يودا

1. Check the gap between the stretch rod and the bottom mold, and verify it with random tooling.

2.Whether the bottom temperature of the bottle is too high. 

3. The pre-blowing flow is too large. 

4. The pre-blowing pressure is too high. 

5. The pre-blowing time is too early. 

6. The pre-blowing time is too long. 

7. The heating temperature is not suitable. 

8. Check whether the stretching rod is bent. 

9. Check whether the preform is eccentric.