Stretched laminated film and bag

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/08 (2006.01) B65D 30/02 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2677899

A stretched laminated film and bag is provided, in which a packaging operation in thermal shrinkage packaging is effectively performed without the occurrence of fusion and the like between margins when sealing via heat-sealing with a margin portion of an adjacent bag in a layered state, and without of bag whitening in a thermal shrinkage process thereafter. Specifically, a stretched laminated film has at least four layers of: a surface layer (A), an adhesive layer (A), a barrier layer, and a surface layer (B) sequentially laminated in order thereof, in which the melting temperature of the surface layer (A) is only increased no less than 65°C to no more than 150°C higher than the melting temperature of the surface layer (B), and the barrier layer is composed of a vinylidene chloride copolymer, and the melting temperature of the barrier layer is no less than 130°C to less than 160°C.

L'invention concerne un film stratifié étiré donnant un sac qui, lorsqu'il est thermoscellé dans un emballage par thermorétraction dans l'état dans lequel une partie de jeu du sac recouvre une autre, est exempt de liaison par fusion des parties de jeu les unes aux autres, etc. et permet une opération d'emballage efficace et qui ne souffre d'aucun trouble dans une étape de thermorétraction ultérieure. Le film stratifié étiré est composé d'au moins quatre couches comprenant une couche de surface (A), une couche adhésive (A), une couche barrière et une couche de surface (B) qui ont été superposées dans cet ordre. La couche de surface (A) a une température de fusion supérieure de 65-150°C à la température de fusion de la couche de surface (B). La couche barrière est faite d'un copolymère de chlorure de vinylidène et a une température de fusion de 130-160°C, en excluant 160°C.

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