Patent ID: 7842208
Filing Date: 2010-11-30
Classification: D01D,D01F

Abstract:
1. Method for spinning a multifilament yarn from a thermoplastic material comprising the steps of extruding the melted material through a spinneret to form a filament bundle comprising a plurality of filaments and winding the filament bundle as a multifilament yarn after solidifying, said spinneret having a plurality of spinneret holes and the ends of the holes at which the filaments emerge forming a spinneret hole outlet plane, and with the filament bundle first being cooled below the spinneret in a first cooling zone by means of at least one transverse blowing operation with a gaseous cooling medium and by means of suction on the opposite side to the transverse blowing operation, and then in a second cooling zone below the first cooling zone the filament bundle being further cooled by self suction of gaseous cooling medium in the vicinity of the filament bundle, in the first cooling zone the at least one transverse blowing operation occurs via a blowing section AC of length L with the blowing section AC having an upper leading end A facing towards the spinneret holes and a lower trailing end C facing away from the spinneret holes, and that the blowing section AC is arranged opposite a section BD having a leading end B facing towards the spinneret holes and a trailing end D facing away from the spinneret holes, and that the imaginary line AB between A and B runs parallel to the spinneret hole outlet plane, with section BD having a length L and section BD being divided into an open suction section BX with the length L BX via which the gaseous cooling medium is sucked away and a closed section XD having a length L XD , with the L XD : L XD ratio lying in the range between 0.15: 1 and 0.5 : 1.