Release film processing technology

Abstract

The invention relates to the field of release film processing technologies, and provides a release film processing technology which comprises the following steps: S1, pretreating a base material; s2, preparing a coating liquid, wherein the coating liquid is a water-based coating liquid; s3, coating by using an anilox roller; s4, gradient curing is conducted; and S5, winding is conducted through a winding device. The method has the effect of reducing the energy consumption in the curing process in the release film processing.

Description

Technical Field

[0001] The present application relates to the field of release film processing technology, and in particular to a release film processing process. Background Art

[0002] Release films are commonly used to protect adhesives and are widely used in electronics, medical, and other fields. Common release film materials include PET and PE. During the processing of release films, a curing process is required, and existing curing processes consume a lot of energy.

[0003] Release liner, a functional film material, is widely used in electronics, medical, and other fields. It is primarily used to protect adhesive surfaces and prevent adhesion during processing or storage. As market demand for release liner continues to grow, its processing technology is also gaining attention. The performance of release liner depends not only on the choice of raw materials but also on the processing technology. By optimizing the processing technology, the quality and performance of release liner can be effectively improved to meet the needs of different application scenarios.

[0004] In the release film processing process, the curing process is one of the key links. Currently, the commonly used curing methods in the industry include thermal curing, UV curing, and infrared curing. Thermal curing usually uses a heating device to dry the coated substrate to promote the cross-linking reaction of the coating; UV curing uses ultraviolet radiation to quickly cure the photosensitive material; and infrared curing uses mid-infrared radiation to accelerate the cross-linking reaction of the active groups in the coating. In addition, some processes combine multiple curing methods, such as pre-curing followed by other curing methods to improve curing efficiency and coating quality.

[0005] However, existing curing processes generally suffer from high energy consumption. Whether using traditional thermal curing or a combination of UV and infrared curing, they all require significant energy to maintain equipment operation or achieve the desired curing effect. Especially in large-scale production, high energy consumption not only increases production costs but also places a significant burden on the environment. This has become a bottleneck restricting the further development of release film processing technology. Summary of the Invention

[0006] In order to reduce energy consumption during the curing process in release film processing, the present application provides a release film processing process.

[0007] The present application provides a release film processing technology that adopts the following technical solutions: A release film processing process comprises the following steps: S1: substrate pretreatment; S2: Preparation of coating solution: The coating solution is prepared by weight: including 80 parts of epoxy-modified silicone resin, 5-10 parts of nano-titanium dioxide, 3 parts of photoinitiator, 0.5 parts of leveling agent, and 20 parts of deionized water; S3: coating with anilox roller; S4: Gradient curing: including: S41: pre-curing; S42: UV curing: under nitrogen protection, UV intensity 200mW / cm², irradiation time 3-5s; S43: infrared post-curing: mid-infrared irradiation for 10 seconds to promote cross-linking of epoxy groups; S5: Rewinding through the rewinding device.

[0008] By adopting the above-mentioned technical solution, using water-based coating liquid instead of traditional solvent-based coating liquid, combined with the gradient curing process, energy consumption can be significantly reduced. The water-based coating liquid uses deionized water as the solvent, which reduces the high-temperature heating step required for the volatilization of organic solvents during the coating process, thereby reducing the energy consumption during the drying process. At the same time, the gradient curing process uses a staged curing method, first pre-curing to remove moisture, and then using UV curing and infrared post-curing in sequence, making energy utilization more efficient. Especially in the UV curing stage, nitrogen is used to protect the environment, which improves the curing efficiency and reduces energy waste; and the subsequent infrared post-curing further promotes the cross-linking of epoxy groups, ensuring the performance of the coating while avoiding the excessive use of high-energy curing methods. The overall process significantly reduces energy consumption while ensuring the performance of the release film.

[0009] Optionally, in the step S4, the energy ratio of the UV curing to the infrared post-curing is 2:1.

[0010] By adopting the above technical solution, the energy ratio can optimize the energy distribution during the curing process. While ensuring the UV curing effect, it can make full use of infrared post-curing to promote the cross-linking of epoxy groups, thereby improving the curing efficiency of the release film and reducing energy consumption.

