Foil rolling oil removal device and rolling oil removal method
By using an extraction and drying process in a foil rolling degreasing device, the problem of residual rolling oil on the foil surface is solved, achieving efficient degreasing, ensuring a clean foil surface, and improving coating quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
- Filing Date
- 2022-12-06
- Publication Date
- 2026-07-21
AI Technical Summary
In the traditional foil rolling process, residual rolling oil leads to reduced surface polarity and uneven dyne values, affecting subsequent coating applications. Incomplete degreasing also results in defects such as missed coating and weakened peel strength.
The foil rolling degreasing device, consisting of an extraction tank and a dryer, removes rolling oil through extraction with an extractant and drying treatment. The liquid seal structure reduces the impact of extractant volatilization and condensation, achieving continuous and efficient degreasing.
The residual oil content on the foil surface is reduced to below 0.1%, ensuring the cleanliness of the foil surface, preventing condensation from affecting performance, and improving subsequent use.
Smart Images
Figure CN115921554B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of foil preparation technology, and in particular to a foil rolling degreasing device and a rolling degreasing method. Background Technology
[0002] The traditional aluminum foil manufacturing process involves multiple rolling and thinning steps, during which rolling oil is indispensable. The main functions of rolling oil are lubrication, cooling, cleaning, and preventing oxidation. However, the use of rolling oil leads to the following problems with the foil: 1. Residual rolling oil on the surface of the produced foil causes reduced surface polarity and uneven dyne values; 2. Coating defects such as missed coatings and poor peel strength occur. Currently, active materials and other conductive materials are mainly coated onto the battery foil using coating technology. Residual rolling oil on the surface can cause problems such as missed coatings and weakened peel strength; 3. The surface wetting tension of the foil is directly related to the amount of oil on the foil surface. Completely degreased aluminum foil has a surface tension of over 72 dynes, rough-rolled aluminum foil has a surface tension of around 31 dynes, and fine-rolled aluminum foil has a surface tension of around 32 dynes. If degreasing is incomplete, defects such as oil stickiness, blistering, streaks, and oil spots will appear on the foil product. These problems seriously affect the subsequent coating and use of the battery foil.
[0003] Traditional degreasing methods primarily involve high-temperature steam purging. However, even after purging, the surface oil residue rate remains at 4%, indicating a high rolling oil content that still affects subsequent use. This method suffers from incomplete degreasing and inefficiency. Therefore, developing an efficient degreasing device for foil rolling has become a pressing technical problem that needs to be solved. Summary of the Invention
[0004] Therefore, it is necessary to provide a foil rolling degreasing device that uses extraction to degrease the foil and seals the extraction tank with a liquid seal structure to reduce the volatilization of the extractant and reduce the impact of condensation on the surface properties of the foil.
[0005] The specific solution to the above-mentioned technical problems in this application is as follows:
[0006] In a first aspect, this application provides a foil rolling degreasing apparatus, comprising a foil rolling mill, an extraction tank, and a dryer arranged sequentially along the foil movement direction. The extraction tank is used to inject an extractant, and a liquid seal structure is provided at the opening of the extraction tank. The foil rolling mill is used to roll the foil, and the dryer is used to dry the foil. The foil rolling degreasing apparatus further includes a foil conveyor, which is used to convey the foil from the foil rolling mill and the extraction tank to the dryer.
[0007] As a preferred technical solution of this application, the extraction tank is provided with multiple overflow plates, the height of the overflow plates increases sequentially along the movement direction of the foil, and the overflow plates divide the extraction tank to form multiple extraction chambers.
[0008] Optionally, the extraction tank is provided with an extractant outlet on the foil input side and an extractant inlet on the foil output side. The extractant enters through the extractant inlet, flows sequentially through each extraction chamber, and is discharged through the extractant outlet.
[0009] As a preferred technical solution of this application, at least one circulating cooler is provided in the extraction tank.
[0010] Optionally, each of the extraction chambers is provided with a circulating cooler, which is used to regulate the temperature of the extractant in the extraction chamber.
[0011] Optionally, each of the extraction chambers is independently provided with a drain port, and the drain ports are all located at the bottom of the extraction tank.
