Plant Tannins Valanea Tanining Extract For Leather Tanning

Product Description

Quality indicators

Application of tannin in leather manufacturing industry:

Tanning characteristics: Tannin tanned leather has good filling and molding properties, which are difficult to replace by other tanning agents

.

Tannin types: Tannin is divided into two categories: condensation type and hydrolysis type, and their functions and effects in the tanning process are different

.

Tannin modification: Tannin can be modified by sodium sulfite modification, oxidation modification, etc. to improve its water solubility, lighten color, reduce viscosity, and enhance permeability

.

Vegetable tanned leather characteristics: Leather tanned mainly with tannin is called vegetable tanned leather. It is full and tight inside, easy to mold, and has low ductility. It is the basic method for manufacturing heavy leather such as sole leather and luggage leather

.

Combined tanning: Tannin can be used in combination with metal salts such as aluminum salts to increase the shrinkage temperature and wet heat stability of leather, reduce the amount of tannin, weaken the vegetable tanning feeling of finished leather, and improve softness and extensibility

.

Retanning application: Tannin extract retanning can give leather special properties, such as improving the fullness of finished leather, inhibiting the formation of hexavalent chromium, etc., to meet the personalized requirements of different types of leather.

Environmental protection trend: With the improvement of environmental protection requirements, tannin extract, as a green and degradable vegetable tanning agent, is increasingly valued.