Film blowing machine for reducing wafer points of PE (polyethylene) protective film and use method of film blowing machine

Abstract

The invention discloses a film blowing machine for reducing wafer points of a PE (polyethylene) protective film, which comprises a film blowing mechanism and a die head with a feeding pipe, the die head is provided with an air ring, and the film blowing mechanism is used for blow molding of the PE protective film; the discharging end of the extrusion mechanism communicates with the feeding pipe, and the extrusion mechanism is used for melting and conveying raw materials; the filtering mechanism comprises a communicating pipe communicating with the feeding pipe and the discharging end of the extruding mechanism, a fine filtering screen is detachably connected into the communicating pipe, the advancing direction of the raw materials in the communicating pipe is the first direction, and the fine filtering screen hunches up in the direction opposite to the first direction. Raw materials are melted through the extrusion mechanism and extruded into the film blowing mechanism, and finally the PE protective film is formed through blow molding of the film blowing mechanism. In the process, the molten raw materials are filtered through the filtering mechanism, and the impurity content in the raw materials is reduced, so that the number of crystal points of the PE protective film finished product is reduced, and the quality of the PE protective film produced by the film blowing machine is improved. The invention discloses a using method of a film blowing machine.

Description

Technical Field

[0001] The invention belongs to the technical field of film production, and in particular relates to a film blowing machine for reducing the number of crystal points of a PE protective film. Background Art

[0002] Fisheyes, also known as fisheyes, are relatively hard point defects that appear on the surface of films or other materials.

[0003] In the process of using film blowing machine to produce PE protective film, when the raw materials contain impurities or unstable components, these components are easy to form crystal points during the processing. Crystal points will destroy the flatness and smoothness of the material, affecting the appearance of the product; they will also cause stress concentration and reduce the mechanical strength and toughness of the material.

[0004] Therefore, it is necessary to improve the PE protective film blowing machine in the prior art. Summary of the invention

[0005] One of the purposes of the present invention is to overcome the defects in the prior art and provide a film blowing machine for reducing the number of crystal points in a PE protective film, thereby improving the quality of the PE protective film produced by the film blowing machine.

[0006] To achieve the above object, the specific technical solution of the film blowing machine for reducing the number of crystal points of PE protective film of the present invention is as follows: A film blowing machine for reducing the number of crystal points of a PE protective film, comprising: A film blowing mechanism, comprising a die head with a feed pipe, wherein the die head is provided with an air ring, and the film blowing mechanism is used for blow molding of a PE protective film; An extrusion mechanism, whose discharge end is connected to the feed pipe, and the extrusion mechanism is used to melt and transport the raw materials; The filtering mechanism comprises a connecting pipe connecting the feed pipe and the discharge end of the extrusion mechanism, wherein a fine filter screen is detachably connected inside the connecting pipe, and the forward direction of the raw material inside the connecting pipe is a first direction, and the fine filter screen is arched in the opposite direction of the first direction.

[0007] Preferably, in order to improve the filtering effect on the raw materials, a coarse filter screen is further provided in the connecting pipe, the mesh number of the coarse filter screen is lower than the mesh number of the fine filter screen, and the coarse filter screen and the fine filter screen are distributed in sequence along the first direction.

[0008] Preferably, in order to further improve the filtering effect on the raw material, the coarse filter screen is arched toward the first direction, and the coarse filter screen and the fine filter screen abut against each other and form an extrusion relationship.

[0009] Preferably, in order to improve the convenience of disassembly and assembly of the fine filter and the coarse filter, the inner wall of the connecting pipe is coaxially fixedly connected with an annular mounting seat, and both ends of the mounting seat are coaxially fixedly connected with fixing rings by screws, and the four peripheral edges of the fine filter and the coarse filter are respectively fixedly connected between the mounting seat and the two fixing rings.

[0010] Preferably, in order to improve the sealing effect between the coarse filter screen and the fine filter screen and the connecting pipe, sealing rings are circumferentially arranged on the four sides of the coarse filter screen and the fine filter screen, and the edges of the coarse filter screen and the fine filter screen are buried in the sealing rings.

[0011] Preferably, in order to reduce the extrusion pressure of a single extrusion mechanism and reduce the pressure on the coarse filter screen and the fine filter screen, the die head has a plurality of feed pipes, each of which is connected to an extrusion mechanism.

