Blow Molding
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LDPE vs HDPE Comparison
Problem Phenomenon
HDPE products are too hard with poor hand feel, but after switching to LDPE the rigidity is insufficient, with repeated switching back and forth
Cause Analysis
LDPE is soft and tough but has low rigidity and strength; HDPE is stiff with high strength but feels hard; density is the performance watershed; blending can balance the two; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Select LDPE for flexibility requirements and HDPE for rigidity requirements; ② use LDPE/HDPE blending for balanced requirements; ③ density is the first parameter for selection
Key Takeaway
LDPE and HDPE divide work by flexibility and rigidity; blending is the middle route, and density determines the performance coordinates; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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