Verfahren und Vorrichtung zur Herstellung einer elastischen, mehrschichtigen Materialbahn

摘要

PCT No. PCT/EP93/03187 Sec. 371 Date Oct. 26, 1994 Sec. 102(e) Date Oct. 26, 1994 PCT Filed Nov. 13, 1993 PCT Pub. No. WO94/11189 PCT Pub. Date May 26, 1994Process for producing an elastic multilayer web of material consisting of a flexible elastic backing film made of a thermoplastic elastomer and a web of nonwoven material bonded in a crepe-like manner to both the top and bottom sides of the backing film, whereby the webs of nonwoven material are welded together and the weld bonds are distributed over the web of material in the form of a grid arrangement of spot welding points and at the same time yield areas of increased air permeability through the web of material. The following process steps are carried out: a) guiding and stretching the backing film to at least (100+a) % of the unstretched length, b) separately guiding and stretching two webs of nonwove (11 and 12) to certain dimensions (100+b) % and (100+c) % while maintaining the following conditions: b