The method of processing of raw hides

 

(57) Abstract:

The method relates to the processing of raw hides and can be used in otlochno-ash manufacturing processes of the skin for different purposes and range. Leather raw material is subjected to preliminary: soaking off in an aqueous solution of nonionic surfactants, sodium carbonate and an antiseptic. Then perform: soaking off in an aqueous solution of sodium carbonate, alkaline protease, nonionic surfactants, magnesium oxide and antiseptic and liming. The technical result is the expansion of technological capabilities of the method and improving the quality of the leather. table 1.

The invention relates to the leather industry and can be used in making leather for various purposes and assortment.

A method of processing of raw hides, including: soaking off of raw materials in the presence of a neutral or acidic protease in an amount of 0.1 to 0.8% by weight of the raw materials, processing with hydrogen peroxide in the presence of salts of heavy metal and acid in their consumption: 0,5-1,5, 0.05 to 0.25 and 0.6 to 1.0% of the weight of raw material and liming. (EN 2096466 C1, CL 14 With 1/04, 1/06, 20.11.97).

The disadvantage of this method is that it involves the use of hydrogen peroxide and execname connections.

The closest analogue of the proposed technical solution is the method of processing of raw hides, including pre: soaking off in an aqueous solution of nonionic surfactant in an amount of 0.1 to 0.2% by weight of the raw material, washing,: soaking off in an aqueous solution of sodium carbonate, alkaline protease and nonionic surfactants at their expense, respectively, of 0.8-1.2, 0.2 and 0.3 and 0.2-0.3% by weight of the raw materials, the processing of sulphide of sodium, liming and glutton liming. (EN 2036970 C1, CL 14 With 1/04, 1/06, 09.06.95).

The disadvantage of this method is that it provides multiple processing raw alkaline reagents, which leads to excessive loosening of the structure of the dermis and reduce the strength properties of the finished leather, as well as improve their tbsistuste. In addition, this method is suitable for the production of leather for clothing and haberdashery items and allows you to get high-quality leather for other purposes, such as leather for the uppers.

The technical result of the invention is to expand the technological capabilities of the method and improving the quality of the leather.

This result is achieved in that in the method of processing of raw hides, including pre: soaking off in an aqueous solution of nei is ionogenic surfactants and liming, preview: soaking off the produce in the presence of sodium carbonate and an antiseptic in their consumption respectively of 0.1-0.2% and 0.05-0.07 per cent by weight of the raw material, and are: soaking off in the presence of magnesium oxide in the amount of 0.3-0.5% and an antiseptic in an amount of 0.1 to 0.2% by weight of raw materials.

A distinctive feature of the proposed method is that the preliminary soaking in the presence of sodium carbonate and antiseptic and soaking in the presence of magnesium oxide and an antiseptic allows you to smoothly raise the pH of raw materials, which excludes such a crime, ash screed gives the possibility to perform the ashing process and get the skin for different purposes with high performance properties.

Preliminary soaking at a flow rate of sodium carbonate less than 0.1% and soaking at a flow rate of magnesium oxide less than 0.3% by weight of the raw material does not allow to optimally increase the pH of the raw materials and to prepare the structure for liming. The increased costs mentioned reagents of more than 0.2% and 0.5% by weight of raw materials is inappropriate. Preliminary soaking and soaking at a flow rate of antiseptic less than 0.05% and less than 0.1%, respectively, does not allow to protect raw materials from bacterial damage. The increased costs antiseptic excess of 0.07% and 0.2 ith.

Raw cattle macromolecule canning subjected to preliminary: soaking off for 1.0 to 1.5 hours at a temperature of 22-24C and W.to. the 2.0-2.2 in the aqueous solution of nonionic surfactant, an antiseptic and sodium carbonate at their expense, respectively, of 0.1-0.2%, 0.05 to 0.07% and 0.1 to 0.2% by weight of raw materials. After draining the bath produce: soaking off for 13-15h at a temperature of 22-24C and W.to. of 2.0-2.2 in an aqueous solution of sodium carbonate, alkaline protease, nonionic surfactants, magnesium oxide and an antiseptic in their consumption accordingly 0,6-0,7%, 0,15-0,25%, 0,1-0,2%, 0,3-0,5% and 0.1 to 0.2% by weight of raw materials. Further processes and operations, since ashing, carried out by known technologies.

