B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/20 (2006.01) B29C 43/22 (2006.01) B29C 47/88 (2006.01)
Patent
CA 2677970
The invention relates to an transmission-opaque thermoplastic multilayered sheet having a volumetric mass lower than or equal to 1 g/cm3 and a thickness lower than or equal to 500 µm, each of the faces thereof having a uniform surface appearance, said sheet including at least three extruded layers, i.e. an opaque inner layer (2) and at least two outer layers (3, 4) of a thermoplastic material and not totally opaque, said inner layer (2) including a thermoplastic material and an opacifying load. The invention further relates to a method for making such an opaque thermoplastic sheet (1), that comprises a coextrusion step and a pressing-cooling-finishing step of said coextruded polymer (5) between a cooling cylinder (7) and an endless strip (8) imparting the required thickness and the uniform surface appearance to sad sheet (1). The invention further relates to its application to various sheets, in particular hanging posters, play cards or scratch cards.
L'invention concerne une feuille (1) multicouche thermoplastique opaque en transmission, ayant une masse volumique inférieure ou égale à 1 g/cm3 et une épaisseur inférieure ou égale à 500 µm, chacune de ses faces ayant un aspect de surface uniforme, ladite feuille comprenant au moins trois couches extradées dont une couche interne (2) opaque et au moins deux couches externes (3,4) en matière thermoplastique non totalement opaques, ladite couche interne (2) comprenant une matière thermoplastique et une charge opacifiante. L'invention concerne également le procédé de fabrication d'une telle feuille (1) thermoplastique opaque comprenant une étape de coextrusion et une étape de <= pressage-refroidissement-finition >= dudit polymère coextrudé (5) entre un cylindre refroidisseur (7) et une bande sans fin (8) conférant l'épaisseur requise et l'aspect de surface uniforme à ladite feuille (1). Elle concerne aussi son application à diverses feuilles notamment des affiches suspendues ou des cartes à jouer ou des cartes à gratter.
Goudreau Gage Dubuc
Priplak
LandOfFree
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