Large slitting process design method for improving sagging and dead wrinkling of rolled edge

Abstract

The invention relates to the technical field of battery diaphragms, and particularly discloses a large slitting process design method for improving sagging and dead wrinkling of a rolled edge. The invention discloses a large slitting process design method for improving rolling edge sagging and dead wrinkling. The large slitting process design method comprises the following steps that S1, unwinding is conducted, specifically, a to-be-slit product is unwound through an unwinding roller; s2, flattening is conducted, specifically, the to-be-slit product unwound by the unwinding roller is flattened and conveyed through a flattening roller; s3, slitting: conveying the flattened product to be slit into slitting equipment, and slitting to obtain small rolls; and S4, rolling is conducted, specifically, the rolling pressure F of a rolling roller is controlled to be 100-500 N / m, the small rolls slit by the slitting equipment are rolled, and finished small rolls are obtained. The large slitting process design method has the advantage that the phenomena of sagging and dead wrinkling of the edge of the base film are stably reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery separators, and more specifically, to a large slitting process design method for improving the collapse and dead wrinkles of winding edges. Background Art

[0002] The large slitting machine is a device used to slit and reel the base film produced by the main line. The process design of large slitting directly affects the final reeling effect of the diaphragm, and the poor appearance of the diaphragm will affect the performance and safety of the battery. During the reeling process, the function of the pressure roller is to press the diaphragm tightly to ensure the tightness and neatness of the diaphragm. However, unreasonable hardness design of the pressure roller and inappropriate use method may cause edge sagging and dead wrinkles of the diaphragm, affecting product quality. The current large-slitting slitting has poor appearance of edge sagging and dead wrinkles in the finished product reeling, which not only seriously affects the final yield of the diaphragm production, but is also likely to cause problems in customer use after the product is delivered to the customer. Therefore, a new process method is needed to cooperate with the slitting equipment to ensure a higher final product yield. Summary of the invention

[0003] In order to improve the defects of the base film such as the drooping of the winding edge and the poor appearance of the dead wrinkles, the present application provides a large slitting process design method for improving the drooping of the winding edge and the dead wrinkles, using the following technical solutions:

[0004] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0005] S1, unwinding: the product to be cut is unwinded by the unwinding roller;

[0006] S2, flattening: using the flattening roller to flatten and convey the product to be cut unwound by the unwinding roller;

[0007] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment and slitting to obtain small rolls;

[0008] S4, winding: Control the winding pressure F of the winding roller to be 100-500N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0009] The winding roller cooperates with the winding pressure roller, and the hardness of the rubber coating of the winding roller presents a trend of increasing in a segmented gradient from the center to the edge.

[0010] By adopting the above technical solution, the design of increasing the hardness of the rubber coating of the winding roller from the center symmetrically to the two sides in sections in this application can meet the different needs of adjusting the winding of the diaphragm during winding, and effectively avoid the occurrence of sagging and dead wrinkles. In addition, the winding pressure of the winding roller is optimized, the accuracy and pertinence of the pressure control are improved, the edge sagging and dead wrinkles are effectively avoided, and the winding quality is improved. The solution of this application has significant advantages. The winding pressure of the winding roller is limited. Under the appropriate winding pressure, the air between the diaphragms can be discharged smoothly, so that the diaphragm can be rolled up smoothly, and it is not easy to cause winding wrinkles due to too low pressure.

[0011] Optionally, the flattening roller has an arc-shaped structure, and the center height of the flattening roller is ≤10 mm.

[0012] By adopting the above technical solution, preferably a flattening roller with an arc structure, the flatness of the entire base film surface can be controlled, and the height of the flattening roller can be limited, which is conducive to the flattening roller to fully flatten the base film.

[0013] Optionally, the slitting and winding speed is 100-120m / min.

[0014] By adopting the above technical solution, the speed of slitting and winding is optimized, matching the entire system and maintaining the uniformity of winding.

[0015] Optionally, the core of the winding roller used for winding in step S4 is an 8-inch or 10-inch EVA core.

[0016] By adopting the above technical solution, it is preferred to use a winding core with a winding core diameter of 8 inches or 10 inches. The relatively large winding diameter can increase the contact area between the winding pressure roller and the winding film, thereby obtaining a better winding effect.

[0017] Optionally, the diameter of the winding roller used for winding in step S4 is 120 mm-150 mm.