[0012] Preferably, in order to melt the raw materials and extrude them into the die head, the extrusion mechanism includes a feed pipe and a screw coaxially arranged inside the feed pipe, the front end of the feed pipe is connected to the connecting pipe, a hopper is arranged at the end of the feed pipe, the feed pipe is also fixedly connected to a power part which is transmission-connected to the screw, and a heating component and a heat insulating cover covering the heating component are arranged on the outer periphery of the feed pipe.

[0013] Preferably, in order to reduce the backflow of molten raw materials and ensure the stability of the extrusion pressure of the extrusion mechanism, the forward direction of the raw materials along the inside of the feed pipe is the second direction, the feed pipe has a solid material segment, a semi-molten material segment and a molten material segment arranged in sequence along the second direction, and the heating component includes heaters circumferentially arranged on the periphery of the solid material segment, the semi-molten material segment and the molten material segment, respectively.

[0014] Preferably, in order to support the fine filter screen and ensure its filtering effect, a hollow support portion is fixedly connected to the inner side of the fixing ring.

[0015] The second object of the present invention is to overcome the defects in the prior art and provide a method for using a film blowing machine, comprising: Step 1, check the film blowing machine in the shutdown state to ensure that all parts of the film blowing machine are intact; Step 2, turn on the power of the film blowing machine, set the heating temperature of the solid material section to 60°C-110°C, the heating temperature of the semi-molten material section to 110°C-140°C, the heating temperature of the molten material section to 140°C-170°C, and preheat for 180min-240min; Step 3, adding the PE raw material into the film blowing machine, and the screw pushes the raw material through the solid material section, the semi-molten material section and the molten material section in sequence, and the PE raw material is converted from solid to liquid by heating; Step 4, the molten liquid PE raw material is filtered through a coarse filter and a fine filter in sequence to remove internal impurities, the mesh number of the coarse filter is 200-300 mesh, and the mesh number of the fine filter is 400-600 mesh; Step 5: The filtered PE raw material is extruded through a die head and cooled and shaped by an air ring to form a finished product.

[0016] The film blowing machine for reducing the number of crystal points in a PE protective film of the present invention has the following advantages: an extrusion mechanism melts the raw materials, and squeezes the raw materials into the interior of the film blowing mechanism, and finally the film blowing mechanism blows and forms the PE protective film; in this process, the molten raw materials are filtered by a filtering mechanism to reduce the impurity content therein, thereby reducing the number of crystal points in the finished PE protective film and improving the quality of the PE protective film produced by the film blowing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the film blowing machine of the present invention; Figure 2 It is a structural schematic diagram of the film blowing mechanism of the present invention; Figure 3 It is a structural schematic diagram of the extrusion mechanism of the present invention; Figure 4 It is a schematic diagram of the installation structure of the heater of the present invention; Figure 5 is a cross-sectional view of the extrusion mechanism of the present invention; Figure 6 It is a structural schematic diagram of the filtering mechanism of the present invention; Figure 7 It is a schematic diagram of the exploded structure of the filtering mechanism of the present invention; Figure 8 is a cross-sectional view of the filtering mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the fine filter screen of the present invention; Explanation of the markings in the figure: 1. film blowing mechanism; 101. air ring; 102. die head; 103. feed pipe; 2. extrusion mechanism; 201. heat shield; 202. screw; 203. feed pipe; 204. power part; 205. hopper; 206. molten material section; 207. semi-molten material section; 208. solid material section; 209. heater; 3. filtering mechanism; 301. connecting pipe; 302. fixing ring; 303. coarse filter screen; 304. support part; 305. mounting seat; 306. sealing ring; 307. fine filter screen. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] “Top surface”, “bottom surface” and “underside” are referenced to the normal use state of the film blowing machine and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0020] like Figure 1 and 2 As shown, a film blowing machine for reducing the number of crystal points of a PE protective film comprises: The film blowing mechanism 1 comprises a die head 102 having a feed pipe 103, the die head 102 is provided with an air ring 101, and the film blowing mechanism 1 is used for blow molding of a PE protective film; An extrusion mechanism 2, whose discharge end is connected to the feed pipe 103, and the extrusion mechanism 2 is used to melt and transport the raw materials; The filtering mechanism 3 includes a connecting pipe 301 connecting the feed pipe 103 and the discharge end of the extrusion mechanism 2. A fine filter screen 307 is detachably connected inside the connecting pipe 301. The forward direction of the raw material inside the connecting pipe 301 is the first direction, and the fine filter screen 307 is arched in the opposite direction of the first direction.

