Processing method of leather semi-finished product

Abstract

The invention relates to a processing method of a leather semi-finished product. The method comprises the steps of pre-soaking, main soaking, liming, washing, pre-deliming, deliming, softening, pickling, tanning and the like. By adjusting the processing technology and adopting proper auxiliaries, the method provided by the invention can reduce the chromium content in a chromium solution, remove barilla in lime pelt, eliminate scurf, and improve the elasticity, air permeability and smooth grain side of the leather. According to the invention, preparation is made for the tanning operation, the contraction temperature of leather can be increased, the heat / humidity resistance stability is high, and thus the leather is soft and full and has excellent corrosion resistance. The leather processing method provided by the invention uses a relatively small amount of water, generates little industrial waste water, is favorable for environmental protection, and has a relatively short technologicalperiod, low power consumption, low cost and relatively good economic benefits.

Description

technical field [0001] The invention relates to the field of leather making, in particular to a method for processing semi-finished leather products. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. The existing basic process of tanning is as follows: pre-tanning raw material hides, then chrome tanning, washing with water after wet blue leather, squeezing water, peeling, and then chrome retanning, alkali extraction and neutralization, dyeing and fatliquoring , and finally fix the color and finish the finished leather. There are following defectives in above-mentioned technology: 1. produce a large amount of chromium-containing waste---chrome leather shavings in the smoothing process, only my country just produces about 280,000 tons of chromium-containing waste every year, and the processing mode for chrome leather shavings at present is to Its landfill, this...

AI Technical Summary

Problems solved by technology

There are following defectives in above-mentioned technology: 1. produce a large amount of chromium-containing waste---chrome leather shavings in the smoothing process, only China just produces about 280,000 tons of chromium-containing waste every year, and the processing mode for chrome leather shavings at present is to Its landfill, this method not only occupies land resources, but also brings environmental pollution; 2. This process produces a large amount of industrial wastewater. content is 60-100mg / l, CODCr is 2000-3000mg / l, S2- (iodometric method) content is 100-200mg / l, BOD5 is 2200mg / l, Cl- 3000mg / l, causing serious pollution to rivers and farmland; 3. The whole process consumes a lot of water, high power consumption, long process cycle and high cost