Method of making printing plates for offset printing

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.

4 cl

 

The invention relates to the field of printing, in particular to the manufacture of printing forms for offset printing.

A method for manufacturing offset printing form direct laser writing method for pre-chuvstvennyh plate plates with copy layer from a composition based on ordinationleading, which carry WITH2a laser with a wavelength of 1.06 μm using the method of linear scan when the power of the recording beam, 5 watts, and the linear velocity of 1.5 m/s, followed by exposure of the copy layer for 3-5 min metal halide lamps with subsequent manifestation of copies, its hydrophilization, reprisal and the coating forms a protective solution (USSR Author's certificate SU 1419921, CL. B41C 1/10).

The disadvantage of this method is the complexity of the technological process and the use of chemical solutions.

The closest to the claimed is a method of manufacturing an offset printing plate, is accomplished by changing the properties of wettability areas of the working surface of the printing forms, and the conversion of properties carried out by changing the chemical composition of the working surface with a thickness of 5-200 nm made of silicon nitride, aluminum nitride, silicon carbide by exposing selected areas of the flow accelerated part� with energies from 100 eV to 5 Kev (EN 2353528, C1).

The disadvantage of this method is the need to use the template (under), which is made with additional equipment.

The object of the invention is to simplify and cheapen the method of making printing plates for offset printing.

This result is achieved in that a method of manufacturing a printing form for offset printing occurs due to changes in the properties of wettability of areas of a printed circuit elements on the anodic oxide surface of the substrate, according to the proposed technical solution, the transformation properties of wettability plots of anodic oxide surface of the substrate is performed by applying a hydrophobic coating thickness δ inkjet printing device. Furthermore, the hydrophobic coating is applied to the substrate by any known printing devices with the possibility of applying inkjet printing of UV curable photopolymerization paints (hereinafter UV paint), and pinning photopolymerized paints (hereinafter photopolymerization) by ultraviolet UV radiation. It was established experimentally that for optimum fastening of the printing elements on the substrate with the anodic oxide layer is required, the radiation source having a wavelength of from 250 to 380 nm and haibara�encourages creativity with a capacity from 10 to 160 W/m, irradiated for a short period of time, installed print. Also required printhead with a resolution of 50 to 200 dots per cm and volume drops formed from PCL 6 to 42, which ensures the optimum quality of printing elements.

The process of forming printed elements takes place in two stages with a minimum interval of time: the application of inkjet printing UV inks and photopolymerization. Obtained, thus, the printing plates do not require the creation of a template (under) and ready to eat without showing or any further processing.

The most appropriate blank printed forms to copy and use without the pigment layer. This allows the use of cheaper substrate materials of construction. Also it has been experimentally found that the most suitable paint for inkjet printing hydrophobic coating in the quality of the printing elements is UV ink. It provides sufficient period of operation of the manufactured offset forms, because it has high durability. Specified hydrophobic coating allows the use of offset forms without existence. As has been established experimentally, as a source of radiation for photo-polymerization of UV inks can be used for led ceiling lamp with LON�s and mercury-containing lamps (DRT and DRL).

Consider a specific example of a method of manufacturing a printing form for offset printing.

The substrate with the anodic oxide layer with a thickness of 0.15 is placed in an inkjet printing device that is connected to the computer. The printing device comprises an inkjet head, which can print UV paint. Inkjet head causing UV paint with a resolution of 100 dots per cm from the anodic oxide layer of the substrate on plots established in the computer program, which will be printed elements. With a minimum time interval, mounted print, after the application of UV inks, substrate, from the side of the anodic oxide layer and the applied UV ink is irradiated by a source of ultraviolet radiation with a wavelength of 380 nm, power density of 120 W/cm Under the action of ultraviolet radiation UV paint is fixed on the anodic oxide layer, forming a hydrophobic layer thickness δ, which is printed elements. The rate of production of printing forms for offset printing is 8 sq m/h.

Thus, the proposed method in comparison with known eliminates the use of mechanicals and additional equipment, which simplifies the manufacturing process and saves production space.

1. A method of manufacturing a printing form for offset printing by changing the properties of wettability of the plots, the performance�ing a printed circuit elements, on anodic oxide surface of the substrate, characterized in that the transformation properties of wettability plots of anodic oxide surface of the substrate is performed by applying a hydrophobic coating inkjet printing device.

2. A method according to claim 1, characterized in that the hydrophobic coating is applied to the ultraviolet curable photopolymerization colors.

3. A method according to claim 1, characterized in that as material for hydrophobic coatings using ultraviolet curable photopolymerizable paint.

4. A method according to claim 1, characterized in that the photopolymerization of the ultraviolet-curable photopolymerizable paint is carried out with ultraviolet UV radiation.



 

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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.

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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.

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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: 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: 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.

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