The PET bottle is a PET container which is made of poly […]
The PET bottle is a PET container which is made of polyethylene terephthalate (PET) and is added with a corresponding organic solvent and then heated, heated, and then blown, blown, or injection molded through a PET bottle mold.
PET bottles are not easy to break, low cost, high transparency, food-grade raw materials, etc. So everyone knows how it is made? Then follow the Jilian mold to do a specific understanding!
PET preforms blow molding process is a two-way stretching process. During this process, the PET chain is bidirectional extended, oriented and aligned, thereby increasing the mechanical properties of the bottle wall and improving the tensile, tensile and impact strength. And has a good air tightness. Although stretching helps to increase the strength, it cannot be excessively stretched. The tensile inflation ratio should be 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 4.5 mms.
The blowing is carried out between the glass transition temperature and the crystallization temperature, and is generally controlled between 90 and 120 degrees. In this interval, PET is in a highly elastic state, which is quickly blow molded, cool and shaped to become a transparent bottle. In the one-step method, this temperature is determined by the length of the cool time of the injection molding process, so it is necessary to connect the two injection-boiler positions. In the blow molding process: stretching - one blowing - two blowing, the three movements are very short, but must be well coordinated, especially the first two steps determine the overall distribution of the material, the quality of the blowing. Therefore, it should be adjusted: stretching to start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc., if possible, controlling the overall temperature distribution of the preform, the inner and outer walls of the preform Temperature gradient. In the process of rapid blow molding and cool, induced stress is generated in the bottle wall. For carbonated beverage bottles, it is resistant to internal pressure and is beneficial, but for hot-fill bottles it is guaranteed to be fully released above the glass transition temperature.
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