1. The bottom temperature of the bottle is too low.
2. The overall temperature of the preform is low.
3. The pre-blowing time is too early.
4. The pre-blowing pressure is too high.
5. The pre-blowing flow rate is too high.
1. The bottom temperature of the bottle is too low.
2. The overall temperature of the preform is low.
3. The pre-blowing time is too early.
4. The pre-blowing pressure is too high.
5. The pre-blowing flow rate is too high.