[0012] As a preferred technical solution of this application, the liquid seal structure includes a sealing plate covering the opening of the extraction tank, the sealing plate is provided with at least one vent, and each vent is provided with a liquid storage tank surrounding the vent and a sealing cap, the edge of the sealing cap being immersed below the liquid surface of the liquid storage tank.
[0013] As a preferred technical solution of this application, a positive pressure gas source is connected above the liquid surface in the extraction tank, and the positive pressure gas source is used to maintain the gas pressure in the extraction tank greater than the ambient gas pressure.
[0014] As a preferred technical solution of this application, the dryer includes a shell and a plurality of air nozzles disposed within the shell, the air nozzles being arranged sequentially along the movement direction of the foil.
[0015] As a preferred technical solution of this application, the foil conveyor includes an unwinding mechanism, a winding mechanism, a tensioning mechanism, and multiple conveying rollers.
[0016] The unwinding mechanism is located on the feed side of the foil rolling mill, and the winding mechanism is located on the discharge side of the dryer.
[0017] As a preferred embodiment of this application, the tension mechanism includes at least one tension roller, which is used to provide foil tension.
[0018] The tension rollers include a first tension roller, a second tension roller, and a third tension roller. The first tension roller is disposed between the unwinding mechanism and the foil rolling mill, the second tension roller is disposed between the foil rolling mill and the extraction tank, and the third tension roller is disposed between the extraction tank and the dryer.
[0019] Secondly, this application provides a method for degreasing foil by rolling, wherein the method employs the foil rolling degreasing apparatus as described in the first aspect, and the method includes the following steps:
[0020] After rolling, the foil is subjected to extraction and drying processes to remove the rolling oil from the surface of the foil.
[0021] As a preferred technical solution of this application, the extraction process adopts countercurrent contact extraction, and the movement direction of the foil is opposite to the flow direction of the extractant.
[0022] Optionally, the extractant is cooled during the extraction process.
[0023] Optionally, the drying temperature is 60 to 100°C, for example, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C or 100°C.
[0024] Optionally, a protective atmosphere is used during the extraction process.
[0025] Optionally, the pressure of the protective atmosphere is greater than the ambient gas pressure.
[0026] Optionally, the protective atmosphere may include nitrogen.
[0027] Optionally, the extractant used in the extraction process includes dichloromethane.
[0028] This application has the following beneficial effects:
[0029] This application involves extracting and drying rolled foil to achieve continuous and efficient removal of rolling oil from the foil surface. After rolling, the foil temperature rises, and it enters the extraction tank to contact the extractant, effectively removing the surface rolling oil. Furthermore, the liquid-sealed structure reduces the volatilization of the extractant and the generation of condensate, preventing condensate from dripping onto the foil surface and affecting its surface properties. The oil content can be reduced to below 0.1%. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of a foil rolling degreasing apparatus provided in one embodiment of this application.
[0031] Figure 2 This is a schematic diagram of the extraction tank provided in a specific embodiment of this application.
[0032] Figure 3 This is a schematic diagram of a liquid seal structure provided in one specific embodiment of this application.
[0033] Among them, 1-foil rolling mill; 2-extraction tank; 3-dryer; 4-liquid seal structure; 5-overflow plate; 6-air nozzle; 7-unwinding mechanism; 8-rewinding mechanism; 9-transfer roller; 10-first tension roller; 11-second tension roller; 12-third tension roller; 13-circulating cooler; 14-extractant outlet; 15-exhaust port; 16-liquid storage tank; 17-sealing cap. Detailed Implementation
[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0037] In one specific embodiment, this application provides a foil rolling degreasing apparatus, such as... Figure 1 As shown, the device includes a foil rolling mill 1, an extraction tank 2, and a dryer 3 arranged sequentially along the foil movement direction. The extraction tank 2 is used to inject an extractant, and a liquid seal structure 4 is provided at the opening of the extraction tank 2. The foil rolling mill 1 is used to roll the foil, and the dryer 3 is used to dry the foil. The foil rolling degreasing device also includes a foil conveyor, which is used to convey the foil from the foil rolling mill and the extraction tank to the dryer.
[0038] In this application, an extraction tank 2 and a dryer 3 are used to extract and dry the rolled foil, respectively. During the extraction process, the foil is immersed in the extractant to remove the surface rolling oil. After extraction, the foil enters the dryer 3 to evaporate and remove the residual extractant on the surface, thereby effectively ensuring the cleanliness of the foil surface and reducing the surface oil residual rate of the foil to below 0.1%, thus achieving continuous and efficient removal of rolling oil from the foil surface.
