Device for separating release film waste from silicone layer based on hot pressing separation

Abstract

This invention discloses a release membrane waste and silicone oil layer separation device based on hot-pressing separation, belonging to the field of waste utilization technology. It aims to solve the technical problems of incomplete scraping and severe adhesion residue that easily occur in existing flat-plate pressing hot-pressing separation methods. This invention utilizes differentiated temperature control and rapid cooling to induce cracking, achieving automatic pre-cracking of the interface using thermal stress to reduce silicone oil residue. Combined with high-pressure directional airflow to precisely expand and crack micro-gap, it enhances the uniformity of local layering. Furthermore, it uses a partitioned flow guide frame to suppress turbulence, and negative pressure micro-cavity suction to achieve simultaneous layering at the center and edges. Finally, elastic scraping tentacles actively lift the silicone oil at the edges, eliminating edge residue. This progressive design strengthens the layering effect layer by layer, solving the pain points of traditional devices such as single temperature control, turbulent airflow, uneven layering, and edge residue, significantly improving the cleanliness of silicone oil separation and laying the foundation for efficient recycling.

Description

Technical Field

[0001] This invention relates to the field of waste utilization technology, and more specifically, to a device for separating release membrane waste from silicone oil layer based on hot-pressing separation. Background Technology

[0002] Release films, as commonly used industrial insulating materials, are widely applied in lithium batteries, composite materials, electronic die-cutting, adhesive products, and other fields. Single-sided rigid silicone release films, with a certain degree of hardness and a thickness of 125-250μm, have waste materials that can be refurbished and recycled in their entirety, making them an important target for solid waste resource utilization. The substrate of this type of waste is high-stiffness PET with a cross-linked silicone oil layer on the surface. The silicone oil has a strong interfacial bond with the substrate, making efficient and clean separation difficult using conventional recycling methods. Currently, hot-pressing separation equipment for rigid release film waste mostly adopts a flat-plate pressing hot-pressing + scraper removal process: first, the waste is heated as a whole by upper and lower heating plates to soften the silicone oil layer, and then the silicone oil layer is directly scraped off using a mechanical scraper.

[0003] Existing flat panel heating devices mostly use single-sided or double-sided heating at the same temperature, without differentiated temperature control for the silicone oil layer and PET substrate. This easily leads to insufficient softening of the silicone oil layer in certain areas and micro-deformation of the substrate due to overheating, resulting in large differences in interfacial adhesion. Incomplete debonding occurs in some areas, and silicone oil residue is easily left when scraped off with a scraper. Furthermore, after overall heating, the silicone oil layer is in a softened and viscous state. During the scraping process, the silicone oil that is not peeled off in time will quickly regain its viscosity as the temperature drops, and re-adhere to the PET substrate surface, forming a vicious cycle of "scraping off and sticking back," significantly increasing the amount of residue. Existing devices only rely on thermal softening to reduce adhesion, without creating interfacial micro-cracks through thermal stress. The scraper needs to forcibly peel off the silicone oil layer, which easily leads to fragmentation of the silicone oil layer. Fine debris adheres to the substrate surface and is difficult to remove completely, greatly reducing the cleanliness and reuse value of the recycled substrate.

[0004] In summary, existing flat-plate pressing hot-press separation devices are prone to problems such as incomplete scraping and severe adhesive residue due to their single temperature control method and lack of interface pre-cracking design. Therefore, we propose a hot-press separation device for separating release film waste from the silicone oil layer. Summary of the Invention

[0005] The purpose of this invention is to provide a release film waste and silicone oil layer separation device based on hot pressing separation, so as to solve the technical problems of incomplete scraping and serious adhesive residue that are easy to occur in the existing flat plate pressing hot pressing separation.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a release film waste and silicone oil layer separation device based on hot pressing separation, comprising a hot pressing main frame, a lower hot pressing plate installed in the processing area of ​​the hot pressing main frame, an upper hot pressing plate arranged above the lower hot pressing plate, a driving pressure component connected to the top center of the upper hot pressing plate, heating components installed inside both the lower and upper hot pressing plates, the heating temperature of the heating component inside the upper hot pressing plate being greater than that of the heating component inside the lower hot pressing plate, and a rapid cooling structure also provided on the lower hot pressing plate, wherein when the rapid cooling structure rapidly cools, the substrate of the release film waste and the silicone oil layer form an interface crack and delamination; The upper hot press plate is provided with a delamination structure, which includes high-pressure air grooves opened on the four sides of the upper hot press plate. The high-pressure air grooves are bent structures, and the outlets of the high-pressure air grooves are inclined towards the processing release film. The high-pressure air grooves are connected to a blower.

