A method of slitting and winding an aluminum foil

Abstract

The application discloses an aluminum foil slitting and winding method and belongs to the technical field of aluminum processing and slitting. The aluminum foil slitting and winding method comprises the following steps: S1, determining a normal winding tension; S2, controlling the starting bottoming tension of a slitting and winding machine to be 60-80% of the normal winding tension, setting the slitting speed acceleration to be greater than or equal to 0.04 m / s 2 ; and S3, when the slitting speed rises to 80-100 m / min, setting the tension to be the normal winding tension, and winding the large aluminum foil into small aluminum foils. According to the aluminum foil slitting and winding method, when the finished product large aluminum foil is wrinkled due to the bad plate shape of raw materials, the technical problem of slitting and winding bottoming wrinkling is solved under the premise of preventing tower type and slipping, so that the quality loss is reduced and the yield is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum processing, and more particularly to an aluminum foil slitting and winding method. BACKGROUND

[0002] Aluminum foil can be widely applied to the fields of packaging materials, electrolytic capacitor materials, thermal insulation materials, battery current collectors, etc.

[0003] Aluminum foil is a 0.2 mm or less thick aluminum roll formed by cold rolling of a blank. After general aluminum foil cold rolling, cleaning is performed, and then the finished large roll is slitted into various different width specifications, a sleeve is used as a roll core, and a small roll aluminum foil of a size required by a customer is wound, and then packaged and shipped.

[0004] Ideally, the incoming plate shape of the finished large roll aluminum foil is flat, without wave, drumming, etc. From the unwinding machine, the unwinding line is a straight line. However, in actual production, as shown in FIG. 1, the plate shape of the incoming aluminum foil of most finished large rolls is not flat, and under the action of the winding and bottoming tension, the aluminum foil is ribbed. If the ribbing phenomenon is relatively serious, the bottoming wrinkle as shown in FIG. 2 occurs when passing through the guide roller or the winding shaft. The thinner the aluminum foil, the more prone to wrinkle. If the bottoming wrinkle occurs, the outer several hundred layers of the winding are affected, resulting in a large amount of scrap. Figure 1 Figure 2 In the process of slitting and winding of the finished large roll aluminum foil, when the inner core part of the finished large roll aluminum foil is relatively loose, and the part close to the outer side is relatively tight, the finished large roll aluminum foil will slip and be tower-shaped, and layer-to-layer scratches are caused. The small roll aluminum foil after slitting is prone to gradually tilt from the roll core to the roll surface, and looks like a horizontally placed tower, as shown in FIG. 3, which is called tower-shaped.

[0005] In the prior art “Influence of the Slitting and Winding Process on the Quality of Finished Double-Zero Aluminum Foil Material”, the key process control parameters of the slitting and winding machine are tension, speed, tension gradient, and flattening pressure. It is recorded that the tension includes unwinding tension and winding tension, and the function of the unwinding tension is to provide a stable slitting environment, which generally does not affect the quality of the winding end face. The general selection principle of the unwinding tension is slightly less than the winding tension of the previous rolling machine. However, it does not disclose how to solve the technical problem of the bottoming wrinkle of the slitting and winding aluminum foil small roll under the premise of preventing tower-shaped and slipping when the incoming plate shape of the finished large roll is defective and the bottoming wrinkle occurs. Figure 3

[0006] The present application relates to the technical field of aluminum processing, and more particularly to an aluminum foil slitting and winding method. SUMMARY

[0007] ​​The technical problem to be solved by the present application is to overcome the defects and deficiencies that the existing aluminum foil slitting and winding process cannot solve the large roll aluminum foil slitting and winding, and to provide an aluminum foil slitting and winding method, which can effectively prevent the aluminum foil small roll from being wrinkled.

[0008] The above-mentioned purpose of the present application is realized by the following technical solutions.

[0009] An aluminum foil slitting and winding method comprises the following steps:

[0010] S1. Determine the normal winding tension;

[0011] S2. Control the starting bottoming tension of the slitting and winding machine to be 60-80% of the normal winding tension, and set the slitting speed acceleration to be greater than or equal to 0.04 m / s 2 .

[0012] S3. When the slitting speed rises to 80-100 m / min, set the tension to the normal winding tension, and slit and wind the large roll aluminum foil into a small roll aluminum foil.

[0013] In the art, the normal winding tension is generally 20-30 MPa.

