Extrusion & Post
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PPO Extrusion Internal Stress Deformation
Problem Phenomenon
[Problem Phenomenon] Large PPO extruded products are not straight and bend after cooling
Cause Analysis
High solidification temperature and uneven cooling accumulate internal stress; mismatch between haul-off speed and cooling aggravates deformation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Design cooling length and temperature gradient according to the high solidification temperature; match haul-off speed; post-process large parts to relieve stress; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The root of PPO extrusion deformation is uneven cooling, and post-processing is the remedial bottom line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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