Biaxially-oriented polypropylene (BOPP) film double-screw extruder

Abstract

The utility model discloses a biaxially-oriented polypropylene (BOPP) film double-screw extruder, relates to the technical field of extruders, and aims to solve the problems that in the prior art, generally, granular raw materials enter the double-screw extruder from a feeding hole to be heated and extruded, but sometimes, the granular raw materials block the feeding hole, so that rear granular raw materials cannot enter the extruder smoothly; the extrusion machine comprises a machine case of the extrusion machine, the raw material box is arranged behind the upper end of the extruder case, a feeding port is formed in the bottom of the raw material box, the raw material box communicates with the interior of the extruder case through the feeding port, a first transverse plate is arranged on the bottom side of the interior of the raw material box, and a second through groove is formed in one side of the surface of the first transverse plate; and the second through groove communicates with the upper end and the lower end of the first transverse plate, a second transverse plate is arranged on the bottom side in the raw material box and located above the first transverse plate, and a gap is reserved between the second transverse plate and the first transverse plate.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a BOPP film double-screw extruder. Background Technique

[0002] The BOPP film, also known as biaxially oriented polypropylene film, is generally a multi-layer co-extruded film. It is made by co-extruding polypropylene particles into a sheet and then stretching it in both the longitudinal and transverse directions. Due to the molecular orientation during stretching, this film has good physical stability, mechanical strength, airtightness, high transparency and gloss, and is tough and wear-resistant. It is a widely used printing film. The twin-screw extruder is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the forming and processing of extruded products.

[0003] Usually, the granular raw materials enter the inside of the double-screw extruder from the feeding port for heating and extrusion. However, sometimes the granular raw materials will block the feeding port, resulting in the inability of the subsequent granular raw materials to smoothly enter the inside of the extruder, thus affecting the normal operation of the extruder. Therefore, we propose a BOPP film double-screw extruder to solve the problems mentioned above. Content of the Utility Model

[0004] The purpose of the utility model is to provide a BOPP film double-screw extruder to solve the problem mentioned in the above background technique that usually, the granular raw materials enter the inside of the double-screw extruder from the feeding port for heating and extrusion, but sometimes the granular raw materials will block the feeding port, resulting in the inability of the subsequent granular raw materials to smoothly enter the inside of the extruder, thus affecting the normal operation of the extruder.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a BOPP film double-screw extruder, including an extruder chassis;

[0006] It further includes:

[0007] The raw material box is arranged at the rear of the upper end of the extruder chassis. There is a feed inlet at the bottom of the raw material box, and the raw material box is connected to the inside of the extruder chassis through the feed inlet. A first horizontal plate is arranged on the inner bottom side of the raw material box. A second through groove is arranged on one side of the surface of the first horizontal plate, and the second through groove communicates with the upper and lower ends of the first horizontal plate. A second horizontal plate is arranged on the inner bottom side of the raw material box. The second horizontal plate is located above the first horizontal plate, and there is a gap between the second horizontal plate and the first horizontal plate. A third motor is arranged on the upper end surface of the second horizontal plate. A rotating roller is arranged at the bottom of the third motor, and the bottom end of the rotating roller penetrates through the second horizontal plate and extends to the upper end surface of the first horizontal plate. A scraping plate is arranged on one side below the outer wall surface of the rotating roller. The scraping plate is located between the second horizontal plate and the first horizontal plate. The third motor drives the rotating roller to drive the scraping plate to rotate between the second horizontal plate and the first horizontal plate, and the height of the gap between the second horizontal plate and the first horizontal plate is the same as the height of the scraping plate. A top cover is arranged at the upper end of the raw material box. An adding port is arranged on one side of the surface of the top cover. An extrusion port is arranged at the front end of the extruder chassis.

[0008] Preferably, a conical plate is arranged inside the raw material box. A first through groove is integrally formed on one side of the bottom of the conical plate. The first through groove communicates with the bottom of the second horizontal plate, and the first through groove is located on the other side above the second through groove.

[0009] Preferably, a second motor is arranged at the upper end of the top cover. A rotating shaft is arranged at the bottom of the second motor, and the rotating shaft extends into the raw material box. A plurality of uniformly arranged stirring rods are arranged on the surface of the rotating shaft.

[0010] Preferably, a screw rod is arranged in the middle of the inside of the extruder chassis, and there are two screw rods. Spiral blades are uniformly arranged on the surface of the screw rods. A baffle is arranged at the rear end of the inside of the extruder chassis. Gears are arranged at the rear ends of the two screw rods, and the gears are located behind the baffle. A first motor is arranged at the rear end of the baffle, and the first motor is fixedly connected to one of the gears.

[0011] Preferably, the rotation directions of the two screw rods are opposite, and the two spiral blades are mutually displaced.

[0012] Preferably, a partition plate is arranged inside the extruder chassis, and the partition plate is located at the upper and lower ends of the screw rod. Heating rods are arranged on the outer side of the partition plate.