[0014] The present application solves the problem of slitting and winding bottoming wrinkles by controlling the starting bottoming tension of the slitting and winding machine. The greater the tension, the more serious the ribbing. Reducing the starting bottoming tension can effectively solve the ribbing phenomenon and prevent wrinkles. However, if the starting bottoming tension is too small compared with the normal winding tension, the sleeve is prone to slip, which makes it difficult to complete the bottoming smoothly.

[0015] If the slitting speed acceleration is too small, when the speed rises to 80-100 m / min, the tension is set to the normal winding tension. At this time, the number of aluminum foils with small bottoming tension is too large, and after increasing the tension, the aluminum foils are prone to slip and scratch or form a tower shape. The present application sets the slitting speed acceleration to be greater than or equal to 0.04 m / s 2 . By controlling the slitting speed acceleration, the number of aluminum foils with small bottoming tension can be controlled, thereby preventing slipping and scratching or forming a tower shape.

[0016] The present application controls the slitting speed to rise to 80-100 m / min, and then sets the tension to the normal winding tension. At this time, the length of the winding part with the small tension is small, which is not enough to cause the winding tower type and slip. Moreover, after the slitting speed is ≥80 m / min, under the effect of the speed effect, the aluminum foil is quickly wound, and more air is brought in. When the air is expelled out of the aluminum foil at the guide roller or the calender roller, the air brought in plays the role of air cushion flattening at the uneven ridge of the aluminum foil, and the ridge will not produce wrinkles. When the slitting speed rises to >100 m / min, and then the tension is set to the normal winding tension. At this time, the number of the aluminum foil with the small tension is too large, and after the tension is increased, the aluminum foil is prone to slip and scratch or tower type due to the tight inside and the loose outside.

[0017] Preferably, in step S2, the slitting speed acceleration is set to 0.04-1.3 m / s 2 .

[0018] More preferably, in step S2, the slitting speed acceleration is set to 0.05-0.5 m / s 2 .

[0019] Further preferably, in step S2, the slitting speed acceleration is set to 0.05-0.1 m / s 2 .

[0020] Optionally, in step S3, after the slitting speed rises to 80-100 m / min, the length of the aluminum foil wound with the small tension is <30 m.

[0021] In the present application, the speed-up time is calculated according to the speed and the acceleration, and the length of the wound aluminum foil is calculated according to the time and the acceleration.

[0022] Optionally, the pressure of the calender roller of the slitting and winding machine is 30-90 kg.

[0023] Optionally, the normal winding tension is selected according to one or more of the thickness, the width, or the tensile strength of the small aluminum foil.

[0024] Optionally, the normal slitting speed is selected according to one or more of the thickness, the design capacity of the equipment, etc.

[0025] Preferably, the thickness of the large aluminum foil is less than 0.1 mm.

[0026] The thinner the thickness, the easier the wrinkles. When the thickness of the large aluminum foil is less than 0.1 mm, the aluminum foil slitting and winding method of the present application is more beneficial to solve the technical problem of the wrinkles of the slitting and winding with the small tension under the premise of preventing the tower type and the slip.

[0027] Preferably, the width of the small aluminum foil is 200-800 mm.

[0028] The aluminium foil slitting and winding method of the present application is especially suitable for slitting and winding of the small winding aluminium foil with the width of 300-600mm.

[0029] Preferably, the winding diameter of the small winding aluminium foil is 100-1000mm.

[0030] The aluminium foil slitting and winding method of the present application is especially suitable for slitting and winding of the small winding aluminium foil with the winding diameter of 100-600mm.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] The present application discloses an aluminium foil slitting and winding method, comprising the following steps: S1. determining normal winding tension; S2. controlling the starting bottoming tension of the slitting and winding machine to be 60-80% of the normal winding tension, setting the slitting speed acceleration≥0.04m / s 2 ; S3. when the slitting speed rises to 80-100m / min, setting the tension to the normal winding tension, and slitting and winding the large winding aluminium foil into small winding aluminium foil. The aluminium foil slitting and winding method of the present application solves the technical problem of slitting and winding bottoming wrinkling under the premise of preventing tower type and slipping, thereby reducing the loss and improving the yield. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Picture of the finished large winding sheet shape.

[0034] Figure 2 Picture of the aluminium foil with bottoming wrinkling.

[0035] Figure 3 Actual picture of the aluminium foil with tower type.

