CS207240B1 - Method of treating the refuse from the leathers - Google Patents

Description

The invention relates to a method of processing leather waste, in particular uppers, by punching small-area parts.

When cutting out parts of leather, haberdashery, etc., a considerable amount of waste is generated, for example about 10% of the original area of leather, of high quality material. The waste thus produced has so far been treated by sorting by type, tanning method and color shade. Small parts, such as sub-rings for shoe uppers, parts for knitting of various decorative belts etc. are cut out from individual sorted groups of waste. The cut small parts are then perforated as needed and their peripheral cuts or perforated holes cut by hand with paint corresponding to color shade finishes. However, for mass production, the need for small-area parts is very high, requiring the same thickness and a precise color shade. If the punched small-surface parts do not have the same thickness, they are subsequently trimmed. However, sorting out a sufficient amount of waste of the same kind of leather, which has been tanned in the same way and has a uniform color shade, is in many cases difficult and sometimes impossible. For this reason, the required small-area parts are often cut out of whole leather. This procedure is, of course, technologically simple and operationally safe, but economically very disadvantageous. In addition, once the waste of the leather has been produced, it must then be disposed of in another, economically loss-making way, for example by incineration, which negatively affects the environment.

However, waste of uppers, haberdashery and the like, of course, also arises directly during their manufacture in the tannery. For example, even before the face color finish is formed, very rugged marginal portions are trimmed to allow for a perfect spread of the entire surface of the skin when the face colors and dressings are deposited. The cut off parts are then ground and processed in the production of special cardboard or artificial leather. Further, in the control of finished leather, in the tanneries, such leather or parts thereof, which have obvious facial defects due to defective facial skin structure, such as torn and grooved face, or due to improper processing such as folds and uneven colouration, . Such waste is then processed by punching out parts that are less demanding in appearance and used for lower priced products. All these methods of waste treatment are insufficiently used as a raw material of tanned leather.

These disadvantages are largely eliminated by the waste treatment method of the invention, which consists in splitting the die-cut parts to the same thickness and applying a face-color coating to the surface of the splintered side. The dyeing is simultaneously applied to the peripheral section of the die-cut and chipped part. The dyeing paint is simultaneously applied to the cuts of the holes perforated into the die-cut and chipped part.

The higher technical effect of the invention is that the separation of the cut small parts and the application of a coloring coat simplifies the separation of waste. It is sufficient to separate the waste only according to the type and manner of tanning the leather, thereby increasing the sorted quantities and allowing it to be processed in mass production. The dyeing coating can be applied very productively to the chipped side of small-sized parts using a simple device. Simultaneous application of the dyeing coating on perimeter and hole cuts eliminates laborious manual dyeing.

Examples of method implementation.

Example 1.

The waste of uppers of leather is sorted according to the type and method of tanning, and sub-rings for uppers of shoes are cut out from the corresponding sorted group. The punched sub - rings are cut on the reverse side to the same thickness as specified in the recipe

Claims (3)

SUBJECT Method for processing leather waste, in particular uppers, by punching small-surface parts, characterized in that the punched parts are chipped to the same thickness and a face color coating is applied to the surface of the chipped side. 2. The method of claim 1, wherein said pattern of shoes. Then a face coloring coat corresponding to the color shade of the entire upper of the shoe is applied to the surface of the split side. At the same time, the dyeing coating is also applied to the peripheral sections of the sub-rings. After the dye coating has dried, the sub-rings are ready for sewing on the shoe upper. Example 2. Parts for the manufacture of knitted belts are punched out of the corresponding group of waste sorted according to Example 1. The punched parts are cut to the same thickness from the reverse side and the decorative and interlocking holes are perforated. Then a face coloring coat is applied to the surface of the chipped side, the shade of which is determined by the regulation for the production of the type of knitted belts. The staining coat is also applied to the peripheral and perforated cuts. After the dye coating has dried, the parts are ready for belt weaving. Similarly, the waste already produced during the manufacture of leather in tanneries can also be treated by the process according to the invention. The invention can be used in the treatment of waste from uppers, haberdashery, and the like. BACKGROUND OF THE INVENTION The coloring coating is simultaneously applied to the peripheral section of the die cut and chipped part. Method according to claim 1, characterized in that the dyeing coating is simultaneously applied to the cuts of the holes perforated in the die cut and chipped part.