Molds & Tooling
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PBT product warpage (uneven cooling)
Problembeschreibung
Flat plate products warp, and the deformation pattern changes after adjusting mold temperature.
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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