A linerless aluminum foil tape and a silicon coating device and method thereof

Abstract

The application discloses a kind of paperless aluminum foil adhesive tape and its silicon coating device and method, it is related to adhesive tape manufacturing technical field, including: multilayer composite substrate, pressure-sensitive adhesive layer and functional composite release layer, the multilayer composite substrate at least includes a metal foil layer and a polymer reinforced film layer;The pressure-sensitive adhesive layer is arranged at the first side of the multilayer composite substrate;The functional composite release layer is arranged at the second side of the multilayer composite substrate, the functional composite release layer includes microporous adsorption primer layer immediately adjacent to the multilayer composite substrate, and the lubricating topcoat layer is covered on the microporous adsorption primer layer, the invention can realize the technical effect that silicon is uniformly coated, reliable, silicon powder recycling is used, green and environmental protection, and the combination with foaming material is strong, substrate strength is high, and it is not easy to tear.

Description

Technical Field

[0001] This invention relates to the field of adhesive tape manufacturing technology, and in particular to a paperless aluminum foil tape and its silicone coating apparatus and method. Background Technology

[0002] Aluminum foil tape is widely used in the home appliance industry (such as pipe fixing and insulation sealing in air conditioners and refrigerators) and the construction industry (such as duct sealing) due to its excellent heat insulation, moisture resistance and corrosion resistance. Traditional aluminum foil tape generally consists of a three-layer structure of aluminum foil substrate, pressure-sensitive adhesive layer and release paper (backing paper). When using it, the backing paper must be peeled off first before it can be pasted, which is not only cumbersome, but also generates waste paper that pollutes the workshop environment.

[0003] To address these issues, paperless aluminum foil tape was developed. This type of product forms an anti-stick layer by coating the back of the aluminum foil substrate with silicone oil or silicone powder, preventing adjacent layers from sticking together after the tape is rolled up, allowing for direct use. However, current paperless aluminum foil tape and its manufacturing equipment still face numerous technical challenges: Poor uniformity of silicone coating: Existing silicone coating equipment mostly uses a single silicone coating roller or a scraper coating method, which results in uneven distribution of silicone oil / silicone powder on the aluminum foil surface, poor local anti-sticking effect, and easy adhesion or difficulty in tearing when unwinding the tape.

[0004] Silicon powder recycling presents significant challenges and waste: In powder coating methods, large amounts of silicon powder fail to adhere effectively to the aluminum foil surface and scatter, resulting in material waste and environmental pollution. Existing receiving bins lack efficient recycling mechanisms.

[0005] Insufficient adhesion between silicone oil layer and subsequent processes: In applications such as refrigerator manufacturing, the back of aluminum foil tape needs to be bonded to polyurethane foam material. However, the surface energy of the existing silicone oil treatment layer is too low, resulting in weak adhesion to the foam material and easy delamination and peeling.

[0006] Aluminum foil substrate has limited strength: Pure aluminum foil has low tensile strength and is prone to tearing when applied to curved or irregular surfaces, affecting construction quality and product lifespan.

[0007] To address the aforementioned problems, this invention aims to provide a paperless aluminum foil tape and its dedicated silicone coating device and method, so as to achieve the technical effects of uniform silicone coating, recyclable silicone powder, good anti-sticking performance, and strong adhesion to foaming materials. Summary of the Invention

[0008] The purpose of this invention is to provide a paperless aluminum foil tape and its silicone coating device and method to solve the problems existing in the prior art. The silicone coating is uniform, the anti-sticking is reliable, the silicone powder can be recycled, it is green and environmentally friendly, the bonding force with foaming materials is strong, the substrate strength is high, and it is not easy to tear.

[0009] To achieve the above objectives, the present invention provides the following solution: This invention provides a paperless aluminum foil tape, comprising: a multilayer composite substrate, a pressure-sensitive adhesive layer, and a functional composite anti-stick layer. The multilayer composite substrate includes at least one metal foil layer and one polymer reinforcing film layer. The pressure-sensitive adhesive layer is disposed on a first side of the multilayer composite substrate. The functional composite anti-stick layer is disposed on a second side of the multilayer composite substrate. The functional composite anti-stick layer includes a microporous adsorption base coating adjacent to the multilayer composite substrate and a lubricating top coating covering the microporous adsorption base coating.

[0010] Preferably, the multilayer composite substrate is composed of a first aluminum foil layer, a polymer reinforcing film layer, and a second aluminum foil layer sequentially laminated together, with the polymer reinforcing film layer sandwiched between the first aluminum foil layer and the second aluminum foil layer.

[0011] Preferably, the polymer-reinforced film is a polyethylene terephthalate film or a polyimide film, the thickness of the polymer-reinforced film is 12-25 μm, and the thickness of the first aluminum foil layer and the second aluminum foil layer are each independently 6-10 μm.

