An integrated production system for PE film casting, processing and recycling

Abstract

The present invention relates to a PE film cast molding processing and recycling integrated production system in the field of plastic film production technology, comprising an extrusion device, wherein the extrusion device is composed of an extruder, a T-die, and a feed hopper. Polyethylene particles are fed into the extruder through the feed hopper and then molten polyethylene is extruded through the T-die. A cooling device is provided on one side for cooling the molten polyethylene. The molten polyethylene is cooled and formed by the cooling device to form a PE film. The present invention is based on an existing cooling roller, combining the cooling roller with a hollow cooling plate so that cooling water can circulate on both sides of the molten polyethylene, achieving the purpose of cooling the molten polyethylene from both sides at the same time. On the one hand, it can increase the molding rate of the PE film, and on the other hand, it can reduce the temperature difference between the two sides of the PE film to prevent the final molding quality of the PE film from being affected by the thermal stress difference between the two sides of the PE film. The present invention combines the recovery of the PE film with the production and processing of the PE film, and can recycle the PE film in a timely manner.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic film production, in particular to a PE film casting molding processing and recycling integrated production system. Background Art

[0002] PE film, or polyethylene film for short, is a widely used protective film made of polymer materials. It has good flexibility, adhesion, is easy to stick and peel, and leaves no adhesive residue when peeled. The main function of PE film is to protect products from contamination, corrosion, and scratches during production, processing, transportation, storage, and use, thereby improving product quality and market competitiveness. There are two main manufacturing processes for PE film: blow molding and cast film. The cast film method involves heating a thermoplastic resin to a molten state through an extruder, and then extruding it through a mold of a specific shape to form a film. Subsequently, the film is cooled and wound into a roll for further processing or use. PE films produced using the cast film method are characterized by uniform thickness, good surface gloss, transparency, and heat sealing properties, as well as high production speeds. Therefore, this method is now widely used in the production of PE films.

[0003] The molding equipment for manufacturing PE film by cast film method generally includes an extruder, a cooling device, a trimming device and a winding device. The molten polyethylene material is cooled and formed by the cooling device. The cooling device commonly used in the prior art is mostly a cooling roller, as shown in the prior art of publication number CN110561774A, publication number CN113524542A, and publication number CN117325363A. The main function of the known cooling roller is to take away the heat from the surface of the material through its internal cooling water circulation system, thereby achieving rapid cooling. That is to say, the film and the cooling roller are closely connected. The contact side can achieve rapid cooling, and the temperature reduction rate of the other side of the film is lower than the side directly in contact with the cooling roller, which will lead to differences in thermal stress and deformation on the two sides of the PE film. Although two cooling rollers are respectively provided in the prior art CN110561774A, CN113524542A and CN117325363A to cool the two sides of the film, when the film contacts one of the cooling rollers, only one side of the film is in contact with the cooling roller, resulting in a temperature difference between the two sides of the film. The above problem has not yet been solved.

[0004] In addition, in the prior art, the excess PE film cut off by the trimming device is not properly stored and needs to be cleaned in advance before it can be used during recycling, which easily increases the recycling cost of the PE film. Summary of the Invention

[0005] In order to solve the problems raised in the above background art, such as the temperature difference between the two sides of the PE film during the cooling process, the inability to timely recycle the cut PE film, and the high recycling cost, the present invention provides the following technical solutions:

[0006] A PE film casting processing and recycling integrated production system includes an extrusion device, which is composed of an extruder, a T-die and a feed hopper. Polyethylene particles are fed into the extruder through the feed hopper and then molten polyethylene is extruded through the T-die. A cooling device is provided on one side of the extruder for cooling the molten polyethylene. The molten polyethylene is cooled and formed into a PE film after being cooled by the cooling device.

[0007] The cooling device includes two cooling rollers rotating in opposite directions, one cooling roller is located at the bottom of the T-die, and the other cooling roller is at the same height as the T-die and located on the side of the T-die. A chiller is provided on the rear side of the two cooling rollers for supplying low-temperature cooling water to the interior of the cooling rollers. The outer ends of the two cooling rollers are provided with an outer cooling assembly for cooling the molten polyethylene from the outside.

