Browse Prior Art Database

Stabilized Flexible Disks

IP.com Disclosure Number: IPCOM000081809D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bartkus, EA: AUTHOR [+3]

Abstract

Dimensional stability and mechanical durability of flexible polymer disks are improved utilizing the following techniques.

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This is the abbreviated version, containing approximately 66% of the total text.

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Stabilized Flexible Disks

Dimensional stability and mechanical durability of flexible polymer disks are improved utilizing the following techniques.

In one method, a polymeric disk substrate material is fabricated having molecular and crystal orientation radially symmetrical about a point, by control of process parameters during film formation. This is accomplished by forming the disk from molten or dissolved polymer, which is cast upon a rotating surface. The rotating surface generates centrifugal forces which are transmitted as stress to the polymer during casting, causing the polymer's molecular and/or crystal structure to orient radially from the center of rotation.

The polymer is then solidified under controlled conditions of time and temperature, to optimize its preferred radial orientation. Subsequently, the polymer is removed from the surface upon which it was cast. Where material is cast in this manner, the surface topography of the polymer is of the same character as that of the surface upon which it was cast.

In a modification of this process, reinforcing or magnetic particles are included in the molten or dissolved polymer before or during casting. The reinforcing particles are in the form of short fibers or acicular particles. In the same manner in which the polymer is forced to flow radially, due to centrifugal force generated by the rotating substrate, the reinforcing fibers are caused to orient radially in the structure. Such reinforcement minimiz...