Example 1. Raw cattle macromolecule canning subjected to preliminary: soaking off for 1.0 hours at a temperature of 24C and W.to. 2.0 V aqueous surfactant solution of neonols (TU 2483-077-05766801-98), antiseptic don-52, representing the salt of aliphatic amines and low molecular weight fatty acids, and sodium carbonate at their expense, respectively, to 0.1%, 0.05% and 0.1% by weight of raw materials. After draining the bath produce: soaking off for 15 h at a temperature of 24C and W.to. 2.0 V aqueous solution of sodium carbonate, alkaline protease, It G-20X, neonols, magnesium and antiseptic don-52 in their consumption according to the method of production of haberdashery leathers.

Example 2. Raw cattle macromolecule canning process as in example 1, but pre: soaking off in an aqueous solution of nonionic surfactant of Prevotella produced in the presence of the antiseptic aracic YES (Germany) and sodium carbonate in their consumption accordingly to 0.15%, 0.06% and 0.15% of the mass of raw materials, as: soaking off the lead in an aqueous solution of sodium carbonate, the alkaline protease of pelvic (Germany), Prevotella, compounds of magnesium from its oxide marpin 3020 (Germany) and the antiseptic aracic YES when their consumption accordingly 0,65%, 0,2%, 0,15%, 0,4% and 0.15% from the mass of raw material. Further processes and operations, since ashing, carried out according to the method of production of leather for the uppers natural outer surface.

Example 3. Raw cattle macromolecule canning process as in example 1, but pre: soaking off in an aqueous solution of neonols produced in the presence of the antiseptic katamin AB-alkyldimethylbenzylammonium and sodium carbonate in their consumption respectively 0.2%, 0.07% and 0.2% of the mass of raw materials, as: soaking off the lead in an aqueous solution of sodium carbonate, alkaline protease, It GH, neonols, magnesium and ketamine AB at their expense, respectively 0,7%, 0,25%, 0,2%, 0,5% and 0.2% by weight of raw materials. Further processes and OPE the ptx2">

Example 4. Raw cattle macromolecule canning process as in example 1, but pre: soaking off in an aqueous solution of neonols produced in the presence of an antiseptic don-52 and sodium carbonate in their consumption accordingly to 0.05%, 0.04% and 0.05% of the mass of raw materials, as: soaking off the lead in an aqueous solution of sodium carbonate, alkaline protease, It GH, neonols, magnesium and Dona 52 at their expense, respectively 0,5%, 0,1%, 0,05%, 0,2% and 0.05% by weight of raw materials.

Example 5. Raw cattle macromolecule canning process as in example 2, but pre: soaking off in an aqueous solution of Prevotella produced in the presence of antiseptic arcita and sodium carbonate at their expense, respectively, of 0.25%, 0.08% and 0.25% by weight of the raw materials, as: soaking off the lead in an aqueous solution of sodium carbonate, the alkaline protease of pelvic With, Prevotella, machine 3020 and arcita YES when their consumption accordingly 0,75%, 0,3%, 0,3%, 0,6% and 0.3% by weight of raw materials.

Quality indicators received skin compared to skin on the prototype presented in the table.

Using the proposed method allows to get the skin for different purposes and range with high performance properties.

The way of processing leather is cmoku in an aqueous solution of sodium carbonate, alkaline protease and nonionic surfactants and liming, characterized in that the pre: soaking off is performed in presence of sodium carbonate and an antiseptic in their consumption respectively of 0.1-0.2% and 0.05-0.07 per cent by weight of the raw material, and are: soaking off in the presence of magnesium oxide in the amount of 0.3-0.5% and an antiseptic in an amount of 0.1 to 0.2% by weight of raw materials.

 

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FIELD: fur industry.

SUBSTANCE: fur fells are treated with aqueous solution of nonionic surfactant and antiseptic, which is aqueous dispersion of acrylic copolymer with dimethylformamide at ratio (1.0-1.1):(5.0-5.1), respectively.

EFFECT: improved physico-mechanical characteristics of fur fells and improved environmental condition.

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