High-viscosity multi-layer co-extrusion self-adhesion film preparation device and preparation method
By abolishing the old-style upper traction rotation device and air cushion roller, using 360-degree one-way rotation and vector weighing device, combined with a thickness gauge and membrane storage rack, the mechanical vibration and adhesive roller risks of traditional film blowers are solved, and uniform control of film thickness and efficient rolling are achieved.
Patent Information
- Application Number
- CN202311534635.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-17
- Publication Date
- 2025-05-20
AI Technical Summary
When producing high-viscosity films, traditional film blowing machines have problems such as mechanical vibration leading to film wrinkles and high risk of sticking rollers.
A high-viscosity multi-layer coextruded self-adhesive film preparation device was designed, the old-fashioned upper traction rotation device and air cushion roller were eliminated, and a 360-degree one-way rotation and vector weighing device was adopted, combined with a thickness gauge and a membrane storage rack to achieve uniform thickness control of the film and efficient rolling.
Film forming without mechanical vibration is achieved, reducing the risk of sticking rollers, improving the uniformity of film thickness, reducing production costs, and reducing single-roll losses.
Smart Images
Figure CN120019947A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of highly viscous self-adhesive films, and particularly to a device and a preparation method for preparing highly viscous multi-layer co-extruded self-adhesive films. Background Art
[0002] A film blowing machine melts plastic particles and then blows them into films. There are many types of film blowing machines, such as PE, POF, PVC, etc. The films blown with brand-new particles are new materials, with uniform color, cleanliness, and good stretching of the bags. The dry polyethylene particles are added to the feeding hopper and enter the screw by the weight of the particles themselves. When the granular material contacts the helical edge of the screw thread, the rotating helical edge surface generates a thrust perpendicular to the helical edge surface on the plastic, pushing the plastic particles forward. During the pushing process, due to the friction between the plastic and the screw, the plastic and the barrel, as well as the collision and friction between the particles, and also due to the external heating of the barrel, the plastic gradually melts. The molten plastic passes through the head filter to remove impurities and comes out from the die orifice of the die head, is cooled by the air ring, blown and expanded, passes through the chevron plate, the haul-off roll, and the finished film is wound into a roll by the winding device.
[0003] Traditional film blowing machines have the following defects when producing highly viscous films:
[0004] 1. The old-fashioned upper haul-off rotating device is prone to mechanical vibrations during rotation start and stop, which may cause problems such as film wrinkles.
[0005] 2. The old-fashioned air cushion roll needs to be equipped with a gas filter at the motor, resulting in a large resistance of the motor. The heat dissipated during the heating of the extruder will gradually increase. The temperature of the air blown out will be relatively high due to the intake air and resistance of the air cushion roll itself, and its own filter needs to be replaced regularly, with a relatively high replacement cost. Improper control of the process flow may result in unqualified products.
[0006] 3. The high-viscosity film itself belongs to a thermoplastic elastomer. When heated, the film becomes soft and its viscosity increases, increasing the risk of sticking to the roll. Sticking to the roll may cause the film to wrap around the roll and break the film, or damage the motor and the roll.
[0007] Therefore, how to provide a device and a preparation method for preparing highly viscous multi-layer co-extruded self-adhesive films by one-step forming to solve the problems existing in the prior art is of great significance for its application. Summary of the Invention
[0008] In view of this, the purpose of the present application is to provide a device and a preparation method for preparing highly viscous multi-layer co-extruded self-adhesive films to solve the problems of film wrinkles caused by mechanical vibrations and the risk of sticking to the roll.
[0009] To achieve the above purpose, the present invention provides the following technical solutions:
[0010] A device for preparing highly viscous multi-layer co-extruded self-adhesive films, comprising a support assembly, a film forming assembly, and a winding assembly;
[0011] The support component is divided into four layers, three layers, two layers, a rotating table and a bottom layer from top to bottom, and a driving mechanism is installed on one side of the rotating table;
[0012] The film forming component includes an extruder, a melt filter, a die head, a bubble stabilizing frame, a chevron plate, a traction frame, a side material traction machine, a film splitting frame and a thickness gauge, and the winding component includes a film storage frame and a winder;
[0013] The extruder, the melt filter and the die head are installed at the top of the bottom layer, the winder is installed on both sides of the top of the rotating table, the bubble stabilizing frame is installed at the bottom of the two layers, the film storage frame is installed on both sides of the top of the two layers, the chevron plate is installed at the bottom of the three layers, the traction frame is installed at the top of the traction frame, the thickness gauge is installed on both sides of the top of the four layers, the side material traction machine is installed at the top of the four layers, the film splitting frame is installed in the middle of the top of the four layers, and a vector weighing device is installed at the top of the extruder.
