Blow Molding
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LDPE Die Gap Comparison
Fenómeno del problema
Processing LLDPE with the LDPE die gap results in high back pressure, low output, and melt fracture.
Análisis de la causa
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.
Solución
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.
Conclusión clave
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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