Technology and evaluation of the quality of the performance of dyeing and fat processes in the production of leathers from cattle hides

The article considers the issues of technology development and evaluation of the quality of the dye - fat processes in the manufacture of leathers from cattle hides. The well - known technological schemes for performing liquid finishing operations of semi - finished leather products are analyzed. A rational technology of dyeing and fat processes in the manufacture of elastic leathers for the upper of shoes has been selected and worked out in production conditions. A comprehensive assessment of the quality of the dyeing processes was carried out according to a set of qualitative and quantitative indicators and the influence of dyeing and fat processes on the change in the physical and mechanical properties of semifinished leather products was investigated. It is found out that the tested technology ensures the production of a semi - finished leather of high quality, with a deep, durable, uniform and resistant to chemical and physical - and - mechanical effects of coloring. The semi - finished product obtained during technological processing according to the complex of mechanical properties meets the requirements of regulatory and technical documentation. Recommendations have been developed to optimize the technology of dyeing and fat finishing processes of semi - finished leather products. The industrial use of the proven technology will allow the production of leather materials of a given quality level and increase production efficiency.