[0008] The cooling device is away from the extrusion device on the side of the winding device for winding the PE film. The formed PE film is cut into different widths by the slitting and recycling device, and the cut PE film is directly recycled into the feed hopper for reuse by the slitting and recycling device.

[0009] Furthermore, the outer cooling assembly includes an arc-shaped plate covering the outside of the two cooling rollers, and a hollow cold conduction plate is fixed on the inner side of each arc-shaped plate. A portion of the low-temperature cooling water output by the chiller enters the interior of the hollow cold conduction plate from one end of the hollow cold conduction plate located at a high position, and is used to cool the other side of the molten polyethylene when the molten polyethylene contacts the cooling roller. The cooling water after the temperature is increased inside the cooling roller flows into the interior of the hollow cold conduction plate through the cooling roller outlet pipe and is discharged to the interior of the chiller together with the cooling water after the temperature is increased in the hollow cold conduction plate for cooling.

[0010] Furthermore, the rear ends of the two cooling rollers are connected to cooling roller water inlet pipes, and the tops of the rear sides of the two hollow cold guide plates are fixedly connected to cold guide plate water inlet pipes. The cooling roller water inlet pipes and the cold guide plate water inlet pipes are connected to the cold water outlet of the chiller through the cold water pipe;

[0011] The rear bottom of the two hollow cooling plates are connected to a cooling plate water outlet pipe, and the cooling roller water outlet pipe is connected to the inner cavity of the bottom end of the hollow cooling plate. The ends of the two cooling plate water outlet pipes away from the cooling roller are connected to the hot water inlet of the chiller through a hot water pipe.

[0012] Furthermore, the cooling roller at the bottom of the T-die rotates counterclockwise, and the cooling roller at the same height as the T-die rotates clockwise;

[0013] Two rollers are respectively provided at both ends of the two hollow cooling plates. Both rollers are located outside the cooling roller and in the opposite direction of rotation of the cooling roller. The front and rear ends of the arc plate are respectively connected to baffles through bearings. An arc plate is fixed between the two baffles. The side of the hollow cooling plate away from the cooling roller is fixed to the inner wall of the arc plate.

[0014] Furthermore, the winding device includes a winding guide roller that rotates counterclockwise, and the winding guide roller is located at the bottom of the cooling roller at the same height as the T-die head. A winding roller group is provided on one side of the winding guide roller, and the winding roller group is fixed by a support plate. A winding roller for winding the PE film is provided on the side of the winding roller group away from the winding guide roller. The winding roller rotates clockwise, and the formed PE film is wound at the outer end of the winding roller through the winding guide roller and the winding roller group.

[0015] Furthermore, a cabinet is provided on the rear side of the support plate.

[0016] Furthermore, the slitting and recycling device includes a slitting assembly, which is located on the side of the winding guide roller close to the extrusion device. The slitting assembly is fixed to the inner side of the support plate through a bracket. A recovery guide roller that rotates clockwise is provided on the bottom of the winding guide roller away from the extrusion device. A recovery roller group for conveying the cut PE film is provided at the bottom of the cooling roller and the bottom of the extruder;

[0017] One side of the feed hopper is connected to a recovery box, and a partition plate is fixed in the middle of the recovery box, and a rectangular through-hole is opened in the middle of the partition plate. The interior of the recovery box is divided into a front chamber and a rear chamber by the partition plate. The bottom of the rear chamber of the recovery box is rotatably connected to a conveyor roller with opposite rotating directions. The cut PE film passes through between the two conveyor rollers and moves upward. A partition is provided on the top of the conveyor roller, and a channel for the PE film to pass through is opened in the middle of the partition. A plurality of blades distributed at equal intervals are fixed inside the channel. The upward-moving PE film is cut into strips after contacting the blades. Two arc-shaped knives driven by a driving assembly and moving in opposite directions are provided on the top of the partition. The strip of PE film moves between the two arc-shaped knives and is cut into fragments by the arc-shaped knives. A blower for blowing air into the interior of the recovery box is installed on the rear side wall of the recovery box. The gas blown by the blower blows the fragmented PE film into the front chamber of the recovery box;

[0018] An inclined plate is fixed in the front cavity of the recycling box, and the fragmented PE film moved to the top of the inclined plate will move along the inclined surface of the inclined plate to the inside of the winding device for recycling.

