The
blow molding process of PET bottle
blowing machine is a bidirectional stretching process. In this process, the PET chain is bidirectionally extended, oriented and arranged, thereby increasing the mechanical properties of the bottle wall and improving the stretch, tensile and impact resistance. Strength and excellent air tightness. Although stretching helps to increase strength, it should not be overstretched, and the stretch-inflation ratio should be controlled well. Blowing is carried out between the glass transition temperature and the crystallization temperature, usually between 90 and 120 degrees. In this interval, the PET exhibits a highly elastic state, and it becomes a transparent bottle after being rapidly blown and cooled and shaped. In the one-step method, this temperature is determined by the length of the cooling time in the injection molding process (such as the Aoki bottle blowing machine), so the relationship between the injection and blowing stations must be connected. The blow molding process includes: stretch-blow once-blow twice. The three actions have a short time, 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: stretch start timing, stretch speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing air flow, etc. If possible, it is best to control the overall temperature distribution of the preform, inside the preform The temperature gradient of the outer wall. In the rapid blowing and cooling process, induced stress occurs in the bottle wall. For gas-filled beverage bottles, it can resist internal pressure and has advantages, but for PET bottle blowing machines, it is necessary to ensure that it is fully released above the glass transition temperature.
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