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1. Too much material at the bottom of the bottle
2. The pre-blowing time is too late
3. The pre-blowing pressure is too low
4. The pre-blowing flow is too small
5. The bottom temperature is too low
1. Too much material at the bottom of the bottle
2. The pre-blowing time is too late
3. The pre-blowing pressure is too low
4. The pre-blowing flow is too small
5. The bottom temperature is too low