[0019] Further, the drive assembly includes two guide rods fixed to the interior of the rear cavity of the recovery box, the guide rods passing through the two arc-shaped knives, for limiting the moving direction of the two arc-shaped knives;

[0020] A turntable is provided at the top of the rear cavity of the recycling box. The two sides of the bottom of the turntable are hinged to the middle of the tops of the two arc-shaped knives through connecting rods. A rotating shaft is fixed in the middle of the connecting rod. The top of the rotating shaft passes through the recycling box and extends out of the top of the recycling box. The top of the rotating shaft is driven by a gear rack transmission and rotates back and forth in an arc of 90°. The gear in the gear rack transmission is an incomplete gear, and the number of teeth of the incomplete gear is one-fourth the number of teeth of the complete gear.

[0021] Furthermore, the slitting assembly includes a slitting knife, the blade head of the slitting knife is tangent to the outer wall of the winding guide roller, and the side of the slitting knife away from the winding guide roller is provided with an electric push rod b for driving the slitting knife away from or close to the winding guide roller, and the electric push rod b and one side of the slitting knife are provided with an electric push rod a for driving the slitting knife to move along the central axis of the winding guide roller.

[0022] Furthermore, the extruder is placed on the ground via an extruder frame, and the recovery roller set is installed inside the extruder frame.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Compared with the traditional cooling roller that can only cool one side of the PE film, the present invention starts from the existing cooling roller and combines the cooling roller with a hollow cooling plate, so that cooling water can circulate on both sides of the molten polyethylene, thereby achieving the purpose of cooling the molten polyethylene from both sides at the same time. On the one hand, it can increase the forming rate of the PE film, and on the other hand, it can reduce the temperature difference between the two sides of the PE film to prevent the final forming quality of the PE film from being affected by the thermal stress difference between the two sides of the PE film.

[0025] The present invention can utilize the slitting and recycling device to recycle the excess PE film that has been slit while processing the PE film. The recycled PE film is directly put into the feed hopper for PE film production, which is beneficial to improving the utilization rate of the PE film raw material. By utilizing the winding roller group and the recycling roller group to transport the finished PE film and the cut PE film in two directions respectively, the recycling of the PE film is combined with the production and processing of the PE film, enriching the functions of the present invention, achieving timely recycling of the PE film, and realizing the purpose of saving the cleaning process and reducing the recycling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A top view of the present invention;

[0027] Figure 2 It is a rear view of the present invention;

[0028] Figure 3 This is a front view of the present invention after removing the front support plate;

[0029] Figure 4This is a schematic diagram of the structure of the cooling water pipe, the cooling roller water inlet pipe and the chiller of the present invention;

[0030] Figure 5 This is a schematic structural diagram of the cooling roller water outlet pipe and the cooling roller of the present invention;

[0031] Figure 6 is a cross-sectional view of two hollow cooling plates of the present invention;

[0032] Figure 7 This is a rear view of the present invention after removing the rear support plate;

[0033] Figure 8 For the present invention Figure 7 A magnified view of middle A;

[0034] Figure 9 It is a structural schematic diagram of the slitting assembly of the present invention;

[0035] Figure 10 It is a structural schematic diagram of the feed hopper and recovery box of the present invention;

[0036] Figure 11 This is a schematic diagram of the connection position between the feed hopper and the recovery box of the present invention;

[0037] Figure 12 is a cross-sectional view of the feed hopper and recovery box of the present invention;

[0038] Figure 13 It is a structural schematic diagram of the drive assembly of the present invention;

[0039] Figure 14 For the present invention Figure 13 Bottom view of .

[0040] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0041] 1. Extrusion device; 11. Extruder; 12. T-die; 13. Feed hopper; 14. Extruder frame;

[0042] 2. Cooling device; 21. Cooling roller; 22. External cooling assembly; 23. Chiller; 24. Cold water pipe; 25. Cooling roller water inlet pipe; 26. Cooling roller water outlet pipe; 27. Hot water pipe;

[0043] Curved plate; 2202, baffle; 2203, hollow cooling plate; 2204, cooling plate water inlet pipe; 2205, cooling plate water outlet pipe; 2206, roller;

