| 摘要 |
<p>A process and apparatus for high speed continuous film web wrapping of uniform loads, in which a first wrap is applied in a first direction transverse to the path of the moving load and a second wrap is applied in a second direction opposite the first direction. This dual wrap nullifies the disabling effects of helical wrap bias when a single wrap is applied to a moving load, and produced a longitudinal containment force after film web recovery over time on leading and trailing ends of the load. In the apparatus (30) two wrapping stations (36, 436) are provided together with a wrapping conveyor assembly (32). Each station (36, 436) includes a dispensing rig (44, 444) on which a film roll and an elongation mechanism (70, 470) are mounted. The regulation of elongation in the elongation mechanism (70, 470) and the regulation of film supply speed from the elongation mechanism (70, 470) are independent of film demand speed at the load. The film web is strechted beyond its yield point at ambient temperature.</p> |
