Preparation of papermaking machine equipment
Date:2018-03-03 Author: Click:
Paper making machinery includes preparation of raw materials, pulping, paper making, and mechanical processing of paper and paperboard. It is the equipment for pre-processing and processing of papermaking raw materials before cooking or pulping. It is divided into non-wood fiber stock equipment and wood fiber spare equipment. The former has the cutting machine, the cutting reed machine and the sugarcane dividing machine, the latter has the peeling machine, the cutting machine and so on. The sharpening machine is the machine that will produce the log of wood pulp which is needed to produce wood pulp, which is divided into two types: disc type and drum type. The digester is the equipment to dissolve the lignin in papermaking raw materials and make the paper raw material to be separated into the fiber, which is divided into two types: intermittent and continuous. The mill is the equipment that produces grind wood pulp, according to the production way can be divided into intermittent type and continuous type two kinds, according to the pressing way of log, can be divided into hydraulic pressure type and mechanical pressure type two kinds;
Pulping equipment is the equipment used to separate plant material into fiber. Pulping method can be divided into chemical, mechanical and chemical mechanical method, the corresponding pulping equipment including wood digester, grinding machine, hot mill, pulp washing machine, the bleaching pulp machine, beater, and waste recycling equipment, etc. Wood slice after steam preheating, and then in a state of pulp mill solution called high pressure hot wood pulp, make wood pulp grinding machine is hot mill, hot mill power consumption is very big, so make full use of the heat energy in the process of pulping is the key problems of hot mill; The pulp washing machine is the mechanical equipment which separates the pulping and the black liquor from the boiling, and the extraction rate of black liquor is divided into two categories: high concentration and low concentration.
The purpose of pulp bleaching is to remove the lignin and pigment remaining in the pulp after cooking, to improve the whiteness of the pulp and to make the pulp white. The bleaching machine is a kind of bleaching equipment which is widely used. It is composed of screw propeller, drum washing and so on. The slurry and bleach are placed in the pool and continuously added to the washing water. The process of mixing and chemical reactions is completed by the circulation of the propellers in the pool. The water with bleaching products and residual bleach is discharged through the inner cavity of the drum to make white pulp.
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