[0044] 3. Winding device; 31. Winding guide roller; 32. Winding roller assembly; 33. Winding roller; 34. Roller support plate; 35. Cabinet;

[0045] 4. Slitting and recycling device; 41. Slitting assembly; 42. Recycling guide roller; 43. Recycling roller assembly; 44. Conveying roller; 45. Recycling box; 46. Partition; 47. Curved knife; 48. Drive assembly; 49. Blower; 410. Separator; 411. Inclined plate; 412. Blade;

[0046] 4101, slitting knife; 4102, electric push rod a; 4103, electric push rod b;

[0047] 4801, guide rod; 4802, turntable; 4803, connecting rod; 4804, rotating shaft; 4805, rack and pinion transmission part. DETAILED DESCRIPTION

[0048] The following describes in detail the preferred embodiments of the present invention, and provides a clear and complete description in conjunction with the accompanying drawings.

[0049] See also Figure 1 and 2 The present invention provides an integrated production system for PE film cast molding processing and recycling, including an extrusion device 1, which is composed of an extruder 11, a T-die 12 and a feed hopper 13. The extruder 11 is erected on the ground through an extruder frame 14. Polyethylene particles are put into the extruder 11 through the feed hopper 13 and then molten polyethylene is extruded through the T-die 12. In addition, in order to facilitate loading, a staircase platform is provided on the rear side of the extruder 11 for the convenience of staff climbing. This setting can also facilitate staff to observe whether there is material blockage inside the feed hopper 13, so that the staff can take remedial measures in time.

[0050] The molten polyethylene extruded through the T-die 12 needs to be cooled before it can form a sheet-like PE film. To achieve this purpose, a cooling device 2 for cooling the molten polyethylene is provided on one side of the extruder 1. The molten polyethylene is cooled and formed into a PE film after being cooled by the cooling device 2. Specifically, Figure 3-6 As shown, the cooling device 2 of the present invention includes two cooling rollers 21 with opposite rotation directions, one cooling roller 21 is located at the bottom of the T-die 12, and the other cooling roller 21 is at the same height as the T-die 12 and is located on one side of the T-die 12. The cooling roller 21 at the bottom of the T-die 12 rotates counterclockwise, and the cooling roller 21 at the same height as the T-die 12 rotates clockwise. The different rotation directions allow the PE film to be rolled between the two cooling rollers 21. Figure 3The film is conveyed in the manner shown. A chiller 23 is installed behind the two cooling rollers 21 to supply low-temperature cooling water to the interior of the cooling rollers 21. Similar to the prior art, the present invention utilizes the cooling rollers 21, which have low-temperature cooling water flowing through them, to cool the molten polyethylene to aid in its molding. However, unlike the prior art, the present invention features external cooling assemblies 22 at the outer ends of both cooling rollers 21 to cool the molten polyethylene from the outside. The cooling device 2 of the present invention can simultaneously cool both sides of the PE film, reducing the temperature difference between the two sides of the PE film and thus preventing the impact of thermal stress differences on the two sides of the PE film on the molding quality.

[0051] like Figure 3-6 As shown, the outer cooling assembly 22 of the present invention includes an arc-shaped plate 2201 covering the outside of the two cooling rollers 21, a hollow cold conduction plate 2203 is fixed on the inner side of each arc-shaped plate 2201, two rollers 2206 are respectively provided at both ends of the two hollow cold conduction plates 2203, the two rollers 2206 are both located outside the cooling roller 21 and rotate in the opposite direction of the cooling roller 21, the front and rear ends of the arc-shaped plate 2201 are respectively connected to the baffle 2202 through bearings, the arc-shaped plate 2201 is fixed between the two baffles 2202, and the side of the hollow cold conduction plate 2203 away from the cooling roller 21 is connected to the arc-shaped plate 2201. The inner wall of the cooling plate 2201 is fixed. Since the temperature of the molten polyethylene in contact with the upper part of the cooling roller 21 is relatively high, the temperature of the molten polyethylene that moves to the lower part of the cooling roller 21 following the rotation of the cooling roller 21 has been reduced under the cooling effect of the cooling roller 21. Therefore, the present invention allows a part of the low-temperature cooling water output by the chiller 23 to enter the interior of the hollow cooling plate 2203 from one end of the hollow cooling plate 2203 located at a high position, and the heated cooling water is then discharged through the bottom end of the hollow cooling plate 2203. In this way, the cooling water with a lower temperature can first cool the molten polyethylene with a higher temperature, thereby improving the cooling effect. Figure 6 It can also be seen that multiple baffles are fixed inside each hollow cooling plate 2203, so that the water flow can flow in a curved shape inside the hollow cooling plate 2203, extending the residence time of the cooling water inside the hollow cooling plate 2203, thereby further improving the cooling effect. The hollow cooling plate 2203 provided in the present invention can cool the other side of the molten polyethylene when it contacts the cooling roller 21, thereby reducing the temperature difference between the two sides of the PE film.

