A low-temperature solvent-free composite device for easily degradable high-barrier membranes

Abstract

This invention discloses a low-temperature solvent-free lamination device for easily degradable high-barrier films. A lower pressure roller is rotatably mounted on the mounting frame, and a pressure adjustment mechanism is also mounted on the mounting frame. The pressure adjustment mechanism rotatably mounts an upper pressure roller via an adjustment structure. The upper pressure roller is parallel to and directly above the lower pressure roller. Two layers of substrate, coated by the low-temperature coating unit, enter the area between the upper and lower pressure rollers for lamination. The lower pressure roller contacts the moving substrate surface and passively rotates due to the friction between the substrate and the roller surface. The rotation speed of the lower pressure roller is proportional to the moving speed of the substrate. The rotation of the lower pressure roller is transmitted to the pressure adjustment mechanism, which adjusts the lamination pressure of the upper pressure roller on the substrate in real time according to the rotation speed of the lower pressure roller. The mounting frame is also equipped with a steady-state positioning structure for stabilizing the position of the upper pressure roller, which can automatically adjust the lamination pressure between the upper and lower pressure rollers in real time according to the film running speed.

Description

Technical Field

[0001] This invention relates to the field of membrane composite processing equipment, and more particularly to a low-temperature solvent-free composite device for easily degradable high-barrier membranes. Background Technology

[0002] Biodegradable high-barrier films are widely used in food packaging, daily chemical packaging, and fresh food preservation due to their environmental friendliness, biodegradability, and excellent barrier properties. In actual production, these films often require a lamination process to bond two or more substrates together to further improve their overall performance. Currently, the mainstream process in the industry is solvent-free lamination. Traditional solvent-free lamination equipment often uses conventional high-temperature coating and high-temperature curing methods, and the pressing mechanism is mostly a fixed gap and fixed pressure structure. However, biodegradable high-barrier films have special materials and poor high-temperature resistance. High-temperature environments can easily cause film shrinkage, deformation, premature degradation, and damage to mechanical properties, seriously affecting the quality of the finished product. Therefore, conventional high-temperature lamination equipment cannot meet the production requirements of this type of film. In existing low-temperature solvent-free lamination devices, the lamination pressure of the pressing rollers is mostly manually preset and fixed, and the pressure cannot be dynamically adjusted according to the substrate conveying speed during equipment operation.

[0003] Thin film lamination production involves several typical operating conditions, including startup speed increase, shutdown speed decrease, and roll change speed variation. The equipment speed is constantly changing, and the film and adhesive layer are in a non-steady-state condition for a long time. During startup, the equipment gradually increases from zero speed to the set production speed, with the speed increasing continuously. If the lamination pressure is too high in the low-speed range, it is easy to stretch and tear the soft and easily degradable film. When running at high speed, the pressure is too low to ensure that the adhesive fully wets the substrate, resulting in poor lamination. During shutdown speed decrease, the equipment gradually decreases from high production speed to zero speed, with the speed continuously falling. Fixed pressure can also cause problems such as film damage and bonding defects. In addition, when unwinding and rewinding the material roll during production, the equipment needs to frequently decrease from the normal production speed to low speed, and then increase back to the standard speed after the roll change is completed. This kind of short-term speed change occurs frequently, and the fixed pressure mode is difficult to match the changing operating conditions. Summary of the Invention

[0004] The present invention proposes a low-temperature solvent-free composite device for easily degradable high-barrier membranes, which solves the problem that the composite pressure cannot be automatically adjusted with speed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-temperature solvent-free laminating device for easily degradable high-barrier films includes an unwinding unit with two unwinding rollers for unwinding a first substrate and a second substrate, respectively. A low-temperature coating unit, a low-temperature curing unit, and a rewinding unit are sequentially arranged on the right side of the unwinding unit. The device is characterized by two symmetrically distributed mounting frames between the low-temperature coating unit and the low-temperature curing unit. A lower pressure roller is rotatably mounted on each mounting frame, and a pressure adjustment mechanism is also mounted on the mounting frame. An upper pressure roller is rotatably mounted on the pressure adjustment mechanism via an adjustment structure. The upper pressure roller is parallel to and directly above the lower pressure roller. The two substrate layers, after being coated by the low-temperature coating unit, enter the area between the upper and lower pressure rollers for lamination. The lower pressure roller contacts the moving substrate surface and passively rotates due to friction between the substrate and the roller surface. The rotational speed of the lower pressure roller is proportional to the moving speed of the substrate. The rotation of the lower pressure roller is transmitted to the pressure adjustment mechanism, which adjusts the lamination pressure of the upper pressure roller on the substrate in real time according to the rotational speed of the lower pressure roller. The mounting frame also has a stable positioning structure for stabilizing the position of the upper pressure roller.

