A production process for improving the tear strength of nappa shoe upper leather

Abstract

The invention relates to the technical field of the leather making chemistry and engineering and provides a production technique for improving the tearing strength of nappa shoe upper leather. Cattle leather manufactured through the production technique for improving the tearing strength of the nappa shoe upper leather is high in tearing strength, the crust leather is light, thin and soft, and the cattle leather is plump and elastic; in addition, the production technique is easy to implement, proper in production cost and suitable for large-scale production. The technique for improving the tearing strength of the nappa shoe upper leather specifically comprises the following technological steps of conventional wringing stretching, shaving and weighing of wet blue leather, rinsing, chrome tanning, leather basifying overnight, neutralizing, retanning and dyeing, fat liquoring, displacement bathing, chrome tanning, topping, washing and standing after discharging out of a drum, and conventional after treatment.

Description

Technical field [0001] The invention relates to the field of tanning chemistry and engineering technology, in particular to a production process for improving the tear strength of nappa shoe upper leather. Background technique [0002] With the advancement of society, people’s requirements for nappa shoe upper leather are becoming more and more light, soft, plump and flexible, while nappa shoe upper leather requires thinness and softness, which is extremely important to meet The tear strength index is required, so that the stitched or glued parts of shoes made of leather are guaranteed to be no longer damaged during the wearing process. [0003] At present, the thin and soft nappa shoe upper leather is often in the drum dyeing or squeezing process due to excessive mechanical force, and there is less cross-linking between the crust leather fibers, which causes the crust leather to be torn during the production process. Or problems such as insufficient tear strength of semi-finished...

AI Technical Summary

Problems solved by technology

[0003] At present, the thin and soft nappa shoe upper leather often suffers from excessive mechanical force in the drum dyeing or squeezing process, and the cross-linking between the leather fibers is less, so that the crust leather is torn during the production process. Or insufficient tear strength of semi-finished products, etc.