Molds & Tooling
2 views
PP Burnt Trapped Air
Problem Phenomenon
【Problem Phenomenon】PP end rib positions burnt and blackened
Cause Analysis
Trapped air adiabatic compression heats up and burns; poor venting plus high melt temperature; high incidence at end deep-cavity rib positions; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Strengthen venting at end rib positions; reduce final-stage injection speed; call back melt temperature from the upper limit; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For PP burnt, first clear venting, reduce final speed and control melt temperature; 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 similar problems in the future
Was this helpful?
0 people found this helpful
Thank you for your feedback!