[0006] Preferably, the pressure adjustment mechanism includes a lifting screw rotatably mounted inside the mounting frame via a mounting shaft seat. A lifting rail is also mounted inside the mounting frame. A lifting screw seat is slidably mounted on the lifting rail. The lifting screw seat is threadedly connected to the lifting screw. A strong coil spring is mounted on the upper end of the lifting screw. A transmission component is mounted on the bottom end of the lifting screw. The transmission component is connected to the lower pressure roller for transmission. Upper limit and lower limit blocks are respectively provided at the upper and lower ends of the lifting rail.

[0007] Preferably, the upper end of the lifting screw is equipped with two sets of vertically distributed mounting bearings, and the high-strength coil spring is sleeved on the lifting screw portion located between the two mounting bearings. The inner ring end of the high-strength coil spring is connected to the lifting screw, and one end of the outer ring of the high-strength coil spring is fixed to the mounting bearing. When the substrate moving speed is lower than the set threshold, the transmission component will not drive the lifting screw. The strong coil spring can overcome the weight of the upper pressure roller and the friction of the guide rail, drive the lifting screw to rotate in the opposite direction, and make the lifting screw seat rise to the upper limit position. The upper pressure roller then moves up to reduce the pressure on the substrate.

[0008] Preferably, the transmission component includes a one-way centrifugal clutch fixed to the bottom end of the lower mounting shaft seat. The output end of the one-way centrifugal clutch is connected to the bottom end of the lifting screw. The input end of the one-way centrifugal clutch is connected to a connecting shaft. A driven bevel gear is installed at the lower end of the connecting shaft. A driving bevel gear is installed on the lower pressure roller. The driving bevel gear meshes with the driven bevel gear.

[0009] Preferably, the adjustment structure includes a fixed frame fixed above the lifting screw seat. The fixed frame has threaded holes extending through it vertically. An adjusting screw is threaded into the threaded holes. The bottom end of the adjusting screw is located below the fixed frame, and the lower end of the adjusting screw is rotatably connected to a lifting shaft seat. The surface of the lifting shaft seat slides in contact with the side wall of the fixed frame. By rotating the adjusting screw, the lifting shaft seat can be moved up and down, thereby allowing manual fine-tuning of the initial height of the upper pressure roller as needed.

[0010] Preferably, the steady-state positioning structure includes a fixing plate fixed to the inner wall of the mounting frame, a mounting sleeve fixed to the side of the lifting screw seat, and a positioning component for connecting and positioning with the fixing plate fixed inside the mounting sleeve.

[0011] Preferably, the mounting sleeve has a hollow interior with a telescopic groove. The positioning component includes a telescopic block that slides into the telescopic groove. Both the telescopic block and the telescopic groove have a convex cross-section. A steel ball is rolled and embedded in the end of the telescopic block facing the fixed plate. A lifting spring is placed in the telescopic groove. The two ends of the lifting spring abut against the inner wall of the telescopic block and the telescopic groove, respectively. The lifting spring causes the telescopic block to always have a tendency to move towards the fixed plate.

[0012] Preferably, the fixing plate has an upper slot and a lower slot sequentially formed from top to bottom. Both the upper slot and the lower slot are V-shaped slots, and the inclination angle of the upper slot is smaller than that of the lower slot.

[0013] The beneficial effects of this invention are: 1. This invention utilizes the rotation of the lower pressure roller as it travels with the film, combined with the linkage of a one-way centrifugal clutch, a lifting screw, and a powerful coil spring. This allows for real-time and automatic adjustment of the composite pressure between the upper and lower pressure rollers based on the film's running speed. It perfectly adapts to various unsteady operating conditions during production, such as speed increases during startup, speed decreases during shutdown, and frequent speed changes during roll changes. During low-speed operation, the device automatically reduces the composite pressure, effectively preventing easily degradable films from being stretched, wrinkled, or even damaged, thus protecting the original properties of the substrate. When the film conveying speed increases to the normal production range or high-speed conditions, the device simultaneously increases the composite pressure, ensuring the adhesive layer fully wets both substrate layers, improving the composite bonding strength, and preventing quality problems such as delamination and loose bonding.

