Extrusion equipment for TPU / PETG tooth socket production

Abstract

The utility model discloses extrusion equipment for TPU / PETG tooth socket production, which comprises two dehumidification and drying all-in-one machines arranged side by side, two extrusion main machines arranged side by side and an extrusion die, each extrusion main machine is provided with one dehumidification and drying all-in-one machine, the dehumidification and drying all-in-one machine is communicated with a feed port of the corresponding extrusion main machine, and the extrusion die is communicated with the dehumidification and drying all-in-one machine. Discharge ports of the two extrusion main machines are simultaneously communicated with the extrusion die, each of the two extrusion main machines comprises an extrusion screw rod with the compression ratio of 3-3.5, the diameter of the extrusion screw rod of one extrusion main machine is 60-70mm, the length-diameter ratio of the extrusion screw rod of one extrusion main machine is 34: 1, the diameter of the extrusion screw rod of the other extrusion main machine is 40-50mm, and the length-diameter ratio of the extrusion screw rod of the other extrusion main machine is 33: 1; according to the production device, the high-quality TPU / PETG membrane can be rapidly and stably produced, and the quality of the TPU / PETG tooth socket is ensured.

Description

Technical Field

[0001] This application relates to the field of plastic production equipment technology, and in particular to an extrusion device for the production of TPU / PETG dental braces. Background Technology

[0002] Currently, in the braces market, invisible braces are more popular with consumers than metal braces. They are far superior to metal braces in terms of aesthetics and comfort. Invisible braces are generally made of one or more of the following materials: TPU, SIS, and PETG. They are transparent and elastic. In order to increase the production of invisible braces, there is a need in the market for extrusion equipment that can produce TPU / PETG braces films in a high-quality, efficient and stable manner. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a high-quality, efficient, and stable extrusion device for the production of TPU / PETG dental braces.

[0004] To achieve the above objectives, this application adopts the following technical solution: an extrusion equipment for the production of TPU / PETG dental braces, comprising two dehumidifying and drying integrated machines arranged side by side, two extrusion main units arranged side by side, and an extrusion die. Each of the extrusion main units is equipped with one of the dehumidifying and drying integrated machines. The dehumidifying and drying integrated machine is connected to the feed port of the corresponding extrusion main unit. The discharge ports of both extrusion main units are simultaneously connected to the extrusion die. Both of the extrusion main units include an extrusion screw with a compression ratio of 3-3.5. The diameter of the extrusion screw of one of the extrusion main units is 60-70 mm, and the length-to-diameter ratio is 34:1. The diameter of the extrusion screw of the other extrusion main unit is 40-50 mm, and the length-to-diameter ratio is 33:1.

[0005] In the above technical solution, more preferably, each of the extrusion screws includes a rod extending from front to back and a thread extending helically around the rod. The rod is arranged from front to back as a feeding section, a compression section, a homogenization section, a first mixing section, and a second mixing section. The outer diameter and lead of the thread are equally and unchanged in the feeding section, the compression section, and the homogenization section. The first mixing section has multiple feed grooves and multiple discharge grooves alternately distributed along the circumference of the rod. The second mixing section includes a pair of mixing groups arranged from front to back. Each mixing group includes a plurality of mixing grooves spaced apart along the circumference of the rod.

[0006] In the above technical solution, it is further preferred that the bottom diameter of the compression section gradually increases from front to back, the bottom diameter of the feeding section is equal to the minimum bottom diameter of the compression section, and the bottom diameter of the homogenization section is equal to the maximum bottom diameter of the compression section.

[0007] In the above technical solution, it is further preferred that the plurality of feed troughs and the plurality of discharge troughs are parallel, and each feed trough and each discharge trough has a first inclined angle with the axis of the rod body, the first inclined angle being 30°-45°.

[0008] In the above technical solution, it is further preferred that each of the mixing grooves has a second inclined angle with the axis of the rod, and the second inclined angle is 30°-45°.

[0009] In the above technical solution, in a further preferred embodiment, each of the extrusion main units further includes a barrel, a feed hopper installed at the feed inlet, and a drive motor that is drivenly connected to the extrusion screw. The feed inlet is opened on the side wall of the barrel and close to the front end of the barrel, and the discharge port is located at the rear end of the barrel. An extrusion channel extending from front to back is opened inside the barrel. The extrusion channel connects the feed inlet and the discharge port. The extrusion screw of each of the extrusion main units is rotatably arranged in the extrusion channel.

