Film slitting method and film slitting equipment

Abstract

The present application discloses a film slitting method and a film slitting device, and relates to the field of film material processing technology. The film slitting method comprises: respectively setting the parameters of the unwinding tension, the parameters of the initial winding tension, the parameters of the winding tension taper slope, and the preset winding length; unwinding the mother film material; obtaining the unwinding length of the mother film material in real time; slitting the mother film material to obtain the sub-film material; winding the sub-film material, and obtaining the winding length and winding tension of the sub-film material in real time; when the unwinding length is equal to the preset winding length, judging the size relationship between the winding length and the unwinding length, if the winding length is greater than or equal to the unwinding length, the winding length is qualified. The film slitting method provided by the present application can obtain sub-film materials whose winding length meets the requirements.

Description

Technical Field

[0001] The present application relates to the technical field of film material processing, and in particular to a film slitting method and a film slitting device. Background Art

[0002] With the rapid development of the new energy industry, there is an urgent need to increase the production capacity of lithium battery coating diaphragms. In order to increase the production capacity of a single line of lithium battery coating diaphragms, the production speed is generally increased or the gap time is shortened. Among them, the gap time is mainly affected by the roll change.

[0003] However, the existing diaphragm slitting process will result in insufficient diaphragm reel length, which will lead to roll change failure during the diaphragm coating process, affecting the production capacity of the coated diaphragm. Summary of the invention

[0004] The present application provides a film slitting method and a film slitting device to obtain sub-film materials with a winding length that meets requirements.

[0005] The present application provides a film slitting method, comprising:

[0006] Set the parameters of unwinding tension, initial winding tension, winding tension taper slope and preset winding length respectively;

[0007] Unwind the mother film material;

[0008] Real-time acquisition of the unwinding length of the mother film material;

[0009] Cutting the mother film material into pieces to obtain daughter film materials;

[0010] Rolling up the sub-film material, and obtaining the rolling length and the rolling tension of the sub-film material in real time;

[0011] When the unwinding length is equal to the preset winding length, the relationship between the winding length and the unwinding length is determined. If the winding length is greater than or equal to the unwinding length, the winding length is qualified.

[0012] Wherein, the unwinding tension, the initial winding tension, the winding tension and the winding tension taper slope satisfy:

[0013] FW=X*FU;

[0014] FW = FW0*[1-K*(D1-D0)];

[0015] Among them, FU represents the unwinding tension, FW0 represents the initial winding tension, FW represents the winding tension, K represents the winding tension taper slope, X represents the correlation coefficient between the winding tension FW and the unwinding tension FU, D1 represents the real-time winding diameter of the sub-film material, and D0 represents the starting winding diameter of the sub-film material.

[0016] In some possible implementations, a correlation coefficient X between the winding tension and the unwinding tension is set to 0.5≤X≤3.

[0017] In some possible implementations, the winding tension taper slope K is set to 0.1 N / m≤K≤5 N / m.

[0018] In some possible implementations, the unwinding tension FU is set to 5 N / m≤FU≤50 N / m.

[0019] In some possible implementations, the initial winding tension FW0 is set to 5N / m≤FW0≤80N / m.

[0020] In some possible implementations, when the unwinding length is equal to the preset winding length, if the winding length is less than the unwinding length, the film slitting method further includes:

[0021] The unwinding tension is reduced, the initial winding tension is increased, and the winding tension taper slope is reduced, so that when the unwinding length is equal to the preset winding length, the winding length is greater than or equal to the unwinding length.

[0022] In some possible implementations, when the unwinding length is equal to the preset winding length and the winding length is less than the unwinding length, the film slitting method includes:

[0023] The unwinding tension is adjusted to be smaller so that the winding length is greater than or equal to the unwinding length;

[0024] and / or, when the unwinding tension is at a first preset minimum value, increasing the initial winding tension so that the winding length is greater than or equal to the unwinding length;

[0025] And / or, when the unwinding tension is at a first preset minimum value and the initial winding tension is at a first preset maximum value, the winding tension taper slope is reduced so that the winding length is greater than or equal to the unwinding length.

