Aluminum foil cutting method and method for reducing radial chromatic aberration of end face of aluminum foil roll

Abstract

The invention belongs to the technical field of battery foils, and particularly relates to an aluminum foil cutting method and a method for reducing radial chromatic aberration of an aluminum foil roll end face. The method comprises the steps that aluminum foil is conveyed to a cutter groove roller, and a rotating disc cutter cuts the aluminum foil; and lubricating liquid is sprayed to the surface of the disc cutter. The lubricating liquid is sprayed to the surface of the disc cutter when the aluminum foil is cut, lubrication is enhanced, the abrasion degree of the cutting edge is reduced, the abrasion difference between the cutting edge in the later stage and the cutting edge in the early stage is small, and therefore the whole cutting face of the obtained aluminum foil roll is smooth and low in roughness, looks bright after mirror reflection is generated, and no dark area exists.

Description

Technical Field

[0001] The invention belongs to the technical field of battery foil, and in particular relates to an aluminum foil cutting method and a method for reducing radial chromatic aberration of an aluminum foil roll end face. Background Art

[0002] The end surface of the cut aluminum foil roll obtained by unwinding, cutting and rewinding the existing incoming aluminum foil has obvious light and dark color difference. Figure 1 The color of the central area 41 of the end surface (cut surface) of the aluminum foil roll 4 after cutting is light, and the color of the peripheral area 42 of the end surface (cut surface) of the aluminum foil roll 4 after cutting is dark. This seriously affects the aesthetics of the product and is easily mistaken by customers as products from different batches or unstable product quality, affecting product sales.

[0003] In order to solve the above problems, the present invention is proposed. Summary of the invention

[0004] A first aspect of the present invention provides an aluminum foil cutting method, the method comprising conveying an aluminum foil 2 onto a knife groove roller, and cutting the aluminum foil 2 with a rotating disc cutter 1; and spraying a lubricating liquid onto the surface of the disc cutter 1.

[0005] The grooved roller 3 is a roller having a plurality of parallel annular grooves engraved on its circumference, and the aluminum foil 2 wraps a portion of the circumference of the roller at a certain wrap angle. Figure 6 shown.

[0006] Preferably, lubricating liquid is sprayed toward the junction between the disc cutter 1 and the aluminum foil 2 through a first nozzle, and the distance between the first nozzle and the rotation axis of the disc cutter 1 is greater than the radius of the disc cutter 1 .

[0007] like Figure 2 , 4 Point P in Figures 5 and 5 is the position of the first nozzle.

[0008] Preferably, the lubricating liquid is sprayed onto the friction surface 5 on the side of the disc cutter 1 through the second nozzle, wherein the portion of the annular surface of the disc cutter 1 that can contact the aluminum foil 2 during cutting is called the friction surface 5;

[0009] Alternatively, the lubricating liquid is sprayed onto the non-friction surface of the side surface of the disc cutter 1 through a third nozzle.

[0010] More preferably, the second nozzle is located on the side of the disc cutter 1. The number of the second nozzles may be plural.

[0011] More preferably, along the central axial projection of the disc cutter 1, the projection of the second nozzle is located on the friction surface 5 of the disc cutter 1. Figure 2 Q1 and Q2 in Figure 4 and Figure 5 The Q2 point in can be the position of the second nozzle. Figure 4 and Figure 5 The middle arrow indicates the movement direction of the aluminum foil 2.

[0012] Of course, the projection of the second nozzle may not be located on the disc cutter 1, but outside the disc cutter 1. For example, the second nozzle may be located at the oblique side of the disc cutter 1, and in this case, it is sufficient to ensure that the sprayed lubricating liquid is on the friction surface 5 on the side of the disc cutter 1.

[0013] More preferably, the third nozzle is located on the side of the disc cutter 1. There may be a plurality of third nozzles.

[0014] More preferably, along the central axial projection of the disc cutter 1, the projection of the third nozzle is located on the non-friction surface of the disc cutter 1. Figure 2 Point R1 and point R2 in can both be the positions of the third nozzle.