[0007] Preferably, the rapid cooling structure includes a cooling channel starting inside the lower hot platen, one interface of the cooling channel being connected to a circulating pump, the other interface of the circulating pump being connected to a coolant tank, and the coolant tank being connected to another interface of the cooling channel.

[0008] Preferably, the bottom of the upper hot press plate is provided with a partition groove, the partition groove is rectangular in shape, and an isolation frame is installed inside the partition groove.

[0009] Preferably, the isolation frame includes a hollow frame made of an elastic material, the hollow frame has a curved cross-section, and thermally sensitive deformation plates are installed on all four sides of the hollow frame, the thermally sensitive deformation plates being made of a material that can deform when heated.

[0010] Preferably, the bottom of the upper hot press plate is provided with four exhaust grooves in the area outside the partition groove, and the exhaust grooves pass through the upper hot press plate to guide the high-pressure airflow to be discharged.

[0011] Preferably, the bottom of the upper hot press plate has multiple negative pressure microcavities near the inner side of the partition groove. The negative pressure microcavities are connected to the exhaust groove. The diameter of the negative pressure microcavities is smaller than that of the exhaust groove. When the high-speed airflow is discharged from the exhaust groove, the negative pressure microcavities form negative pressure.

[0012] Preferably, the upper hot press plate is provided with multiple scraping tentacles near the edge area of ​​the release film waste, and the multiple scraping tentacles are arranged in a rectangular array.

[0013] Preferably, the scraping tip is made of an elastic material, the scraping tip is curved, and the scraping tip includes a wind-receiving side and a scraping side. The wind-receiving side is subjected to the wind force of the high-pressure air channel, which causes the scraping side to scrape the edge of the release film waste.

[0014] Preferably, a compensation component is installed on the bottom wall side of the exhaust channel. The compensation component includes a fixed side fixed to the bottom wall, and multiple air ports are opened on the fixed side. A hollow frame-shaped extension frame is provided on one side of the fixed side, and an air port block adapted to the air ports is connected to the inner circumference of the extension frame.

[0015] Preferably, a positioning frame is fixed to the top of the lower hot press plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs independent temperature control for the upper and lower hot press plates. The upper plate precisely softens the silicone oil layer at 155-175℃, reducing interfacial adhesion, while the lower plate preheats only the PET substrate at 120-140℃ to prevent thermal deformation. After heating, the substrate is rapidly cooled to 25-40℃ in 0.5-2 seconds using a rapid cooling structure. The thermal expansion of the silicone oil and the contraction of the substrate create reverse thermal stress, causing the interface to automatically crack and lift without mechanical hard cutting. This solves the problems of uneven silicone oil softening and substrate deformation caused by traditional uniform heating. After pre-cracking of the interface, the pressure of forced peeling by the scraper is greatly reduced, minimizing silicone oil residue and substrate damage, laying the foundation for clean separation.

[0017] 2. This invention features a high-pressure air groove that blows high-pressure airflow at an angle towards the interface, acting on the pre-cracked micro-gap. The airflow impact force opens the cracks and expands the separation gap. Addressing the shortcomings of traditional devices that rely solely on thermal softening and lack sufficient local delamination, the directional airflow can penetrate deep into the locally adhered areas, assisting in debonding and preventing localized "adhesion" of silicone oil. This also solves the problem of residue during scraping with a scraper. The directional airflow does not disturb the overall interface. Combined with the pre-cracking effect, it makes the silicone oil layer debonding more uniform, providing sufficient delamination conditions for subsequent peeling and significantly improving the separation cleanliness.

[0018] 3. This invention separates the inner layering zone from the outer exhaust zone using an isolation frame, guiding the airflow in a directional manner and suppressing turbulent flow to prevent airflow disturbance from causing silicone oil to re-adhere. At the same time, it utilizes the high-speed airflow in the exhaust channel to generate the Venturi effect, creating a stable negative pressure in the central negative pressure microcavity. This actively draws in the central silicone oil layer and pulls the interface cracks to propagate, solving the problems of turbulent airflow and weak central layering in traditional devices. It achieves synergistic layering through edge airflow cracking and central negative pressure pulling, ensuring uniform debonding of the silicone oil layer across the entire area, eliminating potential local residual problems in the center, and comprehensively improving the layering effect.