[0026] In some possible implementations, when the winding length is qualified, the film slitting method further includes:

[0027] Determining whether the appearance of the sub-film material meets preset conditions;

[0028] If the appearance of the sub-film material does not meet the preset condition, the initial winding tension is reduced and the winding tension taper slope is increased.

[0029] In some possible implementations, if the appearance of the sub-film material does not meet the preset conditions, the film slitting method includes:

[0030] The initial winding tension is adjusted to be small so that the appearance of the sub-film material meets the preset conditions;

[0031] And / or, when the initial winding tension is at a second preset minimum value, the winding tension taper slope is increased so that the appearance of the sub-film material meets the preset condition.

[0032] In addition, the present application also provides a film slitting device, which is applied to the film slitting method provided in the above embodiments, and the film slitting device includes an unwinding unit, a slitting unit and a winding unit which are arranged in sequence.

[0033] In some possible embodiments, the slitting unit includes a support roller, a cutter and a first meter counter, the cutter is opposite to the support roller and is rotatably arranged relative to the support roller, the first meter counter is arranged in parallel on one side of the cutter, the detection end of the first meter counter is arranged toward the support roller, and the first meter counter is used to measure the winding length.

[0034] Beneficial effects of the present application: The film slitting method provided by the present application can respectively obtain the unwinding length of the mother film material and the winding length of the sub-film material, thereby accurately judging whether the winding length of the sub-film material meets the requirements, and avoiding the sub-material rolls that do not meet the requirements from being sent to subsequent process steps and affecting the production progress of subsequent process steps, thereby improving the processing efficiency of the corresponding products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 Shows a schematic diagram of the structure of a film slitting device in some embodiments;

[0037] Figure 2 Shows a schematic structural diagram of a cutting unit in some embodiments;

[0038] Figure 3A schematic flow chart of a film slitting method in some embodiments is shown.

[0039] Description of main component symbols:

[0040] 100-unwinding unit; 110-unwinding roller; 120-guide roller; 130-tension roller;

[0041] 200-slitting unit; 210-support roller; 220-cutter; 230-first meter counter;

[0042] 300 - rewinding unit; 310 - second transmission roller; 320 - contact roller; 330 - rewinding roller;

[0043] 410 - first flattening roller; 421 - first transport roller; 422 - second meter counter; 430 - second flattening roller;

[0044] 1100-master material roll; 1110-master film material; 1200-sub-material roll; 1210-sub-film material; 1300-roll core. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] like Figure 1 As shown, in the embodiment, a thin film slitting device is provided, which can be used to slitting a thin film, wherein the thin film can be a separator used in a battery.

[0051] In other embodiments, the film may also be a release film, an optical film or other structures.

[0052] like Figure 1 As shown, the film slitting device may include a frame (not shown), an unwinding unit 100, a slitting unit 200 and a rewinding unit 300. The unwinding unit 100, the slitting unit 200 and the rewinding unit 300 may be sequentially installed on the frame along the conveying direction of the film.

[0053] In some embodiments, the unwinding unit 100 may include an unwinding roller 110, a guide roller 120 and a tension roller 130 arranged in sequence along the film conveying direction. Among them, the unwinding roller 110, the guide roller 120 and the tension roller 130 are all rotatably mounted on the frame. In the embodiment, the master film roll 1100 of the master film material 1110 can be sleeved on the unwinding roller 110, and the unwinding roller 110 can be connected to a driving member, which can be used to drive the unwinding roller 110 to rotate, so as to drive the master film roll 1100 to rotate, so as to achieve unwinding. The unwound master film material 1110 can be wound around the guide roller 120 and the tension roller 130 in sequence, and conveyed to the slitting unit 200. It can be understood that the film before slitting can be referred to as the master film material 1110, and the film after slitting can be referred to as the sub-film material 1210.

