ФОРМУВАННЯ ЕЛАСТИЧНОЇ ШКІРИ ДЛЯ ВЗУТТЯ

Abstract

Purpose. Improving the elasticity of leather for shoe uppers through the use of hydrolytic enzymes in the retanning and filling processes.

Methodology. The study employed the asymmetric fringe method to assemble experimental batches of samples, which were then subjected to enzymatic treatment under controlled temperature conditions. The effectiveness of creating an elastic structure was evaluated through the analysis of elastic-plastic properties, chemical, physical and mechanical indicators.

Findings. The effect of enzyme dosage on the elastic-plastic properties of leather materials was investigated, as were their physical and mechanical properties. It was found that a mixture of hydrolytic enzymes at an optimal dosage of 0.2% of the semi-finished product's mass was most effective in increasing its elasticity. Using the experimental technology enables the production of elastic leather with 33–47% lower stiffness and 5.3% higher yield than standard technology. There was also an increase in the yield of finished leather area by 5.1–6.7%, with a simultaneous reduction in chemical reagent consumption by 27.0%.

Originality. The nature of the dependence of the elastic-plastic and physical-mechanical properties of leather materials on the type and concentration of enzymes used to treat them has been established. The synergistic effect of using a mixture of hydrolytic enzymes at the liquid finishing stage to plasticize the dermis structure has been demonstrated.

Practical value. A resource-saving technology has been developed for producing elastic leather materials for shoe uppers. The results obtained can be used to develop new technologies for producing a wide range of leathers.