Patent ID: 8029589
Filing Date: 2011-10-04
Classification: B01D,B29C,B29K,B29L,Y10S

Abstract:
1. Method for connecting a filter medium to a separately formed V-shaped flap or strip-shaped connection element, the filter medium and the connection element being brought into contact with one another and being connected to one another as a result of the action of laser radiation from a laser radiation source, the filter medium comprising a folded sheet-like layer of thermoplastic nonwoven including folded pleats and fold end faces, the separately formed connection element comprising a thermoplastic nonwoven, wherein at least one separately formed connection element is connected to the fold end faces of the sheet-like layer, the separately formed connection element being pressed against the filter medium and providing a contact point, wherein either one or the other of the separately formed connection element or the filter medium absorb said laser radiation and melt and flow into the thermoplastic nonwoven of the other material and said contact point has a fused region depth of 1 mm or less and does not include a compressed region or permanent deformation as between said contact point and said filter medium.