Industrial approbation Technological processes Filling-retanning Semi-finished chrome Tanning product Production of elastic leather Physicochemical properties For the industrial approbation of the developed biotechnologies, using the chrome tanning semi-finished product of wet-salted raw material of cattle-heavy heifer, bulls, and outgrowths thickness respectively by 1.7, 1.5 and 1.4 mm. The filling-retanning processes were carried out in a "Doze" company drum (Germany) with a volume of 0.39 м 3 at a temperature of 30-32°C, mixing with its 7-8 min-1 rotation speed and using ionized nanosilica A-300. The use of ionized nanosilica A-300 by 1 technology provides a reduction in the consumption of imported materials through the formation of increased volumetric output and adhesion in leather material, respectively, by 13% and 19-26% compared with the material obtained by the current technology. The use of the biocatalytic modifier in 2 technology make it possible to reduce the consumption of imported reagents by 38% with an increase in the elasticplastic parameters of the leather material, in particular, increase the breaking elongation to 77%. At the same time, the output area of leather material is increase and achieved by 5.1%. According to 3 technology, complete replacement of the quiberacho extract with a nanocrystalline A-300 ensures the formation of light-colored leather with a topographically more homogeneous with an output area increased by 3.7%. The complex of physico-mechanical properties of the resulting leather is dominated by industrially manufactured and meets the requirements for elastic leather for garments in accordance with DSTU 3115-95 and the international standard ISO 9001:2015 "Quality management systems. Requirements". Manufacturing on the developed technologies for the formation of chrome-tanning elastic leather materials are patented and can be considered as promising for the introduction of tanneries into the industry.
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