[0011] Optionally, the S3 step is specifically: thick coating using the anilox roller; the S41 step includes: S411: 80°C hot air drying to remove moisture; S412: thin coating using the anilox roller; S413: 80°C hot air drying to remove moisture.

[0012] By adopting the above technical solution, in step S3, an anilox roller performs an initial thick coating, forming a relatively thick coating. After the thick coating, it is dried using 80°C hot air. Then, an anilox roller performs a second thin coating, forming a thinner and more uniform protective layer on top of the initially cured coating. When applying the same amount of coating liquid, this batch drying method can further reduce energy consumption.

[0013] Optionally, the anilox roller includes an outer roller body and an elastic membrane, and an installation cavity is provided inside the outer roller body along its own length direction; the outer roller body is provided with a plurality of mesh holes, and the plurality of mesh holes pass through the cavity wall of the installation cavity; the elastic membrane is cylindrical and adheres to and abuts against the cavity wall of the air cavity, and the inner surface of the elastic membrane encloses to form the air cavity; the air cavity is externally connected to a vacuum pump and an air pump.

[0014] By adopting the above technical solution, when vacuum is applied, the elastic membrane contracts, reducing the volume of the mesh cells, thereby reducing the amount of coating liquid applied; when inflated, the elastic membrane expands, increasing the volume of the mesh cells, thereby increasing the amount of coating liquid applied. There is no need to provide a new anilox roller, and the same anilox roller can be used to complete the above-mentioned S3 and S412 steps, thereby improving operational convenience and the flexibility of the anilox roller.

[0015] Optionally, a support body is provided in the air cavity, and an outer diameter of the support body is smaller than a diameter of the air cavity; a support portion is provided on a peripheral side of the support body, and a side of the support portion away from the support body abuts against the elastic membrane.

[0016] By adopting the above technical solution, the structural strength of the outer roller body is enhanced by adding a support body and a support part; at the same time, effective support is formed for the elastic membrane, reducing the risk of transitional deformation or collapse of the elastic membrane, and ensuring that the elastic membrane can be opened in the true dragon and inflated state, thereby improving the uniformity and accuracy of the anilox roller coating.

[0017] Optionally, there are several support parts, and the support parts are arranged in a spiral shape around the support body; a spiral groove is provided on the inner wall of the elastic membrane, and the pitch of the spiral groove is the same as the pitch of the virtual spiral line formed by the support part, and the spiral groove is used for the support part to slide.

[0018] By adopting this technical solution, a detachable connection is achieved between the support body, the elastic membrane, and the outer roller. When connecting the support body, the support portion is screwed into the spiral groove. During installation, the support portion gradually presses against the elastic membrane, forcing it to rest tightly against the wall of the installation cavity. Simultaneously, the spiral groove and the support portion cooperate to limit the support body, reducing the risk of relative displacement between the support body, the elastic membrane, and the outer roller.

[0019] Optionally, the support portion is a spiral blade, the inner wall of the elastic membrane is provided with a spiral groove, and the support portion is threadedly engaged with the spiral groove.

[0020] By adopting this technical solution, a detachable connection is achieved between the support body, the elastic membrane, and the outer roller. When connecting the support body, the support portion is screwed into the spiral groove. During installation, the support portion gradually presses against the elastic membrane, forcing it to rest tightly against the wall of the installation cavity. Simultaneously, the spiral groove and the support portion cooperate to limit the support body, reducing the risk of relative displacement between the support body, the elastic membrane, and the outer roller.

[0021] Optionally, the elastic membrane is provided with a limiting ridge against the surface of the outer roller body, and the limiting ridge extends along the length direction of the outer roller body; the cavity wall of the mounting cavity is provided with a limiting groove for inserting the limiting ridge, and the limiting groove extends along the length direction of the outer roller body, and the two ends of the limiting groove respectively pass through the two end faces of the outer roller body.

[0022] By adopting the above technical solution, the support body is limited in the circumferential direction of the elastic membrane by utilizing the plug-in fit between the groove and the limiting convex strip.

[0023] Optionally, a ball bearing is provided on a side of the support portion away from the support body.