[0018] By adopting the above technical solution, the diameter of the winding roller is optimized. The larger diameter can increase the contact area between the winding roller and the diaphragm, thereby enabling the winding roller to have a better flattening effect on the diaphragm.

[0019] Optionally, the winding roller includes a central section, a first section, a second section and a third section, and the central axes of the winding roller of the first section, the second section and the third section located on one side of the central section are arranged sequentially, the rubber lagging hardness of the central section is H0, the rubber lagging hardness of the first section is H1, the rubber lagging hardness of the second section is H2, the rubber lagging hardness of the third section is H3, the range of H0 is 55-65°, the range of H1 is 65-75°, the range of H2 is 75-85°, and the range of H3 is 85-95°.

[0020] By adopting the above technical solution, the present application clearly divides the winding roller into four sections, and the hardness of the rubber coating on the central section, the first section, the second section and the third section increases successively. As the hardness of the rubber coating increases, the air between the diaphragms can be discharged smoothly, ensuring that the friction tension between the winding roller and the diaphragm is small, and steadily reducing the frequency of diaphragm collapse and dead wrinkles.

[0021] Optionally, the rubber coating material of the winding roller is polyurethane rubber.

[0022] Optionally, the pressures applied on both sides of the winding roller are F1 and F2 respectively. If dead wrinkles appear on the base film, the winding pressure F is increased at a frequency of 1%, and then the pressure F1 or F2 of the winding roller is adjusted. The pressure F1 or F2 on the dead wrinkle side is increased at a frequency of 1%, and the winding roller with a lower hardness of the edge section rubber coating is replaced.

[0023] By adopting the above technical solution, by increasing the winding pressure and the pressure on both sides of the winding roller, the pressure on the side where the dead wrinkles appear is increased, and the winding roller with lower hardness is replaced, the friction tension between the winding roller and the edge of the base film is increased, and the high pressure is used to suppress the occurrence of dead wrinkles in the base film, thereby improving the flatness of the base film.

[0024] Optionally, the pressures applied on both sides of the winding roller are F1 and F2 respectively. If the base film has edge sagging, the winding pressure F is lowered at a frequency of 1%, and the pressure F1 or F2 of the winding roller is adjusted again. The pressure F1 or F2 on the sagging side is reduced at a frequency of 1%, and the winding roller with a higher hardness of the edge section rubber coating is replaced.

[0025] By adopting the above technical solution, by lowering the winding pressure and the pressure on both sides of the winding roller, the pressure on the side of the winding roller where sagging occurs is reduced, the pressure on the side of the diaphragm that is sagging is reduced, and by using a winding roller with higher hardness, the friction tension between the winding roller and the edge of the base film is reduced, thereby reducing the sagging of the base film.

[0026] Optionally, the average defective rate of edge sagging and dead wrinkles after large slitting and winding can be controlled at ≤5%.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. Since the rubber coating hardness of the winding roller is optimized in this application, the contact area between the roller and the winding film roll can be guaranteed, so that the roller has a good flattening effect on the diaphragm. At the same time, the rubber coating method in which the rubber coating hardness increases from the middle to the edge is more conducive to the discharge of air between the film layers and improves the generation of dead wrinkles. The higher rubber coating hardness of the edge section ensures a relatively low friction tension between the rubber roller and the diaphragm, thereby improving the generation of poor sag.

[0029] 2. The speed of slitting and winding is optimized in this application to match the entire system and maintain the neatness of winding.

[0030] 3. In the present application, targeted adjustments are made by adjusting the winding pressure of the winding roller and the pressure at both ends of the winding pressure roller, thereby improving the accuracy and targeting of pressure control. Moreover, by optimizing the pressure roller design, the edge collapse and dead wrinkles are effectively avoided, the winding quality is improved, and it has significant advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the slitting equipment in this application;

[0032] Figure 2 It is a schematic diagram of the use of the winding roller provided in this application;

[0033] Figure 3 It is a schematic diagram of the hardness of the rubber coating of the winding roller provided in the present application;

[0034] Figure 4 It is a schematic diagram of the hardness distribution of the winding roller rubber coating provided in this application.

[0035] Explanation of the reference numerals: 1. unwinding roller; 2. passing roller; 3. flattening roller; 4. cutting roller; 5. first winding pressure roller; 6. first winding roller; 7. second winding pressure roller; 8. second winding roller; 9. winding core; 10. film roll. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the embodiments.