[0054] In the embodiment, the positions of the guide roller 120 and the tension roller 130 on the frame are adjustable, and the unwinding tension of the mother film material 1110 can be adjusted by adjusting the positions of the guide roller 120 and the tension roller 130. In some embodiments, the guide roller 120 and the tension roller 130 can be connected to corresponding driving members. Thus, the guide roller 120 and the tension roller 130 can be driven by the corresponding driving members to move to adjust the position, thereby realizing the adjustment of the unwinding tension of the mother film material 1110, and realizing the automatic adjustment of the unwinding tension.

[0055] In some embodiments, a tension sensor may be integrated on the tension roller 130 to detect the unwinding tension of the mother film material 1110 .

[0056] In some embodiments, the film slitting device further includes a first flattening roller 410, a first transmission roller 421 and a second flattening roller 430. The first flattening roller 410, the first transmission roller 421 and the second flattening roller 430 are all rotatably mounted on the frame and can be sequentially arranged between the tension roller 130 and the slitting unit 200.

[0057] The first flattening rollers 410 may be arranged in pairs, and two pairs may be provided. The two pairs of first flattening rollers 410 may be arranged on both sides of the mother film material 1110 along the width direction of the mother film material 1110, that is, the two pairs of first flattening rollers 410 may be arranged one-to-one corresponding to the two edges of the mother film material 1110. The two first flattening rollers 410 of the same pair may be arranged on opposite sides of the mother film material 1110 along the thickness direction of the mother film material 1110. The two first flattening rollers 410 of the same pair may cooperate to flatten the edge of the mother film material 1110 so that the subsequent slitting action can be carried out smoothly.

[0058] In the embodiment, the first transmission roller 421 can be used to support the mother film material 1110 during the transmission process, and can be used to change the transmission direction of the mother film material 1110. In some embodiments, the film slitting device further includes a second meter 422, which can be arranged opposite to the first transmission roller 421, and the detection end of the second meter 422 can be oriented toward the side of the first transmission roller 421. When the mother film material 1110 passes through the first transmission roller 421, the mother film material 1110 can pass between the first transmission roller 421 and the second meter 422, so that the unwinding length of the mother film material 1110 can be detected by the second meter 422.

[0059] In some embodiments, the outer diameter of the first transport roller 421 may be set to 180 mm to 230 mm. Preferably, the outer diameter of the first transport roller 421 may be set to 190 mm to 220 mm.

[0060] In an embodiment, the axial dimension of the second flattening roller 430 may be greater than or equal to the width of the mother film material 1110 , and the second flattening roller 430 may be used to flatten the entire mother film material 1110 to facilitate subsequent slitting operations.

[0061] like Figure 1 and Figure 2 As shown, in some embodiments, the slitting unit 200 may include a support roller 210, a cutter 220 and a first meter 230. The support roller 210 is rotatably mounted on the frame. The cutter 220 may also be rotatably mounted on the frame through a structure such as a rotating shaft, and is opposite to the support roller 210. The rotation axis of the cutter 220 may be parallel to the rotation axis of the support roller 210. In the embodiment, the number of cutters 220 may be set according to the required width of the sub-film material 1210. When a plurality of cutters 220 are provided, the plurality of cutters 220 may be arranged in parallel at intervals in sequence, and the distance between two adjacent cutters 220 may be equal to the width of the sub-film material 1210. In addition, the plurality of cutters 220 may be rotatably mounted on the frame through the same rotating shaft. When the mother film material 1110 passes through the slitting unit 200 , the mother film material 1110 may pass between the support roller 210 and the cutter 220 , and the cutter 220 cuts the mother film material 1110 into sub-film materials 1210 of required width.

[0062] In the embodiment, the first meter counter 230 can be arranged opposite to the support roller 210, and the detection end of the first meter counter 230 faces the support roller 210. When the mother film material 1110 is cut by the cutting unit 200, the first meter counter 230 can detect the length of the cut sub-film material 1210 to obtain the cut length.

[0063] In some embodiments, the outer diameter of the support roller 210 may be set to 300 mm to 350 mm. Preferably, the outer diameter of the support roller 210 may be set to 310 mm to 340 mm.

[0064] In some embodiments, the number of winding units 300 can be set according to the number of the slit sub-film materials 1210, that is, one group of winding units 300 can wind up one sub-film material 1210 to obtain a corresponding sub-film roll 1200. For example, the winding units 300 can be set into two groups, three groups, or any other number of groups as needed.

