Blank for magnetic hard disk and method for producing same

Details Blank for magnetic hard disk and method for producing same Blank for magnetic hard disk and method for producing same

1997-01-16

1999-10-12

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 656, 428141, 428694ST, 428694SG, 428900, 427127, 427128, 427129, 427130, 427131, 427307, G11B 566

Patent

active

059652306

ABSTRACT:
A blank for magnetic hard disk and a method for producing the same are provided, characterized in that the attachment or adhesion of a blank of a disk shape to each other can be prevented when such blank is stacked together for disk annealing, thereby improving the productivity of magnetic hard disk, and that the damage of blank surface can be prevented during blanking. Firstly, an aluminium alloy plate is subjected to continuous surface washing process with an etching solution while winding off the aluminium alloy plate in a coil, whereby the oxide film on the surface of the aluminium alloy plate is removed to concurrently deposit insoluble smut on the surface. Then, the aluminium alloy plate after the washing process is pressed for blanking thereof into a blank of a disk shape.

REFERENCES:
patent: 4925738 (1990-05-01), Tsuya
patent: 5122423 (1992-06-01), Hose
patent: 5470636 (1995-11-01), Wokui

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