Stretch cling film and fabrication method

B - Operations – Transporting – 32 – B

Patent

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B32B 27/32 (2006.01) B32B 37/00 (2006.01) B65D 65/40 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2177377

Multilayer thermoplastic stretch wrap film having substantial one-sided cling properties is made without the use of polymers with high levels of n-hexane extractables, dissimilar polymer chemistries, or low molecular weight tackifiers. The reverse or cling layer comprises at least one homogeneously branched ethylene polymer composition having a density of about 0.90 g/cc or less and the obverse or non-cling layer comprises a propylene or ethylene polymer composition having a density greater than 0.90 g/cc. The multilayer film is particularly useful for load palletization end-use applications.

Cette invention se rapporte à un film d'emballage étirable thermoplastique multicouche, ayant une face adhésive, dans la fabrication duquel il n'est pas nécessaire d'utiliser des polymères ayant des niveaux élevés de n-hexanes extractibles, des structures chimiques dissemblables ou des agents gluants à faible poids moléculaire. La couche du côté adhésif ou verso comprend au moins une composition polymère d'éthylène à ramification homogène, ayant une densité d'environ 0,90 g/cm?3¿ au maximum, et la couche du côté glissant ou recto comprend une composition polymère de propylène ou d'éthylène ayant une densité supérieure à 0,90 g/cm?3¿. Ce film multicouche s'emploie particulièrement pour emballer des charges palettisées.

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