The solution for the manifestation of monometallic offset printing plates
(57) Abstract:The inventive solution for the manifestation contains a hydroxide of an alkali metal of 0.5 - 1.0%, salt of carboxylic acid - oxytrichloride or discoverphoto 0.1 to 5.0% and the water - the rest. As a salt of carboxylic acid solution contains, for example, salt doxycyclinebuy or oxytrichloride acid. table 1. The invention relates to printing production, namely the technology of offset printing plates, and more specifically to a solution for the manifestation of monometallic aluminum printing plates with a positive photosensitive layer on the basis of ordinationand (ONHD).For the manifestation of printed forms on the basis of ONHD use an aqueous-alkaline solutions. The most effective of these are solutions translesanas phosphate Na3PO4the solutions of sodium hydroxide (caustic lye) NaOH and the solution of acid sodium (sodium silicate) Na2SiO3.Manifest solutions for modern pre-chuvstvennyh plates must meet certain requirements: to ensure the required accuracy of tonal image transfer, the hydrophilicity privatecustomer layer to the solution, to have a high buffer capacity, to comply with environmental standards. The above solutions in varying degrees satisfy these conditions.The disadvantages of developing solutions based on translesanas phosphate are low buffer capacity, high wetting angle space form elements (poor hydrophilicity) and the need for long exposures in the copy process to ensure the required gradation image transmission. In practice, to reduce the time of exposure in phosphate solutions are often injected with sodium hydroxide. However, the corrosion rate of aluminium in such developers increases in 25-30 times.Aqueous solutions of acid sodium as a developer unlike phosphate provide good hydrophilic properties of the surface and practically do not cause corrosion of aluminum (provided there is no free alkali). But at the same time, they have a low buffer capacity, require large displays and, furthermore, formed during operation of the developer silica gel complicates the treatment of wastewater.Solutions of sodium hydroxide in comparison with the above are large in the developer depending on the concentration of the hydroxide of an alkali metal.The disadvantage of developing solutions based on the hydroxide of alkaline metal (sodium or potassium) is a low hydrophilicity white-space form elements and corrosive effect on aluminum. Negative role of corrosion processes is the destruction of the anodic film on space stations form, the leakage of small image elements.The invention aims to remedy these disadvantages, namely improving the quality of the solution for improving the physico-chemical properties of the printing form.The problem is solved in that the solution for the manifestation of monometallic offset printing plates, mostly with the photosensitive layer on the basis of ONHD containing alkali metal hydroxide and water, according to the invention further comprises a salt of carboxylic acid - oxytrichloride or doxycyclinebuy in the following ratio, wt.%:
The hydroxide of the alkali metal of 0.5-1.0
Salt of carboxylic acid is 0.1 to 5.0
Water the Rest
P R I m e R 1. Take pre-chuvstvennuyu plate with a photosensitive layer on the basis of ONHD, combine slide and exhibit in the copy device metallised playback control scales.Taxpayerfunded plate is placed in a processing unit in which it passes successively operation manifestations, washing, applying preservative coating and drying. Made thus printed form suitable for use in the printing machine.The composition of the developing solution, wt.%:
Sodium hydroxide 0.5 to
Characteristics of the solution are presented in table (solution 4).This solution can be used for the display of pre-chuvstvennyh plate-type UPA-1 and UPA-2 (TU 15-0463801-11-91). It provides sufficient hydrophilicity gap elements, which does not require additional hydrophilicity form any other solutions (the value of the wetting angle is 2 times lower compared to solution 3) and has a low rate of corrosion rate (4 times less than in the solution 3). The high stability of the photosensitive layer to this developer allows you to use it for both automated and manual (in a ditch) ways of manifestation (the latter is preferable). The accuracy tonal transfer raster and stihovi what I printed forms, as in example 1.The composition of the developing solution, wt.%:
Sodium hydroxide 0,7
Water of 97.8
Characteristics of the solution are presented in table (solution 5).This solution can be used for the display of pre-chuvstvennyh plate-type UPA-1". "The UPA-2" and "Azazel". It has a high buffer capacity, provides good hydrophilicity white-space form elements and low corrosion rate, is designed for automated and manual methods of manifestation.P R I m e R 3. The procedure for manufacturing the printing plate as in example 1.The composition of the developing solution, wt.%:
Sodium hydroxide 0,7
Potassium-sodium tartrate 1,5
Water of 97.8
Characteristics of the solution are presented in table (solution 6). The purpose of the solution, as in example 2.P R I m e R 4. The procedure for manufacturing the printing plate as in example 1.The composition of the developing solution, wt.%:
Potassium hydroxide 0,7
Characteristics of the solution are presented in table (solution 7). The purpose of the solution, as in example 2. It is recommended to use dust, as in example 1.The composition of the developing solution, wt.%:
Potassium hydroxide 0,8
Characteristics of the solution are presented in table (solution 8).This solution can be used for the display of plate-type Azazel" in automated and manual methods of making forms. It ensures the preservation of existing on the surface of these plates under the photosensitive layer of hydrophilic film (the value of the wetting angle is 15about), economical from the point of view of consumption of chemicals (salt concentration is 10-20 times lower than in other compositions).P R I m e R 6. The procedure for manufacturing the printing plate as in example 1.The composition of the developing solution, wt.%:
Sodium hydroxide 1,0
Potassium-sodium tartrate 5,0
Characteristics of the solution are presented in table (solution 9).This solution can be used for the display of plate-type UPA-1 and UPA-2". It has a high buffer capacity, creates a strong hydrophilic film on space stations form (the value of the wetting angle is 15aboutrequires low exposures (avannah installations.These manifesting solutions (table, solutions 4-9) have a high pH the pH, the greater the buffer capacity, create a hydrophilic film on a whitespace areas of the printing form, have little corrosive effect on aluminum (3-12 times less than 0.5% solution of sodium hydroxide) and provide the required accuracy of the gradation image transmission at low exposures. The stability of the photosensitive layer to these solutions is lower than that of the prototype, however, this value provides a sufficient safety signs (6-20 times during the duration of the manifestation forms 15-60). The SOLUTION FOR the manifestation of MONOMETALLIC OFFSET PRINTING plates mainly with the photosensitive layer on the basis of ordinationand containing alkali metal hydroxide and water, wherein the solution further comprises a salt of carboxylic acid - oxytrichloride or doxycyclinebuy, in the following ratio, wt.%:
The hydroxide of an alkali metal - 0,5 - 1,0
Salt of carboxylic acid is 0.1 to 5.0
Water - The Rest
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