| 摘要 |
A film web (58) is dispensed from a film web dispenser (70) and wrapped around a bundle (40) by moving the bundle into an applicator mandrel (180), revolving the film web dispenser (70) relative to the applicator mandrel (180), dispensing the film web (58) from the film web dispenser (70) on to the applicator mandrel (180) at a constant supply speed. The film web (58), wrapped around the applicator mandrel (180), is transported beyond the downstream end of the applicator mandrel (180), the bundle (40) is moved beyond the downstream end of the applicator mandrel (180) and the film web (58) is applied from the applicator mandrel (180) onto the bundle (40) so as provide a containment force in the film web (58) after it is applied onto the bundle (40). A duel stage wrapping system is used in such a manner that each orbiting dispenser (70) is restrained to dispense the film web at a constant supply speed less than the lowest film demand speed at the applicator mandrel (180) and independent of the tension on the film web between the film web dispenser (70) and the applicator mandrel (180). The applicator mandrel (180) is positioned to resist crushing or disalignment of the bundle (40) or subunits of the bundle within the applicator mandrel (180) and also modifies its position to modify the wrapping crosssection of the bundle (40) so that the web strain elongation varies substantially within a linear wrap force range above the yield point of the stress strain characteristics of the film web between the film web dispenser (70) and the applicator mandrel (180). |
