Pulp is a fibrous material obtained from plant fibers by different processing methods. It can be divided into mechanical pulp, chemical pulp and chemical mechanical pulp according to the processing method; it can also be divided into wood pulp, straw pulp, hemp pulp, reed pulp, sugarcane pulp, bamboo pulp, rag pulp and so on according to the fiber raw materials used. It can also be divided into refined pulp, bleached pulp, unbleached pulp, high-yield pulp, and semi-chemical pulp according to different purities. Generally used in the manufacture of paper and cardboard. Refined pulp is not only used to manufacture specialty paper, but also often used as a raw material for the manufacture of cellulose derivatives such as cellulose esters and cellulose ethers. Also used in man-made fibers, plastics, coatings, films, gunpowder and other fields.
Traditional pulping refers to the production process of dissociating plant fiber raw materials into natural or bleached pulp by chemical methods, mechanical methods or a combination of the two methods. The commonly used process is pulverizing, cooking, washing, screening, bleaching, purifying and drying the plant fiber raw materials. A new biological pulping method has been developed in modern times. First, special bacteria (white rot, brown rot, soft rot) are used to specifically decompose the lignin structure, and then mechanical or chemical methods are used to dissociate the remaining cellulose. , followed by bleaching. In this process, the organisms have decomposed and opened most of the lignin, and the chemical method is only used as an auxiliary function. Compared with the traditional method, the chemical products used are less, so less or no waste liquid can be discharged. It is an environmentally friendly pulping method. , Clean pulping method.
Post time: Sep-03-2022