PURPOSE: To obtain polyethylene multifilament yarn free from adherence between single yarn, using a proper spinning bath, taking up yarn at a proper speed and extracting and removing a remaining solvent in the coagulated yarn with an extractant.
CONSTITUTION: 1W20wt% (preferably 3W10wt%) solution of a polyethylene having ≥700,000 (preferably ≥2,000,000) weight-average molecular weight is extruded from a spinning nozzle. Yarn is passed through an inert gas layer and a spinning bath of two layer structure having an upper layer of a cooling agent uncompatible with a solvent and a lower layer of a coabulating agent (higher specific gravity than cooling agent) compatible with the solvent and uncompatible with the cooling agent. The yarn is taken up at ≥10m/min speed and the solvent in the yarn is successively extracted and removed with an extractant. The depth of the upper layer of the spinning bath satisfied the formula.
NISHIKAWA YUTAKA
FUJIOKA KOTARO
