Processing Machinery
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LCP Screw Configuration and Poor Plasticization
Problem Phenomenon
【Problem Phenomenon】When a general-purpose screw processes LCP, plasticization is uneven and melt temperature fluctuates, and products show unmelted material and stress marks
Cause Analysis
LCP requires a specific screw configuration: Celanese recommends 1/2 feed + 1/4 compression + 1/4 metering zoning, L/D 16-24, compression ratio 2-3:1; the compression section of a general-purpose screw does not match, causing plasticization quality fluctuation
Solution
When conditions permit, switch to the LCP recommended configuration screw; with a general-purpose screw, reduce speed and back pressure, and extend external heating plasticization in the feed section; monitor melt temperature uniformity; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The screw zoning 1/2+1/4+1/4 is the LCP plasticization benchmark; general-purpose screws must be compensated by reducing speed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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