[0014] Preferably, a slewing bearing and an outer ring transmission gear are provided at the bottom of the rotating table, the output shaft of the driving mechanism is drivingly connected with a driving gear, and the driving gear meshes with the transmission gear.
[0015] Preferably, a power supply slide rail is installed on the side of the rotating table, and the equipment above the rotating table is powered by the power supply slide rail.
[0016] Preferably, the number of the side material traction machines is two, the two side material traction machines are respectively installed on the front and rear sides of the film splitting frame, secondary traction rollers are arranged on both sides of the bottom of the two layers, and a CCD camera is installed at the bottom of the secondary traction rollers.
[0017] The preparation method includes the following steps:
[0018] S1. Extract the raw materials from the silo through a vacuum pipeline and enter the vector weighing device for proportioning, mixing and metering of each component of the raw materials;
[0019] S2. The extruder heats and melts the weighed and mixed raw materials and extrudes them forward through a single screw. The melted and plasticized raw materials pass through the melt filter to remove impurities and then enter the die head through a distributor in layers, and cooperate with the IBC internal cooling system to blow out an annular film bubble;
[0020] S3. The annular film bubble is stably lifted to the bubble stabilizing frame through the unidirectional traction of the first traction. The bubble stabilizing frame stabilizes the film bubble. After passing through the chevron plate, the stable film bubble is gradually flattened from a tube shape into two overlapping film shapes. The thickness control is achieved by coordinating the extrusion amount of the extruder and the speed of the traction frame, and the film is upwardly tractioned to the film splitting frame by the traction frame for splitting;
[0021] S4. The film splitting frame conveys the annular film to both sides after splitting, and the edge materials are collected by the edge material tractor. The finished single film is measured for thickness by thickness gauges on both sides.
[0022] S5. After the thin film descends to the film storage rack for storage, the upper and lower guide rollers open and close up and down to increase the walking path of the film, providing sufficient downtime for roll change. The film passes through a CCD camera for defect detection, and the detected thin film enters the winder for winding and non-stop roll change film production.
[0023] Preferably, in S2 - S5, the turntable always rotates 360 degrees unidirectionally.
[0024] Preferably, in S1:
[0025] The thin film base material is one or more of LDPE, LLDPE, HDPE, mLLDPE;
[0026] The release layer material is one or more of LDPE, LLDPE, HDPE, mLLDPE, combined with a 10% anti - sticking masterbatch with a silicon - based or fluorine - based content of 20% and an LLDPE of 80%;
[0027] The adhesive layer material is a styrene copolymer.
[0028] Preferably, one or more mixtures of hydrogenated SIS or SBS are used as the elastic layer, and resins such as terpene resin and hydrogenated rosin are used as the tackifying resin.
[0029] Preferably, the processing temperature of the thin film is between 160 - 220 degrees, and the preferred processing temperature is 185 - 210 degrees.
[0030] Preferably, the thickness ratio of the thin film is: adhesive layer 3% - 25%; substrate layer 45% - 65%; release layer ratio 25% - 45%.
[0031] Compared with the prior art, the beneficial effects of the present invention are:
[0032] 1. The film blowing machine of the present invention cancels the old - fashioned upper traction rotating device, can achieve 360 - degree unidirectional non - stop rotation, and will not cause problems such as film wrinkles caused by mechanical vibration during rotation start - stop.
[0033] 2. The present invention eliminates the air-cushioned roller. The old air-cushioned roller requires a gas filter screen to be installed at the motor, resulting in a large resistance of the motor. Affected by the ambient temperature, the blown air will also be at a high temperature. The filter screen also needs to be replaced regularly. The high-viscosity film itself belongs to a thermoplastic elastomer. When heated, the film will become soft and its viscosity will increase, increasing the risk of sticking to the roller. Sticking to the roller will cause the film to wrap around the roller and break, or damage the motor and the roller. Therefore, the advantage of this structure is obvious. It will not remain on the surface of the film adhesive layer during the high-speed sputtering process, avoiding the problem of residual bonding in the later stage.
