The method of producing monoblastic on steel base
(57) Abstract:Use: in the production of offset printing plates. The inventive surface of the steel plate is subjected to electrolytic degreasing. Then activate sequentially 5.0% solution of sulfuric acid and 0.2% solution of oxalic acid. Carry out electrochemical plating. Dried and put photosensitive layer. The invention relates to the printing industry, namely, the method of obtaining monometallic plates on the basis of carbon steel for offset printing.A known method of producing monoblastic for offset printing, comprising a steel strip degreasing, washing, electrochemical plating, rinsing, application of the copy layer and drying in a high-frequency electric field 
The disadvantage of this method is the use of a steel tape and a high-frequency electric field. The closest analogue is the way to get monoblastic for offset printing, comprising degreasing the steel plate in the alkali solution, the chromium in the electrolyte to the thickness of the chromium layer is 1.0 μm and the copy application layer 
Weeks is a result of the proposed method is to increase the shelf life of the plates, the decrease in the dissolution rate of the steel base and increase adhesion with the photosensitive layer.This technical result is achieved in that in the method of producing monoblastic on a steel framework, including degreasing in alkaline solution, electrochemical plating, and coating the photosensitive layer according to the invention, before application of the photosensitive layer, the surface of the steel plate are sequentially subjected to electrolytic degreasing, chemical activation of 5.0% solution of sulfuric acid, and then in 0.2% solution of oxalic acid for 30 to 35 seconds, and electrochemical plating with washing the plates after each treatment, followed by drying over 172 min at a temperature 90-91oC.Holding dual decamerone (sulfuric acid solution, and then with a solution of oxalic acid) can reduce the speed of the solution and to get more active surface for adhesion of the metal from the photosensitive layer.Example.According to the claimed method of monoblastic produced from carbon steel sheet, on the existing galvanoni, which greatly simplifies the process.After activation of the surface is performed chromium plating to thickness n 1 μm, conducted after each stage is provided by rinsing plates in cold water, then hold the drying plates for 172 min 90-91oC and applied to the surface of the photosensitive layer.The proposed method allows to obtain monoblastic where whitespace element is the very basis, and printing zagubiony the photosensitive layer.The advantage of this method compared to known is that upon receipt of bi - and tri-metal offset plates to protect steel from corrosion and for good adhesion with copper coating, but when going to the proposed method, such as copper plating, Nickel plating is missing, which gives significant savings in non-ferrous metals, energy, chemicals, makes the process environmentally friendly, does not require additional process equipment.The method allows the use of sheet material. The resolution obtained monoblastic not less than 200 l/seePlate obtained the claimed method meets all the requirements monoplotting on a steel base. The method of producing monoblastic on a steel framework, including degreasing in alkaline solution, electrochemical plating, and coating the photosensitive layer, characterized in that before applying the photosensitive layer surface of the steel plate are sequentially subjected to electrolytic degreasing, chemical activation of a 5% solution of sulfuric acid, and then in 0.2% solution of oxalic acid for 30 to 35 seconds and electrochemical plating with washing the plates after each treatment, followed by drying for 17 2 min at 90 91oC.
FIELD: negative printing forms developed in printing machine, which may be exposed by ultraviolet, visible or infrared radiation.
SUBSTANCE: cover-forming composition is described, which includes (i) polymerization-capable compound and (ii) polymer binding agent, containing polyethylene-epoxide segments, where polymer binding agent is selected from group which consists of at least one added copolymer, containing polymer of the main chain and polyethylene-epoxide side chains, block copolymer, containing at least one polyethylene-epoxide block and least one non polyethylene-epoxide block, and combinations of these. Also described is an element, in which image may be formed, including base and polymerization-capable covering composition.
EFFECT: differentiation between image sections exposed and non-exposed by electromagnetic radiation, facilitating development of non-exposed sections in water developing agents, increased resistance to development of exposed sections, ensured coloration capacity of the latter when not heated before development.
5 cl, 3 dwg, 11 ex
FIELD: printing industry.
SUBSTANCE: invention relates to technology of manufacturing printing forms for offset printing. Method of manufacturing printing forms for offset printing is realised by changing properties wettability of areas of work surface of printing forms, transformation of properties being realised due to change of chemical composition of work surface influencing on chosen areas by flux of accelerated particles. As substance of work layer applied is two- or poly- atomic inorganic material based on carbon with addition of aluminium atoms 0.01-20-at.% with thickness 1-1000 nm, which is covered on bottom layer with applied on it layer of aluminium or alloys on its base or on bottom layer from aluminium or based on it alloys.
EFFECT: invention allows to simplify and accelerate manufacturing process, increase of resolving capacity and endurance of providing multiple application of forms.
6 cl, 4 dwg, 1 tbl, 5 ex
SUBSTANCE: invention relates to a polymer which absorbs in the near infrared region, containing at least two different side infrared chromophoric groups which are covalently bonded to the main polymer chain which is soluble in resin bases, at least one of which is an indole cyanine dye and the other benz[e]indole cyanine dye. When using pre-printing coating of a photosensitive positive offset plate, stabilisation time required after production is considerably shorter and the additional process of conditioning before use is avoided. Pre-printing plates are preferably plates exposed to the image by a laser which emits in the near infrared region at wavelength between 780 nm and 850 nm.
