Material Analysis
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LDPE Processing Temperature Upper Limit
Problem Phenomenon
After raising temperature to improve plasticizing, the product discolors, molecular weight decreases, and performance deteriorates.
Cause Analysis
Although LDPE has good thermal stability, long-term high temperature still causes thermal oxidative degradation; degradation accelerates above 280℃; molecular chain scission at high temperature reduces both strength and toughness.
Solution
①Control processing temperature below 280℃; ②Avoid long-term high-temperature residence; ③When discoloration occurs, immediately lower temperature and purge; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LDPE's temperature upper limit also exists; the 280℃ red line plus residence management prevents oxidative degradation; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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