Highly bi-axially oriented, heat-shrinkable, thermoplastic,...

B - Operations – Transporting – 32 – B

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B32B 27/30 (2006.01) B29C 55/02 (2006.01) B29C 55/16 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2350764

A bi-axially oriented, heat shrinkable multi-layer film comprising a core layer (A) comprising an ethylene-vinyl alcohol copolymer (EVOH), a first outer layer (B) comprising an ethylene homo- or co-polymer and a second outer layer (C), which may be equal to or different from the first outer layer (B), comprising an ethylene homo- or co-polymer, characterized in that said film has been bi-axially oriented at an orientation ratio in the longitudinal direction higher than 4:1, preferably higher than 4.5:1, more preferably of at least 5:1 and at an orientation ratio in the cross-wise direction higher than 4:1, preferably higher than 4.5:1, more preferably of at least 5:1, is obtained by a process which comprises melt extrusion of the film polymers through a flat die and orientation of the obtained cast sheet simultaneously in the longitudinal and the transversal directions by a simultaneous Center. (See formula I)

L'invention concerne un film multicouche thermorétrécissable à orientation bi-axiale qui comprend: une couche centrale (A) renfermant un copolymère d'éthylène alcool de vinyle (EVOH); une première couche extérieure (B) renfermant un homopolymère ou un copolymère d'éthylène; et une seconde couche extérieure (C), identique ou différente à la première couche extérieure (B), qui renferme également un homopolymère ou un copolymère d'éthylène. Ce film présente une orientation bi-axiale selon un rapport d'orientation dans le sens longitudinal supérieur à 4:1, de préférence supérieur à 4,5:1, et idéalement d'au moins 5:1, ainsi qu'un rapport d'orientation dans le sens transversal supérieur à 4:1, de préférence supérieur à 4,5:1, et idéalement d'au moins 5:1. Le procédé de production de ce film consiste tout d'abord en un filage à chaud des polymères de ce film dans une filière plate, puis en une orientation dans le sens longitudinal et dans le sens transversal de la feuille coulée ainsi obtenue, cette orientation étant effectuée par une rame simultanée.

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