[0010] In the above technical solution, it is further preferred that the dehumidification and drying integrated machine is a dehumidification device with a dehumidification capacity of 200-500 kg / h.

[0011] In the above technical solution, a further preferred embodiment is that each of the aforementioned barrels is fitted with multiple heating coils, which are arranged sequentially from front to back.

[0012] In the above technical solution, a further preferred embodiment is that each of the extrusion main units is connected to the extrusion die, and the metering system includes a screen changer, a metering pump and multiple conveying pipes. The screen changer is installed at the discharge port of the corresponding extrusion main unit, and conveying pipes are connected between the screen changer and the metering pump and between the metering pump and the extrusion die.

[0013] In the above technical solution, a further preferred embodiment includes a mold temperature controller, which is connected to the extrusion die and is used to regulate the temperature of the extrusion die.

[0014] Compared with the prior art, this application achieves the following beneficial effects:

[0015] The two extrusion machines in this application can fully melt and plasticize TPU and PETG materials respectively, so as to stably and efficiently produce high-quality materials. The two fully plasticized materials are co-extruded into a composite TPU / PETG film through an extrusion die. This application can quickly and stably produce high-quality TPU / PETG films, ensuring the quality of TPU / PETG braces. Attached Figure Description

[0016] Figure 1 A front view of an extrusion device provided in an embodiment of this application;

[0017] Figure 2 for Figure 1 Top view of the extrusion equipment in the middle;

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the extrusion screw in the extrusion equipment;

[0019] Figure 4 for Figure 3 A schematic diagram of the structure of the first mixing section;

[0020] Figure 5 for Figure 3 A schematic diagram of the structure of the second mixing section.

[0021] The components are as follows: 100. Extrusion equipment; 10. Dehumidification and drying integrated machine; 20. Extrusion host; 1. Barrel; 2. Extrusion screw; 21. Screw body; 211. Feeding section; 212. Compression section; 213. Homogenization section; 214. First mixing section; 215. Second mixing section; 22. Thread; 23. Feed chute; 24. Discharge chute; 25. Mixing group; 251. Mixing tank; 3. Feed hopper; 4. Drive motor; 5. Heating coil; 30. Extrusion die; 40. Metering system; 6. Screen changer; 7. Metering pump; 50. Mold temperature controller. Detailed Implementation

[0022] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous 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 one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0023] This application provides an extrusion device for the production of TPU / PETG dental braces. The extrusion device is capable of extruding composite TPU / PETG dental brace films for subsequent TPU / PETG dental brace shaping and production.

[0024] like Figure 1 ,2 As shown, the extrusion equipment 100 includes two dehumidifying and drying integrated machines 10 arranged side by side, two extrusion main units 20 arranged side by side, and an extrusion die 30. Each extrusion main unit 20 is equipped with one dehumidifying and drying integrated machine 10. The dehumidifying and drying integrated machine 10 is connected to the feed port of the corresponding extrusion main unit 20, and the discharge ports of both extrusion main units 20 are simultaneously connected to the extrusion die 30. The two dehumidifying and drying integrated machines 10 dehumidify and dry the corresponding materials respectively, so that they reach a crystallized state and are then fed into the corresponding extrusion main unit 20 through their connected feed ports. The two extrusion main units 20 melt and plasticize their respective materials into a fluid form, and simultaneously and stably convey them into the extrusion die 30. The extrusion die 30 then co-extrudes the materials input from the two extrusion main units 20 into a film for output. Both extrusion main units include extrusion screws with a compression ratio of 3-3.5. The high compression ratio of the extrusion screws can efficiently plasticize and melt the materials, improving plasticization efficiency and plasticization quality. One extruder has a screw diameter of 60-70 mm and an aspect ratio of 34:1, suitable for the production of TPU material; the other extruder has a screw diameter of 40-50 mm and an aspect ratio of 33:1, suitable for the production of PETG material. In this embodiment, one extruder is used to produce TPU material, with a screw diameter of 65 mm, and the other extruder is used to produce PETG material, with a screw diameter of 45 mm. The two materials are co-extruded in an extrusion die to form a TPU / PETG dental brace film.

