Hot filling technology for PET Bottle （part one）
PET bottle Hot filling technology is popular used in soy sauce and beverage such as tea, health, energy drinks. PET hot filling bottles are widely used in China's beverage industry because of its safety and highly cost-effective and its prospect is very broad. The article mainly discusses the PET hot filling bottle blowing technology.
Tag: PET hot filling bottle, bottle blowing technology
Preface:
PET hot filling uses PET hot filling raw materials, and its IV requirement is > 0.81cm3 / g. The blow molding process of blowing machine is a two-stage stretching process. In this process, the PET material chain extends, orients and arranges in two directions, thereby increasing the mechanical properties of the bottle wall, improving the anti-stretch tension and impact-resistance, and having good air tightness. Although stretching helps to improve the strength, but also cannot be over-stretched, to control the stretch blow-up ratio: radial should not exceed
3.5 ~ 4.2, axial should not exceed 2.8 ~ 3.1. The bottle wall thickness of the bottle should not exceed 4.5 mm.
The bottle blowing is between the glass transition temperature and the crystallization temperature, with the temperature range of 90 and 120 degrees. During this period, PET shows a high elastic state, and becomes a transparent bottle after fast blow molding, cooling and forming. In the single-stage production method, the temperature is determined by the cooling time in the injection molding process, so the processing of injection and blowing should be well setted.
