Molds & Tooling
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PBT Hot Runner Forbidden Zone
Problembeschreibung
After PBT adopts a hot runner, degradation occurs in the manifold, the product is burnt and discolored, and drooling is difficult to control
Ursachenanalyse
Both PBT and PET are not suitable for hot runners: the drooling problem caused by low viscosity is difficult to solve by decompression or temperature adjustment; and PBT easily stays and degrades in the manifold, causing burning and discoloration
Lösung
①Avoid using hot runner systems for PBT; ②If it must be used, fully evaluate and demonstrate; ③Make the main runner as short as possible and 0.5-1mm larger than the nozzle; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
The hot runner is a process forbidden zone for PBT; the two major risks of low-viscosity drooling and manifold degradation are superimposed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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