[0052] Furthermore, the rear ends of the two cooling rollers 21 are connected with cooling roller water inlet pipes 25, the tops of the rear sides of the two hollow cooling plates 2203 are fixedly connected with cooling plate water inlet pipes 2204, the cooling roller water inlet pipes 25 and the cooling plate water inlet pipes 2204 are connected with the cold water outlet of the chiller 23 through the cold water pipe 24, the bottoms of the rear sides of the two hollow cooling plates 2203 are connected with cooling plate water outlet pipes 2205, the cooling roller water outlet pipe 26 is connected with the inner cavity of the bottom end of the hollow cooling plate 2203, and the ends of the two cooling plate water outlet pipes 2205 away from the cooling roller 21 are connected with the cooling roller 21 through the hot water pipe 27. The hot water input port of the water machine 23 is connected, and the cooling water heated inside the cooling roller 21 flows into the hollow cooling plate 2203 through the cooling roller outlet pipe 26 and is discharged to the inside of the chiller 23 together with the cooling water heated in the hollow cooling plate 2203 for cooling. The cooling water source of the hollow cooling plate 2203 in the present invention is the same as the cooling water source inside the cooling roller 21, so that the hollow cooling plate 2203 can utilize the water circulation pipeline of the cooling roller 21. On the one hand, it can improve the utilization efficiency of cooling water, and on the other hand, it can reduce the use cost and manufacturing cost of the present invention, killing two birds with one stone.

[0053] It is worth noting that the present invention controls the flow rate and pressure of cooling water to ensure that the amount of water entering and exiting the cooling roller 1 and the hollow cooling plate 2203 is consistent, so that the inside of the cooling roller 1 and the inside of the hollow cooling plate 2203 are filled with sufficient cooling water, ensuring that the cooling water can fully cover the roller surface of the cooling roller 1, avoiding uneven temperature due to insufficient or excessive cooling, and avoiding affecting the molding quality of the PE film.

[0054] After being cooled by the cooling device 2, the molten polyethylene is formed into a PE film. A winding device 3 is provided on the side of the cooling device 2 away from the 1 for winding the PE film. During the winding process, the PE film is cut into different widths by the slitting and recycling device 4 to meet different usage requirements. Specifically, Figure 3 and 7 As shown, the winding device 3 includes a winding guide roller 31 that rotates counterclockwise. The winding guide roller 31 is located at the bottom of the cooling roller 21 at the same height as the T-die 12. A winding roller group 32 is provided on one side of the winding guide roller 31. The winding roller group 32 is fixed by a support plate 34. A cabinet 35 is provided on the rear side of the support plate 34. The driving equipment for driving the cooling roller 21, the rotating roller 2206, the winding guide roller 31 and the winding roller group 32 to rotate are all installed inside the cabinet 35. A winding roller 33 for winding the PE film is provided on the side of the winding roller group 32 away from the winding guide roller 31. The winding roller 33 rotates clockwise, and the formed PE film is wound at the outer end of the winding roller 33 through the transmission of the winding guide roller 31 and the winding roller group 32.

