How to make leather shoes? Chemical surface treatment?
This process is to remove the excess alkali in the liming process; in fact, it is a neutralization process. Add the appropriate acid and neutralize the excess alkali to achieve the pH required for tanning.
General head layer for high-end clothing, shoes, etc.; two for lower grade leather goods, the first layer is two layers, the price is much higher
Liming, also known as alkali expansion, refers to the addition of alkali (usually using Ca (OH) 2) to expand the skin to a certain thickness, which is beneficial to the formation of layers.
The purpose of this process is to remove the grease and the hair on the surface of the skin, exposing the natural and delicate particles. If the degreasing is not complete, the skin will appear stiff after drying
With salt and alum powder rub and rub in the skin, then put out the grease inside the skin, opened with bamboo, hanging in a cool ventilated place to dry.