[0012] Preferably, the microporous adsorption base coating is an acrylate coating containing hydrophobically modified fumed silica, the thickness of the microporous adsorption base coating is 2-5 μm, and a micron-sized pore structure is formed on the surface away from the multilayer composite substrate; the lubricating top coating is a silicone oil lubricating layer, and the thickness of the lubricating top coating is 1-3 μm.

[0013] Preferably, the functional composite anti-stick layer further includes a plurality of silicon powder particles, which are embedded in the surface of the lubricating top coating and partially protrude to form a micro-rough anti-stick surface.

[0014] The present invention also provides a silicone coating apparatus for preparing paperless aluminum foil tape as described in any of the preceding claims, comprising: a frame, a base coating unit, a lubricating layer coating unit, and a particle-assisted coating unit, an unwinding mechanism mounted on the frame, a winding mechanism, and a plurality of guide rollers; the base coating unit is disposed downstream of the unwinding mechanism and is used to coat and dry the second side of the multilayer composite substrate to form the microporous adsorption base coating; the lubricating layer coating unit is disposed downstream of the base coating unit and is used to coat and cure the surface of the microporous adsorption base coating to form the lubricating top coating; the particle-assisted coating unit is disposed between the lubricating layer coating unit and the winding mechanism and is used to uniformly disperse silicon powder particles on its surface before the lubricating top coating is cured, and to embed some silicon powder particles into the lubricating top coating to form a functional composite anti-stick layer with a micro-rough structure.

[0015] Preferably, the primer unit includes a primer trough, a first anilox coating roller, a first rubber pressure roller, a first oven, and a cooling roller connected in sequence. The primer trough contains acrylic coating material for forming a microporous adsorption primer layer. A first discharge port is provided at the bottom of the primer trough. The first anilox coating roller is rotatably disposed at the first discharge port and sealed to the first discharge port. The first rubber pressure roller is disposed parallel to the first anilox coating roller below it, and a first coating gap is formed between the first rubber pressure roller and the first anilox coating roller for the multilayer composite substrate to pass through. The first oven is disposed downstream of the first anilox coating roller and is used to dry the coated acrylic coating material to evaporate the solvent in the acrylic coating material and form a microporous adsorption primer layer with a micron-level pore structure. The cooling roller is disposed downstream of the first oven and is used to cool and set the dried multilayer composite substrate.

[0016] Preferably, the lubricating layer coating unit includes a lubricant tank, a second anilox roller, a second rubber pressure roller, and a second oven. The lubricant tank contains silicone oil for forming a lubricating top coating. A second discharge port is provided at the bottom of the lubricant tank. The second anilox roller is rotatably disposed at the second discharge port and sealed to the second discharge port. The second rubber pressure roller is disposed parallel to the second anilox roller below it, and a second coating gap is formed between the second rubber pressure roller and the second anilox roller for the passage of a multilayer composite substrate coated with a microporous adsorption undercoating layer. The second oven is disposed downstream of the second anilox roller and is used to perform low-temperature curing treatment on the coated silicone oil to form the lubricating top coating.

[0017] Preferably, the particle-assisted coating unit is located between the second anilox roller and the second oven. The particle-assisted coating unit includes a storage hopper, a vibrating powder spreader, a pair of extrusion rollers, and a recycling hopper. The storage hopper is used to store silicon powder particles, and its bottom has a discharge port connected to the vibrating powder spreader. The vibrating powder spreader uses high-frequency vibration to evenly disperse and spread the silicon powder particles onto the surface of the lubricating top coating layer that has been initially coated by the lubricating layer coating unit. The pair of extrusion rollers are located downstream of the powder spreading position, and their roller surfaces can apply a preset pressure to the lubricating top coating layer containing silicon powder particles, so that some silicon powder particles are embedded in the incompletely cured lubricating top coating layer, while pressing off the excess silicon powder particles. The recycling hopper is located directly below the extrusion rollers and the vibrating powder spreader, and is used to collect the scattered silicon powder particles.