[0014] 2. This invention, by setting a stable positioning structure, and with the cooperation of steel balls, lifting springs and V-grooves of different inclination angles on the fixed plate, can form a stable bistable limit for the upper pressure roller, effectively offsetting the positional deviation caused by equipment operation vibration and film conveying jitter, keeping the composite pressure uniform and stable, reducing defects such as bubbles and misalignment on the composite surface, and greatly improving the finished product qualification rate. Attached Figure Description

[0015] Figure 1This is a front view of a low-temperature solvent-free composite device for easily degradable high-barrier membranes proposed in this invention; Figure 2 for Figure 1 A schematic diagram of the middle mounting frame, upper and lower pressure rollers, and pressure adjustment mechanism; Figure 3 for Figure 2 A schematic diagram of the upper and lower pressure rollers and the pressure adjustment mechanism; Figure 4 for Figure 3 A schematic diagram of the medium pressure adjustment mechanism and the steady-state positioning structure; Figure 5 for Figure 4 Exploded view of the pressure adjustment mechanism; Figure 6 for Figure 2 A magnified view of a portion of the image; Figure 7 A schematic diagram of the steady-state positioning structure and the lifting screw seat; Figure 8 This is an exploded view of the steady-state positioning structure.

[0016] Numbering on the map: 1. Unwinding unit; 2. Low-temperature coating unit; 3. Low-temperature curing unit; 4. Rewinding unit; 5. Mounting bracket; 6. Lower pressure roller; 61. Driven bevel gear; 7. Pressure adjustment mechanism; 71. Lifting screw; 711. Mounting shaft seat; 72. Lifting screw seat; 721. Lifting rail; 73. High-strength coil spring; 74. One-way centrifugal clutch; 741. Connecting shaft; 75. Driven bevel gear; 8. Upper pressure roller; 81. Adjustment structure; 82. Fixing frame; 83. Adjusting screw; 84. Lifting shaft seat; 9. Steady-state positioning structure; 91. Fixing plate; 911. Upper slot; 912. Lower slot; 92. Mounting sleeve; 93. Positioning component; 931. Telescopic block; 932. Steel ball; 933. Lifting spring. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Reference Figure 1 - Figure 8A low-temperature solvent-free laminating device for easily degradable high-barrier films includes an unwinding unit 1 with two unwinding rollers for unwinding a first substrate and a second substrate, respectively. A low-temperature coating unit 2, a low-temperature curing unit 3, and a rewinding unit 4 are sequentially arranged on the right side of the unwinding unit 1. The device is characterized by having two symmetrically distributed mounting frames 5 between the low-temperature coating unit 2 and the low-temperature curing unit 3. A lower pressure roller 6 is rotatably mounted on each mounting frame 5. A pressure adjustment mechanism 7 is also mounted on each mounting frame 5, and the pressure adjustment mechanism 7 is rotatably mounted on an upper pressure roller via an adjustment structure 81. The upper pressure roller 8 is arranged parallel to the lower pressure roller 6 directly above it. The two layers of substrate, after being coated by the low-temperature coating unit 2, enter the area between the upper pressure roller 8 and the lower pressure roller 6 for lamination. The lower pressure roller 6 contacts the moving substrate surface and rotates passively by the friction between the substrate and the roller surface. The rotation speed of the lower pressure roller 6 is proportional to the moving speed of the substrate. The rotation of the lower pressure roller 6 is transmitted to the pressure adjustment mechanism 7. The pressure adjustment mechanism 7 adjusts the lamination pressure of the upper pressure roller 8 on the substrate in real time according to the rotation speed of the lower pressure roller 6. The mounting frame 5 is also provided with a stable positioning structure 9 for stabilizing the position of the upper pressure roller 8.

[0019] Reference Figure 3 - Figure 5 The pressure adjustment mechanism 7 includes a lifting screw 71 rotatably mounted inside the mounting frame 5 via a mounting shaft seat 711. A lifting rail 721 is also mounted inside the mounting frame 5. A lifting screw seat 72 is slidably mounted on the lifting rail 721. The lifting screw seat 72 is threadedly connected to the lifting screw 71. A strong coil spring 73 is mounted on the upper end of the lifting screw 71. A transmission component is mounted on the bottom end of the lifting screw 71. The transmission component is connected to the lower pressure roller 6 for transmission. Upper limit and lower limit baffles are respectively provided at the upper and lower ends of the lifting rail 721.

