Jacket for a flexible magnetic disk and production of the jacket

US4822327A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernhard Lenz · Frankfurt, DE
• Kurt Zwintzscher · Kehl, DE
• Dietrich Gruehn · Appenweier, DE
• Hubert Fehrenbach · Kehl, DE
• Norbert Holl · Germering, DE

Key dates

• Filing date: Mar 22, 1988
• Grant date: Apr 18, 1989
• Expiry date: Mar 22, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T156/1051
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The blanks punched out from a film web and folded to form the jacket are then heated for a short time and cooled again in order to eliminate stresses in the jacket material which give rise to deformations and are also produced by the action of heat during processing of the material.