[0055] In addition, in the above process, the PE film cut by the slitting and recycling device 4 will also be directly recycled into the feed hopper 13 through the slitting and recycling device 4 for utilization, realizing the simultaneous processing and recycling of the PE film, which helps to save raw materials and improve processing efficiency. Specifically, Figure 7-14 As shown, the slitting and recycling device 4 in the present invention includes a slitting assembly 41, which is located on the side of the winding guide roller 31 close to the extrusion device 1. The slitting assembly 41 is fixed to the inner side of the support plate 34 by a bracket. The slitting assembly 41 includes a slitting knife 4101, and the blade head of the slitting knife 4101 is tangent to the outer wall of the winding guide roller 31. The side of the slitting knife 4101 away from the winding guide roller 31 is provided with an electric push rod b4103 for driving the slitting knife 4101 away from or close to the winding guide roller 31. The electric push rod b4103 and the side of the slitting knife 4101 are provided with an electric push rod a4102 for driving the slitting knife 4101 to move along the central axis of the winding guide roller 31. By controlling the electric push rod a4102 and the electric push rod b4103, the formed rear side PE film can be cut into different widths;

[0056] In order to be able to recover the cut PE film in time, a clockwise rotating recovery guide roller 42 is provided at the bottom of the winding guide roller 31 on the side away from the extruder 1. A recovery roller group 43 for conveying the cut PE film is provided at the bottom of the cooling roller 21 and the bottom of the extruder 11. The recovery roller group 43 is installed inside the extruder frame 14. The clockwise rotating recovery guide roller 42 can convey the cut PE film in a direction away from the extruder 1.

[0057] A recycling box 45 is connected to one side of the feed hopper 13. A partition plate 410 is fixed in the middle of the recycling box 45. A rectangular through-hole is opened in the middle of the partition plate 410. The interior of the recycling box 45 is divided into a front chamber and a rear chamber by the partition plate 410. The bottom of the rear chamber of the recycling box 45 is rotatably connected to a conveying roller 44 with opposite rotation directions. Under the conveying action of the recycling guide roller 42 and the recycling roller group 43, the cut PE film can be conveyed to the bottom of the two conveying rollers 44. Then, the rotating conveying roller 44 drives the PE film to pass through between the two conveying rollers 44 and move upward;

[0058] It is known that the polyethylene raw materials in the feed hopper 13 are all in granular form, so the whole piece of PE film needs to be cut and crushed, such as Figure 8 As shown, a partition 46 is provided on top of the conveyor roller 44. A channel is defined in the middle of the partition 46 for the PE film to pass through. A plurality of equally spaced blades 412 are fixed inside the channel. Two arc-shaped knives 47 driven by a drive assembly 48 and moving in opposite directions are provided on top of the partition 46. Under the conveyance of the two conveyor rollers 44, the upwardly moving PE film first contacts the blades 412 and is cut into strips. Then, the strip of PE film moves between the two arc-shaped knives 47 and is cut into fragments by the arc-shaped knives 47.

[0059] Then, under the action of the blower 49 on the rear side wall of the recovery box 45, the gas blown into the recovery box 45 by the blower 49 blows the fragmented PE film into the front cavity of the recovery box 45, so that the fragmented PE film can move to the top of the inclined plate 411. The fragmented PE film will move along the inclined surface of the inclined plate 411 to the inside of the winding device 3 for recycling.

[0060] The driving assembly 48 used therein includes two guide rods 4801 fixed inside the rear cavity of the recycling box 45. The guide rods 4801 pass through the two curved knives 47 and are used to limit the moving direction of the two curved knives 47. A turntable 4802 is provided at the top of the rear cavity of the recycling box 45. The two sides of the bottom of the turntable 4802 are respectively hinged to the middle of the top of the two curved knives 47 through connecting rods 4803. A rotating shaft 4804 is fixed in the middle of the connecting rod 4803. The top of the rotating shaft 4804 passes through the recycling box 45 and extends out of the top of the recycling box 45. The top of the rotating shaft 4804 is driven by a gear rack transmission member 4805 and rotates at 90 The gear in the rack and pinion transmission 4805 is an incomplete gear, and the number of teeth of the incomplete gear is one-fourth of the number of teeth of the complete gear. A linear drive element is used to drive the rack in the rack and pinion transmission 4805 to move back and forth, so that the two arc-shaped knives 47 can be driven by the incomplete gear to make a mirror-like reciprocating motion, so that the two arc-shaped knives 47 can cut the strip of PE film when they move toward the middle, and the cross-section of the arc-shaped knife 47 is arc-shaped, which can limit the cut PE film fragments between the two arc-shaped knives 47, so that the gas blown out from the blower 49 can blow them to the top of the inclined plate 411.

