Patent ID: 6932590

Claim:
An apparatus for the continuous production of a spun-bond web, comprising: a spinneret for producing a multiplicity of descending thermoplastic synthetic resin filaments; a device below said spinneret and receiving said multiplicity of descending thermoplastic synthetic resin filaments for aerodynamically stretching same; a continuously movable collecting foraminous belt displaceable longitudinally in a web-producing direction below said device for receiving said filaments to produce a spun-bond web therefrom; and three mutually independently controllable suction zones beneath said belt for drawing air therethrough and in succession in said direction, including a primary suction zone at which a greater part of the filaments are drawn onto said belt a first suction zone upstream of said primary suction zone, and a second suction zone downstream of said primary suction zone, said suction zones having suction speeds which are settable independently of one another, said first zone being separated from said primary zone by a first wall, said second zone being separated from said primary zone by a second wall, said first and second walls being so shaped as to form a nozzle contour with a constriction between them, a spacing between said walls at said constriction being adjustable.