SU55069A1 - The method of preparation of the dry preparation of bards for softening fur sheepskin, leather and fur - Google Patents

Description

In the author's certificate No. 4125, a method is described for the manufacture of sheepskins and furs with processing them after being soaked by barda, which is garbage from the distillery industry.

Despite the number of advantages of this method of dressing in terms of product quality, increase in labor productivity, etc., this method, however, has limited application possibilities due to the very poor transportability of bards, since it contains more water and is also inconvenient when dealing with in production,

These inconveniences are offered to be eliminated by preparation from barda of the dry concentrated preparation with the softening properties inherent in the crude bard.

The preparation process of the proposed preparation is as follows. Salt is added to the raw bard in the amount of 20-30 g /./g. This additive completely protects the bard from mold damage both in its raw form, and especially in the dry concentrated form, since in the latter case the concentration is

comes to 15-20% by weight of the dry drug.

Salt, which protects the latter from spoilage, is not at the same time ballast, since salt is still being given during the processing of sheepskin and softening (the amount of which, respectively, should be reduced, taking into account the salt introduced into the working solution together with the softener). After the salt has been given to the bard, a concentrated solution of hydrolyzed proteins is added to it, which is obtained by hydrolyzing the raw core with strong sulfuric acid, followed by averaging the solution with alkali. The hydrolyzate is given in bard based on the production of 2-5 g / l of nitrogen in excess of nitrogen in the bard, which is present in the bard itself. The hydrolyzate may not be given to the bard, but in this case it must be introduced directly into the mortar solution when treating sheepskin, fur or leather with it.

Dry sawdust is added to the bard solution prepared in this way at the rate of 10–20% of the weight of raw bard, depending on its consistency, until a sufficiently thick mass is obtained. The latter then enters drying, either on racks in the open air, in the sun or under a canopy, or in specially adapted drying chambers. The mass, dried to an air-dry state (15–20% moisture), is ground into flour, after which the preparation is finally ready and can flow into the package.

It should be noted that with the preparation method described above, the organic acid contained in the bard, which is essential for the softening process, volatilizes; therefore, it is necessary to add some acetic acid to the working solution of the softener. However, it is more expedient to preserve the organic acid contained in the bard by averaging it with soda, i.e., transferring it to the sodium salt, from which it can be extracted again by preparing an equivalent amount of strong mineral acid to the solution.

For processing - softeners of sheepskin, furs, etc., a working solution is prepared containing 20-30 g / of the above preparation, 30-50 g / l of sodium chloride and 3-5 g / l of acetic acid.

this amount of acid also includes the acid contained in the preparation itself, so the addition of acid is made after a preliminary analysis of the working solution for the content of organic acid in terms of acetic acid. The temperature of the working solution before loading the material being processed is 39 °, and during the softening process it is maintained at a level of 35-37 °; liquid ratio 1: 4. The processing time for sheepskin is from 2 to 4 days with the drum rotating every two hours for 5 minutes. The end of the softening is recognized by the weakening of the epidermis in the groin, as well as by some weakening of the hair, which when pulling it out with some effort must be yanked without cod.

After softening, the product receives a wash in warm (35 °) water with a content of 10–20 g / l of salt for 1-2 hours, and then a wrapping for 8–10 hours.

The subject matter of the invention.

Claims (2)

1. A method of preparing a dry preparation from bards for softening fur sheepskin, leather and fur, characterized in that sodium is added to the raw bard with or without a concentrated protein hydrolyzate and sawdust is added to the resulting solution, after which the latter is dried and ground. 2. A method according to claim 1, characterized in that soda is added to the bard of organic acids in order to preserve it in the bard.