Way to finish genuine leather

 

(57) Abstract:

The method refers to the leather industry and can be used in the formulation of the lacquer leather for the uppers. The method includes the preliminary pressing, grinding flesh side of the skin, grinding the front surface, the fixing of the flesh side of the casein, applying a sealing of ground-based water-soluble film-forming agents and the penetrator, aging, drying, pre-pressing, podshlifovyvat facial skin surface, applying a pigmented primer in three stages with intermediate pressovaniya, pressing, applying polyurethane varnish drying, a breakdown in the drum, stretched on the frame of the dryer and the final pressing. The method allows to obtain patent leather for the uppers with high performance properties. table 1.

The invention relates to the leather industry and can be used in the formulation of the lacquer leather for the uppers.

There is a method of finishing of leather, including grinding the front surface of the skin, applying a sealing of the soil based on polyacrylate and a penetrator, aging, drying, Taiko, pressing, podshlifovyvat lycaeum polyurethane. (SU authorship, 761520, class C 08 L 33/26, C 14 C 11/00, 07.09.80).

The disadvantage of this method is that it allows you to get a skin with a lacquer finish.

The closest analogue of the proposed technical solution is the method of finishing of leather, including grinding the front surface of the skin, applying a sealing of ground-based water-soluble film-forming agents and the penetrator, aging, drying, pre-pressing, podshlifovyvat facial skin surface, the fixing of the flesh side of the skin casein, application of a pigmented primer-based pigment concentrate, a water-soluble film-forming agents and special additives, extrusion, applying polyurethane lacquer coating and drying. (Handbook of Tanner. Finish. Production control./ Edited Babirovoy N. - M.: Legprombytizdat, 1987, S. 97-102).

The disadvantage of this method is that it is not possible to obtain patent leather with high strength properties.

The technical result of the invention is to improve the quality lacquered leather.

This result is achieved in that in the method of finishing of leather, including the grinding of the penetrator, the aging, drying, pre-pressing, podshlifovyvat facial skin surface, the fixing of the flesh side of the skin casein, application of a pigmented primer-based pigment concentrate, a water-soluble film-forming agents and special additives, extrusion, applying polyurethane lacquer coating and drying, pre-pressing, followed by additional grinding flesh side of the skin effect before grinding the front surface, anchoring spend flesh side before applying the sealing of the soil, application of a pigmented primer is carried out in three stages with intermediate pressovaniya, and after drying, the skin is additionally subjected to a breakdown in the drum, stretching on the frame of the dryer and the final pressing.

A distinctive feature of the proposed method is that the pre-pressing followed by grinding the flesh side of the skin before grinding the front surface, the fixing of the flesh side before applying the sealing of the soil, application of a pigmented primer in three stages with intermediate pressovaniya, a further breakdown of the skin in the drum, stretching on the frame of the dryer and final pressing, bending and wet friction.

The method is as follows.

Leather obtained by the standard method of production of chrome-tanned leather for Shoe uppers from the skins of cattle, after drying and humidification processes and operations is subjected to a preliminary to pressing. Then make a grinding flesh side of the skin, grinding the front surface and the fixing of the flesh side of a 4% solution of casein in the unit "map". After that the car "Kel" if the dryer on the skin caused impregnating the soil. The speed of the feed conveyor 4-5 m/min, the flow rate of the soil 300-350 g/m2. After aging for at least 15 h and drying in a vacuum dryer "income" produce podshlifovyvat the front surface of the skin and application of pigmented ground at the speed of the feed conveyor 4-5 m/min in three stages with intermediate pressovaniya. After pressing on the skin caused polyurethane lacquer coating, is subjected to drying, aging, breakdown in the drum, stretching on the frame of the dryer and the final pressing.

Example 1.

Leather obtained by standard methods from the skins of cattle, pre-pressed, produce grinding flesh side, grinding the front surface and the fixing of the flesh side 4% dissolve Krylova emulsion And, 150 penetrator MO ES, 600 water. After aging, drying and podshlifovyvat front surface on the skin in three stages with intermediate pressovaniya put pigmented primer of the following composition, wt.h.: 140 pigment concentrate, 300 foaming agent, Melia Promul C-80, 50 addition of Meli Top 285, 40 additive Filler D, 100 water. After pressing on the skin to cause the lacquer coating of the following composition, wt.h.: 1000 polyurethane varnish WT-2547, 40 casein, 30 thickener LV-03, 30 Grif-additive HM 183, 12 hardener XR 2530, 5 metal complex dye. After aging of the skin is subjected to a breakdown in the drum, stretching on the frame of the dryer and the final pressing.

Example 2.

Leather obtained by standard methods from the skins of cattle, trim as in example 1, but as a sealing of the soil used in the following composition, wt. hours : 200 polyurethane dispersion Melia Rubbers A-775, 100 polyurethane dispersion Melia Rubbers A-715, 150 penetrator, Melio P A, 600 water, and as a lacquer coating using the composition containing the wt.h.: 1000 polyurethane varnish Top Aquatic L, 40 additive Aquatic pasta L, 30 g LV-03, 30 Grif-additive, Melia WP 5230, 12 hardener AKU, 5 metal complex dye.

Example 3.

Skin, polarizat the following composition, wt.h.: 140 pigment concentrate, 300 emulsion of BMP-3, 50 casein, 40 wax emulsion, 100 water.

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

Using the proposed method allows to obtain patent leather for the uppers fashionable range with high performance properties.

Method of finishing of leather, including grinding the front surface of the skin, applying a sealing of ground-based water-soluble film-forming agents and the penetrator, aging, drying, pre-pressing, podshlifovyvat facial skin surface, the fixing of the flesh side of the skin casein, application of a pigmented primer-based pigment concentrate, a water-soluble film-forming agents and special additives, extrusion, coating, polyurethane coating and drying, characterized in that the pre-pressing, followed by additional grinding flesh side of the skin effect before grinding the front surface, anchoring spend flesh side before applying the sealing of the soil, application of a pigmented primer is carried out in three stages with intermediate pressovaniya,mu pressing.

 

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FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

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