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Bottle blowing machine, bottle blowing process and the analysis of common problems

by:Yosion Machinery     2020-09-30
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. Bottle blowing machine blow molding process are: tensile & ndash; 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, if possible, best can control the temperature of the bottle preform general distribution, 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. Bottle blowing machine, bottle blowing common problems and the solution 1. On thick thin: delay the blowing time, or to reduce pressure, reduce the gas flow rate. 2. Under the thick thin: contrary to the above. 3. There are buckling under the bottleneck that the blow too late or pressure is too low, or the billet cooling. 4. The bottom white: bottle preform is too cold; Too much tension; Preliminary blowing too early or blowing pressure is too high. 5. The bottom of the bottle have a magnifying glass phenomenon: bottle base too much; Blow too late, blowing pressure is too low. 6. At the bottom of the bottle there is buckling, temperature is too high, Gate in cooling bad) ; Preliminary blowing wind pressure is too low, too late flow is too small. 7. The whole bottle opacity ( Opaque) : cool enough. 8. Local white: overstretch, where the temperature is too low, or blow too soon, or touched the tensile bar. 9. Eccentric bottom: with bottles of billet temperature, tensile, blow, high pressure, etc may have relations. Lower the temperature in the bottle preform; Speed up the drawing; Check the lever of the gap between head and bottom die; Delay the blow, reduce the pressure of blowing in advance; Delay the high-pressure blow; Check whether the bottle preform is eccentric.
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