[0021] The above-mentioned film blowing machine can be used for the production of PE protective film, which plays a role in reducing the amount of impurities in the raw materials for the production of PE protective film and improving the quality of the PE protective film produced by the film blowing machine; when the film blowing machine is in use, the granular PE raw material is added to the inside of the extrusion mechanism 2, and the extrusion mechanism 2 heats and melts the raw material and then extrude it from its own discharge end into the inside of the film blowing mechanism 1, and the die head 102 extrudes the raw material into shape, and at the same time, the airflow generated by the air ring 101 cools and shapes the extruded raw material, and finally forms a finished PE protective film.

[0022] The discharge end of the extrusion mechanism 2 is connected to the feed pipe 103 through a connecting pipe 301. When the molten raw material passes through the connecting pipe 301, the raw material is filtered through a fine filter screen 307 to reduce the content of impurities in the raw material, thereby reducing the number of crystal points of the PE protective film product and improving the quality of the PE protective film product produced by the film blowing machine.

[0023] In order to improve the filtering effect of the fine filter 307, the mesh number of the fine filter 307 is relatively high, and because the molten PE raw material has a certain viscosity, when the raw material passes through the fine filter 307, the fine filter 307 will produce a large resistance to the raw material, so the fine filter 307 must also withstand a large pressure. Under the action of pressure, the fine filter 307 will arch in the first direction, and the mesh size of the arched part of the fine filter 307 will become larger after being stretched, resulting in a decrease in the filtering effect of the fine filter 307 on the raw material. In view of the above problems, the fine filter 307 is set, so that the fine filter 307 is in a state of arching in the opposite direction of the first direction in the initial state. In this way, when the raw material passes through the fine filter 307, the fine filter 307 can be under the action of the raw material pressure. After the fine filter screen 307 is restored to a state close to being straight or flat, the mesh openings of the fine filter screen 307 shrink and return to a normal state. At this time, the fine filter screen 307 can effectively filter the raw materials to ensure the filtering effect of the impurities inside the raw materials. By selecting fine filter screens 307 with different hardnesses, when the fine filter screen 307 is compressed and restored to a state close to being straight or flat, the reaction force generated by itself and the pressure generated by the raw materials on the fine filter screen 307 are in a balanced state, so that the fine filter screen 307 can always maintain a state close to being straight or flat when filtering the raw materials, making the mesh openings of the fine filter screen 307 more uniform, thereby ensuring the filtering effect of the fine filter screen 307 on the raw materials.

[0024] A further improvement is, Figure 6-8 As shown, a coarse filter 303 is also provided in the connecting pipe 301, and the mesh number of the coarse filter 303 is lower than the mesh number of the fine filter 307, and the coarse filter 303 and the fine filter 307 are sequentially distributed along the first direction. When the molten raw material passes through the connecting pipe 301, the raw material is firstly filtered by the coarse filter 303 to reduce the number of large particle impurities in the raw material, and then the raw material is filtered again by the fine filter 307 to remove small particle impurities in the raw material, thereby ensuring the filtering effect of the raw material; the raw material is initially filtered by the coarse filter 303, which can effectively reduce the number of impurities in the raw material, thereby reducing the pressure of the fine filter 307 to filter the raw material; compared with only setting the fine filter 307, setting a double-layer filter can reduce the accumulation of impurities on a single filter, thereby extending the effective use time of the filter, reducing the number of times the filter is maintained during the service life of the filter, and improving the production efficiency of the film blowing machine.

