First of all, because beer contains organic components such as alcohol, and the plastic in plastic bottles is organic, these organic substances are harmful to the human body. According to the principles of full and accurate compatibility, these organic substances will dissolve in beer. When people drink such beer, they will also Toxic organic matter is ingested into the body, thus causing harm to the human body, so beer is not loaded with plastic bottles.
Second, ordinary window glass, oil bottles, wine bottles, etc. have a faint green color. This is the raw material for making glass, which contains the green color brought by the impurities of divalent iron ions. Some medicine bottles, beer bottles, and soy sauce bottles are brown, which is still caused by iron impurities, but it is not bivalent iron ions but trivalent iron ions. One of the important raw materials in beer is hops, which imparts a special bitter taste to the beer. The ingredients in the hops are light-sensitive and can decompose under the influence of ultraviolet rays in the sun, creating an unpleasant "sunshine smell". Colored glass bottles can To a certain extent, this reaction is reduced. However, the effect of the brown bottle is better than that of the green. There are colorless and transparent bottles of beer on the market, and the hops added in the production are processed.
Future trends
Glass bottles have the advantages of good gas barrier properties, long shelf life, good transparency, and easy recycling. However, they have problems such as high energy consumption, heavy weight, and explosion and injury. Recently, the research and development of high-barrier PET bottles with the main goal of beer packaging has become a hot spot in the industry. After long-term and extensive research work, substantial progress has been made. Beer is extremely sensitive to light and oxygen, and its shelf life is usually 120 days. It requires that the oxygen permeability of beer bottles is no greater than 1×10-6g in 120 days, and the loss of CO2 is not more than 5%. This requirement is 2 to 5 times that of pure PET bottles; in addition, some breweries use pasteurization of beer, requiring a peak temperature resistance of 298°C, whereas pure PET bottles have the strength, heat resistance, and gas barrier properties. All of them failed to meet the requirements of beer bottles. Therefore, people competed in research and development of various barriers, new materials and new technologies.
At present, the technology to replace glass bottles and metal canned beer with PET bottles has matured and the commercialization process has started. According to "Modern Plastics" magazine, in the next 3 to 10 years, 1% to 5% of the world's beer will be changed to PET bottles.
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