| 摘要 |
A film web is dispensed from a film web dispenser and wrapped around a bundle by moving the bundle into an applicator mandrel, revolving the film web dispenser relative to the applicator mandrel, dispensing the film web from the film web dispenser on to the applicator mandrel at a constant supply speed. The film web, wrapped around the applicator mandrel, is transported beyond the downstream end of the applicator mandrel, the bundle is moved beyond the downstream end of the applicator mandrel and the film web is applied from the applicator mandrel onto the bundle so as provide a containment force in the film web after it is applied onto the bundle. A dual stage wrapping system is used in such a manner that each orbiting dispenser is restrained to dispense the film web at a constant supply speed less than the lowest film demand speed at the applicator mandrel and independent of the tension on the film web between the film web dispenser and the applicator mandrel. The applicator mandrel is positioned to resist crushing or disalignment of the bundle or subunits of the bundle within the applicator mandrel and also modifies its position to modify the wrapping cross-section of the bundle 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 and the applicator mandrel.
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