[0034] 3. In the present invention, after the film is divided, it passes through a single-layer thickness gauge for the first time. The thickness situation measured by the thickness gauge will be fed back to the automatic air ring of the die in the first time, and the thickness can be adjusted immediately, greatly improving the thickness uniformity of the film.
[0035] 6. In the present invention, the edge material tractor is configured with two sets, reducing the walking path of the film edge material, thereby reducing the situation of broken edges. At the same time, the on-line edge material crushing device is cancelled, and no debris will be generated to affect the environment and thus the product quality.
[0036] 9. The present invention is provided with a film storage rack, which can realize the production without stopping while the film changing process stops. In this way, the situation of internal wrinkles in the old film changing method can be perfectly solved, especially for products with high hardness, high thickness and high viscosity, reducing the single-roll loss by more than 5%. While the film storage rack is working, it also lengthens the travel of the film, making the film structure more stable and reducing the increase of the unwinding force or the film deformation caused by the excessive internal tightness due to the too large roll diameter.
[0037] 12. Before the film is wound up, the present invention is configured with a high-speed defect capture device, which perfectly monitors the crystal points, black spots, impurities, etc. during the film production process, reducing the risk for customers to use.
[0038] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, so as to be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following takes the preferred embodiments of the present application and combines with the drawings to describe in detail as follows.
[0039] Based on the following detailed description of the specific embodiments of the present application in conjunction with the drawings, those skilled in the art will be more clear about the above and other purposes, advantages and features of the present application. Description of the Drawings
[0040] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0041] Figure 1 Structural schematic diagram of the present invention;
[0042] Figure 2 Thin film walking path diagram of the present invention;
[0043] Figure 3 Test content table of Embodiment 1:
[0044] Figure 4 Test result table of Embodiment 1;
[0045] Figure 5 Test content table of Embodiment 2:
[0046] Figure 6 Test result table of Embodiment 2;
[0047] Figure 7 Test content table of Embodiment 3:
[0048] Figure 8 Test result table of Embodiment 3.
[0049] In the figure: 11, bottom layer; 12, rotating table; 13, driving mechanism; 14, second layer; 15, third layer; 16, fourth layer; 20, vector weighing device; 21, extruder; 22, melt filter; 23, die head; 24, foam stabilizing frame; 25, chevron plate; 26, traction frame; 27, winder; 28, film splitting frame; 29, thickness gauge; 31, film storage rack; 32, winder. Detailed implementation manners
[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. In the following description, specific details such as specific configurations and components are provided only to assist in a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should clearly understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Additionally, for the sake of clarity and conciseness, descriptions of known functions and structures are omitted in the embodiments.
[0051] In addition, this application may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.
[0052] The term “and / or” in this document is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, B exists alone, and A and B exist simultaneously. The term “ / and” in this document describes another associated object relationship, indicating that there can be two relationships. For example, A / and B can represent: A exists alone, and A and B exist alone. In addition, the character “ / ” in this document generally indicates that the associated objects before and after are in an “or” relationship.
[0053] It should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms “comprising,” “including,” or any other variation thereof are intended to cover non-exclusive inclusion.
[0054] Please refer to Figure 1-8 , the present invention provides a technical solution for a device and a preparation method for preparing a highly viscous multi-layer co-extruded self-adhesive film: including a support assembly, a film forming assembly, and a winding assembly;
[0055] The support assembly is divided into four layers 16, three layers 15, two layers 14, a rotating table 12, and a bottom layer 11 from top to bottom. A driving mechanism 13 is installed on one side of the rotating table 12;
[0056] The film forming assembly includes an extruder 21, a melt filter 22, a die head 23, a bubble stabilizer 24, a chevron plate 25, a traction frame 26, a side material tractor 27, a film splitting frame 28, and a thickness gauge 29. The winding assembly includes a film storage rack 31 and a winder 32;
[0057] The extruder 21, the melt filter 22, and the die head 23 are installed at the top of the bottom layer 11. The winder 32 is installed on both sides of the top of the rotating table 12. The bubble stabilizer 24 is installed at the bottom of the two layers 14. The film storage rack 31 is installed on both sides of the top of the two layers 14. The chevron plate 25 is installed at the bottom of the three layers 15. The traction frame 26 is installed at the top of the traction frame 26. The thickness gauge 29 is installed on both sides of the top of the four layers 16. The side material tractor 27 is installed at the top of the four layers 16. The film splitting frame 28 is installed in the middle of the top of the four layers 16. A vector weighing device 20 is installed at the top of the extruder 21.
