Abstract—An experimental study was carried out to substantiate the simultaneous removal of excess moisture from two layers of wet leather semi-finished products. For the experiment, a multilayer package was compiled, consisting of two layers of wet leather semi-finished products and two layers of permeable cloth, laid between them. The selection of samples of semi-finished leather products for the experiment were selected from chrome-plated bovine hide of medium weight, double. The excess moisture content from the wet leather semi-finished products was squeezed out by means of a vertical chain transmission on the base plate under pressure between the rotating shafts. The working shafts are covered with a permeable cloth. The experiment used the second-order D-optimal planning method. On the basis of the obtained experimental results, mathematical equations were obtained expressing the amount of moisture removed from the first and second layers of leather semi-finished products, depending on different feed rates and clamping forces of the working shafts. The main parameters of the technological process of two-layer processing of wet leather semi-finished products with their vertical feeding on the base plate between the shafts are experimentally substantiated. The parameters of the feed rate, the pressing force of the working shafts and the values of the residual moisture of the processed wet leather semi-finished products have been determined. In the future, the results obtained will serve to determine the maximum (permissible) number of layers of wet capillary-porous materials during their simultaneous processing, taking into account the provision of the necessary residual moisture in each of them.