Lenzing Aktiengesellschaft

Lenzing Aktiengeselleschaft

Hartmut Ruf

Raimund Jurkovic

Stefan Zikeli

Friedrich Ecker

Franz Schwenninger

Ernst Rauch

Hermann Koberger

Christoph Schrempf

Rainer Wolf

Gert Kroner

Dieter Eichinger

Markus Eibl

Wilhelm Feilmair

Gabriele Schild

Clemens Bisjak

Regenerated cellulose incorporating phosphorus compounds so as to be

To prepare cellulose mouldings, a solution of cellulose in a tertiary amine-oxide is moulded in a hot state and the moulded solution is introduced into a precipitation bath in order to precipitate the contained cellulose, wherein the hot moulded solution is cooled before introduction into the precipitation bath. Cooling occurs immediately after the moulding process and preferably consists of blowing air horizontally on to the cellulose moulding. The process according to the invention allows spinning of the cellulose solution with a high fiber density without the spun fibers sticking together after emerging from the spinneret. In spite of the high fiber density, it furthermore allows the use of a long air gap between the spinneret and the precipitation bath, by which means sufficient time is generated in the spinning process to affect the textile properties of the fibers by drawing at the die (FIG. 1).

Process of making cellulose moldings and fibers

Process for the manufacture of cellulose fibres

Process for manufacturing cellulose moulded bodies

Apparatus for the preparation of cellulose fibers from a solution of cellulose in a tertiary amine oxide includes a spinneret having a multiplicity of spinning holes arranged essentially in a ring-shape. An inlet for cooling gas is positioned in the center of the ring-shape arrangement of the spinning holes and immediately downstream of the spinning holes. The inlet comprises a tube having a baffle plate at one end.

Device for the preparation of cellulose mouldings

To prepare cellulose fibres, a solution of cellulose in a tertiary amine-oxide is shaped in hot condition to give filaments, the filaments are cooled and then introduced into a precipitation bath in order to precipitate the dissolved cellulose, whereby the shaped solution is exposed to an essentially laminar gas stream (FIG. 2a) for cooling before introduction into the precipitation bath.

Process of making cellulose fibres

The invention is concerned with a process for the production of cellulose fibres, wherein a solution of cellulose in an aqueous tertiary amine-oxide is extruded into filaments through spinning holes of a spinneret and the extruded filaments are conducted across an air gap into a substantially aqueous precipitation bath, characterized in that the extruded filaments, while being conducted across the air gap, are contacted with an aliphatic alcohol which is present exclusively in gaseous state. The process according to the invention produces cellulose fibres having a very reduced tendency to fibrillation.

Process for the production of cellulose fibres

Process of and apparatus for making cellulose mouldings

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Vocklabruck, Austria

Hartmut Ruf