[0039] Optionally, the foil moves in a serpentine reciprocating motion within the extraction tank 2, thereby increasing the contact time between the foil and the extractant and effectively removing the rolling oil from the surface of the foil.
[0040] Optionally, the foil rolling mill 1 includes a work roll, a support roll, and multiple oil nozzles. The support roll is fixedly arranged, while the work roll is movable. The thickness of the rolled foil is controlled by the distance between the support roll and the work roll. The oil nozzles are used to spray rolling oil onto the foil entering between the work roll and the support roll. The foil sprayed with rolling oil then enters the rolling zone between the work roll and the support roll for rolling. In this application, rolling oil is added to the foil rolling mill during the rolling process to lubricate and cool the foil. The thickness of the rolled foil is 13–15 μm, for example, it can be 13.0 μm, 13.2 μm, 13.4 μm, 13.6 μm, 13.8 μm, 14.0 μm, 14.2 μm, 14.4 μm, 14.6 μm, 14.8 μm, or 15.0 μm.
[0041] In one embodiment of this application, such as Figure 1 and Figure 2 As shown, the extraction tank is equipped with multiple overflow plates 5, the height of which increases sequentially along the movement direction of the foil. The overflow plates 5 divide the extraction tank 2 to form multiple extraction chambers. In this application, multiple overflow plates 5 are provided in the extraction tank 2, and by varying the height of the overflow plates 5, the overflow direction of the extractant is made opposite to the movement direction of the foil, thereby achieving multi-stage countercurrent extraction of the foil and improving the contact effect between the foil surface and the extractant.
[0042] Optionally, on the foil input side of the extraction tank 2, the extraction tank 2 is provided with an extractant outlet 14, and on the foil output side of the extraction tank 2, the extraction tank 2 is provided with an extractant inlet. The extractant enters through the extractant inlet, flows sequentially through each extraction chamber, and is discharged through the extractant outlet 14. In this application, by adding extractant, the extractant concentration in each extraction chamber is maintained, and overflow flow is provided. After extraction, the rolling oil floats on the surface of the extractant liquid, thereby allowing the liquid layer containing the rolling oil on the surface to be discharged through overflow, effectively ensuring the extraction effect of the extraction tank. Furthermore, in this application, a concentration detector can also be added to the extraction tank 2 to detect the concentration of the rolling oil or the extractant in the extraction tank, thereby adjusting the liquid inlet rate of the extractant based on the concentration detection in the extraction tank, and ensuring the stability of the extractant concentration in the extraction tank in real time.
[0043] Optionally, the mixture of rolling oil and extractant discharged from the extractant outlet 14 is connected to a separation device, such as a fractionator, to separate the rolling oil and extractant by fractionation, thereby realizing the recycling of the rolling oil and extractant.
[0044] In one embodiment of this application, at least one circulating cooler 1 is provided in each of the extraction tanks 2. Optionally, a circulating cooler 13 is provided in each of the extraction chambers. The circulating cooler 13 is used to regulate the temperature of the extractant in the extraction chamber. Specifically, the circulating cooler 13 includes a circulation pipeline connected to the extraction chamber. The circulation pipeline is equipped with a circulation pump and a cooler. The circulation pump drives the extractant in the extraction chamber to circulate, realizing the internal circulation of the extractant and ensuring the uniformity of the extractant in the extraction chamber. Furthermore, the extractant comes into contact with the cooler during the circulation process, reducing the temperature of the extractant, reducing extractant evaporation and water vapor evaporation, thereby reducing water vapor condensation. Optionally, the cooler can be a heat pipe heat exchanger.
[0045] Optionally, each extraction chamber is independently equipped with a drain port, which is located at the bottom of the extraction tank. Optionally, all drain ports converge into a main drain pipe. This application achieves rapid drainage during the cleaning process by providing a drain port in each extraction chamber.
