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Extruder Screw Barrel Section

  Extruder Screw Barrel section

  The movement of the material in the Extruder Screw Barrel is divided into three sections, and the design of the screw is also often carried out in stages. As the paragraphs are continuous channel, so in the actual production, as long as they can meet the requirements, not the screw is divided into three sections can not, in fact, only two screws, and some are not segmented. For example, when extruding a good material such as nylon, only the feeding section and the homogenizing section, the general screw extruded soft polyvinyl chloride plastic screw, you can use all the compressed section, without having to be divided into the feeding section and the homogenization section The

  The segmentation of the screw from the experience, mainly depends on the nature of the material. The length of the feed section can range from 0 to 75% of the total length of the screw. Generally speaking, the longest, hard amorphous polymer is extruded from the crystalline polymer, Extruder Screw Barrel and the soft amorphous polymer is the shortest. The length of the compression section usually accounts for 50% of the total length of the screw, except as described above for nylon and soft polyvinyl chloride plastic. When extruding polyethylene, the length of the homogenization section is 20 to 25% of the total length. However, for some heat-sensitive materials (such as polyvinyl chloride), the material in this section should not stay too long, you can not equalization section. Extruder Screw Barrel Some high-speed extruder homogenization of the length of the class actually take 50%.