Laminate of thermoplastic film materials exhibiting...

B - Operations – Transporting – 32 – B

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B32B 38/04 (2006.01) B29C 55/18 (2006.01) B32B 38/18 (2006.01)

Patent

CA 2594263

A laminate of thermoplastic film materials exhibiting throughgoing porosity and comprising plies A and B, A having an inner surface A1 partly in contact with B and an outer surface A2, and B having an inner surface B1 partly in contact with A and an outer surface B2, A and B consisting of continuous material except for a multitude of perforations (6) in each ply, whereby essentially no perforation in A corresponds directly to a perforation in B, the lamination between A and B on surfaces A1 and B1 being a) through a coextruded lower melting lamination layer (3,4) on A and/or B and b) established in such discontinuous manner that there is formed a channel system between Al and Bl connecting the majority of the perforations (6) in A each with at least one of the perforations (6) in B, and connecting the majority of the perforations in B each with at least one of the perforations in A is provided in addition to a process and apparatus for producing such a laminate.

L'invention concerne un stratifié de matières de film thermoplastique présentant une porosité traversante et qui comprennent des couches A et B. A comporte une surface intérieure A1 partiellement en contact avec B, et une surface extérieure A2; et B comporte une surface intérieure B1 partiellement en contact avec A, et une surface extérieure B2. A et B sont constitués d'une matière continue, chaque couche étant néanmoins pourvue d'une multitude de perforations, et essentiellement aucune perforation de A ne correspond directement à une perforation de B. La stratification entre A et B, sur les surfaces A1 et B1 est: a) obtenue par l'intermédiaire d'une couche stratifiée à point de fusion inférieur, formée par coextrusion sur A et/ou B; et b) établie de manière discontinue de sorte qu'un système de canal, formé entre A1 et B1, relie la majeure partie des perforations de A avec au moins une des perforations de B, ainsi que la majeure partie des perforations de B avec au moins une des perforations de A. L'invention concerne aussi un procédé et un dispositif permettant de produire ce stratifié.

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