In the production process of blow molded products, there are three actions: stretching, first blow, and second blow. The time for these three actions is very short, but they must be coordinated well, especially the first two steps determine the overall distribution of materials and the quality of blow molding. Therefore, it is necessary to adjust the starting and ending times of stretching, stretching speed, pre blowing start and end times, pre blowing pressure, pre blowing flow rate, etc. If possible, it is best to control the overall temperature distribution of the bottle preform and the temperature gradient of the inner and outer walls of the bottle preform< During the rapid blow molding and cooling process, induced stress is generated inside the bottle wall. For inflatable beverage bottles, they can resist internal pressure and have benefits, but for hot filled bottles, it is necessary to ensure that they are fully released above the glass transition temperature
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