Extrusion & Post
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LDPE Fine Powder Slip Agent
Problem Phenomenon
Extrusion output suddenly drops and film thickness becomes thinner, and after increasing the screw speed the film thickness surges again
Cause Analysis
LDPE fine powder contains 8-12% slip agent, far higher than normal material; fine powder accumulates on the hopper wall and then falls off, and the instantaneous high concentration of slip agent lubricates the screw, so output and film thickness drop sharply and then rebound
Solution
① Regularly clean the conveying system to prevent fine powder accumulation; ② include hopper inner wall cleaning in maintenance; ③ check fine powder first rather than adjusting speed when output is abnormal; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Fine powder slip agent is a hidden trap of the LDPE conveying system; check the hopper first for abnormal fluctuations, and do not blindly adjust the speed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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