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The 5 Steps During Bottle Forming Process For Blow Molding Machine

May 18, 2022

The 5 Steps During Bottle Forming Process For Blow molding machine


1. Stretch (direction)

2. Pre-blow (preliminary bottle forming)

3. High pressure air blowing (bottle shaping)

4. Exhaust (empty the high pressure air in the bottle cavity)

5. Third blow (also known as cooling blow, for hot filling only)


The time for the above actions is very short, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the bottle.


Therefore, it is necessary to adjust well below parameters:

the starting timing of stretching,

the stretching speed (determined by the guide rail),

the starting and ending timing of pre-blowing,

the pressure of pre-blowing,

the flow of pre-blowing, etc.


If possible, it is best to control the overall preform temperature distribution of the preform, the temperature gradient of the inner and outer walls of the preform.

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