CS264780B1 - A method for the oxidative processing of sheepskins - Google Patents

Abstract

The leather is treated in a water bath using 0.1 to 5% by weight of an oxidizing agent, which ensures increased efficiency in the breakdown of proteins and natural fats from the skin and hair, thereby increasing the elasticity and reducing the weight of the finished fur. It is applied at a pH value of 6.5 to 8.5 and a temperature of 30 to 40 °C for 30 to 120 minutes.

Description

The present invention relates to a process for the oxidative treatment of mutton skins on a wet road followed by mechanical treatment of a belt and a pile.

Current technology for the production of sheep and lambs uses a sequence of operations 1 to 2, washing, pickling, washing. These operations are followed by belt and hair treatment to remove subcutaneous tissue, fat and hair impurities. In domestic mutton, a high fat content is present both in the belt and in the hair. This animal fat causes a reduced efficiency of the wetting and pickling operations, making it difficult to perform the shredding, scouring and shearing operations. The end result is different elasticity and weight of mutton skins. The aforementioned disadvantages are multiplied in the processing of dried sheep, where the efficiency of the wetting and pickling operations is at most 50%.

The above-mentioned disadvantages are partially eliminated by the method of oxidative treatment of mutton skins, characterized in that the mutton is treated in a water bath of 80 to 500% by weight. % of leather, containing 0.1 to 5 wt. of the oxidizing agent at a pH of 6.5 to 8.5 and a temperature of 30 to 40 ° C for 30 to 120 minutes. A biodegradable emulsifier or 0.2 to 0.5 wt. a pancreatic pickling composition at pH 7 to 8.5 for 30 to 60 minutes.

Oxidative treatment acts in the structure of the belt to break down certain end and construction groups of proteins and lanol fats of the belt and hair. As a result, products are soluble and dispersible even in a weakly alkaline environment. A biodegradable dispersant, a product of the condensation of chloroic acid and an alkaline disintegration product of collagen is suitable for uniformizing the oxidizing action and improving transfer to the aqueous environment. This treatment is followed by hair cutting, shearing, scouring. We treat the mutton-free scum and impurities in the aquatic environment with an enzymatic agent, wash the degraded interfibrous proteins and further process the skins according to the assortment technology. The final effect is the reduced weight of the fur and good elasticity. For dried sheep, the spreading effect is increased from a maximum of 50% to 90%. The oxidation treatment is carried out with hydrogen peroxide, permetic acid, potassium perchlorate or sodium perborate. The oxidation treatment method is shown in the following examples.

He did

After the first water soak, we act on the fur in the following bath: The amount of chemicals is given in g / l in the examples.

400 wt. water (fur weight) 30 ° C g ethylene oxide emulsifier g hydrogen peroxide 35% wt.

0.2 g of ammonia 25% w / w

The oxidation treatment time is 1 hour. This is followed by machine combing, punching, shearing and shearing. The following is washed and pickled in the following bath:

400 wt. water (net weight) 38 ° C g pancreatic preparation 1000 EJ / g 0.2 g ammonia 25% w / w pH 8

The pickling time in the sashpline is 1 hour, followed by intensive washing, and further processing is carried out in the usual fur-eyed manner.

Example 2

The oxidation treatment is carried out in an agitated container for one hour using potassium perchlorate.

200 8 wt. (w / w) 25 ° C

0.4 wt. potassium perchlorate

8 is an emulsifier of the type of chlorooleic acid condensate and a glutin hydrolyzate

This is followed by mechanical processing and pickling. \

500 wt. water (wt. skin) 38 ° C

0.02 g bacteriolase 50 000 EJ / g

After pickling, we wash intensively, further processing is carried out in the usual way.

Example 3

Operate the dried mutton and soak in the next bath

500 wt. water 30 ° C g sodium perborate g sodium lauryl sulphate emulsifier

We act for 30 minutes and add

0.01 g bacteriolase 50 000 EJ / g

0.2 g of ammonia 25% w / w

Operate for 120 minutes and add 0.2 g of urea or 0.2 g of formaldehyde 36% w / w. After an hour of mutton, wash and then mechanical processing. Other pickling operations, cropping, tanning according to common technology.

Claims (3)

Process for the oxidative treatment of mutton skins, characterized in that the mutton is treated in a bath of 80 to 500% by weight. % of leather, containing 0.1 to 58 wt. of the oxidizing agent at a pH of 6.5 to 8.5 and a temperature of 30 to 40 ° C for 30 to 120 minutes. 2. A method according to claim 1, characterized in that a biodegradable emulsifier is fed to the belt oxidative treatment bath. 3. A process according to claim 1, wherein 0.2 to 0.5% by weight of the oxidizing treatment bath is added. pancreatic pickling agent at pH 7 to 8.5 for 30 to 60 minutes