Synthetic paper production device and method

Abstract

The invention discloses a synthetic paper production device, and relates to the technical field of extrusion molding, the synthetic paper production device comprises an extrusion device and a mold assembly, the extrusion device comprises a driving motor and a second supporting plate, an extrusion barrel is fixedly arranged between the driving motor and the second supporting plate, one end of the extrusion barrel is provided with a feeding port, and a center shaft is rotatably arranged in the extrusion barrel; a spline is fixedly arranged on the central shaft, a thick screw rod, a middle screw rod and a thin screw rod are arranged on the central shaft, the screw pitch of the thick screw rod is larger than that of the middle screw rod and larger than that of the thin screw rod, and heating assemblies are arranged in the middle screw rod and the thin screw rod. And the thick screw rod, the middle screw rod and the thin screw rod are used for conveying in the direction of the mold assembly, heating is conducted at the same time, the density of the screw rollers is increased in the direction, and heating efficiency is improved due to the fact that heating structures are arranged on the roller blades.

Description

Technical Field

[0001] The present invention relates to the technical field of extrusion molding, and in particular to a synthetic paper production device. Background Art

[0002] In the process of synthetic paper production, melt extrusion is one of the core steps that determine the product performance. It heats thermoplastic polymer materials such as polypropylene and polyethylene to a molten state and extrudes them into a shape, directly affecting the uniformity, mechanical properties, and surface quality of the synthetic paper. In the traditional melt extrusion process, the barrel of the extruder is usually temperature-controlled in sections by resistance heating. However, due to large thermal inertia and temperature response lag, it is easy to cause fluctuations in the melt temperature, which in turn leads to local overheating degradation or insufficient melting of the material, manifested as problems such as unstable melt flow index and "shark skin" defects on the film surface. In addition, the traditional heating mode has high energy consumption. Although the prior art attempts to improve heat transfer by optimizing the screw structure or adding a heat insulation layer, it still cannot fundamentally solve the problems of uneven temperature field distribution, molecular chain breakage caused by different thermal histories, and product performance degradation. Summary of the Invention

[0003] In view of the above technical problems, the present invention discloses a synthetic paper production device, including an extrusion device and a die assembly. The extrusion device includes a driving motor and a second support plate. An extrusion barrel is fixedly installed between the driving motor and the second support plate. A feeding port is provided at one end of the extrusion barrel. A central shaft is rotatably installed in the extrusion barrel. A spline is fixedly installed on the central shaft. A thick screw rod, a medium screw rod, and a thin screw rod are installed on the central shaft. The pitch of the thick screw rod is greater than the pitch of the medium screw rod, and the pitch of the medium screw rod is greater than the pitch of the thin screw rod. A heating component is arranged inside the medium screw rod and the thin screw rod. Through the above technical solution, different materials are added to the extrusion device and conveyed towards the die assembly through the thick screw rod, the medium screw rod, and the thin screw rod, while being heated. Along this direction, the density of the spiral rollers increases. Since heating structures are also provided on the roller blades, the heating efficiency is improved.

[0004] Further, a first insertion rod is fixedly installed at one end of the thin screw rod. A first insertion hole is provided at the first end of the medium screw rod. The first insertion hole is slidably connected to the first insertion rod.

[0005] Further, a second insertion rod is fixedly installed at the second end of the medium screw rod. A second insertion hole is provided at the first end of the thick screw rod. The second insertion hole is slidably connected to the second insertion rod.

[0006] Further, a sleeve is sleeved on the second end of the thick screw rod, and an extrusion spring is fixedly installed between the thick screw rod and the extrusion barrel. Through the above technical solution, when the mixed raw materials are transported to the end of the extrusion barrel, they will accumulate. At this time, if the opening at one end of the extrusion barrel is not opened, if the raw materials accumulate too much, they cannot continue to move. At this time, the middle screw rod and the thin screw rod move away from each other. If the accumulation continues, eventually the middle screw rod and the thick screw rod will also separate, and continuous heating will be carried out.

[0007] Further, the die assembly includes a bottom plate, a vertical slide rail is fixedly installed on the bottom plate, a moving frame is slidably installed on the vertical slide rail, and a plurality of T-shaped dies are slidably installed on the moving frame. The shapes of the plurality of T-shaped dies are different and are docked with the extrusion device.