[0025] like Figure 1-3As shown, each of the extrusion main units 20 includes a barrel 1, an extrusion screw 2 rotatably mounted inside the barrel 1, a feed hopper 3 mounted on the barrel 1, and a drive motor 4 connected to the extrusion screw 2. The diameters and length-to-diameter ratios of the extrusion screws of the two extrusion main units 20 are different, but their structures are identical. Each extrusion screw 2 includes a rod body 21 extending from front to back and a thread 22 spirally extending from front to back around the rod body 21. The rod body 21 is arranged sequentially from front to back as a feed section 211, a compression section 212, a homogenization section 213, a first mixing section 214, and a second mixing section 215. The outer diameter and lead of the thread 22 are equally and continuously arranged in the feed section 211, the compression section 212, and the homogenization section 213. The bottom diameter of the compression section 212 gradually increases from front to back. The bottom diameter of the feed section 211 is equal to the minimum bottom diameter of the compression section 212, and the bottom diameter of the homogenization section 213 is equal to the maximum bottom diameter of the compression section 212. A thread 22 with a uniform outer diameter and a feed section 211 with a constant bottom diameter form a feed trough with a constant volume, allowing material to be stably conveyed forward along the feed trough in the feed section 211. A thread 22 with a uniform outer diameter and a compression section 212 with a gradually increasing bottom diameter form a feed trough with a gradually decreasing volume, allowing material to be gradually compressed and rubbed within the decreasing volume feed trough in the compression section 212, plasticizing and melting it into a fluid state. A thread 22 with a uniform outer diameter and a homogenization section 213 with a constant bottom diameter form a feed trough with a constant volume, allowing material to be stably conveyed under pressure in the homogenization section 213 with a uniform volume feed trough. The bottom diameter of the homogenization section 213 is larger than that of the feed section 211, so the volume of the feed trough in the homogenization section 213 is smaller than that in the feed section 211. The deeper feed section 211 facilitates stable feeding of material by the extrusion screw 2, increasing the output of the extrusion unit 20.

[0026] like Figure 3-5 As shown, the first mixing section 214 has a plurality of feed troughs 23 and a plurality of discharge troughs 24 that are alternately distributed along the circumference of the rod body, and the second mixing section 215 includes a pair of mixing groups 25 arranged sequentially from front to back, each mixing group 25 including a plurality of mixing troughs 251 that are spaced apart along the circumference of the rod body 21.

[0027] Multiple feed troughs 23 and multiple discharge troughs 24 are parallel to each other. Each feed trough 23 and each discharge trough 24 has a first inclined angle α with respect to the axis X1 of the rod body 21. The first inclined angle α is 30°-45°. There is a barrier between adjacent feed troughs 23 and discharge troughs 24. During the rotation of the extrusion screw 2, the material in the homogenization section 213 is conveyed to the first mixing section 214. The material enters from each feed trough 23 and crosses the adjacent barrier into the discharge trough 24 under the rotation of the extrusion screw 2. When the material crosses the barrier, it undergoes intense friction, which further plasticizes it. It is then stirred in the first mixing section 214 to be fully mixed.

[0028] Each mixing tank 251 has a second inclined angle β with the axis X1 of the rod 21. The second inclined angle β is 30°-45°. A pair of mixing groups 25 further stirs and mixes the material at the tail of the extrusion screw 2, so that the material is stably conveyed to the downstream extrusion die 30.

[0029] The extrusion screws of the pair of extruders 20 are respectively configured to be suitable for the production of TPU and PETG materials, which can fully melt and plasticize the corresponding materials, improve the production efficiency of the materials, and improve the quality of the final product.

[0030] like Figure 1 , 2 As shown, the barrel 1 of each extrusion host 20 includes a feed port and a discharge port. The feed port is located on the side wall of the barrel 1 and near the front end of the barrel 1. The discharge port is located at the rear end of the barrel 1. An extrusion channel extending from front to back is provided inside the barrel 1. The extrusion channel connects the feed port and the discharge port. The extrusion screw of each extrusion host 20 is rotatably arranged in the extrusion channel to crush, plasticize and forward convey the material input from the feed port to the discharge port.

[0031] The feed hopper 3 is installed at the corresponding feed inlet. The dehumidifying and drying integrated machine 10 is connected to the feed hopper 3 and is used to transport the dehumidified and dried material into the feed hopper 3, so that the crystallized material enters the machine barrel 1 from the feed hopper 3. The dehumidifying and drying integrated machine 10 is selected with a dehumidification capacity of 200-500 kg / h to increase the feed rate, increase output and production efficiency.

