Method and device for producing a spunbonded nonwoven fabric

#1. Field of the Invention

#The present invention relates to various methods and devices for producing spunbonded nonwoven fabrics.

#2. Description of Related Art

#The present invention will be described in greater detail, with reference to the following drawings, wherein:

#FIG. 1 is a schematic representation of the method sequence according to the invention,

#FIG. 2 is a schematic representation of the blowing duct with deflected filament sheet according to the invention,

#The invention is based on a method for producing a spunbonded nonwoven fabric by extruding a linear sheet of filaments arranged parallelly side by side in the form of a curtain from a plurality of spinning capillaries, involving aerodynamical pulling off and drawing of the filament sheet. According to the present invention, the filament sheet which emerges from the drawing duct or which is pulled off a spool is moved laterally crosswise by an air flow having periodically changing directions, the air flow being oriented alternately at an angle toward the filament sheet as viewed in the horizontal plane. Discrete air puffs in changing directions cause the filament sheet to be moved to and fro crosswise to the production direction, resulting in the desired nonwoven fabric pattern, for example, high uniformness in the pattern.

#The air puffs can be alternately carried out from the left and from the right. It has turned out to be advantageous if air pauses are inserted between the individual air flows during which no air puff is present and which allow the filament sheet to align vertically between the air puffs.

#The general blow-out direction of the air flows is directed perpendicularly toward the filament sheet. In this context, a blow-out angle of 15° in the horizontal plane is selected. Other blow-out angles are, of course, possible as required. It is also possible for the blow-out direction to be angularly aligned downwards toward the filament sheet in the vertical plane. The blow-out angle in the vertical plane can be 15°.