Modeling of the roller pressing of fibrous materials

Abstract

The work is devoted to modeling the regularities of hydraulic pressure distribution and fluid removal from the fibrous material in the contact zone. It was found that the hydraulic pressure in the compression zone increases from zero at the initial point of contact to a maximum at the point of maximum compression of the fibrous material. The patterns of distribution of hydraulic pressure in the recovery zone depend on the length of the section, where the fluid moves from the layer of material to the elastic coatings. It was revealed that the amount of liquid removed at the beginning of the compression zone grows faster, then the growth rate is much lower, and at the end of the compression zone, the removed liquid is stabilized. The patterns of change in the removed fluid in the recovery zone depend on the angle, which determines the position of the point where the fluid changes direction.

Study on issues of hydrodynamics of the roll squeezing process

“…An analysis of the calculated data and curves of hydraulic pressure distribution described by models (11) and (12) showed that they fully correspond to the theoretical conclusions and experimental diagrams of hydraulic pressure given in [5,13,23]. As is known [4,5], the amount of removed fluid flowing along the roll contact curve can be determined by the following expression:…”

Study on contact lines of rolls of two-roll modules

“…Solutions to the problems of contact interaction in roller machines, where the work rolls have an elastic coating, depend on how fully it represents the laws of deformation of the contacting bodies [4,5]. An analysis of the experimental data [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] has shown that, in general, the deformation of such contacting bodies of roller machines is described either by empirical formulas of the form n A   , or by rheological models of the form…”

Study on hydraulic pressures in the roll squeezing process

“…Among these processes, the process of pressing the semi-finished leather product after tanning is of particular importance, since this process creates the moisture necessary for subsequent technological processes. Despite numerous studies of the problem of contact interaction and moisture filtration during squeezing, mathematical modeling of the distribution of hydraulic pressures in the process of squeezing the skin is poorly understood [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The fact that the filtering properties of the semi-finished leather product after tanning are not used in solving hydraulic problems indicates that the hydraulic problems in the roller pressing of the skin are poorly understood.…”