CURRENT STATE AND PROSPECTS FOR IMPROVING THE PROCESS OF MILLING FIBROUS SEMI-FINISHED HIGH CONCENTRATION PROCESSES (REVIEW)

There is presented a review of scientific literature characterizing the main directions of modern research of the process of grinding of fibrous semi-finished products of high consistence. Theoretical approaches are described in the study of qualitative parameters of pulp during its processing in knife grinding machines. Researchers note an increase in the paper-forming properties of the pulp and the physical and mechanical characteristics of the finished product. This paper provides an overview of experimental studies of the high consistence pulp milling process. The effect of high consistence mass grinding intensity on the quality of the finished product is considered, the nature of fiber development when grinding high and low consistence mass is compared. Experimental studies show that an increase in the intensity of exposure when grinding a high consistence mass leads to a decrease in the tensile energy absorption index, and a decrease in the deformation of the paper sheet is also observed with an increase in the grinding intensity. With an increase in the pulp c consistence, a change in the degree of delamination, internal and external fibrillation of the fiber wall is observed. The high-consistence pulp milling process is accompanied by higher specific energy consumption compared to low- consistence pulp milling, but observations at the fiber wall level show a more developed external specific surface area. This review of the scientific literature will serve as a basis for further research on the grinding of high consistence fibrous materials.