B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/36 (2006.01) B32B 27/30 (2006.01) B32B 27/32 (2006.01)
Patent
CA 2533694
The invention relates to a high modulus, bi-axially oriented film, heat- shrinkable or non heatshrinkable, comprising a first outer layer comprising a polyester or a copolyester, a second outer layer comprising an ethylene or propylene homo- or co-polymer, a core layer comprising an ethylene-vinyl alcohol copolymer, and no core polyamide or polyester layers. The film according to the present invention is prepared by orienting biaxially a flat extruded tape by means of a tenter frame, preferably simultaneously, and has a modulus higher than 6,000 kg/cm2 in at least one direction. The film of the present invention is particularly useful, in the non heat-shrinkable version, for food and non food packaging applications.
L'invention concerne un film à orientation biaxiale, à haut module, thermorétractable ou non thermorétractable, qui comporte : une première couche extérieure comprenant un polyester ou un copolyester ; une deuxième couche extérieure comprenant un homopolymère ou un copolymère éthylène ou propylène ; une couche centrale comprenant un copolymère éthylène-alcool vinylique ; et aucune couches centrale polyamide ou polyester. Ledit film est préparé par orientation biaxiale d'une bande extrudée plate au moyen d'une rame, de préférence simultanément, et présente un module supérieur à 6000 kg/cm?2¿ dans au moins un sens. Ledit film s'avère particulièrement utile, dans la version non thermorétractable, pour des applications de conditionnement, alimentaire ou pas.
Forloni Roberto
Longo Eugenio
Cryovac Inc.
Smart & Biggar
LandOfFree
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