Molds & Tooling
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PBT product warpage (uneven cooling)
Problem Phenomenon
Flat plate products warp, and the deformation pattern changes after adjusting mold temperature.
Cause Analysis
Uneven mold cooling makes crystallization shrinkage inconsistent across parts; PBT has high crystallinity and is sensitive to temperature difference.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Balance cooling water circuits; ②detect cavity temperature distribution; ③extend cooling for setting; ④optimize holding pressure curve.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Uneven cooling is the main cause of warpage of crystalline materials; water circuit balance is the fundamental solution.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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