Insufficient blow pressure causing external wrinkles, too many stretch rods causing material to press down;
Internal wrinkles are more common. The preform head is overheated or the stretch pressure is delayed at the beginning.
Solutions:
1. Ensure that the blow time on the mold is consistent and stable.
2. Do not overheat the preform head.
3. Ensure that the delay time from the start of stretching to entering the blow is not too long.
The bottle is overheated.

The bottle is overheated, causing recrystallization inside or outside the bottle, causing the bottle to explode
Solution:
1. The stretching time is too long
2. Lower the cooling plate position

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