[0065] In some embodiments, the winding unit 300 may include a second transmission roller 310, a contact roller 320, and a winding roller 330. The second transmission roller 310, the contact roller 320, and the winding roller 330 are all rotatably mounted on the frame, and the second transmission roller 310 and the contact roller 320 may be sequentially arranged between the slitting unit 200 and the winding roller 330. In the embodiment, the winding roller 330 may be transmission-connected to a driving member, and the driving member may drive the winding roller 330 to rotate to achieve the winding action. The contact roller 320 may be arranged close to the winding roller 330.

[0066] In some embodiments, a corresponding tension sensor may also be integrated on the winding roller 330 , which can be used to detect the winding tension of the sub-film material 1210 .

[0067] In some embodiments, an ultrasonic measuring instrument may be provided on one side of the winding roller 330 to measure the winding diameter.

[0068] In some embodiments, the contact roller 320 may be an aluminum core roller or a steel core roller covered with polyurethane, hydrogenated nitrile rubber, chlorosulfonated polyethylene rubber, or fluororubber. The outer diameter of the contact roller 320 may be set to 180 mm to 230 mm. Preferably, the outer diameter of the contact roller 320 may be set to 190 mm to 220 mm.

[0069] In some embodiments, the winding roller 330 may be provided with a winding core 1300, and the sub-film material 1210 may be wound on the winding core 1300. In the embodiment, the winding core 1300 may be a paper winding core, an acrylonitrile-styrene-butadiene copolymer (ABS) plastic winding core, or a seamless foam paper winding core wrapped with ethylene-vinyl acetate copolymer (EVA).

[0070] It can be understood that the slit sub-film material 1210 can be rolled up on the winding roller 330, and accordingly, the winding length of the sub-film material 1210 can be equal to the slitting length, and accordingly, the winding length of the sub-film material 1210 can be detected by the first meter 230.

[0071] In addition, the film slitting device also includes an electrically connected control unit (not shown) and an operating unit (not shown), and the control unit can be electrically connected to other electrical components in the film slitting device. During the film slitting process, the staff can input information such as instructions and parameters through the operating unit, and the control unit can uniformly control the operation of other electrical components in the film slitting device. In some embodiments, the operating unit can include one or more of a touch screen, a button group, and a touch key group.

[0072] In the embodiment of the present application, meter counters are respectively provided at the first transmission roller 421 and the support roller 210 of the slitting unit 200, which can measure the unwinding length and the winding length respectively, so that the winding length information can be accurately obtained to confirm whether the winding length meets the requirements, avoid the sub-roll 1200 sent to the downstream process step due to insufficient length affecting the smooth progress of the downstream process step, and ensure the processing efficiency of the downstream process. The downstream process step can be a coating step.

[0073] A film slitting method is provided in the embodiment, which can be implemented by the film slitting device provided in the embodiment.

[0074] like Figure 3 As shown, the film slitting method may include:

[0075] S101, respectively setting the parameters of the unwinding tension, the parameters of the initial winding tension, the parameters of the winding tension taper slope, and the preset winding length.

[0076] In the embodiment, the unwinding tension, the initial winding tension and the winding tension taper slope parameters can be set through the operating unit in the film slitting device, and the preset winding length can be input through the operating unit. The preset winding length can be the length of the required sub-roll 1200.

[0077] S102, unwinding the mother film material 1110.

[0078] In an embodiment, a master material roll 1100 of a master film material 1110 may be sleeved on the unwinding roller 110 .

[0079] During the processing, the driving member connected to the unwinding roller 110 can drive the unwinding roller 110 to rotate, and then drive the masterbatch roll 1100 to rotate to achieve unwinding.

[0080] S103, obtaining the unwinding tension of the mother film material 1110.

[0081] In an embodiment, the unrolled mother film material 1110 can be wound around the tension roller 130 , and the tension of the mother film material 1110 after unrolling can be detected by a tension sensor on the tension roller 130 to obtain the unrolling tension of the mother film material 1110 .