[0061] In the present invention, the processing and recycling of the PE film can be carried out simultaneously, thereby avoiding the problem that the PE film cannot be directly recycled due to dust accumulation caused by random stacking. At the same time, re-introducing the cut PE film into the extrusion device 1 can also improve the utilization rate of the raw materials and reduce the processing cost of the PE film.

[0062] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without making any creative work still fall within the scope of protection of the present invention.

Claims

1. A PE film casting processing and recycling integrated production system, comprising an extrusion device (1), wherein the extrusion device (1) is composed of an extruder (11), a T-die (12) and a feed hopper (13), polyethylene particles are fed into the extruder (11) through the feed hopper (13) and then molten polyethylene is extruded through the T-die (12), characterized in that: A cooling device (2) for cooling molten polyethylene is provided on one side of the extrusion device (1); the molten polyethylene is cooled and formed by the cooling device (2) to form a PE film; The cooling device (2) includes two cooling rollers (21) rotating in opposite directions, one cooling roller (21) is located at the bottom of the T-die (12), and the other cooling roller (21) is at the same height as the T-die (12) and is located on one side of the T-die (12). A chiller (23) for inputting low-temperature cooling water into the interior of the cooling rollers (21) is provided on the rear side of the two cooling rollers (21), and an outer cooling assembly (22) for cooling the molten polyethylene from the outside is provided on the outer ends of the two cooling rollers (21); The cooling device (2) is provided with a winding device (3) for winding up the PE film on a side away from the extrusion device (1). The formed PE film is cut into different widths by a slitting and recycling device (4). The cut PE film is directly recycled into the feed hopper (13) by the slitting and recycling device (4) for reuse. The outer cooling assembly (22) includes an arc-shaped plate (2201) covering the outside of the two cooling rollers (21), and a hollow cold guide plate (2203) is fixed on the inner side of each arc-shaped plate (2201). A portion of the low-temperature cooling water output by the chiller (23) enters the interior of the hollow cold guide plate (2203) from one end of the hollow cold guide plate (2203) located at a high position, and is used to cool the other side of the molten polyethylene when the molten polyethylene contacts the cooling roller (21). The cooling water heated inside the cooling roller (21) flows into the interior of the hollow cold guide plate (2203) through the cooling roller outlet pipe (26) and is discharged to the interior of the chiller (23) together with the cooling water heated in the hollow cold guide plate (2203) for cooling. The rear ends of the two cooling rollers (21) are connected to cooling roller water inlet pipes (25), and the tops of the rear sides of the two hollow cooling plates (2203) are fixedly connected to cooling plate water inlet pipes (2204), and the cooling roller water inlet pipes (25) and the cooling plate water inlet pipes (2204) are connected to the cold water outlet of the chiller (23) through the cold water pipe (24); The rear bottoms of the two hollow cold guide plates (2203) are both connected to cold guide plate water outlet pipes (2205), the cooling roller water outlet pipe (26) is connected to the inner cavity of the bottom end of the hollow cold guide plate (2203), and the ends of the two cold guide plate water outlet pipes (2205) away from the cooling roller (21) are both connected to the hot water input port of the chiller (23) through the hot water pipe (27); The slitting and recycling device (4) includes a recycling box (45), two arc-shaped knives (47) and a driving assembly (48); The driving assembly (48) includes two guide rods (4801) fixed inside the rear cavity of the recovery box (45), and the guide rods (4801) pass through the two arc-shaped knives (47) and are used to limit the moving direction of the two arc-shaped knives (47); A turntable (4802) is provided at the top of the rear cavity of the recycling box (45). The bottom sides of the turntable (4802) are respectively hinged to the middle of the tops of the two arc-shaped knives (47) through connecting rods (4803). A rotating shaft (4804) is fixed in the middle of the connecting rod (4803). The top of the rotating shaft (4804) passes through the recycling box (45) and extends out of the top of the recycling box (45). The top of the rotating shaft (4804) is driven by a gear rack transmission member (4805) and rotates back and forth in an arc of 90°. The gear in the gear rack transmission member (4805) is an incomplete gear, and the number of teeth of the incomplete gear is one-fourth of the number of teeth of the complete gear.

