Extrusion system for PC film production line
By designing a special extrusion system for PC film production lines, the problem that existing equipment cannot effectively produce PC films below 0.05mm is solved, rapid plasticization of screws and stable material extrusion is achieved, and production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202422257154.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing equipment is not suitable for producing PC films below 0.05mm, and the screw plasticization is slow, which cannot meet the needs of PC film production lines.
An extrusion system for PC film production lines is designed, including special screws and extrusion dies. The screw is made of 38CrMoAL material, with an aspect ratio of 38:1. The outer diameter of the thread is evenly distributed in the feed section, separation section and metering section. A liquid phase tank is provided on the threads of the separation section, and a mixing section and a mixing tank are arranged on the mixing section, which improves the plasticization effect of the material.
It realizes that screws are suitable for the production of PC films, with fast and sufficient plasticization, simple structure of the extrusion system, efficient and energy-saving, and can stably extrude materials.
Smart Images
Figure CN223030322U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of plastic product production equipment, and particularly relates to an extrusion system for a PC film production line. Background Art
[0002] Currently, traditional equipment is mainly used for producing PC sheets with a thickness of more than 0.8 mm. The screws of such equipment are designed for the materials used to make PC sheets, and these screws have a slow plasticization speed and are not suitable for producing PC films with a thickness of less than 0.05 mm. Summary of the Invention
[0003] To solve the existing technical problems, the purpose of this application is to provide an extrusion system for a PC film production line.
[0004] To achieve the above purpose, this application adopts the following technical scheme: An extrusion system for a PC film production line includes an extruder and an extrusion die connected to the extrusion outlet of the extruder. The extruder includes a feed hopper, a barrel, a screw rotatably arranged in the barrel, and a driving device for driving the screw to rotate. The screw includes a rod body extending from front to back and a thread spirally extending along the rod body. The rod body is successively a feeding section, a separation section, a metering section, and a mixing section from front to back. The outer diameter of the thread is evenly and invariantly distributed in the feeding section, the separation section, and the metering section from front to back. Liquid-phase grooves are formed on the thread of the separation section, and the liquid-phase grooves separate the thread into a main ridge and a secondary ridge. The lead of the main ridge is greater than the lead of the thread in the feeding section, and the lead of the main ridge is evenly and invariantly from front to back. The secondary ridge is successively a first segment, a second segment, and a third segment from front to back. The lead of the first segment is greater than the lead of the main ridge. The lead of the second segment is equal to the lead of the main ridge. The lead of the third segment is greater than the lead of the first segment. A plurality of mixing parts are arranged successively from front to back on the mixing section. Each of the mixing parts surrounds the rod body for one week and protrudes radially outward from the rod body. A plurality of mixing grooves are formed on each of the mixing parts and are circumferentially spaced apart around the rod body. The length-diameter ratio of the screw is 38:1, and the length of the separation section is 1.5 times the length of the metering section.
[0005] In the above technical scheme, further preferably, the bottom diameter of the feeding section is smaller than the bottom diameter of the metering section.
[0006] In the above technical scheme, further preferably, the lead of the thread in the metering section is consistent with the lead of the thread in the feeding section.
[0007] In the above technical solution, further preferably, the length of the feeding section is greater than the length of the metering section and less than the length of the separation section.
[0008] In the above technical solution, further preferably, each of the mixing tanks has an included angle of 30° - 45° with the axis line of the rod body.
[0009] In the above technical solution, further preferably, each of the mixing parts has a first end face and a second end face which are arranged opposite to each other front and back. The first end face is inclined backward relative to the rod body, and the second end face is inclined forward relative to the rod body.
[0010] In the above technical solution, further preferably, both the screw and the barrel are made of 38CrMoAL material.
[0011] In the above technical solution, further preferably, a metering pump and a screen changer are arranged between the extruder and the extrusion die.
[0012] The present application has the following beneficial effects compared with the prior art:
[0013] The screw of the present application is suitable for producing PC films, with relatively fast and sufficient plasticization. The extrusion system of the present application has a simple structure, is energy-efficient, and can stably extrude materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural diagram of an extrusion system provided by an embodiment of the present application;
[0015] Figure 2 is Figure 1 a schematic structural diagram of the screw in
[0016] Figure 3 is Figure 2 a schematic structural diagram of the separation section in
[0017] Figure 4 is Figure 2 a schematic structural diagram of the mixing section in
[0018] Wherein: 100, extrusion system; 10, extruder; 1, feed hopper; 2, barrel; 21, feed inlet; 22, discharge outlet; 3, screw; 31, rod body; 311, feeding section; 312, separation section; 313, metering section; 314, mixing section; 32, thread; 321, main edge; 322, secondary edge; 3221, first segment; 3222, second segment; 3223, third segment; 33, liquid phase tank; 34, solid phase tank; 35, mixing part; 351, first end face; 352, second end face; 36, mixing tank; 4, driving device; 41, AC motor; 42, speed reducer; 20, screen changer; 30, metering pump; 40, extrusion die. Detailed implementation manners
[0019] To describe in detail the technical content, structural features, achieved objectives and effects of the application, the technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment.
