The bottle blowing principle of hollow bottle blowing machine
Bottle blowing machine is a process of two-way stretch blow molding process, in this process, PET chains are arranged two-way stretch, orientation, and, thus increasing the bottle wall mechanical performance, can improve the tensile, tensile, impact strength, and has good air tightness. While stretching helps to improve the strength, but not excessively stretching, to control good stretch blow ratio: radial not more than 3. Five to four. 2, the axial not more than 2. 8 ~ 3. 1. The bottle preform thickness not more than 4. 5mm。 Bottle blowing is between the glass transition temperature and crystallization temperature, general control between 90 ~ 120 degrees. PET show is within the range of the high elastic state, blow molding, cooling rapidly become transparent bottle after setting. In step method, the temperature is determined by the cooling time length in molding process ( Such as aoki bottle blowing machine) , so be well matched note & ndash; The relationship between the two stations. Tensile & ndash; blow molding process are: A blow & ndash; Second blow, three action time is very short, but be sure to cooperate well, especially the former two step determines the overall distribution of the material, by the quality of bottle blowing. So to adjust good: stretch the starting time, stretching rate, blow the start and end time, air pressure, blowing air flow, etc, be like likely, can very good control mold temperature distribution, the overall bottle preform, both inside and outside wall temperature gradient. In the process of blow molding, cooling rapidly, bottle wall has induced stress is generated. For filling bottles, it can be resistance to internal pressure, is good, but for hot filling bottles have to make sure it fully above the glass transition temperature for release.
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