[0019] 4. This invention features an elastic, curved scraping tip at the edge. High-pressure airflow causes the tip to swing, actively scraping up the silicone oil layer at the edge and widening the separation gap. This addresses the issues of insufficient edge lifting and residue buildup in traditional devices. The flexible scraping tip does not damage the PET substrate and precisely lifts up the micro-cracked silicone oil at the edge, preventing it from adhering to the substrate. This complements the negative pressure at the center and the airflow expansion, achieving simultaneous and thorough layering across the entire area, including the edge and center, solving the problem of edge residue and further improving the cleanliness of the substrate.

[0020] 5. This invention incorporates a metal thermally conductive compensating component in the exhaust duct. During the heating phase, the exhaust duct is closed to compensate for the heating area, ensuring uniform temperature of the upper hot platen and consistent softening of the silicone oil. During the airflow phase, the exhaust duct is opened to achieve smooth backflow, balancing heating performance and airflow guidance. This addresses the shortcomings of traditional devices where the exhaust duct occupies the heating area and results in insufficient localized temperatures, avoiding residues caused by uneven softening of the silicone oil. It ensures that the PET substrate remains undeformed and undamaged, and the substrate after separation has high cleanliness and can be directly recycled, achieving efficient, clean, and stable resource recovery and significantly increasing its recycling value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the rapid cooling structure in this invention; Figure 3 This is a schematic diagram of the structure of a single upper hot plate in this invention; Figure 4 This is a schematic diagram of a half-section of a single upper hot press plate in this invention; Figure 5 This is a schematic diagram of the half-section structure of a single upper hot press plate in an inverted state in this invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A; Figure 7 This is a schematic diagram of the isolation frame structure in this invention; Figure 8 This is a schematic diagram of the separation structure of the compensation component in this invention; Figure 9 This is a schematic diagram of the arrangement structure of the scraping tentacles in this invention; Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point B.

[0022] Explanation of the labels in the diagram: 1. Hot-pressing main frame; 2. Lower hot-pressing plate; 3. Upper hot-pressing plate; 4. Pressure driving component; 5. Heating component; 6. Rapid cooling structure; 601. Cooling channel; 602. Circulating pump; 603. Coolant tank; 7. Delamination structure; 701. High-pressure air tank; 702. Blower; 8. Partitioning tank; 9. Isolation frame; 901. Hollow frame; 902. Thermosensitive deformation plate; 10. Exhaust trough; 11. Negative pressure micro-cavity; 12. Scraping edge; 121. Wind-receiving side; 122. Scraping edge side; 13. Compensating component; 131. Fixed side; 132. Extension frame; 133. Air port block; 14. Positioning frame. Detailed Implementation

[0023] like Figures 1 to 10As shown, this invention relates to a release film waste and silicone oil layer separation device based on hot pressing separation. It is designed for 125-250μm thick, single-sided rigid silicone PET release film waste. It achieves efficient separation of the silicone oil layer and substrate through differentiated temperature control and rapid cooling to induce cracking. The device includes a hot pressing main frame 1, a lower hot pressing plate 2 installed in the processing area of ​​the hot pressing main frame 1, a positioning frame 14 fixed to the top of the lower hot pressing plate 2, and an upper hot pressing plate 3 above the lower hot pressing plate 2. A driving force is connected to the center of the top of the upper hot pressing plate 3. Part 4, a mechanically driven scraper can be provided on one side of the lower hot press plate 2 or the upper hot press plate 3. Existing technology can be used here, which is not an improvement point of this application, so it will not be described in detail. Heating elements 5 are installed inside both the lower hot press plate 2 and the upper hot press plate 3. The heating temperature of the heating element 5 inside the upper hot press plate 3 is greater than that of the heating element 5 inside the lower hot press plate 2. A rapid cooling structure 6 is also provided on the lower hot press plate 2. When the rapid cooling structure 6 cools rapidly, the substrate of the release film waste and the silicone oil layer form an interface crack and delamination.

[0024] The rapid cooling structure 6 can be selected from various methods such as air cooling and water cooling depending on the situation. Here is a specific example: the rapid cooling structure 6 includes a cooling channel 601 that starts inside the lower hot platen 2. One interface of the cooling channel 601 is connected to a circulating pump 602, and the other interface of the circulating pump 602 is connected to a coolant tank 603. The coolant tank 603 is connected to the other interface of the cooling channel 601.

