Process and Structure of Screw Extruder


Extrusion molding, also known as press molding, is a molding method that heats and melts the polymer solid material into a melt, and uses the extrusion effect of the screw to push the viscous fluid material through the die to form a continuous body with a cross-sectional shape similar to the die shape. The corresponding equipment is called a screw extruder.

Screw extruder extrusion process

Material (granules or powder) – added to the extruder – heated and transported forward – the material becomes a melt and is extruded – the melt enters the die head for molding – the molding sleeve is molded – cooled in the cooling tank – hauled – cut (or coiled)

Classification of screw extruder

  • According to the number of screws, it can be divided into single-screw extruder and multi-screw extruder;
  • According to whether it can be vented, it can be divided into venting extruder and non-venting extruder;
  • According to the presence or absence of screws, it can be divided into screw extruder and screwless extruder;
  • According to the position of the screw in space, it can be divided into horizontal extruder and vertical extruder.

Screw Extruder

Lab Screw Extruder can be applied to the mixing, plasticizing and extrusion of engineering plastics, modified plastics, masterbatch and other high polymers with the features of uniformly dispersed, plastics coloring and filling to modify. It can be used in laboratory tests, quality control, teaching research and small-scale production.
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The efficiency of small extruder in laboratory is mainly reflected in high output, low energy consumption and low manufacturing cost. In terms of function, extruder has been not only used in polymer extrusion molding and mixing process, its use has been widened to food, feed, electrode, explosives, building materials, packaging, pulp, ceramics and other fields.

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