[0024] By adopting the above technical solution, on the one hand, in the process of screwing the support body into the air cavity, the friction between the support part and the elastic membrane is rolling friction, thereby reducing the risk of the support body driving the elastic membrane to shift relative to the outer roller body during rotation; on the other hand, the support body can be screwed into the air cavity more smoothly.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The coating is carried out using a water-based coating liquid, combined with a gradient curing process, and the pre-curing, UV curing and infrared post-curing steps, which reduces the energy consumption of the curing process, while promoting the full cross-linking of epoxy groups and improving the performance of the coating; 2. The anilox roller combines thick coating with thin coating, and cooperates with two hot air drying to remove moisture, ensuring the uniformity and stability of the coating, enhancing the quality and functionality of the release film, and reducing energy consumption to a certain extent; 3. A support body is provided in the installation cavity, and a support portion is provided on the peripheral side of the support body. The support portion is spirally arranged, and the elastic membrane is provided with a spiral groove for spiral engagement with the support portion, thereby enhancing the connection stability of the support body and ensuring the structural strength of the anilox roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0027] Figure 2 It is a flowchart for showing S4.

[0028] Figure 3 It is a flowchart for showing S41.

[0029] Figure 4 It is a schematic diagram for showing the structure of the anilox roller.

[0030] Figure 5 It is a schematic diagram used to show the internal structure of the anilox roller.

[0031] Figure 6 It is a schematic diagram for showing the structure of the support body.

[0032] Figure 7 It is a schematic diagram used to show the structure of the elastic membrane.

[0033] Figure 8 It is a structural diagram of Example 2 of the present application.

[0034] Explanation of the accompanying reference numerals: 1. anilox roller; 2. outer roller body; 21. mounting cavity; 22. mesh hole; 23. limiting groove; 3. cover body; 31. sealing gasket; 4. elastic membrane; 41. air cavity; 42. limiting ridge; 5. support body; 51. support portion; 52. ball. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] The embodiments of the present application disclose a release film processing process.

[0037] Example 1 Reference Figure 1-3 , a release film processing process includes the following steps: S1: Substrate pretreatment: S2: Preparation of coating solution; the coating solution is configured by weight: including 80 parts of epoxy-modified silicone resin, 5-10 parts of nano-titanium dioxide, 3 parts of photoinitiator, 0.5 parts of leveling agent, and 20 parts of deionized water; S3: coating with the anilox roller 1, specifically thick coating with the anilox roller 1; S4: Gradient curing, including: S41: Pre-curing, including: S411: 80℃ hot air drying to remove moisture; S412: Thinly apply using anilox roller 1; S413: Re-dry with 80℃ hot air to remove moisture; S42: UV curing: under nitrogen protection, UV intensity 200mW / cm², irradiation time 3-5s; S43: infrared post-curing: mid-infrared irradiation for 10 seconds to promote cross-linking of epoxy groups; S5: Rewinding through the rewinding device.

[0038] In the above step S4, the energy ratio of UV curing to infrared post-curing is 2:1.

[0039] During the pre-curing stage, the coated substrate is first placed in an 80°C hot air drying environment to remove excess moisture and prevent residual moisture from affecting the subsequent curing effect. A second thin coating is then applied using anilox roller 1, followed by another 80°C hot air drying. This process further optimizes the coating structure and lays the foundation for subsequent UV curing and infrared post-curing. During the UV curing stage, nitrogen is used to protect the environment, with the UV intensity set to 200mW / cm² and the irradiation time set to 3-5 seconds. This ensures sufficient curing of the coating while avoiding incomplete curing caused by oxygen inhibition. Finally, in the infrared post-curing stage, mid-infrared radiation is applied for 10 seconds to further promote the cross-linking of epoxy groups, ultimately completing the entire curing process.

[0040] Epoxy-modified silicone resins offer excellent heat resistance and adhesion, effectively improving coating performance. Nano-titanium dioxide particles can be spherical with an average particle size of 20-50nm, and their surface is treated with a silane coupling agent to enhance their bonding with the resin. Benzoin dimethyl ether can be used as a photoinitiator, as it rapidly decomposes under ultraviolet light to generate free radicals, promoting the curing reaction. Polydimethylsiloxanes can be used as leveling agents to improve coating uniformity.

