Verfahren und Vorrichtung zur Herstellung einer Faserbahn mit transversaler Ausrichtung

摘要

A transversely aligned web (18) is produced by aligning filaments spun at a high rate. Initially, a melted resin is extruded downwardly from a spinning nozzle (1) having an inner diameter of 0.6mm or more provided above a conveyor (19). A primary airflow at a high temperature is blown off in the gravitational direction from an annular primary airflow nozzle (2) having a diameter of 2.5mm or more provided so as to concentrically surround the open end of the spinning nozzle (1). The extruded melted filament is vibrated by the primary airflow (2). A secondary airflow at a high temperature is blown off from a pair of secondary airflow nozzles (4a) provided on the upstream side and downstream side of the running direction of the conveyor toward the extruded and vibrated melted filament. The secondary airflows blown off from the pair of secondary airflow nozzles (4a) collide with each other below the spinning nozzle (1), spreading in the width direction of the conveyor (19), whereby the extruded melted filament is spread in the width direction of the conveyor (19). Thus, filaments deriving from solidifying the extruded melted filament can be spun at a spinning rate of 30000 m/min. or more. The resulting filaments are aligned in the width direction of the conveyor (19) and piled on the conveyor (19).