in the preparation stage, its main purpose is to remove all useless animal skin, such as hair, fat, skin in the glands and soluble protein, and animal skin collagen fibers (which is the subject of leather processing, in order to facilitate) behind the processing and improve the quality of leather.
According to tradition, the tanning process generally divided into three stages: preparation stage, tanning stage and finishing stage.
Different kinds of leather are made of different animal skins and different processing methods
Leather is made of animal skin through very complex physical (Mechanical) processing and chemical treatment.
in the tanning stage, the main objective is to change the collagen fiber of the animal skin by chemical method, so that it can be changed from leather to leather.