[0018] The present invention also provides a silicon coating method using the silicon coating apparatus described above, comprising the following steps: S1. Substrate unwinding: The multi-layer composite substrate is installed on the unwinding mechanism and guided to the primer unit by guide rollers to ensure that the substrate surface is flat and wrinkle-free. S2. Microporous adsorption base coating: The multilayer composite substrate enters the base coating unit. The first anilox coating roller dips the acrylic coating from the base coating trough and, with the cooperation of the first rubber pressure roller, coats the second side of the substrate to form a wet film. Then, it enters the first drying oven and is dried at 80-120℃ for 3-5 minutes to evaporate the solvent and form a microporous adsorption base coating with a thickness of 2-5μm and a surface with micron-level pore structure. The coating is then cooled to room temperature by a cooling roller. S3. Lubricating top coating coating: The substrate with microporous adsorption base coating enters the lubricating layer coating unit. The second anilox roller dips silicone oil from the lubricant tank and coats a silicone oil wet film on the base coating surface through the second rubber pressure roller. The coating thickness is controlled at 1-3μm. S4. Silicon Powder Particle Embedding: The substrate coated with silicone oil immediately enters the particle-assisted coating unit. The silicon powder particles in the storage hopper are evenly spread on the uncured silicone oil surface by a vibrating powder spreader. Then, through a pair of extrusion rollers, some of the silicon powder particles are pressed into the silicone oil layer under a pressure of 0.3-0.5MPa, and the excess silicon powder particles fall into the recycling hopper for recycling. S5. Curing of the lubricating top coating: The substrate with the embedded silicon powder particles is placed in the second oven and cured at 60-80℃ for 10-15 minutes to allow the silicone oil to fully cure and form the lubricating top coating, which together with the microporous adsorption bottom coating constitutes a functional composite anti-stick layer. S6. Rewinding: The qualified paperless aluminum foil tape is wound into a roll by the rewinding mechanism, and the winding tension is controlled at 50-80N.

[0019] The present invention achieves the following technical effects compared to the prior art: This invention provides a paperless aluminum foil tape and its silicone coating device and method. The overall strength of the tape is improved by the structural design of the multi-layer composite substrate. The polymer reinforcing film layer is sandwiched between the first aluminum foil layer and the second aluminum foil layer, which makes the tape less prone to tearing when applied to curved or irregular surfaces, effectively ensuring construction quality and product life.

[0020] Furthermore, the functional composite anti-stick layer consists of a microporous adsorption base layer and a lubricating top layer. The microporous adsorption base layer is an acrylate coating containing hydrophobically modified fumed silica, and the micron-sized pore structure formed on its surface can enhance the adhesion with the lubricating top layer. Furthermore, the lubricating top coating is a silicone oil layer, and the silicone powder particles are embedded in its surface to form a micro-rough structure, which not only ensures good anti-stick performance, but also solves the problem of weak bonding between traditional silicone oil layers and polyurethane foam materials. In application scenarios such as refrigerator manufacturing, it can effectively avoid delamination and peeling.

[0021] Furthermore, in terms of the silicon coating equipment, both the primer coating unit and the lubricating layer coating unit adopt a coating method that combines anilox rollers and rubber pressure rollers to ensure the uniformity of the coating. The vibrating powder spreader in the particle-assisted coating unit achieves uniform distribution of silicon powder particles, and the extrusion roller can press some silicon powder particles into the uncured silicone oil layer. At the same time, the recycling hopper collects excess silicon powder, realizing the recycling of silicon powder and reducing material waste and environmental pollution. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the paperless aluminum foil tape provided by the present invention; Figure 2 A schematic diagram of the structure of a silicon coating device provided by the present invention; Figure 3 A front view of a silicon coating apparatus provided by the present invention; Figure 4 A front sectional view of a silicon coating apparatus provided by the present invention; Figure 5 A schematic diagram of the structure of a vibrating powder spreader in a silicone coating device provided by the present invention; In the diagram: 100, unlined aluminum foil tape; 101, first aluminum foil layer; 102, polymer-reinforced film layer; 103, second aluminum foil layer; 104, microporous adsorption base coating layer; 105, lubricating top coating layer; 106, silica powder particles; 107, pressure-sensitive adhesive layer; 200, frame; 300, base coating unit; 301, first anilox coating roller; 302, first rubber pressure roller; 303, first drying oven; 304, cooling roller; 305, base coating trough; 400, lubricating layer coating unit; 401, lubricant trough; 402, second anilox roller; 403, second rubber pressure roller; 404, second drying oven; 500, particle-assisted coating unit; 501, storage hopper; 502, vibrating powder spreader; 503, extrusion roller; 504, recycling hopper; 600, unwinding mechanism; 700, winding mechanism. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a paperless aluminum foil tape and its silicone coating device and method to solve the problems existing in the prior art. The silicone coating is uniform, the anti-sticking is reliable, the silicone powder can be recycled, it is green and environmentally friendly, the bonding force with foaming materials is strong, the substrate strength is high, and it is not easy to tear.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 This embodiment provides a paperless aluminum foil tape 100, such as Figure 1 As shown, the tape includes: a multilayer composite substrate, a pressure-sensitive adhesive layer 107, and a functional composite anti-stick layer. The multilayer composite substrate includes at least one metal foil layer and one polymer reinforcing film layer 102. The pressure-sensitive adhesive layer 107 is disposed on the first side of the multilayer composite substrate. The functional composite anti-stick layer is disposed on the second side of the multilayer composite substrate. The functional composite anti-stick layer includes a microporous adsorption base layer 104 adjacent to the multilayer composite substrate and a lubricating top layer 105 covering the microporous adsorption base layer 104. The multilayer composite substrate combines the characteristics of the metal foil layer and the polymer reinforcing film layer 102 to improve the overall performance of the tape. The double-layer structure design of the functional composite anti-stick layer gives the tape good anti-stick performance, meeting the requirements for use of paperless tape. The pressure-sensitive adhesive layer 107 ensures the adhesive function of the tape.

