Hydraulic problems of the theory of roller pressing hides.

Theoretical description of the roller pressing of fibrous materials is one of the most difficult problems in modern mechanics. The difficulty lies in the need to jointly solve two problems: the first problem is a contact interaction in two-roll modules (a contact problem); the second problem is moisture filtration in a deformable inhomogeneous porous medium (a hydraulic problem). The article deals with the main hydraulic problems of the theory of roller pressing of leather. Mathematical models were developed for the patterns of changes in the hydraulic pressure in the zone of pressing leather and in the residual moisture of the roller pressing of leather. It was found that the rate of moisture filtration along the abscissa at the boundaries of the compression (recovery) zone is zero, and takes negative (positive) values inside the zone. It was revealed that the hydraulic pressure changes from zero at the beginning and end of the roll contact zone to a maximum at a point lying on the line of centers. [ABSTRACT FROM AUTHOR]