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Common technical problems of PET bottle blowing machine

The blow molding process is a bidirectional stretching process, during which the PET chain is bidirectionally extended, oriented and arranged, thereby increasing the mechanical properties of the bottle wall, improving the tensile, tensile and impact strengths, and having good air tightness. Although stretching helps to improve strength, it should not be overstretched. The stretch-blow ratio should be well controlled; the radial ratio should not exceed 3.5-4.2, and the axial ratio should not exceed 2.8-3.1. The wall thickness of the preform should not exceed 4.5mm.

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2023.07

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