SU1491887A1 - Method of producing fine leather - Google Patents

Abstract

The invention relates to the leather industry and allows for an improvement in the quality of leather by penetrating dyeing while at the same time increasing their area yield. Chrome-plated semi-finished product is subjected to differentiated planing: in the spinal part to a thickness of 1.4 - 1.5 mm, in the peripheral to a thickness of 1.6 - 1.7 mm, which is 12-14% more than the thickness of the spinal part. Then, rinsing, duplication with chrome tanning agent, neutralization, washing and additional retanning with syntans in the amount of 2-3%, counting on dubbing, with LC = 1.0 - 1.5 and temperature 35-40 ° C for 50-60 min After washing, combined dyeing is carried out - greasing at a dye consumption of 0.35–0.6% of the weight of planed leather and retanning with syntans at LC = 1.5–2 and a temperature of 35–40 ° C for 50–60 min. After unloading, pressing and wiring leathers carry out their finishing. 1 tab.

Description

The invention relates to the chemical treatment of leather, in particular, to methods for making velor or nubuck from cattle hides.

The aim of the invention is to improve the quality of the skin by penetrating through staining while simultaneously increasing their area yield.

According to the method of making velor or nubuck, which includes planing the spinal and peripheral parts of the planed semi-finished product, retanning with chrome tanning agent, neutralization, dyeing, greasing, retanning with syntans and finishing, after neutralizing the semi-finished product retrofit with syntans at their consumption of 2-3% by weight of curved plastics , planing is carried out differentially to the thickness of the peripheral part by 12-14% more than the spinal one, and dyeing and greasing is carried out simultaneously with the consumption of dyes of 0.33-0.6% by weight of the planed leather.

Differential planing up to TOL1TSIN of the peripheral part is 12–14% more than the spinal one, which makes it possible to smooth the influence of the friability of the peripheral part on the quality of the finished leathers, and in combination with the concubation of the skin

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After neutralization with tannas, it is possible to increase the area yield of leathers due to the preparation in the periphery of a full-fledged velor suitable for making shoes. The simultaneous carrying out of dyeing and fattening processes allows the dye to penetrate more and more deeply into the skin structure, causing penetrating staining, which allows reducing the consumption of dyes to 0.35-0.6% of the mass of sliced leather (for light colors).

In addition, the use of a direct black dye 3 for dyeing leather and subsequent retanning with synanum outside result in a color effect of gray. The method is carried out as follows.

Leather for shoes, obtained by the standard method of production of chrome leather from raw cattle, is subjected to differential planing: in the spinal part - to a thickness of 1.4-1.5 mm, in the peripheral - to a thickness of 1.6-1.7 mm that is 12-14% more than the thickness of the ridge, washing on running water, dubbing with chrome tanning agent with 37–42% basicity at a flow rate of 1-2% by weight of planed leather, calculated as chromium oxide, washing, neutralization at LCD 1, 5-2.0 and a temperature of 35-40 ° C for 50-60 minutes with sodium formate and sodium bicarbonate at a cost corresponding to continuously 1-2 and 1.0-1.5% by weight of the skins planed.

After rinsing the skin with running water at 35–40 ° C for 30–40 min, additional retanning with syntans in an amount of 2–3% is carried out, counting on tanning ones, with an LCD 1.0–1.5 and a temperature of 35–40 ° C for 50-60 minutes After rinsing with running water at an initial temperature of 35–40 ° C, followed by an increase to 60–65 ° C, a combined process of dyeing and fattening is carried out: the dispersion agent NF in the amount of 1.0–1.5% is poured into the drum; for 50-60 minutes The preparation of the fat emulsion is carried out in conjunction with dyes. Prepare a fat emulsion by adding hot water at 70- 80 ° C, the pH of the fat mixture is 7.5-8.0. The required amount of kn kp (0.35 0.6%) is dissolved in a small amount

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hot water, then hot water is added at 60-65 ° C. Dye solution is poured into the prepared fat emulsion, everything is thoroughly mixed. The mixture is poured into the drum. The duration of the process. dyeing - fattening for 1.5-2.0 hours. Then, the skin is retanded with syntans at LC 1.5-2.0 and at a temperature of 35-40 seconds for 50-60 minutes. After unloading, pressing, distributing and trimming the edges of the leathers, finishing is carried out, including vacuum drying, pulling (2 times with an intermediate bed), punching, breaking in the drum for 4-6 hours, drying the curtain or stretching it on the frames .