[0028] In a preferred embodiment, the multilayer composite substrate is formed by sequentially bonding a first aluminum foil layer 101, a polymer reinforcing film layer 102, and a second aluminum foil layer 103, with the polymer reinforcing film layer 102 sandwiched between the first aluminum foil layer 101 and the second aluminum foil layer 103. This specific composite structure fully utilizes the heat insulation, moisture-proof, and corrosion-resistant properties of aluminum foil, while the high strength and flexibility of the polymer reinforcing film layer 102 significantly improve the tensile strength and tear resistance of the tape, making it more durable and less prone to damage during use.

[0029] In a preferred embodiment, the polymer-reinforced film 102 is a polyethylene terephthalate (PET) film or a polyimide (PI) film. The thickness of the polymer-reinforced film 102 is 12-25 μm. The thickness of the first aluminum foil layer 101 and the second aluminum foil layer 103 are each independently 6-10 μm. PET or PI film has excellent physical properties. Within this thickness range, when combined with an aluminum foil layer of a specific thickness, a lightweight design can be achieved while ensuring the overall performance of the tape. At the same time, the flexibility and mechanical strength of the tape are optimized, making it suitable for various application scenarios.

[0030] In a preferred embodiment, the microporous adsorption base coating 104 is an acrylate coating containing hydrophobically modified fumed silica. The thickness of the microporous adsorption base coating 104 is 2-5 μm, and a micron-sized pore structure is formed on the surface away from the multilayer composite substrate. The lubricating top coating 105 is a silicone oil lubricating layer with a thickness of 1-3 μm. The hydrophobically modified fumed silica in the microporous adsorption base coating 104 combines with the acrylate coating, and the resulting micron-sized pore structure enhances the bonding force with the silicone oil lubricating layer. Furthermore, it can form a mechanical interlock when subsequently bonded with polyurethane foam materials, thereby improving the bonding strength. The silicone oil lubricating layer provides good lubricity and anti-stick properties, ensuring that adjacent layers do not stick together after the tape is rolled up, and that it is easy to unroll during use.

[0031] In a preferred embodiment, the functional composite anti-stick layer further includes a plurality of silicon powder particles 106. The silicon powder particles 106 are embedded in the surface of the lubricating top coating 105 and partially protrude to form a micro-rough anti-stick surface. The embedding of silicon powder particles 106 further reduces the contact area of ​​the tape surface, enhances the physical isolation effect, makes the anti-stick performance more reliable, effectively avoids the adhesion phenomenon when the tape is unwound, and improves the user experience of the tape.

[0032] Comparative Example To verify the technical advantages of the present invention, the following comparative examples are provided: Comparative Example 1: A single-layer 7μm aluminum foil substrate was used, with only a silicone oil layer coated (coating amount 1.0g / m). 2 It has no microporous undercoat and no silicon powder-assisted coating.

[0033] Comparative Example 2: Using a composite aluminum foil substrate (same as Example 1), only a silicone oil layer was coated (coating amount 1.0 g / m²). 2 ), without microporous undercoating and silicon powder assistance.

[0034] Comparative Example 3: A single-layer 7μm aluminum foil substrate was used, and a microporous undercoat layer + silicone oil layer + silicon powder assisted coating was applied according to the method of Example 3.

[0035] The test results are compared below:

[0036] The results showed that the composite aluminum foil substrate significantly improved the tensile strength (Comparative Example 1 and Comparative Examples 1 and 3); the microporous bottom coating significantly improved the adhesion to the foaming material (Comparative Example 1 and Comparative Example 2); and the silica powder-assisted coating effectively reduced the coefficient of friction and improved the anti-sticking performance (Comparative Example 1 and Comparative Example 2).