[0020] The embodiment of the present application provides an extrusion system for a PC film production line, as Figure 1 shown. The extrusion system 100 includes an extruder 10, a screen changer 20, a metering pump 30 and an extrusion die 40. The extrusion port of the extruder 10, the screen changer 20, the metering pump 30 and the extrusion die 40 are connected through pipelines. After the extrusion die 40 extrudes the material in a sheet shape, it is cast onto a forming device for cooling and shaping.
[0021] The extruder 10 includes a feed hopper 1, a barrel 2, a screw 3 rotatably arranged in the barrel 2, and a driving device 4 for driving the screw 3 to rotate. The barrel 2 includes a feed inlet 21 and a discharge outlet 22. The feed hopper 1 is installed at the feed inlet 21 to introduce raw materials into the barrel 2 from the feed inlet 21. The screw 3 rotates around its own axis in the barrel 2 driven by the driving device 4 to shear and stir the material in the barrel 2, thereby realizing the plasticization of the material.
[0022] As Figure 2As shown, the length-diameter ratio of the screw 3 is 38:1. The screw 3 includes a rod body 31 extending from front to back and a thread 32 spirally extending along the rod body 31. The rod body 31 is successively an feeding section 311, a separating section 312, a metering section 313, and a kneading section 314 from front to back. The outer diameter of the thread 32 is evenly distributed in the feeding section 311, the separating section 312, and the metering section 313 from front to back. The lead S1 of the thread 32 in the feeding section 311 is evenly unchanged from front to back. The lead S3 of the thread 32 in the metering section 313 is unchanged from front to back and is the same as the lead S1. The root diameter d1 of the feeding section 311 is smaller than the root diameter d3 of the metering section 313. Therefore, the volume of the thread groove formed by the thread 32 in the feeding section 311 is larger than the volume of the thread groove formed by the thread 32 in the metering section 313. The feeding section 311 with a deeper thread groove increases the material intake of the screw 3, thereby increasing the extrusion output of the extruder 10. The uniform thread groove of the metering section 313 improves the stability of the material conveying pressure and establishes a stable extrusion pressure.
[0023] As Figure 2 , 3 shown, a liquid phase groove 33 is formed on the thread 32 of the separating section 312. The liquid phase groove 33 divides the thread 32 into a main ridge 321 and a secondary ridge 322 that spirally extend. The main ridge 321 and the secondary ridge 322 are alternately distributed on the rod body 31 from front to back. The rear end face of the main ridge 321, the front end face of the secondary ridge 322, and the outer surface of the rod body 31 form the liquid phase groove 33. The rear end face of the secondary ridge 322, the front end face of the main ridge 321, and the outer surface of the rod body 31 form a solid phase groove 34. During the plasticization process of the material by the screw 3, the main ridge 321 and the secondary ridge 322 separate the solid material and the plasticized liquid-phase material. The liquid-phase material enters the liquid phase groove 33, and the solid material continues to be plasticized and melted in the solid phase groove 34. As the solid-liquid conversion of the material progresses, the volume of the solid phase groove 34 gradually decreases, and the volume of the liquid phase groove 33 gradually increases. The volume changes of the solid phase groove 34 and the liquid phase groove 33 conform to the plasticization situation of the material, which is beneficial to improving the plasticization effect and efficiency.
[0024] The lead S of the main ridge 321 21 is greater than the lead S1 of the thread 32 in the feeding section 311, and the lead S of the main ridge 321 21 is evenly unchanged from front to back. The secondary ridge 322 is successively a first segment 3221, a second segment 3222, and a third segment 3223 from front to back. The lead S of the first segment 3221 22 is greater than the lead S of the main ridge 321 21 , the lead S of the second segment is 23 equal to the lead S of the main ridge 321 21 , and the lead S of the third segment 24 is greater than the lead S of the first segment 3221 22; The change in the lead of the secondary edge 322 causes the groove width of the liquid phase tank 33 to increase, decrease, and then increase from front to back. The change in the liquid phase tank 33 effectively improves the plasticization effect and plasticization efficiency, making the material fully plasticized in the separation section 312.
