What is the process of the blow molding machine?
With so many blow molding machines, how did he produce them? We will specifically introduce to you what the production process of the automatic blow molding machine is: At present, most blow molding machines are still two-step blow molding machines, that is, the plastic raw materials must be made into preforms, and then the blowing is completed. Today Also commonly used is the environmentally friendly plastic made of PET. 1. The blowing process of the bottle blowing machine is divided into two parts 1. Preheating The preform (preform) is irradiated by an infrared high temperature lamp to heat and soften the bad (preform) body part of the preform (preform). , In order to maintain the shape of the bottle mouth, the preform (preform) mouth does not need to be heated, so a certain cooling device is required to complete the cooling and control. 2. Bottle blowing molding In this stage, the preheated preforms (embryos) are discarded and donated to the already prepared blow molds, and high-pressure inflation is completed inside them. Blow and draw the preform (preform) into the desired bottle. The automatic bottle blowing machine completes the two holdings of the blowing bottle together through the control of the manipulator, which eliminates the process of manually placing the preheated preform into the blow mold in the middle. Greatly accelerates the rate of childbirth. The molding diagram of the bottle blowing machine 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 arranged in two directions, thereby increasing the thickness of the bottle wall. Mechanical properties, improved tensile, tensile, impact strength, and good air tightness. Although stretching helps to improve the strength, it should not be stretched too much. It is necessary to control the stretch-inflation ratio: 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 finished between the glass transition temperature and the crystallization temperature, which is also 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 cooling time in the injection molding process (such as the Aoki blow molding machine), so it is necessary to connect the two stations of injection and blowing. In the blow molding process, there are: stretching—one blow—second blow. The time for the three actions is very short, but they must be well done together. In particular, the first two steps determine the overall distribution of the material and the quality of the blowing. Therefore, it is necessary to take good care of: stretching start opportunity, stretching rate, pre-blowing start and end opportunity, pre-blowing pressure, pre-blowing flow, etc. If possible, it is very good to control the temperature distribution of the whole preform, the preform The temperature gradient of the inner and outer walls. In the process of rapid blow molding and cooling, there is a seductive stress in the bottle wall. For carbonated beverage bottles, it can resist internal pressure, which is beneficial, but for hot-fill bottles, it is necessary to ensure that it is fully released above the glass transition temperature.
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