The manufacturer of Twin Screw Extruders for Powder Coatings tells you that the extrusion molding process is a molding processing method with many varieties, many changes, high productivity, strong adaptability, wide application, and a large 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 the extruder screw, 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. The manufacturer of Twin Screw Extruders for Powder Coatings tells you that in addition, the extrusion process is also commonly used in the coloring, mixing, plasticizing, granulation and blending modification of plastics, etc., based on extrusion molding, combined with blowing, stretching And other technologies, and developed into extrusion-blow molding and extrusion tenter molding to manufacture products such as hollow blow molding and biaxial stretching film. It can be seen that extrusion molding is an important method in polymer molding.
There are two types of extrusion equipment: screw extruder and plunger extruder. The former is continuous extrusion, and the latter is intermittent extrusion. It is mainly used for high-viscosity materials, such as polytetrafluoroethylene, high molecular weight polyethylene. Screw extruders can be divided into single-screw extruders and multi-screw extruders. Single screw extruder is the basic extruder in production. Among the multi-screw extruders, the twin-screw extruder has developed rapidly in recent years, and its application has become increasingly widespread. The manufacturer of Twin Screw Extruders for Powder Coatings tells you that at present, in the processing of PVC plastic door and window profiles, twin-screw extruders have become the main production equipment, and single-screw extruders will be phased out. However, in the extrusion processing of other polymers in the extruder, the single-screw extruder still dominates.