Method of laser marking

 

(57) Abstract:

Method of laser marking refers to laser application methods alphanumeric or graphic information on products laser marking. The method is to use a multilayer material for labels such properties of the layers, so that when forming a pattern using a selective laser beam with varying energy density of the laser radiation, connected to a modified layer, the laser beam alternately modified layers applications so as to form a visible image. As the modifying layers application processes can be layer-by-layer ablation, layer-by-layer cutting and thermochemical conversion. The pattern formed by the laser in different layers of the application can be integrated, and can be made in the form of independent images for each layer and the engraving on glass. Another difference is that the elements of the picture, obtained by laser action on the application at one and the other values of the energy density of the laser radiation to be connected to modifiable layer, form an independent drawings, information which is different from each other and drawing, Oba coated on its surface by the application (label), consisting of a paper or plastic substrate coated on its surface with a layer of contrast in relation to the substrate by ink, the laser beam when marking consistently: remove by laser ablation of a layer of paint, cuts through the substrate thoroughly and etches the surface of the product. It is possible that selectively remove the paint and substrate engrave the product label or through the refractory layer impinges on the heat-sensitive layer and thereby create a hidden picture. The method has been tested on an industrial enterprise. These features make it possible to improve the quality of marking, to help protect the product from unauthorized copying and information capacity marking. 2 C.p. f-crystals, 3 ill.

The invention relates to methods for creating drawings and symbols on the products, including labels that are used to protect products against unauthorized copying, and more particularly, to laser application methods alphanumeric or graphic information on products laser marking.

There is a method of marking the surface of an object using a laser beam, in which the surface of an object caused thermo - or photoreactive layer krasivoe substance. When exposed to the specified layer of the focused laser beam at a certain exposure these associated components react chemically to form, contrasting picture [1].

There is also known a method of applying identification marks on transparent materials, which consists in engraving laser beam recesses on the surface of the transparent material forming the scattering centers, creating a visible pattern [2].

There are also known methods of marking [3], in which the product is covered by two layers of matter, and the bottom layer has one color, and the top - another contrast to the first. When marking the product is scanned by a laser beam on the surface so that at a given radiation power of the laser beam is locally removed only the top layer of the coating, in accordance with the specified pattern. This forms a contrast resistant to external influences figure.

Known methods of marking products do not allow you to create a figure with a high degree of protection against unauthorized copying some features from other marking - laser methods, which allows using another method, such as mechanical engraving or mask eksponirovanie color picture, if the substrate is applied mnogosloinoe floor, with each layer has its own, different from the neighboring color and background color. By successive changes in the power of the laser beam to change the depth of the engraving, which allows you to selectively delete a specified number of layers and, thus, to form the elements of different colors [4].

There is a method of labeling products, providing the following operations: manufacturing applications, consisting of a multilayer material comprising at least two layers of marking applications by cutting out a moving laser beam configuration required for identification marking [5].

However, the existing method is also poorly protected from unauthorized copying other non-laser methods, such as the possible shape cutting pattern on the surface of the material conventional mechanical methods. In addition, the information provided in the multilayer material has one figure or contour and, thus, are not used full recording capabilities with greater information density.

The aim of the present invention is to improve the quality of marking degree of protection products the goal is achieved by in known fashion labels, including the formation of the application containing at least two layers adjacent to each other materials, strengthening of application to the substrate and selective impact on the application of the laser beam is controlled in accordance with the desired pattern power density of the laser beam in turn modifies the layers of material media applications and the substrate, forming elements of the image, while the power density of the laser beam is controlled so as to call in each layer and the substrate different physico-chemical reactions account for elements of the figure obtained by laser action on layers of applications and substrates at different values of power density, in the form of self-images that differ from each other and figure formed together.

In addition, when using glass and other absorbing laser radiation packaging or packaging with pasted on its surface application (label), consisting of a paper or plastic substrate coated on its surface with a layer of contrast in relation to the substrate of the ink, to perform marking lazernye layer, produces end-to-end sections of the application of engraving the surface of the substrate, produces end-to-end sections of the application, engraving the surface of the product.

Another difference is that in the application (label) enter the layer with a high optical density, high energy density modification and high conductivity and the adjacent heat-sensitive layer and then select a power density such that when scanning the surface of the application of the focused laser beam modification of the first layer is not happening, and in the adjacent heat-sensitive layer is formed figure, visible from the side of thermosensitive layer.

In Fig. 1 shows an example of the markings made on the application of temperature-sensitive top layer.

In Fig. 2 shows an example of performing marking, in which the image elements is formed as a single or as separate drawings.

In Fig. 3 shows a General view of the marked labels pasted on the product type glass bottles, printed on the label surface with a layer of paint.

