In the production process of blow molded products, there are three actions: stretching, first blowing, and second blowing. The time for these three 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 blown bottle. Therefore, it is necessary to adjust the starting and ending timing of stretching, stretching speed, pre blowing start and end timing, pre blowing pressure, pre blowing flow rate, etc. If possible, it is best to control the overall temperature distribution of the preform and the temperature gradient of the inner and outer walls of the preform.
During the rapid blow molding and cooling process, induced stress is generated inside the bottle wall. For inflatable beverage bottles, they can withstand internal pressure, which is beneficial, but for hot filled bottles, it is necessary to ensure that they are fully released above the glass transition temperature.
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