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CN-224210502-U - Extruder screw and extruder

CN224210502UCN 224210502 UCN224210502 UCN 224210502UCN-224210502-U

Abstract

The utility model discloses an extruder screw and an extruder, wherein the extruder screw comprises a compression section and a mixing section which are arranged along the length direction of the extruder screw, the mixing section is positioned at the downstream of the compression section so as to convey polymer melt extruded by the compression section into the mixing section, the mixing section comprises at least one forward spiral and at least one backward countercurrent spiral, the forward spiral and the backward countercurrent spiral are arranged in a staggered way, the forward spiral is used for pushing the polymer melt to flow forwards, the backward countercurrent spiral is used for making the polymer melt flow backwards to form a staggered flow path, the countercurrent effect obviously enhances the mixing uniformity of the melt and additives (such as pigment), and the extruder screw is particularly suitable for scenes with higher requirements on uniformity such as color master batches production, realizes high shearing and high mixing performance and can effectively improve the product quality.

Inventors

  • YANG KAIQIANG
  • YANG HUITING

Assignees

  • 昆山保扬新型材料科技有限公司

Dates

Publication Date
20260508
Application Date
20250430

Claims (10)

  1. 1. An extruder screw comprising a compression section and a mixing section disposed along a length thereof, said mixing section being downstream of said compression section to convey polymer melt extruded from said compression section into said mixing section; The mixing section comprises at least one forward screw for pushing the polymer melt to flow forward and at least one backward countercurrent screw for countercurrent backward of the polymer melt, which are staggered.
  2. 2. The extruder screw according to claim 1, wherein said forward flighting is provided as a plurality of mutually parallel grooves and said backward countercurrent flighting is provided as one groove interleaved with all of said forward flighting.
  3. 3. The extruder screw according to claim 2, wherein the angle between the screw direction of the forward screw and the length direction of the extruder screw is 10 ° -60 °, and is smaller than the angle between the screw direction of the backward countercurrent screw and the length direction of the extruder screw is 45 ° -90 °.
  4. 4. An extruder screw according to claim 3, wherein the forward flighting is provided as at least 10 parallel grooves, the backward countercurrent flighting being staggered at least 5 times with each of the forward flighting grooves; the grooves of the forward spiral and the backward countercurrent spiral are arc grooves, and the groove depths are the same.
  5. 5. The extruder screw according to claim 1, comprising a drive coupling interface, a stationary section, a feed section, the compression section, a metering section and the compounding section, arranged in that order along the length thereof.
  6. 6. The extruder screw according to claim 5, wherein the compression section has a diameter that gradually increases from a feed direction to a discharge direction, wherein the fixed section has a surface provided with a fixed thread, and wherein the drive coupling interface comprises a socket for relatively fixed connection with a drive device.
  7. 7. The extruder screw according to claim 5, wherein the length of the kneading block is not less than 200mm.
  8. 8. The extruder screw according to claim 5, wherein the feeding section, the compression section and the metering section are provided with threads, the pitch of the threads is 40 mm-50 mm, and the screw direction of the threads is the same as the screw direction of the forward screw.
  9. 9. The extruder screw according to claim 1, wherein the polymer melt is a mixture of plastic and colorant.
  10. 10. An extruder comprising the extruder screw according to any one of claims 1 to 9.

Description

Extruder screw and extruder Technical Field The utility model relates to an extruder screw, in particular to an extruder with the extruder screw. Background In plastic melt compounding, extruder screws are key components to achieve polymer melt delivery, compression, and mixing. Conventional extruder screws typically include a feed section, a compression section, and a metering section, which enable substantial melting and transport of the polymer. However, in certain specific applications, such as masterbatch or pigment addition scenarios, the homogeneity of the polymer melt and additives directly affects the quality of the final product. In the prior art, the mixing section mostly adopts a wolf tooth stick structure, so that an effective mixing effect is difficult to form, the mixing uniformity is insufficient, and the quality of the final extruded product is difficult to meet the requirement especially in the scene of high-speed mixing and high-uniformity requirement. Therefore, the design of the extruder screw capable of remarkably improving the mixing uniformity has important technical significance and application value. Disclosure of Invention In order to solve the problem of uneven mixing of plastics and pigments in the prior art, the utility model aims to provide an extruder screw with high mixing performance and an extruder . In order to achieve the above object, an embodiment of the present utility model provides an extruder screw comprising a compression section and a kneading section disposed along a length direction thereof, the kneading section being located downstream of the compression section to feed a polymer melt extruded from the compression section into the kneading section; The mixing section comprises at least one forward screw for pushing the polymer melt to flow forward and at least one backward countercurrent screw for countercurrent backward of the polymer melt, which are staggered. As a further development of the utility model, the forward spiral is provided as a plurality of mutually parallel grooves and the backward countercurrent spiral is provided as one groove interleaved with all of the forward spirals. As a further improvement of the utility model, the included angle between the spiral direction of the forward spiral and the length direction of the extruder screw is 10-60 degrees, and is smaller than the included angle between the spiral direction of the backward countercurrent spiral and the length direction of the extruder screw, which is 45-90 degrees. As a further improvement of the utility model, said forward spiral is provided with at least 10 parallel grooves, said backward countercurrent spiral being staggered at least 5 times with each of said forward spiral grooves; the grooves of the forward spiral and the backward countercurrent spiral are arc grooves, and the groove depths are the same. As a further improvement of the present utility model, the extruder screw includes a drive coupling interface, a fixed section, a feed section, the compression section, a metering section, and the kneading section, which are disposed in this order along the length thereof. As a further improvement of the utility model, the diameter of the compression section gradually increases from the feeding direction to the discharging direction, the surface of the fixing section is provided with a fixing thread, and the driving connection interface comprises a slot which is used for being fixedly connected with the driving device relatively. As a further improvement of the utility model, the length of the mixing section is not less than 200mm. As a further improvement of the utility model, screw threads are arranged on the feeding section, the compression section and the metering section, the distance between the screw threads is 40 mm-50 mm, and the screw direction of the screw threads is the same as the screw direction of the forward screw. As a further development of the utility model, the polymer melt is a mixture of plastics and colorants. In order to achieve one of the above objects, an embodiment of the present utility model provides an extruder including the above extruder screw. Compared with the prior art, the extruder screw has the beneficial effect that the extruder screw realizes the full mixing of polymer melt by arranging at least one forward screw and at least one backward countercurrent screw in the mixing section and arranging the screws in a staggered way. Wherein, after the polymer melt is sent into the mixing section by the compression section, the melt is pushed to flow forwards along the length direction of the screw rod by the forward spiral, and part of the melt is reversed by the backward countercurrent spiral, so that a staggered flow path is formed. The countercurrent effect obviously enhances the mixing uniformity of the melt and the additive (such as pigment), is particularly suitable for scenes with higher requirements on uniformity, such as masterbatch produ