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Operation matters of PET automatic blow molding machine

by:Yosion Machinery     2022-05-20
The operation of the PET automatic blow molding machine---as the name implies, is the operation process. The PET automatic bottle blowing machine is a bidirectional stretching process during the bottle blowing 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 stretching and tensile strength. , Impact strength, and good air tightness. Although stretching helps to improve the strength, it should not be stretched too much. The stretch-inflation ratio should be well controlled: the radial direction should not exceed 3.5 to 4.2, and the axial direction should not exceed 2.8 to 3.1. The wall thickness of the preform should not exceed 4.5mm. The PET automatic blow molding machine equipment is carried out between the glass transition temperature and the crystallization temperature, which is 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 process of blowing, the PET automatic bottle blowing machine has: from stretching to secondary blowing, the time for the two actions is very short, and it must be well adjusted: stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc., if possible, it is very good to control the overall temperature distribution of the preform and the temperature gradient of the inner and outer walls of the preform. In the process of rapid blowing and cooling, induced stress is generated in the bottle wall. For carbonated beverage bottles, it can resist internal pressure, which is good, but for hot-fill bottles, it is necessary to ensure that it is fully released above the glass transition temperature.
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