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US 6,351,928 B2Granted
Device for packaging products in containers sealed with stretchable plastic film
AssigneeMinipack-Torre S.p.A.
InventorFrancesco Torre
Life of this patent
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AssigneeMinipack-Torre S.p.A.
InventorFrancesco Torre
Estimating the term…
A packaging device is provided with a feed unit for a highly stretchable polyethylene-based plastic film which during use is able to generate and maintain a high number of electric charges on its surface. A vertically movable head having on its lower end a gripping surface with a very smooth, mirror-like gripping surface, is then lowered to have its gripping surface engaged with the leading end of the film which overlies and is supported on a planar supporting surface. The smooth gripping surface of the head adheres cohesively by electrostatic molecular attraction to the film, which is then moved by the head over the upper end of a package containing food, or the like, which is to be covered by the film. The head then descends severing the film from the supply thereof and securing the edge of the film to the edge of the container.
A device for packaging products (11) with stretchable plastic film (29) on a support (12) for the product (11) comprising means (16) housing a support (12) in a position to receive the film (29), means (23) for gripping and applying the film (29) on the support (12) and means (41) for sealing the film on the support, said means (23) for gripping and applying the film comprising a movable stretching frame (40, 43, 48) for pressing the plastic film against the outer edge of the support (12) in order to stretch the film over the product on the support (12), said movable stretching frame having gripping elements (40, 48) provided with portions (46, 49) each having a smooth, mirror-like surface operative to adhere cohesively with said film upon engagement therewith.
Dependencies are inferred from the claim text.