About PET bottles?
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PET bottle with its superior performance, relatively low cost and adaptability to environmental protection, competition and other packaging materials (glass, tin, PE, PVC, etc.) bottles class has been developing rapidly, but its heat resistance , poor gas barrier properties, limiting him in hot filling and require high air-tightness occasions, and attracted great attention. In the process of improving and improving its performance , polyester packaging has achieved new development. One is to improve heat resistance. Ordinary PET bottles can not be used for the packaging of juices, teas and other hot-filled items . At present , three types of practical heat-resistant PET bottles have been developed through research : heat setting bottles , which can meet the requirements for 85 °C filling ; PET/PEN alloy bottles, PEN high heat resistance, in the normal injection stretch blow bottle can be obtained above 80 ℃ meet the requirements for hot filling device, then if the heat setting treatment, hot-fill temperature up to above 90 ℃; heat resistant polyarylate and the like made of multi-layer composite bottles, to improve the heat resistance.
The second is to improve gas barrier properties. Although the gas barrier property of PET is much higher than that of polyethylene, polypropylene, polystyrene, etc. , it is still unable to meet the requirements for products requiring more stringent preservation and taste protection such as beer, liquor, and perfume. There are three main methods for improving gas barrier properties . (1) multilayer composite, mainly of PET, is added to other air-tight material PVDC, EVOH, MXD6, PEN, etc. made of three layers or five layers bottle; (2) using a special processing method such as a PET bottle or epoxy barrier layer coating, or plasma treatment (ACTIS technology); (3) other barrier resin molding with PET to PEN or PEN blend or copolymer as the raw material, not only improves the bottle gas barrier properties, heat resistance is improved and the bottle, to meet the beer 3 to 6 months storage requirements; caustic may also sterilized, re-use, thereby reducing costs. Because the former two methods have problems such as poor transparency, difficulty in recycling, complicated process , and special equipment requirements , and although the airtightness is improved , the heat resistance is poor , and it can only be applied to aseptic filling. Most of the beer industry in China adopts post-fill pasteurization technology . Therefore, PEN or PET copolymers and blends are used as raw materials . The PET bottle blowing equipment and process are used for molding . It is suitable for the development of beer plastic packaging in China's national conditions. direction, relevant departments and enterprises deserves attention.
 They are used , with molded handles on the sides of these plastic cans. At an international packaging exhibition , several companies , including Schmarbacher Roebeka, showed several milk bottles made from transparent PET material , which is much better than the commonly used opaque HDPE ( high density polyethylene) material of the bottle.
