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Due to the safety and economy of PET bottles produced by injection molding machines, they have been widely used today when fruit juice beverages and tea beverages have become mainstream beverage products.
1. The special quality requirements of the hot filling process for PET bottles
The heat resistance of the bottle is better. It is necessary to overcome the influence of hot liquid (high temperature) on the shape of the bottle: high temperature makes the bottle soft, and high temperature and hot liquid cause high pressure in the bottle. It is better to control the volume shrinkage rate between 1% and 1.5% at high temperature (85℃～90℃).
The bottle must be able to withstand negative pressure. It is necessary to overcome the negative pressure generated in the bottle after the liquid is cooled; the bottle wall shrinks (the side wall of the bottle is deformed when the negative pressure contracts, etc.).
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