[0025] The upper hot press plate 3 is pressed into contact with the silicone layer. The heating temperature limit of the heating element 5 inside the upper hot press plate 3 is limited to 155-175℃, which can soften the silicone oil layer, cause severe thermal expansion, softening, and reduce the interface adhesion. The lower hot press plate 2 is in contact with the PET substrate of the release film waste. The heating temperature limit of the lower hot press plate 2 is limited to 120-140℃. The PET substrate part is only preheated, without softening or deformation. The rapid cooling structure 6 can rapidly cool the PET substrate to 25-40℃. The PET substrate shrinks rapidly, shrinks in size, and generates an inward pulling force. This causes the silicone oil layer to expand outward and the PET substrate to shrink inward, resulting in huge reverse stress at the interface. It automatically cracks, delaminates, and lifts up without hard cutting or damaging the substrate, achieving the interface separation effect.

[0026] Regarding the temperature control of heating element 5, a dual-path independent PID closed-loop temperature control method is adopted to adapt to the differentiated temperature control requirements of the upper and lower hot press plates. The accuracy is ±1℃, the response is fast, and overshoot is prevented. The system consists of: heating element 5, electric heating tubes embedded in the upper and lower hot press plates (power 2-5kW, high temperature resistant); temperature sensors, K-type thermocouples (180℃ high temperature resistant) are used on the upper plate (silicone oil side), and Pt100 thermal resistors (high accuracy) are used on the lower plate (substrate side); controller, dual-path PID temperature controller (such as Omron E5CC) with independent output; actuator, solid-state relay (SSR) to control the on and off of the heating element. In addition, other control methods can be selected according to the actual situation, such as PLC circuit control. The control methods are all achievable with existing technical means, so they will not be described in detail here.

[0027] The rapid cooling structure 6 achieves rapid cooling through the following method: A circulating pump 602 pumps coolant at a temperature of 5-15℃ from the coolant tank 603 into the cooling channel 601 inside the lower hot press plate 2 at a flow rate of 10-20 L / min. The cooling process lasts for 0.5-2 seconds. During this process, a temperature sensor (such as Pt100) installed inside the lower hot press plate 2 monitors its surface temperature in real time. When the detected temperature drops to a set threshold of 25-40℃, the circulating pump 602 stops or reduces its flow rate. The PET substrate (with a thermal expansion coefficient of approximately 7×10⁻⁶) -5 The temperature is rapidly cooled from approximately 130°C to approximately 30°C, resulting in a linear shrinkage strain of approximately 0.7%. Simultaneously, the upper hot platen 3 maintains the silicone oil layer at approximately 165°C (the thermal expansion coefficient of silicone oil is approximately 9 × 10⁻⁶). -4 The temperature difference of approximately 135°C causes a shear stress exceeding 1 MPa at the interface between the silicone oil layer and the PET substrate (this value is calculated based on the difference in thermal expansion coefficients, elastic modulus, and temperature difference between the two materials). This stress exceeds the interfacial bonding force between typical cross-linked silicone oil and the PET substrate (approximately 0.5-0.8 MPa), thereby causing microcracks to automatically form and propagate at the interface, achieving pre-crack delamination.

[0028] Working principle: Single-sided silicone rigid release film waste is laid flat on the lower hot press plate 2 and fixed by the positioning frame 14 to ensure that the film surface is flat and without warping. The driving component 4 drives the upper hot press plate 3 to press down and adhere the waste. The heating components 5 in the upper and lower hot press plates independently control the temperature. The upper hot press plate 3 is heated to 155-175℃, which fully softens the cross-linked silicone oil layer and causes it to expand rapidly, greatly reducing the interfacial adhesion. The lower hot press plate 2 is heated to 120-140℃, which only preheats the substrate to avoid softening and deformation of PET and maintain high stiffness. After heating is completed, the film is quickly... When the cold structure 6 is activated, the coolant in the coolant tank 603 is circulated into the cooling channel 601 of the lower hot press plate 2 via the circulation pump 602. Within 0.5-2 seconds, the PET substrate is rapidly cooled to 25-40℃. The PET substrate shrinks rapidly (shrinkage rate 0.3%-0.5%), forming a reverse thermal stress with the high-temperature thermally expanding silicone oil layer. The interface automatically cracks and the edges lift up, without the need for mechanical hard cutting, and without damaging the PET substrate. After the interface is delaminated, the silicone oil layer is scraped off with a scraper, thereby achieving a better silicone oil layer removal effect.

