SU77407A1 - The method of making chrome leather from the skin of a shark with spikes - Google Patents

Description

Removal of thorns from the skin of a shark by spreading the front surface of the skin in the hide, with a concentrated hydrochloric acid peak. It often leads to destruction of the entire dermis.

The proposed method for removing spikes between the two phases of chrome tanning eliminates the risk of crumbling and provides chrome leather of higher quality.

The proposed method is as follows.

Wet-salted canning skins are washed in a long-run in running water for 30 minutes. at a water temperature of 14–16 ° C, the meat cuts on the deck are removed; a second flush is carried out in the barge under the same conditions. The skins are drummed with a solution of ammonium sulphate of 35 g / l and salt 50 g / l for 1.5 hours. with a liquid coefficient of 2. Vrashchennya drum variably 4-6 rev / dchin.

In the first phase of tanning, chromium oxides take 1.3% of the wet-salted weight of hides, with an extract basicity of 30-32%, the temperature of skin welding after the first tanning phase is maintained within 65-70 ° C.

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Wrapping on goats occurs within 3-4 hours.

To remove the thorns, a solution of hydrochloric acid of a concentration of 90-120 and sodium chloride 80-gli of liquid with a liquid coefficient is prepared; the temperature of the solution is 16 ° C. Processing of hides with this solution of oOM is carried out within 6-8 hours. until the spikes dissolve.

Neutralization treated

hides are produced by soda up to a hydrochloric acid content in the spent solution of 0.2-0.6 g / l. After that, the face is cleaned on the deck with the removal of the remainder of the spikes, the wiring on the validating adjustable machine, gouging on the machine and determining the weight after gouging.

In the second phase of the dz-blend, 1.6% chromium oxime is taken (from the weight planed}, 5% common salt with a liquid coefficient of 0.6. The semifinished product is thrown into the salt solution and grown in the drum for 5-10 minutes, then on the drum Pour chromic extract with a basicity of 40-42%.

The temperature of skin sealing after tanning is 80-85 ° C.

Further operations are performed in the same way as for all other chrome leathers.

3S7 No. 77407 In the same way, the scale-like layer can be removed from other sharks. The subject of the invention. A method for producing chromic skin from shark skin with spikes without sweeping-ash operations, in that the removal of thorns with the help of a concentrated hydrochloric acid pickle with subsequent neutralization and cleaning of the face is carried out between the two chrome tanning phases.