Slitting process of large slitting equipment for improving rolling transverse indentation
By optimizing the pressure roller design and pressure control, the indentation problem during the winding process of the large slitting machine is solved, the yield rate and product quality of the diaphragm are improved, and the pressure uniformity and winding neatness are ensured.
Patent Information
- Application Number
- CN202411268230.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2024-12-27
AI Technical Summary
Existing large slitting machines are prone to indentation during winding, resulting in poor appearance of the diaphragm, affecting product quality and safety, and making it difficult to accurately control pressure, resulting in low yield.
By optimizing the diameter and glue hardness of the press roller, the contact area between the press roller and the film coil is increased, combined with appropriate pressure settings and advance pressure relief technology, the pressure is ensured to be evenly distributed, the generation of transverse indentation is reduced, and the winding is adjusted by adjusting the winding. The core size and pressure of the roller are controlled to improve the neatness of the roll.
It effectively reduces the generation of transverse indentation, improves the yield rate of the film, reduces the complexity of manual operation, realizes the accuracy of pressure control, and ensures high quality and safety of the product.
Smart Images
Figure CN119190941A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of diaphragm slitting technology, and more specifically, it relates to a slitting process of a large slitting device with improved transverse indentation of winding. Background Art
[0002] The large slitting machine is a device used to slit and rewind the base film produced by the main line. The process design of the large slitting directly affects the final winding effect of the diaphragm, and poor appearance will affect the performance and safety of the battery.
[0003] During the winding process of the slitting process, the function of the pressure roller is to press the diaphragm to ensure the tightness and neatness of the diaphragm. However, if the pressure of the pressure roller is too large or uneven, it may cause indentations on the diaphragm, affecting product quality. In addition, pressure control technology also plays an important role in the winding process. Appropriate pressure settings can improve the quality and efficiency of winding. At present, the finished products cut by the large slitting process have poor appearance of transverse indentations during winding, which not only seriously affects the final yield rate of diaphragm production, but is also more likely to cause problems for customers after the product is delivered to customers. Therefore, a new process method is needed to cooperate with the slitting equipment to ensure a higher final product yield rate. Summary of the invention
[0004] In order to improve the yield rate of slitting finished products, the present application provides a slitting process of a large slitting device that improves the transverse indentation of winding, and adopts the following technical solution:
[0005] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0006] S1, Unwinding: The mother roll diaphragm is unwound through the unwinding shaft, and the diaphragm enters the slitting equipment;
[0007] S2, flattening: the diaphragm entering the slitting equipment is pulled by several rollers and then enters the curved roller for flattening;
[0008] S3, slitting: the flattened diaphragm is slitting by a cutting roller to form several slitting rolls;
[0009] S4, winding: a part of the slit roll is wound up to the first winding roll by pulling the plurality of rollers and the first pressure roller, and the rest of the slit roll is wound up to the second winding roll by pulling the plurality of rollers and the second pressure roller, so as to complete the slitting and winding of the diaphragm and obtain the finished film;
[0010] The diameters of the first pressing roller and the second pressing roller are 120 mm to 150 mm respectively, the hardness of the rubber coating of the first pressing roller and the second pressing roller is 50° to 80° respectively, and the rubber coating of the first pressing roller and the second pressing roller is made of polyurethane rubber.
[0011] By adopting the above technical solution, the diameter of the pressure roller and the hardness of the rubber coating are optimized, the contact area between the first pressure roller, the second pressure roller and the winding film roll can be increased, the squeezing of the film roll by the first pressure roller and the second pressure roller can be reduced, and the generation of lateral indentations on the film roll can be further reduced.
[0012] Optionally, the slitting and winding speed in steps S3 and S4 is 100-120 m / min.
[0013] By adopting the above technical solution, the speed of slitting and winding is optimized, so that the speed in the entire slitting equipment is matched, and the uniformity of winding is guaranteed.
[0014] Optionally, the winding pressures of the first pressing roller and the second pressing roller are 100 N / m-500 N / m respectively.
[0015] By adopting the above technical solution, the air between the diaphragms can be discharged smoothly under appropriate pressure, and the film can be rolled up smoothly without causing wrinkles due to too low pressure.
[0016] Optionally, the distance between the first side of the first pressure roller and the side edge of the diaphragm close to the first side of the first pressure roller is L1, the distance between the second side of the first pressure roller and the side edge of the diaphragm close to the second side of the first pressure roller is L2, L1-L2≤100mm; the pressure on one side of the first pressure roller is F1, the pressure on the other side of the first pressure roller is F2, (F1-F2) / F1≤10%; the pressure on one side of the second pressure roller is F3, the pressure on the other side of the second pressure roller is F4, (F3-F4) / F3≤10%.
[0017] By adopting the above technical solution, the diaphragm is centered relative to the pressure roller and the pressure on both sides of the pressure roller is controlled, so that the pressure roller can apply pressure to the diaphragm evenly, which can effectively reduce the problem of transverse indentation during winding caused by excessive or uneven pressure.
