The method of manufacture of offset printing plates on triacetylcellulose film
(57) Abstract:Use: in the production of offset honorary plates. The inventive triacetylcellulose film is chemically processed and put a sublayer of water-soluble polymers with a thickness of 2 to 6 μm. As the polymer used polyvinyl alcohol and polivinilpirolidon at a ratio, respectively, 8.0 to 9.5 : 0.5 - 2.0 wt. PM or polyvinyl alcohol and hydroquinone at a ratio of 1:2-4 wt. hours Then put on film photosensitive layer on the basis of diazoma. The invention relates to the printing industry and can be used for the production of offset printing plates.A known method of manufacturing a photomechanical printing plates, which uses film materials obtained in a known manner. A disadvantage of the known method of producing thin film materials, in particular, on triacetylcellulose basis, is the fact that a film material obtained by a known method cannot be used for offset printing plates and more plates.The closest analogue is a method of manufacturing plates on triacetylcellulose the Tr caustic potash) for 1.5-2.0 hours, followed by the application on the hydrophilic surface triacetate film photosensitive layer on the basis of diazoma. The length of the forms obtained in a known manner, only 2-3 thousand impressions. The disadvantage of this method is the fact that the plates produced according to this method, and then the printing plate is exposed and propodosoma surface contamination offset layer. The technical result of the proposed method is the elimination of these disadvantages.This technical result is achieved in that in the method of manufacturing festou plate on triacetylcellulose the film, including chemical processing of the film and application of a photosensitive layer on the basis of diazoma, according to the invention, before application of the photosensitive layer on the surface of the film in addition put a sublayer of water-soluble polymers are polyvinyl alcohol and polyvinylpyrolidone at a ratio respectively of 9.0 to 9.5: 0.5 to 2.0 wt. h or polyvinyl alcohol and hydroquinone at a ratio of 1:2-4 wt. including a thickness of 2 to 6 microns.The method is as follows.Example 1. Before applying the light is the third film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio 8:2 by weight. PM or polyvinyl alcohol and hydroquinone in the ratio of 1:2 by weight. including the thickness of 2 μm.Example 2. Before application of the photosensitive layer on the basis of diazoma on the surface of the pretreated triacetylcellulose film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio of 9:1 by weight. PM or polyvinyl alcohol and hydroquinone in the ratio of 1:3 by weight. PM 4 µm thick.Example 3. Before application of the photosensitive layer on the basis of diazoma on the surface of the pretreated triacetylcellulose film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio of 9.5:0.5. including thickness of 6 μm. The method of manufacture of offset printing plates on triacetylcellulose films, including chemical processing of the film and application of a photosensitive layer on the basis of diazoma, characterized in that before applying the photosensitive layer on the surface of the film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in a ratio, respectively 8,0 9,5 0.5 to 2.0 wt
FIELD: data carriers.
SUBSTANCE: data carrier 14 with forgery-protecting imprint 1 made by metallographic printing method consists of several contrasting structural elements 2,3,4,5,7,22, positioned with precise alignment to each other, while one portion of these structural elements 3,4,5,7 is made relief-type and can be sensed by touch, and other portion of structural element 2, 22 is made flat and undetectable by touch.
EFFECT: exceptionally high level of protection.
4 cl, 9 dwg
FIELD: metal working in number program controlled machines.
SUBSTANCE: cutter includes active portion and stem. Cutter apex is arranged in its axis belonging to front surface. Main and trailing back faces are equally inclined relative to cutter axis and they cross front surface by positive back angles relative to main and trailing cutting edges having their own angles in plan view. Trailing back surfaces form second pair of surfaces inclined by the same angles relative to cutter axis. Inclination angles of main and trailing back surfaces relative to cutter axis is determined by value of back angle of main cutting edge. Trailing back surfaces are inclined by less angles relative to cutter axis. Active portion of cutter has at least with two chamfers equally inclined relative to cutter axis.
EFFECT: enhanced strength of cutter, improved stability of manufacturing process.
5 cl, 19 dwg
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: printing industry.
SUBSTANCE: proposed storage medium with half-tone image in engraving style produced by method of intaglio printing, i.e. presented by irregular linear structures, consists of repeated printable structural elements. Fine structure present within the limits of structural elements in from of spaces are partially applied to structural elements.
EFFECT: provision of complex design, high protection from counterfeit.
36 cl, 16 dwg
FIELD: polygraphy, in particular, template printing forms.
SUBSTANCE: template printing form has meshed base and photo-resistive parts, limiting printing elements. Meshed base consists of cells in form of scalene n-angled shapes of even areas, where n≥3, positioned irregularly. Lengths of links, forming sides of n-angled shapes, are selected from condition of evenness of areas of these.
EFFECT: increased printing quality due to prevented appearance of moire pattern, appearing because of interference between regular polygraphic dot matrix and meshed base.
FIELD: metallography, possible use for forming submicron relief structures in functional layers of metallographic forms.
SUBSTANCE: in accordance to method, by means of at least one technological transition sides 4,5,6,7 of profiled linear groove 8 of pattern fragment 3 are formed by means of shaping of functional layer of product 2. After full profile of groove 8 is formed, in internal corners of mating sections, at least parts of sections of curvilinear contour of groove 8 with different, relatively to base coordinates system, angular orientation, cold-hardening is removed which appeared during plastic deformation of material of functional layer during forming of profiled contour of groove 8. For that purpose in bisector area of aforementioned mating sections cuts 10 are made, directed towards area of groove 8 adjacent to bottom with exit of cutting part of tool onto upper plane of functional layer of product 2. Cuts 10 are made by shaping with length not exceeding size of side 4 or 5 of profile of groove 8 in direction of cut 10 in place where aforementioned cut 10 is made. Cut 10 is, as a rule, made during one pass of tool.
EFFECT: increased efficiency of process, increased precision and quality of processing due to elimination of cold-work strengthening.
3 cl, 4 dwg
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: micro- and(or) nano-technology.
SUBSTANCE: method comprises steps of removing allowance in central zone of working during rough pass and then finishing surfaces of lateral faces of shaped fragments of pattern along the whole depth of rough working pass. It is realized at using only one lateral edge of cutter to be rotated around its lengthwise axis in curvilinear and broken portions of its cutting path while providing optimal three-dimension position of front surface of cutter relative to cutting surface. Rough passes are performed by means of cutter while using in first pass simultaneously two lateral cutting edges and then using only one of said cutting edges turned to formed lateral face of shaped fragment of pattern. In order to enhance accuracy and quality of working by providing possibility of removing allowance in zones of pattern with broken cutting path during process of removing allowance remained after rough working at finishing, in zones of internal angles of broken portion of cutting path and in zone of portions with small joining radius cutter is lifted for providing outlet of its working part onto upper plane of functional layer of article. Then cutter is turned by angle normalized by cutting path going-on line and it is again fed-in to allowance portion remained after lifting cutter by initial depth. Cutter is lifted and descended while simultaneously imparting to it main cutting motion into zone of removed allowance. Planing cutter includes stem and working part restricted by flat front surface with lateral cutting edges and profiled back surface with lead angle equal to zero for forming end portion of working part. Cross section of working portion is in the form of axially symmetrical figure. Generatrices of back surface are inclined by the same angles relative to axis of cutter stem. End portion of working part is flat one and it is the form of oval-half whose plane is spatially inclined by acute angle relative to front surface. Rib formed by crossing of end portion and front surface serves functionally as third cutting edge; it is oriented by angle 90° relative to lengthwise axis of cutter.
EFFECT: improved accuracy and quality of planing by such cutter.
7 cl, 20 dwg