METHOD AND DEVICE FOR STRENGTHENING A RUNNING FLEECE WEB, AND FLEECE

摘要

The invention relates to a method and a device for strengthening a running fleece web. For this purpose, the fleece web is penetrated by a plurality of fluid streams. In order to create a surface structure, the fluid streams are generated by a movable nozzle beam which is guided back and forth substantially perpendicular to the direction of travel of the fleece web at a certain amplitude. In order to obtain enough flexibility and a sufficient volume in the fleece web in spite of the strengthening process, the amplitude for moving the fluid streams back and forth is selected such that the points of impact created in the fleece web by adjacent fluid streams do not intersect a theoretical separation line in the direction of travel. To this avail, the amplitude of the fore-and-aft movement of the nozzle beam is adjusted so as to be smaller than half the distance between two nozzle ports lying next to each other in the row.