Method of making printing plates
The invention relates to means for printing, in particular, to methods for producing printing forms for high quality printing. A method of manufacturing a printing form is carried out by a uniform coverage of the substrate with the liquid material ejection of two given points of a layer of this material drops under the action of svetogidravlichesky effect caused by the laser radiation pulses. On the place of the emitted droplets are formed craters, which are arranged on the substrate. Fix thus obtained relief from UV radiation. The technical result from the use of the method is the removal of the complex and costly processing of the substrate of the printing form and purification of liquid material between the grooves on its surface before curing of the material. 4 C.p. f-crystals, 2 Il. Technical field the Present invention relates to a means for printing. More specifically the invention relates to methods for producing printing forms for high quality printing.Prior art Known method of making printing plates, consisting in applying to the substrate a liquid material hardened under the influence of svetem pulses of laser radiation and the emission of these points drops of liquid material to obtain on the substrate is subjected to the reproduction of images (RF patent 2088410, 41 F 9/02). In the known method, the liquid material is placed in a multitude of recesses located on the substrate in the form of intersecting parallel rows, with adjacent recesses is placed between them with a step corresponding to a given resolution subject to reproduction of the image.The disadvantage of this method is the difficulty of manufacturing the substrate, it is necessary to remove the liquid material from all periods between the pits before the processing pulse laser radiation and subsequent curing.Disclosure of the invention the basis of the invention is to create such a method of manufacturing a printed form, which would eliminate the need for complex and expensive processing of the substrate and the cleaning liquid material between the grooves on its surface before curing of the material.The problem is solved in that in the method of making printing plates, consisting in applying to the substrate a liquid printing material hardened under the influence of light radiation, the excitation at the given points of this material svetogidravlichesky effects of pulses laser is proizvodstvu image, in accordance with the invention, the entire surface of the substrate uniformly coated with liquid material, cause svetogidravlichesky effect at specified points in the fluid layer, directly adjacent to the substrate, and fix a thin layer-side surface of the crater formed at the departure of every drop of liquid.With this method of manufacturing a printed form eliminates the need for special surface preparation of the substrate and removal of excess material outside of the points that make possible the emission of droplets of the material.It is advisable that a thin layer-side surface of the crater formed by the radius of a droplet with the substrate, temporarily fix due to the energy released in its basis upon the occurrence svetogidravlichesky effect.In addition, a thin layer-side surface of the crater is fixed to a depth sufficient to exclude the wicking material formed at the departure drop of the crater.It is also advisable that a thin layer-side surface of the crater form a film, the thickness of which exceedsIn addition, during the formation of the crater adjacent to the existing vapor separating the film at the expense of energy, videosmy to eliminate wicking of liquid material on the formed space form elements, without additional sources of energy.It is advisable that a thin layer-side surface of the crater is fixed to a depth that allows you to vaporize the formed film when creating adjacent crater due to the energy dissipated in the base of the new crater.This embodiment of the method, without resorting to additional sources of energy in order to expand the area of the gap elements of the printing form.Brief description of drawings the invention is further illustrated by description of a specific, but not limiting the present invention to the embodiments and the attached drawings, in which: Fig.1 illustrates the proposed method of printing; Fig.2 - section I-I in Fig.1.The best embodiments of the invention Offer a method of manufacturing a printing form is as follows.On the plate cylinder 1 of a printing machine (not shown) fixed to the substrate 2, e.g. made from aluminium sheet. During the rotation of the cylinder 1 is applied on a substrate a thin layer of liquid material 3, is capable of hardening under the influence of light radiation. Then a pulse of focused laser radiation quantum generator 4 for a given program the pic is ICOI, svetogidravlichesky effect. Under the action of svetogidravlichesky effect is boiling material in a small volume of liquid in a layer thickness of 0.5-1.0 μm, directly adjacent to the substrate 2. In the boiling liquid will cause tremendous pressure, up to hundreds of atmospheres, causing an explosive kick in above the fluid layer, reinforced by reflection of acoustic waves from the substrate.The duration of the laser pulse, which occurs svetogidravlichesky effect in small volumes of liquid and emits cold drops, lies in the range from 2 to 100 NS.Under each action arising pulse pressure of the liquid layer takes off cold drop, forming a crater 5, the side walls of which is fixed a thin film formed at the expense of the energy deposited in the bottom of the crater occurs when svetogidravlichesky effect.During the formation of the crater adjacent to existing, due to the energy released in its base, dividing both crater film will evaporate, thereby expanding the area of the spacing element.The relief on the substrate permanently fixed by curing the liquid material under deny.Industrial applicability the Method of manufacturing the printing plate is designed to print a variety of products, including artistic.