[0037] Example 2 This embodiment also provides a silicone coating apparatus for preparing the paperless aluminum foil tape 100 as described in Example 1. Figures 2-5 As shown, the system includes: a frame 200, a primer coating unit 300, a lubricant coating unit 400, and a particle-assisted coating unit 500; an unwinding mechanism 600 mounted on the frame 200; a rewinding mechanism 700; and several guide rollers. The primer coating unit 300 is located downstream of the unwinding mechanism 600 and is used to coat and dry the second side of the multilayer composite substrate to form a microporous adsorption primer coating 104. The lubricant coating unit 400 is located downstream of the primer coating unit 300 and is used to coat and cure the surface of the microporous adsorption primer coating 104 to form a lubricant top coating 105. The particle-assisted coating unit 500 is located downstream of the lubricant coating unit 300. Between the coating unit 400 and the winding mechanism 700, silicon powder particles 106 are evenly distributed on the surface of the lubricating top coating 105 before it cures, and some of the silicon powder particles 106 are embedded in the lubricating top coating 105 to form a functional composite anti-stick layer with a micro-rough structure. Each unit of this silicon coating device has a clear division of labor and works together to complete the coating preparation of the functional composite anti-stick layer of the paperless aluminum foil tape 100 in an orderly manner, ensuring the quality and performance stability of the product. At the same time, the setting of the unwinding mechanism 600, the winding mechanism 700 and the guide rollers ensures the smooth transmission of the substrate during the coating process.

[0038] In a preferred embodiment, the primer unit 300 includes a primer trough 305, a first anilox coating roller 301, a first rubber pressure roller 302, a first oven 303, and a cooling roller 304 connected in sequence. The primer trough 305 contains acrylic coating material for forming a microporous adsorption primer layer 104. A first discharge port is provided at the bottom of the primer trough 305. The first anilox coating roller 301 is rotatably disposed at the first discharge port and sealed to the first discharge port. The first rubber pressure roller 302 is disposed parallel to the bottom of the first anilox coating roller 301, and a first coating gap is formed between the first rubber pressure roller 302 and the first anilox coating roller 301 for the passage of a multilayer composite substrate. The first oven 303 is provided with... The first anilox coating roller 301 is positioned downstream of the first oven 303 to dry the coated acrylic coating, allowing the solvent in the acrylic coating to evaporate and form a microporous adsorption base coating 104 with a micron-level pore structure. The cooling roller 304 is positioned downstream of the first oven 303 to cool and set the dried multilayer composite substrate. This structural design of the base coating unit 300, through the cooperation of the anilox coating roller and the rubber pressure roller, can precisely control the coating amount and coating uniformity of the acrylic coating. The drying process in the first oven 303 enables the coating to form the required microporous structure, while the cooling roller 304 ensures the dimensional stability of the dried substrate, providing a good foundation for the subsequent coating of the lubricating top coating 105.

[0039] In a preferred embodiment, the lubricant coating unit 400 includes a lubricant tank 401, a second anilox roller 402, a second rubber pressure roller 403, and a second oven 404. The lubricant tank 401 contains silicone oil for forming the lubricant top coating 105. A second discharge port is provided at the bottom of the lubricant tank 401. The second anilox roller 402 is rotatably disposed at the second discharge port and sealed to the second discharge port. The second rubber pressure roller 403 is disposed parallel to and below the second anilox roller 402, and the second rubber pressure roller 403 and the second anilox roller 404 are positioned close together. A second coating gap is formed between 02 for the passage of the multilayer composite substrate coated with microporous adsorption base coating 104. The second oven 404 is located downstream of the second anilox roller 402 and is used to perform low-temperature curing treatment on the coated silicone oil to form a lubricating top coating 105. The structural design of the lubricating layer coating unit 400 can accurately coat the silicone oil onto the microporous adsorption base coating 104 and form a uniform and stable lubricating top coating 105 through low-temperature curing, ensuring the quality and performance of the lubricating top coating 105 and further enhancing the anti-sticking effect of the tape.

[0040] In a preferred embodiment, the particle-assisted coating unit 500 is disposed between the second anilox roller 402 and the second oven 404. The particle-assisted coating unit 500 includes a storage hopper 501, a vibrating powder spreader 502, a pair of extrusion rollers 503, and a recovery hopper 504. The storage hopper 501 is used to store silicon powder particles 106, and its bottom has a discharge port connected to the vibrating powder spreader 502. The vibrating powder spreader 502 uses high-frequency vibration to evenly disperse and spread the silicon powder particles 106 onto the surface of the lubricating top coating layer 105 that has been initially coated by the lubricating layer coating unit 400. The pair of extrusion rollers 503 are disposed between the powder spreader and the lubricating top coating layer 105. Downstream of the coating unit 500, the roller surface applies a preset pressure to the lubricating top coating 105 containing silicon powder particles 106, causing some of the silicon powder particles 106 to embed into the incompletely cured lubricating top coating 105, while pressing off excess silicon powder particles 106. A recycling hopper 504, located directly below the extrusion roller 503 and the vibrating powder spreader 502, collects the scattered silicon powder particles 106. The particle-assisted coating unit 500 evenly distributes the silicon powder particles 106 via the vibrating powder spreader 502. The extrusion roller 503 ensures that the silicon powder particles 106 are partially embedded in the lubricating top coating 105, forming a micro-rough, non-stick surface and improving non-stick performance. The recycling hopper 504 achieves the recycling of silicon powder particles 106, improving material utilization, reducing costs, and minimizing dust pollution in the production environment.

