Processing Machinery
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Cross-linked polyethylene extruder screw design mismatch (Variant: strengthened measures)
Problem Phenomenon
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.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Screw compression ratio does not match the density and melting characteristics of cross-linked 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
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Select a screw compression ratio suitable for cross-linked 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
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Screw design needs to match material characteristics and product requirements, and a dedicated screw should be customized when necessary.
Targeted preventive measures need to be taken in different production scenarios.
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