[0041] The anilox roller 1 includes an outer roller body 2 , a cover body 3 and an elastic membrane 4 .

[0042] The outer roller body 2 has a mounting cavity 21 defined along its length, one end of which extends through one end face of the outer roller body 2. The outer roller body 2 has a plurality of cells 22 defined along its circumferential wall. These cells 22 are distributed along the outer surface of the outer roller body 2 and extend through the wall of the mounting cavity 21. The cells 22 are used to store the coating liquid.

[0043] The cover body 3 is detachably connected to the end of the outer roller body 2 by bolts, and a sealing gasket 31 is provided between the cover body 3 and the outer roller body 2 .

[0044] The elastic film 4 is cylindrical, with its outer wall abutting against the wall of the mounting cavity 21. The inner surface of the elastic film 4 and the inner surface of the sealing gasket 31 enclose an air cavity 41, which is externally connected to a vacuum pump and an air pump. During the release film processing process, a thick coating of the coating liquid is first applied in step S3, followed by hot air drying in step S411 to remove moisture. After this moisture is removed, the air pump is used to inflate the air cavity 41, causing the elastic film 4 to expand slightly, reducing the volume of the cells 22, and allowing the substrate to return to the position of the anilox roller 1 for thin coating in step S412, eliminating the need for a new anilox roller 1.

[0045] The elastic membrane 4 can be made of polyurethane or silicone rubber, both of which offer excellent elasticity and solvent resistance, adapting to varying coating requirements. To adjust the coating thickness, a vacuum pump can be used to draw air from the elastic membrane 4, pressing it against the outer roller 2, thereby reducing the opening area of ​​the cells 22 for a thin coating. Conversely, an air pump can be used to inflate the air cavity 41, expanding the elastic membrane 4 and increasing the opening area of ​​the cells 22 for a thicker coating.

[0046] In addition, under the above structure, the elastic membrane 4 is detachable relative to the outer roller body 2. After a certain period of use, the elastic membrane 4 can be removed to effectively clean the elastic membrane 4 and the outer roller body 2. The cleaning process is relatively convenient and fast.

[0047] Furthermore, a support body 5 is disposed within the air cavity 41. The outer diameter of the support body 5 is slightly smaller than the diameter of the air cavity 41. A support portion 51 is disposed around the periphery of the support body 5. The side of the support portion 51 facing away from the support body 5 abuts against the elastic membrane 4. The support body 5 and the support portion 51 are made of hard plastic or metal.

[0048] In this embodiment, the support portion 51 is arranged in a rod shape, and there are several support portions 51. The several support portions 51 are arranged in a spiral shape around the support body 5. A spiral groove is provided on the inner surface of the elastic membrane 4. The pitch of the spiral groove is the same as the pitch of the virtual spiral line formed by the several support portions 51. The spiral groove is used for the support portion 51 to slide.

[0049] In other embodiments, the support portion 51 may also be a spiral blade. In this case, a plurality of air holes may be opened through the surface of the support portion 51 to facilitate gas circulation.

[0050] Furthermore, the elastic membrane 4 is integrally formed with a plurality of positioning ridges 42 abutting against the surface of the outer roller body 2. The positioning ridges 42 extend along the length of the outer roller body 2 and are arranged at equal intervals along the circumference of the elastic membrane 4. The outer roller body 2 has a plurality of positioning grooves 23 defined in the wall of the mounting cavity 21 for receiving the positioning ridges 42. The positioning grooves 23 extend along the length of the outer roller body 2, with both ends of the positioning grooves 23 penetrating the two end surfaces of the outer roller body 2. Thus, the positioning ridges 42 cooperate with the positioning grooves 23 to allow the elastic membrane 4 to rotate with the support body 5.

[0051] Furthermore, a metal wire with greater hardness is embedded inside the limiting protrusion 42 to facilitate inserting the elastic membrane 42 into the installation cavity 21 .

[0052] The implementation principle of Example 1 is as follows: a water-based coating fluid replaces the traditional solvent-based coating fluid, and a gradient curing process organically combines pre-curing, UV curing, and infrared post-curing to achieve efficient energy utilization. The pre-curing stage removes moisture, reducing energy waste during the subsequent curing process; the UV curing stage utilizes high-intensity ultraviolet light to rapidly cure the surface, forming a dense protective layer; and the infrared post-curing stage focuses on deep curing to ensure the overall quality of the coating. Furthermore, a double coating process is performed using an anilox roller 1 with variable cell depth, ensuring effective coating while reducing material waste and energy consumption.

