As a new generation of environmentally friendly materials, non-woven fabrics are widely used in filtration, thermal insulation and construction. The raw material of non-woven fabrics is polypropylene, while the raw material of plastic bags is polyethylene. Although the names of the two substances are similar, they are very different in chemical structure. Although it is cloth, it is not a cloth product in the traditional sense. It is a new generation of environmentally friendly materials.