[0015] The friction surface 5 may be the annular blade portion of the disc cutter 1, or include the annular blade portion but be wider than the annular blade portion. Figure 2 The schematic diagram of the cutting process of the aluminum foil 2 of the present application takes a side surface of a disc cutter 1 as an example. Figure 2 The direction of the arrow in the middle is the direction of the object's movement. The outer circle of the groove roller 3 corresponds to the top of the groove. The inner circle (dashed line) of the groove roller 3 corresponds to the bottom of the groove.

[0016] During cutting, the aluminum foil 2 is conveyed by the grooved roller 3, and the blade of the disc cutter 1 is located in the groove of the grooved roller 3, and the blade contacts the aluminum foil 2 to achieve cutting of the aluminum foil 2. M is the starting point of contact between the aluminum foil 2 and the disc cutter 1, and N is the end point of contact between the aluminum foil 2 and the disc cutter 1. The annular surface swept by the side of the disc cutter 1 along the rotating arc MN of the disc cutter 1 is the friction surface 5. The line connecting the axis A of the grooved roller and the axis B of the disc cutter 1 intersects with the grooved roller 1 at C. The circle formed with B as the center and BC as the radius is the non-friction surface of the disc cutter 1. The friction surface 5 is the surface of the disc cutter 1 except for the non-friction surface. The friction surface 5 is annular.

[0017] Preferably, the lubricating fluid comprises one or more of water, lubricating oil, rolling oil or a water-oil mixture.

[0018] Preferably, the water-oil mixture is an oil-in-water emulsion.

[0019] A second aspect of the present application provides a method for reducing radial chromatic aberration of an end face of an aluminum foil roll, wherein the aluminum foil 2 is cut using the method described above, and then the cut aluminum foil 2 is rolled up.

[0020] In the present application, the end surface of the aluminum foil roll 4 specifically refers to the cut surface of the aluminum foil roll 4 obtained by unwinding, cutting, and rewinding the incoming aluminum foil.

[0021] The third aspect of the present invention relates to the use of the aluminum foil cutting method according to the first aspect of the present invention for reducing the radial chromatic aberration of the end surface of an aluminum foil roll.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The predecessors have never studied how to solve the problem of color difference on the end face of aluminum foil rolls. The applicant has also taken many detours when trying to solve it. For example, at first, he thought that the color difference came from the different oxidation degrees of the cut surface, so he spent a lot of time studying the problem of aluminum oxidation, but in vain. After in-depth research, the applicant found that the reason for the color difference between the cut surface of the aluminum foil roll is not the difference in the color itself, but the difference in glossiness. Therefore, strictly speaking, the light-colored area should be called the bright area, and the dark-colored area should be called the dark area. The difference in glossiness comes from the different degrees of wear on the cut surface. The bright area is the cut surface produced by early cutting. Since the early blade wear is low and the blade temperature is not high, the cut surface produced by cutting aluminum foil is smooth and has low roughness. The dark area is the cut surface produced by later cutting. Since the blade wear is high in the later stage and the blade temperature is also high due to long-term friction, the cut surface produced by cutting aluminum foil is rough. The smooth cut surface mainly produces specular reflection, so it looks brighter. The rough cut surface mainly produces diffuse reflection, so it looks darker. Therefore, the cut surface of the aluminum foil roll appears to have color depth difference to the naked eye, which should be strictly called light and dark color difference.

[0024] The present application sprays lubricating liquid onto the surface of the disc cutter 1 when cutting the aluminum foil, thereby increasing lubrication and reducing the degree of blade wear, so that the difference in blade wear between the late and early stages of cutting is not much. Therefore, the entire cut surface of the obtained aluminum foil roll is smooth with low roughness, and appears brighter after mirror reflection without dark areas.

