Injection Molding
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LLDPE '2079851475616104452 advantages
Problem Phenomenon
LLDPE injection molded parts are harder and stronger than LDPE, tougher and more stress-crack resistant than HDPE
Cause Analysis
LLDPE density 0.915-0.935, tensile strength 18-22MPa, between LDPE and HDPE; elongation at break 400-700% gives excellent toughness; ESCR is extremely good, the best among the three major polyethylenes
Solution
①Choose LLDPE for stiffness-toughness balance needs; ②prefer LLDPE in stress cracking scenarios; ③select specific grades by density and melt index; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE is the performance balance point among the three major polyethylenes; its ESCR advantage makes it irreplaceable in containers and pipes; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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