SU1475922A1 - Leather finishing method - Google Patents

Abstract

The invention relates to light industry and allows improving the quality of leather with facial defects due to the fact that drying and embossing are carried out simultaneously on a vacuum unit by placing a leather semi-finished product with a front surface to the unit's mesh.

Description

The invention relates to the leather industry, in particular to the production of leather for the top of shoes and haberdashery, and can be used in the manufacture of leather from raw materials with facial defects.

The purpose of the invention is to improve the quality and expansion of the range of leather produced from raw materials with facial defects.

When drying the skin with the front surface of the mesh, the mesh structure of the vacuum aggregate is printed on the skin, i.e. the front surface acquires alternating protrusions and depressions, which in itself masks facial defects on the skin. In this way, a stable embossing effect is achieved without additional operation, and the resulting depth of the depressions allows further grinding only convex sections. At the same time, for leathers with large facial defects, deep grinding is performed, then pressed with a dust-like plate. For skins with minor facial defects, light sanding is carried out, then pressed with a smooth slab, which preserves the natural pattern and makes it possible to release leather with a natural facial surface from raw materials with facial blemishes. Example 1. Finishing of leather with an artificial face surface for the upper of a chrome tanning shoe is carried out according to the following scheme: wiring; drying of 1-, the front surface of the skin to the grid of the vacuum unit at a temperature of the heating plate 75 ° C with a residual pressure of 700 mm RT. Art. to skin moisture 22-26%;

Further, according to a known method, sanding of convex skin areas is carried out, sanding paper No. 4.

EXAMPLE 2. Leather with an artificial face surface with more pronounced facial defects is made as in Example 1, the difference is to conduct the grinding of convex skin areas in the 2nd stage: grinding 1, grinding, paper No. 6; grinding 2nd, grinding paper no. 2.

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Example. The leather is decorated with a natural measure for the top of the shoe of the chrome tanning of raw materials with a slight defect on the face, according to the following pattern: wiring; drying of 1-, the front surface of the skin to the grid in the KuGN gregata at a temperature of Greek plate 75 ° C, residual pressure of 700 mm Hg. until the skin moisture is 22-26%, then a well-known technique is used to grind convex areas of the skin with sandpaper No. 2, and pressing the remaining irregularities of the front surface with a smooth plate.

Leather, finished in example 1 and 2, have an artificial front surface with a uniform color over the entire area without failures of the dressing, their grade improved compared to

3922h

with leather, trimmed by the known method on average by 0.5%.

Claims (1)

 T the mechanical and mechanical properties of 5 prototypes of leather did not deteriorate. Multiple bend coating tests showed an increase in adhesion of the coating to the skin. Invention Formula 0 The method of finishing the skin, consisting in drying on a vacuum unit, grinding convex areas of the front surface, applying impregnating primer, pressing, embossing, five 0 top dyeing about so that, in order to improve the quality of the skin with facial defects, drying and embossing are carried out simultaneously on the vacuum unit by placing the leather semi-finished product with the front surface to the grid of the unit.