Patent ID: 6495078
Filing Date: 2002-12-17
Classification: B05B,B05C,D01D,D04H

Abstract:
A method of producing a transversely aligned web comprising the steps of:extruding melted resin from a spinning nozzle having an inner diameter of 0.6 mm or more at the opening end thereof which is provided above a conveyor running in one direction so that the melted resin is directed downwardly at an extruding rate of 30 g/min. or more; blowing off a primary airflow at a high temperature and at high velocity from a annular primary airflow nozzle having a diameter of 2.5 mm or more which concentrically surrounds the opening end of the spinning nozzle, in the gravitational direction toward the conveyor so that a melted filament extruded from the spinning nozzle is vibrated by the primary airflow; blowing off a pair of secondary airflows at a high temperature from a pair of secondary airflow nozzles respectively toward the melted filament extruded from the spinning nozzle with vibration owing to the primary airflow, the pair of secondary airflow nozzles being located on the upstream side and downstream side of the conveyor with respect to the extruded melted filament, respectively, colliding with the pair of airflow blown off from the pair of secondary airflow nozzles each other below the spinning nozzle, spreading the colliding secondary airflow at least partly in the width direction of the conveyor so that the extruded melted filament with vibration is spread in the width direction of the conveyor, thus spinning filaments deriving from the extruded melted filament with vibration at a rate of 30000 m/min. or more; and piling on the conveyor the spun filaments spread in the width direction of the conveyor so that transversely aligned web is formed of the filaments which are aligned in the width direction of the conveyor.