are two types of tanning, vegetable tanning and chromium tanning ,
chromium tanning produce a softer and better quality cowhides.These
cowhides are tanned with chrome, which provides them a soft and uniform
and treatment to the cow hides rugs
This process consists of the following steps:
The preserved raw hides regain their normal water contents. Dirt,
manure, blood, preservatives (sodium chloride, bactericides) etc.
Pickling increases the acidity of the hide to a pH of 3, enabling
chromium tannins to enter the hide. Salts are added to prevent the
hide from swelling. For preservation purposes, 0.03 - 2 weight percent
of fungicides and bactericides are applied.
3) Tanning: Chrome tanning:
After pickling, when the pH is low, chromium salts (Cr3+) are added.
To fixate the chromium, the pH is slowly increased through addition
of a base. The process of chromium tanning is based on the cross-linkage
of chromium ions with free carboxyl groups in the collagen. It makes
the hide resistant to bacteria and high temperature. The chromium-tanned
hide contains about 2-3 dry weight percent of Cr3+.
of the chrome with oxide of magnesium and fungicide’s addition
The next step it to realize the mechanical operations necessary to
give them the needed thickness (Squeezed, divided and reduced)
Finally, the leather neutralizes each other with formiato-bicarbonate
of sodium to be able to lubricate (synthetic oils) to give them the
softness and the needed touch.
- Natural cowhide
- Printed cowhide
- Dyed cowhide -
cowhides - Cowhide
& Cleaning - Tanning
process - Links-
Quotation - Contact
Copyright © ExpoFerGus 2005-2011. All