[0029] Furthermore, relying solely on differentiated temperature control and rapid cooling to induce interfacial delamination may still result in insufficient delamination, localized adhesion between the silicone oil layer and the substrate, and incomplete cleaning in some areas. To address this, the upper hot press plate 3 is equipped with a delamination structure 7. This structure includes high-pressure air channels 701 located inside the four sides of the upper hot press plate 3. Each high-pressure air channel 701 is a rectangular bent channel with a cross-section of 1mm × 2mm. Its outlet is located on the side of the upper hot press plate 3 near the bottom edge, and the outlet plane forms a 45° angle with the bottom surface of the upper hot press plate 3. The lower edge of the outlet is flush with or slightly lower than the bottom surface of the upper hot press plate 3 by 0.1-0.3 mm. The high-pressure air groove 701 is connected to the blower 702 through an internal pipe. The blower 702 can provide a stable air pressure of 0.2-0.5 MPa and an air flow rate of 30-50 L / min. When the upper hot press plate 3 is slightly raised by 0.5-2 mm after the interface is pre-cracked, the high-pressure airflow is blown out from the outlet at a 45° angle downwards. It can wedge into the cracked interface gap. The airflow impact force acts on both sides of the gap, generating about 5-15 N / m. 2 The peeling pressure helps to expand the separation gap.

[0030] Working principle: After the initial cracking of the interface is completed by thermal expansion and contraction, blower 702 is started. Blower 702 draws in gas and pressurizes it through high-pressure air tank 701. The high-pressure airflow is blown directionally into the micro gap between the silicone oil layer and the PET substrate from the inclined outlet. The airflow acts directly on the cracked interface, and the gas impact force is used to further open the micro cracks, expand the separation gap, and enhance the interface separation effect. The directional high-pressure airflow assists in crack expansion, so that the local incompletely separated areas are completely debonded, creating sufficient stratification conditions for the subsequent scraping process, avoiding residual adhesion, and improving the overall cleaning cleanliness.

[0031] Furthermore, although the high-pressure airflow ejected from the high-pressure air trough 701 can assist in stratification, the airflow converges towards the center, easily forming turbulence and local disturbances, weakening the stratification effect. To address this, a partitioning groove 8 is provided at the bottom of the upper hot press plate 3. The partitioning groove 8 is rectangular in shape, and an isolation frame 9 is installed inside the partitioning groove 8. The isolation frame 9 includes a hollow frame 901, which is made of an elastic material and has a curved cross-section. The four sides inside the hollow frame 901 are equipped with heat-sensitive deformation plates 902, which are made of a material that can deform when heated. Four exhaust grooves 10 are also provided at the bottom of the upper hot press plate 3 in the area outside the partitioning groove 8. The exhaust grooves 10 penetrate the upper hot press plate 3 to guide the high-pressure airflow out.

[0032] The thermosensitive deformation plate 902 can be made of shape memory alloy (such as nitinol) or bimetallic sheet, with an austenitic phase transformation completion temperature Af of 145℃±2℃. Four thermosensitive deformation plates 902 are fixed inside the hollow frame 901 via slots. Initially (martensitic), they are flat. When the temperature of the upper hot plate 3 rises above 145℃, the thermosensitive deformation plate 902 completes its austenitic phase transformation. Different shape memory alloy materials can be selected depending on the specific material being used. When the temperature of the upper hot plate 3 rises to this range... When heated, the heat-sensitive deformation plate 902 bends and deforms by 2-5mm. This deformation pushes the elastic wall of the hollow frame 901 to expand outward, so that its outer edge fits tightly against the inner wall of the partition groove 8, thereby forming an airtight or quasi-airtight circumferential isolation barrier, separating the gap between the upper hot press plate 3 and the release film into an inner layering area and an outer exhaust area. The deformation process time of the heat-sensitive deformation plate 902 (including the heat conduction time) is sufficient to heat the silicone oil layer to the required temperature, so that it will not affect the layering during the heating process.