[0008] Further, a horizontal cylinder is fixedly installed on the second support plate, a barrier strip is fixedly installed on the cylinder arm of the horizontal cylinder, and the barrier strip drives the T-shaped die to approach the extrusion device.

[0009] Further, a pushing block is fixedly installed inside the barrier strip, and a mating shaft is fixedly installed on the T-shaped die. The T-shaped die moves to a position corresponding to the pushing block.

[0010] Further, a sealing plate is fixedly installed at one end of the extrusion barrel close to the die assembly. A slider is fixedly and slidably installed inside the sealing plate, and a through hole is provided in the slider. The first end of the T-shaped die is fixedly installed with a feed nozzle, and the feed nozzle is inserted into the through hole. Through the above technical solution, the up and down movement of the moving frame can combine different T-shaped dies with the extrusion device, so that different thin papers can be output. The horizontal cylinder can drive the T-shaped die to be connected with the extrusion device. When switching, the slider seals the opening. At this time, the middle screw rod and the thin screw rod move away from each other for compensation. After the switching is completed, the work can continue. The degree of automation is high, and it can also ensure that the extrusion device completes the switching of the T-shaped die without stopping the machine.

[0011] The present invention also discloses a method for producing synthetic paper, including the following steps: Step 1: Raw material pretreatment, drying and mixing one or more raw materials; Step 2: Melting and extrusion, putting the mixed raw materials into an extrusion device for melting and extrusion; Step 3: Casting and forming, the material flowing out of the extrusion device enters the die assembly, and different T-shaped dies are selected according to requirements.

[0012] Step 4: Biaxial stretching, preheating the tenter frame, adjusting the stretching speed, performing horizontal and vertical stretching, and winding up.

[0013] The beneficial effects of the present invention compared with the prior art are: (1) Through the technical solution of the present invention, different materials are added to the extrusion device and conveyed towards the die assembly through the thick screw rod, medium screw rod, and fine screw rod, while heating is carried out. Along this direction, the density of the spiral rollers increases. Since heating structures are also provided on the roller blades, the heating efficiency is improved.

[0014] (2) Through the technical solution of the present invention, when the mixed raw materials are transported to the end of the extrusion barrel, they will accumulate. At this time, if the opening at one end of the extrusion barrel is not opened and the raw materials accumulate too much, they will not be able to move further. At this time, the medium screw rod and the fine screw rod move away from each other. If the accumulation continues, eventually the medium screw rod and the thick screw rod will also separate, and continuous heating will be carried out.

[0015] (3) Through the technical solution of the present invention, the up and down movement of the moving frame enables different T-shaped dies to be combined with the extrusion device, so that different thin papers can be output. The horizontal cylinder can drive the T-shaped die to be connected with the extrusion device. When switching, the slider blocks the opening. At this time, the medium screw rod and the fine screw rod move away from each other for compensation. After the switching is completed, it can continue to work. The degree of automation is high, and it can also ensure that the extrusion device completes the T-shaped die switching without stopping the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a synthetic paper production device of the present invention.

[0017] Figure 2 It is a schematic diagram of the extrusion device of a synthetic paper production device of the present invention.

[0018] Figure 3 It is Figure 2 the cross-sectional view at C-C in

[0019] Figure 4 It is Figure 3 the enlarged view at A in

[0020] Figure 5 It is Figure 3 the enlarged view at B in

[0021] Figure 6 It is a partial explosion view of a synthetic paper production device of the present invention.

[0022] Figure 7 It is a schematic diagram of the die assembly of a synthetic paper production device of the present invention.

[0023] Figure 8 It is a partial schematic diagram of the die assembly of a synthetic paper production device of the present invention.

[0024] Attached drawing reference numerals: 1 - extrusion device; 2 - die assembly; 101 - first support plate; 102 - drive motor; 103 - feeding port; 104 - extrusion barrel; 105 - second support plate; 106 - thick screw rod; 107 - medium screw rod; 108 - thin screw rod; 109 - first plug rod; 110 - first jack; 111 - second plug rod; 112 - second jack; 113 - spline; 114 - central shaft; 115 - sleeve; 116 - extrusion spring; 117 - sealing plate; 118 - chute; 119 - slider; 120 - through hole; 121 - telescopic rod; 122 - sealing plate; 201 - bottom plate; 202 - vertical slide rail; 203 - moving frame; 204 - T-shaped die; 205 - sliding strip; 206 - shaft cap; 207 - return spring; 208 - sliding shaft; 209 - cylinder seat; 210 - horizontal cylinder; 211 - barrier strip; 212 - pushing block; 213 - mating shaft; 214 - lifting cylinder; 215 - feed nozzle. Detailed implementation mode

