Method for extrusion coating multiple webs

B - Operations – Transporting – 29 – C

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Details

B29C 47/00 (2006.01) B05D 1/26 (2006.01) B32B 27/10 (2006.01) B32B 37/24 (2006.01) B29C 47/14 (2006.01) B29C 47/88 (2006.01) D21H 23/46 (2006.01)

Patent

CA 2463763

A method for extrusion coating multiple webs by an extrusion system having multiple extrusion stations (34, 50). The method includes an initial step of providing a first web (10) and a second web (12) wherein each web has a coating side and an underside. The webs are temporarily joined to fom a composite web (32) wherein the respective coating sides face outward and the respective undersides face one another. A first polymer coating (36) is extruded on the coating side of the first web (10) at a first extrusion station (34). Subsequently, a second polymer coating (52) is extruded on the coating side of the second web (12) at a second extrusion station (50). The extrusion coated first and second webs are then separated.

L'invention concerne un procédé de revêtement par extrusion de plusieurs bandes continues au moyen d'un système d'extrusion comportant plusieurs postes d'extrusion (34, 50). Le procédé consiste d'abord à mettre en oeuvre une première bande continue (10) et une seconde bande continue (12), chaque bande continue présentant une face de revêtement et une face inférieure. Les bandes continues sont temporairement affrontées pour former une bande continue composite (36) de sorte que les faces de revêtement respectives soient tournées vers l'extérieur et les faces inférieures respectives placées en vis-à-vis. Un premier revêtement polymérique (36) est extrudé sur la face de revêtement de la première bande continue (10) au niveau d'un premier poste d'extrusion (34). Un second revêtement polymérique (52) est ensuite extrudé sur la face de revêtement de la seconde bande continue (12) au niveau d'un second poste d'extrusion (50), après quoi la première bande continue et la seconde bande continue revêtues par extrusion sont séparées.

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