[0018] Optionally, the first pressing roller and the second pressing roller release pressure in advance before winding is completed.
[0019] Optionally, the number of meters for which the first pressing roller and the second pressing roller perform early pressure relief before the end of winding is M, and 5m≤M≤10m.
[0020] Optionally, the first pressing roller and the second pressing roller are depressurized in advance before winding is completed, the pressure after depressurization is F, the pressure before depressurization is F0, and 10%≤F / F0≤30%.
[0021] Optionally, the winding cores of the first winding roller and the second winding roller are 8-inch or 10-inch EVA winding cores.
[0022] By adopting the above technical solution, the core sizes of the first winding roller and the second winding roller are optimized. The relatively large winding diameter can increase the contact area between the winding roller and the diaphragm, and reduce the squeezing of the diaphragm by the pressure roller during shutdown.
[0023] Optionally, the average defective rate of transverse indentation of the finished film is controlled at ≤5%.
[0024] In summary, this application has the following beneficial effects:
[0025] 1. This technical solution sets the pressure relief of the winding roller in advance in the slitting machine program, thereby automatically reducing the roller pressure before the winding length is completed, greatly improving the degree of automation and reducing the complexity and difficulty of manual operation.
[0026] 2. This technical solution sets a specific pressure reduction ratio to make the pressure reduction more precise, thus avoiding the problem of lateral indentation of the cut diaphragm caused by inaccurate pressure control.
[0027] 3. This technical solution optimizes the specifications of the pressure roller, increases the contact area between the pressure roller and the winding film roll, reduces the squeezing of the film roll by the pressure roller, effectively avoids the generation of indentations, and effectively improves the yield rate of the film. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the structure of the slitting equipment in this application;
[0029] Figure 2 It is a schematic diagram of the use of the winding roller provided in this application;
[0030] Figure 3 It is a schematic diagram of the pressure change of the receiving roller in this application;
[0031] Figure 4 It is a schematic diagram of the transverse indentation during winding.
[0032] Explanation of the accompanying reference numerals: 1. unwinding shaft; 2. passing roller; 3. arc roller; 4. cutting knife roller; 5. first pressing roller; 6. first winding roller; 7. second pressing roller; 8. second winding roller; 9. winding core; 10. transverse indentation; 11. film roll. DETAILED DESCRIPTION
[0033] The present application is further described in detail below with reference to the embodiments.
[0034] Example
[0035] Example 1
[0036] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0037] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0038] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0039] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0040] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0041] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0042] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0043] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 10% of the original pressure 5 m before the end of winding.
[0044] Example 2
[0045] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0046] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0047] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0048] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0049] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0050] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0051] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0052] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 20% of the original pressure 5 m before the end of winding.
[0053] Example 3
[0054] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0055] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0056] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0057] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0058] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0059] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0060] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0061] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 30% of the original pressure 5 m before the end of winding.
[0062] Example 4
[0063] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0064] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0065] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0066] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0067] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0068] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0069] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0070] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 20% of the original pressure 7.5 m before the end of winding.
[0071] Example 5
[0072] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0073] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0074] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0075] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0076] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0077] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0078] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0079] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 10% of the original pressure 10 m before the end of winding.
[0080] Example 6
[0081] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0082] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0083] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0084] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0085] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0086] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0087] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0088] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 20% of the original pressure 10 m before the end of winding.
[0089] Example 7
[0090] The present application provides a slitting process for a large slitting device for improving the transverse indentation of winding, comprising the following steps:
[0091] S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft 1, and the diaphragm enters the slitting equipment. The unwinding shaft 1 is controlled by the unwinding system;
[0092] S2, flattening: the diaphragm entering the slitting device is pulled by a plurality of rollers 2 and then enters the arc roller 3 for flattening; specifically, the number of the rollers 2 is 3.
[0093] S3, slitting: the flattened diaphragm is slitting through a cutter roller 4 to form a plurality of slitting rolls. Specifically, the flattened diaphragm is slitting through a cutter roller 4 to form a first slitting roll and a second slitting roll. The slitting speed is 100 m / min.
[0094] S4, winding: a part of the slit roll is wound up to the first winding roll 6 by pulling by a plurality of rollers 2 and the first pressure roller 5, and the rest of the slit roll is wound up to the second winding roll 8 by pulling by a plurality of rollers 2 and the second pressure roller 7, so as to complete the slitting and winding of the diaphragm and obtain the finished film. Specifically, the number of rollers 2 is 2, and the first winding roll 6, the second winding roll 8, the first pressure roller 5 and the second pressure roller 7 are controlled by the winding system.
[0095] Among them, Figure 2 As shown, the distance between the left side of the first pressure roller 5 and the left side edge of the diaphragm is L1, the distance between the right side of the first pressure roller 5 and the right side edge of the diaphragm is L2, L1-L2=100mm; the pressure on the left side of the first pressure roller 5 is F1, the pressure on the right side of the first pressure roller 5 is F2, (F1-F2) / F1=10%.
