How to choose the barrel screw of the extruder?

Update: 2021/01/25
Summary:

       1, output    The so-called output refers to the […]

       1, output
   The so-called output refers to the output or extrusion volume through a given die under the premise of ensuring the quality of plasticization. As mentioned earlier, the output is generally expressed in kilograms/hour or kilograms/revolution. A good thread screw barrel should have a high plasticizing ability. (Production capacity)
It should be pointed out that low-temperature extrusion is a current development trend. It can improve the quality of extruded products (such as reducing internal stress, etc.), prevent heat-sensitive materials from overheating and decomposition, reduce energy consumption, reduce the burden on the cooling system of the main and auxiliary machines, and increase productivity .
  2, plasticizing quality
  A screw must first be able to produce products that meet the quality requirements.
  3, unit consumption
  Unit consumption refers to the energy consumed per kilogram of plastic (rubber) extruded, generally expressed by N. Where N is power (kw) and Q is output (kg/h).
The larger the value is, the more energy is needed to plasticize the same weight of plastic (rubber), which means the more heating power is consumed, and the more mechanical work done by the motor enters the material through shear and frictional heat. many.
   4. Adaptability
   The so-called adaptability of the screw refers to the adaptability of the screw to process different plastics, match different heads and different products. Generally speaking, the stronger the adaptability, the lower the plasticizing efficiency.
   Therefore, we always hope for a good screw that has both adaptability and high plasticizing efficiency.
   5. The difficulty of manufacturing
A good screw must also be easy to process and manufacture with low cost.

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