120 results about "Planographic printing" patented technology

IR-sensitive lithographic printing plate precursors provide a stable print-out image using a unique IR radiation-sensitive composition in an infrared radiation-sensitive image-recording layer. This IR radiation-sensitive composition includes: (1) a free radical initiator composition that comprises an electron-donating agent; (2) a free radically polymerizable composition; and (3) a color-changing compound that is represented by the Structure (I) having a conjugated carbon chain between the aromatic terminal groups. The compound also has a —SO2—R3 group wherein R3 represents alkyl, aryl or heteroaryl groups. After IR imaging, these precursors exhibit desirable printout images both fresh and after dark storage. The precursors can be developed off-press or on-press.

In a stereolithography apparatus a material supply device for a printing material (16), in particular a photosensitive polymer, to be hardened is provided. The material supply device (10) accommodates a material cartridge (12) which in turn accommodates and completely surrounds the printing material (16). The material cartridge (12) can be connected liquid-tightly with an outlet valve unit (20) through which the printing material (16) can be discharged and which is at least partially accommodated in the material supply device (10) and is at least partially supported on or in the material supply device or is sealed with respect to the material supply device. The outlet valve unit (20) has a valve (100) which is opened and closed depending on the relative position, in particular the swivel position, of the material supply device (10) and the stereolithography apparatus.

A negative-working lithographic printing plate precursor has a negative-working infrared radiation-sensitive image-recording layer that has a) two or more free radically polymerizable components; b) an initiator composition capable of generating free radicals; and c) one or more infrared radiation absorbing cyanine dyes. The a) two or more free radically polymerizable components comprise a combination of a urethane (meth)acrylate and a polyester (meth)acrylate, which together, comprise 75-100 weight % of all free radically polymerizable components. The weight ratio of the urethane (meth)acrylates to the polyester (meth)acrylates is from 90:10 to and including 35:65. The urethane (meth)acrylates comprise one or more urethane linkages and at least 4 acrylate or methacrylate ester groups. Each of the one or more polyester (meth)acrylates is free of a urethane linkage and is represented following structure (I). These precursors are less sensitive to ambient ozone and can be infrared radiation imaged and developed on-press during lithographic printing.

The present invention provides an on-press developable lithographic printing plate precursor, and a method for producing a lithographic printing plate or a lithographic printing method using the on-press developable lithographic printing plate precursor. The on-press developable lithographic printing plate precursor comprises a support, an image recording layer, and an outermost layer in sequence. The image recording layer comprises an infrared absorber, an electron-donating polymerization initiator, and a polymerizable compound. The HOMO value of the infrared absorber and the HOMO value of the electron-donating polymerization initiator are 0.60 eV or less, and the outermost layer comprises a color-changing compound.

Cleaning contaminant particles from clamps in lithography equipment is described. Used clamps have burl tops that are contaminated with contaminant particles and need to be cleaned before returning to service. Currently, to thoroughly clean the burl tops of such clamps, the hard conductive coating covering the burl top is stripped and a new coating is applied. This requires disconnecting the clamp from the chuck, stripping the various coatings from non-burl areas of the clamp, and removing the high-voltage connections. The high-voltage connections are then re-established, the various coatings are reapplied, and the clamp is verified. Finally, the clamp is reconnected to the chuck, and production can continue. The new cleaning method allows for cleaning of the burl tops without the need to disconnect or remove the caps from the clamp to perform a burl top renewal, saving hours or weeks of downtime.

A positive-working lithographic printing plate precursor including a support and an image-recording layer formed on the support and consisting of a positive-working photosensitive resin composition, in which the positive-working photosensitive resin composition contains a compound having at least one electron-withdrawing group and at least one phenolic hydroxyl group in one molecule, an alkali-soluble resin, and an infrared absorber, and the electron-withdrawing group excludes a sulfonyl group; and a method of preparing a lithographic printing plate using the positive-working lithographic printing plate precursor.

A lithographic printing plate precursor has an aluminum substrate prepared using two anodization processes to provide an inner aluminum oxide layer having an average dry thickness of 300-3,000 nm and having a plurality of inner micropores having an average inner micropore diameter of <100 nm. An outer aluminum oxide layer is provided with a plurality of outer micropores having an average outer micropore diameter of 15-30 nm and a dry thickness of 30-650 nm. A hydrophilic layer is provided on the outer aluminum oxide layer having (1) a compound having an ethylenically unsaturated polymerizable group, an -OM group directly attached to a phosphorus atom, wherein M represents a hydrogen, sodium, potassium, or aluminum atom; and (2) one or more hydrophilic polymers having (a) a repeating unit comprising an amide group, and (b) a repeating unit having an -OM' group directly attached to a phosphorus atom, wherein M' represents a hydrogen, sodium, potassium, or aluminum atom. 2 An outer aluminum oxide layer is provided with a plurality of outer micropores having an average outer micropore diameter of 15-30 nm and a dry thickness of 30-650 nm. A hydrophilic layer is provided on the outer aluminum oxide layer having (1) a compound having an ethylenically unsaturated polymerizable group, an -OM group directly attached to a phosphorus atom, wherein M represents a hydrogen, sodium, potassium, or aluminum atom; and (2) one or more hydrophilic polymers having (a) a repeating unit comprising an amide group, and (b) a repeating unit having an -OM' group directly attached to a phosphorus atom, wherein M' represents a hydrogen, sodium, potassium, or aluminum atom.