[0041] In a preferred embodiment, the vibratory powder spreader 502 includes a guide rail, a slider connecting rod, an electric turntable, and a powder spreader. The guide rail is fixedly connected to the frame 200, the slider is slidably connected to the guide rail, the electric turntable is mounted on the frame 200, one end of the connecting rod is rotatably connected to the slider, and the other end is rotatably connected to the outer circumference of the electric turntable, so that the slider can be driven to reciprocate linearly along the guide rail during the rotation of the electric turntable. The powder spreader is fixed on the slider, and its bottom is provided with several evenly distributed powder spreading holes. After the silicon powder particles 106 enter the powder spreader through the storage hopper 501, under the action of the reciprocating motion of the slider and its own gravity, they are evenly spread on the surface of the substrate through the powder spreading holes, which effectively avoids the problems of uneven powder spreading and local accumulation that are easy to occur in traditional fixed powder spreaders, and ensures that the silicon powder particles 106 form a uniformly distributed micro-protrusion structure on the surface of the lubricating top coating 105.

[0042] Example 3 This embodiment also provides a method for coating silicone onto paperless aluminum foil tape 100, including the following steps: (a) Preparation stage Substrate Installation: The multilayer composite substrate (first aluminum foil layer 101, polymer reinforcing film layer 102, and second aluminum foil layer 103 sequentially laminated) is installed on the unwinding mechanism 600, ensuring a secure installation and smooth unwinding of the substrate. In the multilayer composite substrate, the polymer reinforcing film layer 102 is a polyethylene terephthalate film or a polyimide film with a thickness of 12-25 μm, and the thickness of the first aluminum foil layer 101 and the second aluminum foil layer 103 is independently 6-10 μm.

[0043] Coating preparation: An acrylic coating containing hydrophobically modified fumed silica is placed in the primer tank 305 to form a microporous adsorption primer 104; a silicone oil is placed in the lubricant tank 401 to form a lubricating topcoat 105.

[0044] Equipment commissioning: Check whether each unit is operating normally, including the first anilox coating roller 301, first rubber pressure roller 302, first drying oven 303, and cooling roller 304 of the primer coating unit 300; the second anilox roller 402, second rubber pressure roller 403, and second drying oven 404 of the lubricating layer coating unit 400; and the storage hopper 501, vibrating powder spreader 502, extrusion roller 503, and recovery hopper 504 of the granule auxiliary coating unit 500. Adjust the parameters of each piece of equipment, such as coating gap, oven temperature, vibration frequency, and pressure, to ensure they meet the process requirements.

[0045] (II) Primer stage Coating operation: Start the unwinding mechanism 600 to allow the multilayer composite substrate to pass through the primer unit 300 at a set speed. The first outlet at the bottom of the primer trough 305 is sealed to the rotating first anilox coating roller 301. The acrylic coating flows into the first anilox coating roller 301 under gravity. The first anilox coating roller 301 transfers the coating to the first parallel rubber pressure roller 302 below. The multilayer composite substrate passes through the first coating gap between the first rubber pressure roller 302 and the first anilox coating roller 301, thereby uniformly coating the second side of the multilayer composite substrate with acrylic coating. The wet coating thickness is adjusted according to the target thickness of the microporous adsorption primer layer 104 2 - 5μm.

[0046] Drying treatment: The coated multilayer composite substrate enters the first drying oven 303 and is dried at a set temperature to evaporate the solvent in the acrylic coating, forming a microporous adsorption base coating 104 with a micron-level pore structure. The drying temperature can be set within a suitable range according to the characteristics of the coating, for example, 100-120℃.

[0047] Cooling and shaping: The dried multilayer composite substrate enters the cooling roller 304 for cooling and shaping, which makes the structure of the microporous adsorption base coating 104 more stable and provides a good foundation for the subsequent coating of the lubricating top coating 105.

[0048] (III) Lubricant coating stage Coating operation: The multilayer composite substrate, after completing the primer coating and cooling and setting, enters the lubricant coating unit 400. The second outlet at the bottom of the lubricant tank 401 is sealed to the rotating second anilox roller 402. Silicone oil flows into the second anilox roller 402, which transfers the silicone oil to the parallel second rubber pressure roller 403 below. The multilayer composite substrate passes through the second coating gap between the second rubber pressure roller 403 and the second anilox roller 402, so that the silicone oil is uniformly coated on the surface of the microporous adsorption primer coating 104. The coating amount is adjusted according to the target thickness of the lubricant top coating 105 of 1-3 μm.

