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 .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 .There are also known methods of marking , 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 .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 .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.
FIELD: printed matter of special format.
SUBSTANCE: multi-layered article comprises the layer sensitive to the laser radiation, marking member, e.g., diffraction and/or holographic structure, reflecting layer, and print formed in the second layer and/or in the layer sensitive to the laser radiation. The layer sensitive to the laser radiation has markers that are made by means of laser radiation and precisely positioned with respect to the marking member.
EFFECT: enhanced reliability of protection.
27 cl, 40 dwg
FIELD: protective members for visual controlling of authenticity of printing product such as security papers, banknotes, identification cards.
SUBSTANCE: protective member is formed as color layer applied to substrate and having color-free portions produced by exposing color layer to laser radiation for forming of image detected by visual control. Substrate surface is provided with relief, said image being formed on at least one side of relief after exposing to laser radiation falling at predetermined angle to relief surface. Protected printing product is equipped with protective member for visual controlling of paper authenticity.
EFFECT: increased extent of protecting printing products due to creation of protective member more complicated for counterfeit and using optical variable image.
7 cl, 5 dwg
FIELD: technological processes.
SUBSTANCE: digital array of data is created, which defines graphical configuration of partial plating, at that, using digital array, trajectory of tool motion is calculated, as well as control data for tool control, at that tool and single- or multi-layer film carcass are moved in relation to each other in accordance with tool motion trajectory. Tool that is controlled according to control data provides partial discrete de-metalation of metal layer by means of application of wipe-off mask for partial masking of single- or multi-layer film carcass. Foresaid mask is applied by spraying. Single- or multi-layer film carcass is further dried, provided with metal layer, and metal layer is partially removed by flushing method in area of wipe-off mask.
EFFECT: efficiency from production point of view, possibility to apply coating on different surfaces and exclusion of thermal or mechanical effect onto surface.
13 cl, 16 dwg
FIELD: technological processes.
SUBSTANCE: invention may be used in systems of laser marking and engraving in industry, for artistic applications, for authentication and personification of items and documents. Method for application of raster image consists in the fact that image of original is introduced into computer, image is transformed into raster array of numbers, working element coordinates are changed, working element is put in action, and dots are applied with its help onto surface of item. Working element used is represented by laser radiation. At the same time test image is previously downloaded into computer, and this image is applied onto surface of test sample, produced result is assessed, and laser radiation properties are accordingly adjusted in compliance with it. Multistage filtration of raster array of numbers is carried out, afterwards image of original is marked onto item.
EFFECT: high quality of applied image, increased resource of equipment, higher speed of image application, and also expansion of field of materials suitable for application of images.
FIELD: printing industry.
SUBSTANCE: invention is related to security paper, in particular to banknote, having individual mark, which is applied at least once on face and reverse side of security paper. At least one of individual identifiers applied on face and reverse side of security paper is applied onto security paper by contactless method. Besides application of individual identifiers on face and reverse side of security paper is carried out by means of single-sided treatment of security paper.
EFFECT: high degree of security paper protection, with minimum production costs.
32 cl, 16 dwg
FIELD: machine building.
SUBSTANCE: invention refers to method of laser labelling surface of metal or its alloy and can be implemented in machine building, jewellery industry and medicine. The method consists in preliminary plotting a calibration curve of dependence of depth of marking surface of a sample of specified metal or its alloy by means of effect of specific power of radiation incoming on surface. By means of a computer there is generated a protective digital code, where specific depth of marking and specific power of laser radiation correspond to each digit. A mark visible by a naked eye is applied on the marked surface of metal or its alloy by means of laser radiation transferred along marked surface; this mark corresponds to alpha-numeric or graphical information. A protective digital code in form of sequence of recesses invisible to a naked eye is applied on the produced surface visible to a naked eye; this code is marked by laser radiation of specific power chosen from the said calibrating curve.
EFFECT: high level of protection and simplified process.
8 cl, 5 dwg, 1 tbl, 1 ex
FIELD: physics, optics.
SUBSTANCE: device for transferring an image onto a wooden base has apparatus for receiving and/or creating an image. At least one source of a laser beam. Apparatus for moving the laser beam with rotation and/or translational movement of the laser beam relative the said wooden base or vice versa - for moving the wooden base relative the laser beam, as well as for focusing the laser beam onto the said base. At least one module for regulating radiation power of the laser beam. At least one module for controlling the said movement and focusing apparatus. Apparatus for converting information of the said image into an instruction for the said at least one regulation module and the said at least one control module. The said at least one regulation module regulates radiation power of the laser beam by directly changing pumping of the active substance and/or changing operation of the modulator located in the resonator of the source of the laser beam.
EFFECT: solution enables reproduction of images on a wooden base with an irregular shape with high accuracy and speed of processing, as well as high depth of transfer within the base.
22 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: proposed method may be used for making inscriptions and symbols on various materials, for examples, on light guides, light boards operated at high levels of illumination. Prior to applying coat of background material, contrast coat is applied that features minimum light reflection factor. Processed surface is divided along two coordinates into elementary sites to displace laser beam over said sites. All area of said sites is divided into area of sign outline and sign body area. On evaporating coats by laser radiation, the number of elementary sites is reduced to zero to form multistage sign profile comprising, at least, one step produced in contrast coat. Body sign area is kept unchanged.
EFFECT: higher readability and accuracy of signs, preservation of initial colours of materials.
3 cl, 3 dwg
SUBSTANCE: preliminary construction of calibration curve of dependence of etching depth of specimen surface of the specified metal or its alloy on parameters of incident laser radiation to surface is performed at monotonic increase in specific power of laser radiation from value of 0.1 J/cm2·s to the value at which molten drops are formed on etched surface. Then, spatial control of laser beam scanning on surface of metal or its alloy is performed at least as per one coordinate. Simultaneously with translational movement of laser beam there performed is its rotation with radius R. Radius R and angular rotation speed of laser beam is chosen considering the cut width and radius of laser beam.
EFFECT: improvement of the method.
5 cl, 3 dwg, 1 ex
FIELD: printing industry.
SUBSTANCE: invention relates to a method of manufacturing a protection property for the protective element, counterfeit-proof paper or data medium. The method of manufacturing a protection property for the protective element comprising a substrate which has at least one through hole and at least one marking in accurate register with this hole. The substrate, at least in the area of the manufactured marking is equipped with a marking substance modifiable by laser. During the same technological operation by exposure of laser radiation at high laser power at least one through hole is made in the substrate. By exposure of laser radiation at lower laser power at the marking area the marking substance is modified and thus at least one marking is created in accurate register with the through hole.
EFFECT: proposed protection property enhances the counterfeit protection level of the protective element.
23 cl, 5 dwg