A method, apparatus and computer program for repairing defects in lithographic masks, in particular EUV masks, are disclosed. The method for repairing defects in lithographic masks, in particular EUV masks, comprises the steps of: (a.) performing a first repair step on the defect at a first repair dose, causing the defect to change from an initial topography to a first defect topography; (b.) determining the effect of the first repair step on the topography of the defect; (c.) determining a second defect topography to be achieved at the defect for a second repair step to be performed on the defect; (d.) determining a second repair dose for the second repair step, the determination being based at least in part on the determined effect of the first repair step on the topography of the defect and the second defect topography. Furthermore, the method can comprise the step of (e.) performing the second repair step at the second repair dose.

A negative working lithographic printing plate precursor has a negative working infrared radiation sensitive image recording layer having a) two or more free radical polymerizable components; b) an initiator composition capable of generating free radicals; and c) one or more infrared radiation absorbing cyanine dyes. A) the two or more radically polymerizable components comprise a combination of a urethane (meth) acrylate and a polyester (meth) acrylate together making up 75-100% by weight of all the radically polymerizable components. The weight ratio of the urethane (meth) acrylate to the polyester (meth) acrylate is from 90: 10 to 35: 65. The urethane (meth) acrylate comprises one or more urethane linkages and at least 4 acrylate groups or methacrylate groups. The one or more polyester (meth) acrylates each do not contain a urethane bond and are represented by the following structure (I). These precursors are less sensitive to ambient ozone and can be imaged by infrared radiation and developed on-press during lithographic printing.

Provided is a method of setting a lithographic printing machine capable of reducing the amount of discarded printbooks produced during printing on the printing machine. According to the method, paper which has been used in the printing process of a printing press of a previous printing batch and comprises a first color bar is used; the method includes the step of exposing the second color bar at a stamp location different from the location of the first color bar.

A lithographic printing plate precursor comprises a coating on a substrate having a hydrophilic surface or provided with a hydrophilic layer, the coating comprising a photopolymerizable layer comprising a polymerizable compound, a photoinitiator and an adhesion-promoting compound containing at least one thiol group and at least one group capable of adhering to the substrate.

A system comprising a memory and at least one processing device operatively coupled to the memory to perform operations comprising initiating a digital lithography process to pattern a substrate using a digital lithography system, controlling an area ratio in a first direction with respect to a first pair of adjacent exposure cells of the digital lithography system, and controlling a dose ratio in a second direction perpendicular to the first direction with respect to a second pair of adjacent exposure cells of the digital lithography system.

In the present invention, there are provided an on-press development type lithographic printing plate precursor including an image-recording layer on a support, in which the image-recording layer contains a color-forming compound having a group that cleaves by infrared exposure, a polymerization initiator, a polymerizable compound, and a hydrogen-donating compound, and the hydrogen-donating compound is a compound different from the polymerization initiator, the polymerizable compound, the color-forming compound, and an acid-cleavable compound and is a compound having at least one group selected from the group consisting of —OH, —NH—, —SO2—NH—, —SO2—OH, —CO—NH—, and —CO—OH in a molecule and having a molecular weight of less than 3,000, and a method of preparing a printing plate.

The present invention addresses the problem of providing a positive lithographic printing plate precursor and a method for producing a lithographic printing plate, said positive lithographic printing plate precursor having good development discrimination and having good brush resistance and image portion scratch resistance. The present invention provides a positive lithographic printing plate precursor and a method for making a lithographic printing plate using the positive lithographic printing plate precursor. The positive lithographic printing plate precursor comprises: a support; and an image recording layer formed from a positive photosensitive resin composition on the support. The positive photosensitive resin composition contains: a compound having at least one electron withdrawing group and at least one phenolic hydroxyl group in one molecule; an alkali soluble resin; and an infrared absorbent, wherein the electron withdrawing group does not include a sulfonyl group.

