Leather processing method, leather and leather product

Abstract

The invention discloses a leather processing method. The leather processing method comprises the following steps of wet blue leather wringing, shaving and weighing, rewetting, neutralizing, filling and dyeing, grain surface filling, first dry finishing, crack resin brushing, second dry finishing, water returning, greasing and post finishing. The grain surface filling process comprises the following steps of adding 50-100% of water at 35-45 DEG C and 0.5-2.5% of a multi-metal complex into a drum, and rotating for 10-30 minutes; adding 2-6% of plant tannin extract and 1-3% of maleic anhydride polymer, and rotating for 30-60 minutes; and finally, adding 0.5-1.5% of formic acid, rotating for 20-40 minutes, regulating the pH value of a bath lotion to 3.6-3.8, discharging the liquid, and washingwith water. The leather is soft and light in hand feeling, the leather body is soft, full and elastic, leather surface cracks are natural, rough, full and protruding, the stereoscopic impression is strong, visible breakage and defects are obviously reduced, the leather yield is high, and the utilization rate is high.

Description

technical field [0001] The invention relates to the technical fields of tanning chemistry and tanning engineering, in particular to a leather processing method, leather and leather products. Background technique [0002] The raw leather is treated with alkali, acid, enzyme, etc. to remove hair, non-collagen fibers and other useless things for tanning, and then tanned with basic chromium salt to obtain a lake-blue product in process, which is called wet blue leather. Wet blue leather generally has disabilities and defects, which are brought about by the raw leather itself, because animals will inevitably produce horsefly bites, abrasions, ringworm, branding, lying wounds, puncture scratches, blood tendons, etc. during the growth period. A series of disabilities and defects. The existence of these disabilities and defects will affect the appearance and utilization rate of leather, reduce the grade of leather, and reduce the utilization rate of leather. In particular, low-grad...

AI Technical Summary

Problems solved by technology

[0003] By providing a leather processing method, the present invention solves the problem of many disabilities and large defects in the low-grade wet-blue leather in the prior art, and realizes the effect of producing natural and uniform cracks on the grain surface of the leather