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figures 1-8 shown, a synthetic paper production device includes an extrusion device 1 and a die assembly 2. The extrusion device 1 and the die assembly 2 are the core units in the production process, jointly realizing the precise forming of high molecular materials from melting and plasticizing to high-performance films. Through segmented electromagnetic heating and high length-diameter ratio screw design, high-filled raw materials such as polypropylene and calcium carbonate are fully melted and homogenized. The forming system adopts a casting-stretching integrated process. After the melt is extruded through the T-shaped die head, it is assisted by an air knife to adhere to the mirror cooling roll, and a homogeneous primary film is formed at an ultra-fast cooling rate of 100 °C / s. Subsequently, it undergoes 4-10 times synchronous orientation through a biaxial stretching unit. While reducing the film thickness to 20-50 μm, the tensile strength is increased to more than 120 MPa. The system integrates intelligent temperature control and tension closed-loop feedback, which can reduce energy consumption by 30% and control the product thickness tolerance within ±1.5 μm, significantly optimizing the mechanical properties and surface flatness of the synthetic paper.

[0027] In this embodiment, the extrusion device 1 includes a driving motor 102 and a second support plate 105. An extrusion barrel 104 is fixedly installed between the driving motor 102 and the second support plate 105. One end of the extrusion barrel 104 is provided with a feeding port 103, and the raw materials after mixing are fed in through the feeding port 103. A central shaft 114 is rotatably installed in the extrusion barrel 104. The driving motor 102 is fixedly installed on the first support plate 101, and a central shaft 114 is fixedly installed on the rotating shaft of the driving motor 102 to drive the central shaft 114 to rotate. A spline 113 is fixedly installed on the central shaft 114. A thick screw rod 106, a medium screw rod 107, and a thin screw rod 108 are installed on the central shaft 114. This is a sliding connection, and the rotation of the central shaft 114 can drive the thick screw rod 106, the medium screw rod 107, and the thin screw rod 108 to rotate, which is driven by the spline 113 through the key groove. The pitch of the thick screw rod 106 is greater than the pitch of the medium screw rod 107 which is greater than the pitch of the thin screw rod 108. Heating components are arranged inside the medium screw rod 107 and the thin screw rod 108. The extrusion barrel 104 is axially divided into a feeding section, a compression section, a melting section, and a homogenization section. The segmented electromagnetic heating technology is adopted, and the temperature control accuracy reaches plus or minus 1 degree Celsius. Among them, the initial temperature of the feeding section is set at 160 degrees Celsius and gradually rises in a gradient manner to 220 degrees Celsius in the melting section. Temperature sensors are embedded inside the screw rods to feedback data in real time to dynamically adjust the heating power to avoid local overheating or insufficient melting. The die head area is independently configured with a closed-loop temperature control module, and the heat is evenly distributed through the hot runner to maintain the lip temperature within the range of 200 degrees Celsius to 205 degrees Celsius. In the forming unit, the cast primary film is evenly heated to 140 degrees Celsius through the preheating roller group.

[0028] The heating components are also arranged on the spiral fan blades. The smaller the pitch, the higher the heating efficiency. Different materials are added into the extrusion device 1 and are conveyed towards the die assembly 2 through the thick screw rod 106, the medium screw rod 107, and the thin screw rod 108, and are heated simultaneously. Along this direction, the density of the spiral rollers increases. Since heating structures are also arranged on the roller blades, the heating efficiency is improved.

