Label film

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 5/18 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2758758

The invention relates to a multilayered, opaque, biaxially oriented polyolefin film having a thickness of at least 30 µm consisting of a vacuole-containing base layer and intermediate layers applied to both sides thereof, and cover layers applied to either side of the intermediate layers. Both intermediate layers have a thickness of at least 3 µm and contain at least 70% by weight of a propylene homopolymer. Both cover layers are constructed from incompatible polymers. The inner cover layer has a surface roughness Rz of at least 3.0 µm and the outer cover layer has a roughness from 1 to 3 µm, the roughness of the inner cover layer being at least 1.5 units greater than the roughness of the outer cover layer.

L'invention concerne une feuille en polyoléfine multicouche, opaque, orientée biaxiale, d'une épaisseur d'au moins 30µm, constituée par une couche de base formée de vacuoles et par des couches intermédiaires appliquées des deux côtés, et des couches de recouvrement des deux côtés. Les deux couches intermédiaires ont une épaisseur d'au moins 3µm et renferment au moins 70% en poids d'un homopolymère de propylène. Les deux couches de recouvrement sont formées de polymères incompatibles. La couche de recouvrement intérieure présente une rugosité superficielle Rz d'au moins 3,0µm et la couche de recouvrement extérieure une rugosité de 1 à 3µm, la rugosité de la couche de recouvrement intérieure étant supérieure, d'au moins 1,5 unité à la rugosité de la couche de recouvrement extérieure.

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