ユダ

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.