SU1442555A1 - Method of dehairing paired hides - Google Patents

Abstract

The invention relates to the leather industry and allows the technological capabilities of the method to be expanded by providing simultaneous preservation of the hides while maintaining the quality of the leather. Paired skins. is treated with a solution containing, in wt.%: acetic acid (100%) 1-3, sodium chloride 4-6 and water the rest, at Zh 1-3, temperature 20-30 C for 24 hours. Then lay in a stack at a temperature of 15-25 C for 5-7 days. 1 hp f-ly, 2 tab. (ABOUT

Description

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The invention relates to methods for the chemical treatment of cattle hides and can be used in the leather industry for preserving skin dry skins.

The aim of the invention is to expand the technological capabilities of the method by simultaneously providing preservation of hides while maintaining the quality of the skin.

The essence of the method is that paired skins after washing

and fissures are treated with an aquatic plant using water by the method of Feldvor, containing, in wt.%: acetic acid mana-Lishanskaya (unsatisfactory - acid (100%) 1-3; trusted salt 4-6; water, the rest, with LCD .1-3, temperature 20-30 C for 24 h,

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then they lay in a stack at 15-25 ° C for 5-7 days.

Example 1, Washed and processed fresh leather hides of cattle are treated in the drum with the solution containing. 1% 25 100% acetic acid, 4% salt and 95% water, with LCD 3, temperature 20 ° С, for 24 hours. Processing mode: the first 0.5 hours, the rotation is continuous, then for 5 minutes after each - 30 minutes 4 hours rest. Next, the raw material is discharged, stacked and stored at 15-25 s for 5 days. Machine hair removal is carried out after 3–5 days of storage .35

PRI mme R 2. Washed and industrial pair leather hides of cattle are drummed with a solution containing 3% 100% acid salt and 4% boiled salt and 93% water. 1, temperature 20 ° С; within 24 hours. Processing mode: the first 0.5 hours of rotation, continuous, then for 5 minutes every 4 hours of rest. Next, the raw material is discharged, 45 is put in a pile and stored at 5-25 ° C for 5 days. Maatine hair removal is carried out after 2–5 days of storage,

PRI me R 3. Washed and promoted — resolved fresh leather hides of cattle are treated in a drum with a solution containing 3% 100% acetic acid, 6% boiled salt and 91% water, with LC 1, temperature , within 24 hours. Processing mode: the first 0.5 hours of rotation is continuous, then for 5. minutes through the apparent preservation of the skins - more microbes in 1 g of hides and organoleptically (by smell and appearance). The strength of the bond between the hair and the dermis is determined by the modified Lennox method (hair removal can be carried out when the bond between the hair and the dermis is less than 200 g / cm).

The data analysis is shown in table 1

The proposed composition for processing paired skins ensures their safety for 5-7 days. Such a period is sufficient to complete the production batches and transport them to the leather factories.

Table 2 shows the chemical and physico-mechanical properties of the finished elastic chromic, produced from the gecks, obtained by the proposed method.

The proposed method provides a combination of processes of preservation and dehairing, intensifies the technological process of tanning, and provides skins that meet the requirements of GOST.

Claims (1)

Formula of gain I. The method of dehairing paired skins by treating them with an aqueous solution of acetic acid and table salt, which is characterized by the fact that, in order to expand the technological capabilities of the method by simultaneously ensuring the preservation of the skins while maintaining the quality of the skin, the skins are processed in a solution containing the indicated reagents in the following amounts wt.% Acetic acid (100%) 1-3 four hours rest. Next, the raw material is discharged, stacked and stored at 15-25 ° C for 7 days. Machine hair removal is carried out after 1-7 days of storage. PRI me R 4 (by a known method). Samples of paired skins of cattle are treated with a solution of 0.25% acetic acid and 1} 4 g / l of sodium chloride at LC 3, temperature 20 ° C, for 24 hours. Then they are unloaded and stored in a stack. The beginning of the deterioration of the hides is determined by the wire counting of microbes by the Feldman-Lishansky method (unsatisfactory for the preservation of hides - more than microbes in 1 g of hides) and organoleptically (by smell and appearance). The strength of the bond between the hair and the dermis is determined by the modified Lennox method (hair removal can be carried out when the bond between the hair and the dermis is less than 200 g / cm). The data analysis is shown in table 1. The proposed composition for processing paired skins ensures their safety for 5-7 days. Such a period is sufficient to complete the production batches and transport them to the leather factories. Table 2 shows the chemical and physico-mechanical properties of the finished elastic chromic, produced from the gecks, obtained by the proposed method. The proposed method provides a combination of processes of preservation and dehairing, intensifies the technological process of tanning, and provides skins that meet the requirements of GOST. Formula of gain I. The method of dehairing paired skins by treating them with an aqueous solution of acetic acid and table salt, which is characterized by the fact that, in order to expand the technological capabilities of the method by simultaneously ensuring the preservation of the skins while maintaining the quality of the skin, the skins are processed in a solution containing the indicated reagents in the following amounts wt.% Acetic acid (100%) 1-3 UA2553 Cooking salt. The method according to p. 1, of tl and h of the water of the Other, and with the fact that the processing of with subsequent staining in the stack when in solution is carried out at the LCD 1-3 n at a temperature of 15-25 s for 5-7 days. service 20-30 s for 24 hours The bond strength of the hair with the dermis, g / cm, after storage, days: 2 3 4 5 The number of microbes in 1 g of the skin, -Y, after storage, days: one 2 3 4 5 6 7 table 2