Control method for eliminating end face staggered layer after annealing of aluminum foil

Abstract

The invention discloses a control method for eliminating staggered layers of the end face of an aluminum foil after annealing, which comprises the following steps: S1, slitting an aluminum foil roll to ensure that the coiling density of the aluminum foil roll is controlled at 2.45-2.55 kg / m; s2, the slit aluminum foil coil is put into a furnace to be subjected to oil removal annealing, and the cooling speed of an annealing cooling section is required to be smaller than or equal to 3 DEG C / h; and S3, the aluminum foil coil is taken out of the furnace and placed in a cooling area, the cooling area is covered with a heat preservation cover, the difference between the temperature of the aluminum foil coil and the environment temperature of the cooling area cover is smaller than or equal to 40 DEG C, and the cooling rate of the aluminum foil coil is smaller than or equal to 4 DEG C / h. According to the method, the internal and external temperature difference of the aluminum foil roll is smaller than or equal to 5 DEG C, the shrinkage speed difference of the aluminum foil roll during cooling is reduced, deformation stress concentration in the cooling shrinkage process is reduced, and therefore axial sliding between layers of the aluminum foil is reduced, and end face staggered layers of the aluminum foil roll are eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-thin aluminum foil production, and in particular relates to a control method for eliminating rear end dislocation of aluminum foil after annealing. Background Art

[0002] Aluminum foil has the advantages of moisture-proof, airtight, light-shielding, abrasion-resistant, fragrance-retaining, non-toxic and odorless. Especially after aluminum foil is compounded with plastic and paper, the shielding property of aluminum foil is integrated with the strength of paper and the heat sealing property of plastic, which further improves the shielding performance against water vapor, air, ultraviolet rays and bacteria, which is necessary as a packaging material, and becomes an important material in the packaging industry such as food, medicine and cigarettes.

[0003] After the aluminum foil is cut, it needs to be annealed to remove the residual rolling oil and stress on the surface of the aluminum foil and make the aluminum foil reach certain performance. The usual annealing process of aluminum foil is: heating to 190-250℃ for 10-30h, keeping warm for 10-400h; then cooling to 100℃ for 10-30h before taking out of the furnace and cooling naturally.

[0004] The aluminum foil roll expands due to heat during the annealing process, and contracts due to cooling during the cooling process. During annealing, the temperature of the aluminum foil roll gradually increases from the outside to the inside, and the aluminum foil roll gradually expands from the outside to the inside due to heat, so the deformation stress will not be concentrated. When the aluminum foil roll is cooled after annealing, the temperature of the aluminum foil roll gradually decreases from the outside to the inside, and the aluminum foil roll gradually contracts from the outside to the inside when it cools down. The deformation stress gathers inside the roll and is relatively large. The cooling process of the aluminum foil roll is from the outside to the inside, and the cooling rate of the aluminum foil roll shows a decreasing trend from the outside to the inside. The closer to the inside of the aluminum coil, the slower the cooling rate. The faster the cooling rate of the outside of the aluminum foil roll, the greater the temperature difference between the inside and outside of the roll, the greater the difference in the cooling and shrinking speed, and the deformation stress will increase sharply. Under the action of huge deformation stress, the aluminum foil roll will partially slide axially, resulting in end face staggered (see attached for staggered conditions). Figure 1 ).

[0005] In addition to the fact that the annealing cooling rate of the aluminum foil roll is too fast, which will cause the end face misalignment, the coiling density of the aluminum foil roll also has a great impact. The increase in coiling density increases the friction between the aluminum foil layers, which is conducive to improving the end face misalignment. However, if the coiling density is too high, the gap between the aluminum foil rolls will become smaller, which will make it difficult to remove oil from the surface of the aluminum foil roll, or even uneven oil removal; if the coiling density of the aluminum foil roll is too low, the friction between the aluminum foil layers will be smaller, and the end face misalignment will be more likely to occur, and serious cases will cause loose rolls; therefore, how to eliminate annealing heat bulging and end face misalignment at the same time requires appropriate slitting coiling density and annealing cooling rate.

[0006] The aluminum foil at the misaligned position on the end face will slide axially, causing surface contusion. When customers use it at the misaligned position, quality defects such as broken foil, holes, and wrinkles will occur, which will seriously affect product quality, cause a large loss of raw materials, and affect production efficiency and costs.

