Molds & Tooling
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PBT large shrinkage and dimensional deviation
Problem Phenomenon
Large dimensional deviation of products, difficult assembly of precision mating parts.
Cause Analysis
PBT molding shrinkage is large and crystallization behavior is affected by the process; mold temperature and holding pressure fluctuations make actual shrinkage deviate from the design compensation.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Design mold compensation according to measured shrinkage; ②stabilize mold temperature and holding pressure; ③inspect products after aging; ④SPC monitoring of key dimensions.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT shrinkage management relies on measured data and process stability; dimensional judgment of crystalline materials must allow sufficient aging time.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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