Extruder screw thread element manufacturer introduces the development of extruder industry

Extruder screw thread element manufacturers believe that extrusion technology is a molding processing method with many varieties, many changes, high productivity, strong adaptability, wide application and large output in the field of polymer processing. Extrusion molding refers to the polymer melt (or viscous fluid) under the extrusion action of the extruder screw, through a certain shape of the mold molding, the product is a continuous profile with the same cross-sectional shape.

Extruder screw thread element manufacturers believe that the extrusion process is suitable for all polymer materials. It can be used to mold almost all thermoplastics and thermosetting plastics, but only a few thermosetting plastics such as phenolic. Plastic extrusion products include pipes, plates, rods, sheets, films, monofilaments, cable cladding, various profiles and composites of plastics and other materials. Currently, about 50% of thermoplastic products are formed by extrusion. In addition, extrusion technology is often used for coloring, mixing, plasticizing, pelletizing and blending modification of plastics. Based on extrusion molding, combined with inflation, stretching and other technologies, it has developed into extrusion blow molding and extrusion tenter molding to manufacture hollow blow molding and biaxially stretched film. It can be seen that extrusion molding is the most important method in polymer molding.

Extruder screw thread element manufacturers believe that there are two kinds of extrusion equipment: screw extruder and plunger extruder. The former is continuous extrusion, the latter is intermittent extrusion, mainly used for molding PTFE, UHMWPE and other high viscosity materials. Screw extruders can be divided into single-screw extruders and multi-screw extruders. The single-screw extruder is the basic extruder in production. In recent years, twin-screw extruders have developed rapidly in multi-screw extruders and are more and more widely used. 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.