[0007] Patent document CN117187537A discloses a method for eliminating the heat drum of aluminum foil annealing. Before annealing, the outer periphery of the aluminum foil roll is wrapped with an aromatic fiber insulation layer, and both ends of the aluminum foil roll are exposed. The material of the aromatic fiber insulation layer is 100% modified fiber, which has a good insulation effect and can greatly reduce the temperature difference inside the aluminum foil roll, thereby eliminating the annealing heat drum, and there is no need to reduce the temperature difference inside the aluminum foil roll by heating for a long time. However, the document does not specify the annealing cooling rate and the cooling rate after annealing, and still cannot eliminate the rear end face dislocation of the aluminum foil annealing.

[0008] Patent document CN102465243A discloses a method for preventing double-zero aluminum foil from lifting after it is taken out of the furnace. The double-zero aluminum foil roll taken out of the furnace after annealing is placed on the ground, and then covered with an insulation cover as a whole. After slowly cooling to the required temperature, the insulation cover is removed. This document only considers the use of an insulation cover to slow down the cooling rate of the aluminum foil roll after it is taken out of the furnace, but does not consider the influence of the coiling density of the aluminum foil roll on the end face staggering and annealing lifting. Therefore, only about 70% of lifting can be eliminated, and the end face staggering cannot be eliminated. Moreover, the lifting of the aluminum foil roll surface during annealing is caused by the end face of the aluminum roll first being heated and expanded during the heating process, and the diameter increases, which generates a component force pointing to the middle of the aluminum roll, causing the surface of the middle of the aluminum roll to extrude a bulge; during the cooling process, the end face of the aluminum roll first cools and shrinks, and the diameter decreases, generating a tensile stress pointing to the end face, which has a tendency to reduce the hot gas lifting. Therefore, lifting is caused by the heating process, and the cooling process will reduce the degree of lifting. This document does not point out the specific process of lifting, but simply concludes that lifting will occur as long as the stress changes.

[0009] Patent document CN102560294A discloses an aluminum foil annealing process, including three stages: heating, heat preservation, and cooling. In the heating stage, the heating rate is 2-12°C / hour, in the heat preservation stage, the heat preservation temperature is 180-210°C, the heat preservation time is 50-140 hours, and in the cooling stage, the cooling rate is 0.5-12°C / hour. This document only adjusts the heat preservation temperature and heat preservation time by controlling the heating and cooling rates to eliminate compressive stress, thereby reducing the probability of causing hot drum. It also does not consider the influence of the coiling density of the aluminum foil roll on the end face staggering and annealing hot drum.

[0010] The prior art does not yet have a complete production process to control the staggered problem of the aluminum foil coil from the perspective of coiling density, annealing cooling section, and cooling speed during furnace cooling. Summary of the invention

[0011] The purpose of the present invention is to provide a control method for eliminating the staggered layer of the rear end of aluminum foil annealing, by controlling the coiling density of the aluminum foil roll and the speed of the cooling section and the furnace cooling during the annealing of the finished product, the temperature difference between the inside and outside of the aluminum coil is ensured to be ≤6°C, and a large amount of shrinkage deformation stress is avoided to accumulate, so as to achieve the effect of reducing or eliminating the staggered layer of the aluminum foil roll.

[0012] The purpose of the present invention is achieved through the following technical solutions:

[0013] A control method for eliminating rear face staggering of aluminum foil after annealing of the present invention comprises the following steps:

[0014] S1, slitting aluminum foil rolls to ensure that the coiling density of the aluminum foil rolls is controlled at 2.45-2.55 kg / m 3 ;

[0015] S2, degreasing and annealing the slit aluminum foil coiling furnace, the cooling rate of the annealing cooling section should be ≤3℃ / h;

[0016] S3, take the aluminum foil roll out of the furnace, place it in a cooling area, and cover the cooling area with a heat preservation cover, so that the difference between the temperature of the aluminum foil roll and the ambient temperature of the cooling area cover is ≤40°C, and the cooling rate of the aluminum foil roll is ≤4°C / h (preferably, the cooling rate of the aluminum foil roll is ≤3°C / h).

