Processing Machinery
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PPS Equipment Wear Protection
Problem Phenomenon
After several months of glass fiber PPS production, the screw and barrel wear, metering becomes inaccurate and black specks increase
Cause Analysis
PPS glass fiber grades are highly abrasive; Stellite alloy overlay welding is recommended for screw flights, and bimetallic (such as Xaloy 802 type) lining for the barrel; after wear, metering and plasticizing deteriorate simultaneously
Solution
①Select bimetallic lining for the barrel; ②Stellite overlay welding for screw flights; ③Establish a regular screw clearance inspection system; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Equipment protection for PPS glass fiber grades must be front-loaded; a bimetallic barrel plus Stellite flights is the long-life configuration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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