Molds & Tooling
3 조회수
PBT Hot Runner Forbidden Zone
문제 현상
After PBT adopts a hot runner, degradation occurs in the manifold, the product is burnt and discolored, and drooling is difficult to control
원인 분석
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
해결 방법
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
핵심 요약
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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