Production status of twin-screw extruder

Twin-screw extruder screw barrel is the molding processing method with the most varieties, the most changes, high productivity, strong adaptability, wide application and the largest proportion of output in the field of polymer processing. Extrusion molding is to make the polymer melt (or viscous fluid) pass through a die of a certain shape under the extrusion of a twin-screw extruder, and the product is a continuous profile with a constant cross-sectional shape.
The extrusion molding process is suitable for all polymer materials. Almost all thermoplastics can be molded, and it can also be used for thermosetting plastics, but it is limited to a few thermosetting plastics such as phenolic formaldehyde. Plastic extruded products include pipes, plates, rods, sheets, films, monofilaments, cable coatings, various profiles, and composites of plastics and other materials. About 50% of thermoplastic products are currently formed by extrusion. In addition, the extrusion process is also commonly used in the coloring, mixing, plasticizing, granulating and blending modification of plastics. Blow molding and extrusion tenter molding manufacture products such as hollow blow molding and biaxially stretched film. It can be seen that extrusion molding is the most important method in polymer molding.
There are two types of twin-screw extruders and plunger extruders. The former is continuous extrusion, and the latter is intermittent extrusion. It is mainly used for high-viscosity materials, such as polytetrafluoroethylene, ultra-high molecular weight poly vinyl. Screw extruders can be divided into single-screw extruders and multi-screw extruders. Single screw extruder is the most basic extruder in production. Among the multi-screw extruders, the twin-screw extruder has developed the fastest in recent years, and its application is becoming more and more extensive. At present, in the processing of PVC plastic door and window profiles, the twin-screw extruder has become the main production equipment, and the single-screw extruder will be phased out.

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