Glass is an ancient packaging material that began with the creation of glass containers by the Egyptians, more than 3,000 years ago. It has the characteristics of high barrier, bright and transparent, good chemical stability and easy forming. The dosage accounts for about 10% of the total packaging materials. This article will introduce you to the classification standard of food packaging materials.
The metal materials used in current food packaging include iron, aluminum, stainless steel, and the like. The packaging material can use metal, because the metal has better ductility and is more convenient to process. The outer packaging formed by the metal has better protection for the internal food, and the metal is easy to be packaged and thus can be promoted.
However, metal is good for paper, glass and ceramics, but the price is relatively high and the packaging cost is not cheap. Moreover, the chemical nature of the metal is relatively active, it is oxidized and eroded in the air, and it is easy to chemically react with foods containing strong acidity and alkalinity, thereby causing pollution to food. Therefore, at present, although metals can be widely used and have an important position, their use is limited, and they are generally used for canned packaging.
The person in charge of a waste recycling station said that different types of garbage will be distributed to various places, and cartons and cartons can be reprocessed. From the current domestic conversion rate, about 100 kg of waste paper can be converted into 80 kg new. paper. However, the bags are not easy to handle, because most of the bags are covered with tape, which is somewhat difficult to recycle. The plastic bags used for express delivery are often complex in composition and contain industrial waste. They cannot be reprocessed or degraded, and most of them are used for landfill. At present, the plastic courier bag made of polyethylene material is used more, which has the characteristics of low cost, convenient use and good waterproof performance. In addition to the use of customized courier bags by major courier companies, there is now the online shopping industry, many merchants in order to give customers a good image, as well as enhance the image, and play a promotional role, but also customize their own express delivery bag.
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