Verfahren und Vorrichtung zur Herstellung einer elastischen, mehrschichtigen Materialbahn

摘要

A process is disclosed for producing an elastic, multilayer material web made of a flexible, elastic carrier foil made of a thermoplastic elastomer and of corrugated nonwoven webs secured to the top and lower side of the carrier foil and soldered to each other. The solders are designed as spot-welding surfaces distributed in a grid over the material web and form at the same time areas of increased air permeability through the material web. The process comprises the following steps: (a) feeding and stretching the carrier foil up to at least (100 + a) % of the non-stretched length, (100 % standing for the non-stretched web); (b) separately feeding and stretching two nonwoven webs (11; 12) up to (100 + b) % and (100 + c) %, while respecting the following inequality: b < c < a, whereas the difference between the extent of stretching of the webs is large enough to corrugate the nonwoven webs, and joining the webs into a sandwich structure constituted of the central carrier foil and of the outer nonwoven webs; (c) soldering the nonwoven webs to the carrier foil by means of a cylinder carrying soldering points which is a part of a soldering station; (d) relaxing the carrier foil, to which the nonwoven webs are soldered, after it leaves the soldering station.