Heat-shrinkable, irradiated, polyethylene mono-layer film

B - Operations – Transporting – 29 – C

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Details

B29C 55/12 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2359323

A process of manufacturing a heat-shrinkable polyethylene mono-layer film with a thickness variation of less than 20 %, preferably less than 18 % and even more preferably less than 15 %, which process comprises extrusion of the film resin through a flat die, quenching of the cast extruded sheet, irradiation thereof, re-heating to the suitably selected orientation temperture and stretching of the irradiated sheet. Preferably the polyethylene comprises an ethylene-.alpha.-olefin copolymer. The heat-shrinkable polyethylene mono-layer irradiated film with a thickness variation of less than 20 %, preferably less than 18 % and even more preferably less than 15 % is also claimed.

L'invention concerne un procédé de fabrication d'une pellicule de polyéthylène, monocouche, thermorétractable, dont la variation en épaisseur est inférieure à 20 %, de préférence inférieure à 18 % et idéalement inférieure à 15 %. Ce procédé comprend les étapes consistant à extruder la résine de la pellicule à travers une filière plate, à refroidir rapidement la feuille extrudée moulée, à la soumettre à un rayonnement, puis à la chauffer à nouveau jusqu'à une température d'étirage correctement choisie, et à étirer la feuille ayant subi le rayonnement. De préférence, le polyéthylène comprend un copolymère d'éthylène- alpha -oléfine. L'invention concerne encore une pellicule de polyéthylène, monocouche, thermorétractable, soumise à un rayonnement, et dont la variation en épaisseur est inférieure à 20 %, de préférence inférieure à 18 % et idéalement inférieure à 15 %.

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