[0037] Example

[0038] Examples 1-4

[0039] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0040] S1, unwinding: the product to be cut is unwinded by unwinding roller 1, and the specific product to be cut is a diaphragm;

[0041] S2. Flattening: The product to be cut is conveyed to the flattening roller 3 by a plurality of rollers 2, and the product to be cut unwound from the unwinding roller 1 is flattened and conveyed by the flattening roller 3. Specifically, the number of rollers 2 is 3, and the flattening roller 3 is formed as an arc-shaped roller, and the center height of the flattening roller 3 is ≤10 mm. In this embodiment, the center height of the flattening roller 3 is 10 mm.

[0042] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment, and slitting to obtain small rolls. Specifically, the slitting roller in the slitting equipment slits the diaphragm into a first slitting roll and a second slitting roll, and the slitting and winding speed is 100 m / min;

[0043] S4, winding: Control the winding pressure F of the winding roller to be 300N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0044] Specifically, the winding roller includes a first winding roller 6 and a second winding roller 8, and the winding pressure rollers cooperating with the winding rollers include a first winding pressure roller 5 and a second winding pressure roller 7. The first slit roll obtained by slitting is conveyed to the first winding pressure roller 5 via two rollers 2, and is wound up by the first winding roller 6 to obtain a finished small roll. The second slit roll obtained by slitting is conveyed to the second winding pressure roller 7 via two rollers 2, and is wound up by the second winding roller 8 to obtain another finished small roll, wherein the winding rollers and the winding pressure rollers are both controlled by the winding system, and the winding pressure of the winding rollers is controlled to be 100N / m.

[0045] In this embodiment, the winding roller core 9 is a 10-inch EVA winding core 9, and the specification of the winding roller is a φ120mm polyurethane rubber roller. The hardness of the rubber coating of the winding roller shows a trend of increasing in a segmented gradient from the center to the edge. Specifically, the winding roller is composed of a central section, two first sections, two second sections and two third sections, and the first section, the second section and the third section located on one side of the central section are arranged along the center line of the winding roller. The rubber coating hardness of the central section is H0, the rubber coating hardness of the first section is H1, the rubber coating hardness of the second section is H1, and the rubber coating hardness of the second section is H3. In this embodiment, H0 is 55°, H1 is 65°, H2 is 75°, and H3 is 85°.

[0046] The pressures applied on both sides of the winding roller are F1 and F2 respectively. In this embodiment, F1 is 300N and F2 is 300N.

[0047] After the rolling process of this embodiment was carried out, the rolling results were tested, and the droop defect rate was 1 / 20, and the dead wrinkle defect rate was 0.

[0048] If edge wrinkles occur, first adjust the overall winding pressure F, and adjust it upward by 1% each time. Then adjust the pressure F1 (or F2) on both sides of the winding roller separately, and increase the pressure F1 (or F2) on the wrinkle side by 1% each time. Finally, replace the edge section with a rubber roller with a lower rubber hardness within the specification range, and the rubber hardness H3 is changed by 5° as a hardness specification.

[0049] If edge sagging occurs, first adjust the overall winding pressure F, and adjust it down by 1% each time. Secondly, adjust the pressure F1 (or F2) on both sides of the winding roller separately, and reduce the pressure F1 (or F2) on the sagging side by 1% each time. Finally, replace the edge section with a rubber roller with a higher rubber hardness within the specification range. The rubber hardness H3 changes every 5° as a hardness specification.

[0050] Example 5

[0051] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0052] S1, unwinding: the product to be cut is unwinded by unwinding roller 1, and the specific product to be cut is a diaphragm;

[0053] S2. Flattening: The product to be cut is conveyed to the flattening roller 3 by a plurality of rollers 2, and the product to be cut unwound from the unwinding roller 1 is flattened and conveyed by the flattening roller 3. Specifically, the number of rollers 2 is 3, and the flattening roller 3 is formed as an arc-shaped roller, and the center height of the flattening roller 3 is ≤10 mm. In this embodiment, the center height of the flattening roller 3 is 10 mm.