[0082] S104, trimming the mother film material 1110.

[0083] In an embodiment, the edge of the mother film material 1110 may pass between two opposite first flattening rollers 410 , and the edge of the mother film material 1110 may be flattened by the opposite first flattening rollers 410 .

[0084] S105, obtaining the unwinding length of the mother film material 1110 in real time.

[0085] In the embodiment, the mother film material 1110 can be wound around the first transmission roller 421, and the mother film material 1110 can be pulled by the first transmission roller 421. At the same time, the mother film material 1110 can pass between the first transmission roller 421 and the second meter counter 422. The second meter counter 422 can detect the unwinding length of the mother film material 1110 in real time to obtain the unwinding length of the mother film material 1110 in real time.

[0086] S106, flattening the mother film material 1110.

[0087] In the embodiment, the mother film material 1110 is wound around the second flattening roller 430 , and the second flattening roller 430 can flatten the entire width of the mother film material 1110 .

[0088] S107 , cutting the mother film material 1110 to obtain child film materials 1210 .

[0089] In the embodiment, the mother film material 1110 passes through the slitting unit 200, and the slitting unit 200 can slit the mother film material 1110 to obtain a corresponding number of sub-film materials 1210. Specifically, the mother film material 1110 can be wound on the support roller 210 and pass between the support roller 210 and the cutter 220, and the cutter 220 can slit the passing mother film material 1110 to obtain a corresponding number of sub-film materials 1210. At the same time, the first meter 230 can detect the length of the slit sub-film material 1210 to obtain the slitting length.

[0090] S108, rolling up the sub-film material 1210, and acquiring the rolling length and the rolling tension of the sub-film material 1210 in real time.

[0091] In the embodiment, the required winding core 1300 may be sleeved on the winding roller 330, and the sub-film material 1210 may be wound around the second transmission roller 310, the contact roller 320, and the winding core 1300 on the winding roller 330 in sequence, and the winding roller 330 may wind up the sub-film material 1210 so that the sub-film material 1210 is gradually wound around the winding core 1300. In some embodiments, the winding length of the sub-film material 1210 may be equal to the slitting length, and the winding length of the sub-film material 1210 may be obtained by the slitting length obtained by the first meter 230.

[0092] In the embodiment, when the winding is completed, that is, when the unwinding length is equal to the preset winding length, the size relationship between the winding length and the unwinding length can be determined. When the winding length is greater than or equal to the unwinding length, it can be determined that the winding length is qualified, that is, the length of the sub-film material 1210 in the sub-material roll 1200 is qualified and meets the requirements. When the winding length is less than the unwinding length, it is determined that the winding length is unqualified.

[0093] In the embodiment, during the film slitting process, the winding unit 300 can pull the slit sub-film material 1210, and the sub-film material 1210 can be appropriately stretched under the action of the tension. In the embodiment, the winding length of the sub-film material 1210 can be greater than or equal to the unwinding length of the mother film material 1110 by adjusting the working parameters of the film slitting device.

[0094] In some embodiments, during the winding process of the sub-film material 1210, the winding diameter of the sub-film material 1210 can be measured in real time by an ultrasonic measuring instrument, and the winding tension can be adjusted according to the winding diameter. In the embodiment, the winding tension and the winding tension taper slope can be adjusted by adjusting the speed difference between the contact roller 320 and the second transmission roller 310. In addition, the winding tension can be detected in real time by the tension sensor on the winding roller 330.

[0095] In some embodiments, the unwinding tension, the initial winding tension, the winding tension, and the winding tension taper slope satisfy:

[0096] FW=X*FU;

[0097] FW = FW0*[1-K*(D1-D0)];

[0098] Among them, FU represents the unwinding tension, FW0 represents the initial winding tension, FW represents the winding tension, K represents the winding tension taper slope, X represents the correlation coefficient between the winding tension FW and the unwinding tension FU, D1 represents the real-time winding diameter of the sub-film material 1210, and D0 represents the starting winding diameter of the sub-film material 1210.