[0017] In this industry, winding density = actual coil weight / actual volume. Because there are gaps between layers, the winding density will be lower than the metal density of the aluminum foil. If the winding density is too small, the friction between the aluminum foil layers is small, and inter-layer sliding, misalignment or loose winding is likely to occur. As the winding density increases, the friction between the aluminum foil layers increases, which is beneficial to improving the end face misalignment. However, if the winding density is too large, the gap between the aluminum coils becomes smaller, which will make it difficult to remove oil from the surface of the aluminum coil, or even uneven oil removal. Therefore, the present invention has found in the mass production process that the winding density of the aluminum foil coil is controlled at 2.45-2.55 kg / m 3 The cooling rate of the annealing cooling section should be ≤3℃ / h, the difference in ambient temperature should be ≤40℃, the cooling rate of the aluminum foil coil should be ≤4℃ / h, and the temperature difference between the inside and outside of the aluminum coil should be ≤6℃, which can effectively eliminate the end face stagger.

[0018] When the aluminum foil roll is cooled in step S3 until the temperature difference between the end surface of the aluminum foil roll and the ambient temperature is ≤30°C, the heat preservation cover can be opened to allow the aluminum foil roll to cool naturally. Of course, the heat preservation cover can be kept open to continue cooling under heat preservation, but the production efficiency will be reduced.

[0019] Preferably, since the ambient temperature is much lower than the temperature of the aluminum foil coil out of the oven, the out-of-the-oven time of step S3 should be controlled within 60 minutes to prevent the temperature difference with the ambient temperature from being ≥40°C for a long time, which may cause a large amount of deformation stress to accumulate.

[0020] Preferably, the heat preservation cover is made of 300g / m 2The above-mentioned absorbent flannel, such as polyester fiber flannel, wool flannel, nylon fiber flannel; the insulation cover is to reduce the temperature difference between the aluminum foil roll and the atmospheric environment, and prevent the aluminum foil from oxidizing due to condensation water on the surface of the aluminum foil roll when the ambient temperature is too low; the gap of the insulation cover should be reduced as much as possible to ensure its insulation effect.

[0021] Preferably, before annealing, a high temperature resistant heat-insulating material can be used to wrap the middle of the outer periphery of the aluminum foil roll, and its width is less than the width of the aluminum foil roll, so that both ends of the aluminum foil roll are exposed, and its length is greater than the circumference of the aluminum foil roll; the high temperature resistant heat-insulating material is used to insulate the aluminum foil roll, reduce the speed during annealing cooling, and eliminate the annealing heat of the aluminum foil at the same time. Preferably, the high temperature resistant heat-insulating material is one or more of glass fiber, carbon fiber, silicon fiber, aromatic fiber (such as aramid), asbestos fiber with a thermal conductivity of ≤0.034W / (m·K) and a temperature resistance of ≥450℃, and is made of fiber cloth made by weaving or non-woven technology; for example: Jiangyin Weida Aluminum Foil Composite Material Co., Ltd. produces a gram weight of 1050g / m 2 Aluminum foil flame retardant cloth. More preferably, the wrapping width of the high temperature resistant heat insulation material is ≥ 80% but ≤ 98% of the width of the aluminum foil roll.

[0022] The present invention (1) appropriately increases the winding density of the aluminum foil roll while ensuring the degreasing effect, controls it within the range of 2.45 to 2.55 kg / m3, increases the friction between the aluminum foil layers, thereby reducing the axial sliding between the aluminum foil layers and eliminating the end face staggering of the aluminum foil roll; (2) reduces the cooling rate of the annealing and cooling section, fully eliminates the deformation stress difference inside and outside the roll during annealing and cooling, and makes the tension inside and outside the aluminum foil roll uniform; (3) after being taken out of the furnace, the temperature difference between the inside and outside of the aluminum foil roll is ≤6°C, minimizes the shrinkage speed difference when the aluminum foil roll is cooled, and reduces the deformation stress accumulation during the cooling and shrinking process; under the combined effect of the above three points, the control method of the present invention can ensure that annealing blistering and end face staggering are eliminated at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a photo of the surface dislocation of the aluminum foil coil after annealing.

