Blow Molding
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LLDPE vs HDPE comparison
Problem Phenomenon
HDPE containers are too hard and crack easily, after switching to LLDPE, rigidity is insufficient and stacking deforms
Cause Analysis
HDPE is rigid with high strength but average ESCR; LLDPE is flexible with excellent ESCR but low rigidity; density and crystallinity are the performance watershed; make matrix-based selection by application scenario
Solution
①Choose HDPE for rigid stacking; ②choose LLDPE for flexible crack resistance; ③use HDPE/LLDPE blend for balanced needs; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE and HDPE divide work by rigidity and flexibility; ESCR and rigidity are the two major coordinates of selection; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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