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Blowing principle and process flow of bottle blowing machine

by:Yosion Machinery     2022-08-09
The blowing principle and process of the blowing machine Most of the blowing machines are still two-step blowing machines, that is, it is necessary to make the plastic raw materials into preforms, and then blow them. Today, PET is usually used. Made of environmentally friendly plastic. 1. Blowing principle The blowing process of the blowing machine is divided into two parts. Adhere to the shape of the bottle mouth, the preform (preform) mouth does not need to be heated, so a certain cooling device is required to cool it. 2. During the blow molding process of the blow molding machine, the preheated preform (preform) is placed in the blow mold that has already been prepared, and high-pressure inflation is performed inside it. Blow and draw the preform (preform) into the desired bottle. The automatic bottle blowing machine completes the two blowing operations together through the operation of the manipulator, eliminating the need for the center to manually put the preheated preform into the blow mold. Greatly accelerated the rate of production. 2. The process flow of the bottle blowing machine The blow molding process of the bottle blowing machine is a two-way stretching process. In this process, the PET chain is extended, oriented and placed in both directions, thereby increasing the mechanical properties of the bottle wall and improving the stretching process. Tensile, tensile, impact strength, and has excellent air tightness. Although stretching helps to improve the strength, it should not be stretched too much, and the stretch-blow 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. Blowing is carried out between the glass transition temperature and the crystallization temperature, usually 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 length of the cooling time in the injection molding process (such as the Aoki blow molding machine), so it is necessary to connect the injection—Blow the link between the two stations. In the blow molding process: stretching—blow once—In the second blow, the time for 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. Therefore, it is necessary to adjust: stretching start opportunity, stretching speed, pre-blowing start and end opportunity, pre-blowing pressure, pre-blowing flow, etc., it is best to control the overall temperature distribution of the preform, the temperature gradient of the inner and outer walls of the preform .
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