Examples of ways of labelling: was marking applications (labels) 1 (Fig. 1), consisting of polymer-paper the cells deposited on the surface of the object 3. Surface labels were scanned with a beam of CO2laser company "Simrad USA, 30 watt, focused by an optical system into a spot size of 60 μm. In the initial state, the surface of the applique is white. To create a picture of the markings on thermosensitive layer is directed laser beam moving at a speed of 5 m/sec at a power of 30 watts. Thus there is a thermochemical reaction in the upper thermosensitive layer and forms a picture element 4 high density (1.5 l) and, thus, the image element. After forming the contrasting element of figure 4 the speed of the laser beam was reduced to approximately 0.5 m/sec. At this power, the laser beam removes thermosensitive layer and cuts through the substrate, forming a clearly visible marking element 5. When applying appliques on the product with other than a matte color, color, formation of two communication systems drawings - black on a white background and the color of the material is also on a white background.

In the General case, the images formed when the speed of movement of the beam 5 m/sec and at a speed of 0.5 m/sec can be different and partially overlapping. In Fig. 2 shows a view of such marking - black lines 6 depicts elements of the surface appliques formed line of high density, dashed lines 7 marked the marks formed at a low recording speed by the full-cutting applications 1 through. It is seen that educated so pictures are different kinds of information.

In the case of labeling (Fig. 3) on the label, 1 consisting of a paper substrate 8, a thickness of 0.1-0.3 mm, coated on its surface by the method of printing print colored layer 9, a thickness of 1-10 μm, pasted on the product 3, for example a glass bottle, a surface which absorbs radiation of CO2the laser. The marking is performed as follows. When the interaction of moving the laser beam at a speed of about 1 m /sec, 30 watt with the size of the laser beam in the zone marking about 60 μm, there is a process of ablation of the paint layer, and the layer in the interaction zone of the laser beam from the backing paper is removed, revealing the surface 10 of the substrate 8 (usually of bright colors). When using contrasting colors to the substrate color, such as black, a white picture element on a black background. Then the speed of motion of the beam is slowed down to a value sufficient to place the process of laser cutting of the substrate, up to about 0.5 m/sec and, therefore clicks oreset substrate, but etches the surface of the object (glass bottles), creating microglobuline 12 on the surface of the product 3. Thus, the figure marking consists of three basic components that have different views, the depth and physical properties, namely high-contrast elements 10, obtained by removing the paint layer from the substrate, the elements 11, are cut in the substrate and the elements, cut in the substrate, combined with engraving 12 on the product 3.

When marking applications, consisting of an upper heat-resistant layer with high heat conductivity, for example, coated titanium with a thickness of 5 μm and the lower thermosensitive layer, for example of polyester containing a temperature-sensitive component - stearate of zinc, when scanning it with a laser beam with the above parameters at a speed of 1 m/sec due to the good thermal conductivity of the upper titanium layer in Mylar composition is thermochemical reaction, the formation of elements with high density, which are not observed by layer coated with titanium, but visible from the reverse side.

The use of multi-level marking device significantly increases the protection of the product against unauthorized displacement of the drawings, formed in one and the other layers. In the proposed method, laser engraving, this happens automatically. In addition, to achieve the same drawings by marking in other ways - for example, thermosensitive material with the outer layer will need at least two different devices, namely thermal head, with the help of which you can put a picture on top of the punch with the second pattern, and a device for cutting holes curly method should allow to precisely match both images. When the size of the scanning beam of about 50 microns minimum size of the line on the heat-sensitive material can be increased to 10 μm. The same hole sizes can be obtained, and when the laser shape cutting. Currently we are not aware of the industrial method that allows you to create drawings in a multi-layer material with the above qualitative parameters. In the case of multilayer marking on the applications already fortified product, conventional methods of marking with cutting applications to material without damage to the product is extremely complex and are not competitive in performance with laser methods.

The planned series is almostly to 6 thousand bottles per hour. The effectiveness of protection products tested experimentally for example, Barnaul distillery (BLS).

Literature:

1. Pat. USA N 5608429, 32 In 031/00, publ. 4.03.1997.

2. Pat. USA N 3657085, B 01 G 001/01, publ. 18.03.1972.

3. Pat. USA N 5474627, 32 In 031/00, publ. 12.12.1997.

4. Pat. France N 2575114, 44 B C 1/22, publ. 27.06.1986.

5. Pat. USA N 5603796, 32 In 031/00, publ. 18.02.1997.

1. Method of laser marking products, including the formation of appliques adjacent to each other of at least two layers of materials and the impact on them of the laser beam with variable in accordance with the generated pattern marking power density of the laser beam, characterized in that the power density of the laser beam adjusted so as to cause separate layers of different physico-chemical reactions of recording information, and elements of a picture made with different values of power density of the laser beam, in the form of self-images that differ from each other and from the figure formed together.

2. The method according to p. 1, characterized in that the applications use the label for glass containers, consisting of bumaril substrate, as the laser beam in accordance with a given pattern sequentially locally removed by ablation of the layer of paint, scuff the surface layer of the substrate through and engrave the glass surface, forming the predetermined pattern.

3. The method according to p. 1, characterized in that the application to impose a layer of high optical density, high energy density modification and high conductivity and the adjacent heat-sensitive layer and then select a power density such that the modification of the first layer is not happening, and in the adjacent heat-sensitive layer is formed figure.

 

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