[0099] In some embodiments, the unwinding tension FU can be set to 5N / m≤FU≤50N / m. The inventors of the present application have found through research that when the unwinding tension FU is less than 5N / m, the film cannot be fully flattened and is prone to oblique wrinkles after winding. When the unwinding tension FU is greater than 50N / m, the film will be deformed due to excessive stretching. Exemplarily, in some embodiments, the unwinding tension FU can be set to 5N / m, 8N / m, 10N / m, 15N / m, 21N / m, 26N / m, 30N / m, 35N / m, 42N / m, 45N / m, 48N / m, 50N / m or any other value from 5N / m to 50N / m. Preferably, the unwinding tension FU can be set to 8N / m≤FU≤45N / m.

[0100] In some embodiments, the initial winding tension FW0 can be set to 5N / m≤FW0≤80N / m. The inventors of the present application have found through research that when the initial winding tension FW0 is less than 5N / m, the winding end surface of the film will be uneven during the winding process, resulting in oblique wrinkles, that is, the end surface of the sub-roll 1200 is uneven and a slope is generated. When the initial winding tension FW0 is greater than 80N / m, the film will be deformed due to excessive stretching. Exemplarily, the initial winding tension FW0 can be set to 5N / m, 10N / m, 15N / m, 22N / m, 28N / m, 35N / m, 40N / m, 42N / m, 45N / m, 50N / m, 55N / m, 58N / m, 60N / m, 65N / m, 72N / m, 75N / m, 78N / m, 80N / m or any other value between 5N / m and 80N / m. Preferably, the initial winding tension FW0 is set to 10 N / m≤FW0≤60 N / m.

[0101] In some embodiments, the winding tension taper slope K can be set to 0.1N / m≤K≤5N / m. The inventors of the present application have found through research that when the winding tension taper slope K is less than 0.1N / m, it is easy to cause the sub-roll 1200 to be loose inside and tight outside after the film is rolled up, and the film in the inner layer is prone to wrinkles. When the winding tension taper slope K is greater than 5N / m, it is easy to cause excessive residual air between the film layers in the sub-roll 1200, resulting in the end surface of the sub-roll 1200 being prone to misalignment, or even the problem of unwinding. Exemplarily, the winding tension taper slope K can be set to 0.1N / m, 0.3N / m, 0.5N / m, 1.2N / m, 1.5N / m, 2.1N / m, 2.5N / m, 2.8N / m, 3N / m, 3.5N / m, 3.7N / m, 4N / m, 4.2N / m, 4.5N / m, 5N / m or any other value between 0.1N / m and 5N / m. Preferably, the winding tension taper slope K can be set to 0.5N / m≤K≤4N / m.

[0102] In some embodiments, the correlation coefficient X between the winding tension and the unwinding tension is set to 0.5≤X≤3. The inventors of the present application have found through research that when the correlation coefficient X is less than 0.5, the winding length after slitting will be less than the unwinding length, resulting in an unqualified winding length, which may lead to failure of the reel-changing and splicing in the subsequent process steps of the film (such as the coating step), affecting the processing efficiency of the corresponding product. When the correlation coefficient X is greater than 3, the winding length is greater than or equal to the unwinding length, and the winding length is qualified, but it will cause serious deformation of the film, affecting the product yield and causing the film slitting yield to decrease. Exemplarily, the correlation coefficient X between the winding tension and the unwinding tension is set to 0.5, 0.65, 0.8, 0.9, 1.2, 1.45, 1.6, 1.9, 2, 2.1, 2.5, 2.85, 3 or any other value from 0.5 to 3. Preferably, the correlation coefficient X between the winding tension and the unwinding tension is set to 0.8≤X≤2.

[0103] In some embodiments, when the winding length is unqualified, the unwinding tension can be reduced, the initial winding tension can be increased, and the winding tension taper slope can be reduced so that when the unwinding length is equal to the preset winding length, the winding length can be greater than or equal to the unwinding length.

