PET BOTTLE FAULTS AND SOLUTIONS. - Blow Moulding Controls

13. HEAVY BASE WEIGHT
DESCRIPTION:
Base weight above required weight, poor base clearance may be evident. Thin
shoulder or body may cause poor topload.
CAUSE:
1. Pre-blow pressure too low.
2. Pre-blow cam too late.
3. Poor heating profile resulting in poor distribution of material.
4. If only one station is affected then flow restrictor may be closed
too many turns.
SOLUTION:
1. Increase pre-blow pressure.
2. Move pre-blow cam earlier.
3. Adjust heating profile.
4. If only one station is affected then open flow restrictor to increase flow of
pre-blow air.