Heat-shrinkable multilayer packaging film comprising inner...

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/08 (2006.01) B32B 27/32 (2006.01) B32B 27/36 (2006.01) B32B 27/40 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2321084

A heat-shrinkable multilayer film comprises (A) a first layer, which is an outer layer, and which comprises polyolefin; (B) a second layer comprising at least one member selected from the group consisting of polyolefin, polystyrene, and polyurethane; (C) a third layer comprising at least one member selected from the group consisting of amorphous polyester and polyester having a melting point of from about 130 °C to about 260 °C; (D) a fourth layer, which is an outer layer, the fourth layer comprising at least one member selected from the group consisting of polyester, polyamide and polyurethane. The first layer preferably serves as a seal layer in a heat-shrinkable bag. The third layer provides enhanced impact strength, optics, grease-resistance, and free-shrink of the film, and renders the tape more easily orientable. The high melting polyester, polyamide, and/or polyurethane of the fourth layer permits at least two bags, having product therein, to be stacked on top of one another and sealed simultaneously, without sticking to one another, thereby doubling the output of a vacuum chamber machine. A bag and a process of making a packaged product are also disclosed.

L'invention porte sur un film thermorétractable multicouche comprenant: (A) une première couche extérieure de polyoléfine; (B) une deuxième couche comportant au moins un élément sélectionné parmi une polyoléfine, un polystyrène et un polyuréthane; (C) une troisième couche comportant au moins un élément sélectionné parmi un polyester amorphe ou un polyester présentant un point de fusion compris entre 130 et 260 DEG C; (D) une quatrième couche également extérieure comportant au moins un élément sélectionné parmi un polyester, un polyamide et un polyuréthane. La première couche sert de préférence de couche étanche de sac thermorétractable, la troisième couche présente une résistance renforcée aux chocs et aux graisses, la qualité optique, et la liberté de rétraction, tout en facilitant l'orientation de la bande. Quant à la quatrième couche de polyester, polyamide et/ou polyuréthane, à point de fusion élevé, elle permet d'empiler au moins deux sacs remplis et de les thermosceller sans coller l'un à l'autre, ce qui double le rendement de la machine à chambre à vide. L'invention porte également sur un sac et un procédé d'élaboration de produits emballés.

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