[0020] Reference Figure 4 The upper end of the lifting screw 71 is equipped with two sets of vertically distributed mounting bearings 711. The high-strength coil spring 73 is sleeved on the part of the lifting screw 71 located between the two mounting bearings 711. The inner ring end of the high-strength coil spring 73 is connected to the lifting screw 71, and one end of the outer ring of the high-strength coil spring 73 is fixed to the mounting bearing 711. When the substrate moving speed is lower than the set threshold, that is, when the speed of the lower pressure roller 6 is lower than the minimum threshold of the normally set speed, the transmission component will not drive the lifting screw 71. The strong coil spring 73 can overcome the weight of the upper pressure roller 8 and the friction of the guide rail, drive the lifting screw 71 to rotate in the opposite direction, so that the lifting screw seat 72 rises to the upper limit position, and the upper pressure roller 8 moves up to reduce the pressure on the substrate.

[0021] Reference Figure 5The transmission component includes a one-way centrifugal clutch 74 fixed to the bottom end of the lower mounting seat 711. The output end of the one-way centrifugal clutch 74 is connected to the bottom end of the lifting screw 71. The input end of the one-way centrifugal clutch 74 is connected to a connecting shaft 741. A driven bevel gear 75 is mounted on the lower end of the connecting shaft 741. A driving bevel gear 61 is mounted on the lower pressure roller 6. The driving bevel gear 61 meshes with the driven bevel gear 75. When the substrate moving speed exceeds the set threshold range, the one-way centrifugal clutch 74 engages, the lower pressure roller 6 drives the lifting screw 71 to rotate forward, overcoming the torque of the strong coil spring 73, the lifting screw seat 72 drives the upper pressure roller 8 to descend, and with the set steady-state positioning structure 9, the upper pressure roller 8 is in a stable position, applying stable pressure to the substrate. When the substrate moving speed exceeds the set threshold, the one-way centrifugal clutch 74 engages, and the lower pressure roller 6 drives the lifting screw 71 to rotate forward, overcoming the torque of the strong coil spring 73. The lifting screw seat 72 drives the upper pressure roller 8 to descend to the low position until it touches the lower limit stop block. At this time, the one-way centrifugal clutch 74 continues to rotate but is blocked by the limit, resulting in a brief slippage. When the speed decreases, the one-way centrifugal clutch 74 disengages, and the coil spring drives the screw to reverse again, and the upper pressure roller 8 rises back.

[0022] Reference Figure 4 The adjustment structure 81 includes a fixed frame 82 fixed above the lifting screw seat 72. The fixed frame 82 has threaded holes extending through it vertically. An adjusting screw 83 is threaded into the threaded holes. The bottom end of the adjusting screw 83 is located below the fixed frame 82, and the lower end of the adjusting screw 83 is rotatably connected to a lifting shaft seat 84. The surface of the lifting shaft seat 84 slides in contact with the side wall of the fixed frame 82. By rotating the adjusting screw 83, the lifting shaft seat 84 can be moved up and down, thereby allowing manual fine-tuning of the initial height of the upper pressure roller 8 as needed.

[0023] Reference Figure 6 - Figure 8 The steady-state positioning structure 9 includes a fixing plate 91 fixed on the inner side wall of the mounting frame 5, a mounting sleeve 92 fixed on the side of the lifting screw seat 72, and a positioning element 93 for connecting and positioning with the fixing plate 91 fixed inside the mounting sleeve 92.

[0024] Reference Figure 8The mounting sleeve 92 has a hollow interior with a telescopic groove. The positioning component 93 includes a telescopic block 931 that slides into the telescopic groove. Both the telescopic block 931 and the telescopic groove have a convex cross-section. A steel ball 932 is rolled and embedded in the end of the telescopic block 931 facing the fixed plate 91. A lifting spring 933 is placed in the telescopic groove. The two ends of the lifting spring 933 abut against the telescopic block 931 and the inner wall of the telescopic groove, respectively. The lifting spring 933 makes the telescopic block 931 always tend to move towards the fixed plate 91.

