Multi-layer hermetically sealable film

B - Operations – Transporting – 32 – B

Patent

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B32B 27/32 (2006.01)

Patent

CA 2389038

A multi-layer film has an improved composite structure for providing hermetic seals to packages manufactured in high speed packaging apparatus. The structure of the multi-layer film includes layers A/B/C/D. Skin layer A is formed from polypropylene copolymer with melt flow rate greater than one or linear high density polyethylene with melt index greater than one. Core layer B is formed from polypropylene. Intermediate layer C has the primary function of compliance during sealing, and sealing layer D has the primary function of providing adhesitivity to the completed seal. The sealing layer D includes an antiblocking agent comprising non-distortable organic polymer particles having an average particle size greater than 6 microns.

L'invention concerne un film multi-couche qui comporte une structure composite améliorée conçue pour fournir des fermetures hermétiques à des emballages fabriqués par un appareil d'emballage à grande vitesse. La structure du film multi-couche comprend des couches A/B/C/D. La couche superficielle A est constituée d'un copolymère polypropylène ayant un indice de fluidité supérieur à un ou un polyéthylène à forte densité ayant un indice de fluidité supérieur à un. La couche noyau B est constituée de polypropylène. La fonction première de la couche intermédiaire C est d'être flexible au cours de la fermeture hermétique, et la fonction première de la couche hermétique D est de fournir une adhésivité à la fermeture hermétique achevée. Cette couche D comprend un agent antiadhérent renfermant des particules polymères organiques indéformables ayant une taille particulaire moyenne supérieure à 6 microns.

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