[0013] Preferably, the scraping plate 20 is made of polytetrafluoroethylene material.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By setting a raw material box at the upper end of the extruder chassis, arranging two horizontal plates inside the raw material box, and installing a rotatable scraper between the two horizontal plates, granular raw materials fall from the through groove on one side of the second horizontal plate onto the surface of the first horizontal plate. The rotating scraper sweeps the granular raw materials into the through groove on the other side of the first horizontal plate, so that the granular raw materials can be dispersed into the interior of the extruder chassis, and the granular raw materials can enter the chassis interior in sequence and orderly. In this way, a large amount of granular raw materials will not block at the feeding port, causing the subsequent raw materials to be unable to enter.

[0016] 2. By arranging a stirring mechanism inside the raw material box to stir the raw materials, the raw materials can move continuously inside the raw material box and will not accumulate together and cause failure to fall. At the same time, a conical plate with a relatively large inclination angle is arranged inside the raw material box, which can enable the raw materials to concentrate and fall from the first through groove, thus facilitating the granular raw materials to be smoothly swept by the scraper into the feeding port below. Brief Description of the Drawings

[0017] Figure 1 It is the internal side view of the overall structure of the present utility model;

[0018] Figure 2 It is the sectional view of the internal structure of the raw material box of the present utility model;

[0019] Figure 3 It is the schematic diagram of the overall structure of the present utility model;

[0020] Figure 4 It is the schematic diagram of the screw structure of the present utility model;

[0021] In the figure: 1. Extruder chassis; 2. First motor; 3. Baffle; 4. Partition; 5. Heating rod; 6. Screw; 7. Spiral blade; 8. Extrusion port; 9. Raw material box; 10. Feeding port; 11. Second motor; 12. Top cover; 13. Rotating shaft; 14. Stirring rod; 15. Adding port; 16. Conical plate; 17. First through groove; 18. Third motor; 19. Rotating roller; 20. Scraper; 21. First horizontal plate; 22. Second through groove; 23. Gear; 24. Second horizontal plate. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0023] Please refer to Figures 1-4 , an embodiment provided by the present utility model: A BOPP film double-screw extruder includes an extruder chassis 1;

[0024] It further includes:

[0025] The raw material box 9 is arranged at the rear of the upper end of the extruder chassis 1. The bottom of the raw material box 9 is provided with a feed inlet 10, and the raw material box 9 communicates with the inside of the extruder chassis 1 through the feed inlet 10. A first cross plate 21 is arranged on the inner bottom side of the raw material box 9. A second through groove 22 is arranged on one side of the surface of the first cross plate 21, and the second through groove 22 communicates with the upper and lower ends of the first cross plate 21. A second cross plate 24 is arranged on the inner bottom side of the raw material box 9. The second cross plate 24 is located above the first cross plate 21, and there is a gap between the second cross plate 24 and the first cross plate 21. A third motor 18 is arranged on the upper end surface of the second cross plate 24. A rotating roller 19 is arranged at the bottom of the third motor 18, and the bottom end of the rotating roller 19 penetrates through the second cross plate 24 and extends to the upper end surface of the first cross plate 21. A scraping plate 20 is arranged on one side below the outer wall surface of the rotating roller 19. The scraping plate 20 is located between the second cross plate 24 and the first cross plate 21. The third motor 18 drives the rotating roller 19 to drive the scraping plate 20 to rotate between the second cross plate 24 and the first cross plate 21, and the height of the gap between the second cross plate 24 and the first cross plate 21 is the same as the height of the scraping plate 20. A top cover 12 is arranged at the upper end of the raw material box 9. An adding port 15 is arranged on one side of the surface of the top cover 12. An extrusion port 8 is arranged at the front end of the extruder chassis 1.

[0026] Two cross plates are arranged inside the raw material box 9, and a rotatable scraping plate 20 is arranged between the two cross plates. The granular raw materials fall from the through groove on one side of the second cross plate 24 onto the surface of the first cross plate 21, and the granular raw materials are swept to the through groove on the other side of the first cross plate 21 by the rotation of the scraping plate 20, so that the granular raw materials can enter the inside of the extruder chassis 1 dispersedly, and the granular raw materials enter the inside of the chassis in sequence and orderly.

[0027] Please refer to Figure 2 , a conical plate 16 is arranged inside the raw material box 9. A first through groove 17 is integrally formed on one side of the bottom of the conical plate 16. The first through groove 17 communicates with the bottom of the second cross plate 24, and the first through groove 17 is located on the other side above the second through groove 22, which is convenient for the raw materials to fall downward.

[0028] Please refer to Figure 1 , a second motor 11 is arranged at the upper end of the top cover 12. A rotating shaft 13 is arranged at the bottom of the second motor 11, and the rotating shaft 13 extends into the raw material box 9. A plurality of stirring rods 14 are evenly arranged on the surface of the rotating shaft 13, which is convenient for stirring the raw materials.