[0025] Reference Figure 8 The fixing plate 91 has an upper groove 911 and a lower groove 912 sequentially formed from top to bottom. Both the upper groove 911 and the lower groove 912 are V-shaped grooves. The inclined angle of the upper groove 911 is smaller than that of the lower groove 912. When the substrate moving speed is higher than the set threshold range, the one-way centrifugal clutch 74 engages. At this time, the one-way centrifugal clutch 74 is in the engaged state, but the rotation speed makes the spring force inside the one-way centrifugal clutch 74 not greater than the spring force of the lifting spring 933. The one-way centrifugal clutch 74 does not have enough force to drive the lifting screw seat 72 to move upward so that the steel ball 932 disengages from the lower slot 912. When the substrate moving speed is lower than the set threshold, the one-way centrifugal clutch 74 disengages, and the lower pressure roller 6 will not drive the lifting screw 71 to rotate. The strong coil spring 73 can overcome the weight of the upper pressure roller 8 and the friction of the guide rail, and drive the lifting screw 71 to rotate in the opposite direction, so that the lifting screw seat 72 rises to the upper limit position. The steel ball 932 can compress the lifting spring 933, so that the steel ball 932 moves along the inclined surface of the lower groove 912 to the top and is in the upper groove 911. The setting of the upper groove 911 ensures that under normal vibration conditions, the device will not cause the upper pressure roller 8 to shake up and down, thus improving stability. When the substrate moving speed is within the set range, the spring force built into the one-way centrifugal clutch 74 can only make the steel ball 932 overcome the inclined surface of the upper slot 911, but cannot overcome the inclined surface of the lower slot 912. That is, it can only move from the upper slot 911 into the lower slot 912, but cannot disengage from the lower slot 912.

[0026] Working principle: When the device is working, the two unwinding rollers of the unwinding unit 1 release the first substrate and the second substrate respectively. After the first substrate enters the low temperature coating unit 2 and is coated with solvent-free adhesive, it enters the mounting frame 5 together with the second substrate between the upper pressure roller 8 and the lower pressure roller 6. The lower pressure roller 6 contacts the moving substrate surface and is passively rotated by the friction between the substrate and the roller surface. Its rotation speed is proportional to the moving speed of the substrate. The driving bevel gear 61 at the shaft end of the lower pressure roller 6 transmits the rotational power to the one-way centrifugal clutch 74 through the meshing driven bevel gear 75 and the connecting shaft 741.

[0027] When the substrate moving speed is within the set threshold range, although the one-way centrifugal clutch 74 is engaged, the driving force transmitted by the clutch is insufficient to drive the steel ball 932 out of the V-shaped lower slot 912 where it is currently located, because the rotation speed has not reached a level sufficient to overcome the elastic force of the lifting spring 933 in the steady-state positioning structure 9, thus ensuring the stability of the composite pressure and the reliability of the equipment.

[0028] When the substrate moving speed is lower than the set lower threshold, the one-way centrifugal clutch 74 is in a fully disengaged state and does not transmit driving torque to the lifting screw 71. At this time, the strong coil spring 73 sleeved on the lifting screw 71 releases its pre-tightening torque, driving the lifting screw 71 to rotate in the opposite direction. Through the threaded engagement, the lifting screw seat 72 moves upward along the lifting track 721, driving the upper pressure roller 8 to rise to the upper limit position and be limited by the upper limit stop block. At the same time, the steel ball 932 in the positioning part 93 on the side of the lifting screw seat 72 slides along the inclined surface of the lower groove 912 on the fixed plate 91 under the action of the lifting spring 933 and finally falls into the upper groove 911 to form a bistable lock, thereby reducing the pressure between the upper pressure roller 8 and the lower pressure roller 6 to a low pressure state, avoiding excessive stretching of the easily degradable film at low speed.

[0029] When the substrate moving speed is higher than the set upper limit threshold, the one-way centrifugal clutch 74 is fully engaged, and the rotational power of the lower pressure roller 6 is fully transmitted to the lifting screw 71 through the clutch, driving the lifting screw 71 to rotate in the forward direction and overcome the torque of the strong coil spring 73; the lifting screw seat 72 drives the upper pressure roller 8 to move downward, and the upper pressure roller 8 descends to the lower limit position and is limited by the lower limit block, and the pressure between it and the lower pressure roller 6 increases to a high pressure state to ensure the bonding strength during high-speed lamination.

