Polylactic acid shrink films and methods of casting same

Details Polylactic acid shrink films and methods of casting same Polylactic acid shrink films and methods of casting same

B - Operations, Transporting

65

B

B65B 53/00 (2006.01) F16B 4/00 (2006.01)

Patent

CA 2630563

A heat-shrinkable polylactic acid (PLA) film and a method of its manufacture are provided. In an exemplary embodiment, the PLA films exhibit heat-induced shrinkage in the transverse direction with little to no concomitant shrinkage in the machine direction. The films may comprise any grade of PLA polymer, optionally including additives, such as antiblock, slip, plasticizers, viscosity enhancers and combinations thereof. A method of cast and tenner manufacture is disclosed, which includes a temperature conditioning step.

L'invention porte sur un film thermorétractable d'acide polylactique (PLA) et sur son procédé de fabrication. Dans une exécution, de tels films présentent sous l'effet de la chaleur une rétraction transversale et peu ou pas de rétraction dans le sens machine. Les films comprennent tout grade de polymère PLA incluant facultativement des additifs tels que des antiadhérents, des agents glissants, des plastifiants, des renforceurs de viscosité ou leurs combinaisons. L'invention porte également sur une méthode de moulage puis de traitement tenner, qui inclut une étape de conditionnement de la température.

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