The article defines the parameters of the contact lines of the rolls. Calculation formulas are found for determining such parameters as the ratio of strain rates in roll pairs when the deformation of the semi-finished leather product and the coating of are given by rheological models. It was revealed that the forms of contact lines in roll pairs do not depend on the methods of specifying the deformation of the leather material and the coating of the rolls.
The work is devoted to the optimization of the parameters of leather pressing machines. Regression models of the residual moisture content of leather and the intensity of the pressing process are developed. which depend on the intensity of the load. the radius and the speed of the rollers. A number of patterns were established that allow increasing the efficiency of leather pressing by rollers. An extremum problem was solved to determine the diameter of the rollers that provide the minimum deflection of their working part. the content of residual moisture required during the pressing process and the minimum power required to conduct the pressing process.
The influence of factors on the width of the roller contact and the specific pressure under roller pressing of leather is analyzed in the article. As a result of experimental studies, the dependences of the width of the contact area and specific pressure on the intensity of the load, velocity, and diameter of the rollers were determined. It was revealed that the parameter of the technological specific pressure on the hide in the contact zone increases with an increase in the intensity of the load, the speed of rolls, the width of the contact area, and a decrease in the radius of rolls. An analytical dependence of the residual moisture content of leather on the specific pressure was determined. It was established that with an increase in specific pressure, the residual moisture content of leather decreases and asymptotically approaches a certain value of the function.
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