[0024] Figure 2 This is a photo of the middle of the outer circumference of an aluminum foil roll wrapped with high-temperature resistant insulation material. DETAILED DESCRIPTION

[0025] The present invention is further described below by means of specific embodiments, which are only used to illustrate the present invention rather than to limit the present invention.

[0026] Example 1

[0027] A control method for eliminating rear face staggering after aluminum foil annealing, comprising the following steps:

[0028] S1, slitting width 1281mm, coil diameter 662mm, coiling density 2.495kg / m 3 The aluminum foil coils are framed according to the annealing process;

[0029] S2, degreasing and annealing the slit aluminum foil coiling furnace, the annealing temperature drop section is set to 35 hours from 200℃ to 100℃, and the cooling rate is 2.86℃ / h;

[0030] S3, after the annealing process is completed, it takes 49 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; the temperature of the middle part of the end face of the aluminum foil roll, the temperature of the outer ring and the ambient temperature are monitored every 2 hours. At this time, the temperature of the aluminum foil roll is 95℃, and the ambient temperature of the cooling area cover is 60℃, and the difference between the two is 35℃; the cooling rate of the aluminum foil roll is ≤3℃ / h; the maximum temperature difference between the inside and outside of the aluminum foil roll is 2.8℃, and there is no obvious staggered situation on the end face of the aluminum foil;

[0031] S4, when the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is 30°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally, and there is no obvious staggered layer on the end surface of the aluminum foil roll. The aluminum foil surface is degreased and the entire piece is grade A, which is qualified.

[0032] Example 2

[0033] A control method for eliminating rear face staggering after aluminum foil annealing, comprising the following steps:

[0034] S1, slitting width 1455mm, coil diameter 726mm, coiling density 2.49kg / m 3 The aluminum foil coils are framed according to the annealing process;

[0035] S2, using a 1200mm wide and 750mm long aluminum foil flame retardant cloth produced by Jiangyin Weida Aluminum Foil Composite Materials Co., Ltd. to wrap the middle of the outer periphery of the aluminum foil roll, so that the two ends of the aluminum foil roll are exposed about 127.5mm respectively; the high temperature resistant insulation material has an insulation effect on the aluminum foil roll, reducing the speed during annealing cooling;

[0036] S3, degreasing and annealing the slit aluminum foil coiling furnace, the annealing temperature drop section is set to 40 hours from 200 ° C to 100 ° C, and the cooling rate is 2.5 ° C / h;

[0037] S4, after the annealing process is completed, it takes 43 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; the temperature of the middle part of the end face of the aluminum foil roll, the temperature of the outer ring and the ambient temperature are monitored every 2 hours; at this time, the temperature of the aluminum foil roll is 97°C, and the ambient temperature of the cooling area cover is 61°C, and the difference between the two is 36°C, so that the cooling rate of the aluminum foil roll is ≤3°C / h; the maximum temperature difference between the inside and outside of the aluminum foil roll is 3.4°C, and there is no obvious staggered situation on the end face of the aluminum foil;

[0038] S5, when the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is 30°C, the heat preservation cover can be opened to allow the aluminum foil roll to cool naturally, and there is no obvious staggered layer on the end surface of the aluminum foil roll. The aluminum foil surface is degreased and the entire piece is grade A, which is qualified.

[0039] Example 3

[0040] A control method for eliminating rear face staggering after aluminum foil annealing, comprising the following steps:

[0041] S1, slitting width 1625mm, coil diameter 810mm, coiling density 2.52kg / m 3 The aluminum foil coils are framed according to the annealing process;

[0042] S2, produced by Shandong Zhongxu Chemical Fiber Co., Ltd., with a gram weight of 1100g / m 2 The aramid 1313 fiber 3A cloth is wrapped around the middle of the outer periphery of the aluminum foil roll, so that the two ends of the aluminum foil roll are exposed about 62mm respectively; the aluminum foil roll has a heat preservation effect and reduces the speed of annealing cooling;

[0043] S3, degreasing and annealing the slit aluminum foil coiling furnace, the annealing temperature drop section is set to 40 hours from 220℃ to 100℃, and the cooling rate is 3.0℃ / h;

[0044] S4, after the annealing process is completed, it takes 48 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; the temperature of the middle part of the end face of the aluminum foil roll, the temperature of the outer ring and the ambient temperature are monitored every 2 hours; at this time, the temperature of the aluminum foil roll is 96℃, and the ambient temperature of the cooling area cover is 58℃, and the difference between the two is 38℃, so that the cooling rate of the aluminum foil roll is ≤4℃ / h; the maximum temperature difference between the inside and outside of the aluminum foil roll is 3.8℃, and there is no obvious staggered situation on the end face of the aluminum foil;

[0045] S5, when the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is 28°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally, and there is no obvious staggered situation on the end surface of the aluminum foil. The surface of the aluminum foil is degreased and the whole piece is grade A, which is qualified.

