How the blow molding machine works
Two-step bottle blowing is the method currently used by most blow molding machines. The so-called two-step method is to first make plastic raw materials into preforms, and then blow the bottles. Currently, environmentally friendly plastics made of PET are commonly used. 1. Blowing principle The blowing process of the bottle blowing machine is divided into two parts 1. Preheating The preform (embryo) is irradiated by an infrared high temperature lamp to heat and soften the bad (embryo) body part of the preform (embryo). 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 cool it. 2. Blow molding This stage is to place the preheated preform (preform) into the already prepared blow mold, and inflate it with high pressure. Blow and draw the preform (preform) into the desired bottle. The automatic bottle blowing machine completes the two operations of blowing the bottle together through the operation of the manipulator, eliminating the process of manually putting the preheated bottle into the blow mold in the middle. 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 bidirectional stretching 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. , tensile, impact strength, and has 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 3.5~4.2, and the axial direction should not exceed 2.8~3.1. The wall thickness of the preform should not exceed 4.5mm. Blowing is carried out between the glass transition temperature and the crystallization temperature, which is generally controlled between 90 and 120 degrees. In this range, PET shows a high elastic state, and it becomes a transparent bottle after fast blowing, cooling and setting. In the one-step method, this temperature is determined by the cooling time during the injection molding process, so the relationship between the injection and the blowing and the two stations should be well connected. In the blow molding process, there are: stretching - one blow, one blow and two blows. The time of 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 bottle. Therefore, it is necessary to adjust: the starting timing of stretching, the stretching speed, the starting and ending timing of pre-blowing, the pre-blowing pressure, the pre-blowing flow rate, etc. If possible, the overall temperature distribution of the preform can be controlled. The temperature gradient of the outer wall. In the process of rapid blow molding 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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