[0025] 2. In one embodiment, the first nozzle is located in front of the blade of the disc cutter 1 (e.g. Figure 2Point P is the position of the first nozzle). At this time, the first nozzle only sprays toward the cutting point in general, without a targeted area. However, as long as some of the lubricating liquid from the first nozzle is sprayed toward the surface of the disc cutter 1, the lubricating liquid on the disc cutter 1 will be thrown onto the friction surface 5 where the disc cutter 1 contacts the aluminum foil under the action of centrifugal force during the rotation of the disc cutter 1. During the cutting process, due to the lubricating effect of the lubricating liquid, the wear of the blade on the friction surface 5 of the disc cutter 1 is reduced, but the disadvantage is that the utilization rate of the lubricating liquid is low. The advantage is that due to the narrow spacing between adjacent annular cutting knives on the disc cutter 1, the first nozzle is set in front of the blade of the disc cutter 1, which is not limited by the narrow spacing mentioned above, and multiple first nozzles can be set side by side at the same time (see Figure 5 The three P points).

[0026] 3. In a preferred embodiment, a second nozzle is provided, which can be provided in the absence of the first nozzle. The second nozzle is located on the side of the disc cutter (1) and sprays lubricating liquid onto the friction surface 5 on the side of the disc cutter 1. Figure 2 Q1 and Q2 in Figure 4 and Figure 5 The Q2 point in the figure can be the position of the second nozzle. At this time, although the position setting of the second nozzle is limited by the narrow spacing between adjacent annular cutting knives on the disc cutter 1, the lubricating liquid sprayed by the second nozzle is very targeted and is completely sprayed onto the friction surface 5 on the side of the disc cutter 1. Similarly to the above, during the cutting process, due to the lubricating effect of the lubricating liquid, the wear of the blade of the disc cutter 1 is reduced. And because the lubricating liquid sprayed by the second nozzle is more concentrated, compared with the lubricating liquid sprayed at point P, the lubricating liquid sprayed at points Q1 and / or Q2 has a higher utilization efficiency, and the effect of reducing the wear of the blade of the disc cutter 1 will be better.

[0027] In addition, since the second nozzle directly sprays the lubricating liquid onto the friction surface 5 of the disc cutter 1, even if the particle size of the sprayed lubricating liquid droplets is very small (at this time, the surface tension between the lubricating liquid droplets and the disc cutter 1 is greater than the centrifugal force on the lubricating liquid droplets, and the lubricating liquid cannot be thrown out by the centrifugal force), it can still play a lubricating effect and effectively reduce the wear of the blade of the disc cutter 1.

[0028] 4. In another alternative embodiment: the lubricating liquid is sprayed onto the non-friction surface of the side of the disc cutter 1 through the third nozzle. The third nozzle can also be independently provided without the first nozzle or the second nozzle.

[0029] First, the lubricating liquid may be water, which is diluted to the friction surface 5 under the action of centrifugal force. The water evaporates after being heated to cool down the friction surface 5 which is heated due to friction during the cutting process.

[0030] Second, the lubricant can also be a water-oil mixture or an oil-in-water emulsion. Water is diluted to the friction surface 5 under the action of centrifugal force. The water evaporates quickly after being heated, which can significantly reduce the temperature of the friction surface 5. At the same time, before a certain section of the annular blade of the disc cutter 1 rotates to the cutting position, if the water phase evaporates completely, the exposed oil phase begins to play a lubricating role. If the water does not evaporate completely, it does not matter. The water and oil play a lubricating role together. Therefore, the friction surface 5 can be cooled and lubricated. The dual effects of cooling and lubrication can further reduce the wear of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the cutting surface of the aluminum foil roll 4 after cutting in the prior art.

[0032] Figure 2 The schematic diagram of the cutting process of the aluminum foil 2 of the present application takes a disc cutter 1 as an example.

[0033] Figure 3 This is a cross-sectional view of the cutting process of the aluminum foil 2 of the present application, taking three disc cutters 1 as an example.

[0034] Figure 4 A top view of the partial structure of a disc cutter 1 for cutting aluminum foil in the present application.

[0035] Figure 5 This is a top view of the partial structure of three disc cutters 1 cutting aluminum foil in this application.

[0036] Figure 6 This is a schematic diagram of the structure of the knife groove roller 3 of this application.

