Aluminum alloy plate for lithographic printing plate
A lithographic printing plate, aluminum alloy plate technology, applied in printing, printing process, printing plate, etc., can solve the problems of reduced production efficiency and increased manufacturing cost, and achieve uniform recrystallization degree, fine recrystallized particles, and pits Occurs evenly and finely
Active Publication Date: 2014-06-18
FUJIFILM CORP +1
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Problems solved by technology
[0007] Conventionally, these aluminum alloy materials for lithographic printing plates have been subjected to homogenization treatment of ingots, hot rolling, cold rolling, and intermediate annealing in the middle of cold rolling to form a recrystallized structure on the surface of the rolled sheet. Secondary cold rolling, thereby making the generation of pits during electrochemical etching treatment uniform, and preventing the occurrence of streaks when processing as a printing plate, but performing intermediate annealing inevitably brings about a reduction in production efficiency and an increase in manufacturing costs. increase, hope to improve
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Embodiment 1
[0050] Embodiment 1, comparative example 1
[0051] An aluminum alloy having the composition shown in Table 1 was melted and cast, and the rolled surface of the obtained ingot was cut by 5mm / one side so that the thickness became 500mm, and each ingot was homogenized under the conditions shown in Table 2. Texturization treatment, hot rolling, and finishing hot rolling to make the plate thickness reach the specified thickness, and then coiled into coils. After the hot rolling, cold rolling was performed without intermediate annealing to obtain a cold-rolled material having a plate thickness of 0.3 mm. In addition, in Tables 1 and 2, those which deviate from the conditions of this invention are underlined.
[0052] Table 1
[0053]
[0054] "Remarks" only Ga unit uses ppm, others use mass%
[0055] Table 2
[0056]
[0057] Using the cold-rolled material as the test material, the following method is used to measure the average recrystallized grain size in the direction pe...
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Abstract
The invention provides an aluminum alloy plate for a lithographic printing plate. Cold rolling is performed to the final thickness without intermediate annealing after hot rolling, and Ga and Ma are concentrated on the surface part so that pits in electrolysis treatment are generated uniformly; and when the printing plate is treated, no stripes are generated. The aluminum alloy plate for the lithographic printing plate contains 0.03 to 0.15 percent of Si, 0.2 to 0.7 percent of Fe, 0.05 to 0.5 percent of Mg, 0.003 to 0.05 percent of Ti, 30 to 300ppm of Ga, and the balance of aluminum and inevitable impurities. The aluminum alloy plate is characterized in that: the average re-crystallization grain diameter in the direction vertical to the calendaring direction of the surface part is less than 50 microns, the Mg concentration of the surface part from the surface to the position with depth of 0.2 micron is 5 to 50 times average Mg concentration, and the Ga concentration of the surface part from the surface to the position with depth of 0.2 micron is 2 to 20 times average Ga concentration.
Description
technical field [0001] The present invention relates to an aluminum alloy plate for lithographic printing plates, in particular to an aluminum alloy plate for lithographic printing plates which is suitable for surface roughening by electrochemical etching and has excellent production efficiency during manufacture. Background technique [0002] As a support for lithographic printing plates (including offset printing plates), an aluminum alloy plate is usually used. From the viewpoint of improving the adhesion of the photosensitive film and improving the water retention of the non-image area, the surface of the support is roughened, but in recent years In the past, due to the excellent plate-making adaptability and printing performance, and the continuous processing in the coil, the method of roughening the surface of the aluminum alloy plate for the support by electrochemical etching has been rapidly developed. [0003] As an aluminum alloy plate that can obtain relatively un...
Claims
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IPC IPC(8): B41N1/08
Inventor 上杉彰男松浦睦扇博史日比野淳
Owner FUJIFILM CORP