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Improved Wear Characteristics of Spin Coated Disks

IP.com Disclosure Number: IPCOM000076060D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brock, GW: AUTHOR [+2]

Abstract

It is often noted that there is a preferential direction of coating on a spin-coated, ink-coated substrate which affects wear. In essence, if the wear direction is with the grain of the coating, the coating wears better; conversely if the wear direction is against the grain, the coating wears poorer. This can be controlled by controlling the direction of spin coating of the disk. Usual horizontal spin coating coats one side of the disk at a time, coating in the same direction each time. Thus each side of the disk has an opposite grain direction. When the disk is subsequently used on a drive, one of the grain directions is advantageous for wear while the other is poor for wear.

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Improved Wear Characteristics of Spin Coated Disks

It is often noted that there is a preferential direction of coating on a spin-coated, ink-coated substrate which affects wear. In essence, if the wear direction is with the grain of the coating, the coating wears better; conversely if the wear direction is against the grain, the coating wears poorer. This can be controlled by controlling the direction of spin coating of the disk. Usual horizontal spin coating coats one side of the disk at a time, coating in the same direction each time. Thus each side of the disk has an opposite grain direction. When the disk is subsequently used on a drive, one of the grain directions is advantageous for wear while the other is poor for wear. To alleviate this, the spin coating technique is altered so that when the top surface of the disk is spin coated in one direction, the second side is spin coated in the opposite direction resulting in both surfaces having desirable spin directions. Subsequent polishing treatments are also applied as to apply the same direction of grain to both surfaces.

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