Molds & Tooling
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PBT Poor Demolding
Problem Phenomenon
The product sticks to the mold and is scratched, deforms during ejection, and improvement is limited after mold temperature and holding pressure adjustment
Cause Analysis
PBT poor demolding stems from excessive holding pressure, too high mold temperature and insufficient cooling, and insufficient draft angle; glass fiber material has large mold-gripping force; polishing and draft angle are the mold-side foundation
Solution
①Reduce holding pressure and mold temperature; ②Ensure draft angle ≥0.5°; ③Polish the cavity to reduce friction; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT poor demolding is investigated along three lines: pressure, temperature, and structure; the basic condition of the mold is fundamental; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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