[0046] In one embodiment of this application, such as Figure 3As shown, the liquid seal structure includes a sealing plate covering the opening of the extraction tank. The sealing plate has at least one vent 15, and each vent 15 is surrounded by a liquid storage tank 16 and a sealing cap 17. The edge of the sealing cap 17 is immersed below the liquid surface of the liquid storage tank 16. Specifically, the sealing cap 17 is fixed to the wall of the sealing plate or the liquid storage tank 16 by means of a bracket. After the sealing cap 17 extends into the liquid storage tank 16, it forms a U-shaped groove structure. After liquid is added into the liquid storage tank 16, a liquid seal layer is formed, achieving a sealing effect, that is, the liquid seal layer and the side wall of the sealing cap isolate and seal the area.
[0047] In one embodiment of this application, a positive pressure gas source (not shown in the figure) is connected above the liquid surface in the extraction tank 2. The positive pressure gas source is used to maintain the gas pressure in the extraction tank 2 higher than the ambient gas pressure. For example, the positive pressure gas source is nitrogen. In this application, by introducing gas into the extraction tank 2, a slightly positive pressure state is formed inside the extraction tank 2, which effectively prevents water vapor in the ambient gas from entering the extraction tank 2, reduces water vapor condensation, and reduces the volatilization of the extractant through the slightly positive pressure.
[0048] In one embodiment of this application, the dryer 3 includes a housing and a plurality of air nozzles 6 disposed within the housing, the air nozzles 6 being arranged sequentially along the movement direction of the foil.
[0049] In one embodiment of this application, the foil conveyor includes an unwinding mechanism 7, a winding mechanism 8, a tension mechanism, and a plurality of conveying rollers 9; the unwinding mechanism 7 is disposed on the feed side of the foil rolling mill 1, and the winding mechanism 8 is disposed on the discharge side of the dryer 3. Further, the tension mechanism includes at least one tension roller for providing foil tension; specifically, the tension roller includes a first tension roller 10, a second tension roller 11, and a third tension roller 12. The first tension roller 10 is disposed between the unwinding mechanism 7 and the foil rolling mill 1, the second tension roller 11 is disposed between the foil rolling mill 1 and the extraction tank 2, and the third tension roller 12 is disposed between the extraction tank 2 and the dryer 3. Optionally, the unwinding mechanism 7 may be an air-expanding shaft, and the unwinding speed is 10–150 m / min.
[0050] Optionally, the foil rolling degreasing device further includes a tension detector and a tension regulator. The tension detector detects the tension of each tension roller, and the tension regulator adjusts the position of the tension roller to increase the tension of the foil and prevent wrinkling. Furthermore, by setting three tension rollers in this application, four tension control sections are formed, enabling precise control during foil transport. For example, the tension of the tension roller can be detected by measuring the surface pressure of the tension roller. The tension regulator can consist of a PLC controller and a driver; the driver is connected to the tension roller to move its position, and the PLC controller is independently electrically connected to both the driver and the tension detector, thereby automatically adjusting the foil tension in real time.
[0051] In another specific embodiment, this application provides a rolling degreasing method for foil, wherein the rolling degreasing method employs the aforementioned foil rolling degreasing apparatus, and the rolling degreasing method includes:
[0052] After rolling, the foil is subjected to extraction and drying processes to remove the rolling oil from the surface of the foil.
[0053] This application involves sequentially extracting and drying the foil after rolling. The rolling oil on the foil surface is removed by extraction, and the residual extractant on the foil surface is further removed by drying.
[0054] In one embodiment of this application, countercurrent contact extraction is employed during the extraction process, and the movement direction of the foil is opposite to the flow direction of the extractant. This application improves the contact effect between the foil and the extractant by using countercurrent contact, thereby enhancing the removal of rolling oil.
[0055] In one embodiment of this application, the extractant is cooled during the extraction process. This application reduces the heat generated during foil rolling that causes the extraction temperature to rise, thereby preventing the extractant and water vapor from evaporating due to heat and reducing extractant waste.
[0056] In one embodiment of this application, the drying temperature is 60–100°C.
[0057] In one embodiment of this application, a protective atmosphere is used during the extraction process. Furthermore, the pressure of the protective atmosphere is greater than the ambient gas pressure, and the protective atmosphere gas includes nitrogen.
[0058] In one embodiment of this application, the extraction process includes dichloromethane. This application uses dichloromethane as an extractant, which has high solubility for rolling oil, effectively removing rolling oil from the surface and pores of the foil. Furthermore, dichloromethane has a low boiling point, making it easy to dry and remove, thus not affecting the surface properties of the foil. In addition, dichloromethane and rolling oil can be separated by fractional distillation, enabling the recycling of both.
