Material Drying
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Shot weight fluctuation makes product dimensions and weight uneven
Problem Phenomenon
Shot weight fluctuation makes product dimensions and weight uneven
Cause Analysis
Screw stroke set improperly, metering deviation
Screw check ring worn, material leakage, inaccurate metering
Screw pullback distance unstable
Melt density change in the barrel (PA moisture absorption affects density)
V-P switchover position inaccurate
Solution
Precisely set the screw stroke to ensure stable metering
Replace the worn check ring
Stabilize the screw pullback distance
Cellulose acetate butyrate density 1.15-1.22g/cm³, stable melt needed
Optimize the V-P switchover position
Key Takeaway
Metering requires an intact check ring and stable stroke
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