The automatic bottle blowing machine combines the two operations of bottle blowing through the operation of the manipulator, eliminating the need for the manual process of putting the preheated preform into the blowing mold. Greatly accelerate the rate of consumption, the process flow of the blow molding machine The blow molding process of the blow molding machine is a two-way stretch process, in this process, the PET chain is bidirectionally extended, oriented and arranged.
Thereby increasing the mechanical properties of the bottle wall, improving the tensile, tensile, and impact strength, and has a good air tightness. Although stretching helps to increase the strength, it should not be over-stretched. It is necessary to control the stretch-inflation ratio: do not exceed 3.5 to 4.2 times in the radial direction and 2.8 to 3.1 times in the axial direction. The wall thickness of the preform should not exceed 4.3mm.
Bottle blowing is stopped between the glass transition temperature and the crystallization temperature, and it is generally controlled between 90 and 110 degrees. In this interval, the PET is in a highly elastic state. It becomes a transparent bottle after rapid blow molding and cooling and shaping. The blow molding process includes: stretching-blowing once-blowing twice. The three actions have a short time, but they must be coordinated. Good, especially the first two steps determine the overall distribution of materials and the quality of blowing bottles.
Therefore, it is necessary to set the parameters: stretching start opportunity, stretching speed, pre-blowing start and end time, pre-blowing pressure, pre-blowing flow, etc., if possible, better control the overall temperature distribution of the preform, The temperature gradient of the inner and outer walls of the preform will induce stress in the bottle wall during the rapid blowing and cooling process.
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