[0030] When the upper pressure roller 8 descends to the lower limit, if the lamination speed continues to be high, the one-way centrifugal clutch 74 will slip briefly due to being stuck at the limit. However, since the slippage time is extremely short and the clutch does not slip further after the speed stabilizes, it will not cause damage to the parts. When the substrate moving speed falls below the lower limit threshold again, the clutch is completely disengaged, the strong coil spring 73 drives the lifting screw 71 to reverse, and the upper pressure roller 8 rises back to the upper slot 911 and locks, thereby realizing automatic, stable, and purely mechanical switching of the lamination pressure, effectively protecting the easily degradable high-barrier film and ensuring the lamination quality.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-temperature solvent-free laminating device for easily degradable high-barrier films, comprising an unwinding unit (1), wherein two unwinding rollers are provided on the unwinding unit (1) for unwinding a first substrate and a second substrate respectively, and a low-temperature coating unit (2), a low-temperature curing unit (3), and a winding unit (4) are sequentially arranged on the right side of the unwinding unit (1), characterized in that, Two mounting frames (5) are symmetrically distributed between the low-temperature coating unit (2) and the low-temperature curing unit (3). A lower pressure roller (6) is rotatably mounted on the mounting frame (5). A pressure adjustment mechanism (7) is also mounted on the mounting frame (5). The pressure adjustment mechanism (7) rotatably mounts an upper pressure roller (8) through an adjustment structure (81). The two substrates after being coated by the low-temperature coating unit (2) enter the area between the upper pressure roller (8) and the lower pressure roller (6) for lamination. The lower pressure roller (6) contacts the moving substrate surface and rotates passively by the friction between the substrate and the roller surface. The rotation of the lower pressure roller (6) is transmitted to the pressure adjustment mechanism (7). The pressure adjustment mechanism (7) adjusts the lamination pressure of the upper pressure roller (8) on the substrate in real time according to the rotation speed of the lower pressure roller (6). The mounting frame (5) is also provided with a stable positioning structure (9) for stabilizing the position of the upper pressure roller (8).

2. The low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 1, characterized in that, The pressure adjustment mechanism (7) includes a lifting screw (71) rotatably mounted on the inner side of the mounting frame (5) via a mounting shaft seat (711). A lifting rail (721) is also mounted on the inner side of the mounting frame (5). A lifting screw seat (72) is slidably mounted on the lifting rail (721). The lifting screw seat (72) is threadedly connected to the lifting screw (71). A strong coil spring (73) is mounted on the upper end of the lifting screw (71). A transmission component is mounted on the bottom end of the lifting screw (71). The transmission component is connected to the lower pressure roller (6) for transmission. Upper limit and lower limit baffles are respectively provided at the upper and lower ends of the lifting rail (721).

3. The low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 2, characterized in that, The upper end of the lifting screw (71) is equipped with two sets of vertically distributed mounting seats (711). The high-strength coil spring (73) is sleeved on the lifting screw (71) part located between the two mounting seats (711). The inner ring end of the high-strength coil spring (73) is connected to the lifting screw (71), and one end of the outer ring of the high-strength coil spring (73) is fixed to the mounting seat (711).

4. The low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 2, characterized in that, The transmission component includes a one-way centrifugal clutch (74) fixed at the bottom of the lower mounting seat (711). The output end of the one-way centrifugal clutch (74) is connected to the bottom end of the lifting screw (71). The input end of the one-way centrifugal clutch (74) is connected to a connecting shaft (741). A driven bevel gear (75) is installed at the lower end of the connecting shaft (741). A driving bevel gear (61) is installed on the lower pressure roller (6). The driving bevel gear (61) meshes with the driven bevel gear (75).

5. A low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 2, characterized in that, The adjustment structure (81) includes a fixed frame (82) fixed above the lifting screw seat (72). The fixed frame (82) has a threaded hole running through it from top to bottom. An adjusting screw (83) is threadedly connected to the threaded hole. The bottom end of the adjusting screw (83) is placed below the fixed frame (82), and the lower end of the adjusting screw (83) is rotatably connected to a lifting shaft seat (84).

6. The low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 2, characterized in that, The steady-state positioning structure (9) includes a fixing plate (91) fixed on the inner side wall of the mounting bracket (5), a mounting sleeve (92) fixed on the side of the lifting screw seat (72), and a positioning component (93) for connecting and positioning with the fixing plate (91) fixed inside the mounting sleeve (92).

7. A low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 6, characterized in that, The mounting sleeve (92) has a hollow interior with a telescopic groove. The positioning component (93) includes a telescopic block (931) that slides into the telescopic groove. A steel ball (932) is rolled into the end of the telescopic block (931) facing the fixing plate (91). A lifting spring (933) is placed in the telescopic groove. The two ends of the lifting spring (933) abut against the telescopic block (931) and the inner wall of the telescopic groove, respectively.

8. A low-temperature solvent-free composite device for easily degradable high-barrier membranes according to claim 7, characterized in that, The fixing plate (91) has an upper slot (911) and a lower slot (912) sequentially opened from top to bottom. Both the upper slot (911) and the lower slot (912) are V-shaped slots. The inclined angle of the upper slot (911) is smaller than that of the lower slot (912).

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