Method of making blown films of cellulose

US6113842A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Peter Weigel · Borchen, DE
• Hans-Peters Fink · Teltow, DE
• Konrad Frigge · Potsdam, DE
• Wolfgang Schwarz · Ludwigshafen, DE

Key dates

• Filing date: Feb 28, 1997
• Grant date: Sep 5, 2000
• Expiry date: Feb 28, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/02
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a method of manufacturing oriented cellulose films by spinning non-derivated cellulose dissolved in amino oxides into a precipitating bath. The cellulose solution is extruded downward through a film-blowing nozzle and an external air gap into the precipitating bath. The spun cellulose film can be inflated after exiting the film-blowing nozzle.