EFFECT: improvement of operational characteristics.
11 cl, 2 tbl, 6 ex
SUBSTANCE: the invention relates to polymer colouring agents used in coating compositions to protect the image forming layer of the offset plates. Described are a new water-soluble polymer colouring agent with the absorption band ranging from about 300 nm to about 600 nm, and a coating composition for a thermographic offset plate which comprises: (a) the said polymer colouring agent with the absorption band ranging from about 300 nm to about 600 nm, and (b) organic microparticles which contain cross-linked copolymers of acrylate ot methylacrylate and styrole, 2-hydroxymethylacrylate, methacrylate, poly(oxyethylene)methacrylate or a linear or branched alkylmethacrylate; or inorganic nanoparticles containing silicone oxide or aluminium oxide. Described is the thermographic offset plate for reverse printing, containing (a) water receptive plate, (b) a layer positioned on the plate which forms the image in the near-infrared region, and (c) the coating layer which is positioned on the image-forming layer and contains the said coating composition.
EFFECT: reduction or elimination of background filling of the offset plates in the conditions of white light, elimination of the need to use separating paper when packaging offset plates.
7 cl, 10 dwg, 13 ex
SUBSTANCE: described is a polymerisable iodonium salt containing a positively charged iodine atom bonded with two aryl rings and a negatively charged counter-ion and at least one substitute containing a urethane and/or urea group, which is bonded with at least one of said aryl rings, wherein said substitute contains at least one functional group capable of cationic or radical polymerisation. Described also is a polyvinyl alcohol acetal copolymer containing at least one functional group, which is capable of cationic or radical polymerissation, preferably vinyl ether, alkoxy-methylacrylamide or alkoxy-methacrylamide. The invention also describes polymer binder for coating an offset printing plate from the polyvinyl alcohol acetal family, cellulose ether family and binder based on monomers, each containing at least one functional group capable of cationic or radical polymerisation. Described also is an offset printing plate coating solution containing said polymerisable iodonium salt, said polyvinyl alcohol acetal copolymer and said binder.
EFFECT: high quality of high-resolution image when the offset printing plate is used repeatedly.
17 cl, 25 dwg, 21 ex
SUBSTANCE: novel gallotannic compounds include gallotannin, wherein at least one hydroxyl group is substituted with a substitute, said substitute including a molecule, an oligomer or polymer, used in lithographic printing plate coatings, gallotannin or another gallotannin compound, wherein the substitutes are attached to gallotannin directly or through a linking group.
EFFECT: compounds can be used in a lithographic printing plate coating composition.
15 cl, 33 dwg, 49 ex
FIELD: printing industry.
SUBSTANCE: multi-layer lithographic printing form containing an adhesive layer that is accessible and insoluble in (A) oleophilic inks and alkaline or acidic aqueous moisturizing solutions used during printing with a printing form, and (B) alkaline or acidic aqueous developer solutions used during the printed form development. The said adhesive layer is also (I) soluble in an alkaline aqueous treatment solution, if the said developing solutions and the said wetting solutions are acidic, (ii) soluble in an acidic aqueous treatment solution, if the said developing solutions and the said wetting solutions are alkaline, (iii) the fusible or (iv) dry adhesive layer with a Shore A hardness of 60 or less.
EFFECT: said adhesive layer allows for the stratification of the printing form.
20 cl, 6 dwg, 2 tbl
SUBSTANCE: invention discloses polymer particles with size between 60 nm and 1000 nm and containing a polymer which contains a hydrophobic backbone chain formed by at least one segment which absorbs near-infrared radiation, bonded with chloroform which absorbs near-infrared radiation, having an absorption peak between 700 and 1100 nm; and at least one segment which is transparent for near-infrared radiation. The invention also discloses a method of producing said particles, a coating composition containing said polymer particles and a reactive iodonium oligomer, as well as a negative lithographic offset printing plate which contains a substrate, a hydrophilic bottom layer and a laser-developed top layer, where the laser-developed top layer contains said polymer particles.
EFFECT: disclosed particles enable to obtain coatings which ensure sufficient runability and machine developability of negative lithographic offset printing plates.
32 cl, 35 dwg, 4 tbl, 23 ex
SUBSTANCE: band for electrochemical graining consists of a rolled aluminium alloy. Band surface has a topography, the maximum peak height Rp or Sp of which is not more than 1.4 mcm, preferably not more than 1.2 mcm, in particular not more than 1.0 mcm. Besides, the invention relates to a manufacturing method of a lithographic band, as per which a lithographic band consisting of an aluminium alloy is subject to cold rolling and as per which, after the last run of the cold rolling, it is subject to degreasing treatment with an etching stage with a water etching medium, which contains at least 1.5-3 wt % of the mixture of 5-40% sodium tripolyphosphate, 3-10 wt % of sodium gluconate, 3-8 wt % non-ionic and anionic SAS, and when necessary, 0.5-70% of soda. Concentration of sodium hydroxide in the water etching medium is 0.1-5 wt %, and surface erosion as a result of degreasing treatment with simultaneous etching stage is at least 0.25 g/m2.
EFFECT: improvement of properties.
16 cl, 8 dwg, 3 tbl