How the ancient Chinese leather made of ah

Answer:

Dewaxing, pickling: This process is to remove the excess in the process of removing excess alkali; in fact, is a process of acid and alkali. Add the appropriate acid, neutralize the excess alkali, to achieve the required value of tanning tanning.

Ammonia, also known as alkali expansion, refers to the addition of alkali (usually the use of Ca (OH) 2) to expand the skin to a certain thickness, conducive to layer. The first layer for the more high-end clothing, shoes, etc .; two for the lower level of leather goods, the first layer than the second floor of the price much higher

Hair removal, degreasing: the purpose of this process is to skin cells in the oil and the original skin surface hair off, exposing the natural, delicate grain. If the degreasing is not complete, the skin will appear after the dry board hard phenomenon

With salt and alum powder rubbed on the hides and rubbing, out of the inside of the oil, and then use the bamboo piece to pull the skin, hanging in a cool ventilated place to dry.

Tanning: retanning: dyeing: fat: dry: pull soft: finishing: in the manufacture of light leather process, before and after the appearance of the quality of leather products manufacturing and consumer choice has a decisive role, although the inherent quality of leather and Feel can meet the requirements, but the final coating if not beautiful or easy to fall off, will affect the use of leather products.