| 摘要 |
The present invention relates mainly to a machine for winding film, to a method of manufacturing spools of pre-stretched film, and to spools of pre-stretched film obtained thereby. The method of winding spools of pre-stretched stretchable film of the invention includes importing oscillation to the film, advantageously with a component perpendicular to the axis of the film. For example, during pre-stretching and winding of the film on a take-up spool, a feed spool, i.e. a spool from which the stretchable film for stretching is taken, is caused to oscillate, and/or the take-up core is caused to oscillate. This ensures that successive layers of film are offset, in particular at the margins of the film. Spools of film obtained in this way do not have portions of extra thickness and lower tension at the margins as is the case for prior art spools of pre-stretched film. The present invention is mainly applicable to wrapping, with the film being paid out manually.
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