[0032] Each barrel 1 is fitted with multiple heating rings 5, which are arranged sequentially from front to back. The heating of the barrel 1 by the multiple heating rings 5 ​​and the friction between the extrusion screw 2 and the material cause the material inside the barrel 1 to melt and plasticize into a fluid form.

[0033] Each extruder 20 is connected to an extrusion die 30 via a metering system 40. The metering system 40 includes a screen changer 6, a metering pump 7, and multiple delivery pipes. The screen changer 6 is installed at the outlet of the corresponding extruder 20 to filter the material output from the extruder 20, preventing unplasticized particles from entering the extrusion die 30 and affecting the molding quality of the product. The metering pump 7 is connected between the screen changer 6 and the extrusion die 30 via delivery pipes to regulate the material flow rate and ensure that the material extruded from the extrusion die 30 has a uniform thickness.

[0034] The extrusion die 30 is also connected to a mold temperature controller 50, which is used to regulate the temperature of the extrusion die 30 to prevent the material from solidifying due to cold and to ensure that the product can be extruded evenly.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.

Claims

1. An extrusion apparatus for TPU / PETG mouthguard production, characterized by, The device comprises two dehumidifying and drying integrated machines arranged side by side, two extrusion main machines arranged side by side and an extrusion die, each of the extrusion main machines is provided with one of the dehumidifying and drying integrated machines, the dehumidifying and drying integrated machine is communicated with the feeding port of the corresponding extrusion main machine, the discharge ports of the two extrusion main machines are simultaneously communicated with the extrusion die, the extrusion main machines each comprises an extrusion screw with a compression ratio of 3-3.5, the diameter of the extrusion screw of one of the extrusion main machines is 60-70mm, and the length-diameter ratio is 34:1, the diameter of the extrusion screw of the other extrusion main machine is 40-50mm, and the length-diameter ratio is 33:

1.

2. The extrusion apparatus of claim 1, wherein Each of the extrusion screws comprises a rod body extending from front to back and a thread spirally extending around the rod body, the rod body sequentially comprises a feeding section, a compression section, a homogenizing section, a first mixing section and a second mixing section from front to back, the thread is arranged in the feeding section, the compression section and the homogenizing section with equal and unchangeable outer diameter and lead.

3. The extrusion apparatus of claim 2, wherein, The bottom diameter of the compression section gradually increases from front to back, the bottom diameter of the feeding section is equal to the minimum bottom diameter of the compression section, and the bottom diameter of the homogenizing section is equal to the maximum bottom diameter of the compression section.

4. The extrusion apparatus of claim 2, wherein, The plurality of feeding grooves and the plurality of discharge grooves are parallel, each of the feeding grooves and each of the discharge grooves has a first inclined angle with the axial line of the rod body, and the first inclined angle is 30-45°.

5. The extrusion apparatus of claim 2, wherein, Each of the mixing grooves has a second inclined angle with the axial line of the rod body, and the second inclined angle is 30-45°.

6. The extrusion apparatus of claim 1, wherein, Each of the extrusion main machines further comprises a barrel, a feeding hopper installed at the feeding port, a driving motor in driving connection with the extrusion screw, the feeding port is arranged on the side wall of the barrel and close to the front end of the barrel, the discharge port is located at the rear end of the barrel, an extrusion channel extending from front to back is arranged in the barrel, the extrusion channel is communicated with the feeding port and the discharge port, and the extrusion screw of each of the extrusion main machines is rotationally arranged in the extrusion channel.

7. The extrusion apparatus of claim 1, wherein, The dehumidifying and drying integrated machine selects a dehumidifying device with a dehumidifying capacity of 200-500kg / h.

8. The extrusion apparatus of claim 6, wherein, A plurality of heating rings are sleeved on each of the barrels and sequentially arranged from front to back.

9. The extrusion apparatus of claim 1, wherein, A metering system is connected between each of the extrusion main machines and the extrusion die, the metering system comprises a screen changer, a metering pump and a plurality of conveying pipes, the screen changer is installed at the discharge port of the corresponding extrusion main machine, and the screen changer and the metering pump are connected with the conveying pipes.

10. The extrusion apparatus of claim 1, wherein, A die temperature controller is further arranged, the die temperature controller is communicated with the extrusion die, and the die temperature controller is used for adjusting the temperature of the extrusion die.

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