CS276871B6 - The method of production of natural leather - Google Patents

Abstract

It concerns the production of natural leathers, which in design resemble natural exotic types of leather. The basic raw material for tanning is leather from the lower part of the legs of a grouse or waterfowl, preferably a turkey.

Description

.1

Method of producing natural leather

Field of technology

The invention relates to a process for the production of natural leather, the design of which resembles natural exotic types of leather.

Prior art

In the industry using leather as a basic raw material, in the production of clothing, footwear and leather goods, in addition to beef, pork, calf and other natural and artificial leathers, exotic types of leather obtained from the skin of various crocodiles, snakes, lizards, etc. are used. ..The basic raw material for exotic types of leather is obtained in the world by legal and illegal destruction of these species of animals, some of which are on the verge of extinction. The problem of extinction is approached by the consumer, because the high aesthetic level of exotic leathers is accompanied by high economic demands of products made from them, even when the basic raw material for the production of exotic types of leather is obtained, for example, through specialized breeding stations.

The essence of the invention

It has now been found that natural exotic types of leather can be replaced by the production of natural leather with a design reminiscent of natural exotic types of leather, according to the method of the invention.

Its essence lies in the fact that the basic raw material for tannery processing is leather from the lower part of the legs / runners / raking or aquatic poultry, preferably turkeys.

The basic raw material can be obtained from the poultry processing industry, where it is waste that is incinerated in rendering plants. Due to the fact that the feet are damaged by industrial processing on the line in some cases, it is necessary to sort this waste for the purposes of tanning processing. In the case of turkey legs, medium sizes corresponding to turkeys weighing 7 to 10 kg are most suitable.

It is advisable to remove the skin from the legs, after appropriate cutting, carried out in a fresh state, or later from the legs preserved in the salt solution. The separated raw skin is placed in a common salt solution for at least 24 hours, after which the front side is cleaned, the rest of the fat is removed and the raw material thus prepared is further processed in a tannery. Chemical reagents and basic working procedures are chosen alternatively in the individual phases of the tanning process (for example chromium-plating, tanning) and the whole processing is adapted to the fashion trend, the intended use of leather as a final product and technical possibilities.

By processing the leather from the legs of rake and waterfowl, high-quality natural leather is obtained, which, with its unique design, meets the most demanding aesthetic criteria.

t The high economic efficiency of the leather thus obtained is given by the basic raw material itself and the possibilities of obtaining it.

Examples of embodiments of the invention

Example 1

Goats from the lower parts of turkey legs, from animals weighing 7 to 10 kg were used for processing according to the invention. The skins were obtained by manual pulling after cutting, the incision being made around the top of the leg and then carefully to the toes along the back of the leg. . The skin was removed in the raw state. The separated raw skin was placed in a 10% saline solution where it was left for 24 hours. Subsequently, the front and back sides were gently cleaned and the remaining fat was removed. After this treatment phase, the rawhide was preserved in a 10% common salt solution for 3 days. This time was needed to collect the sufficient amount needed for economical tillage processing.

Further tanning processing took place as follows:

The tanning barrel was soaked with the basic raw material for about 16 hours, at a temperature of 24 ° C, where detergents were used as a disinfectant and wetting agent. Subsequently, the skins were leached using calcium oxide and sodium sulphide at 22 ° C and decalcified with ammonium sulphate for about 30 minutes at 22 ° C, which increased to 35 ° C during the washing period. The raw material thus treated was further pickled in the usual manner for about 30 minutes at a temperature of 37 ° C and, after the pickling was completed, pickled using hydrochloric acid and sodium chloride for about 1 hour at a temperature of 24 ° C. The leathers were further subjected to chromium-plating with preparations based on aluminum and chromium salts for about 16 hours at a temperature of 22 to 24 ° C.

The final color treatment was subsequently solved alternatively by hand painting, resp. by spraying with a pistol. Drying was performed by free drying and stretching of the leather and ironing alternatively by manual ironing and machine ironing. The final use was taken into account for the intended use, while the stop was placed to emphasize the richness of the structure and the natural design.

The obtained natural leather showed the properties listed in * the following table 1:

Table 1 i

Parameter

Measured values

Static absorbency: in cm / 100 g

Elongation. per ball: in mm / 3 reps / compared cowhide 24 hours

200 245

5.5

5.8

5.0

Tensile strength: 2.5 in MPa1.3

1.9 compared cowhide12

Elongation: in%

12.4

19.6

14.2 compared cowhide 43 36

The leathers produced by the process according to the invention have been used in the production of a collection of shoes, leather haberdashery, leather jewelery and small decorative and utility items, in which their utility properties and high decorativeness have been confirmed.

Industrial usability

According to the method of the invention, it is possible to process part of the waste from the poultry processing industry - in particular! legs of turkeys, but also other species of burrowing or waterfowl. The tailor-made leathers made of these legs are suitable for use in the footwear, haberdashery and textile industries, as well as in the production of jewelery and various decorative items.

Claims (1)

PATENT CLAIMS A method of producing natural leather, reminiscent of natural exotic types of leather, characterized in that a goat from the lower part of the legs of a rake or waterfowl, preferably a turkey, is used as the basic raw material for tannery processing. End of document