[0059] Exemplarily, a rolling degreasing method for the above-mentioned foil material is provided, the rolling degreasing method specifically including the following steps:
[0060] After being rolled, the foil enters the extraction tank and undergoes multi-stage extraction through multiple extraction chambers. The flow direction of the extractant is opposite to the movement direction of the foil. The extractant flows by overflow. After extraction, the foil enters the dryer to dry and remove the extractant residue on the foil surface. The mixed liquid flowing out of the extraction tank is recycled.
[0061] In the following examples, the thickness of the foil after rolling is 13μm, the rolling oil used is CL-1# aluminum foil rolling oil, the length of the foil immersed in the extractant is 20m, the type of foil is aluminum foil, and the unwinding speed is 50m / min.
[0062] Example 1
[0063] This embodiment provides a foil rolling degreasing device, including a foil rolling mill, an extraction tank and a dryer arranged sequentially along the foil movement direction. The opening of the extraction tank is provided with a liquid seal structure, the extraction agent of the extraction tank is dichloromethane, and the drying temperature of the dryer is 80°C.
[0064] The liquid seal structure includes a sealing plate covering the opening of the extraction tank. The sealing plate has two vents, and each vent is provided with a liquid storage tank surrounding the vent and a sealing cap. The edge of the sealing cap is immersed below the liquid surface of the liquid storage tank.
[0065] The foil rolling degreasing device also includes a foil conveyor, which is used to convey foil, and the foil moves in a serpentine reciprocating motion in the extraction tank.
[0066] The foil conveyor includes an unwinding mechanism, a winding mechanism, a tensioning mechanism, and multiple conveying rollers. The unwinding mechanism is located on the feed side of the foil rolling mill, and the winding mechanism is located on the discharge side of the dryer. Further, the tension rollers include a first tension roller, a second tension roller, and a third tension roller. The first tension roller is located between the unwinding mechanism and the foil rolling mill, the second tension roller is located between the foil rolling mill and the extraction tank, and the third tension roller is located between the extraction tank and the dryer.
[0067] Example 2
[0068] This embodiment provides a foil rolling degreasing device. Compared with Embodiment 1, the difference is that the extraction tank is provided with three overflow plates. The height of the overflow plates increases sequentially along the movement direction of the foil. The overflow plates divide the extraction tank to form four extraction chambers.
[0069] Located on the foil input side of the extraction tank, the extraction tank is provided with an extractant outlet. Located on the foil output side of the extraction tank, the extraction tank is provided with an extractant inlet. The extractant enters through the extractant inlet, flows sequentially through each extraction chamber, and is discharged through the extractant outlet.
[0070] Example 3
[0071] This embodiment provides a foil rolling degreasing device. Compared with Embodiment 2, the difference is that the extraction chamber is equipped with a circulating cooler. The circulating cooler includes a circulating pipeline that is circulatedly connected to the extraction chamber. The circulating pipeline is equipped with a circulating pump and a cooler. The temperature of the cooler is 25°C.
[0072] Example 4
[0073] This embodiment provides a foil rolling degreasing device. Compared with Embodiment 1, the difference is that a positive pressure gas source is connected above the liquid surface in the extraction tank. The positive pressure gas source is nitrogen, and the gas pressure in the extraction tank is 200 Pa greater than the ambient gas pressure.
[0074] Example 5
[0075] This embodiment provides a foil rolling degreasing device, including a foil rolling mill, an extraction tank and a dryer arranged sequentially along the foil movement direction, wherein the extraction tank is filled with dichloromethane.
[0076] The extraction tank is provided with a liquid seal structure at its opening. The liquid seal structure includes a sealing plate covering the opening of the extraction tank. The sealing plate is provided with two vents. Each vent is provided with a liquid storage tank surrounding the vent and a sealing cap. The edge of the sealing cap is immersed below the liquid surface of the liquid storage tank.
