Blow Molding
7 조회수
LDPE Die Gap Comparison
문제 현상
Processing LLDPE with the LDPE die gap results in high back pressure, low output, and melt fracture.
원인 분석
LDPE die gap is 0.024-0.040 inches, LLDPE needs 0.060-0.10 inches; LLDPE's high viscosity under a small gap causes high back pressure, strong shear, and melt fracture.
해결 방법
①Set the die gap by material type; ②LLDPE gap is 2-3 times that of LDPE; ③Switch die parameters synchronously when changing material for production; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
핵심 요약
The die gap is the equipment watershed between LDPE and LLDPE; the 2-3 times difference must be reflected in the material change procedure; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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