Molds & Tooling
4 조회수
Yellow-brown or black specks appear locally on the product
문제 현상
Yellow-brown or black specks appear locally on the product, accompanied by burnt odor, burnt areas rough and carbonized on the surface
원인 분석
Barrel temperature too high (far exceeding the 170-230°C upper limit), severe material degradation
Screw speed too fast, excessive shear, thermal degradation
Poor mold venting, gas compressed and heated
Residence time too long, material repeatedly heated in the barrel
Regrind ratio too high, degradation accumulation
해결 방법
Lower barrel temperature to the reasonable 170-230°C range
Reduce screw speed to reduce shear heat
Improve mold venting to prevent gas compression heating
Reduce residence time, shorten cycle time
Reduce regrind ratio ≤15%
핵심 요약
Burnt is caused by overheating degradation or poor venting
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