[0029] Please refer to Figure 1, a screw rod 6 is arranged in the middle inside the extruder casing 1, and there are two screw rods 6. The surface of the screw rod 6 is evenly provided with spiral blades 7. A baffle 3 is arranged at the rear end inside the extruder casing 1. The rear ends of both screw rods 6 are provided with gears 23, and the gears 23 are located behind the baffle 3. A first motor 2 is arranged at the rear end of the baffle 3, and the first motor 2 is connected and fixed to one of the gears 23. The two screw rods 6 are driven to rotate through the transmission of the two gears 23.

[0030] Please refer to Figure 4 , the rotation directions of the two screw rods 6 are opposite, and the two spiral blades 7 are mutually displaced, which can extrude the raw materials more quickly.

[0031] Please refer to Figure 1 , a partition plate 4 is arranged inside the extruder casing 1, and the partition plate 4 is located at the upper and lower ends of the screw rod 6. Heating rods 5 are arranged outside the partition plate 4 to heat the BOPP film raw materials.

[0032] Please refer to Figure 2 , the scraper 20 is made of polytetrafluoroethylene material, and this material can facilitate the rotation of the scraper 20 between the first cross plate 21 and the second cross plate 24, reducing the friction generated between the scraper 20 and the first cross plate 21 and the second cross plate 24.

[0033] Working principle: Pour the BOPP film raw materials from the adding port 15 into the inside of the raw material box 9. At the same time, start the second motor 11 to drive the stirring rod 14 to stir the BOPP film raw materials. Under the action of gravity and the conical plate 16, the BOPP film raw materials fall from the first through groove 17 onto the surface of the first cross plate 21. Then start the third motor 18 to drive the scraper 20 to rotate, sweep the BOPP film raw materials falling on the surface of the first cross plate 21 into the inside of the second through groove 22, and enter the inside of the extruder casing 1 from the feed port 10, so as to carry out the process of heating and extrusion.

[0034] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A BOPP film twin-screw extruder, comprising an extruder chassis (1); Features: Also includes: A raw material box (9) is arranged at the rear of the upper end of the extruder case (1); a feed port (10) is arranged at the bottom of the raw material box (9), and the raw material box (9) is connected to the interior of the extruder case (1) through the feed port (10); a first transverse plate (21) is arranged at the bottom of the interior of the raw material box (9); a second through groove (22) is arranged on one side of the surface of the first transverse plate (21), and the second through groove (22) is connected to the upper and lower ends of the first transverse plate (21); a second transverse plate (24) is arranged at the bottom of the interior of the raw material box (9), and the second transverse plate (24) is located above the first transverse plate (21), and a gap is left between the second transverse plate (24) and the first transverse plate (21); a third motor (18) is arranged on the upper end surface of the second transverse plate (24), and the third motor (18) A rotating roller (19) is arranged at the bottom, and the bottom end of the rotating roller (19) passes through the second transverse plate (24) and extends to the upper end surface of the first transverse plate (21); a scraper (20) is arranged on one side below the outer wall surface of the rotating roller (19); the scraper (20) is located between the second transverse plate (24) and the first transverse plate (21); a third motor (18) drives the rotating roller (19) to drive the scraper (20) to rotate between the second transverse plate (24) and the first transverse plate (21); and the height of the gap between the second transverse plate (24) and the first transverse plate (21) is consistent with the height of the scraper (20); a top cover (12) is arranged at the upper end of the raw material box (9); a feeding port (15) is arranged on one side of the surface of the top cover (12); and an extrusion port (8) is arranged at the front end of the extruder chassis (1).

2. A BOPP film twin-screw extruder according to claim 1, characterized in that: A conical plate (16) is provided inside the raw material box (9), and a first through groove (17) is integrally formed on one side of the bottom of the conical plate (16). The first through groove (17) is connected to the bottom of the second transverse plate (24), and the first through groove (17) is located on the other side of the upper end of the second through groove (22).

3. A BOPP film twin-screw extruder according to claim 1, characterized in that: A second motor (11) is disposed at the upper end of the top cover (12), a rotating shaft (13) is disposed at the bottom of the second motor (11), and the rotating shaft (13) extends into the interior of the raw material box (9), and a plurality of evenly arranged stirring rods (14) are disposed on the surface of the rotating shaft (13).

4. A BOPP film twin-screw extruder according to claim 1, characterized in that: A screw (6) is arranged in the middle of the extruder case (1), and two screws (6) are arranged. Spiral blades (7) are evenly arranged on the surface of the screw (6). A baffle (3) is arranged at the rear end of the extruder case (1). A gear (23) is arranged at the rear end of the two screws (6), and the gear (23) is located behind the baffle (3). A first motor (2) is arranged at the rear end of the baffle (3), and the first motor (2) is connected and fixed to one of the gears (23).

5. A BOPP film twin-screw extruder according to claim 4, characterized in that: The two screws (6) rotate in opposite directions, and the two spiral blades (7) are offset from each other.

6. A BOPP film twin-screw extruder according to claim 1, characterized in that: A partition (4) is arranged inside the extruder chassis (1), and the partition (4) is located at the upper and lower ends of the screw (6), and a heating rod (5) is arranged outside the partition (4).

7. A BOPP film twin-screw extruder according to claim 1, characterized in that: The scraper (20) is made of polytetrafluoroethylene material.

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