[0054] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment, and slitting to obtain small rolls. Specifically, the slitting roller in the slitting equipment slits the diaphragm into a first slitting roll and a second slitting roll, and the slitting and winding speed is 100 m / min;

[0055] S4, winding: Control the winding pressure F of the winding roller to be 300N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0056] Specifically, the winding roller includes a first winding roller 6 and a second winding roller 8, and the winding pressure rollers cooperating with the winding rollers include a first winding pressure roller 5 and a second winding pressure roller 7. The first slit roll obtained by slitting is conveyed to the first winding pressure roller 5 via two rollers 2, and is wound up by the first winding roller 6 to obtain a finished small roll. The second slit roll obtained by slitting is conveyed to the second winding pressure roller 7 via two rollers 2, and is wound up by the second winding roller 8 to obtain another finished small roll, wherein the winding rollers and the winding pressure rollers are both controlled by the winding system, and the winding pressure of the winding rollers is controlled to be 100N / m.

[0057] In this embodiment, the winding roller core 9 is a 10-inch EVA winding core 9, and the specification of the winding roller is a φ120mm polyurethane rubber roller. The hardness of the rubber coating of the winding roller shows a trend of increasing in a segmented gradient from the center to the edge. Specifically, the winding roller is composed of a central section, two first sections, two second sections and two third sections, and the first section, the second section and the third section located on one side of the central section are arranged along the center line of the winding roller. The rubber coating hardness of the central section is H0, the rubber coating hardness of the first section is H1, the rubber coating hardness of the second section is H1, and the rubber coating hardness of the second section is H3. In this embodiment, H0 is 55°, H1 is 65°, H2 is 75°, and H3 is 85°.

[0058] The pressures applied on both sides of the winding roller are F1 and F2 respectively. In this embodiment, F1 is 240N and F2 is 300N.

[0059] If edge wrinkles occur, first adjust the overall winding pressure F, and adjust it upward by 1% each time. Then adjust the pressure F1 (or F2) on both sides of the winding roller separately, and increase the pressure F1 (or F2) on the wrinkle side by 1% each time. Finally, replace the edge section with a rubber roller with a lower rubber hardness within the specification range, and the rubber hardness H3 is changed by 5° as a hardness specification.

[0060] If edge sagging occurs, first adjust the overall winding pressure F, and adjust it down by 1% each time. Secondly, adjust the pressure F1 (or F2) on both sides of the winding roller separately, and reduce the pressure F1 (or F2) on the sagging side by 1% each time. Finally, replace the edge section with a rubber roller with a higher rubber hardness within the specification range. The rubber hardness H3 changes every 5° as a hardness specification.

[0061] Embodiment 6-10

[0062] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0063] S1, unwinding: the product to be cut is unwinded by unwinding roller 1, and the specific product to be cut is a diaphragm;

[0064] S2. Flattening: The product to be cut is conveyed to the flattening roller 3 by a plurality of rollers 2, and the product to be cut unwound from the unwinding roller 1 is flattened and conveyed by the flattening roller 3. Specifically, the number of rollers 2 is 3, and the flattening roller 3 is formed as an arc-shaped roller, and the center height of the flattening roller 3 is ≤10 mm. In this embodiment, the center height of the flattening roller 3 is 10 mm.

[0065] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment, and slitting to obtain small rolls. Specifically, the slitting roller in the slitting equipment slits the diaphragm into a first slitting roll and a second slitting roll, and the slitting and winding speed is 100 m / min;

[0066] S4, winding: Control the winding pressure F of the winding roller to be 300N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0067] Specifically, the winding roller includes a first winding roller 6 and a second winding roller 8, and the winding pressure rollers cooperating with the winding rollers include a first winding pressure roller 5 and a second winding pressure roller 7. The first slit roll obtained by slitting is conveyed to the first winding pressure roller 5 via two rollers 2, and is wound up by the first winding roller 6 to obtain a finished small roll. The second slit roll obtained by slitting is conveyed to the second winding pressure roller 7 via two rollers 2, and is wound up by the second winding roller 8 to obtain another finished small roll, wherein the winding rollers and the winding pressure rollers are both controlled by the winding system, and the winding pressure of the winding rollers is controlled to be 100N / m.

[0068] In this embodiment, the winding core 9 of the winding roller is a 10-inch EVA winding core 9, and the specification of the winding pressure roller is a φ120mm polyurethane rubber roller. The hardness of the rubber coating of the winding roller shows a trend of increasing in a segmented gradient from the center to the edge. Specifically, the winding pressure roller is composed of a central section, two first sections, two second sections and two third sections, and the first section, the second section and the third section located on one side of the central section are arranged along the center line of the winding pressure roller. The rubber coating hardness of the central section is H0, the rubber coating hardness of the first section is H1, the rubber coating hardness of the second section is H1, and the rubber coating hardness of the second section is H3. In this embodiment, H0 is 60°, H1 is 70°, H2 is 80°, and H3 is 90°.

