Packaging In the absence of invented the bag before the use of the main bag, so that people used to be environmentally friendly and healthy packaging products, but the paper bag for daily life has a lot of shortcomings, such as air tightness is not good, waterproof Strong, no toughness and tear resistance, so the paper bag lit in the day just a simple package for the food can only use oil and other lotus leaf packaging.

The invention of plastic was a complete coincidence. In 1905, the United States chemist Bekelan in a test, the two chemicals (phenol and formaldehyde) together into the flask, and acid as a catalyst for heating. As a result, a yellow gum appeared and stuck to the inner wall of the flask, which was not washed down with water, and the harder the more heated it was! Scientists keen insight to remind the Beckland, which is likely to be a new material. So he worked hard, spent four years, find out the secret behind this plastic was born.

Plastic products and durable, it's not only to the advent of people's lives has brought a lot of convenience, but also greatly promoted the development of the industry. Shanghai Blown manufacturers to facilitate the production of bags is convenient for people's lives, and now plastic products have occupied the basic necessities of people's lives in today's materials play an irreplaceable role, although the birth of plastic is only 100 years, it's The birth of people have been ecstatic, behind it there is a huge risk --- environmental pollution, environmental advantages of the bag has become a disadvantage, and because of its physical characteristics of stability, resulting in convenient bags buried in the ground It will not degrade for centuries, and some say its invention is one of the worst inventions in human history.