1. Method of making printing plates, consisting in applying to the substrate a liquid material hardened under the influence of light radiation, the excitation at the given points of this material svetogidravlichesky effects of pulses of laser radiation and the emission of these points drops of liquid material to obtain on the substrate is subjected to the reproduction of images, characterized in that the entire surface of the substrate uniformly coated with liquid material, cause svetogidravlichesky effect at specified points in the fluid layer, directly adjacent to the substrate, and fix a thin layer-side surface of the crater formed at the departure of every drop of liquid.2. The method according to p. 1, characterized in that the thin layer-side surface of the crater fix when departing from it drops due to the energy deposited in the bottom of the crater occurs when svetogidravlichesky effect.3. The method according to one of paragraphs. 1 and 2, characterized in that a thin layer side is different at the departure drop of the crater.4. The method according to one of paragraphs. 1-3, characterized in that the thin layer-side surface of the crater formed by the film thickness is not
5. The method according to one of paragraphs. 1-4, characterized in that during the formation of the crater adjacent to the existing vapor separating film due to the energy emitted at the base of the resulting crater.
FIELD: multicolor printing methods.
SUBSTANCE: method involves transferring positive image formed on film onto carbon-treated microporous rubber; dividing portion of microporous rubber of, for example, round shape, which had not been subjected to pulsed light treatment, into n number of sectors of different shapes; creating boundaries between sectors by exposing microporous rubber to thermal action of maximal depth. With 1.5 mm thick rubber, depth of boundary shall be at least 1.1 mm and shall not exceed 1.4 mm, said depth preferably approximating to thickness of rubber. Upon subjecting rubber to thermal action, pores are caked to define boundary, which protects sectors from mixing of inks of different colors. Resultant sectors are further charged with inks of different colors.
EFFECT: provision for creating of high-quality multicolor print.
FIELD: processes and equipment for making printing forms for screen printing, apparatuses for screen printing.
SUBSTANCE: method for making printing forms comprises steps of melting heat sensitive material of printing forms for screen printing having film of thermosetting resin of predetermined thickness by heating thermal head for perforating holes permeable for printing ink; forming large number of shallow recesses in one side of said film. Heaters of thermal head 10 have such size that next inequalities HM > 0.6PM, HS > 0.7 PS are satisfied. Heaters are arranged at pitch PM in side of main scanning direction. Length of heaters along side of main scanning direction is equal to HM. Feed stroke at side along secondary direction of scanning is equal to PS. Length of heaters at side along secondary direction of scanning is equal to HS. Side of film opposite to its side having shallow recesses is heated due to heating thermal head 10 with output 35 mJ/mm2 or less for melting heated zone until its communication with said recesses in order to form holes permeable for printing ink.
EFFECT: possibility for thermally perforating in film individual holes permeable for typographic ink at the same output of thermal head, realization of screen printing process at using material of printing forms for screen printing containing only film of thermoplastic resin.
18 cl, 9 dwg
FIELD: manufacture of plates used for intaglio printing.
SUBSTANCE: method for making engraved plate with use of tool such as laser beam comprises steps of using engraving tool operating with use of data of depth card formed on base of three-dimensional raster image of printed document; similarly making intermediate engraved plates.
EFFECT: shortened time period for engraving high-quality plates, prevention of warping of plates at printing process.
