Processing Machinery
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PEI Barrel and Screw Design
Problem Phenomenon
In PEI processing, poor plasticizing and wear problems coexist; general-purpose screw configurations barely cope, and long-term stability is poor.
Cause Analysis
PEI recommends a bimetallic barrel; screw L/D ratio 20:1, compression ratio 2.2:1, feed zone 5 flights, compression zone 1 flight, metering zone 4 flights; avoid abrupt changes to reduce shear; general-purpose screws of 16~24:1 and 1.5~3.0:1 can also be used.
Solution
①Prioritize the dedicated configuration: L/D 20:1, compression ratio 2.2:1; ②bimetallic barrel material; ③general-purpose screws of 16~24:1 can also be used successfully; ④vented barrels are not recommended.
Key Takeaway
PEI screws have detailed official design specifications; bimetallic barrels are the standard wear-resistant configuration; vented barrels are a clear taboo.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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