[0069] The pressures applied on both sides of the winding roller are F1 and F2 respectively. In this embodiment, F1 is 300N and F2 is 300N.

[0070] After rolling up by the method of this embodiment, the rolling up results were tested, and the droop defect rate was 0, and the dead wrinkle defect rate was 0.

[0071] If edge wrinkles occur, first adjust the overall winding pressure F, and adjust it upward by 1% each time. Then adjust the pressure F1 (or F2) on both sides of the winding roller separately, and increase the pressure F1 (or F2) on the wrinkle side by 1% each time. Finally, replace the edge section with a rubber roller with a lower rubber hardness within the specification range, and the rubber hardness H3 is changed by 5° as a hardness specification.

[0072] If edge sagging occurs, first adjust the overall winding pressure F, and adjust it down by 1% each time. Secondly, adjust the pressure F1 (or F2) on both sides of the winding roller separately, and reduce the pressure F1 (or F2) on the sagging side by 1% each time. Finally, replace the edge section with a rubber roller with a higher rubber hardness within the specification range. The rubber hardness H3 changes every 5° as a hardness specification.

[0073] Examples 11-14

[0074] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0075] S1, unwinding: the product to be cut is unwinded by unwinding roller 1, and the specific product to be cut is a diaphragm;

[0076] S2. Flattening: The product to be cut is conveyed to the flattening roller 3 by a plurality of rollers 2, and the product to be cut unwound from the unwinding roller 1 is flattened and conveyed by the flattening roller 3. Specifically, the number of rollers 2 is 3, and the flattening roller 3 is formed as an arc-shaped roller, and the center height of the flattening roller 3 is ≤10 mm. In this embodiment, the center height of the flattening roller 3 is 10 mm.

[0077] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment, and slitting to obtain small rolls. Specifically, the slitting roller in the slitting equipment slits the diaphragm into a first slitting roll and a second slitting roll, and the slitting and winding speed is 100 m / min;

[0078] S4, winding: Control the winding pressure F of the winding roller to be 300N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0079] Specifically, the winding roller includes a first winding roller 6 and a second winding roller 8, and the winding pressure rollers cooperating with the winding rollers include a first winding pressure roller 5 and a second winding pressure roller 7. The first slit roll obtained by slitting is conveyed to the first winding pressure roller 5 via two rollers 2, and is wound up by the first winding roller 6 to obtain a finished small roll. The second slit roll obtained by slitting is conveyed to the second winding pressure roller 7 via two rollers 2, and is wound up by the second winding roller 8 to obtain another finished small roll, wherein the winding rollers and the winding pressure rollers are both controlled by the winding system, and the winding pressure of the winding rollers is controlled to be 100N / m.

[0080] In this embodiment, the winding roller core 9 is a 10-inch EVA winding core 9, and the specification of the winding roller is a φ120mm polyurethane rubber roller. The hardness of the rubber coating of the winding roller shows a trend of increasing in a segmented gradient from the center to the edge. Specifically, the winding roller is composed of a central section, two first sections, two second sections and two third sections, and the first section, the second section and the third section located on one side of the central section are arranged along the center line of the winding roller. The rubber coating hardness of the central section is H0, the rubber coating hardness of the first section is H1, the rubber coating hardness of the second section is H1, and the rubber coating hardness of the second section is H3. In this embodiment, H0 is 65°, H1 is 75°, H2 is 85°, and H3 is 95°.

[0081] The pressures applied on both sides of the winding roller are F1 and F2 respectively. In this embodiment, F1 is 300N and F2 is 300N.

[0082] After rolling up by the method of this embodiment, the rolling up result was tested, and the droop defect rate was 0, and the dead wrinkle defect rate was 1 / 20.

[0083] If edge wrinkles occur, first adjust the overall winding pressure F, and adjust it upward by 1% each time. Then adjust the pressure F1 (or F2) on both sides of the winding roller separately, and increase the pressure F1 (or F2) on the wrinkle side by 1% each time. Finally, replace the edge section with a rubber roller with a lower rubber hardness within the specification range, and the rubber hardness H3 is changed by 5° as a hardness specification.