[0036] Figure 4 Picture of the aluminium foil without bottoming wrinkling. DETAILED DESCRIPTION

[0037] The present application will be further described in conjunction with the specific embodiments, but the embodiments do not limit the present application in any form. Unless otherwise specified, the aluminium foil used in the embodiments of the present application is the conventional battery aluminium foil.

[0038] Large winding aluminium foil raw material: battery aluminium foil alloy 8021, the width of the finished large winding is 1160mm, and the thickness is 0.04mm. The width of the slitting small winding aluminium foil is set to 550mm, the thickness is 0.04mm, two strips are slitted, and the winding diameter is 400-600mm. The sheet shape of the large winding has the bad condition, 8 waves per m, and the wave height is 5.0mm.

[0039] Example 1

[0040] An aluminum foil slitting and winding method comprises the following steps:

[0041] S1. The normal winding tension is determined as 20 MPa;

[0042] S2. The initial bottoming tension of the slitting and winding machine is controlled as 16 MPa, i.e. the initial bottoming tension is 80% of the normal winding tension, and the slitting speed acceleration is set as 0.05 m / s 2 ;

[0043] S3. When the slitting speed rises to 80 m / min, the tension is set as the normal winding tension 20 MPa, and the large roll aluminum foil is slitted and wound into small roll aluminum foils;

[0044] The ironing roller pressure is 80 kg.

[0045] Example 2

[0046] An aluminum foil slitting and winding method comprises the following steps:

[0047] S1. The normal winding tension is determined as 20 MPa;

[0048] S2. The initial bottoming tension of the slitting and winding machine is controlled as 14 MPa, i.e. the initial bottoming tension is 70% of the normal winding tension, and the slitting speed acceleration is set as 0.05 m / s 2 ;

[0049] S3. When the slitting speed rises to 80 m / min, the tension is set as the normal winding tension 20 MPa, and the large roll aluminum foil is slitted and wound into small roll aluminum foils;

[0050] The ironing roller pressure is 80 kg.

[0051] Different from example 1, in step S2, the initial bottoming tension is 14 MPa, i.e. the initial bottoming tension is 70% of the normal winding tension.

[0052] Example 3

[0053] An aluminum foil slitting and winding method comprises the following steps:

[0054] S1. The normal winding tension is determined as 20 MPa;

[0055] S2. The initial bottoming tension of the slitting and winding machine is controlled as 12 MPa, i.e. the initial bottoming tension is 60% of the normal winding tension, and the slitting speed acceleration is set as 0.10 m / s 2 ;

[0056] S3. When the slitting speed rises to 80 m / min, the tension is set as the normal winding tension 20 MPa, and the large roll aluminum foil is slitted and wound into small roll aluminum foils;

[0057] The ironing roller pressure is 80 kg.

[0058] Different from example 1, in step S2, the starting base-up tension is 12 MPa, i.e. the starting base-up tension is 60% of the normal winding tension, and the slitting speed acceleration is set to 0.10 m / s 2 .

[0059] Example 4

[0060] An aluminum foil slitting and winding method, comprising the following steps:

[0061] S1. determining the normal winding tension as 20 MPa;

[0062] S2. controlling the starting base-up tension of the winding machine as 16 MPa, i.e. the starting base-up tension is 80% of the normal winding tension, and setting the slitting speed acceleration as 0.05 m / s 2 ;

[0063] S3. when the slitting speed rises to 100 m / min, setting the tension as the normal winding tension 20 MPa again, and slitting and winding the large roll of aluminum foil into small rolls of aluminum foil;

[0064] The ironing roller pressure is 80 kg.

[0065] Different from example 1, in step S3, when the slitting speed rises to 100 m / min, the tension is set as the normal winding tension 20 MPa again.

[0066] Comparative example 1

[0067] An aluminum foil slitting and winding method, comprising the following steps:

[0068] S1. determining the normal winding tension as 20 MPa;

[0069] S2. controlling the starting base-up tension of the winding machine as 20 MPa, i.e. the starting base-up tension = the normal winding tension, and setting the slitting speed acceleration as 0.05 m / s 2 ;

[0070] S3. when the slitting speed rises to 80 m / min, the length of the aluminum foil wound by base-up winding is < 30 m, setting the tension as the normal winding tension 20 MPa again, and slitting and winding the large roll of aluminum foil into small rolls of aluminum foil;

[0071] The ironing roller pressure is 80 kg.