[0033] Working principle: After hot pressing is completed and the interface is initially cracked, the driving component 4 drives the upper hot pressing plate 3 to be slightly raised, so that a small gap is formed between the upper hot pressing plate 3 and the release film. Then, the heating temperature is appropriately increased, and the heat is conducted to the heat-sensitive deformation plate 902, which is heated and extends outward, causing the hollow frame 901 to stretch and unfold. The unfolded isolation frame 9 forms a circumferential isolation barrier in the partition groove 8. The hollow frame 901 has low elasticity and will not affect the delamination. The gap is divided into an inner delamination area and an outer exhaust area. The directional airflow ejected from the high-pressure air groove 701 is blocked by the isolation frame 9 and limited to the inner delamination area, which concentrates on the interface between the silicone oil and the substrate. The outer airflow is smoothly discharged through the exhaust groove 10, forming a directional flow loop, which effectively suppresses turbulence and ensures that the airflow acts stably on the interface, further enhancing the delamination effect and avoiding silicone oil re-adhesion or residue caused by airflow disturbance.

[0034] Furthermore, although the airflow turbulence is avoided by the cooperation of the isolation frame 9 and the exhaust groove 10, the silicone oil layer in the center area of ​​the release film still lacks a structure that directly assists in the layering. The interface cracking degree at the center is relatively weak, and local adhesion is likely to occur. To address this issue, multiple negative pressure microcavities 11 are provided at the bottom of the upper hot press plate 3 near the inner side of the partition groove 8. The negative pressure microcavities 11 are connected to the exhaust groove 10. The diameter of the negative pressure microcavities 11 is smaller than that of the exhaust groove 10. When the high-speed airflow from the exhaust groove 10 is discharged, the negative pressure microcavities 11 form negative pressure.

[0035] In a preferred embodiment, the negative pressure microcavity 11 is a blind hole with a diameter of 0.5-1 mm. Its inlet is connected to the side wall of the exhaust groove 10 through a tapering throat. The diameter of the narrowest part of the throat is one-third or one-half of the diameter of the negative pressure microcavity 11. The cross-sectional area of ​​the exhaust groove 10 is 20-50 times that of the negative pressure microcavity 11. When the blower 702 operates and the airflow velocity in the exhaust groove 10 reaches 50-80 m / s, according to the Bernoulli principle and Venturi effect of fluid mechanics, a stable negative pressure (vacuum) of -5 kPa to -15 kPa can be generated at the inlet of the negative pressure microcavity 11. This negative pressure acts on the silicone oil layer in the center of the release film through the inlet of the negative pressure microcavity 11, generating an upward suction force on it.

[0036] Specific embodiment: When the blower 702 operates, causing the airflow velocity in the exhaust duct 10 to reach 60 m / s, according to Bernoulli's equation and the Venturi effect, a stable negative pressure (vacuum) of approximately -10 kPa can be generated at the throat inlet of the negative pressure microcavity 11. The specific calculation basis is: P1 + 1 / 2ρv1 2 =P2+1 / 2ρv2 2 Where P1 is the static pressure in the exhaust channel, v1 is the flow velocity in the exhaust channel (60 m / s), P2 is the static pressure at the throat (i.e., the pressure in the negative pressure microcavity), v2 is the flow velocity at the throat (calculated from the continuity equation A1v1=A2v2, approximately 300 m / s), and ρ is the air density (1.2 kg / m³). 3 Substituting this into the calculation, we can obtain that P2 is approximately -10 kPa.

[0037] Working principle: After hot pressing is completed and the driving component 4 is slightly raised, the high-pressure airflow is ejected from the high-pressure air groove 701, guided into the exhaust groove 10 through the outside of the isolation frame 9 and discharged at high speed; according to the Venturi principle, when the high-speed airflow flows through the exhaust groove 10, a stable negative pressure is formed inside the small-diameter negative pressure microcavity 11 connected to its side; this negative pressure directly acts on the silicone oil layer in the central area of ​​the release film, generating a uniform upward suction force on the softened silicone oil layer in the center, actively pulling the central interface, promoting the propagation of microcracks, making up for the defect of insufficient delamination in the central area, realizing synchronous delamination between the center and the edge, further strengthening the overall delamination effect, and ensuring uniform delamination of the silicone oil layer throughout the entire area.

[0038] Furthermore, although the layering is enhanced by airflow assistance and negative pressure suction, the edge area of ​​the release film is still prone to problems such as local adhesion of silicone oil and insufficient edge lifting. To address this, the upper hot press plate 3 is positioned near the edge area of ​​the release film and has multiple elastic curved scraping edges 12 arranged in a rectangular array. The scraping edges 12 are made of an elastic material and are curved in shape. The scraping edges 12 include a wind-receiving side 121 and a scraping side 122. The wind-receiving side 121 is subjected to the wind force of the high-pressure air groove 701, which causes the scraping side 122 to scrape the edge of the release film waste.

