Extrusion & Post
4 조회수
HDPE Melt Fracture
문제 현상
HDPE extrusion surface is rough like sharkskin
원인 분석
When shear rate exceeds the critical value, melt fracture occurs and the surface becomes periodically rough; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
해결 방법
Reduce line speed; increase melt temperature; polish die lip flow channel; add PPA additive; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
핵심 요약
Melt fracture is treated by reducing speed, increasing temperature, and adding PPA; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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