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Screw and Barrel for Extruder manufacturers take you to understand the selection method of plastic extruder screw
Screw and Barrel for Extruder manufacturers tell you that the screw is one of the important accessories in the plastic extruder. It not only plays the role of conveying raw materials, but also plays an irreplaceable role in the extrusion, plasticization and molding of plastics. effect. The manufacturer of Screw and Barrel for Extruder tells you that scientific selection of screw structure and parameters is the basic condition for obtaining high-quality plastic products.
In order to meet the processing needs of different plastics, there are many types of screws, among which the more common are gradient type, mutation type, torpedo head type and so on. Screw and Barrel for Extruder manufacturers tell you that the selection can be determined according to the physical properties of the plastic and the production technical parameters of the extruder.
1. If you are using a small plastic extruder, you can choose a screw with a diameter of 45mm. This screw adopts a full-thread type with equidistant and unequal depths. The length is relatively short, the diameter is relatively small, and its extrusion speed is relatively fast. .
2. If the raw material used in the extruder is an amorphous polymer, because the cover material is required to be completed within a relatively wide temperature range, it is recommended to choose an equidistant gradient screw. The manufacturer of Screw and Barrel for Extruder tells you that if the raw material used is a crystalline polymer, which requires a narrow temperature range, it is recommended to choose an equidistant mutation screw.
3. The diameter of the large screw is usually more than 150mm, which is suitable for extruders of φ150, φ200 and φ250. At present, there are two main types of large screws, one is equidistant and unequal depth, and the other is screw split. Three sections.
4. The medium-sized screw generally uses a full-thread type with equidistant and gradual thread depth. Its diameter is relatively medium, which is suitable for small and medium-sized extruders.
Screw and Barrel for Extruder manufacturers tell you that because there are many types of plastic extruder screws, when selecting a model, it is necessary to comprehensively consider the extruder model parameters and processing materials.