[0037] List of reference numerals:

[0038] 1. Disc cutter, 11. Disc cutter blade, 12. Disc cutter body, 2. Aluminum foil, 3. Slotted roller, 4. Aluminum foil roll, 41. Central area, 42. Peripheral area, 5. Friction surface, A. Center of the side of the slotted roller, A-A', axis of the slotted roller, B. Center of the side of the disc cutter, B-B', axis of the disc cutter. DETAILED DESCRIPTION

[0039] The present invention is described below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto. The experimental methods for which specific conditions are not specified in the examples are generally carried out according to conventional conditions and conditions described in the manual, or according to the conditions recommended by the manufacturer. The general equipment, materials, reagents, etc. used can be obtained from commercial channels unless otherwise specified. The raw materials required in the following examples and comparative examples are all commercially available.

[0040] The rolling oil was purchased from Jiangsu Yingji Lubrication Technology Co., Ltd., and its name was stamping and stretching oil E-C20.

[0041] The automotive lubricant was purchased from Beijing Zhongrun Huayou Petrochemical Co., Ltd., model GL-5 85W-140.

[0042] Example 1

[0043] A method for reducing the color difference of the cut surface of an aluminum foil roll, wherein the aluminum foil (2) is cut using the following method, and the method comprises the following steps:

[0044] The aluminum foil is conveyed onto the knife groove roller, and the rotating disc cutter 1 cuts the aluminum foil 2;

[0045] At the same time, a lubricating liquid spraying mechanism is used to spray lubricating liquid toward the junction of the disc cutter 1 and the aluminum foil 2 through a first nozzle thereon, and the distance between the first nozzle and the rotating axis of the disc cutter 1 is greater than the radius of the disc cutter 1;

[0046] The cut aluminum foil 2 is rolled up to obtain an aluminum foil roll 4 .

[0047] The number of the disc cutter 1 is one, and it is used to cut the aluminum foil 2 into two.

[0048] The width of the aluminum foil 2 is 1200 mm. The width of each aluminum foil after cutting is 600 mm.

[0049] The minimum distance between the first nozzle and the edge of the disc cutter 1 is 30 mm. Figure 2 and 4 As shown, the position of the first nozzle is at P. The output pressure of the first nozzle is 0.11 MPa. The number of the first nozzle is one.

[0050] The lubricating liquid component sprayed by the first nozzle is rolling oil.

[0051] Example 2

[0052] A method for reducing the color difference of the cut surface of an aluminum foil roll, wherein the aluminum foil is cut using the following method, and the method comprises the following steps:

[0053] The aluminum foil is conveyed onto the knife groove roller, and the rotating disc cutter 1 cuts the aluminum foil 2;

[0054] At the same time, a lubricating liquid spraying mechanism is used to spray lubricating liquid onto the friction surface 5 on the side of the disc cutter 1 through a second nozzle thereon, wherein the portion of the annular surface of the disc cutter 1 that can contact the aluminum foil 2 during cutting is called the friction surface 5.

[0055] Projected along the central axial direction of the disc cutter 1 : the projection of the second nozzle is located on the friction surface 5 of the disc cutter 1 .

[0056] In this embodiment 2, the position of the second nozzle is Figure 2Q2. The number of the second nozzles is 2. The distance between the second nozzle and the side of the disc cutter 1 is 20 mm. The output pressure of the second nozzle is 0.11 MPa. The number of the disc cutter 1 is one, which is used to cut the aluminum foil 2 into two. The width of the aluminum foil 2 is 1200 mm. The width of each aluminum foil after cutting is 600 mm. The lubricating liquid component is also rolling oil.

[0057] Example 3

[0058] A method for reducing the color difference of the cut surface of an aluminum foil roll, wherein the aluminum foil is cut using the following method, and the method comprises the following steps:

[0059] The aluminum foil is conveyed onto the knife groove roller, and the rotating disc cutter 1 cuts the aluminum foil 2;

[0060] At the same time, a lubricating liquid spraying mechanism is used to spray lubricating liquid onto the friction surface 5 on the side of the disc cutter 1 through a second nozzle thereon, wherein the portion of the annular surface of the disc cutter 1 that can contact the aluminum foil 2 during cutting is called the friction surface 5.

[0061] Projected along the central axial direction of the disc cutter 1 : the projection of the second nozzle is located on the friction surface 5 of the disc cutter 1 .

