As a new type of bottle, PET bottle has a rapid development momentum. It has become a packaging form of various tea drinks in just 20 years, and now our life has been full of PET bottles. However, the success of PET bottle must have its own reason. It has high fusibility, light texture, good barrier performance and low cost, and is popular with manufacturers and consumers. These good properties make PET so widely used today. So, today we will take you to understand the current situation and characteristics of PET bottles.
Application status of PET bottle:
DuPont was the first to develop a new type of polyester bottle in 1970. In 1976, PET bottles were first used for soy sauce packaging in Japan, realizing industrial production. In 2004, the number of PET bottles rapidly expanded to nearly 250 billion and will reach 300 billion in 2006, with an average annual growth rate of 10%. At present, polyester bottles for beverage packaging in China are used for carbonated beverages and hot cans. In the beverage packaging market, carbonated beverage packaging is the most successful and widely used. The application proportion of PET bottles in domestic carbonated beverage packaging accounts for 57.4%. In addition, carbonated beverages account for 46% of the total output of soft drinks. The consumption of polyester bottles is relatively large, accounting for the main market share.
In recent years, with the sudden rise of tea drinks, hot filled PET bottles for filling tea drinks have become the fastest growing category of PET bottles, with an annual growth rate of more than 50%, and have become the second largest application field of PET bottles after carbonated drinks. As tea drinks are required to be hot filled at 85 ℃~90 ℃, the temperature resistance of PET bottles for hot filling is required to be high, generally reaching about 95 ℃.
Features of PET bottle:
Compared with other plastic packaging materials, PET is the best material for soft drink packaging. This is because PET has a high melting temperature, strength, clarity, excellent "gas barrier performance, flavor barrier performance, low cost, easy molding and recyclability, etc. However, PET bottles can not meet the special requirements of some beverages, such as wine, fruit juice and other soft drinks packaging, oxygen, carbon dioxide, water, such as hot drinks and some soft drinks.
The use of PET in beer affects the quality of these products. The barrier of oxygen, vegetable gas and flavor in the air cannot meet the packaging requirements, which will accelerate the deterioration of the beverage. Although its polymer (such as PEN) released from the carbon dioxide entering the plastic bottle and the bottle containing carbonated drinks can solve the barrier problem, the cost is too high and it is difficult to recycle. According to the barrier performance of high PET to oxygen and carbon trioxide, it has attracted extensive attention. At present, some technologies are to re stage PET and some materials with barrier performance to improve its performance.