[0025] The length of the separation section 312 is 1.5 times the length of the metering section 313. The length of the feeding section 311 is greater than the length of the metering section 313 and less than the length of the separation section 312. The screw 3 of the present application adopts a structure of short separation and long metering, which accelerates plasticization and improves the output of the screw.
[0026] As Figure 2 、 4 shown, a plurality of mixing parts 35 are arranged in sequence from front to back on the mixing section 314. Each mixing part 35 surrounds the rod body 31 and protrudes radially outward from the rod body 31. A plurality of mixing grooves 36 are arranged at circumferential intervals around the rod body 31 on each mixing part 35. Each mixing groove 36 has an included angle α of 30° - 45° with the axis X1 of the rod body 31. Each mixing part 35 has a first end face 351 and a second end face 352 which are oppositely arranged front and back. The first end face 351 is inclined backward relative to the rod body 31, and the second end face 352 is inclined forward relative to the rod body 31. The first end face 351 and the second end face 352 prevent the material from accumulating on the screw 3. The mixing grooves 36 are opened on the mixing part 35 to enhance the mixing of the material and further plasticize the material, strengthening the plasticization effect.
[0027] Both the screw 3 and the barrel 2 of the present application adopt 38CrMoAL material, which improves the wear resistance of the screw 3 and the barrel 2, reduces the replacement frequency of the screw 3 and the barrel 2, and lowers the maintenance cost.
[0028] Continue to refer to Figure 1 , the driving device 4 includes an AC motor 41 with a rated power of 132KW and a speed reducer 42. The driving device 4 provides power for the screw 3, enabling the screw to plasticize the material at a suitable speed.
[0029] The screen changer 20 filters the material output by the extruder 10, preventing impurities and incompletely plasticized materials from entering the extrusion die 40 and improving the quality of the final product. The metering pump 30 is used to control the flow rate of the material delivered to the extrusion die 40, enabling the material to be stably and continuously supplied to the extrusion die 40.
[0030] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements. The scope of protection required by the present application is defined by the appended claims, the specification and their equivalents.
Claims
1. An extrusion system for a PC film production line, comprising an extruder and an extrusion die connected to an extrusion port of the extruder, wherein the extruder comprises a feed hopper, a barrel, a screw rotatably arranged in the barrel, and a driving device for driving the screw to rotate, characterized in that: The screw comprises a rod body extending from front to back and a thread extending helically along the rod body, wherein the rod body is divided into a feeding section, a separation section, a metering section and a mixing section from front to back, and the outer diameter of the thread is uniformly distributed in the feeding section, the separation section and the metering section from front to back; a liquid phase groove is provided on the thread of the separation section, and the liquid phase groove separates the thread into a main edge and a secondary edge, the lead of the main edge is greater than the lead of the thread of the feeding section, and the lead of the main edge is uniformly unchanged from front to back, and the secondary edge is divided into a first segment, a second segment and a third segment from front to back. The screw rod is divided into three sections, the lead of the first section is greater than the lead of the main edge, the lead of the second section is equal to the lead of the main edge, and the lead of the third section is greater than the lead of the first section; the mixing section is provided with a plurality of mixing parts arranged in sequence from front to back, each of the mixing parts surrounds the rod body and protrudes radially outward from the rod body, and each of the mixing parts is provided with a plurality of mixing grooves distributed at intervals in the circumferential direction of the rod body; the aspect ratio of the screw is 38:1, and the length of the separation section is 1.5 times the length of the metering section.
2. The extrusion system according to claim 1, characterized in that: The bottom diameter of the feeding section is smaller than the bottom diameter of the metering section.
3. The extrusion system according to claim 1, characterized in that The lead of the thread of the metering section is consistent with the lead of the thread of the feeding section.
4. The extrusion system according to claim 1, characterized in that The length of the feeding section is greater than the length of the metering section and less than the length of the separation section.
5. The extrusion system according to claim 1, characterized in that: Each of the mixing tanks has an angle of 30°-45° with the axis of the rod body.
6. The extrusion system according to claim 5, characterized in that Each of the kneading parts has a first end face and a second end face which are arranged front and back oppositely. The first end face is inclined backward relative to the rod body, and the second end face is inclined forward relative to the rod body.
7. The extrusion system according to claim 1, characterized in that The screw and barrel are both made of 38CrMoAL material.
8. The extrusion system according to claim 1, characterized in that A metering pump and a screen changer are arranged between the extruder and the extrusion die.