SK288960B6 - Method of colour relief stamping - Google Patents

Abstract

It is described a method of production of colour relief stamping where a material or semi-finished product (2) that is to be equipped with a stamped relief is fixed in a fixture and then it is inserted together with the fixture first into a machine performing a relief stamping operation and then into a machine performing a printing operation. Printing is performed into the stamped relief with high precision. Both machines are aligned with working coordinates in a system of coordinates that is defined by the fixture.

Description

Field of technology

The invention belongs to the field of technology related to the surface treatment of materials and semi-finished products by embossing.

Prior art

The method of engraving has been known for a long time. During embossing, the surface of the flexible material is modified, in which embossing is created on the surface. The embossing is performed using punches. The punches have punches formed on the underside, which are pushed into the given surface of the flexible material either by the action of increasing pressure on the punch or by an impact with the punch. The embossing can be carried out at normal temperature or at elevated temperature, whether material or punch, e.g. when embossed in the skin.

There is a so-called blind embossing, ie blind printing, in which a relief is created on the embossed surface, which retains the appearance of the original material into which the embossing was made, or ink embossing is known, where the stamp is provided with a layer of ink which is applied to the embossing on the material by pressure during embossing.

From the close state of the art represented by the document CZ 283220, e.g. known engraving of the skin and subsequent surface treatment of the leather surface with relief by means of a coating. Other known methods of applying paints or care products to the surface include printing, spraying, immersion in a bath, etc.

The disadvantages of blind embossing are that the resulting relief retains its original color appearance or altered appearance due to exposure to pressure caused by the die, either cold or at elevated temperatures. If the interest is to modify the relief, it requires additional human work, which must be precise, especially for small reliefs. The use of machines for automatic color treatment of relief graphics is problematic because the flexible materials into which it is embossed and the products made from them do not have constant and constant dimensions. At the same time, there is a requirement for the quality and properties of the colors used, so that the relief is not glued with paint, so that the paint does not peel off the embossed relief, etc., so adding the color to the relief created by blind printing is time and money expensive.

As far as embossing is concerned, this is machine-feasible because it combines embossing and coloring in a single production step, so that even though the flexible material does not have constant and constant dimensions, the paint is applied to the exact location in the embossing. The disadvantages of color embossing are that the hot stamping ink must have special properties, which increases its cost and then the production costs of the embossing. Another disadvantage is that the application of ink to the die is complicated, the ink tends to mix and run. When embossing small reliefs with many details, the colors may be blurred, the color may flow to the surrounding areas of the relief during embossing due to the inconsistent flexibility of the material and the like.

The object of the invention is to provide a method of color embossing which is suitable for machine creation of color reliefs of different sizes and different levels of detail with precise application of colors, which would use long-known methods of embossing and applying colors and combine them so that the procedures followed up and were compatible.

The essence of the invention

The stated problem is solved by creating a color embossing method according to the present invention.

The color embossing method is intended to create colored embossing on the surface of a material or semi-finished product.

The essence of the invention lies in the following working steps, in which the material or semi-finished product is first fixed in the jig for its placement in the system of coordinates defined by the jig. Fixing maintained during the process is a cornerstone of the invention, as the embossing is carried out in flexible materials that cannot be repeatedly fixed identically. At the same time, the material is placed in a system of coordinates, which allows you to accurately focus the print on the embossing. Then follows the determination of working coordinates in the system of coordinates according to the assignment of the excavation. The work coordinates serve to focus the work operations on the exact place in the implementation of color embossing according to the graphic model of embossing. Then it is the turn of the work steps, including setting the stamp of the embossing machine to the work coordinates and performing the embossing. After the embossing is performed, the print head of the machine performing printing on the work coordinates and printing for embossing on the material or on the semi-finished product is performed. In the last working step, the material or semi-finished product is removed from the preparation.

Since the embossing and printing machines are generally independent, in a preferred embodiment of the invention the color embossing includes a working step involving the transfer of the preparation from the embossing machine to the printing machine between the embossing and adjusting steps of the printing head of the printing machine. .

