Processing Machinery
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Heat-resistant polyethylene extruder screw design mismatch
Fenómeno do problema
Products are plasticized unevenly, output is low or energy consumption is high, and the screw does not match the raw material characteristics.
Screw design directly affects plasticizing quality, output and energy consumption.
Análise das causas
(1) Screw compression ratio does not match the density and melting characteristics of heat-resistant polyethylene
(2) Screw length-to-diameter ratio insufficient, plasticizing section length not enough
(3) Improper design of the transition section between screw head and die head
(4) Screw mixing elements not suitable for this material
(5) Improper screw flight depth design
Solução
(1) Select a screw compression ratio suitable for heat-resistant polyethylene, generally 2.5-4.0
(2) Screw length-to-diameter ratio at least 25:1 to ensure full plasticization
(3) Optimize the transition section between screw head and die head, eliminate stagnation zones
(4) Select suitable mixing elements (pins, barriers, etc.) according to material characteristics
(5) Ask professional screw designers to optimize flight parameters according to material characteristics
Conclusão principal
Screw design needs to match material characteristics and product requirements, and a dedicated screw should be customized when necessary.
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