Printing plate and method of manufacture of this form

 

The invention relates to a printed form, used as a cliché for direct imprint of the image. The shape is a plate with at least one relief printing section for printing executed with the specified additional figure in the form of grooves for gravure and intended for applying to a paint or foil across its surface. The plate is made of copper, magnesium, zinc or steel, supplementary figure formed is obtained by etching to form grooves depth 81-600 microns with a wall surface of each of which in the area of the plane of the relief printing section is made perpendicular to the specified plane and the surface of the wall in the area of the bottom is made inclined in side lying opposite wall. The use of the invention provides an increase in the density of lines on the relief printing area of the shape and the sharpness of the boundary lines, which reduces the production cycle, increases productivity and saves paint and foil embossing. 2 S. and 3 C.p. f-crystals, 5 Il.

The invention relates to a printed form having at least one relief (letterpress) on the basis of it ink or foil across its surface, and method of manufacturing the etching of this form.

Known printing form, which is a plate with at least one relief printing section for printing executed with the specified additional figure in the form of grooves for gravure and intended for applying to a paint across its surface (RU patent 2113356, B 41 N 1/06, publ. 20.06.1998).

Known printing form is a technological solution that provides enough low consumption of expensive colorful raw materials and providing the ability to print, for example, securities that contain in addition to the dominant in the composition of the images, and also protective design in the form of fine lines or guilloche pattern (a grid of intersecting thin lines). The disadvantage of this form is that the cavities are engraved. Therefore, the resolution of the picture is determined by the maximum of 20 lines 1 see figure with a higher density of lines per 1 cm length cannot be performed by etching, since the deformation of the walls of adjacent spaced grooves due to the mechanical action of the cutter on the metal. In addition, after etching the form must be foreign ministries of security securities is unrepeatable is protective figure, which directly depends on the density of lines and clarity of their repetition on the sheet. When cutting grooves with a depth ranging from 20 to 80 μm due to the shape of the cutter walls of the grooves are inclined with a gathering in the area of the bottom, resulting in the printed border lines do not always have a bright and clear display.

This famous decision was made as a prototype for the inventive device.

From the same source of information is known a method of making printing plates, consisting in the transfer on the surface of a metal printing plate lines of the specified figure, the formation of lines and contour drawing, subsequent formation of grooves on the lines of the figure for gravure printing, and removing material on printed form outside contour. The disadvantage of this method is that the formation of the recesses, the technology of engraving. The decision on RU patent 2113356 also taken as a prototype for the proposed method.

The present invention is directed to the solution of the technical problem to increase the density of lines on the relief printing area by performing their etching and increase the clarity of the boundaries of these lines when printing on the sheet. Achievable technical result of the economic cycle, productivity and cost of expensive paint and foil for hot stamping.

This technical result for the device is achieved by the fact that in print form, which is a plate with at least one relief printing section for printing executed with the specified additional figure in the form of grooves for gravure and intended for applying to a paint or foil across its surface, the plate is made of copper, magnesium, zinc or steel, supplementary figure formed is obtained by etching to form grooves depth 81-600 microns with a wall surface of each of which in the area of the plane of the relief printing section is made perpendicular to the specified plane, and the surface of the wall in the area of the bottom is made inclined in side lying opposite wall, and the plate surface by a relief printing section has a height of 1000-1300 mm. When preparing a form for printing securities, it is advisable that at least part of the surface of the relief printing area contained a granular structure formed by pixels that are evenly distributed over the surface, when this is her least one relief printing area, on the surface of which is made by etching a pattern for gravure printing, and the plot made in plain site for typographic printing method.

This technical result for the method is achieved in that in the method of making printing plates, consisting in the transfer on the surface of a metal printing plate lines of the specified figure, the formation of lines and contour drawing, subsequent formation of grooves on the lines of the figure for gravure printing, and removing material on printed form outside contour, forming lines and contour drawing exercise are copied to the photosensitive layer of the printing form image, which then manifest in trichloroethylene brand "chemically pure" until the exposed surface of the decorative image, and perform etching to a depth of 81-600 μm for forming grooves, then carry out the closing protective solution of grooves corresponding to the line drawing for gravure printing, and produce etching to a depth of 1000-1300 μm for removing material on printed form outside contour of the figure to letterpress with the subsequent removal of the solvent resins formalparam photosensitive layer and what about the plot, when this etching is carried out with simultaneous constant speed rotation of the plate printed forms and variable speed rotation of the blades of the mixing solution for the etching, and for receiving grooves with vertical surfaces of the walls of the etching carried out during the first specified time at a speed in 480-530 rpm, and then at the speed of 380-430 rpm

These characteristics as for a method and device are essential and interrelated with the formation of a stable set of essential features, sufficient to obtain the desired technical result.

