Metallised opaque film with barrier properties

Details Metallised opaque film with barrier properties Metallised opaque film with barrier properties

B - Operations, Transporting

32

B

B32B 27/32 (2006.01) B32B 27/20 (2006.01)

Patent

CA 2516587

The invention relates to a metallised, coextruded, multi-layered, biaxially orientated polypropylene multi-layer film comprising a base layer containing vacuoles. Said base layer containing vacuoles is covered by one or several layers and the thickness of said covering layer or layers is, in total, at least 3~m and the film on the outer surface of said covered layer or layers are metallised and the metallised film has a water vapour permeability of = 0,5 g/m2* day at 38 ~C and 90 % relative air humidity and oxygen permeability of =50 cm3/m2*day*bar at 23 ~C and 50 % relative air humidity.

L'invention concerne une feuille de polypropylène multicouche à orientation biaxiale coextrudée et métallisée, comportant une couche de base vacuolaire recouverte par une ou plusieurs couches, l'épaisseur de cette ou ces couches de recouvrement s'élevant au total à au moins 3 ?m. La feuille est métallisée sur la surface extérieure de cette ou ces couches de recouvrement et cette feuille métallisée présente une perméabilité à la vapeur d'eau = 0,5 g/m?2¿*jour à 38 ·C et 90 % d'humidité atmosphérique relative ainsi qu'une perméabilité à l'oxygène = 50 cm?3¿/m?2¿*jour*bar à 23 ·C et 50 % d'humidité atmosphérique relative.

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