[0046] Example 4

[0047] A control method for eliminating rear face staggering after aluminum foil annealing, comprising the following steps:

[0048] S1, slitting width 1350mm, coil diameter 751mm, coiling density 2.51kg / m 3 The aluminum foil coils are framed according to the annealing process;

[0049] S2, degreasing and annealing the slit aluminum foil coils in a coil furnace, with the annealing temperature dropping from 210°C to 100°C in 39 hours, at a cooling rate of 2.82°C / h;

[0050] S3, after the annealing process is completed, it takes 46 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; the temperature of the middle part of the end face of the aluminum foil roll, the temperature of the outer ring and the ambient temperature are monitored every 2 hours; at this time, the temperature of the aluminum foil roll is 98℃, and the ambient temperature of the cooling area cover is 62℃, and the difference between the two is 36℃, so that the cooling rate of the aluminum foil roll is ≤3℃ / h; the maximum temperature difference between the inside and outside of the aluminum foil roll is 2.9℃, and there is no obvious staggered situation on the end face of the aluminum foil;

[0051] S4, when the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is 29°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally, and there is no obvious staggered situation on the end surface of the aluminum foil. The surface of the aluminum foil is degreased and the whole piece is grade A, which is qualified.

[0052] Comparative Example 1

[0053] Comparative Example 1 is a comparative example of Example 2, except that:

[0054] S1, aluminum foil roll winding density is 2.61kg / m 3 ;

[0055] S3, degreasing and annealing the slit aluminum foil coiling furnace, the annealing cooling section is set to 17 hours from 200 ° C to 100 ° C, and the cooling rate is 5.88 ° C / h;

[0056] S4, after the annealing process is completed, it takes 45 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; even if the aluminum foil flame-retardant cloth is wrapped around the outer periphery of the aluminum foil roll, the end face misalignment still occurs at the position where the aluminum foil end face is 31mm away from the outer ring wall thickness due to the too fast annealing cooling rate;

[0057] The temperature of the middle part of the aluminum foil roll end surface, the temperature of the outer ring and the ambient temperature are monitored every 2 hours. At this time, the temperature of the aluminum foil roll is 95°C, and the ambient temperature of the cooling area cover is 57°C. The difference between the two is 38°C, so the cooling rate of the aluminum foil roll is ≤3°C / h. The maximum temperature difference between the inside and outside of the aluminum foil roll is 3.5°C.

[0058] S5, when the temperature difference between the end face of the aluminum foil roll and the atmospheric environment temperature is 30°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally, and the misalignment at the end face of the aluminum foil at a thickness of 31mm from the outer ring wall is not significantly aggravated, and there is no new misalignment at the end face of the aluminum foil. The aluminum foil surface degreasing is 55% grade A, which is unqualified.

[0059] Comparative Example 2

[0060] Comparative Example 2 is a comparative example of Example 4, except that:

[0061] S3, degreasing and annealing the slit aluminum foil coiling furnace, the annealing temperature drop section is set to 25 hours from 210 ° C to 100 ° C, and the cooling rate is 4.4 ° C / h;

[0062] S4, after the annealing process is completed, it takes 48 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and there is a misalignment between the end face of the aluminum foil and the outer ring wall thickness of 18mm and 43mm;

[0063] The temperature of the middle part of the aluminum foil roll end face, the temperature of the outer ring and the ambient temperature were monitored every 2 hours; at this time, the temperature of the aluminum foil roll was 97℃, the ambient temperature of the cooling area was 42℃, the difference between the two was 55℃, the cooling rate of the aluminum foil roll was 3℃ / h, and the temperature difference between the inside and outside of the aluminum foil roll reached a maximum of 6.1℃; the aluminum foil end face had aggravated misalignment at 18mm and 43mm from the outer ring wall thickness, and there were two misalignments at 73mm and 97mm from the aluminum foil end face to the outer ring wall thickness. The aluminum foil surface was degreased and the entire piece was grade A, which was qualified.