[0084] If edge sagging occurs, first adjust the overall winding pressure F, and adjust it down by 1% each time. Secondly, adjust the pressure F1 (or F2) on both sides of the winding roller separately, and reduce the pressure F1 (or F2) on the sagging side by 1% each time. Finally, replace the edge section with a rubber roller with a higher rubber hardness within the specification range. The rubber hardness H3 changes every 5° as a hardness specification.

[0085] Embodiment 15

[0086] The present application provides a large slitting process design method for improving the droop and dead wrinkles of the winding edge, comprising the following steps:

[0087] S1, unwinding: the product to be cut is unwinded by unwinding roller 1, and the specific product to be cut is a diaphragm;

[0088] S2. Flattening: The product to be cut is conveyed to the flattening roller 3 by a plurality of rollers 2, and the product to be cut unwound from the unwinding roller 1 is flattened and conveyed by the flattening roller 3. Specifically, the number of rollers 2 is 3, and the flattening roller 3 is formed as an arc-shaped roller, and the center height of the flattening roller 3 is ≤10 mm. In this embodiment, the center height of the flattening roller 3 is 10 mm.

[0089] S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment, and slitting to obtain small rolls. Specifically, the slitting roller in the slitting equipment slits the diaphragm into a first slitting roll and a second slitting roll, and the slitting and winding speed is 100 m / min;

[0090] S4, winding: Control the winding pressure F of the winding roller to be 300N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls;

[0091] Specifically, the winding roller includes a first winding roller 6 and a second winding roller 8, and the winding pressure rollers cooperating with the winding rollers include a first winding pressure roller 5 and a second winding pressure roller 7. The first slit roll obtained by slitting is conveyed to the first winding pressure roller 5 via two rollers 2, and is wound up by the first winding roller 6 to obtain a finished small roll. The second slit roll obtained by slitting is conveyed to the second winding pressure roller 7 via two rollers 2, and is wound up by the second winding roller 8 to obtain another finished small roll, wherein the winding rollers and the winding pressure rollers are both controlled by the winding system, and the winding pressure of the winding rollers is controlled to be 100N / m.

[0092] In this embodiment, the winding roller core 9 is a 10-inch EVA winding core 9, and the specification of the winding roller is a φ120mm polyurethane rubber roller. The hardness of the rubber coating of the winding roller shows a trend of increasing in a segmented gradient from the center to the edge. Specifically, the winding roller is composed of a central section, two first sections, two second sections and two third sections, and the first section, the second section and the third section located on one side of the central section are arranged along the center line of the winding roller. The rubber coating hardness of the central section is H0, the rubber coating hardness of the first section is H1, the rubber coating hardness of the second section is H1, and the rubber coating hardness of the second section is H3. In this embodiment, H0 is 65°, H1 is 75°, H2 is 85°, and H3 is 95°.

[0093] The pressures applied on both sides of the winding roller are F1 and F2 respectively. In this embodiment, F1 is 300N and F2 is 360N.

[0094] After rolling up by the method of this embodiment, the rolling up result was tested, and the droop defect rate was 0, and the dead wrinkle defect rate was 1 / 20.

[0095] If edge wrinkles occur, first adjust the overall winding pressure F, and adjust it upward by 1% each time. Then adjust the pressure F1 (or F2) on both sides of the winding roller separately, and increase the pressure F1 (or F2) on the wrinkle side by 1% each time. Finally, replace the edge section with a rubber roller with a lower rubber hardness within the specification range, and the rubber hardness H3 is changed by 5° as a hardness specification.

[0096] If edge sagging occurs, first adjust the overall winding pressure F, and adjust it down by 1% each time. Secondly, adjust the pressure F1 (or F2) on both sides of the winding roller separately, and reduce the pressure F1 (or F2) on the sagging side by 1% each time. Finally, replace the edge section with a rubber roller with a higher rubber hardness within the specification range. The rubber hardness H3 changes every 5° as a hardness specification.

