Molds & Tooling
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PP Draft Angle Design
Problem Phenomenon
[Problem Phenomenon] PP products are scratched during demolding; insufficient draft
Cause Analysis
PP has good toughness but large shrinkage; clamping force increases with shrinkage; draft angle 1-2° minimum, increased for textured surfaces; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Draft angle ≥1-2°; increase for textured surfaces; polish along the demolding direction; 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
PP's large shrinkage means strong clamping; draft angle starts at 1-2°; 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 future problems
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