Schlauchfolien aus Cellulose-Protein-Blends

Die Erfindung betrifft ein Verfahren zur Herstellung orientierter Schlauchfolien durch Extrusion einer Spinnloesung mittels einer Ringduese ueber einen aeusseren Luftspalt in ein Fuellbad. Die Spinnloesung besteht aus einer Loesung einer Mischung von Cellulose und Protein in einem NMMO-Wassersystem.

WO 200145917 A UPAB: 20010927 NOVELTY - Oriented tubular films are manufactured by using a spinning solution comprising a homogeneous solution of a mixture of cellulose and protein(s) in an n-methylmorpholine-n-oxide (NMMO)-water system. DETAILED DESCRIPTION - Manufacture of oriented tubular films includes extrusion of a spinning solution using a ring nozzle over an external air gap into a precipitation bath. The spinning solution includes a homogeneous solution of a mixture of cellulose and protein(s) in NMMO-water system. The homogeneous solution is produced by withdrawing the water of the solution until both the cellulose and protein are dissolved completely. USE - The invention is used to manufacture oriented tubular films used as biodegradable and compostable packaging materials (claimed). Particularly, the films are used as sausage skins for hard sausages, and as peelable skins (claimed). ADVANTAGE - The invention provides strong and flexible tubular films, which make expensive after treatment or surface treatment unnecessary.