[0039] In a preferred embodiment, the scraping tip 12 is made of polyurethane or silicone rubber with a Shore hardness of A50-70. Its root is fixed in the mounting hole at the bottom of the upper hot press plate 3, and its free end extends towards the edge of the release film. The wind-receiving side 121 is a concave surface with a large area, facing the direction of the incoming flow of the high-pressure air groove 701. The scraping side 122 is a thin blade-shaped structure with a tip thickness of 0.1-0.3mm. When a high-pressure airflow of 0.2-0.5MPa acts on the wind-receiving side 121, it generates a thrust of 0.01-0.05N, causing the free end of the scraping tip 12 to undergo an elastic deflection of 5°-15°. This allows the blade of the scraping side 122 to contact and scrape the silicone oil layer that has been lifted off the edge of the release film with a linear pressure of 0.5-2N / m.

[0040] Working principle: After hot pressing is completed and the driving component 4 is slightly raised, the high-pressure airflow ejected from the high-pressure air groove 701 blows towards the edge area, directly acting on the wind-receiving side 121 of the scraping edge antenna 12; the scraping edge antenna 12 swings directionally under the force of the wind, causing the scraping edge side 122 to press down and scrape the edge of the release film; the scraping edge side 122 then scrapes and lifts the silicone oil layer that has initially cracked at the edge, further expanding the edge separation gap, strengthening the edge delamination effect, preventing silicone oil residue at the edge, and achieving simultaneous and sufficient delamination between the edge and the center, providing a reliable foundation for subsequent complete peeling.

[0041] Furthermore, the aforementioned exhaust channel 10 provides a return channel, but it occupies the heating area, causing insufficient local heating and uneven softening of silicone oil. To address this, a compensation component 13 is installed on the bottom wall side of the exhaust channel 10. The compensation component 13 includes a fixed edge 131 fixed to the bottom wall, with multiple air ports on the fixed edge 131. A hollow frame-shaped extension frame 132 is provided on one side of the fixed edge 131, and an air port block 133 adapted to the air ports is connected to the inner circumference of the extension frame 132. The fixed edge 131 and the air port block 133 are made of metal, which can achieve heat conduction and ensure that the heating area is not reduced.

[0042] The compensation component 13 includes a fixed edge 131 fixed to the bottom wall of the exhaust channel 10. Multiple air ports are provided on the fixed edge 131. A hollow frame-shaped extension frame 132 is provided on one side of the fixed edge 131. The extension frame 132 is a U-shaped hollow frame sliding bracket fixed to the side wall of the exhaust channel 10. The extension frame 132 can slide in a direction perpendicular to the fixed edge 131 by cooperating with the side walls of the exhaust channel 10 on both sides. An air port block 133 adapted to the air ports is connected to the inner circumference of the extension frame 132. The air port block 133 is fixedly connected to the side of the extension frame 132 facing the fixed edge 131. Preferably, the extension frame 132... A return spring (such as a compression spring) can be connected between the sliding bracket and the air port, or the air port can be closed by gravity. During the heating stage, under the action of the return spring (the preload of the spring is set to 0.06MPa equivalent thrust), the air port block 133 tightly fits against the fixed edge 131, sealing the air port. During the airflow stage, when the pressure of the high-pressure airflow exceeds the spring preload (e.g., >0.05MPa), it pushes the extension frame 132 together with the air port block 133 to slide against the spring force, opening the air port. After the airflow stops, under the action of the return spring, the extension frame 132 and the air port block 133 automatically reset and re-close the air port.

[0043] Working principle: During the normal heating stage, the air vent block 133 and the air vent of the fixed edge 131 are closed. The metal fixed edge 131 is in contact with the air vent block 133 to form a continuous heat-conducting surface, which completely compensates for the heating area occupied by the exhaust groove 10, ensuring that the upper hot plate 3 is heated evenly and the silicone oil layer softens uniformly. When the airflow returns, the high-pressure airflow flows through the exhaust groove 10, blowing the air vent block 133 to move outward along the extension frame 132, opening the air vent and forming a return air passage to achieve smooth airflow guidance and discharge. After the airflow stops, the extension frame 132 automatically resets under gravity, and the air vent block 133 closes again, restoring complete heat conduction compensation and taking into account both heating uniformity and airflow guidance function.

