Processing Machinery
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PPO Melt Discoloration After 2 Hours Residence
Problem Phenomenon
【Problem Phenomenon】After PPO production is interrupted and then restarted, products discolor and performance is abnormal
Cause Analysis
PPO melt cannot be retained at high temperature for a long time; it discolors after residing in the barrel for more than 2 hours, and at this point the entire barrel should be cleaned; lack of interruption management causes degraded material to mix in
Solution
If interrupted for more than 2 hours, thoroughly clean the barrel; scrap the first several mold shots after restart; for short interruptions, cool down and keep warm according to the shutdown grading procedure; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO melt residence of 2 hours is the discoloration line; over time, clean the machine and scrap the first shots at restart; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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