Example 1, Leather, obtained by the standard method of making chrome leather for the upper of the shoe from medium-hunt raw material, planed in the spinal part to a thickness of 1.4 mm, in the peripheral part to a thickness of 1.6 mm, which is 14% more than in the spinal . After planing and rinsing with running water at 40 ° C for 20 min, the skin is retrofitted with a tanning agent of 37–42% basicity at a flow rate of 1% by weight of the skin, counting on chromium oxide, LCD 0.6, 40 ° C for 1, 5 hours. After rinsing with running water at a temperature of 30 ° C for 50 minutes, sodium formate (1.2%) and sodium bicarbonate (1% by weight of planed leather) are neutralized with LC 1.5 and 35 ° C for 50 minutes . Then, the skin is retanded with 3аном% synanum in the amount of tanning, LCD 1.0 and 35 ° C for 60 minutes, rinsing with running water at 35 ° C, followed by increasing the temperature to 60 ° C for 40 minutes and the combined process of dyeing and fattening. Disperser NF is poured into the drum in the amount of 1.5% of the mass of the planed leather, the treatment is carried out at LC 2.0 and temperature 60 С for 60 minutes.

The prepared fat emulsion (VNIIZh paste 4%) and parachlor 250 (2% by weight of the cut leather) are mixed with dyes in an amount of 0.35%. The skin is painted in beige color, which. is obtained by mixing 0.05% acid orange and 0.3% acid methanil yellow. The duration of the process of dyeing - fattening is 1.5 hours. Then, the retanning is carried out

leather treatment with Sintan LSI in the amount of 3% by weight of leather, considering dubbing, at LC 2 and temperature for 60 minutes. After unloading, pressing, distributing, trimming edges, drying in a vacuum dryer to a moisture content of 25%, a 2-fold pull with intermediate bedding is performed. The leathers are polished 2 times with paper (M-63) No. 5. Then, a drum breakdown is carried out for 5 hours, drying the stretching on the frames, cutting the finished leather and measuring the area.

Example 2. The skins obtained according to the standard procedure from the light buoy are processed as in Example 1, but the planing of the peripheral part of the skins is carried out to 1.63 mm TOL1TSIN.

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which is 13% more than spinal. The BNS sintan is added to a flow rate of 2%., And dyeing in a light black color is carried out at a flow rate of dye black direct 0.45% of the mass of planed leather.

EXAMPLE 3 The skins obtained by the standard procedure from cus beef heavy are treated as in Example 1, but the skin planing of the peripheral part is produced to a thickness of 1.7 mm, which is 12% more than the spinal one, and dyeing in gray is carried out with straight black 3 at a consumption of 0.6% by weight of planed leather.

Qualitative indicators of the leather obtained in the table.

The use of the proposed method of wearing velor or nubuck allows improving the quality by achieving a through-process bath and improving the use of leather tanning by 2-3% while increasing the output of leather over the area.

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Claims (1)

The invention method of velor or nubuck, including planing the spinal and peripheral parts of the chrome semi-finished product, retanning with chrome tanning agent, neutralization, dyeing, greasing, retanning with syntans and 71 4918878 (tdrlku, different in that, planed leather, planing is carried out that, in order to improve the quality of the leather differentiated to the thickness of the periphery, the expense of through staining of the pririonn parts is 12-14% more, at the same time increasing the output of ihhrebtovaya, and dyeing and greasing on the area, after neutralization, they are simultaneously carried out with the colourant further additionally dyeing 0.35-0.6% by weight of dyes syntanami with their consumption of 2-3% of may-planed leather.