Talking about the Misunderstanding of Packaging Use

Since the birth of plastic packaging bags, they have been loved by people for their lightness, low cost, and high strength. People have become accustomed to packing things in plastic bags. There are many types of plastic packaging bags on the market, but there are countless types in terms of color. So what kind of bag is good? Will we really choose plastic packaging bags? Although we can almost use plastic packaging bags every day, we often get into misunderstandings about the choice of plastic packaging bags. (1) The thicker and stronger the plastic packaging bag, the better. We often see all kinds of plastic packaging bags in our lives, so sturdy packaging bags must be good. This is not the case. Plastic packaging bags have strict standards, especially plastic bags used for food packaging. They must be produced by regular manufacturers and qualified products approved by relevant departments. The quality of these plastic bags Guaranteed. Plastic bags for food must be marked with the words 'for food'. Facing the light, you can see whether the plastic is clean. Qualified plastic bags are very clean and free of impurities, while inferior plastic bags will have dirty spots and impurities. The thickness of one side of the plastic bag must be more than 0.025mm. If it does not reach this thickness, the country prohibits production and use. (2) The plastic packaging is colorful, and the colorful packaging is more beautiful. Although there are many kinds of colors in plastic packaging bags, we must be careful when choosing them. If plastic packaging is used for edible items, considering the color alone, we must choose simple colors so that at least it has fewer additives. Many dark-colored plastic packaging bags are often produced from recycled waste materials, and these plastic bags cannot directly contact food. (3) Plastic packaging bags are reused. Many households have the habit of storing waste plastic packaging bags. In fact, it is ok to store them neatly and use waste plastic bags, but do not use waste plastic bags for contact with food and skin, as it will harm our health. Cause chronic damage. Heat shrinkable film manufacturers POF environmental protection heat shrinkable film development trend! , What is the principle of shrinkage caused by heat shrink film heating?