摘要:
A lithographic printing plate precursor is disclosed, comprising a metal support having formed thereon an anodic oxide film, and an image-forming layer containing a light-to-heat converting agent, or a light-sensitive layer capable of image-forming with infrared laser exposure provided in this order from the support.
摘要:
The present invention provides a planographic printing plate capable of ensuring improvement of productivity and stability of a small dot net portion due to improvement of adhesion. There is provided a planographic printing plate, characterized in that a surface of an aluminum plate being a support element of the planographic printing plate has been subjected to preliminarily polishing mechanically by at least 0.1 &mgr;m; chemical etching treatment by at least 0.1 &mgr;m; electrochemically surface-roughening; and anodic oxidation, and for a surface structure of the aluminum plate: (a) an area (S) for a graphic formed by a reference straight line drawn from a top of a third highest mountain of a two-dimensional roughness curve downwardly by 1 &mgr;m and a roughness curve upper than the reference straight line is 30 &mgr;m2≦S≦150 &mgr;m2; (b) an average roughness Ra of average lines is 0.15 &mgr;m≦S≦Ra≦0.60 &mgr;m; (c) a relationship between the average roughness Ra of average lines and a height Rp of a center line is Rp≦6Ra; (d) a relationship between a maximum height Rmax and the average roughness Ra of average lines is Rmax≦12Ra; and (e) a surface area difference is between 20% and 70%.
摘要翻译:本发明提供一种平面印刷版,其能够确保由于粘合性的提高而提高小网状部分的生产率和稳定性。 提供了一种平版印刷版,其特征在于,将作为平版印刷版的支撑元件的铝板的表面经过机械预先磨光至少0.1μm; 化学蚀刻处理至少0.1毫米; 电化学表面粗糙化; 和阳极氧化,以及铝板的表面结构:(a)由二维粗糙度曲线的第三高山顶部的参考直线形成的图形区域(S)向下1 妈妈和高于参考直线的粗糙度曲线为30 mum2 <= S <= 150 mum2; (b)平均线的平均粗糙度Ra为0.15μm<= S <= Ra <=0.60μm; (c)平均线的平均粗糙度Ra与中心线的高度Rp之间的关系为Rp <= 6Ra; (d)最大高度Rmax与平均线的平均粗糙度Ra之间的关系为Rmax <= 12Ra; 和(e)表面积差为20%至70%。
摘要:
A process for the preparation of a photosensitive lithographic printing plate which comprises providing a photosensitive layer on an aluminum support obtained by treating an anodized aluminum substrate with an aqueous solution having a pH value of from 1.5 to 5 is disclosed.
摘要:
In a process for producing an aluminum support of a lithographic printing plate, the desired aluminum support is produced by imparting fine asperities to an aluminum plate and then roughening it electrochemically in an acidic aqueous solution. The roughened aluminum plate may be electropolished or chemically etched.
摘要:
A method for producing an aluminum support for a lithographic printing plate comprising the steps of (a) electrolytic polishing an aluminum plate in an alkaline aqueous solution; and (b) electrochemically surface roughening the aluminum plate using direct or alternating current in an acidic aqueous solution in this order, and also a method for producing an aluminum support for a lithographic printing plate comprising an electrolytic polishing step of treating an aluminum plate used as an anode in an alkaline aqueous solution at a current density of 5 A/dm.sup.2 to 200 A/dm.sup.2 while allowing the alkaline aqueous solution to flow between the aluminum plate and an electrode at an average flow rate of 10 cm/second to 400 cm/second.
摘要:
A rotating preparatory abrasion roller finely abrades the surface of a web, which is to be a support of a lithographic plate, in preparatory abrading prior to main graining for graining the surface of the web. The preparatory abrasion roller, which is arranged against one surface of the running web, is pressed into an interval between a pair of supporting rollers, which are arranged at a predetermined interval against the other surface of the web. Consequently, the surface of the web is finely abraded in contact with a relatively large area on the surface of the preparatory abrasion roller in the state wherein the web laps with the part of the preparatory abrasion roller.
摘要:
A process for manufacturing a lithographic printing plate support made of aluminum or an aluminum alloy, in which the surface of the support is mechanically roughened by graining it with a brush comprising bristles which have a bending elastic modulus of 10,000 to 40,000 kg/cm.sup.2 and a nerve of 500 g or less per bristle, whereby generation of defective products due to defects such as scratching which aluminum itself has can be prevented and a lithographic printing plate support having scumming reduction even on squeezing water out can be provided.
摘要翻译:一种制造由铝或铝合金制成的平版印刷版支撑件的方法,其中通过用包括具有10,000至40,000kg / cm 2的弯曲弹性模量的刷毛的刷子将其支撑体机械粗糙化, 可以防止由于由于诸如刮擦等缺陷而导致的铝本身具有的缺陷产生的缺陷产物的产生,并且可以提供即使在挤出水时也具有浮渣减少的平版印刷版支撑件。
摘要:
A process for roughening a surface of a support for a lithographic printing plate in which an electric current is supplied between a metal web and an electrode facing the metal web in an electrolyte containing metal ions so that the metal web is subjected to electrochemical processing continuously, 1-20 pause sections are provided in the electrochemical processing and the time taken for passage through once processing pause section in the electrochemical processing is set to 1-30 seconds. With the process, the grain shape can be controlled with no troublesome condition setting to improve a scumming resistance without deteriorating a printing durability and a fill-in reduction so that the plate has superior performance.
摘要:
A support for a planographic printing plate support in which variations in the quality of the material of the aluminum support are reduced to thereby improve the yield in an electrolytic graining treatment and which is excellent in susceptibility to graining, has no stripe irregularities, and excellent appearance, and a method for producing such a planographic printing plate. An aluminum plate material is formed through a twin-roller continuous casting apparatus and subjected to cold rolling. Successively, the plate is subjected to heat treatment so as to form a surface portion of a depth of at least 15 .mu.m in the thickness direction having no recrystallization in the surface layer. If necessary, the plate may be subjected to cold rolling again as final rolling. Thereafter, the plate is subjected to correction.
摘要:
Disclosed are (i) a method of producing a support for planographic printing plate, which comprises melting an aluminum ingot having an aluminum content of not less than 99.7 wt % to prepare a cast ingot, scalping the surface of the cast ingot, soaking the scalped cast ingot, cold rolling the soaked ingot to a thickness of 0.1 to 0.5 mm, correction of the resulting sheet to prepare an aluminum support, and then graining the aluminum support and (ii) a method of producing a support for planographic printing plate, which comprises melting an aluminum ingot having an aluminum content of not less than 99.7 wt % to prepare a cast ingot in a melt holding furnace, directly subjecting the cast ingot to continuous casting to prepare a thin sheet having a thickness of 2 to 30 mm, cold rolling the thin sheet, correction of the resulting sheet to prepare an aluminum support, and then graining the aluminum support.