[0044] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A release film waste and silicone oil layer separation device based on hot pressing separation, comprising a hot pressing main frame (1), a lower hot pressing plate (2) is installed in the processing area of the hot pressing main frame (1), an upper hot pressing plate (3) is arranged above the lower hot pressing plate (2), and a driving pressing piece (4) is connected to the top center of the upper hot pressing plate (3), characterized in that, Heating elements (5) are installed inside both the lower hot press plate (2) and the upper hot press plate (3). The heating temperature of the heating element (5) inside the upper hot press plate (3) is greater than that of the heating element (5) inside the lower hot press plate (2). A rapid cooling structure (6) is also provided on the lower hot press plate (2). When the rapid cooling structure (6) cools rapidly, the substrate of the release film waste and the silicone oil layer form an interface crack and delamination. The upper hot press plate (3) is provided with a delamination structure (7). The delamination structure (7) includes high pressure air grooves (701) opened on the four sides of the upper hot press plate (3). The high pressure air grooves (701) are bent structures. The outlet of the high pressure air grooves (701) is inclined towards the processing release film. The high pressure air grooves (701) are connected to a blower (702).

2. The apparatus for separating the waste of the release film from the layer of silicone oil based on hot pressing separation according to claim 1, characterized in that, The rapid cooling structure (6) includes a cooling channel (601) starting inside the lower hot platen (2), one interface of the cooling channel (601) is connected to a circulating pump (602), the other interface of the circulating pump (602) is connected to a coolant tank (603), and the coolant tank (603) is connected to the other interface of the cooling channel (601).

3. A release film waste and silicone oil layer separation device based on hot-pressing separation according to claim 1 or 2, characterized in that, The upper hot plate (3) has a partition groove (8) at the bottom. The partition groove (8) is rectangular in shape and an isolation frame (9) is installed inside the partition groove (8).

4. The device for separating release film waste and silicone oil layer based on hot pressing separation according to claim 3, characterized in that, The isolation frame (9) includes a hollow frame (901), which is made of an elastic material. The hollow frame (901) has a curved cross-section. The four sides inside the hollow frame (901) are equipped with heat-sensitive deformation plates (902), which are made of a material that can be deformed by heat.

5. The release film waste and silicone oil layer separation device based on hot-pressing separation according to claim 4, characterized in that, The bottom of the upper hot plate (3) is provided with four exhaust grooves (10) in the area outside the partition groove (8). The exhaust grooves (10) pass through the upper hot plate (3) to guide the high-pressure airflow out.

6. The device for separating release film waste and silicone oil layer based on hot-pressing separation according to claim 5, characterized in that, The bottom of the upper hot platen (3) near the inner side of the partition groove (8) has multiple negative pressure microcavities (11). The negative pressure microcavities (11) are connected to the exhaust groove (10). The diameter of the negative pressure microcavities (11) is smaller than that of the exhaust groove (10). When the high-speed airflow is discharged from the exhaust groove (10), the negative pressure microcavities (11) form negative pressure.

7. The release film waste and silicone oil layer separation device based on hot-pressing separation according to claim 6, characterized in that, The upper hot press plate (3) is provided with multiple scraping tentacles (12) near the edge area of ​​the release film waste, and the multiple scraping tentacles (12) are arranged in a rectangular array.

8. The release film waste and silicone oil layer separation device based on hot-pressing separation according to claim 7, characterized in that, The scraping antenna (12) is made of an elastic material. The scraping antenna (12) is curved in the whole. The scraping antenna (12) includes a wind-receiving side (121) and a scraping side (122). The wind-receiving side (121) is subjected to the wind force of the high-pressure air tank (701) so that the scraping side (122) scrapes the edge of the release film waste.

9. The device for separating release film waste and silicone oil layer based on hot pressing separation according to claim 8, characterized in that, The exhaust trough (10) is equipped with a compensation component (13) on the bottom wall side. The compensation component (13) includes a fixed side (131) fixed to the bottom wall. Multiple air ports are provided on the fixed side (131). A hollow frame-shaped extension frame (132) is provided on one side of the fixed side (131). An air port block (133) adapted to the air port is connected to the inner circumference of the extension frame (132).

10. The device for separating release film waste and silicone oil layer based on hot-pressing separation according to claim 9, characterized in that, The lower hot platen (2) is fixed with a positioning frame (14) on top.

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