Stretch wrap films

Abstract

The present invention provides for improved polyolefin cling / slip stretch wrap films having superior load retention, elongation, tear resistance and puncture resistance properties and for the methods of using those stretch wrap films. The stretch wrap films are preferably constructed in a multilayer fashion having an outside cling layer, an outside slip layer, at least one inside puncture resistant layer comprising a metallocene-catalyzed polyethylene resin, and at least one inside transverse direction tear resistant layer.

Description

FIELD OF THE INVENTIONThe present invention is directed to stretch wrap films and methods for their use. In particular, the present invention is directed to stretch wrap films having a cling surface and an opposite slip surface and having superior puncture resistance, high elongation to break, high force to stretch the film, and overall strength.BACKGROUND OF THE INVENTIONThe use of thermoplastic stretch wrap films for the overwrap packaging of goods, and in particular, the unitizing of palleted loads is a commercially significant application of polymer film, including generically, polyethylene. Overwrapping a plurality of articles to provide a unitized load can be achieved by a variety of techniques. In one procedure, the load to be wrapped is positioned on a platform, or turntable, which is made to rotate and in so doing, to take up stretch wrap film supplied from a continuous roll. Braking tension is applied to the film roll so that the film is continuously subjected to a stretch...

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