SU21644A1 - The method of obtaining leather flour - Google Patents

Description

The usual method of crushing leather throws, consisting of crushing them between rollers, subsequent grinding and sieving, is too inefficient and requires a large amount of energy per unit of product to be processed. The proposed method consists in treating the skin scraps before passing them through rollers with a solution of natural or artificial resins in organic solvents.

To obtain leather flour, leather scraps are treated with a solution of a natural or artificial resin in an organic solvent before being passed through the rollers. The amount of dry resin should not exceed 0.5% by weight of the treated skin. Processing can be carried out with manual agitation or in mechanical agitators. The concentration of the resin solution varies from 10% and higher, depending on the type of resin (viscosity of the resulting solution) and the amount of leather trimming. Solid or molten, pure resin can be used for processing. Treatment of the skin with resin or its solvent can be performed on the rollers simultaneously with crushing.

Example 1. Leather chips are treated with a 60% alcoholic solution of a phenolic - formaldehyde resin, which, when heated, does not become non-meltable and insoluble. The resin solution consumed 0.75% by weight of the skin. The treated skin is left for some time to volatilize the alcohol in air, and then crushed on a roll mill. At the same time, the capacity of the rollers is increased 10-15 times compared with their performance in case of skipping untreated skin. In addition, when crushing the leather treated according to the described method, a deep grooved surface is not required, and therefore it can be renewed much less frequently.

Example 2. During the crushing of leather scraps on rollers, a small amount (about 0.5% of dry skin) of molten or powdered rosin is set from time to time.

Further processing in both examples is the same-grinding and sieving.

The subject matter of the invention.

1. A method of producing leather iuki, characterized in that to tanned

or non-tanned leather garbage, before passing through rollers, add up to 0.5% of natural or artificial resins or treat them with solutions of these resins in organic solvents.

2- The method of performing the procedure mentioned in claim 1, characterized in that the addition of the resins or the treatment with the resin solutions is carried out during the actual crushing operation.