New high resistance heat-shrinkable thermoplastic film

B - Operations – Transporting – 32 – B

Patent

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Details

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

Patent

CA 2347031

A multi-layer heat-shrinkable film, which is useful in the manufacture of bags with a good balance of mechanical, optical and shrink properties and sealability, comprises an outer heat-sealing layer (a) of a heat-sealable polyolefin, an outer abuse layer (b) comprising a polyamide with a melting temperature >= 175~C, preferably blended with an ethylene-vinyl alcohol copolymer, and an intermediate gas barrier layer comprising PVDC. The film in the form of a seamless tube wherein the heat-sealing layer (a) is the innermost layer of the tube and the containers, such as bags and pouches, obtained from the film by heat-sealing the heat-sealing layer (a) to itself are also claimed. The bags thus obtained can suitably be heat-sealed also when overlapped.

L'invention concerne un film thermorétractable multicouche, lequel est utile dans la fabrication de sacs présentant un bon équilibre entre les propriétés mécaniques, optiques et de retrait et la scellabilité, et comporte une couche de thermoscellage (a) extérieure constituée d'une polyoléfine thermoscellable, une couche inviolable (b) extérieure comprenant un polyamide avec une température de fusion >= 175 ·C, de préférence mélangé avec un copolymère d'éthylène-alcool vinylique, et une couche intermédiaire non perméable aux gaz et contenant du PVDC. Le film sous la forme d'un tube sans soudure, dans lequel la couche de thermoscellage (a) est la couche la plus à l'intérieur du tube, et les contenants tels que des sacs et des sachets, obtenus à partir du film par thermoscellage de la couche de thermoscellage (a) sur elle-même, font également l'objet de l'invention. Les sacs ainsi obtenus peuvent aisément être thermoscellés même lorsqu'ils se chevauchent.

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