JPS61272341A - Aluminum alloy for cylinder of photoengraving roll for gravure - Google Patents

Abstract

PURPOSE:To obtain the titled Al alloy for cylinder lighter in weight than the one made of iron and having superior adhesion of copper plating layer by incorporating specific percentage of Mg and Si to Al. CONSTITUTION:The Al alloy consisting of, by weight, 0.2-2.0% Mg, Si in a range of [(Mg)/1.73+0.05]-[(Mg)/1.73+1.5]%, and the balance Al with inevitable impurities and containing, if necessary, 1 or >=2 kinds among 0.05-1.5% Cu, 0.05-1.5% Mn, 0.05-0.50% Fe, 0.05-0.5% Cr and 0.05-0.5% Zr is prepared. When a photoengraving roll for gravure is manufactured by use of the above Al alloy, replacing work is made easy as its weight is about one-third that of the one made of iron and, moreover, excess Si enables improvement of etching characteristic to facilitate surface roughening, so that adhesion of copper plating layer can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an aluminum alloy for cylinders of plate-making rolls for gravure printing.

In addition, in this specification, "%" means iG ffi W
standard.

Prior Art and Its Problems Since the cylinder of a conventional plate-making roll for gravure printing is made of steel, the roll itself is very heavy. As a result, there were several problems as follows. This type of roll has a wide variety of windows with different diameters and/or lengths depending on the size of the printing target, and the required roll can be mounted on a stand, so the roll is always in use. It was necessary to carry out replacement work, but this work could not be done by one person and was inconvenient. In addition, the mount itself must be sturdy because it must support the rolls of different sizes, so it has to be expensive. Furthermore, since the rolls are heavy and have a large inertia, it is not easy to control the printing speed.

An object of the present invention is to provide an aluminum alloy that solves the above-mentioned problems and has excellent adhesion to the copper plating layer formed on the surface and can be used to form a cylinder of a plate-making roll for gravure printing.

Means for Solving the Problems In order to achieve the above object, the first invention provides
2-2.0%, S i [(Mg)/1°73+0
．． 05]% to [(MG)/1.73+1.5]%, the balance being aluminum and unavoidable impurities. 0%, si[(M
a)/1.73+0.05]% ~ [(Mg)/1°73
+1.5]% and Cub, 05-1.5%, Mn0.
05-1.5%, Fe0.05-0.50%, Or0.
0.05 to 0.5%, Zr0.0.

Function: Since the aluminum alloy for the cylinder of the plate-making roll according to the present invention has the above composition, tv1g2si
is generated, and the excess 3i seems to have a subtle influence on the precipitation distribution state of MQ2Si.

Incidentally, when copper plating is applied to the surface of a cylinder, the surface is roughened by etching in order to improve adhesion with the plating layer, and the excess 81 has the effect of improving etching properties. As a result, the aluminum alloy according to the present invention has better adhesion to the copper plating layer than pure aluminum, other aluminum alloys, and iron.

If Sl is less than the lower limit, the adhesion is insufficient,
If the upper limit is exceeded, corrosion resistance will be impaired due to the occurrence of intergranular corrosion.

MCI provides strength as a cylinder of a plate-making roll, but if it is less than the lower limit, the strength is insufficient, and if it exceeds the upper limit, extrusion with a boathole die becomes difficult. If aluminum alloy shapes for cylinders are made using boat hole dies, there is an advantage that there is no uneven thickness.

One or more of Cu, Mn, Fe, Cr, and Zr are added to further improve the strength, but below the lower limit the purpose of addition cannot be achieved; There is no point in adding it.

Example Examples of this invention are shown in the table below.

(Margin below) When cylinders were made from the aluminum alloys of the examples shown in the table above and used as plate-making rolls, copper plating was applied, and the adhesion was extremely good in all cases. A bending test was also conducted, and it was found that there were no problems as a plate-making roll, and that it could be used in place of the conventional M roll.

Effects of the Invention The cylinder made of the aluminum alloy according to the present invention has good adhesion to the copper plating layer and is free from corrosion compared to iron.

Furthermore, since the plate-making roll for long via printing using the above-mentioned cylinder is about 1/3 the weight of a conventional steel roll, it is convenient because one person can replace the roll, and the O- The roll frame does not need to be as sturdy as in the past, so it can be manufactured at a low cost.Furthermore, the roll is lighter and has less inertia, making it easier to control the printing speed.

that's all

Claims (2)

[Claims] (1) Mg0.2-2.0%, Si[(Mg)/1.7
3+0.05]% to [(Mg)/1.73+1.5]%
An aluminum alloy for use in cylinders of plate-making rolls for gravure printing, the balance being aluminum and unavoidable impurities. (2) Mg0.2-2.0%, Si[(Mg)/1.7
3+0.05]% to [(Mg)/1.73+1.5]%
and Cu0.05-1.5%, Mn0.05-1.5
%, Fe0.05-0.50%, Cr0.05-0.5
%, Zr of 0.05 to 0.5%, the balance being aluminum and unavoidable impurities.