To provide an on-press development type lithographic printing plate original plate which can suppress plate shift of a lithographic printing plate during printing by a lithographic printing plate, and a method for manufacturing a printing plate using the on-press development type lithographic printing plate original plate.SOLUTION: There are provided an on-press development type lithographic printing plate original plate which has an image recording layer on a support, wherein tensile strength of the support is 160 MPa or more, and a coefficient of static friction between the outermost layer surface opposite to a side having the image recording layer and metal SUS 316 is 0.50 or less.SELECTED DRAWING: None

The invention relates to the technical field of lithographic printing plate materials, and particularly discloses an anti-sticking on-machine developing negative image thermosensitive CTP plate material and a preparation method thereof, the anti-sticking on-machine developing negative image thermosensitive CTP plate material is composed of an aluminum-based substrate, a photosensitive layer and a wool treatment liquid; the rough surface treating fluid comprises the following components: nano silicon dioxide particles, an inorganic stabilizer, an organic binder and the balance of deionized water or ethanol; the formed double-layer photosensitive layer is strong in hydrophilicity and good in photosensitive stability, the nano silicon dioxide added in the rough surface treatment liquid can be stabilized by controlling the proportion content of different particle sizes, the inorganic stabilizer can be used for stabilizing the nano silicon dioxide, and the organic binder can be used for promoting the nano silicon dioxide to be dispersed and stably combined with the photosensitive layer; the Ra value of the formed CTP plate subjected to rough surface treatment is 0.8-2.5 microns, the bonding strength with lining paper is reduced by 60% or above, the plate preparation method has process compatibility, the performance of a photosensitive layer is not affected, the plate has storage stability, and the adhesion phenomenon is not observed when the plate is stored for 6 months under the high-humidity condition.

Printing method with improved ink transfer comprising the steps of: identifying, on a digital prepress information, at least one monochrome image as an opaque base coat, a transparent varnish coat, and / or a metallic image, configuring some of the printing units (10) of a printing machine as lithographic printing units with a rubber sleeve (40) on a first cylinder (11) and lithographic plates (41) on a second cylinder (12); and configuring at least one of the printing units (10) as a non-lithographic printing unit with improved ink transfer by including a relief plate (42) or a relief cylindrical sleeve (43) surrounding one of the first and second cylinders (11, 12) adapted to print one of the monochrome images identified as an opaque base coat and / or as a transparent varnish coat and / or as a metallic image, and by including the rubber sleeve (40) surrounding the other of the first and second cylinders (11, 12). A corresponding printing machine for printing according to the aforementioned method is also provided.

The present application belongs to the technical field of lithographic printing, and particularly relates to a tap water offset printing water quality stabilizer and a preparation method and use method thereof. The tap water offset printing water quality stabilizer comprises the following components in mass percentage: a buffer system 5-17%, a microbial bacteria liquid 1-10%, a printing plate protective agent 1-5%, a microbial maintenance system 5-20%, a clean plate enhancer 3-30%, a defoaming agent 0.5-5%, and the balance comprising water. The tap water offset printing water quality stabilizer prepared by the present application solves the problems that the dampening water is difficult to be standardized due to different standards of tap water hardness, pH, water quality and total solid content in different places, and that paper dust, paper fluff and grease gradually accumulate in the dampening water in the printing production process, resulting in increased waste water and decreased printing quality.

Provided are an on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support in which the image-recording layer contains a coloring compound capable of having a coloring reaction with a decomposition product generated by exposure of the image-recording layer, and an on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support in which the image-recording layer contains a compound represented by Formula 1C or Formula 2C and an electron-donating polymerization initiator. In Formula 1C and Formula 2C, R1C to R4C each independently represent a monovalent organic group, L1C and L2C each independently represent a divalent organic group, AC represents OH or NR5CR6C, and R5C and R6C each independently represent a monovalent organic group

The present invention relates to an on-press developing lithographic printing plate precursor, a method for producing a lithographic printing plate using the on-press developing lithographic printing plate precursor, and a lithographic printing method, the on-press developing lithographic printing plate precursor having a support and an image recording layer on the support, the image recording layer contains a polymerizable compound and polymer particles, the median diameter of the polymer particles is 50-120 nm, the content of the polymer particles is 42-90 mass% relative to the total mass of the image recording layer, and after osmium dyeing treatment is performed on the thickness-direction cross section of the lithographic printing plate precursor, the thickness-direction cross section of the lithographic printing plate precursor is greater than the thickness-direction cross section of the lithographic printing plate precursor, and the thickness-direction cross section of the lithographic printing plate precursor is greater than the thickness-direction cross section of the lithographic printing plate precursor. In a cross-sectional image obtained by binarizing a cross-sectional image obtained by scanning electron microscope observation into a dyed section and a non-dyed section, the standard deviation of the area ratio of the non-dyed section is less than 6.

