| 摘要 |
An apparatus for covering groups (1) of products with stretch film (2) comprises: a roll (4) of tubular stretch film (2) with pleated sides; means (6) for gripping and opening the mouth of the film (2) to give the mouth a polygonal shape; the means (6) comprise one gripper element for each corner (A) of the film (2), operating by holding the corners (A) by means of a first member (7) and a second member (8) for clamping and retaining the corners (A); a film (2) stretching unit (11) for receiving the film (2) from the gripping means (6) in the spread open configuration and stretching it to a size larger than the perimeter of the product group (1); each gripper element (6) is equipped with a third, auxiliary clamping member (12), positioned in the vicinity of one of the two clamping members (7, 8) and driven, by respective second means (13), between an idle position, where the third, auxiliary member (12) is located under the horizontal plane defined by the mouth of the film (2), and a working film (2) clamping position where the third, auxiliary member (12) is turned inside the mouth of the film (2) in such a way as to hold the film (2) from the inside, thus increasing the working perimeter of the mouth of the film (2).
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