Etching as a technological process has long been known and its use is described, for example, in SU auth. St. 1071666, C 23 F 1/00, publ. 07.02.1984 (etching forms a high print of magnesium alloys), SU auth. St. 381232, C 23 F 1/00, publ. 31.07.1973 (etching printing plates of alloys of iron and magnesium). In this invention the application of known methods of etching to produce the result, not directly resulting from these methods, as, for example, etched grooves with a given profile of the recesses for receiving the impression of high quality and definition, enables to obtain the desired the NGOs possible but clearly demonstrates the possibility of achieving a given set of features required technical result.

In Fig.1 - General view of the printing form; Fig. 2 - section a-a in Fig.1 shows schematically a section of the printing form, in which the dimensions of the various reliefs specially enlarged for clarity; Fig.3 is a partial top view of this printed form; Fig.4 - the section of the printing form a mixed structure with a plot corresponding to the printed form in Fig.1, and another section for printing on the printing method of Fig.5 - profiles of the grooves.

According to the present invention of the printing form (Fig. 1) is a plate with at least one relief printing section for printing executed with the specified additional figure in the form of grooves for gravure and intended for applying to a paint or foil across its surface.

The plate is made of copper, magnesium, zinc or steel. If the plate surface by a relief printing area having a height of 1000-1300 μm, made of steel, it may be covered with a sputtered layer of metal from the group titanium.

Additional pattern formed of the received Petroskoi relief printing section is made perpendicular to the specified plane, and the surface of the wall in the area of the bottom is made inclined in side lying opposite wall.

According to the invention at least part of the surface relief of the printing area may have a granular structure formed by pixels that are evenly distributed over the surface, while depression granular structures have a depth 31-40 microns.

According to the invention form may contain at least one relief printing area on the surface of which is made by etching a pattern for gravure printing, and the plot made in plain site for typographic printing method.

Below is an example of a specific execution of the printing form.

The section of the printing form 1 (Fig.2, 3) contains two relief part 2, surface 3 which is the print. This printing surface 3 is provided etched a pattern of grooves 4, as on the printed form for gravure printing. As shown in Fig. 3, this etched pattern is a star in the grid, and it is printed on a sheet of paper in a printed pattern formed by the relief of the paint or foil.

To increase the degree of protection, with the help of this figure can tatianapregnancy pixels, as shown in the right part of Fig.2. The bottom 6 of the groove 4 can also have a grid of lines - linear raster.

The height of the relief section 2 can vary from 1000 to 1300 μm. Recesses between the grains of the granular structure can have a depth of 31-40 μm, and the grooves 4 of the etched pattern deeper than the spaces between grains of a granular structure, and their depth can reach 81 - 600 μm. Of course, the depth of the grooves should be greater than the depth of the depressions between the grains of a granular structure.

The paint on this printing form is carried out uniformly over the entire surface of traditional colorful roller, which is used when printing printing method, or this roller, which is used to paint on the matrix with the method of gravure printing, the matrix roller so that the entire surface 3 of the printing area with patterns in relief (letterpress) was covered with paint and grooves etched pattern (gravure) would be well filled with ink or foil, but without subsequent removal of excess paint or foil. The thickness of the paint or foil to print parts for high print may vary, preferably in the range from 8 to 40 μm.

As shown in Fig.4, may taxrelief), the print surface 3 of which is provided with grooves 4, forming an etched pattern (gravure), and area 8 corresponding printed form for ordinary commercial printing multiple relief printing areas with smooth surface. In this case, zone 7 is applied to the ink for printing or foil, for example, changing colour in certain light conditions, and area 8 - ordinary printing ink, in both cases without removal of excess paint or foil.

Thus, get the printed form, with which you can easily print multiple protective drawings, distributed across the field of printed securities containing protective background and main image.

In the preferred use of optically variable ink effect documnet across the printing surface is enhanced due to the fact that the granular structure and accordingly the grid-raster also have reflective facette different orientations, giving the impression of different colors.

This granular structure in the form of a linear screen can also be provided at the bottom of the grooves forming the engraved pattern on the printed form, regardless of whether the print Pianosa on the surface of a metal printing plate lines of the specified figure, the formation of lines and contour drawing, subsequent formation of grooves on the lines of the figure for gravure printing, and removing material on printed form outside contour.

