| 摘要 |
<p>A method comprises unwinding a film (3) initially wound on a reel (7) by a roller (22) and wrapping a product (2) with said film (3) maintaining a desired tension on said film (3), said unwinding comprising rotating said roller (22) by motor means (25) around a longitudinal axis at a rotation speed such as to give to said film (3) said desired tension; said method further comprises detecting an operating parameter of said motor means (25), comparing said operating parameter with a reference parameter, intervening on said motor means (25) in such a way as to decrease a deviation detected between said operating parameter and said reference parameter.</p> |
