Filamentary nonwoven bandage fabric

US7361241B2 · kind B2 · utility

Assignees

• Fleissner GmbH · DE
• Georg Barth · DE
• Edmund Hugh Carus · GB

Inventors

• Georg Barth · Rengsdorf, DE
• Edmund Carus · Darwen, GB

Key dates

• Filing date: Feb 5, 2004
• Grant date: Apr 22, 2008
• Expiry date: Apr 17, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/697
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In order to produce a nonwoven fabric having elastomeric properties spun filaments (1), consisting preferably (but not essentially) of cellulose material such as cellulose acetate or solvent spun rayon, not in yarn formats, are corrugated or crimped in an overfeed process, as in stuffer box (6), into stabilized three dimensional batts. A proportion of filaments (3) of a thermal memory material, such as modified polyester, in a stretched format are included. The resulting batt is then subjected to controlled hydroentangling and a controlled heat treatment to yield three dimensional nonwoven fabrics with elastomeric properties due to contraction of the stretched filaments. Elastomeric memory material activated to shrink by ultrasonic treatment may be used in place of thermal memory material. The elastomeric properties can be adjusted to suit end-use requirements and applications are envisaged in the medical and hygiene areas.