[0049] Low-temperature curing: The multilayer composite substrate coated with silicone oil is placed in the second oven 404 for low-temperature curing to form a lubricating top coating 105. The low-temperature curing temperature can be set according to the characteristics of the silicone oil, for example, 60-80℃, to ensure that the silicone oil is cured and firmly bonded to the microporous adsorption bottom coating 104.

[0050] (iv) Particle-assisted coating stage Powder application: The multi-layer composite substrate, after initial coating with a lubricating layer, enters the particle-assisted coating unit 500. The bottom outlet of the storage hopper 501 is connected to the vibrating powder spreader 502. The silicon powder particles 106 are evenly dispersed and spread on the surface of the lubricating top coating 105, which has not yet fully cured, by the high-frequency vibration of the vibrating powder spreader 502. The amount of powder applied is adjusted according to requirements to ensure the formation of a uniform micro-rough, non-stick surface.

[0051] Particle embedding: The lubricating top coating 105 containing silicon powder particles 106 passes through a pair of extrusion rollers 503. The extrusion rollers 503 apply a preset pressure to the coating, causing some of the silicon powder particles 106 to embed into the incompletely cured lubricating top coating 105, while simultaneously pressing off the excess silicon powder particles 106. The pressure of the extrusion rollers 503 needs to be optimized based on factors such as the characteristics of the silicon powder particles 106 and the state of the lubricating top coating 105, for example, 0.2-0.5 MPa, to ensure good embedding effect of the silicon powder particles 106.

[0052] Silicon powder recycling: The spilled silicon powder particles 106 are collected by the recycling hopper 504 located directly below the extrusion roller 503 and the vibrating powder spreader 502. After screening and other processing, they can be returned to the storage hopper 501 for recycling, which improves the utilization rate of silicon powder, reduces costs and reduces dust pollution.

[0053] (v) Collection Stage After the granule-assisted coating is completed and the tape 100 is finally cured in the second oven 404, the paperless aluminum foil tape 100 is guided by guide rollers to the winding mechanism 700 for winding, resulting in the finished paperless aluminum foil tape 100. During the winding process, the winding tension needs to be controlled to ensure that the tape is wound tightly and neatly, facilitating subsequent storage and transportation.

[0054] By utilizing the above silicone coating method and the coordinated operation of each unit device, paperless aluminum foil tape 100 that meets performance requirements can be produced efficiently and stably, achieving good anti-sticking performance, high strength, and reliable bonding with other materials.

[0055] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A paperless aluminum foil tape, characterized in that: include: A multilayer composite substrate, wherein the multilayer composite substrate comprises at least one metal foil layer and one polymer reinforcing film layer; A pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is disposed on a first side of the multilayer composite substrate; and A functional composite anti-stick layer is disposed on the second side of the multilayer composite substrate. The functional composite anti-stick layer includes a microporous adsorption base layer adjacent to the multilayer composite substrate and a lubricating top layer covering the microporous adsorption base layer.

2. The paperless aluminum foil tape according to claim 1, characterized in that: The multilayer composite substrate is composed of a first aluminum foil layer, a polymer reinforcing film layer, and a second aluminum foil layer, which are sequentially composited, with the polymer reinforcing film layer sandwiched between the first aluminum foil layer and the second aluminum foil layer.

3. The paperless aluminum foil tape according to claim 1, characterized in that: The polymer-reinforced film is a polyethylene terephthalate film or a polyimide film, and the thickness of the polymer-reinforced film is 12-25 μm. The thickness of the first aluminum foil layer and the second aluminum foil layer are each 6-10 μm.

4. The paperless aluminum foil tape according to claim 1, characterized in that: The microporous adsorption undercoat is an acrylate coating containing hydrophobically modified fumed silica, the thickness of the microporous adsorption undercoat is 2-5 μm, and a micron-sized pore structure is formed on the surface away from the multilayer composite substrate. The lubricating topcoat is a silicone oil lubricating layer, the thickness of the lubricating topcoat is 1-3 μm.

5. The paperless aluminum foil tape according to claim 4, characterized in that: The functional composite anti-stick layer also includes multiple silicon powder particles, which are embedded in the surface of the lubricating top coating and partially protrude to form a micro-rough anti-stick surface.

6. A silicone coating apparatus for preparing the paperless aluminum foil tape according to any one of claims 1 to 5, characterized in that: include: A frame, and an unwinding mechanism, a winding mechanism, and several guide rollers mounted on the frame; A base coating unit, located downstream of the unwinding mechanism, is used to coat and dry the second side of the multilayer composite substrate to form the microporous adsorption base coating layer. A lubricating layer coating unit is disposed downstream of the primer coating unit and is used to coat and cure the microporous adsorption primer coating to form the lubricating top coating. as well as A particle-assisted coating unit is disposed between the lubricating layer coating unit and the winding mechanism. It is used to uniformly distribute silicon powder particles on the surface of the lubricating top coating before the lubricating top coating is cured, and to embed some silicon powder particles into the lubricating top coating to form a functional composite anti-sticking layer with a micro-rough structure.

