Molding Process
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LLDPE pipe application
Problem Phenomenon
LLDPE pipes are more flexible than HDPE, but pressure resistance is insufficient and applications are limited
Cause Analysis
LLDPE has good flexibility and excellent ESCR, suitable for low-pressure and ground heating pipes; but rigidity and strength are lower than HDPE, unsuitable for high-pressure water supply pipes; select material by pressure rating
Solution
①Choose LLDPE for low-pressure and ground heating pipes; ②choose HDPE or PE-RT for high-pressure water supply pipes; ③prefer LLDPE in ESCR-sensitive scenarios; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE pipes are applied by pressure grading; flexibility and ESCR advantages are fully utilized in low-pressure scenarios; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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