[0058] The blown film machine is equipped with a new type of high-efficiency disc filter, which solves the problems of film crystal points, black spots and other defects, will not cause problems such as bubble breakage during the processing process, and at the same time does not affect the screw back pressure so as to affect the production capacity.
[0059] A transmission gear is arranged at the bottom end of the rotating table 12. The output shaft of the driving mechanism 13 is drivingly connected with a driving gear. The driving gear meshes with the transmission gear. A power supply slide rail is installed on the side of the rotating table 12. All the equipment above the rotating table 12 is powered by the power supply slide rail. The overall rotating turntable uses a turbine giant support rolling bearing with a diameter of up to 7.8 meters and a load-bearing capacity of up to 350 tons. Therefore, the overall rotating stability is guaranteed (the conventional equipment is less than 40 tons). The old-fashioned upper traction rotating device of the blown film machine is cancelled, and it can rotate 360 degrees unidirectionally without stopping. (The actual rotating angle of the old-fashioned one is only about 350 degrees), and there will be no mechanical vibration caused by the start and stop of rotation, which will cause problems such as film wrinkles. The air cushion roller is cancelled (the old-fashioned air cushion roller needs to install a gas filter at the motor, resulting in a large resistance of the motor. Affected by the ambient temperature, the blown air will be high temperature, and the filter needs to be replaced regularly). The high-viscosity film itself belongs to a thermoplastic elastomer. When heated, the film will become soft and the viscosity will increase, increasing the risk of sticking to the roller (sticking to the roller will cause the film to wrap around the roller and break the film, or damage the motor and the roller). Therefore, the advantage of our this structure is obvious. The air blown out by the old-fashioned air cushion roller contains water vapor impurities and other substances, which will remain on the surface of the film adhesive layer during the high-speed sputtering process, causing problems of residual bonding in the later stage.
[0060] The number of the edge material traction machines 27 is two. The two edge material traction machines 27 are respectively installed on the front and back sides of the film splitting frame 28, reducing the walking path of the film, thereby reducing the situation of edge breakage. At the same time, the on-line edge material crushing device is cancelled, and no debris will be generated to affect the environment and thus affect the product quality.
[0061] Secondary traction rollers are arranged on both sides of the bottom end of the second layer 14. A CCD camera is installed at the bottom end of the secondary traction roller. Before the film is wound, a high-speed defect capture device is configured to perfectly monitor the crystal points, black spots, impurities, etc. during the film production process, reducing the use risk of customers.
[0062] Sandblasting anti-sticking treatment is done on the rollers in contact with the adhesive layer of this machine. It is suitable for products such as ultra-thin (10um and above), high-viscosity (1200gf tested on steel plate), etc. The maximum width can reach 4500mm, and it is suitable for the use of multi-layer co-extruded self-adhesive protective films with 2 layers and above (preferably 3 layers), and more preferably 5 layers of co-extrusion.
[0063] A method for preparing a high-viscosity film includes the following steps:
[0064] S1. Extract the raw materials from the silo through a vacuum pipeline and enter the vector weighing device 20 for the proportioning and mixing measurement of each component of the raw materials;
[0065] S2. The extruder heats and melts the weighed and mixed raw materials and extrudes them forward through a single screw. After the raw materials are melted and plasticized, they pass through the melt filter 22 to remove impurities, and then enter the die head 23 through the distributor in layers, and cooperate with the IBC internal cooling system to blow out an annular film bubble;
[0066] S3. The annular film bubble is steadily lifted by unidirectional traction of the first traction to the bubble stabilizing frame 24. The bubble stabilizing frame 24 stabilizes the film bubble. After being stabilized, the film bubble passes through the chevron plate 25 and is gradually flattened from tubular shape into two overlapping film layers. The thickness control is achieved by the cooperation of the extrusion amount of the extruder 21 and the speed of the traction frame 26, and the film is upwardly tractioned by the traction frame 26 to the film splitting frame 28 for splitting;
[0067] S4. After the film splitting frame 28 splits the annular film, it conveys the film to both sides. The edge materials are collected by the edge material traction machine 27, and the finished single film is thickness measured by the thickness gauges 29 on both sides;
[0068] S5. After the film descends to the film storage rack 31 for storage, by the opening and closing of the upper and lower rows of guiding rollers, the running path of the film is increased to provide sufficient time for stopping the machine to change the film during roll changing. The film passes through the CCD camera for defect detection, and the detected film enters the rewinder 32 for winding and continuous roll changing film production.
