Hydro Aluminium Rolled Products Gmbh

Hydro Aluminium Deutschland Gmbh

Vereingte Aluminum-werke Aktiengesellschaft

Vereinigte Aluminium-werke Aktiengellschaft

Jochen Hasenclever

Bernhard Kernig

Gerd Steinhoff

Christoph Settele

Henk-Jan Brinkman

Werner Droste

Stefan Knabben

Katrin Kuhnke

A method for producing aluminum strips for lithographic printing plate supports, wherein the aluminum strip is produced from a rolling ingot, which after optional homogenizing is hot-rolled to a thickness of 2 mm to 7 mm and cold-rolled to a final thickness of 0.15 mm to 0.5 mm provides for an aluminum strip having a thickness of 0.15 mm to 0.5 mm and a printing plate support produced from the aluminum strip.

Aluminum strip for lithographic printing plate carriers and the production thereof

The invention relates to an aluminium alloy for the production of lithographic printing plate supports and also to an aluminium strip produced from the aluminium alloy, a process for the production of the aluminium strip and also its use for the production of lithographic printing plate supports. The object of providing an aluminium alloy as well as an aluminium strip from an aluminium alloy that permits the production of printing plate supports having improved bending-strength fatigue transverse to the rolling direction without adversely affecting the tensile strength values before and after the annealing process and while preserving the roughening properties, is achieved by the fact that the aluminium alloy contains the following alloy components in weight percent:

Aluminium strip for lithographic printing plate supports with high flexural fatigue strength

Provided is a method for production of an aluminium strip for lithographic printing plate supports from an aluminium alloy including (in wt %): 0.05%&#x2264;Si&#x2264;0.25%, 0.2%&#x2264;Fe&#x2264;1%, Cu max. 400 ppm, Mn&#x2264;0.30%, 0.10%&#x2264;Mg&#x2264;0.50%, Cr&#x2264;100 ppm, Zn&#x2264;500 ppm, Ti&#x3c;0.030%, the remainder aluminium and unavoidable impurities individually at most 0.03%, in total at most 0.15%. In the method, a rolling ingot is cast from an aluminium alloy, and the rolling ingot is homogenised. Further, the rolling ingot is hot rolled to a hot strip final thickness, and the hot strip is cold rolled to final thickness of between 0.1 mm and 0.5 mm. The product of the relative final thicknesses of the aluminium strip after the first and after the second cold rolling pass of the aluminium strip is 15% to 24%.

Litho strip with high cold-rolling pass reduction

The invention relates to an aluminum alloy strip for the production of printing plate carriers comprising water-based coatings, wherein the aluminum alloy strip has a thickness of at most 0.5 mm. The object is to propose an aluminum alloy strip for the production of printing plate carriers comprising at least one water-based coating so that punctiform coating faults are prevented. The object is achieved for an aluminum alloy strip in that the aluminum alloy strip, in a longitudinal polished section prepared using water as a lubricant, has etch figures with a cubic etching, of which the longitudinal extent is at most 15 mm.

Aluminium strip for lithographic printing plate carriers comprising water-based coatings

Novel aluminum alloy composition and process for producing aluminum rolled semifinished strip material having a grain structure with grain diameters less than about 11 um, and having less than about 5 vol. % of rod shaped intermetallic phases. The present process comprises the steps of homogenizing rolling ingots of the present alloys, hot-rolling and the cold-rolling the ingots without intermediate annealing, and finally annealing the cold-rolled bars having a thickness between about 40 and 250 um.

Rolled thin sheets of aluminum alloy

Production of a thin aluminum alloy strip containing iron, manganese and silicon by hot rolling and cold rolling with a subsequent final annealing, includes the steps of (a) producing a bar by a continuous casting process, from 0.7-1.15% by weight Fe; 0.5-2.0% by weight Mn; and less than 0.6% by weight Si; as well as impurities, none of which exceeds 0.03% by weight, the remainder of the bar being aluminum; (b) homogenizing the bar for 2 to 20 hours at a temperature from 620.degree. to 480.degree. C., after which the bar is (c) hot rolled in a usual manner to a final thickness of 4 mm; then (d) cold rolled without intermediate annealing to a final thickness of 40 to 250 microns; and (e) annealing the cold-rolled strip for 1 to 6 hours at a temperature of 250.degree. to 400.degree. C. The alloy produced has a sub-grain structure, with an average 10 grain diameter of 0.5 to 5 microns, the subgrains constituting at least 50% of the total structure. An alternative embodiment includes the addition of at least one of the following elements: Mg: 0.1-0.8% by weight, Cu: 0.1-0.3% by weight, and Zr: 0.01-0.20% by weight.

Rolled aluminum product and method for its production

Novel aluminum alloy composition and process for producing aluminum rolled semifinished strip material having a grain structure with grain diameters less than about 15 .mu.m, and having less than about 5 vol. % of rod shaped intermetallic phases. The present process comprises the steps of homogenizing rolling ingots of the present alloys, hot-rolling and then cold-rolling the ingots without intermediate annealing, and finally annealing the cold-rolled bars having a thickness between about 40 and 250 .mu.m.

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Bonn, Germany

Jochen Hasenclever