[0062] In this embodiment 3, the position of the second nozzle is Figure 2 Q1. The number of the second nozzles is 2. The distance between the second nozzle and the side of the disc cutter 1 is 20 mm. The output pressure of the second nozzle is 0.11 MPa. The number of the disc cutter 1 is one, which is used to cut the aluminum foil 2 into two. The width of the aluminum foil 2 is 1200 mm. The width of each aluminum foil after cutting is 600 mm. The lubricating liquid is also rolling oil.

[0063] Example 4

[0064] A method for reducing the color difference of the cut surface of an aluminum foil roll, wherein the aluminum foil is cut using the following method, and the method comprises the following steps:

[0065] The aluminum foil is conveyed onto the knife groove roller, and the rotating disc cutter 1 cuts the aluminum foil 2;

[0066] At the same time, the lubricating liquid spraying mechanism is used to spray the lubricating liquid onto the non-friction surface of the side of the disc cutter 1 through the third nozzle thereon;

[0067] The portion of the annular surface of the disc cutter 1 that can contact the aluminum foil 2 during cutting is called the friction surface.

[0068] Projected along the central axial direction of the disc cutter 1 : the projection of the third nozzle is located on the non-friction surface of the disc cutter 1 .

[0069] In this embodiment 4, the position of the third nozzle is Figure 2 The number of the third nozzles is 2. The distance between the third nozzle and the side of the disc cutter 1 is 20 mm. The output pressure of the third nozzle is 0.105 MPa. Since the output pressure is relatively low, the droplets are relatively large, which are sufficient to be thrown onto the friction surface under the action of centrifugal force. The lubricating liquid is composed of water. The number of the disc cutter 1 is one, which is used to cut the aluminum foil 2 into two. The width of the aluminum foil 2 is 1200 mm. The width of each aluminum foil after cutting is 600 mm.

[0070] Example 5

[0071] A method for reducing the color difference of the cut surface of an aluminum foil roll, wherein the aluminum foil is cut using the following method, the method comprising the following steps:

[0072] The aluminum foil is conveyed onto the knife groove roller, and the rotating disc cutter 1 cuts the aluminum foil;

[0073] At the same time, the lubricating liquid spraying mechanism is used to spray the lubricating liquid onto the non-friction surface of the side of the disc cutter 1 through the third nozzle thereon;

[0074] The portion of the annular surface of the disc cutter 1 that can contact the aluminum foil during cutting is called the friction surface 5.

[0075] Projected along the central axial direction of the disc cutter 1 : the projection of the third nozzle is located on the non-friction surface of the disc cutter 1 .

[0076] In this embodiment 5, the position of the third nozzle is Figure 2 The number of the third nozzles is 2. The distance between the third nozzle and the side of the disc cutter 1 is 20 mm. The output pressure of the third nozzle is 0.105 MPa. Since the output pressure is relatively low, the droplets are relatively large, which are sufficient to be thrown to the friction surface under the action of centrifugal force. The lubricating liquid is composed of water. The number of the disc cutter 1 is one, which is used to cut the aluminum foil into two. The width of the aluminum foil is 1200 mm. After cutting, the width of each aluminum foil is 600 mm.

[0077] Example 6

[0078] Only the lubricating liquid sprayed by the third nozzle of Example 5 is replaced by a water-oil mixture. The water-oil mixture is prepared as follows: automotive lubricating oil and water are mixed in a mass ratio of 1:10 and stirred vigorously to emulsify to obtain an oil-in-water emulsion, and then sprayed to obtain oil-in-water droplets.

[0079] Comparative Example 1

[0080] Compared with Example 1, no lubricating liquid spraying mechanism is provided, and lubricating liquid is not sprayed onto the interface between the disc cutter 1 and the aluminum foil, and other operations are the same.

[0081] Results test:

[0082] The glossiness of the end surface (ie, the cut surface) of the aluminum foil roll 4 obtained after cutting in the above-mentioned embodiment and comparative example was tested.

