SU146429A1 - The method of processing leather and fur raw materials - Google Patents

Description

It is known that the skin of animals has a low permeability, and therefore the processing of leather and fur raw materials and semi-finished products in solutions of alkalis, salts, enzymes, tanning agents, fat emulsions, etc., proceed very slowly.

The permeability of the skin of animals is low due to the fact that the collagen structures are interconnected by an interfibrillar viscous substance of a colloidal nature - mukondami. The latter adsorb all materials used in the processing of the skins into the skin or fur, as a result of which the corresponding processes proceed slowly.

In order to intensify the processes of processing leather and fur raw materials, the mole and the semi-finished product, it is necessary to loosen the collagen tissue as quickly as possible and thereby increase its permeability.

The proposed method of reducing the processing time of the leather and hedge raw materials is that, prior to carrying out wet operations, the said raw materials are treated in aqueous solutions of sodium sulfite or hydrosulfite with anionic or non-ionic wetting agents added to the solution.

The said processing of leather or fur raw materials is produced in rotating drums, barges and other similarly) equipment in a solution of sodium sulfite or hydrosulfite (2-4% by weight of the raw material) with a fat ratio from 2 to 4 for 6 hours. n at a temperature of from 25 to 28 °. When 0.2% (by weight of the raw material) of the op-10 wetting agent is introduced into the treatment solution, the consumption of sodium sulfite or hydrosulfite decreases to 1 -1.5% (by weight of the raw material), the fat ratio

Ho 146429-2 -

can be significantly reduced with a processing time of three to six hours.

The leather and fur raw materials processed under the same conditions as a result of the loosening of viscous MS-fiber material acquire an increased permeability. The introduction of wetting agents into the bath accelerates the destruction of the interfibrillar substance.

As a result of the described treatment, the following processes are accelerated by a factor of 2 to 3: preservation of raw hides in salt brine; soaking leather raw materials; Zolka, and hair removal and improves absorption of tanning agents, fat and impregnating emulsions, dyes, etc.

The increase in the permeability of the leather and fur raw materials achieved in this way allows for fleshing after the process

GRAINS;

Subject invention

A method of treating leather and fur raw materials, characterized in that, in order to speed up the processing, said raw materials are pretreated before aqueous operations in aqueous solutions of sodium sulphite or hydrosulphite with anionic and non-ionic wetting agents added to the solution.