The present invention provides an on-press development type lithographic printing plate precursor and a method for manufacturing a printing plate, the on-press development type lithographic printing plate precursor having an image recording layer on a support, the image recording layer contains a chromophoric compound having a group that cleaves by infrared exposure, a polymerization initiator, a polymerizable compound, and a hydrogen-donating compound, and the hydrogen-donating compound is a compound different from the polymerization initiator, the polymerizable compound, the chromophoric compound, and the acid-cleaving compound. And a compound having a molecular weight of less than 3,000 and having at least one group selected from the group consisting of-OH,-NH-,-SO2-NH-,-SO2-OH,-CO-NH-, and-CO-OH in the molecule.

The invention relates to an ink formula for scraping silver and a printing method of the scraping silver. The formula comprises bottoming oil and a silver scraping solution, the priming oil comprises resin, an initiator, a monomer and a filler; the scraping silver solution comprises resin, a monomer, an initiator, a filler and silver paste; a high-speed lithographic printing machine is used for multiple times of bottom oil printing on paper, then scraping silver solution printing is carried out, and finally scraping silver is formed. According to the printing ink formula and a high-speed flat plate printing machine, a printed sheet is subjected to multiple times of bottom oil printing, gaps in the surface of the paper are filled, adhesion and covering of the scraping silver printing ink are enhanced, then scraping silver printing is carried out, high-speed flat plate scraping silver printing is achieved, and the printing efficiency is improved. And the printing efficiency is high, mass production can be realized, and the positioning gauge is accurate, uniform and flat.

The present invention aims at obtaining a seamless planographic printing plate precursor and a seamless planographic printing plate, which are excellent in image reproducibility necessary for obtaining a high-fineness seamless planographic printed matter. Further, it aims at obtaining a seamless planographic printing plate precursor and a seamless planographic printing plate, which are easy to regenerate the cylindrical support. The present invention is a seamless planographic printing plate precursor having, in order on the outer circumferential surface of a cylindrical support, a respective continuous easy-peeling primer layer and an ink-repellent layer.

The present application provides a support for a lithographic printing plate, a lithographic printing plate precursor, and a method for producing a lithographic printing plate precursor, the support for a lithographic printing plate being capable of obtaining a lithographic printing plate precursor excellent in scratch resistance by being combined with an image recording layer. The support for a lithographic printing plate of the present application is a support for a lithographic printing plate including an aluminum plate and an anodized film of aluminum provided on the aluminum plate, a plurality of convex portions being present on the surface on the side of the anodized film of the support for a lithographic printing plate, the average value of the equivalent circle diameters of the cut surfaces of the convex portions in the positions higher than the position of the average height of the convex portions by 0.5 μm or more being 3.0 to 10.0 μm, and the density of the convex portions having a height higher than the position of the average height of the convex portions by 0.5 μm or more being 3000 to 9000 pieces / mm 2 .

The invention provides a microstructure anti-sticking type on-machine developing negative image CTP plate material and a preparation method thereof, and belongs to the technical field of lithographic printing plate materials. The plate material comprises an aluminum-based substrate, a photosensitive layer and a surface anti-sticking layer, wherein the surface anti-sticking layer is formed by curing rough surface treatment liquid containing composite silicon dioxide particles and temperature-sensitive polymer microspheres, and the surface roughness Ra of the surface anti-sticking layer is 0.8-2.5 microns; the rough surface treating fluid comprises water, composite silicon dioxide particles, temperature-sensitive microspheres, a fluorine-containing siloxane coupling agent, epoxy modified silica sol, an ionic liquid antistatic agent and a PVP binder. According to the invention, a micron-sized composite rough surface structure is formed through ultrasonic atomization spraying and a step drying process, so that the stripping force of the plate material and the lining paper in a high-temperature and high-humidity environment is reduced to be less than or equal to 0.8 N / m, and the plate material and the lining paper have relatively high printing endurance rate, the development defect rate is 0, and the storage stability is good.

A lithographic printing plate precursor includes: a support; and an image-recording layer on the support, and the image-recording layer contains (meth)acrylic polymer A having a substituent containing two or more silicon atoms in a side chain.

The invention provides an ink composition including (A) a polymerization initiator and (B) a (meth)acrylic acid ester having an alicyclic group as a substituent or amide having an alicyclic group as a substituent. The ink composition preferably further contains (D) a colorant and (E) a sensitizing dye. The ink composition is used for ink jet recording.

An on-press developing lithographic printing original plate having a support body and an image recording layer on the support body, the image recording layer containing (1) or (2). (1) A borate compound represented by formula (1) and an electron-accepting polymerization initiator. (2) A borate compound represented by formula (1a). In formula (1) and formula (1a), R1, R2, R3, and R4 each independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted alkynyl group; r1, R2, R3 and R4 may each independently have a ring structure. In this connection, at least one of R1, R2, R3, and R4 is different from the others. M + represents a cation. Ma + represents an iodonium cation.