| 摘要 |
A process for using a carriage for unwinding packaging film which comprises a stand and a supporting shaft for a film reel. A device is provided with rollers having axes parallel to that of the supporting shaft. The carriage is intended to be incorporated in a packaging machine. The process includes an initial phase for associating a reel with a supporting shaft and a subsequent phase for positioning the film web in the roller device comprising two upstream and downstream main rollers defining between them a passage and designed to pivot about their axes in opposite directions. Further, a phase for unwinding the film for the packaging of the load is provided wherein, during the phase of positioning the film web, the starting point is an initial state in which the upstream and downstream guide rollers are relatively displaced from their final operational location to a temporary initial positioning location. Also in an initial introduction phase, an initial end of the film is introduced between the upstream main roller and guide roller and in the direction of the downstream main roller. Further, in a subsequent running phase, the upstream and downstream main rollers are pivoted about their axes, and a particular length of film is made to run in the direction of its introduction into the device. In a final positioning phase, as a result of a relative displacement the upstream and downstream guide rollers are brought from their initial location to their final operational location, the effect of this being to bend the film, at the same time laying it against the upstream and downstream main rollers.
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