[0064] Comparative Example 3

[0065] Comparative Example 2 is a comparative example of Example 4, except that:

[0066] S1, aluminum foil roll winding density is 2.38kg / m 3 ;

[0067] S3, after the annealing process is completed, it takes 39 minutes to get out of the furnace; the aluminum foil roll is hoisted to the annealing cooling area, and the cooling area is covered with a heat preservation cover; but due to the low coiling density, the end face of the aluminum foil is still misaligned at 22mm and 51mm from the outer ring wall thickness.

[0068] The temperature of the middle part of the end face of the aluminum foil roll, the temperature of the outer ring and the ambient temperature are monitored every 2 hours; at this time, the temperature of the aluminum foil roll is 96°C, and the ambient temperature of the cooling area cover is 59°C. The difference between the two is 37°C, so that the cooling rate of the aluminum foil roll is ≤3°C / h; the maximum temperature difference between the inside and outside of the aluminum foil roll is 3.1°C, and the misalignment is aggravated at the locations where the aluminum foil end face is 22mm and 51mm away from the outer ring wall thickness, and there are two misalignments at locations where the aluminum foil end face is 84mm and 117mm away from the outer ring wall thickness.

[0069] S4, when the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is 28°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally. There is no obvious layer dislocation on the end surface of the aluminum foil, and a slight gap appears at the bottom of the aluminum foil roll. The surface of the aluminum foil is degreased and the whole piece is grade A, which is qualified.

Claims

1. A control method for eliminating rear face staggering after aluminum foil annealing, characterized in that: The following steps are involved: S1, slitting the aluminum foil rolls to ensure that the coiling density of the aluminum foil rolls is controlled at 2.45-2.55 kg / m³; S2, degreasing and annealing the slit aluminum foil coiling furnace, the cooling rate of the annealing cooling section should be ≤3℃ / h; S3, taking the aluminum foil roll out of the furnace, placing it in a cooling area, and covering the cooling area with a heat preservation cover, so that the difference between the temperature of the aluminum foil roll and the ambient temperature of the cooling area cover is ≤40°C, and the cooling rate of the aluminum foil roll is ≤4°C / h.

2. The control method for eliminating rear face staggering after aluminum foil annealing according to claim 1 is characterized in that: When the temperature difference between the end surface of the aluminum foil roll and the atmospheric environment temperature is ≤30°C, the heat preservation cover is opened to allow the aluminum foil roll to cool naturally.

3. The control method for eliminating rear face staggering after aluminum foil annealing according to claim 1, characterized in that: The time of taking out of the furnace in step S3 should be controlled within 60 minutes.

4. The control method for eliminating rear face staggering of aluminum foil after annealing according to claim 1, characterized in that: The heat-insulating cover is made of water-absorbent flannel with a gram weight of more than 300 g / m².

5. The control method for eliminating rear face staggering of aluminum foil after annealing according to claim 1, characterized in that: In the step S3, the cooling rate of the aluminum foil roll is set to be ≤3°C / h.

6. The control method for eliminating rear face staggering of aluminum foil after annealing according to claim 1, characterized in that: Before annealing, a high temperature resistant heat-insulating material is used to wrap the middle of the outer periphery of the aluminum foil roll, the width of which is smaller than the width of the aluminum foil material roll, so that both ends of the aluminum foil roll are exposed, and the length of which is greater than the periphery of the aluminum foil roll.

7. The control method for eliminating rear face staggering of aluminum foil after annealing according to claim 6, characterized in that: The high temperature resistant heat insulating material is one or more of glass fiber, carbon fiber, silica fiber, aromatic fiber, asbestos fiber, which has a thermal conductivity of ≤0.034W / (m·K) and a temperature resistance of ≥450°C and is made of fiber cloth through weaving or non-woven processes.

8. The control method for eliminating rear face staggering of aluminum foil after annealing according to claim 6, characterized in that: The wrapping width of the high temperature resistant heat preservation material is ≥ 80% but ≤ 98% of the width of the aluminum foil roll.

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