China Pet Bottle Cater To Market Development

Usually, the PET resin starts to soften at 70 ° C or higher. This softening temperature is called TG (grass transition temperature) of PET. It is assumed that when the Pet Preform leaves in the atmosphere above 70 ° C, the bottle neck will begin to soften, and almost the size will shrink, and the bottle mouth will also be deformed.

In particular, the demand for beverages such as juice, oolong tea, coffee drinks and lactic acid beverages is expanding in recent years. However, almost all beverages are filled into PET bottles at temperatures above 85 ° C. After that, the PET bottles are placed on the filling line, then the bottles are inverted and the contents of the bottle are filled with high temperature contents. Disinfect for a period of time.

Therefore, the mouth of a PET bottle must be able to withstand high temperatures. Usually, the state of the neck finish of the PET preform is amorphous because it is injection molded, which is why it is not heat resistant above 70 °C. In other words, the finish has dimensional shrinkage and shape distortion during hot filling and can cause fatal defects in the PET bottle, such as microleakage.

However, PET has a property of becoming heat-resistant upon crystallization. The density of amorphous PET is 1.365 g / cm3, but heat resistance is not considered. When the crystallinity is increased from 1.365 to 1.380 (the crystallinity index is increased from 25% to 39%), the density is higher.

As a professional China Pet Bottle manufacturer, Jilian Mould has gained many customers’ trust and praise in the market with years of experience. We have seen the development trend of this industry and are determined to bring you more products that suit your own wishes.

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