3 Animals That Start With Z Other Than Zebra The Process of Chromium Tanning for a Cow Hide Rug

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The Process of Chromium Tanning for a Cow Hide Rug

Cowhide rugs and cowhide rugs are increasingly popular materials in both the fashion and home leisure sectors and are popular for their hard wearing, natural look and stylish appearance. These natural products have been used by humans since ancient times from the time when humans first killed animals for food and removed the pelt to make clothing and materials for shelter.

Over the years many methods were discovered to make the skin more usable and last longer than raw hide, first of all tanning the skin which ensures that the skin will not decompose by changing the protein structure of the skin body completely. This process requires acidification of the skin and it is interesting to note that the Romans used human urine in the process and archaeological evidence has been found in Pompeii of urine collected from public toilets for this purpose. only.

There are mainly two types of tanning processes, vegetable tanning and the modern chromium tanning which was first used commercially in 1856. The chromium tanning process produces tender and superior beef quality. By being tanned with chromium salts the animal hide has a softer result and a more uniform texture.

This tanning method has the following steps:

1) Wet hide

Raw cowhide is washed thoroughly before tanning where dirt, manure, blood, and certain treatment materials are initially applied such as sodium chloride and bactericides from the skin.

2) Pickling the Hide

Increased absorption increases the acidity of the skin to pH 3 which allows chromium tanning salts to penetrate the skin. Salts are also added to the pickling solution to prevent the skin from swelling too much. This ensures that the preserve will last a long time and to help this can be treated by adding to 2% by weight of fungicides and bactericides.

3) Tanning: Chrome tanning

After drying, which can last for several days, the pH of the solution will gradually decrease in acidity which is when chromium salts are added to the mixture. To fix chromium into the skin, the pH is slowly improved by the addition of a basic chemical which allows the cross-linking of chromium ions with the free carboxyl groups in the collagen protein of the skin. This repair process ensures that the storage will be resistant to bacteria and high temperature. Once finished the chromium-tanned storage will contain approximately 2-3% by dry weight of Cr3+.

4) Foundation

Chrome salts are treated with magnesium oxide and antifungal to ensure that the storage does not rot or become moldy.

5) This penultimate step is done mechanically to ensure that the finished beef stock has the right thickness – this includes squeezing, dividing and then finally shrinking.

6) Finally the deposit is impregnated with formiato-bicarbonate of sodium and synthetic oils which make the final product soft and subtle and soft to the touch.

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