[0083] The method is as follows: The CS-300S microporous gloss meter of Hangzhou Caipu Technology Co., Ltd. is used to measure the glossiness of the 60-degree cut surface of the obtained aluminum foil roll 4. Each test sample is measured at 5 locations in the central area of ​​its cut surface, and the average value of the measurement results is taken as the gloss result value of the central area. Each test sample is measured at 5 locations in the peripheral area of ​​its cut surface, and the average value of the measurement results is taken as the gloss result value of the central area. The radius of the cut surface is R, and the circle is O. The central area of ​​the cut surface is the inner circle with O as the center and 0.5R as the radius. The peripheral area of ​​the cut surface is the annular part of the cut surface after removing this inner circle.

[0084] The results are shown in Table 1.

[0085] Table 1 proves that:

[0086] 1. Compared with the comparative example 1, in which the glossiness of the central area is relatively high and the glossiness of the peripheral area is very low, the glossiness of the central area and the peripheral area of ​​Examples 1-6 are both high (above 450 GU) and the difference is not large (the glossiness difference between the central area and the peripheral area is less than 50 GU). This shows that spraying lubricating liquid on the disc cutter 1 can reduce the radial color difference of the end surface of the aluminum foil roll 4 and improve the glossiness of the end surface.

[0087] 2. The glossiness of the central area and the peripheral area of ​​Examples 2 and 3 are greater than that of Example 1. The glossiness difference between the central area and the peripheral area of ​​Examples 2 and 3 is also less than that of Example 1. This shows that, compared with spraying lubricating liquid on the junction of the disc cutter 1 and the aluminum foil, spraying lubricating oil on the friction surface 5 of the disc cutter 1 can further improve the glossiness of the cut surface of the aluminum foil roll 4 and reduce the radial color difference of the end face.

[0088] 3. The glossiness of the central area and the peripheral area of ​​Examples 4 and 5 are greater than that of Example 1. The difference in glossiness between the central area and the peripheral area of ​​Examples 4 and 5 is also less than that of Example 1. This shows that, compared with spraying lubricating liquid at the junction of the disc cutter 1 and the aluminum foil, spraying water on the non-friction surface of the disc cutter 1 to cool the disc cutter 1 can further improve the glossiness of the cut surface of the aluminum foil roll 4 and reduce the radial color difference of the end face.

[0089] 4. The glossiness of the central area and the peripheral area of ​​Example 6 are greater than that of Example 5. The difference in glossiness between the central area and the peripheral area of ​​Example 6 is also less than that of Example 5. This shows that replacing the lubricating liquid sprayed on the non-friction surface of the disc cutter 1 with a water-oil mixture from water can further increase the cooling and lubricating effects on the disc cutter, further improve the glossiness of the cut surface of the aluminum foil roll 4, and reduce the radial color difference of the end face.

[0090] Table 1

[0091]

[0092]

Claims

1. A method for cutting aluminum foil, comprising conveying an aluminum foil (2) onto a grooved roller, and cutting the aluminum foil (2) with a rotating disc cutter (1); characterized in that: Lubricating liquid is sprayed onto the surface of the disc cutter (1).

2. The method according to claim 1, characterized in that: Lubricating liquid is sprayed toward the junction of the disc cutter (1) and the aluminum foil (2) through a first nozzle, and the distance between the first nozzle and the rotation axis of the disc cutter (1) is greater than the radius of the disc cutter (1).

3. The method according to claim 2, characterized in that Spraying lubricating liquid onto the friction surface (5) on the side of the disc cutter (1) through the second nozzle, wherein the portion of the annular surface of the disc cutter (1) that can contact the aluminum foil (2) during cutting is called the friction surface (5); Alternatively, lubricating liquid is sprayed onto the non-friction surface of the side of the disc cutter (1) through a third nozzle.

4. The method according to claim 1, characterized in that The lubricating fluid comprises one or more of water, lubricating oil, rolling oil or a water-oil mixture.

5. The method according to claim 4, characterized in that The water-oil mixture is an oil-in-water emulsion.

6. A method for reducing radial chromatic aberration of an aluminum foil roll end surface, characterized in that: After the aluminum foil (2) is cut using the method described in claim 1, the cut aluminum foil (2) is rolled up.

7. Use of the aluminum foil cutting method according to claim 1 for reducing radial chromatic aberration of the end surface of an aluminum foil roll.

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