• Technology For Bottle Blowing
    Technology For Bottle Blowing

7. Why is there a button-shaped circle at the bottom of the bottle? 

1. The bottom temperature is too high2. The pre-blowing time is too late3. The pre-blowing flow is t···

　

1. The bottom temperature is too high 

2. The pre-blowing time is too late 

3. The pre-blowing flow is too small 

4. The pre-blowing pressure is too low

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