[0029] In this embodiment, a first plug rod 109 is fixedly installed at one end of the thin screw rod 108. A first jack 110 is provided at the first end of the middle screw rod 107. The first jack 110 is slidably connected to the first plug rod 109. A second plug rod 111 is fixedly installed at the second end of the middle screw rod 107. A second jack 112 is provided at the first end of the thick screw rod 106. The second jack 112 is slidably connected to the second plug rod 111. A sleeve 115 is sleeved on the second end of the thick screw rod 106. A compression spring 116 is fixedly installed between the thick screw rod 106 and the extrusion barrel 104. A sealing disc 117 is fixedly installed at one end of the extrusion barrel 104 close to the die assembly 2. A slider 119 is fixedly and slidably installed inside the sealing disc 117. A chute 118 is provided inside the sealing disc 117. The slider 119 is slidably installed in the chute 118. A telescopic rod 121 is fixedly installed in the chute 118. The telescopic rod 121 drives the slider 119 to slide, playing the role of a valve. A through hole 120 is provided inside the slider 119. When the mixed raw material is transported to the end of the extrusion barrel 104, it will accumulate. At this time, the opening at one end of the extrusion barrel 104 is not opened. If the raw material accumulates too much, it cannot continue to move. At this time, the middle screw rod 107 and the thin screw rod 108 move away from each other. If the accumulation continues, eventually the middle screw rod 107 and the thick screw rod 106 will also separate, and continuous heating will be carried out.

[0030] In this embodiment, the die assembly 2 includes a bottom plate 201. Two vertical slide rails 202 are fixedly installed on the bottom plate 201, respectively located on both sides of the bottom plate 201. A moving frame 203 is slidably installed on the vertical slide rails 202 and can slide vertically. A lifting cylinder 214 is fixedly installed on one of the vertical slide rails 202. The lifting cylinder 214 drives the moving frame 203 to slide up and down. A plurality of T-shaped dies 204 are slidably installed on the moving frame 203. Specifically, there are three in this embodiment. The shapes of the three T-shaped dies 204 are different, so that the shapes of the produced paper are different. The T-shaped dies 204 are docked with the extrusion device 1, and are extruded through the extrusion device 1 and then formed by casting through the die assembly 2. In this embodiment, a cylinder seat 209 is fixedly installed on the second support plate 105. Two first plug rods 109 are provided, respectively located on both sides of the second support plate 105. A transverse cylinder 210 is fixedly installed on the cylinder seat 209. A blocking strip 211 is fixedly installed on the cylinder arm of the transverse cylinder 210. Two upper and lower sliding shafts 208 are fixedly installed on the blocking strip 211. The sliding shafts 208 are slidably connected to the second support plate 105. A shaft cap 206 is fixedly installed at the end of the sliding shaft 208. A return spring 207 is fixedly installed between the shaft cap 206 and the second support plate 105. The transverse cylinder 210 drives the blocking strip 211 to move, and then drives the sliding shafts 208 to slide and stretch the return spring 207. The blocking strip 211 drives the T-shaped dies 204 to approach the extrusion device 1.

[0031] In this embodiment, a pushing block 212 is fixedly installed inside the barrier strip 211. The upper and lower ends of the pushing block 212 are inclined planes, and there is a groove in the middle part. After the barrier strip 211 contacts the pushing block 212, it gradually gets stuck in the groove through the inclined plane. At this time, starting the horizontal cylinder 210 can pull the T-shaped mold 204 to a position close to the extrusion device 1. A mating shaft 213 is fixedly installed on the T-shaped mold 204, and the T-shaped mold 204 moves to a position corresponding to the pushing block 212. A feed nozzle 215 is fixedly installed at the first end of the T-shaped mold 204, and the feed nozzle 215 is inserted into the through hole 120. Through the above technical solution, the up and down movement of the moving frame 203 can enable different T-shaped molds 204 to be combined with the extrusion device 1, so that different thin papers can be output. The horizontal cylinder 210 can drive the T-shaped mold 204 to be connected to the extrusion device 1. When switching, the slider 119 seals the opening. At this time, the middle screw rod 107 and the fine screw rod 108 move away from each other for compensation. After the switching is completed, it can continue to work. The degree of automation is high, and it can also ensure that the extrusion device 1 completes the switching of the T-shaped mold 204 without stopping the machine.

[0032] The present invention also discloses a method for producing synthetic paper, which includes the following steps: Step 1: Raw material pretreatment, drying and mixing one or more raw materials; putting polypropylene (PP) particles, calcium carbonate (CaCO3, particle size 1250 mesh), and titanium dioxide (rutile type) into the pretreatment section according to the formula ratio. First, the PP particles are continuously dried in a vacuum drying oven at a constant temperature of 90°C for 6 hours, and are monitored in real time by an on-line moisture detector to ensure that the moisture content ≤ 0.03% to avoid the generation of bubbles during the melting process; subsequently, the dried raw materials and functional additives are accurately metered by a loss-in-weight feeder and put into a high-speed mixer to be mixed at a speed of 500 rpm for 25 minutes to form a uniform masterbatch. The mixing process adopts a three-dimensional motion trajectory design to ensure the dispersion uniformity of the CaCO3 filler and the PP matrix.

