The PET bottle weighs only 1/7th of the glass and does not break. It has achieved great success in the packaging of soft drinks, especially 2L to 3L bottles. In recent years, small-capacity beverages have slowly given up on the original glass or canned packaging and instead used PET bottles.
However, it is extremely difficult for beer to change from glass bottles to PET. Bottle body must have strong barrier properties to carbon dioxide and oxygen, and must have the advantages of transparency and sturdiness. The unit cost of a PET bottle is twice that of a normal glass bottle. Its air permeability is high, especially oxygen and carbon dioxide. The shelf life of beer depends on the longest time it can last, and the infiltration of oxygen directly affects the taste of the beer. In addition, the decrease in the degree of carbonation also leads to changes in the taste of beer. The current research focus of plastic bottles is on how to improve the barrier properties of plastic bottles to oxygen and carbon dioxide, and how to extend the shelf life of plastic bottled beer. Another major obstacle is the filling of beer. At present, 80% of the world's beer is sterilized by tunnel pasteurization. The temperature of this process is not always acceptable for PET bottles.
Different products and different markets require different solutions, but the products are often driven not by technology but by the market. Barrier coating technology extends shelf life and improves oxygen barrier properties, while active multilayer bottles have high processing flexibility and oxygen barrier properties, but have a shorter shelf life.
In addition, sealing is still a big issue, regardless of the oxygen barrier ability of the bottle body. For small-capacity bottles, the oxygen infiltrated from the bottle mouth has a great influence on the taste of beer. Currently available caps are metal crown caps, plastic caps, and aluminum caps. Plastic bottled beer requires a complete solution that combines the bottle body and the bottle cap. Therefore, high barrier performance caps are not required to be developed.
Judging from the current development situation, glass bottled beer will still be used for a period of time, and the future of plastic bottles is also very optimistic. With the efforts of the R&D personnel and the continuous improvement of technology, plastic bottled beer will have a good development prospect.
However, it is extremely difficult for beer to change from glass bottles to PET. Bottle body must have strong barrier properties to carbon dioxide and oxygen, and must have the advantages of transparency and sturdiness. The unit cost of a PET bottle is twice that of a normal glass bottle. Its air permeability is high, especially oxygen and carbon dioxide. The shelf life of beer depends on the longest time it can last, and the infiltration of oxygen directly affects the taste of the beer. In addition, the decrease in the degree of carbonation also leads to changes in the taste of beer. The current research focus of plastic bottles is on how to improve the barrier properties of plastic bottles to oxygen and carbon dioxide, and how to extend the shelf life of plastic bottled beer. Another major obstacle is the filling of beer. At present, 80% of the world's beer is sterilized by tunnel pasteurization. The temperature of this process is not always acceptable for PET bottles.
Different products and different markets require different solutions, but the products are often driven not by technology but by the market. Barrier coating technology extends shelf life and improves oxygen barrier properties, while active multilayer bottles have high processing flexibility and oxygen barrier properties, but have a shorter shelf life.
In addition, sealing is still a big issue, regardless of the oxygen barrier ability of the bottle body. For small-capacity bottles, the oxygen infiltrated from the bottle mouth has a great influence on the taste of beer. Currently available caps are metal crown caps, plastic caps, and aluminum caps. Plastic bottled beer requires a complete solution that combines the bottle body and the bottle cap. Therefore, high barrier performance caps are not required to be developed.
Judging from the current development situation, glass bottled beer will still be used for a period of time, and the future of plastic bottles is also very optimistic. With the efforts of the R&D personnel and the continuous improvement of technology, plastic bottled beer will have a good development prospect.
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