[0025] In the above-mentioned film blowing machine, the mesh number of the coarse filter is 200-300 mesh, the mesh number of the fine filter is 400-600 mesh, the operation of the extrusion mechanism 2 is divided into a startup stage and a normal operation stage, and the extrusion pressure of the extrusion mechanism 2 is 25MPa-35MPa; the fine filter 307 is in an arched state during the startup stage of the extrusion mechanism 2, at which time the arched part of the fine filter 307 has a larger mesh after stretching, and when the molten raw material initially contacts the fine filter 307, the raw material cannot generate enough pressure on the fine filter 307 to transform the fine filter 307 into a straight state, so that the impurities inside the raw material cannot be effectively filtered, resulting in the fine filter 307 being unable to achieve the expected filtering effect on the raw material; in order to solve the above-mentioned problems, it is preferred that Figure 8 As shown, the coarse filter screen 303 is arched toward the first direction, and the coarse filter screen 303 and the fine filter screen 307 abut against each other and form an extrusion relationship. During the startup phase, the extrusion mechanism 2 uses the coarse filter 303 to support and squeeze the arched portion of the fine filter 307, causing the arched portion of the fine filter 307 to retract, thereby reducing the mesh size of the fine filter 307, so that the fine filter 307 can effectively filter the molten raw material that passes through first, thereby ensuring the filtering effect on the molten raw material and improving the quality of the PE protective film produced by the film blowing machine; when the extrusion mechanism 2 is in the normal operation phase, the coarse filter 303 is still in an arched state, which can increase the filtering area of ​​the coarse filter 303 and improve the filtering speed of the initial filtration of the raw material. At this time, the elastic force generated by the deformation of the fine filter 307 itself and the pressure generated by the raw material on the fine filter 307 are in a balanced state, so that the fine filter 307 remains in a straight state, thereby restoring the mesh size of the fine filter 307 to a normal size, thereby ensuring the filtering effect of the fine filter 307 on the raw material.

[0026] A further improvement is, Figure 7 and 8 As shown, the inner wall of the connecting pipe 301 is coaxially fixedly connected with an annular mounting seat 305, and both ends of the mounting seat 305 are coaxially fixedly connected with a fixing ring 302 through screws, and the four edges of the fine filter screen 307 and the coarse filter screen 303 are respectively fixedly connected between the mounting seat 305 and the two fixing rings 302. The mounting seat 305 is provided with threaded holes distributed along the axial direction, and the fixing ring 302 is provided with mounting holes distributed along the axial direction. The screws pass through the mounting holes and are connected with the threaded holes to achieve a fixed connection between the fixing ring 302 and the mounting seat 305. The edges of the fine filter screen 307 and the coarse filter screen 303 are clamped by the fixing ring 302 and the mounting seat 305, thereby improving the convenience of disassembly, assembly and replacement of the filter screen; when the screws pass through the edges of the filter screen, the firmness of the filter screen installation can be improved, the probability of the filter screen falling off during use is reduced, and the filtering effect of the filter screen on the raw material is guaranteed.

[0027] A further improvement is, Fig. 9As shown, the edges of the coarse filter 303 and the fine filter 307 are all circumferentially provided with sealing rings 306, and the edges of the coarse filter 303 and the fine filter 307 are buried in the sealing rings 306. The sealing ring 306 is a rubber ring, and the edge of the filter buried inside the sealing ring 306 can be used as the internal skeleton of the sealing ring 306 to improve the connection strength between the sealing ring 306 and the filter; under the action of the sealing ring 306, the sealing performance between the filter and the mounting seat 305 and the fixing ring 302 can be improved to prevent the leakage of the raw material and improve the filtering effect on the raw material; and the friction between the filter and the mounting seat 305 and the fixing ring 302 can be increased, further improving the firmness of the filter installation.

[0028] A further improvement is, Figure 1 As shown, the die head 102 has a plurality of feed pipes 103, and each feed pipe 103 is connected to an extrusion mechanism 2. When the feed amount of the die head 102 remains unchanged, by providing a plurality of extrusion mechanisms 2, the discharge amount of a single extrusion mechanism 2 can be reduced, thereby reducing the extrusion pressure of a single extrusion mechanism 2 while ensuring stable material feeding, so as to reduce the force applied to the fine filter screen 303, reduce the deformation of the fine filter screen 303, and improve the filtering effect of the fine filter screen 303.