[0033] Step 2: Melting and extrusion, putting the mixed raw materials in the extrusion device 1 for melting and extrusion. The pretreated masterbatch is put into the extrusion device 1 through a closed conveying pipeline for melting and plasticizing. The extrusion device 1 is divided into three temperature control zones: a feeding section (160°C), a compression section (195°C), and a melting section (215°C), and the precision control of ±1°C is achieved through electromagnetic heating. The screw speed is set at 250 rpm, and a melt pump and a 200-mesh double-layer filter screen are used to ensure the stability of the melt flow index. The design of the high-shear section strengthens the interfacial bonding force between CaCO3 and PP, avoiding melt fracture or local degradation.

[0034] Step 3: Casting forming. The material flowing out of the extrusion device 1 enters the die assembly 2, and different T-dies 204 are selected according to requirements. The T-die 204 is switched according to the product specifications. In this embodiment, the width is selected to be 1.2 - 3.0 m, and the lip gap is 0.5 - 1.2 mm. A flow-blocking adjustment block and an automatic lip fine-tuning system are arranged in the inner cavity of the T-die 204, with an accuracy of ±0.003 mm, so that the deviation of the melt lateral flow velocity uniformity is < 2%. The cast film is attached to the mirror cooling roll by an air knife and rapidly cooled and shaped at 150 °C / s to form a primary film with a thickness of 200 - 300 μm, and the process parameters are adjusted in real time through a β-ray thickness gauge.

[0035] Step 4: Biaxial stretching. The primary film is uniformly heated to 140 °C by a preheating roll group and then enters the longitudinal stretching zone for orientation at a stretching ratio of 4.5 times and a linear speed of 120 m / min; subsequently, it enters the transverse stretching machine, is heated to 155 °C by infrared radiation, the width is expanded to a stretching ratio of 9 times on the tenter frame track, and the internal stress is eliminated in the heat setting section at 160 °C, finally forming a high-strength film with a thickness of 50 μm ± 1.5 μm. After stretching, it is corona-treated to increase the surface dyne value to 46 mN / m, then a water-based acrylic coating is applied by an on-line coating unit, and finally it is wound up by a constant-tension winder, and a CCD vision system is equipped to detect defects such as pinholes and fish eyes.

[0036] Working principle: The mixed raw materials are fed into the extrusion barrel 104 through the feeding port 103. The driving motor 102 is started to drive the central shaft 114, and the central shaft 114 drives the thick screw rod 106, the medium screw rod 107, and the thin screw rod 108 to rotate. The raw materials are further mixed and move towards the die assembly 2. During this process, the medium screw rod 107 and the thin screw rod 108 are heated simultaneously. The diameters of the central shafts of the thick screw rod 106, the medium screw rod 107, and the thin screw rod 108 gradually become smaller, and the pitch also becomes smaller. The distance from this central shaft to the extrusion barrel 104 becomes larger. Then it can ensure that the transportation speeds at all positions are approximately equal, and the heating efficiency gradually increases. Because the pitch becomes smaller, the material gradually accumulates after contacting the plugging disc 117. If it keeps accumulating, then the medium screw rod 107 and the thin screw rod 108 will slide away from the plugging disc 117, and the thick screw rod 106 will squeeze the compression spring 116. There is a sleeve 115 covering it, and the raw materials will not fall into the compression spring 116. The lifting cylinder 214 is started, and the lifting cylinder 214 drives the moving frame 203. The moving frame 203 drives the T-shaped die 204 to a specified height, so that the mating shaft 213 on the selected T-shaped die 204 abuts against the groove on the pushing block 212. Then the transverse cylinder 210 is started, and the pushing block 212 is driven through the barrier strip 211. The pushing block 212 drives the mating shaft 213 to approach the extrusion device 1. Finally, the feed nozzle 215 is inserted into the through hole 120. The slider 119 is controlled by the telescopic rod 121 to expose the through hole 120. The sliding strip 205 is fixedly installed on the T-shaped die 204, and the sliding strip 205 is slidably connected to the moving frame 203. At this time, the melting in the extrusion device 1 is completed, the through hole 120 is opened, and then it enters the T-shaped die 204 for molding. If it is necessary to switch the T-shaped die 204, then the through hole 120 is closed, and then the transverse cylinder 210 is started in the reverse direction. The transverse cylinder 210 drives the T-shaped die 204 away from the extrusion device 1. Then the lifting cylinder 214 is started to drive the moving frame 203 to lift and lower to select a different T-shaped die 204.