[0097] Performance Testing

[0098] Example Left side pressure / N Right side pressure / N First station Second workstation The third station The fourth station Example 1 300 300 OK OK OK OK Example 2 300 300 OK OK OK OK Example 3 300 300 OK OK OK OK Example 4 300 300 OK OK OK OK Example 5 240 300 Collapse OK OK OK Example 6 300 300 OK OK OK OK Example 7 300 300 OK OK OK OK Example 8 300 300 OK OK OK OK Example 9 300 300 OK OK OK OK Example 10 300 300 OK OK OK OK Embodiment 11 300 300 OK OK OK OK Example 12 300 300 OK OK OK OK Example 13 300 300 OK OK OK OK Embodiment 14 300 300 OK OK OK OK Embodiment 15 300 360 OK OK OK Dead wrinkles

[0099] The embodiment is divided into 15 large mother rolls, each embodiment is divided into 5 large mother rolls, each large mother roll is cut into 4 small rolls, and a total of 60 finished rolls are rolled, of which 1 roll has poor drooping and 1 roll has poor wrinkling. The overall average defective rate of drooping and wrinkling is 2 / 60=3.3%.

[0100] 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 large slitting process design method to improve the edge droop and dead wrinkles of the winding, characterized in that: The following steps are involved: S1, unwinding: the product to be cut is unwinded from the unwinding roller (1); S2, flattening: using a flattening roller (3) to flatten and convey the product to be cut unwound from the unwinding roller (1); S3, slitting: the flattened product to be slitting is conveyed to the slitting equipment and slitting to obtain small rolls; S4, winding: Control the winding pressure F of the winding roller to be 100-500N / m, and the winding and slitting equipment cuts the small rolls to obtain finished small rolls; The winding roller cooperates with the winding pressure roller, and the hardness of the rubber coating of the winding roller presents a trend of increasing in a segmented gradient from the center to the edge.

2. A large slitting process design method for improving the droop and dead wrinkles of the winding edge according to claim 1, characterized in that: The flattening roller (3) has an arc-shaped structure, and the center height of the flattening roller (3) is ≤10 mm.

3. The large slitting process design method for improving the droop and dead wrinkles of the winding edge according to claim 1, characterized in that: The slitting and winding speed is 100-120m / min.

4. The large slitting process design method for improving the edge droop and dead wrinkles of the winding according to claim 1, characterized in that: The winding core (9) of the winding roller used for winding in step S4 is an 8-inch or 10-inch EVA winding core (9).

5. The large slitting process design method for improving the droop and dead wrinkles of the winding edge according to claim 1, characterized in that: The diameter of the winding roller used for winding in step S4 is 120mm-150mm.

6. The method for designing a large slitting process to improve the edge droop and dead wrinkles of the coiling according to claim 1, characterized in that: The winding roller includes a central section, a first section, a second section and a third section. The central axes of the winding roller of the first section, the second section and the third section located on one side of the central section are arranged sequentially. The rubber lagging hardness of the central section is H0, the rubber lagging hardness of the first section is H1, the rubber lagging hardness of the second section is H2, and the rubber lagging hardness of the third section is H3. The range of H0 is 55-65°, the range of H1 is 65-75°, the range of H2 is 75-85°, and the range of H3 is 85-95°.

7. The method for designing a large slitting process to improve the edge droop and dead wrinkles of the coiling according to claim 1, characterized in that: The rubber coating material of the winding roller is polyurethane rubber.

8. The method for designing a large slitting process to improve the edge droop and dead wrinkles of the coiling according to claim 1, characterized in that: The pressures applied on both sides of the winding roller are F1 and F2 respectively. If dead wrinkles appear on the base film, the winding pressure F is increased at a frequency of 1%, and then the pressure F1 or F2 of the winding roller is adjusted. The pressure F1 or F2 on the dead wrinkle side is increased at a frequency of 1%, and the winding roller with a lower hardness of the edge section rubber coating is replaced.

9. The method for designing a large slitting process to improve the droop and dead wrinkles of the winding edge according to claim 1, characterized in that: The pressures applied on both sides of the winding roller are F1 and F2 respectively. If the edge of the base film collapses, the winding pressure F is lowered at a frequency of 1%, and the pressure F1 or F2 of the winding roller is adjusted again. The pressure F1 or F2 on the collapsed side is reduced at a frequency of 1%, and a winding roller with a higher hardness of the edge section rubber coating is replaced.

10. The method for designing a large slitting process to improve the edge droop and dead wrinkles of the coiling according to claim 1, characterized in that: The average defective rate of edge sagging and dead wrinkles after large slitting and winding can be controlled at ≤5%.

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