[0072] Different from example 1, in step S2, the starting base-up tension is 20 MPa, i.e. the starting base-up tension = the normal winding tension.

[0073] Comparative example 2

[0074] An aluminum foil slitting and winding method, comprising the following steps:

[0075] S1. Determine the normal winding tension as 20 MPa;

[0076] S2. Control the starting bottoming tension of the slitting and winding machine as 30 MPa, i.e. the starting bottoming tension is 150% of the normal winding tension, and set the slitting speed acceleration as 0.05 m / s 2 ;

[0077] S3. When the slitting speed rises to 80 m / min, set the tension as the normal winding tension 20 MPa again, and wind the large roll aluminum foil into small roll aluminum foil;

[0078] Wherein, the ironing roller pressure is 80 kg.

[0079] The difference from Example 1 is that in step S2, the starting bottoming tension is 30 MPa, i.e. the starting bottoming tension is 150% of the normal winding tension.

[0080] Comparative Example 3

[0081] An aluminum foil slitting and winding method, comprising the following steps:

[0082] S1. Determine the normal winding tension as 20 MPa;

[0083] S2. Control the starting bottoming tension of the slitting and winding machine as 6 MPa, i.e. the starting bottoming tension is 30% of the normal winding tension, and set the slitting speed acceleration as 0.05 m / s 2 ;

[0084] S3. When the slitting speed rises to 80 m / min, set the tension as the normal winding tension 20 MPa again, and wind the large roll aluminum foil into small roll aluminum foil;

[0085] Wherein, the ironing roller pressure is 80 kg.

[0086] The difference from Example 1 is that in step S2, the starting bottoming tension is 6 MPa, i.e. the starting bottoming tension is 30% of the normal winding tension.

[0087] Comparative Example 4

[0088] An aluminum foil slitting and winding method, comprising the following steps:

[0089] S1. Determine the normal winding tension as 20 MPa;

[0090] S2. Control the starting bottoming tension of the slitting and winding machine as 15 MPa, i.e. the starting bottoming tension is 75% of the normal winding tension, and set the slitting speed acceleration as 0.005 m / s 2 ;

[0091] S3. When the slitting speed rises to 80 m / min, the tension is set to the normal winding tension 20 MPa, and the large roll of aluminum foil is slitted and wound into a small roll of aluminum foil;

[0092] The ironing roller pressure is 80 kg.

[0093] The difference from Example 1 is that in step S2, the initial bottoming tension is 15 MPa, which is 75% of the normal winding tension, and the slitting speed acceleration is set to 0.005 m / s 2 .

[0094] Comparative Example 5

[0095] An aluminum foil slitting and winding method comprises the following steps:

[0096] S1. The normal winding tension is determined to be 20 MPa;

[0097] S2. The initial bottoming tension of the slitting machine is controlled to be 20 MPa, i.e., the initial bottoming tension = the normal winding tension, and the slitting speed acceleration is set to 0.5 m / s 2 ;

[0098] S3. When the slitting speed rises to 80 m / min, the tension is set to the normal winding tension 20 MPa, and the large roll of aluminum foil is slitted and wound into a small roll of aluminum foil;

[0099] The ironing roller pressure is 80 kg.

[0100] The difference from Example 1 is that in step S2, the initial bottoming tension is 20 MPa, which is the normal winding tension, and the slitting speed acceleration is 0.5 m / s 2 .

[0101] Comparative Example 6

[0102] An aluminum foil slitting and winding method comprises the following steps:

[0103] S1. The normal winding tension is determined to be 20 MPa;

[0104] S2. The initial bottoming tension of the slitting machine is controlled to be 16 MPa, i.e., the initial bottoming tension is 80% of the normal winding tension, and the slitting speed acceleration is set to 0.05 m / s 2 ;

[0105] S3. When the slitting speed rises to 60 m / min, the tension is set to the normal winding tension 20 MPa, and the large roll of aluminum foil is slitted and wound into a small roll of aluminum foil;

[0106] The ironing roller pressure is 80 kg.

[0107] The difference from Example 1 is that in step S3, when the slitting speed rises to 60 m / min, the tension is set to the normal winding tension of 20 MPa.