The formation of lines and contour drawing exercise are copied to the photosensitive layer of the printing form image, which then manifest in trichloroethylene brand "chemically pure" until the exposed surface of the decorative image, and perform etching to a depth of 81-600 μm for forming grooves. When using etching technology it is possible to achieve up to 70 lines 1 cm and above, resulting in the formation of a dense protective bitmap mask, it is difficult faked.

Then carry out the painting Ratushny varnish grooves corresponding to the line drawing for gravure printing, and produce etching to a depth of 1000-1300 μm for removing material on printed form outside contour of the figure to letterpress with the subsequent removal of the solvent resins formalparam photosensitive layer. There is also the possibility of deposition of the protective layer of metal from the group titanium on the surface of the mold by a relief printing area, if it is made of steel.

If this is nom speed rotation of the blades of the mixing solution for etching, moreover, for receiving grooves with vertical surfaces of the walls of the etching carried out during the first specified time at a speed in 480-530 rpm, and then at the speed of 380-430 rpm

Below is an example of a specific implementation of this method.

Manufacturing process of direct blocks high and gravure printing begins with the fact that using film Assembly (negative or positive), the image is copied to the photosensitive layer of the magnesium plate under UV lamps for a given exposure time. Then carry out the demonstration in the solution developer (trichloroethylene brand "chemically pure") until a brilliant image on the exposed surface of the plate. After pre-seed image in 7% nitric acid by means of a brush carry out etching in the etching machine when the temperature of the solution 34-38oWith the calculation that 1 min time of etching is provided by the profile depth equal to 0.18 micron.

The etching is carried out in a pickling machine, providing the speed platinumgames 8-10 rpm, and the rotational speed of the blades of the machine 380 rpm for paper and cardboard, 430-450 rpm for the skin. After the etching of small elements (labels, coats of arms, medals) is proposed to carry out etching with variable speeds: the first 2 min, the speed of movement of the blades etching apparatus is increased to 100 rpm (i.e., the speed of the blades reach 480 or 530 rpm) during the subsequent time of etching speed of movement of blades are 380 or 430 rpm In the profiles of the grooves have the form shown in Fig.5. It gives the effect of a good propiedade foil small and close to each other printing elements.

As a material for the manufacture of embossing stamp using the negative type image with a white line that provides the contour of the foil. After kopirovni under ultraviolet lamps within a specified time, the image appears in the developer trichloroethylene brand "chemically pure".

Then comes the typical technological process of etching to a depth of 0,81-0.6 mm for receiving grooves picture for gravure printing.

After etching, the process of closing elements convex embossing protective solution, for example Ratushny varnish.

Then, the second step of etching to deepen the gap elements to a depth of 1-1 .2 mm

Thus, the introduction of multi-stage the cliche) stamps with high quality stamping, reduction of production cycle and save the expensive foil for hot stamping.

Claims

1. Printing form, which is a plate with at least one relief printing section for printing executed with the specified additional figure in the form of grooves for gravure printing and designed for applying to a paint or foil across its surface, characterized in that the plate is made of copper, magnesium, zinc or steel, supplementary figure formed is obtained by etching to form grooves depth 81-600 microns with a wall surface of each of which in the area of the plane of the relief printing section is made perpendicular to the specified plane, and the surface of the wall in the area of the bottom is made inclined in side lying opposite wall, and the plate surface by a relief printing section has a height of 1000-1300 mm.

2. Form p. 1, characterized in that at least part of the surface of the relief printing section contains a granular structure formed by pixels that are evenly distributed over the surface, while depression granular structures have a depth of the drain, on the surface of which is made by etching a pattern for gravure printing, and the plot made in plain site for typographic printing method.

4. Form p. 1, characterized in that the surface of the steel plate by a relief printing area having a height of 1000-1300 μm, covered with a sputtered layer of metal from the group titanium.

5. Method of making printing plates, consisting in the transfer on the surface of a metal printing plate lines of the specified figure, the formation of lines and contour drawing, subsequent formation of grooves on the lines of the figure for gravure printing, and removing material on printed form outside contour, characterized in that the formation of lines and contour drawing exercise are copied to the photosensitive layer of the printing form image, which then manifest in trichloroethylene brand "chemically pure" until the exposed surface of the decorative image, and perform etching to a depth of 81-600 μm for the formation of the grooves, and then carry out the closing of the protective mortar grooves, the relevant lines for gravure printing, and produce etching to a depth of 1000-1300 microns for removal of material on peacham the photosensitive layer, when this etching is carried out with simultaneous constant speed rotation of the plate printed forms and variable speed rotation of the blades of the mixing solution for the etching, and for receiving grooves with vertical surfaces of the walls of the etching carried out during the first specified time at a speed in 480-530 rpm, and then at the speed of 380-430 rpm

 

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