[0069] During S2 - S5, the turntable 12 always rotates unidirectionally by 360 degrees.
[0070] In S1:
[0071] The film base material is one or more of LDPE, LLDPE, HDPE, and mLLDPE;
[0072] The release layer material is one or more of LDPE, LLDPE, HDPE, and mLLDPE, and is compounded with 10% anti - sticking masterbatch (masterbatch with 20% silicon - based or fluorine - based content and 80% LLDPE);
[0073] The adhesive layer material is a styrene - based copolymer.
[0074] One or more mixtures of hydrogenated SIS or SBS are used as the elastic layer, and resins such as terpene resin and hydrogenated rosin are used as the tackifying resin.
[0075] The film processing temperature is between 160 - 220 degrees, and the preferred processing temperature is 185 - 210 degrees.
[0076] The thickness ratio of the film: the adhesive layer is 3% - 25%; the base material layer is 45% - 65%; the release layer ratio is 25% - 45%.
[0077] Example 1:
[0078] Release layer: antiblocking masterbatch and LDPE;
[0079] Base material layer: LDPE and LLDPE;
[0080] Adhesive layer: styrene copolymer and terpene resin;
[0081] The thickness ratios of the release layer, the base material layer, and the adhesive layer are 40%, 40%, and 20% respectively
[0082] Control test groups 1-4 were carried out with reference to the raw material formula of Example 1: The test contents and results are referred to Figure 3 and Figure 4 ;
[0083] From the comprehensive evaluation of cost and processability, Example 4 is the preferred solution.
[0084] Example 2:
[0085] Release layer: antiblocking masterbatch, LLDPE, LDPE;
[0086] Base material layer: LDPE and LLDPE;
[0087] Adhesive layer: styrene copolymer and terpene resin;
[0088] The thickness ratios of the release layer, the base material layer, and the adhesive layer are 40%, 40%, and 20% respectively
[0089] Control test groups 5-8 were carried out with reference to the raw material formula of Example 2: The test contents and results are referred to Figure 6 and Figure 7 ;
[0090] From the perspective of the unwinding effect, adding LLDPE to the surface layer will affect the unwinding force. The preferred example is Example 5, and Example 5 is the preferred solution.
[0091] Example 3:
[0092] Release layer: antiblocking masterbatch, LDPE;
[0093] Base material layer: mLLDPE, LDPE and LLDPE;
[0094] Adhesive layer: styrene copolymer and terpene resin;
[0095] The thickness ratios of the release layer, the base material layer, and the adhesive layer are 40%, 40%, and 20% respectively
[0096] Control test groups 9-12 were carried out with reference to the raw material formula of Example 3: The test contents and results are referred to Figure 8 ;
[0097] After adding mLLDPE to the base material layer, the film becomes significantly softer and the elongation at break is significantly improved.
[0098] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. For those skilled in the art, various changes and modifications can be made to the present invention. Any changes, modifications, substitutions, integrations, and parameter changes made to these embodiments by means of conventional substitutions or capable of achieving the same functions without departing from the principle and spirit of the present invention fall within the protection scope of the present invention.