[0053] Example 2 Reference Figure 8 This embodiment differs from Embodiment 1 in that a ball 52 is rollingly connected to the end of the support portion 51 away from the support body 5. This design, on the one hand, allows the friction between the support portion 51 and the elastic membrane 4 to be rolling friction during the process of screwing the support body 5 into the air cavity 41, thereby reducing the risk of the support body 5 causing the elastic membrane 4 to shift relative to the outer roller 2 during the screwing process; on the other hand, it allows the support body 5 to be screwed into the air cavity 41 more smoothly.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A release film processing process, characterized in that: The steps include: S1: substrate pretreatment; S2: Preparation of coating solution: The coating solution is prepared by weight: including 80 parts of epoxy-modified silicone resin, 5-10 parts of nano-titanium dioxide, 3 parts of photoinitiator, 0.5 parts of leveling agent, and 20 parts of deionized water; S3: coating using anilox roller (1); S4: Gradient curing: including: S41: pre-curing; S42: UV curing: under nitrogen protection, UV intensity 200mW / cm², irradiation time 3-5s; S43: infrared post-curing: mid-infrared irradiation for 10 seconds to promote cross-linking of epoxy groups; S5: Rewinding through the rewinding device.

2. A release film processing process according to claim 1, characterized in that: In the step S4, the energy ratio of the UV curing to the infrared post-curing is 2:

1.

3. The release film processing process according to claim 1, characterized in that: The S3 step specifically comprises: thick coating using the anilox roller (1); the S41 step comprises: S411: 80° C. hot air drying to remove moisture; S412: thin coating using the anilox roller (1); S413: 80° C. hot air drying to remove moisture.

4. A release film processing process according to claim 3, characterized in that: The anilox roller (1) comprises an outer roller body (2) and an elastic membrane (4); a mounting cavity (21) is provided inside the outer roller body (2) along its length direction; the outer roller body (2) is provided with a plurality of mesh holes (22), and the plurality of mesh holes (22) pass through the cavity wall of the mounting cavity (21); the elastic membrane (4) is cylindrical and abuts against the cavity wall of the mounting cavity (21); the inner surface of the elastic membrane (4) encloses an air cavity (41); and the air cavity (41) is externally connected to a vacuum pump and an air pump.

5. A release film processing process according to claim 4, characterized in that: A support body (5) is provided in the air cavity (41), and the outer diameter of the support body (5) is smaller than the diameter of the air cavity (41); a support portion (51) is provided on the peripheral side of the support body (5), and the side of the support portion (51) away from the support body (5) abuts against the elastic membrane (4).

6. A release film processing process according to claim 5, characterized in that: The support portion (51) is arranged in a rod shape, and a plurality of the support portions (51) are provided, and the plurality of the support portions (51) are arranged in a spiral shape around the support body (5); a spiral groove is provided on the inner surface of the elastic membrane (4), and the pitch of the spiral groove is the same as the pitch of the virtual spiral line formed by the plurality of the support portions (51), and the spiral groove is used for the support portion (51) to slide.

7. The release film processing process according to claim 5, characterized in that: The support portion (51) is a spiral blade, the inner wall of the elastic membrane (4) is provided with a spiral groove, and the support portion (51) is threadably engaged with the spiral groove.

8. A release film processing process according to claim 6 or 7, characterized in that: The elastic membrane (4) is in contact with the surface of the outer roller body (2) to form a limiting convex strip (42), and the limiting convex strip (42) is extended along the length direction of the outer roller body (2); the cavity wall of the installation cavity (21) is provided with a limiting groove (23) for inserting the limiting convex strip (42), and the limiting groove (23) is extended along the length direction of the outer roller body (2), and the two ends of the limiting groove (23) respectively pass through the two end faces of the outer roller body (2).

9. A release film processing process according to claim 6 or 7, characterized in that: A ball (52) is provided on a side of the support portion (51) away from the support body (5).

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