Injection Molding
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LLDPE injection molded container
Problem Phenomenon
LLDPE injection molded containers are more stress-crack resistant than HDPE, but insufficient rigidity causes stacking deformation
Cause Analysis
LLDPE containers are flexible and crack-resistant, but rigidity and strength are lower than HDPE; creep deformation under stacking load; select material by contents and stacking requirements; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Choose LLDPE for stress-cracking-sensitive scenarios; ②choose HDPE for high-stacking rigidity needs; ③compensate rigidity with structural reinforcing ribs; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE containers are a trade-off between flexibility and rigidity; choose LLDPE when ESCR is prioritized, HDPE when stacking is prioritized; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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