[0077] The extraction tank is equipped with three overflow plates, the height of which increases sequentially along the movement direction of the foil. The overflow plates divide the extraction tank into four extraction chambers located on the foil input side of the extraction tank. The extraction tank is equipped with an extractant outlet located on the foil output side of the extraction tank. The extraction tank is also equipped with an extractant inlet, through which the extractant enters and flows sequentially through each extraction chamber, and is discharged through the extractant outlet. Each extraction chamber is equipped with a circulating cooler with a temperature of 25°C. Each extraction chamber is also independently equipped with a drain outlet located at the bottom of the extraction tank.
[0078] A positive pressure gas source is connected above the liquid surface in the extraction tank. The positive pressure gas source is used to maintain the gas pressure in the extraction tank at a pressure greater than the ambient gas pressure by 200 Pa. The dryer includes a shell and 20 air nozzles disposed within the shell. The air nozzles are arranged sequentially along the movement direction of the foil. The temperature of the dryer is 80°C.
[0079] The foil rolling degreasing device further includes a foil conveyor, which comprises an unwinding mechanism, a winding mechanism, a tension mechanism, and multiple conveying rollers. The unwinding mechanism is located on the feed side of the foil rolling mill, and the winding mechanism is located on the discharge side of the dryer. Further, the tension rollers include a first tension roller, a second tension roller, and a third tension roller. The first tension roller is located between the unwinding mechanism and the foil rolling mill, the second tension roller is located between the foil rolling mill and the extraction tank, and the third tension roller is located between the extraction tank and the dryer.
[0080] Comparative Example 1
[0081] This comparative example provides a foil rolling degreasing device. Compared with Example 1, the difference is that the extraction tank and dryer are replaced with a high-temperature steam purging device, the length of the foil being purged is 1m, and the temperature of the high-temperature steam is 110°C.
[0082] The residual oil content on the surface of the foils after degreasing in the above embodiments and comparative examples was tested, and the test results are shown in Table 1. The testing method includes:
[0083] S1. Prepare the sample by cutting foil into unit areas using a cutting knife. The size of the foil after cutting should be such that it is easy to extract. Weigh and record the mass as m0.
[0084] S2, Cleaning and degreasing: Unfold the sample cut in S1 and place it in a beaker containing dichloromethane;
[0085] S3. Ultrasonic oscillation: Place the beaker from S2 into the ultrasonic cleaning tank and use ultrasonic oscillation to dissolve the rolling oil into dichloromethane.
[0086] S4. Use tweezers to remove the sample and place it in another beaker containing fresh dichloromethane. Use ultrasonic vibration again to remove the rolling oil more thoroughly.
[0087] S5. Remove the sample and place it in a petri dish. Dry it in a constant temperature blower at 60℃. The recommended temperature range is 45-100℃.
[0088] S6. The dried sample is subjected to a load-bearing test, and the result is recorded as m1.
[0089] S7. The formula for calculating oil content is: (m0-m1) / m0×100%.
[0090] Table 1
[0091]
[0092]
[0093] It can be seen from the above table:
[0094] (1) Compared with Example 2, it can be seen that in this application, multiple overflow plates are set in the extraction tank, and the overflow direction of the extractant is opposite to the movement direction of the foil by the different heights of the overflow plates, so as to realize multi-stage countercurrent extraction of the foil, improve the contact effect between the foil surface and the extractant, and after extraction, the rolling oil floats on the surface of the extractant liquid, so that the liquid layer containing the rolling oil on the surface can be discharged by overflow, effectively ensuring the extraction effect of the extraction tank.
[0095] (2) Compared with Example 3, Example 2 shows that this application achieves internal circulation of the extractant by circulating and cooling the extractant, ensuring the uniformity of the extractant in the extraction chamber, improving the turbulent flow of the extractant, and ensuring the contact disturbance between the extractant and the foil, thereby improving the extraction effect. Furthermore, the extractant comes into contact with the cooler during the circulation process to cool down, reduce the temperature of the extractant, reduce the evaporation of the extractant and the evaporation of water vapor, thereby reducing water vapor condensation.
[0096] (3) Compared with Example 4, in this application, by introducing gas into the extraction tank, a slightly positive pressure state is formed in the extraction tank, which effectively prevents water vapor in the ambient gas from entering the extraction tank, reduces water vapor condensation, and reduces the volatilization of the extractant by means of slightly positive pressure.
