Rubberized Leather Tanning for Uniform Elastic Properties

The patent applies different treatment conditions to different stages of the tanning process. Specifically, the rubberizing treatment is applied during the wet phase with controlled elastomer concentration (0.1-5% of leather weight), followed by a distinct drying phase where water is removed to below 100% humidity. This staged approach ensures uniform penetration of elastomers throughout the leather matrix while maintaining consistent physical and mechanical properties across the final product.

The patent controls critical parameters including elastomer concentration (0.1-5% of leather weight), humidity levels (maintaining wet phase conditions during treatment, then reducing to below 100% during drying), and treatment duration (15-60 minutes). These parameter controls ensure homogeneous distribution of elastomers and consistent mechanical properties throughout the leather thickness.

The patent performs preliminary actions during the wet phase treatment by ensuring uniform elastomer penetration and distribution before the drying process begins. The leather is thoroughly impregnated with elastomers while in the wet state, creating a homogeneous structure that resists wrinkling during subsequent drying. This preliminary uniform impregnation allows for faster drying without quality defects.

The patent maintains continuous control over the drying process by monitoring humidity levels and ensuring they remain below 100% throughout drying. This continuous control prevents sudden moisture loss that could cause wrinkling, while still maintaining efficient drying rates through optimized process conditions and equipment.