2. The PE film tape casting processing and recycling integrated production system according to claim 1, characterized in that: The cooling roller (21) located at the bottom of the T-die (12) rotates counterclockwise, and the cooling roller (21) at the same height as the T-die (12) rotates clockwise; Two rollers (2206) are respectively provided at both ends of the two hollow cooling plates (2203), and the two rollers (2206) are both located outside the cooling roller (21) and rotate in the opposite direction to the cooling roller (21). The front and rear ends of the arc plate (2201) are respectively movably connected to baffles (2202) via bearings, and the arc plate (2201) is fixed between the two baffles (2202). The side of the hollow cooling plate (2203) away from the cooling roller (21) is fixed to the inner wall of the arc plate (2201).

3. The PE film tape casting processing and recycling integrated production system according to claim 1, characterized in that: The winding device (3) includes a winding guide roller (31) that rotates counterclockwise, and the winding guide roller (31) is located at the bottom of a cooling roller (21) at the same height as the T-die (12). A winding roller group (32) is provided on one side of the winding guide roller (31), and the winding roller group (32) is fixed by a support plate (34). A winding roller (33) for winding the PE film is provided on the side of the winding roller group (32) away from the winding guide roller (31). The winding roller (33) rotates clockwise, and the formed PE film is wound at the outer end of the winding roller (33) through the transmission of the winding guide roller (31) and the winding roller group (32).

4. The PE film tape casting processing and recycling integrated production system according to claim 3, characterized in that: A cabinet (35) is provided on the rear side of the support plate (34).

5. The PE film tape casting processing and recycling integrated production system according to claim 3, characterized in that: The slitting and recycling device (4) further comprises a slitting assembly (41), the slitting assembly (41) being located on a side of the winding guide roller (31) close to the extrusion device (1), the slitting assembly (41) being fixed to the inner side of the support plate (34) via a bracket, a recycling guide roller (42) rotating clockwise being provided on the side of the bottom of the winding guide roller (31) away from the extrusion device (1), and a recycling roller group (43) for conveying the cut PE film being provided at the bottom of the cooling roller (21) and the bottom of the extruder (11); One side of the feed hopper (13) is connected to a recycling box (45), a partition plate (410) is fixed in the middle of the recycling box (45), a rectangular through hole is opened in the middle of the partition plate (410), the interior of the recycling box (45) is divided into a front cavity and a rear cavity with the partition plate (410) as the boundary, the bottom of the rear cavity of the recycling box (45) is rotatably connected to a conveying roller (44) with opposite rotation directions, the cut PE film passes through between the two conveying rollers (44) and moves upward, a partition plate (46) is provided on the top of the conveying roller (44), and a channel for the PE film to pass through is opened in the middle of the partition plate (46). A plurality of blades (412) distributed at equal intervals are fixed inside the channel. The upwardly moving PE film is cut into strips after contacting the blades (412). Two arc-shaped knives (47) driven by a driving assembly (48) and moving in opposite directions are provided on the top of the partition (46). The strip of PE film moves between the two arc-shaped knives (47) and is cut into fragments by the arc-shaped knives (47). A blower (49) for blowing air into the interior of the recovery box (45) is installed on the rear side wall of the recovery box (45). The gas blown by the blower (49) blows the fragmented PE film into the front cavity of the recovery box (45); An inclined plate (411) is fixed in the front cavity of the recycling box (45), and the fragmented PE film moved to the top of the inclined plate (411) will move along the inclined surface of the inclined plate (411) to the inside of the winding device (3) for recycling.

6. The PE film tape casting processing and recycling integrated production system according to claim 5, characterized in that: The slitting assembly (41) comprises a slitting knife (4101), the blade of the slitting knife (4101) being tangent to the outer wall of the winding guide roller (31), and an electric push rod b (4103) for driving the slitting knife (4101) away from or towards the winding guide roller (31) being provided on the side of the slitting knife (4101) away from the winding guide roller (31), and an electric push rod a (4102) for driving the slitting knife (4101) to move along the central axis of the winding guide roller (31) being provided on one side of the electric push rod b (4103) and the slitting knife (4101).

7. The PE film tape casting processing and recycling integrated production system according to claim 5, characterized in that: The extruder (11) is supported on the ground by an extruder frame (14), and the recovery roller set (43) is installed inside the extruder frame (14).

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