[0104] In some embodiments, the unwinding tension may be adjusted preferentially so that the unwinding tension is gradually reduced. When the unwinding tension is adjusted within the allowable adjustment range, the rewinding length can be made greater than or equal to the unwinding length, and there is no need to adjust the initial rewinding tension and the rewinding tension taper slope. The adjustment range of the unwinding tension is 5N / m≤FU≤50N / m.

[0105] In some embodiments, when the unwinding tension has been adjusted to the first preset minimum value, the initial winding tension can be increased. When the initial winding tension is adjusted within the allowable adjustment range, the winding length can be greater than or equal to the unwinding length. Even if the winding length during the film slitting process is qualified, there is no need to adjust the winding tension taper slope. The first preset minimum value of the unwinding tension can be 5N / m. The adjustment range of the initial winding tension is 5N / m≤FW0≤80N / m.

[0106] In some embodiments, when the unwinding tension has been adjusted to the first preset minimum value and the initial winding tension has been adjusted to the first preset maximum value, the winding tension taper slope can be gradually reduced so that the winding length during the film slitting process is greater than or equal to the unwinding length, even if the winding length is qualified. Among them, the first preset maximum value of the initial winding tension is 80N / m.

[0107] In some embodiments, when the winding length is qualified, the film slitting method further comprises:

[0108] S109, determining whether the appearance of the sub-film material 1210 meets a preset condition.

[0109] In the embodiment, it can be determined whether the sub-film material 1210 has appearance defects such as waves and drooping edges by naked eye observation and / or measurement with a wave edge tester. When the sub-film material 1210 does not have appearance defects such as waves and drooping edges, it can be determined that the appearance of the sub-film material 1210 meets the preset conditions, that is, the obtained sub-film roll 1200 is qualified. When the appearance of the sub-film material 1210 does not meet the preset conditions, the initial winding tension can be reduced and the winding tension taper slope can be increased.

[0110] In some embodiments, the initial winding tension may be adjusted first, that is, the initial winding tension may be adjusted to a smaller value first. When the initial winding tension is adjusted within the allowable adjustment range, and the appearance of the sub-film material 1210 meets the preset conditions, there is no need to adjust the winding tension taper slope. The adjustment range of the initial winding tension is 5N / m≤FW0≤80N / m.

[0111] In some embodiments, when the initial winding tension is at the second preset minimum value, the winding tension taper slope can be gradually increased so that the appearance of the sub-film material 1210 meets the preset conditions. The second preset minimum value of the initial winding tension is 5N / m.

[0112] In the embodiment of the present application, the unwinding length and the winding length are detected and obtained respectively, and accurate winding length information can be obtained to accurately determine whether the winding length meets the requirements, so as to avoid the sub-material roll 1200 sent to the subsequent process not meeting the length requirements.

[0113] In addition, in the embodiment of the present application, by reasonably setting various parameters of the film slitting equipment through the film slitting method, the length of the sub-material roll processed by the film slitting equipment can meet the required requirements and meet the needs of subsequent process steps, thereby improving the processing efficiency of the corresponding product.

[0114] In the examples, the present application can be further described by the following examples. The test data of each example can be seen in Table 1.

[0115] Embodiment 1:

[0116] The preset winding length is set to 2200m, and the initial winding diameter is set to 178mm. The master roll 1100 is sleeved on the unwinding roller 110, and the unwinding roller 110 unwinds the master roll 1100. The unwinding master film material 1110 can pass through the guide roller 120 and the tension roller 130 in sequence. By adjusting the positions of the guide roller 120 and the tension roller 130, the unwinding tension FU is set to 25N / m. Then, the master film material 1110 can pass through the first flattening roller 410, the first transmission roller 421 and the second flattening roller 430 in sequence, and the unwinding length can be measured by the second meter 422. After that, the master film material 1110 can enter the slitting unit 200 for phased distribution to obtain the corresponding number of sub-film materials 1210. During this period, the slitting length (i.e., the winding length) can be detected in real time by the first meter 230. The slit sub-film material 1210 can be sequentially passed through the second transmission roller 310 and the contact roller 320, and then rolled up on the core 1300 by the winding roller 330. The core 1300 can be a seamless foam paper core of EVA. The inner diameter of the core 1300 can be set to 152mm, the wall thickness of the paper tube in the core 1300 is 8mm, and the wall thickness of the seamless foam is 5mm.