Claims
1. High-viscosity multi-layer co-extruded self-adhesive film preparation device, characterized by: It includes a supporting component, a film forming component and a winding component; The support assembly is divided into four layers (16), three layers (15), two layers (14), a rotating platform (12) and a bottom layer (11) from top to bottom, and a driving mechanism (13) is installed on one side of the rotating platform (12); The film forming component comprises an extruder (21), a melt filter (22), a die head (23), a bubble stabilizing frame (24), a herringbone plate (25), a traction frame (26), a side material traction machine (27), a film separation frame (28) and a thickness gauge (29), and the winding component comprises a film storage frame (31) and a winding machine (32); The extruder (21), melt filter (22) and die head (23) are installed on the top of the bottom layer (11), the winder (32) is installed on both sides of the top of the rotating table (12), the bubble stabilizing frame (24) is installed on the bottom of the second layer (14), the film storage frame (31) is installed on both sides of the top of the second layer (14), the herringbone plate (25) is installed on the bottom of the third layer (15), the traction frame (26) is installed on the top of the traction frame (26), the thickness gauge (29) is installed on both sides of the top of the fourth layer (16), the edge material traction machine (27) is installed on the top of the fourth layer (16), the film separation frame (28) is installed in the middle of the top of the fourth layer (16), and a vector weighing device (20) is installed on the top of the extruder (21).
2. The high-viscosity multi-layer co-extruded self-adhesive film preparation device according to claim 1, characterized in that: A transmission gear is arranged at the bottom end of the rotating platform (12), and the output shaft of the driving mechanism (13) is transmission-connected with the driving gear, and the driving gear is meshed with the transmission gear.
3. The high-viscosity multi-layer co-extruded self-adhesive film preparation device according to claim 2, characterized in that: A power supply slide rail is installed on the side of the rotating table (12), and the equipment above the rotating table (12) is powered by the power supply slide rail.
4. The high-viscosity multi-layer co-extruded self-adhesive film preparation device and preparation method as claimed in claim 3, characterized in that: There are two edge material tractors (27), which are respectively installed on the front and rear sides of the film separation frame (28). Secondary traction rollers are arranged on both sides of the bottom end of the second layer (14), and a CCD camera is installed at the bottom end of the secondary traction rollers.
5. A method for preparing a high-viscosity multi-layer co-extruded self-adhesive film, characterized in that: A device for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to any one of claims 1 to 4, wherein the preparation method comprises the following steps: S1. Extract the raw materials from the silo through the vacuum pipeline and enter the vector weighing device to measure the proportion of each component raw material; S2, the extruder heats and melts the weighed and mixed raw materials and extrude them forward through a single screw. The melted and plasticized raw materials pass through a melt filter (22) to remove impurities and then enter the die head (23) in layers through a distributor, and blow out an annular film bubble in cooperation with an IBC internal cooling system; S3, the annular film bubble is stably raised to the bubble stabilizing frame (24) through the unidirectional traction of the first traction, and the film bubble is stabilized by the bubble stabilizing frame (24). After the stabilization, the film bubble is gradually flattened from a tube shape to an overlapping two-layer film shape after passing through the herringbone plate (25). The thickness is controlled by the extrusion amount of the extruder (21) and the speed of the traction frame (26), and the film is pulled upward by the traction frame (26) to the film separation frame (28) for segmentation; S4, the film splitting frame (28) splits the annular film and transports it to both sides, the edge material is collected by the edge material tractor (27), and the thickness of the finished single film is measured by the thickness gauges (29) on both sides; S5, after the film is moved down to the film storage rack (31) for storage, the upper and lower rows of guide rollers are opened and closed to increase the film's travel path, providing sufficient downtime for film change. The film is inspected for defects by a CCD camera, and the inspected film enters the winder (32) for winding and non-stop film change production.
6. The method for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to claim 5, characterized in that: In the steps S2-S5, the rotating table (12) always performs 360-degree unidirectional rotation.
7. The method for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to claim 6, characterized in that: In S1: The film base material is one or more of LDPE, LLDPE, HDPE, mLLDPE; One or more of the release layer materials LDPE, LLDPE, HDPE, mLLDPE, with 10% anti-sticking masterbatch (masterbatch with 20% silicone or fluorine content and 80% LLDPE); The adhesive layer material is styrene copolymer.
8. The method for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to claim 7, characterized in that: One or more mixtures of hydrogenated SIS or SBS are used as the elastic layer, and resins such as terpene resin and hydrogenated rosin are used as tackifying resins.
9. The method for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to claim 8, characterized in that: The film processing temperature is between 160 and 220 degrees, and the preferred processing temperature is between 185 and 210 degrees.
10. The method for preparing a high-viscosity multi-layer co-extruded self-adhesive film according to claim 9, characterized in that: The thickness of the film is as follows: the adhesive layer is 3%-25%; the substrate layer is 45%-65%; and the release layer is 25%-45%.