Verfahren zur Herstellung von Cellulosefasern und die mit diesem Verfahren hergestellten Fasern

Abstract

Production of flexible cellulose fibres involves spinning cellulose solutions through spinnerets through an air gap into an aqueous and/or alcoholic coagulation bath containing amine oxide and then drying. The novelty is that, before drying, the moist spun fibre is passed through after-treatment bath(s) containing water and water-miscible alcohol(s), diol(s) and/or triol(s) and washing bath(s) containing water, an alkanol, a diol or a triol. Also claimed are cellulose fibres made by this method, which have an initial modulus < 1500 cN/tex. Preferably the after-treatment bath is alkaline and especially consists of a mixture of alkanol and aqueous sodium hydroxide (NaOH) solution, more especially ethanol (EtOH) and 1-30% aqueous NaOH solution. The washing bath contains EtOH. ADVANTAGE - The orientation, modulus, brittleness and tendency of the fibres to fibrillate are all reduced compared with the usual fibres spun from solutions in amine oxides, especially N-methylmorpholine N-oxide (NM MNO), or aqueous NMMNO