[0117] In addition, the initial winding tension FW0 can be set to 30N / m, and the winding tension taper slope can be set to 1N / m. During the winding process, the winding diameter can be collected in real time, and the winding tension will change with the change of the real-time winding diameter. After winding, the winding length is detected, the appearance of the sub-film material 1210 is recorded, and the subsequent process steps (such as the coating step) are put into use, and the roll-changing and tape-joining conditions in the subsequent process steps are recorded.

[0118] Embodiment 2:

[0119] On the basis of Example 1, the initial winding tension FW0 is adjusted to 85 N / m, and other parameters and steps remain unchanged.

[0120] Embodiment three:

[0121] On the basis of Example 1, the initial winding tension FW0 is adjusted to 12 N / m, and other parameters and steps remain unchanged.

[0122] Embodiment 4:

[0123] On the basis of Example 1, the initial winding tension FW0 is adjusted to 4.5 N / m, and other parameters and steps remain unchanged.

[0124] Embodiment five:

[0125] On the basis of Example 1, the unwinding tension FU is adjusted to 4.5 N / m, and other parameters and steps remain unchanged.

[0126] Embodiment six:

[0127] On the basis of Example 1, the unwinding tension FU is adjusted to 55 N / m, and other parameters and steps remain unchanged.

[0128] Embodiment seven:

[0129] On the basis of Example 1, the winding tension taper slope K is adjusted to 6 N / m, and other parameters and steps remain unchanged.

[0130] Embodiment eight:

[0131] On the basis of Example 1, the winding tension taper slope K is adjusted to 0.05 N / m, and other parameters and steps remain unchanged.

[0132] Table 1

[0133]

[0134] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0135] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A film slitting method, characterized in that: include: Set the parameters of unwinding tension, initial winding tension, winding tension taper slope and preset winding length respectively; Unwind the mother film material; Real-time acquisition of the unwinding length of the mother film material; Cutting the mother film material into pieces to obtain daughter film materials; Rolling up the sub-film material, and obtaining the rolling length and the rolling tension of the sub-film material in real time; When the unwinding length is equal to the preset winding length, the size relationship between the winding length and the unwinding length is determined; if the winding length is greater than or equal to the unwinding length, the winding length is qualified; and whether the appearance of the sub-film material meets the preset conditions is determined; if the appearance of the sub-film material does not meet the preset conditions, the initial winding tension is reduced; when the initial winding tension is reduced to a second preset minimum value, the winding tension taper slope is increased to make the appearance of the sub-film material meet the preset conditions; When the unwinding length is equal to the preset winding length, if the winding length is less than the unwinding length, the unwinding tension is reduced, and when the unwinding tension is reduced to a first preset minimum value, the initial winding tension is increased, and when the initial winding tension is increased to a first preset maximum value, the winding tension taper slope is reduced to make the winding length greater than or equal to the unwinding length; Wherein, the unwinding tension, the initial winding tension, the winding tension and the winding tension taper slope satisfy: FW=X*FU; Wherein, FU represents the unwinding tension, FW represents the winding tension, X represents the correlation coefficient between the winding tension FW and the unwinding tension FU, and the correlation coefficient X between the winding tension and the unwinding tension is set to 0.5≤X≤3.

2. The film slitting method according to claim 1, characterized in that: The unwinding tension FU is set to 5N / m≤FU≤50N / m.

3. A film slitting device, characterized in that: Applied to the film slitting method according to claim 1 or 2, the film slitting equipment comprises an unwinding unit, a slitting unit and a winding unit which are arranged in sequence.

4. The film slitting device according to claim 3, characterized in that: The slitting unit includes a supporting roller, a cutter and a first meter counter. The cutter is opposite to the supporting roller and is rotatably arranged relative to the supporting roller. The first meter counter is arranged in parallel on one side of the cutter. The detection end of the first meter counter is arranged toward the supporting roller. The first meter counter is used to measure the winding length.

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