[0037] Only some exemplary embodiments of the present invention are described by way of illustration above. Without doubt, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A synthetic paper production device, characterized in that, It includes an extrusion device (1) and a die assembly (2). The extrusion device (1) includes a driving motor (102) and a second support plate (105). An extrusion barrel (104) is fixedly installed between the driving motor (102) and the second support plate (105). A feeding port (103) is provided at one end of the extrusion barrel (104). A central shaft (114) is rotatably installed in the extrusion barrel (104). A spline (113) is fixedly installed on the central shaft (114). A thick screw rod (106), a medium screw rod (107), and a thin screw rod (108) are installed on the central shaft (114). The pitch of the thick screw rod (106) is greater than the pitch of the medium screw rod (107), and the pitch of the medium screw rod (107) is greater than the pitch of the thin screw rod (108). Heating components are arranged inside the medium screw rod (107) and the thin screw rod (108), and heating components are arranged on the spiral blades of the medium screw rod (107) and the thin screw rod (108).

2. The synthetic paper production device according to claim 1, characterized in that, One end of the thin screw rod (108) is fixedly installed with a first plug rod (109). A first jack (110) is provided at the first end of the medium screw rod (107). The first jack (110) is slidably connected to the first plug rod (109).

3. The synthetic paper production device according to claim 2, wherein, A second plug rod (111) is fixedly installed at the second end of the medium screw rod (107). A second jack (112) is provided at the first end of the thick screw rod (106). The second jack (112) is slidably connected to the second plug rod (111).

4. A synthetic paper production device according to claim 3, characterized in that, A sleeve (115) is sleeved on the second end of the thick screw rod (106). A compression spring (116) is fixedly installed between the thick screw rod (106) and the extrusion barrel (104).

5. The synthetic paper production device according to claim 4, characterized in that, The die assembly (2) includes a bottom plate (201). A vertical slide rail (202) is fixedly installed on the bottom plate (201). A moving frame (203) is slidably installed on the vertical slide rail (202). A plurality of T-shaped dies (204) are slidably installed on the moving frame (203). The shapes of the plurality of T-shaped dies (204) are different and are docked with the extrusion device (1).

6. The synthetic paper production device according to claim 5, characterized in that, A transverse cylinder (210) is fixedly installed on the second support plate (105). A barrier strip (211) is fixedly installed on the cylinder arm of the transverse cylinder (210). The barrier strip (211) drives the T-shaped die (204) to approach the extrusion device (1).

7. The synthetic paper production device according to claim 6, characterized in that, A pushing block (212) is fixedly installed inside the barrier strip (211). A mating shaft (213) is fixedly installed on the T-shaped die (204). The T-shaped die (204) moves to a position corresponding to the pushing block (212).

8. A synthetic paper production device according to claim 7, characterized in that, A sealing plate (117) is fixedly installed at one end of the extrusion barrel (104) close to the die assembly (2). A slider (119) is fixedly and slidably installed inside the sealing plate (117). A through hole (120) is arranged inside the slider (119). A feeding nozzle (215) is fixedly installed at the first end of the T-shaped die (204). The feeding nozzle (215) is inserted into the through hole (120).

9. A method for producing synthetic paper, which uses the production device described in claim 8, is characterized in that, It includes the following steps: Step 1: Raw material pretreatment, drying and mixing one or more raw materials; Step 2: Melting and extrusion, putting the mixed raw materials into the extrusion device (1) for melting and extrusion; Step 3: Cast molding, the material flowing out from the extrusion device (1) enters the die assembly (2), and different T-dies (204) are selected according to requirements; Step 4: Biaxial stretching, preheat the tenter frame, adjust the stretching speed, conduct transverse and longitudinal stretching, and wind up.

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