[0029] A further improvement is, Figure 3-5 As shown, the extrusion mechanism 2 includes a feed pipe 203 and a screw 202 coaxially arranged inside the feed pipe 203, the front end of the feed pipe 203 is connected to the connecting pipe 301, the end of the feed pipe 203 is provided with a hopper 205, the feed pipe 203 is also fixedly connected to a power part 204 that is transmission-connected to the screw 202, and the periphery of the feed pipe 203 is provided with a heating component and a heat insulating cover 201 covering the heating component. When the extrusion mechanism 2 is in use, granular PE raw materials are put into the hopper 205 and fall into the inside of the conveying pipe 203 through the hopper 205; the power part 204 includes a gear box and a motor, and the motor outputs power to the screw 202 through the gear box, and the screw 202 pushes the raw materials forward in the conveying pipe 203; at the same time, the raw materials are heated and melted by the heating component, and finally the molten raw materials are output from one end of the conveying pipe 203 to complete the transportation of the raw materials; the heat insulation cover 201 is set to isolate the heating component to prevent the heating component from scalding workers and improve the safety of the equipment.

[0030] A further improvement is, Figure 4 and 5As shown, the forward direction of the raw material inside the feed pipe 203 is the second direction, the feed pipe 203 has a solid material segment 208, a semi-molten material segment 207 and a molten material segment 206 arranged in sequence along the second direction, and the heating component includes heaters 209 circumferentially arranged on the periphery of the solid material segment 208, the semi-molten material segment 207 and the molten material segment 206. In the above-mentioned film blowing machine, after the PE raw material enters the feed pipe 203, it passes through the three areas of solid material section 208, semi-molten material section 207 and molten material section 206 in sequence under the driving action of the screw 202. The heating temperature of the heater 209 arranged on the periphery of the solid material section 208 is lower than the melting temperature of the raw material, so that the raw material can be preheated in the process of passing through the solid material section 208, but the raw material is always in a solid state; the heating temperature of the heater 209 arranged on the periphery of the semi-molten material section 207 and the molten material section 206 is higher than the melting temperature of the PE raw material, so that the raw material begins to partially melt at the semi-molten section 207. At this time, the raw material is in a semi-solid and semi-molten state. It has a certain fluidity; and when the raw material enters the melting section 206, the heater 209 needs to heat the raw material to make it completely melted; since the solid raw material has poor fluidity and the molten raw material has good fluidity, when the screw 202 pushes the solid raw material, the solid raw material can move forward steadily and is difficult to flow back inside the clinker tube 203, so that the solid raw material can produce a greater thrust on the raw material in the molten state in front, so that the molten raw material has sufficient extrusion pressure; and the solid raw material at the rear can block the molten raw material in the front to prevent the molten raw material from flowing back to the rear, further ensuring the stability of the extrusion pressure of the extrusion mechanism 2 and improving the quality of the PE protective film produced by the touch machine.

[0031] A further improvement is, Figure 6 and 7 As shown, a hollow support part 304 is fixedly connected to the inner side of the fixing ring 302. The support part 304 includes cross-arranged support rods. When the fine filter screen 307 is squeezed to a straight state under the pressure of the raw material, the fine filter screen 307 can be supported by the support part 304 to keep it in a straight state, thereby ensuring the filtering effect of the fine filter screen 307 on the raw material; and the setting of the support part 304 can also support the fine filter screen 307 when the extrusion pressure of the raw material suddenly increases, so as to prevent the fine filter screen 307 from arching in the opposite direction of the original arching direction, so as to maintain the continuous and stable filtering effect of the fine filter screen 307 on the raw material, and finally improve the quality of the PE protective film produced by the film blowing machine.

[0032] A method for using a film blowing machine includes: Step 1: Check the film blowing machine in the shutdown state to ensure that all parts of the film blowing machine are in good condition; Step 2, turn on the power of the film blowing machine, set the heating temperature of the solid material segment 208 to 60°C-110°C, the heating temperature of the semi-molten material segment 207 to 110°C-140°C, the heating temperature of the molten material segment 206 to 140°C-170°C, and preheat for 180min-240min; Step 3, adding PE raw material into the film blowing machine, and the screw 202 pushes the raw material through the solid material section 208, the semi-molten material section 207 and the molten material section 206 in sequence, and the PE raw material is converted from solid to liquid by heating; Step 4, the molten liquid PE raw material is filtered through a coarse filter 303 and a fine filter 307 in sequence to remove internal impurities, the mesh number of the coarse filter 303 is 200-300 mesh, and the mesh number of the fine filter 307 is 400-600 mesh; Step 5, the filtered PE raw material is extruded by the die head 102 and cooled and shaped by the air ring 101 to form a finished product.

