Molds & Tooling
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PP Shrinkage 1.0-2.5 Management
Problem Phenomenon
[Problem Phenomenon] PP product dimensional deviation is large, shrinkage fluctuates obviously
Cause Analysis
PP shrinkage 1.0-2.5% is a wide range, greatly affected by wall thickness, holding pressure, mold temperature, and crystallization; directional (flow/transverse) differences are also obvious; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Measure shrinkage compensation according to grade and wall thickness; lock mold temperature and holding pressure; glass fiber grades have lower shrinkage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP shrinkage 1.0-2.5% is a wide range; actual measurement compensation and locked process; 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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