Beer bottles are made of different materials in different cans. Let's take a quick look at it:
1. Glass bottle: In order to maintain the quality of beer and reduce the influence of ultraviolet light, glass bottles of brown or dark green are generally used. The empty glass bottle is soaked in a dip tank (2 to 5% sputum, 40 to 70 ° C), then washed by a bottle washer, and then poured into the beer through a filling machine, and the capping machine presses the bottle cap. After pasteurization by the sterilizer, it can be packed and shipped after inspection.
2. PET (polyethylene terephthalate) plastic bottle: since the market was launched in 1980, the number has increased year by year. The advantage is that it is highly transparent, light in weight, and can be sealed again after unsealing, and the price is relatively reasonable. However, the disadvantage is that the gas retention is poor, and carbon dioxide is gradually reduced during storage. Adding a coating improves air retention, but storage time cannot be too long. PET bottles cannot be pre-emptied or pasteurized, and special filling procedures are required to avoid ingestion of air and contaminated bacteria.
3. Barrel: The barrel is made of aluminum or stainless steel and has a capacity of 15, 20, 25, 30, 50L. Among them, 30L is a common specification. Barreled beer is generally a fresh beer that has not been pasteurized. Fresh beer tastes good and costs are low, but the shelf life is not long.
4. Canned: Canned beer began in the United States in 1935. In the Second World War, it developed rapidly due to military needs. After the war, after a series of technological transformations, the demand has gradually increased. The tank material is aluminum or copper. Canned beer is light in weight, easy to carry and open for drinking, so it is very popular among consumers and develops rapidly.
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