Extrusion & Post
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PPO Extrusion Haul-Off and Solidification Temperature
Problem Phenomenon
【Problem Phenomenon】PPO products deform during extrusion haul-off and have large internal stress
Cause Analysis
PPO material has a relatively high solidification temperature, and this characteristic must be fully considered during extrusion haul-off: hauling off with insufficient cooling easily causes deformation, and uneven cooling accumulates internal stress; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Design cooling length and temperature according to the high solidification temperature; match haul-off speed with cooling capacity; slowly cool thick-walled products after haul-off; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO solidification temperature is high; haul-off rhythm must give way to sufficient cooling; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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