[0033] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A film blowing machine for reducing the number of crystal points of PE protective film, characterized in that: include: A film blowing mechanism (1) comprises a die head (102) having a feed pipe (103), the die head (102) being provided with an air ring (101), and the film blowing mechanism (1) is used for blow molding of a PE protective film; An extrusion mechanism (2), the discharge end of which is in communication with the feed pipe (103), the extrusion mechanism (2) being used to melt and transport the raw material; The filtering mechanism (3) comprises a connecting pipe (301) connecting the feed pipe (103) and the discharge end of the extrusion mechanism (2), a fine filter screen (307) being detachably connected inside the connecting pipe (301), the forward direction of the raw material inside the connecting pipe (301) being a first direction, and the fine filter screen (307) being arched in a direction opposite to the first direction.

2. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 1, characterized in that: A coarse filter screen (303) is also provided in the connecting pipe (301), the mesh number of the coarse filter screen (303) is lower than the mesh number of the fine filter screen (307), and the coarse filter screen (303) and the fine filter screen (307) are sequentially distributed along the first direction.

3. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 2, characterized in that: The coarse filter screen (303) is arched in the first direction, and the coarse filter screen (303) and the fine filter screen (307) abut against each other and form an extrusion relationship.

4. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 3, characterized in that: An annular mounting seat (305) is coaxially fixedly connected to the inner wall of the connecting pipe (301), and both ends of the mounting seat (305) are coaxially fixedly connected to fixing rings (302) via screws, and the four peripheral edges of the fine filter screen (307) and the coarse filter screen (303) are respectively fixedly connected between the mounting seat (305) and the two fixing rings (302).

5. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 4, characterized in that: Sealing rings (306) are circumferentially arranged on the four sides of the coarse filter screen (303) and the fine filter screen (307); the edges of the coarse filter screen (303) and the fine filter screen (307) are embedded in the sealing rings (306).

6. The film blowing machine for reducing the number of crystal points of PE protective film according to any one of claims 2 to 5, characterized in that: The die head (102) has a plurality of feed pipes (103), and each of the feed pipes (103) is connected to an extrusion mechanism (2).

7. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 6, characterized in that: The extrusion mechanism (2) comprises a feed pipe (203) and a screw (202) coaxially arranged inside the feed pipe (203); the front end of the feed pipe (203) is connected to the connecting pipe (301); a hopper (205) is arranged at the end of the feed pipe (203); the feed pipe (203) is also fixedly connected to a power member (204) drivingly connected to the screw (202); and a heating component and a heat insulation cover (201) covering the heating component are arranged on the outer periphery of the feed pipe (203).

8. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 7, characterized in that: The forward direction of the raw material inside the feed pipe (203) is a second direction, the feed pipe (203) has a solid material segment (208), a semi-molten material segment (207) and a molten material segment (206) arranged in sequence along the second direction, and the heating component includes heaters (209) respectively arranged circumferentially on the outer peripheries of the solid material segment (208), the semi-molten material segment (207) and the molten material segment (206).

9. The film blowing machine for reducing the number of crystal points of PE protective film according to claim 4, characterized in that: A hollow support portion (304) is fixedly connected to the inner side of the fixing ring (302).

10. A method for using a film blowing machine is applicable to the film blowing machine according to claim 8, characterized in that: include: Step 1: Check the film blowing machine in the shutdown state to ensure that all parts of the film blowing machine are in good condition; Step 2, turning on the power of the film blowing machine, setting the heating temperature of the solid material section (208) to 60°C-110°C, the heating temperature of the semi-molten material section (207) to 110°C-140°C, the heating temperature of the molten material section (206) to 140°C-170°C, and preheating for 180min-240min; Step 3, adding the PE raw material into the film blowing machine, and the screw (202) pushes the raw material through the solid material section (208), the semi-molten material section (207) and the molten material section (206) in sequence, and the PE raw material is converted from solid to liquid by heating; Step 4, the molten liquid PE raw material is filtered through a coarse filter (303) and a fine filter (307) in sequence to remove internal impurities, the mesh number of the coarse filter (303) is 200-300 mesh, and the mesh number of the fine filter (307) is 400-600 mesh; Step 5, the filtered PE raw material is extruded through the die head (102) and cooled and shaped through the air ring (101) to form a finished product.

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