TH9829A - Tanning process - Google Patents

Abstract

This invention involves the tanning of raw, already acidified. This process consists of (a) preparing a liquid bath. Insoluble organic matter (b) a suspension of mineral bleaches that Is a metal compound that is specifically a chromium salt or The chromium complex is contained in this tub (c) the adjustment of the leather hydrate rate is 200% higher than the minimum shift threshold (the weight of the dry leather basis) and below the maximum shift limit at Corresponding to the limit of water retention in the leather (d) the weight that has been hydrated by this method, put in An organic liquid bath with bleach for at least 4 hours and the base slowly enters the tub to gradually increase the pH of the water in the skins. Until the final value is from the start Early change to a minimum of 3.9 for chromium bleaching until To the minimum, change the maximum to 4.4 for tanning with colomium and (e) removing the skin from the tub and leaving it for at least 24 hours. The tanning bath was completely used and there was no walt-out of the bleach in the subsequent steps and obtained a good quality leather.

Claims (1)

1. The tanning process that has already acidified (Or raw leather that has been acidified) that shows the specific characteristics that The process consists of (A) Preparation of an insoluble organic liquid reservoir and, by means of chemist, average per wall and mineral bleach. (B) Suspension of a mineral bleach that is a metallic compound in a bath. Such organic liquid (C) Adjustment of the hydration rate of the movie in the range from - The minimum threshold of 200% (leather compared to dry hides weight), where all the leather fibers are saturated with water, resulting in a uniform porosity.