In another preferred embodiment of the color embossing invention, for the second and subsequent repetitions of the color embossing method, a work step comprising determining the work coordinates in the coordinate system according to the embossing assignment is omitted and the machines keep their settings according to the work coordinates from the previous work. In carrying out the invention of color embossing, it is advantageous if the working step is realized by UV LED printing technology. This technology is suitable for coloring embossing embossing, because it precisely applies the paint and cures it immediately.

The advantages of the invention include the possibility of color embossing, where the embossing of the embossing is dyed by a printing machine, and this brings a wide range of design options that can be offered to customers. The color is applied with high precision to embossing, which can have details for coloring in the order of hundreds of millimeters, while UV LED printing is able to print a photograph until blind. Achieving such precision in flexible materials has not yet been addressed.

Overview of figures in the drawings

The present invention will be further elucidated in the following figures, where FIG. 1 shows a view of a blank fixed in a jig.

Examples of embodiments of the invention

The specific embodiments of the invention described and illustrated are presented by way of illustration and not by way of limitation. Those skilled in the art will find or be able to provide, through routine experimentation, more or less equivalents to the specific embodiments of the invention described herein. These equivalents will also be included within the scope of the following claims.

In FIG. 1 shows the fixing of the blank 2 to the jig. The jig is formed by a body 1 having a rectangular floor plan and stops 3. The stops 3 are adjustable on the jig body 1 so that they can be adapted to materials or semi-finished products of different dimensions. The preparation is made e.g. of metal (steel, aluminum) or solid plastic.

An example of a semi-finished product 2 may be a diary with leather plates, which the client wishes to stamp. The graphic model of the mintage includes the inscription "Prague and the coat of arms of the capital city of Prague. The inscription should be painted black, while the coat of arms should match the color of the original. The embossing should be located in the lower right corner of the top of the diary plates.

To perform color embossing on the diary plates, the diary is first fixed to the body 1 of the jig by means of stops 2. By fixing the diary, it is placed in a system of coordinates. For example, the origin of the coordinate system may be located in the center of the body 1 of the device or in one of its corners. The fixation must be the only one for the whole sequence of work steps, because the leather plates are flexible and the second fixation can cause the diary to be compressed and shifted by a millimeter to the side, so that the print would not focus precisely on the embossing. Subsequently, the working coordinates of the place to which the excavation is to be made according to the excavation assignment are determined in the system of coordinates. The die of the embossing machine is set to the working coordinates, the jig is inserted into the embossing machine and the embossing itself is performed. The embossing machine may be from Printek, e.g. model SH 12.

Subsequently, the jig is transferred to a printing machine, the print head of which is adjusted according to the working coordinates, and printing is performed until the embossing is performed. The printing machine may be e.g. UV LED printer model UJF-6042 from Mimaki. UV LED printing is a printing method that is based on injecting droplets of ink with a volume of picoliters at high speed onto the printing surface. The paint is sensitive to UV radiation, which hardens it.

In the case of series production, the machines are left in the set state and are only supplied with new semi-finished products fixed in jigs.

Industrial applicability

The invention finds application, for example, in the production of promotional items and also in the production of handbags, belts and footwear.

Claims (3)

PATETNAL CLAIMS A method of color embossing for forming a colored embossing on the surface of a material or semi-finished product (2), characterized in that it comprises the following working steps: a) fixing the material or semi-finished product (2) in a jig for placement in a coordinate system defined by the jig; determination of 5 working coordinates in the system of coordinates according to the assignment of the embossing, c) setting the stamp of the machine performing embossing on the working coordinates, d) performing embossing to create embossing on the surface of the material or semi-finished product (2), e) setting the printhead of the machine performing embossing on working coordinates, f) printing for embossing on the material or semi-finished product (2) and g) removing the material or semi-finished product (2) from the preparation. Method according to claim 1, characterized in that working steps d) and e) comprise a working step comprising transferring the preparation from the embossing machine to the printing machine. Method according to Claim 1 or 2, characterized in that working step b) is omitted for the second and subsequent repetitions of the color embossing process, and the machines further retain the settings according to working steps c) and e). Method according to one of Claims 1 to 3, characterized in that working step f) is carried out using UV LED printing technology. 1 drawing