21 cl, 15 dwg
SUBSTANCE: invention pertains to a printing matrix engraved by a laser, used for obtaining a relief image using known methods. Description is given of the printing matrix engraved by a laser, obtained through photocuring a compound on a photosensitive resin base (a), consisting of a polymerised unsaturated group and which has an average molecular mass between 1000 to 20 x 104, an organic compound (b), with a polymerised unsaturated group and average molecular mass less than 1000 and an organic silicon compound (c), with at least, one Si-O bond and not containing a polymerised unsaturated group. Content of the organic silicon compound (c), lies in the range from 0.1 to 10 % of the mass of the compound on the photosensitive resin base. Description is given of obtaining the printing matrix engraved by a laser, through formation of the given compound on a canvas or cylinder with subsequent linking and solidification under exposure to light.
EFFECT: increased resistance of the printing matrix to abrasion and to adhesion on its surface.
19 cl, 2 tbl, 12 ex
FIELD: technological processes.
SUBSTANCE: in method of flexographic plates production by direct laser engraving, gaseous decomposition products or products made of separate particles (7) generated in the process of engraving are caught with the help of suction device (4) and exhausted gas flow saturated with decomposition products is purified with the help of combination of filter (5) with solid filtering material and filter (6) with buffer unit and oxidising stage.
EFFECT: increases efficiency of gases purification.
8 cl, 6 dwg
FIELD: printing industry.
SUBSTANCE: method of manufacturing offset plates by changing the wetting properties of parts of the working surface of the plates, transformation of the properties is carried out by changing the chemical composition of the working surfaces, made from silicon nitride, aluminium nitride and silicon carbide by acting on the selected parts with a stream of accelerated particles.
EFFECT: possibility to simplify and accelerate the process of manufacture, increase resolution and durability of the plates.
7 cl, 1 dwg
FIELD: process engineering.
SUBSTANCE: proposed method of producing plate for intaglio printing consists in programmed engraving of the plate made by computer-aided engraving tool. Artwork depth pattern is produced for, at least, a portion of bonds. Note here that said pattern comprises data on 3D elements with data on engraving depth in said plate. Artwork reference depth pattern is produced for plate to be engraved. Note here that said pattern consists of assemblage of repetitions on said artwork pattern complying with that of lines and columns and comprises data on position of said repetitions in the plate plane. Then, plate is engraved to comply with produced reference depth pattern.
EFFECT: higher quality of plates, reduced production time and costs.
9 cl, 15 dwg
FIELD: printing industry.
SUBSTANCE: invention relates to a method and device for manufacturing moulds for engraved printing, intended for production of security papers, which uses a laser beam (2) for engraving pattern (3, 3.1, 3.2, 3.3) of engraved printing directly on the surface of the moulding material (1), in particular metal, made with the ability of laser engraving. Laser engraving of the moulding material (1) is carried out in layers in several separate stages of engraving. The stages are carried out one after another with the absolute register so that the pattern (3, 3.1, 3.2, 3.3) of engraved printing is gradually engraved on the surface of the moulding material (1) to the required depth of engraving. The surface of the engraved moulding material (1) is cleaned from wastes of a process of laser engraving after each separate stage of engraving, while the laser engraving unit is in the inoperative state.
EFFECT: improvement of quality of engraving.
24 cl, 10 dwg
FIELD: printing industry.
SUBSTANCE: properties of wettability of areas are changed, which are printed elements on the anodic-oxide surface of the substrate. Transforming of properties of wettability of areas of the anodic-oxide surface of the substrate is performed by applying the hydrophobic coating by jet printing device.
EFFECT: method eliminates the use of templates and additional equipment, which simplifies the process of production of printing plates.
FIELD: technological processes.
SUBSTANCE: invention relates to field of laser processing and can be used for contoured surface formation on steel embossing shaft. Contoured surface formation represents making of macrorelief with elements dimensions of more than 20 mcm and depths of up to 150 mcm inclusively, by laser exposure with following parameters: energy density in single pulses generation mode is equal to 0.5–3.5 J/cm2, average density of energy in pulses packs generation mode is equal to 0.5–70 J/cm2 per pulse, wave length is 532–1,064 nm, pulse repetition frequency is from 1 kHz to 10 MHz, distance between pulses on part is 10–50 % of beam diameter for femtosecond laser and 10–25 % or 40–50 % of beam diameter for picosecond laser, laser beam focal plane is located on part surface, and beam travel speed is equal to or more than 100 m/s.
EFFECT: use of invention enables to increase preset relief on embossing shaft production precision.
9 cl, 3 dwg