Lenzing Aktiengesellschaft

Hartmut R&uuml;f

Christoph Schrempf

Wilhelm Feilmair

Eduard M&uuml;lleder

The present disclosure relates to novel dyed cellulosic moulded bodies, in particular to fibers or films, containing a heavy-metal-containing colorant, which, according to the thermal stability test described herein, reduces the rise temperature of a cellulose solution in a tertiary amine oxide by 10&deg; C. at most, in particular by 5&deg; C. at most. The moulded bodies according to the disclosure may be produced in accordance with the amine-oxide process.

Dyed cellulosic moulded bodies

The invention relates to a method of producing lyocell-type cellulose fibers by processing a spinnable solution of cellulose in an aqueous tertiary amine oxide according to the dry/wet-spinning process, which method is characterized in that a solution having a content of between 0.05% and 0.70% by mass, based on the mass of the solution, of cellulose with a molecular weight of at least 5&times;10,is used for spinning. The method of the invention allows the use of a spinnerette having more than 10,000 spinning holes for the spinning operation, which holes are arranged in such a manner that neighboring spinning holes are spaced maximally 3 mm apart and that the linear density of the spinning holes it at least 20.

Growing community of inventors

Vöcklabruck, Austria

Hartmut Rüf

Growing community of inventors

Vöcklabruck, Austria

Hartmut R&uuml;f

Hartmut Rüf