Coated white board pulping process low in energy consumption

Abstract

The invention belongs to the technical field of coated white board pulping methods. A coated white board pulping process low in energy consumption is in separated and segmented pulping mode and comprises surface pulp pulping, lining pulp pulping, core pulp pulping and bottom pulp pulping. Bottom pulp and core pulp respectively undergo intermediate-concentration continuous disintegration, and the concentration is 4-5%; lining pulp undergoes high-concentration disintegration, and the concentration is 13-18%; when the beating degree of surface pulp reaches or exceeds 45 degree SR at any production stage, knife-adding pulping is not performed, and pulp is only defibered to pass through a production line; and when the beating degree of the lining pulp, the beating degree of the core pulp and the beating degree of the bottom pulp reach 35 degree SR at any production stage, knife-adding pulping is not performed, and the pulp is only defibered to pass through the production line. A mode completely different from the tradition is adopted in the coated white board pulping process, corresponding adjustment is performed on several key control indexes, and not only is energy consumption reduced, but also follow-up papermaking quality is improved.

Description

technical field [0001] The invention belongs to the technical field of slurry preparation technology for coating white paperboard. Background technique [0002] Waste paper production-oriented papermaking enterprises all need thermal dispersion system to process the slurry to improve the quality of the finished paper. The kneading heat dispersing system uses a combination of oblique screw and pressing screw to concentrate the pulp, which is the mainstream configuration of domestic papermaking enterprises. It requires a pulp concentration of 3.5 to 4.5%, and it can reach more than 28% after concentration. The initial effect of the device is not bad. However, after several years of operation, the pulp concentration can only be maintained at 16-18%. The main reason is that the screw used for thickening and the screen drum for dehydration are worn out, resulting in a larger gap between the screw and the screen drum, which is harmful to the slurry. The effect of extrusion and c...

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