The blow molding
process of the bottle blowing machine is a bidirectional stretching process. During this process, the PET chains are bidirectionally extended, oriented and arranged, thereby increasing the mechanical properties of the bottle wall and improving the tensile, tensile and impact strength. And has good air tightness. Although stretching helps to improve the strength, it should not be stretched too much, and the stretch-inflation ratio should be controlled well: the radial direction should not exceed 3.5-4.2, and the axial direction should not exceed 2.8-3.1. The wall thickness of the preform should not exceed 4.5mno. The blowing is carried out between the glass transition temperature and the crystallization temperature, generally controlled between 90 and 120 degrees. In this range, PET exhibits a high elastic state, and it becomes a transparent bottle after rapid blow molding, cooling and setting. In the one-step method, this temperature is determined by the cooling time in the injection molding process (such as the Aoki blow molding machine), so it is necessary to connect the relationship between the injection and the blowing of the two stations. In the blow molding process, there are: stretching once, blowing once, blowing twice, and the time of the 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 blowing bottle. Therefore, it is necessary to adjust the stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc. of the blow molding machine. If possible, it is best to control the overall temperature of the preform distribution, the temperature gradient of the inner and outer walls of the preform. During the rapid blow molding and cooling process of the automatic blow molding machine, induced stress is generated in the bottle wall. For inflatable beverage bottles, it can resist internal pressure, which is good, but for hot-fill bottles, it is necessary to ensure that it can fully release the internal stress above the glass transition temperature.
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