[0108] Comparative Example 7

[0109] An aluminum foil slitting and winding method, comprising the following steps:

[0110] S1. The normal winding tension is determined to be 20 MPa;

[0111] S2. The starting bottoming tension of the slitting and winding machine is controlled to be 16 MPa, i.e. the starting bottoming tension is 80% of the normal winding tension, and the slitting speed acceleration is set to 0.05 m / s 2 ;

[0112] S3. When the slitting speed rises to 180 m / min, the tension is set to the normal winding tension of 20 MPa, and the large roll of aluminum foil is slitted and wound into a small roll of aluminum foil;

[0113] The ironing roller pressure is 80 kg.

[0114] The difference from Example 1 is that in step S3, when the slitting speed rises to 180 m / min, the tension is set to the normal winding tension of 20 MPa.

[0115] Result detection

[0116] The aluminum foil slitting and winding results of the above examples and comparative examples are obtained by field observation: if any one of wrinkling, tower type, and slipping occurs, the slitting and winding result is unqualified (NG). If none of the above occurs, the slitting and winding result is qualified (OK). The picture of aluminum foil without bottoming wrinkling is shown in Figure 4 .

[0117] The specific detection results are shown in Table 1 below:

[0118] Table 1

[0119]

[0120] From the above data, it can be seen that the aluminum foil slitting and winding method of the present application solves the technical problem of slitting and winding bottoming wrinkling when the incoming material of the finished product large roll has a bad plate type and prevents tower type and slipping, the slitting and winding is qualified, the loss is reduced, and the yield is improved.

[0121] From Comparative Example 1, it can be seen that the starting bottoming tension = the normal winding tension, and the problem of bottoming wrinkling is not solved.

[0122] From the comparative example 2, it can be seen that the starting priming tension is greater than the normal winding tension, and the priming wrinkling problem cannot be solved.

[0123] From the comparative example 3, it can be seen that the starting priming tension is too small compared with the normal winding tension, and the sleeve is prone to slip and the tower type is caused, so that the priming cannot be completed smoothly.

[0124] From the comparative example 4, it can be seen that although the starting priming tension is 75% of the normal winding tension, the slitting speed acceleration is too low, when the slitting speed rises to 80 m / min, the length of the slitting priming winding is 178 m, at this time, the tension is set to the normal winding tension, that is, the total length of the aluminum foil wound under the small priming tension is too much, that is, the number of the aluminum foil wound under the small priming tension is too much, and then the tension is increased, so that the slip and the tower type are caused due to the typical inner looseness and outer tightness.

[0125] From the comparative example 5, it can be seen that the starting priming tension is equal to the normal winding tension, and even if the higher slitting speed acceleration is used, the priming wrinkling problem cannot be solved.

[0126] From the comparative example 6, it can be seen that when the slitting speed rises to 60 m / min, the tension is set to the normal winding tension 20 MPa, the speed effect generated by the speed of 60 m / min is not strong enough, and the winding is still wrinkled.

[0127] From the comparative example 7, it can be seen that when the slitting speed rises to 180 m / min, the tension is set to the normal winding tension 20 MPa, the slitting priming length is 90 m, at this time, the tension is set to the normal winding tension, that is, the total length of the aluminum foil wound under the small priming tension is too much, that is, the number of the aluminum foil wound under the small priming tension is too much, and then the tension is increased, so that the slip and the tower type are caused due to the typical inner looseness and outer tightness.

[0128] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An aluminum foil slitting and winding method characterized by comprising: The method comprises the following steps: S1. determining normal winding tension; S2. Control the starting bottoming tension of the dividing machine to be 60-80% of the normal winding tension, and set the dividing speed acceleration to be 0.05-0.1 m / s 2 ; S3. after the slitting speed rises to 80-100 m / min, setting the tension to the normal winding tension again, and winding the large roll of aluminum foil into small rolls of aluminum foil.

2. The method of slitting and winding an aluminum foil according to claim 1, wherein In step S3, after the slitting speed rises to 80-100 m / min, the length of the aluminum foil wound by the backing is less than 30 m.

3. The method of slitting and winding an aluminum foil according to claim 1, wherein In step S1, the normal winding tension is selected according to one or more of the thickness, width or tensile strength of the required small roll of aluminum foil.

4. The method of slitting and winding an aluminum foil according to claim 1, wherein The thickness of the large roll of aluminum foil is less than 0.1 mm.

5. The method of slitting and winding an aluminum foil according to claim 1, wherein The width of the small roll of aluminum foil is 200-800 mm.

6. The method of slitting and winding an aluminum foil according to claim 1, wherein The winding diameter of the small roll of aluminum foil is 100-1000 mm.

Images