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Plastic Extruder Principle

Compression and shearing etc, solid plastic into uniform melt and melt into the next process. Melt production involves mixing color masterbatch, additives and blending resin and grinding process. Finished in concentration and temperature of the melt must be uniform. Pressure must be large enough to viscous polymer extrusion.


Now has a plastic extruder screw barrel and spiral road do all of the above process. Plastic pellets through the barrel end of the hopper into the barrel, and then through the screw to the other end of the barrel. In order to have enough pressure on screw thread depth drop with increasing distance of the hopper. External heating and in plastics and screw the heat generated due to friction, makes plastic soft and melting. Different polymers and various applications, design requirements for plastic extruder is often different. Involves discharge, many option on multiple port along the special screw mixers, melt cooling and heating, with or without an external source of heat (adiabatic extruder), the clearance between the screw and barrel changes in relative size, and the number of screws. For example, double-screw plastic extruder, compared with single-screw plastic extruder, melt can get more mixed. Tandem extrusion is the first plastics extruder melts, as the supply of raw materials and the second plastic extruder, normally used in the production of extruded polyethylene foam.


D l plastic extruder size is the diameter of the screw (d) and the length of the screw (l) with a diameter of d L/D (d) ratio (l/d. Plastic extruding machine usually consist of at least three paragraphs. The first paragraph, near the L/D) Hopper, is a feeding zone. It allows material at a relatively steady rate into the extruder. Under normal circumstances, in order to avoid feeding channel of the plug, which will remain a relatively low temperature. Second part is compressed, this melt and pressure increases. Transition from feeding of the compression section can suddenly or gradually (quietly) finally metering section of a part,. Next to the plastic extrusion machine exit. Main function is out of the extruder material is uniform. In this section in order to ensure uniformity of composition and temperature, materials should have enough time ...