摘要:
A plate making apparatus of a flexible plate material 13,22 being placed on a plate cylinder 7 for executing planographic printing in multiple colors. The plate making apparatus has a cutter 23 being placed between a storage section 21 of a roll-like plate material and an exposure section 25 for cutting the roll-like plate material like a sheet and punch means 30 for making plate cylinder engagement holes 14a and 14b in the left and right margins of the plate material along the transport direction thereof, the plate cylinder engagement holes to be engaged in protrusions 7a and 7b disposed in the circumferential direction of the left and right margins of the plate cylinder. Accordingly, it is possible to provide a plate making apparatus which reliably holds a plate material on a plate cylinder for enabling planographic printing and can use a roll-like plate material.
摘要:
A plate material the surface of which is formed of film including as its major component a material whose surface changes from a lipophilic state to a hydrophilic state by a photocatalytic reaction and returns to a lipophilic state when subsequently subjected to a heat treatment is used for making a printing plate. The plate material is exposed to active light over the substantially entire surface thereof with image-wise part kept unexposed. The part exposed to the active light becomes hydrophilic and repels ink while the part unexposed to the active light is kept lipophilic and receives ink. When the plate material is subsequently heated, the hydrophilic part is rendered lipophilic and the plate material can be reused.
摘要:
A a lithographic printing method comprising repetition of the steps of exposing a printing plate precursor having on the surface thereof a thin layer comprising TiO.sub.2, ZnO or at least one compound selected from the group consisting of RTiO.sub.3 wherein R represents an alkaline earth metal atom, AB.sub.2-x C.sub.x D.sub.3-x E.sub.x O.sub.10 wherein A represents a hydrogen atom or an alkali metal atom; B represents an alkaline earth metal atom or a lead atom; C represents a rare earth atom; D represents a metal atom of the group 5A of the Periodic Table; E represents a metal atom of the group 4A of the Periodic Table; and x represents a number of from 0 to 2, SnO.sub.2, Bi.sub.2 O.sub.3, and Fe.sub.2 O.sub.3 to active light to make the exposed area hydrophilic, and making the hydrophilic area hydrophobic by heat treatment.
摘要翻译:一种平版印刷方法,包括重复以下步骤:将其表面上具有包含TiO 2,ZnO或选自由以下组成的组的至少一种化合物的薄层曝光:其中R表示碱土金属原子,AB2 -xCxD3-xExO10其中A表示氢原子或碱金属原子; B表示碱土金属原子或铅原子; C表示稀土原子; D表示元素周期表5A族的金属原子; E表示周期表的基团4A的金属原子; x表示0〜2的数量,SnO 2,Bi 2 O 3,Fe 2 O 3与活性光的比例,使曝光面积亲水化,通过热处理使亲水区域成为疏水性。
摘要:
A lithographic printing plate is produced using a lithographic printing original plate which is composed of a paper support having a volume electric resistance adjusted to 1.times.10.sup.10 .OMEGA..multidot.cm or below by undergoing a conductive treatment, a metallic conductive layer provided on one surface of the support, a photoconductive layer composed of zinc oxide and a binder provided on the metallic conductive layer, and a laminate layer composed of an .alpha.-polyolefin having a volume electric resistance adjusted to 1.times.10.sup.10 .OMEGA..multidot.cm or below by undergoing a conductive treatment provided on the other surface of the support. The lithographic printing original plate is subjected to a negative corona discharge from the side having the photoconductive layer and in this charging, a conductor having an earth potential is contacted with the metal conductive layer from the side of the lithographic printing original plate, where an edge of metal conductive layer is exposed. Thereby, the photoconductive layer of the lithographic printing original plate is charged, forming a lithographic printing plate.
摘要:
An electrophotographic printing plate precursor having satisfactory mechanical strength and water-resistance and suitable to the direct electrical supply system, and a method for development thereof are disclosed.The electrophotographic printing plate precursor comprises an electrically conductive support having thereon a photoconductive layer and a back layer, the back layer being provided on the surface of the support opposite to the photoconductive layer, wherein the back layer comprises at least an outermost layer having a surface resistivity of from 1.times.10.sup.10 to 1.times.10.sup.14 .OMEGA. and an inner layer having a surface resistivity of less than 1.times.10.sup.10 .OMEGA..
摘要:
An original form for electrophotographic planography includes a paper support having thereon a photoconductive layer including a photoconductive material including at least zinc oxide and a resin binder, the exposure percentage of the zinc oxide on a surface of the photoconductive layer being in the range of from 2.1 to 5%.
摘要:
An excellent electrophotographic lithographic printing plate precursor capable of exhibiting a stable electrophotographic sensitivity and toner fogging density as well as less occurrence of background stains during printing can be produced in effective manner. The feature consists in a process for the production of an electrophotographic lithographic printing plate precursor having at least a photoconductive layer on a support, comprising coating a composition for a photoconductive layer comprising, as predominant components, a photoconductive material and a resin binder onto the support and then drying it by a drying air whose humidity is controlled to provide an absolute humidity of 5 to 70 g/kg . dried air.
摘要:
A method for preparing a lithographic printing plate and a light-sensitive material for a lithographic printing plate are disclosed. The method comprises providing a light-sensitive material comprising an electroconductive support having a hydrophilic surface. Provided on the surface is a light-sensitive layer which contains an electroconductive agent as well as a photoconductive insulating layer. The material is imagewise exposed and then electrophotographically processed to form an electrostatic latent image on the photoconductive insulating layer. The exposed material is developed with developer particles which are opaque to the light which the light-sensitive layer is sensitive. The light-sensitive layer of the developed material is exposed through the image. The exposed or unexposed areas of the light-sensitive layer are then removed together with the photoconductive insulating layer. The lithographic printing plate produced has excellent resolving power and does not cause printing stains.
摘要:
A method for making multilayer coating on a support, which comprises simultaneously applying multiple layers of at least two nonaqueous coating liquids on the support, at least one of the liquids containing an electron radiation curable compound, irradiating the applied layers with electron rays at a rate of 50 Mrad/sec. or less to cure them or to increase the viscosity thereof, and then drying. This method can be applied to the production of presensitized plates, multilayer photographic materials, multilayer analytical elements, etc.
摘要:
This invention relates to novel photosensitized sheet constructions which, upon exposure to an energy source through a screened image, can accurately and simultaneously reproduce said image in both its negative and positive forms.