Method and apparatus for making a spunbond

摘要

A method of making a spunbond fleece from continuous filaments wherein at least some of the filaments produced have natural crimp. The filaments are deposited in the deposition station of a conveyor creating a filament mass and the conveyor transports the filament mass toward a consolidating device. A gas stream is produced that flows along the upper surface of the filament mass in the travel direction of the filament mass.

主权项

1. A method of making a spunbond fleece, the method comprising the steps of:
a) spinning continuous filaments at least some of which have natural crimp; b) cooling and stretching the spun continuous filaments in a combined cooling and stretching unit with air drawn in through an air inlet; c) excluding entry of air into the combined cooling and stretching unit except through the air inlet; d) crimping the cooled and stretched continuous filaments in a diffuser downstream of the combined cooling and stretching unit as a primary crimping while passing the cooled and stretched continuous filaments downward between downwardly diverging walls of the diffuser; e) depositing the cooled, stretched, and crimped continuous filaments after exiting the diffuser in an underlying deposition station as a filament mass onto a foraminous conveyor surface moving below the diffuser in a horizontal travel direction at a travel speed; f) sucking air downward through the conveyor surface in a suctioning station at and downstream of the deposition station to retain the mass on the conveyor surface and to vertically compress the mass; g) transporting the mass with the conveyor surface in the direction at the travel speed from the suctioning station to a consolidation station such that upon leaving the suctioning station and before entering the consolidation station at least the filaments with natural crimp undergo secondary crimping and the mass springs up; h) blowing or suctioning a gas stream down onto the mass downstream of the diffuser and upstream of the consolidation station; i) redirecting the gas stream into movement in the direction as and along the mass on the conveyor surface between the deposition station and the consolidation station, parallel to an upper surface of the mass, and at a speed greater than the travel speed of the surface and equal at most to 20% more than the travel speed of the surface so as to stabilize the secondarily crimped filaments; and j) consolidating the mass in the consolidation station.