[0096] The distance between the left side of the second pressing roller 7 and the left side edge of the diaphragm is L3, the distance between the right side of the second pressing roller 7 and the right side edge of the diaphragm is L4, L3=L1, L4=L2, L3-L4=100mm; the pressure on the left side of the second pressing roller 7 is F3, the pressure on the right side of the second pressing roller 7 is F4, F3=F1, F4=F2, (F3-F4) / F3=10%.
[0097] The diameters of the first pressing roller 5 and the second pressing roller 7 are both 120 mm, the rubber coating hardness of the first pressing roller 5 and the second pressing roller 7 is both 60°, the rubber coating of the first pressing roller 5 and the second pressing roller 7 is made of polyurethane rubber, and the cores 9 of the first winding roller 6 and the second winding roller 8 are both 10-inch EVA cores; the winding system is set as follows: the winding pressure is 100 N / m, and the winding pressure for early pressure relief is that the pressure is reduced to 30% of the original pressure 10 m before the end of winding.
[0098] Table 1
[0099]
[0100] In Examples 1-7, a total of 14 large mother rolls were slit, and each example was slit into 2 large mother rolls. Each large mother roll was cut and rolled into 5 small rolls, and a total of 70 finished rolls were rolled, of which 1 roll had defective transverse indentation, and the average defective rate of transverse indentation was 1 / 70=1.43%. The diaphragm prepared by the slitting process of the present application had a lower defective rate.
[0101] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
Claims
1. A slitting process for large slitting equipment with improved transverse indentation of winding, characterized in that: The following steps are involved: S1, unwinding: the mother roll diaphragm is unwound through the unwinding shaft (1), and the diaphragm enters the slitting device; S2, flattening: the diaphragm entering the slitting device is pulled by a number of rollers (2) and then enters the curved roller (3) for flattening; S3, slitting: the flattened diaphragm is slitting by a cutting roller (4) to form a plurality of slitting rolls; S4, winding: a portion of the slit roll is pulled and wound onto the first winding roll (6) by a plurality of rollers (2) and a first pressure roller (5), and the remaining slit roll is pulled and wound onto the second winding roll (8) by a plurality of rollers (2) and a second pressure roller (7), thereby completing the slitting and winding of the diaphragm to obtain a finished film; The diameters of the first pressing roller (5) and the second pressing roller (7) are 120 mm to 150 mm respectively, the hardness of the rubber coating of the first pressing roller (5) and the second pressing roller (7) is 50° to 80° respectively, and the rubber coating of the first pressing roller (5) and the second pressing roller (7) is made of polyurethane rubber.
2. The slitting process of a large slitting device for improving the transverse indentation of winding according to claim 1, characterized in that: The slitting and winding speed in steps S3 and S4 is 100-120 m / min.
3. The slitting process of the large slitting equipment for improving the transverse indentation of the winding according to claim 1, characterized in that: The winding pressure of the first pressing roller (5) and the second pressing roller (7) are respectively 100 N / m-500 N / m.
4. The slitting process of a large slitting device for improving the transverse indentation of winding according to claim 1, characterized in that: The distance between the first side of the first pressing roller (5) and the side edge of the diaphragm close to the first side of the first pressing roller (5) is L1, and the distance between the second side of the first pressing roller (5) and the side edge of the diaphragm close to the second side of the first pressing roller (5) is L2, L1-L2≤100mm; the pressure on one side of the first pressing roller (5) is F1, and the pressure on the other side of the first pressing roller (5) is F2, (F1-F2) / F1≤10%; the pressure on one side of the second pressing roller (7) is F3, and the pressure on the other side of the second pressing roller (7) is F4, (F3-F4) / F3≤10%.
5. The slitting process of the large slitting equipment for improving the transverse indentation of the winding according to claim 1, characterized in that: The first pressing roller (5) and the second pressing roller (7) relieve pressure in advance before winding is completed.
6. The slitting process of the large slitting equipment for improving the transverse indentation of the winding according to claim 5, characterized in that: The number of meters for which the first pressing roller (5) and the second pressing roller (7) perform early pressure relief before the end of winding is M, and 5m≤M≤10m.
7. The slitting process of the large slitting equipment for improving the transverse indentation of the winding according to claim 5, characterized in that: The first pressing roller (5) and the second pressing roller (7) are depressurized in advance before the winding is completed, the pressure after depressurization is F, the pressure before depressurization is F0, and 10%≤F / F0≤30%.
8. The slitting process of a large slitting device for improving the transverse indentation of winding according to claim 1, characterized in that: The winding core (9) of the first winding roller (6) and the second winding roller (8) is an 8-inch or 10-inch EVA winding core.
9. The slitting process of a large slitting device for improving the transverse indentation of winding according to claim 1, characterized in that: The average defective rate of transverse indentation of the finished film is controlled at ≤5%.