RU2471704C1 - Method of making leather articles (versions) - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of leather articles. Proposed method comprises marking and cutting leather of combined tanning made from cattle skin. Locking made parts on surface on the table of unit with optical laser oscillator, thermal embossing of, at least, portion of part surface to make raised surface. It comprises extra thermal treatment of raised surface by pyrograph, applying protective coating on the part to make articles thereof.

EFFECT: higher waterproof properties.

2 cl, 2 tbl, 3 dwg

Description

The group of inventions relates to the field of light industry, namely to leather goods production.

A known method of burning engravings with the formation of graphic and symbolic figures on a surface made of wood, plastic, leather, fabric or other material by pressing the heated tip of an electric pencil, using which the brightness of the burned trace is controlled by changing the power of an electric pencil (Japanese application No. 63-199566 published on 02.19.1990).

The disadvantages of this method are its complexity, low productivity and obtaining a large number of defective products.

Also known is a method of producing products with a relief surface (see RF application No. 93057115, class B23K 26/08, publ. 07/20/1996), which can be used to process various materials (metal, wood, bone, leather, plastic). In the known method, the product is thermally processed using a laser to obtain a pattern on the surface.

The disadvantages of this method is the low productivity and insufficiently high quality of the products.

The objective of this group of inventions is to eliminate the above disadvantages.

The technical result consists in increasing productivity, improving the quality of finished products and the longevity of their operation by providing resistance to moisture and dust.

The technical result is ensured by the fact that the method of manufacturing leather products according to the first embodiment includes marking, cutting out the tanned leather of combined tanning developed from cattle hides, fixing the obtained parts on the surface of the installation table with an optical quantum generator (OKG), thermal embossing of at least a part surfaces of parts by radiation with the formation of a relief surface, the subsequent additional heat treatment of the obtained relief surface with a pyrograph, is applied e protective coating to the details and formation of products of received items.

The technical result is ensured by the fact that the method of manufacturing leather products according to the second embodiment includes marking, cutting the tanned leather of combined tanning developed from cattle hides, fixing the obtained parts on the table surface, thermal embossing of at least part of the surface of the parts with a pyrograph pen with the formation of a relief surface and with obtaining in the process of thermal embossing a density gradient caused by the simultaneous force applied to the pyrograph handle, differently depth of stamping and the use of at least two different interchangeable tips for the pyrographic handle, applying a protective coating to the parts and forming the product from the parts obtained.

The technical nature of the claimed group of inventions is illustrated by the following illustrations:

Figure 1 - block diagram of the installation with the laser used for the heat treatment of cut parts;

Figure 2 is a flowchart describing the sequence of operations of the method according to the first embodiment.

Figure 3 is a flowchart describing the sequence of steps of the method according to the second embodiment.

To implement the inventive method according to the first and second embodiment, use is made of a skin with a thickness of 0.8-3 mm, painted in light color, combined tanning, developed from cattle skins, with the characteristics shown in Table 1.

Table 1 Name of indicator Value Moisture content, % 10-16 Mass fraction of chromium oxide,% 1.1-2.0 Mass fraction of substances washed out by water,% 5 pH of potassium chloride extract 4.0-5.5

Carry out marking, cutting pieces of skin.

When implementing the method according to the first embodiment, the obtained parts are fixed on the surface of the table of the installation containing the optical quantum generator, and thermal embossing is performed by radiation. The installation may contain carbon dioxide laser, operating in continuous mode and providing a wavelength of 10.6 μm or 9.6 μm.

In addition, the installation is equipped with focusing optics of high power density, consisting of mirrors and lenses, which reduces the spot size and increases the power density of the laser beam. The installation also has a USB port and is connected to a computer programming the generation of laser radiation. The software (CorelDraw, IIIustrator, PhotoShop, CAD) installed on the computer provides the ability to receive various patterns on the surface of cut pieces of leather, as well as images belonging to other genres of fine art.

To implement the method according to the first embodiment, an OKG is used with the characteristics shown in Table 2.

table 2 Name of characteristic Value / Name Type of CO ₂ Emitter Parameters 10.25.30 watts Focus Point Diameter 0.075 mm Diameter of focus point through optics 0.025 mm

Installation for creating a embossed surface on a cut part (see Fig. 1) includes a radiation source 1, a focusing device, including a movable holder 2, a set of optical converters 3 mounted on it, and a mechanism 4 that provides a change of the converters 3 while ensuring the alignment of the optical axis of the beam radiation with the optical axis of the Converter, the workpiece 5, table 6, the device 7 for moving the holder 2 and the control unit 8, including a computer.

Using the control unit 8 generate a radiation pulse. The radiation emerging from the source 1 passes through the converter 3 and creates the required graphic graphics on the surface of the workpiece 5. In this case, darkening of certain parts of the surface of the workpiece is darkened due to exposure to the skin matter of the skin with laser radiation. In the process of forming a relief surface, gaseous oxidation products are discharged using exhaust equipment.

The surface of the parts obtained is carefully monitored to identify areas with insufficiently clear relief surface. After processing, such shortcomings will always occur in connection with the gradient of the concentration of the gol substance, due to the unevenness of tanning, fatliquoring, filling and other technological operations for processing the skin.

Patches of skin with an insufficiently clear relief surface are treated with a pyrograph. For this procedure, a manual pyrograph can be used, including a pen with interchangeable tips.

Areas on the surface of the skin that have been thermally embossed using laser radiation and a pyrograph have a higher density and are less prone to aging due to environmental factors.

Next, a protective coating is applied to the entire surface of the heat-treated parts. As such a coating, a protective varnish for the skin can be used.

After the protective coating has dried, the obtained parts are used to form the finished product by stitching, gluing, etc.

When implementing the method of manufacturing leather products according to the second embodiment, the obtained parts are fixed on the table surface. Before thermal embossing, the front side of the parts is applied manually using charcoal or through carbon paper.

Next, thermal embossing of at least part of the surface of the parts is carried out with a pyrograph handle with a heated replaceable tip with the formation of a relief surface of the required clarity and depth. During processing, the tip of the pyrograph is changed to obtain a sharper or less clear stamping. With this treatment, the density of the workpiece is variable. The different shape of the tip provides such embossing and part characteristics.

Further, as in the implementation of the method according to the first embodiment, a protective coating is applied to the entire surface of the heat-treated parts. As such a coating, a protective varnish for the skin can be used. After the protective coating has dried, the obtained parts are used to form the finished product by stitching, gluing, etc.

Claims (2)

1. A method for the production of leather products, including marking, cutting out tanned combined leather made from cattle hides, fixing the obtained parts on the surface of the installation table with an optical quantum generator, thermal embossing of at least part of the surface of the parts with radiation with the formation of a relief surface , subsequent additional heat treatment of the obtained relief surface with a pyrograph, applying a protective coating to the parts and forming the product from the obtained details. 2. A method of manufacturing leather products, including marking, cutting out tanned combined leather made from cattle hides, fixing the obtained parts on the table surface, thermal embossing of at least part of the surface of the parts with a pyrograph handle with the formation of a relief surface and obtaining the process of thermal stamping of the density gradient, due to the simultaneous force applied to the pyrograph handle, different embossing depths and the use of at least two different of replaceable tips for the pyrographic handle, applying a protective coating to the parts and forming the product from the parts obtained.

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