7. The silicon coating apparatus according to claim 6, characterized in that: The primer unit includes a primer trough, a first anilox coating roller, a first rubber pressure roller, a first oven, and a cooling roller connected in sequence. The primer trough contains acrylic coating material for forming a microporous adsorption primer layer. A first discharge port is provided at the bottom of the primer trough. The first anilox coating roller is rotatably disposed at the first discharge port and sealed to the first discharge port. The first rubber pressure roller is disposed parallel to the first anilox coating roller below it, and a first coating gap is formed between the first rubber pressure roller and the first anilox coating roller for the multilayer composite substrate to pass through. The first oven is disposed downstream of the first anilox coating roller and is used to dry the coated acrylic coating material to evaporate the solvent in the acrylic coating material and form a microporous adsorption primer layer with a micron-level pore structure. The cooling roller is disposed downstream of the first oven and is used to cool and set the dried multilayer composite substrate.

8. The silicon coating apparatus according to claim 7, characterized in that: The lubricating layer coating unit includes a lubricant tank, a second anilox roller, a second rubber pressure roller, and a second oven. The lubricant tank contains silicone oil for forming a lubricating top coating. A second discharge port is provided at the bottom of the lubricant tank. The second anilox roller is rotatably disposed at the second discharge port and is sealed to the second discharge port. The second rubber pressure roller is disposed parallel to the second anilox roller below it, and a second coating gap is formed between the second rubber pressure roller and the second anilox roller for the passage of a multilayer composite substrate coated with a microporous adsorption undercoating layer. The second oven is disposed downstream of the second anilox roller and is used to perform low-temperature curing treatment on the coated silicone oil to form the lubricating top coating.

9. The silicon coating apparatus according to claim 8, characterized in that: The particle-assisted coating unit is located between the second anilox roller and the second oven. The particle-assisted coating unit includes a storage hopper, a vibrating powder spreader, a pair of extrusion rollers, and a recycling hopper. The storage hopper is used to store silicon powder particles, and its bottom has a discharge port connected to the vibrating powder spreader. The vibrating powder spreader uses high-frequency vibration to evenly disperse and spread the silicon powder particles onto the surface of the lubricating top coating layer that has been initially coated by the lubricating layer coating unit. The pair of extrusion rollers are located downstream of the powder spreading position, and their roller surfaces can apply a preset pressure to the lubricating top coating layer containing silicon powder particles, so that some silicon powder particles are embedded in the incompletely cured lubricating top coating layer, while pressing off the excess silicon powder particles. The recycling hopper is located directly below the extrusion rollers and the vibrating powder spreader, and is used to collect the scattered silicon powder particles.

10. A silicon coating method using the silicon coating apparatus as described in claim 9, characterized in that: Includes the following steps: S1. Substrate unwinding: The multi-layer composite substrate is installed on the unwinding mechanism and guided to the primer unit by guide rollers to ensure that the substrate surface is flat and wrinkle-free. S2. Microporous adsorption base coating: The multilayer composite substrate enters the base coating unit. The first anilox coating roller dips the acrylic coating from the base coating trough and, with the cooperation of the first rubber pressure roller, coats the second side of the substrate to form a wet film. Then, it enters the first drying oven and is dried at 80-120℃ for 3-5 minutes to evaporate the solvent and form a microporous adsorption base coating with a thickness of 2-5μm and a surface with micron-level pore structure. The coating is then cooled to room temperature by a cooling roller. S3. Lubricating top coating coating: The substrate with microporous adsorption base coating enters the lubricating layer coating unit. The second anilox roller dips silicone oil from the lubricant tank and coats a silicone oil wet film on the base coating surface through the second rubber pressure roller. The coating thickness is controlled at 1-3μm. S4. Silicon Powder Particle Embedding: The substrate coated with silicone oil immediately enters the particle-assisted coating unit. The silicon powder particles in the storage hopper are evenly spread on the uncured silicone oil surface by a vibrating powder spreader. Then, through a pair of extrusion rollers, some of the silicon powder particles are pressed into the silicone oil layer under a pressure of 0.3-0.5MPa, and the excess silicon powder particles fall into the recycling hopper for recycling. S5. Curing of the lubricating top coating: The substrate with the embedded silicon powder particles is placed in the second oven and cured at 60-80℃ for 10-15 minutes to allow the silicone oil to fully cure and form the lubricating top coating, which together with the microporous adsorption bottom coating constitutes a functional composite anti-stick layer. S6. Rewinding: The qualified paperless aluminum foil tape is wound into a roll by the rewinding mechanism, and the winding tension is controlled at 50-80N.

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