Paper pulp (pulp) is a fibrous material made from plant fibers by different processing methods. According to the processing method, it can be divided into mechanical pulp, chemical pulp and chemical mechanical pulp. It can also be divided into wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp, rag pulp and so on. According to different purity, it can be divided into refined pulp, bleached pulp, unbleached pulp, high yield pulp, semi-chemical pulp, etc. Usually used to make paper and cardboard. In addition to making special paper, refined pulp is often used as raw material for cellulose esters, cellulose ethers and other cellulose derivatives. It is also used in the fields of man-made fibers, plastics, coatings, films, gunpowder and so on.