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Paper pulp is based on plant fiber as raw material, processed by different methods of fibrous material. According to processing methods can be divided into mechanical pulp, chemical pulp and chemical mechanical pulp; can also be divided into wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp, rags, etc. according to the fiber materials used. According to different purity can be divided into refined pulp, bleached pulp, unbleached pulp, high yield pulp, semi-chemical pulp. More commonly used in the manufacture of paper and cardboard. In addition to the use of refined pulp for the manufacture of specialty papers, it is often used as a raw material for the production of cellulose derivatives such as cellulose esters and cellulose ethers. Also used in man-made fibers, plastics, coatings, film, gunpowder and other fields.
Traditional pulp refers to the use of chemical methods, mechanical methods or a combination of both methods, the plant fiber raw material into a bleached or bleached pulp production process. The commonly used process is to pulverize plant fiber raw materials, cooking, washing, screening, bleaching, purification, drying. Modern development of a biological pulp method, the first special strains (white rot fungi, brown rot fungi, soft rot fungus) specifically directed decomposition of lignin structure, supplemented by mechanical or chemical methods to dissociate the remaining cellulose , Followed by bleaching. In this process, the organism has been decomposed and most of the lignin is opened. The chemical method is just an auxiliary effect. The chemical products used are very few compared with the traditional methods, so the waste can be discharged with little or no discharge. , Clean the pulp method.