PEN is a polyester polymer compound in which a benzene ring in PET is replaced with a naphthalene ring. The naphthalene ring has greater rigidity than the benzene ring. Therefore, PEN has higher heat resistance and mechanical properties than PET, more excellent gas barrier properties, better chemical stability, and reliable hygienic safety. At present, its products have been approved by the US PDA for direct contact with food. In addition, PEN has almost the same processability as PET, so PEN bottles can be produced using existing PET bottle equipment. PEN bottles can be directly used in high-temperature beer cans above 80 degrees Celsius without multi-layer compounding or surface coating treatment without heat setting treatment. The shelf life can reach 6 months. PEN has become a new material closely watched by the international beer industry in recent years. At present, there are countries in the world that have produced goods. They are the United States, Denmark, Norway, Germany, and Brazil. Carlsberg, Denmark, started using PEN beer bottles in 1999. It has a capacity of 380ml and a weight of 36g. Its exterior design is the same as that of the original 330ml beer, but its capacity is more than 50ml. At present, 25 million beer bottles have been used to hold beer. Accounted for 10% of the market. In 2001, PEN beer bottles were used in Norway. The dosage was about 5 million, and each weight was 7.25L. The weight was 83g. It was mainly used to replace 0.7L glass bottles and 1.5L disposable PET bottles. Recently, BP, KOSA and PPG have jointly developed a new type of polyester beer bottle that can be sterilized and can preserve the fresh taste of beer. KOSA develops PEN resin (Kosa-2202) that is resistant to high temperatures, and BP develops Amosorb, which is an oxygen absorbing agent. After the two are mixed, the bottle is molded by the injection stretch blow molding machine. The outer layer of the bottle is coated with a layer of PPG. The chemical company can prevent carbon dioxide from seeping. The leaked paint, Bairocade, can be used to make pasteurized beer bottles with a shelf life of 110 days. PEN bottles are used for excellent beer packaging performance and are attractive new varieties of beer packaging upgrades. However, it is also necessary to see that the current PEN price is expensive. Therefore, it is extremely difficult to widely promote and apply. Currently, it is limited to popular brand beer companies. Or, high-quality, new-type brewers with high performance requirements for packaging bottles are more concerned. The dressed beer is mainly for the pursuit of fashionable, personalized restaurants, entertainment venues, home travel, ball games or economically more affordable consumers. Its large-scale production and marketization process has yet to be substantially reduced by the cost of PEN.
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