture in the release paper that is bonded to the leather, ensuring that the surface layer and the adhesive layer are firmly bonded; Step 6: Cool the dried release paper laminated to the leather; Step 7: Peel off the finished leather from the release paper and place the finished leather on the finished leather transfer trolley; Step 8: Use tape to clean the remaining material on the surface of the release paper, and then rewind the tape and release paper separately.

2. A production line based on the dry leather production method of claim 1, comprising a display controller, characterized in that: The production line includes a release paper working area, a leather working area and a laminating working area. The release paper working area is provided with a unwinding device, a paper receiving table, a storage rack, a tension device, a release paper roller coater, an oven, a release paper cooling device, and a transition wheel group from front to back. A platform is provided between the devices in the release paper working area. The leather working area is provided with a leather transfer vehicle, a leather roller coater, an oven, a cooling device, and a bridge from front to back; the laminating working area includes a laminating machine, and an oven, a cooling device, and a leather peeling device are provided behind the laminating machine. A leather transfer vehicle is installed on one side of the leather peeling device, and a cleaning device and a winding device are provided on the other side. The transition wheel group and the bridge are connected to the laminating machine.

3. A leather dry process production line according to claim 2, characterized in that: The production line is arranged in an upper and lower platform style, with the release paper work area located on the upper platform and the leather work area and laminating work area located on the lower platform.

4. The leather dry process production line according to claim 3, characterized in that: Escalators are installed on both sides of the upper platform. The upper platform is arranged with the first platform, unwinding device, paper receiving platform, second platform, storage rack, tension device, third platform, release paper roller coater, fourth platform, oven, release paper cooling device and fifth platform from left to right. A transition wheel group is installed on the lower surface of the right side of the upper platform. The lower platform is arranged with the first leather transfer cart, leather roller coater, oven, cooling device, bridge, film unwinding device, laminating machine, oven, cooling device, winding device, sixth platform, cleaning device, leather peeling device and its second leather transfer cart from left to right. The transition wheel group is located above the laminating machine.

5. The leather dry process production line according to claim 2, characterized in that: The unwinding device includes a correction mechanism, a magnetic powder brake and a release paper roll. The release paper roll is unwound with a certain tension under the action of the magnetic powder brake. At the same time, the correction mechanism swings left and right in real time to ensure that the release paper unwinding swings within the allowable range of the same reference axis, ensuring that the release paper is unwound neatly. The storage rack includes a lower glue roller, an upper glue roller, a cylinder and a release paper storage roller group. The transition wheel group includes a guide wheel, a flattening roller and a guide wheel.

6. The leather dry process production line according to claim 2, characterized in that: The oven includes a camera, a hot air system, a dehumidification system, a temperature probe and a pressure wheel, and the cooling device includes a cold air system and a pressure wheel.

7. The leather dry process production line according to claim 2, characterized in that: The laminating machine includes a guide roller, a tension sensor, a force arm, a tension roller, a heating roller, and a rubber roller. The tension sensor is installed on the shaft head at one end of the guide roller, one end of the force arm is installed on the shafts at both ends of the guide roller, and the other end is installed with a tension roller. The guide roller is fastened to the shafts at both ends of the guide roller through a clamping sleeve. The guide roller can flatten the conveyed release paper, and the heating roller drives the release paper down to form a working gap between it and the rubber roller.

8. The leather dry process production line according to claim 2, characterized in that: The winding device includes a correction mechanism, a magnetic powder brake, a release paper roll and a reduction motor. The reduction motor drives the release paper to be rewound at a certain tension under the action of the magnetic powder brake. At the same time, the correction mechanism swings left and right in real time to ensure that the release paper roll swings within the allowable range of the same reference axis, ensuring that the release paper is rolled neatly.

9. The leather dry process production line according to claim 2, characterized in that: The structure of the cleaning device is as follows: the tape roll passes through the magnetic powder brake and sequentially covers the surface of the first guide roller, the upper rubber roller and the second guide roller of the cleaning device. Finally, the reduction motor drives the tape roll to be rewound. Among them, the release paper with residual material sequentially covers the surface of the entrance guide roller, the lower rubber roller and the exit guide roller of the cleaning device and is then transmitted to the next process equipment.

10. The leather dry process production line according to claim 2, characterized in that: The structure of the paper receiving platform is as follows: the release paper sequentially covers the surface of the first guide roller, the second guide roller and the third guide roller and enters the second platform. A Y-shaped connecting frame is provided between the second guide roller and the third guide roller. Two rubber rollers are installed on the top of the Y-shaped connecting frame, and a cylinder is connected to the bottom of the Y-shaped connecting frame.

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