[0097] Through the above embodiments, this application performs extraction and drying treatment on rolled foil to achieve continuous and efficient removal of rolling oil from the foil surface. After rolling, the foil temperature rises and enters the extraction tank to contact the extractant, effectively removing the surface rolling oil. Moreover, the liquid seal structure reduces the volatilization of the extractant and the generation of condensate, preventing condensate from dripping onto the foil surface and affecting the surface properties of the foil. The oil content can be reduced to below 0.1%.
[0098] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims, and the specification and drawings can be used to interpret the content of the claims.
Claims
1. A foil rolling degreasing device, characterized in that, The device includes a foil rolling mill, an extraction tank, and a dryer arranged sequentially along the foil material movement direction. The extraction tank is used to inject an extractant, and a liquid seal structure is provided at the opening of the extraction tank. The foil rolling mill is used to roll the foil material, and the dryer is used to dry the foil material. A positive pressure gas source is connected above the liquid surface in the extraction tank, and the positive pressure gas source is used to maintain the gas pressure in the extraction tank greater than the ambient gas pressure. The extraction tank is provided with multiple overflow plates, the height of which increases sequentially along the movement direction of the foil. The overflow plates divide the extraction tank to form multiple extraction chambers. Each extraction chamber is provided with a circulating cooler, which is used to regulate the temperature of the extractant in the extraction chamber. The circulating cooler includes a circulation pipeline that is circulatedly connected to the extraction chamber, and a circulation pump and a cooler are provided on the circulation pipeline. The foil rolling degreasing device also includes a foil conveyor, which is used to convey foil from the foil rolling mill and extraction tank to the dryer.
2. The foil rolling degreasing apparatus as described in claim 1, characterized in that, Located on the foil input side of the extraction tank, the extraction tank is provided with an extractant outlet. Located on the foil output side of the extraction tank, the extraction tank is provided with an extractant inlet. The extractant enters through the extractant inlet, flows sequentially through each extraction chamber, and is discharged through the extractant outlet.
3. The foil rolling degreasing apparatus as described in claim 1, characterized in that, Each of the extraction chambers is independently provided with a drain port, and the drain ports are all located at the bottom of the extraction tank.
4. The foil rolling degreasing apparatus according to any one of claims 1-3, characterized in that, The liquid seal structure includes a sealing plate covering the opening of the extraction tank. The sealing plate is provided with at least one vent. Each vent is provided with a liquid storage tank surrounding the vent and a sealing cap. The edge of the sealing cap is immersed below the liquid surface of the liquid storage tank.
5. The foil rolling degreasing apparatus according to any one of claims 1-3, characterized in that, The dryer includes a housing and a plurality of air nozzles disposed within the housing, the air nozzles being arranged sequentially along the movement direction of the foil.
6. The foil rolling degreasing apparatus according to any one of claims 1-3, characterized in that, The foil conveyor includes an unwinding mechanism, a winding mechanism, a tensioning mechanism, and multiple conveying rollers; The unwinding mechanism is located on the feed side of the foil rolling mill, and the winding mechanism is located on the discharge side of the dryer.
7. The foil rolling degreasing apparatus as described in claim 6, characterized in that, The tension mechanism includes at least one tension roller for providing foil tension; The tension rollers include a first tension roller, a second tension roller, and a third tension roller. The first tension roller is disposed between the unwinding mechanism and the foil rolling mill, the second tension roller is disposed between the foil rolling mill and the extraction tank, and the third tension roller is disposed between the extraction tank and the dryer.
8. A method for degreasing foil during rolling, characterized in that, The rolling degreasing method employs the foil rolling degreasing apparatus according to any one of claims 1-7, and the rolling degreasing method includes the following steps: After the foil is rolled, it is subjected to extraction and drying processes in sequence to remove the rolling oil from the surface of the foil. The extraction process involves cooling the extractant; a protective atmosphere is used during the extraction process, and the pressure of the protective atmosphere is greater than the ambient gas pressure.
9. The degreasing method as described in claim 8, characterized in that, The extraction process employs countercurrent contact extraction, where the movement direction of the foil is opposite to the flow direction of the extractant.
10. The degreasing method as described in claim 8, characterized in that, The drying temperature is 60~100℃.
11. The degreasing method as described in claim 8, characterized in that, The protective atmosphere includes nitrogen.
12. The degreasing method as described in claim 8, characterized in that, The extraction process includes dichloromethane as the extractant.