A method for producing shrinkage leather from wet blue cowhide

Abstract

The invention discloses a method for producing shrunk grain leather from wet blue leather. The method comprises the following steps: performing dechroming treatment on wet blue (cattle) leather, and removing toxic Cr <6+>, so that the product can be prepared into a non-toxic and environment-friendly product; softening the leather blank through an alkaline enzyme, so that the leather fiber is properly loosened and softened, and the leather blank is soft and comfortable; shrinking the grain in two steps, to be specific, shrinking the grain by using an aldehyde, and then shrinking the grain by a non-toxic and ecological vegetable tanning agent, so that the grain shrinking effect is enhanced; filling multiple materials, so that the leather grains are full and raised; enabling the leather surface to present uniform and regular grains through the mechanical action. The shrunk grain leather produced by the method is particularly suitable for manufacturing high-grade chrome-free furniture leather, sofa leather and package leather, and a novel way is provided for recycling the wet blue leather.

Description

technical field [0001] The invention belongs to the technical field of tanning technology, and in particular relates to a method for producing shrinkage leather from wet blue cowhide. Background technique [0002] At present, China has become a world-recognized leather production and trading power. However, my country's cowhide resources are limited, and leather companies need to import a large amount of cowhide from Africa and other places every year. Due to factors such as transportation costs and sanitation and epidemic prevention, the imported cowhide is not raw leather, but wet blue cowhide after preliminary processing. This kind of wet blue cowhide is generally used to produce ordinary shoe upper leather and so on. [0003] Shrunk leather is leather treated with strong astringent tanning agents (such as aldehyde or tannin extract, etc.). The leather surface shrinks regularly, highlighting the three-dimensional texture of the skin. Do high-grade furniture leather, so...

AI Technical Summary

Problems solved by technology

[0006] 1. Due to the insufficient pre-tanning treatment of wet blue cowhide, the leather blank is hard, and the performance of the finished leather cannot meet the requirements of softness and comfort.

[0007] 2. Cowhide fiber is thicker than sheepskin fiber, and it is more difficult for the leather surface to shrink regularly

[0009] The existing method of processing shrinkage leather with sheepskin and goatskin is different from the processing method of cowhide, and cannot be used for cowhide processing