Material Analysis
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LLDPE die gap 0.060-0.10
Problem Phenomenon
Processing LLDPE with the LDPE die gap, high back pressure, low output, frequent melt fracture.
Cause Analysis
LLDPE's high viscosity requires a die gap of 0.060-0.10 inches, 2-3 times that of LDPE; insufficient gap produces high back pressure and shear heat, and melt fracture and output decline occur simultaneously.
Solution
①LLDPE die gap 0.060-0.10 inches; ②switch die head parameters synchronously during material changeover; ③equip an adjustable die gap for long-term mixed production; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The die gap is the equipment dividing line between LLDPE and LDPE; the 2-3 times difference must be reflected in the changeover procedure; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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