Stretch film and method for producing a stretch film
AssigneeIllinios Tool Works Inc.
InventorsGerd Heikaus, Lothar Heikaus
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Abstract
A stretch film for the packing of goods, particularly for the packing of goods stacked on a pallet, comprises a prestretched main film (10). The main film (10) is reinforced by reinforcement strips (12) extending in the longitudinal direction. The reinforcement strips (12) are made from film strips of prestretched film which have been folded a plurality of times in the longitudinal direction. Between two adjacent reinforcement strips (12), the main film (10) can comprise two mutually staggered rows of holes (16,18). This stretch film with perforations (14) is particularly useful for the packing of food items.
Claims22
A method of producing a stretch film for packing items, comprising:
- supplying film strips from a first prestretched film,
- folding the film strips at least once in a transverse direction thereof to obtain reinforcement strips,
- supplying a prestretched main film, and
- attaching the reinforcement strips to the main film in such a manner that the reinforcement strips extend in parallel to each other in a longitudinal direction of the main film,
- wherein the main film and the reinforcement strips are adhered to each other while they have different temperatures;
- and
- wherein, after the reinforcement strips are adhered to the main film, a plurality of mutually staggered rows of oval or elliptic holes are configured between two reinforcement strips to extend in the longitudinal direction of the main film so that the shorter semiaxis is oriented in parallel to the tension direction prevailing in the stretched film.
A stretch film, comprising:
- a prestretched main film;
- reinforcement strips made from a prestretched film and extending in a longitudinal direction of the prestretched main film;
- and
- a plurality of holes perforated in the main film only in regions between the reinforcement strips and having reinforced edges;
- wherein the reinforcement strips are film strips made from the prestretched film which is folded in the transverse direction.
A method of producing a stretch film for packing items, said method comprising:
- supplying film strips from a first prestretched film,
- folding the film strips at least once in a transverse direction thereof to obtain reinforcement strips,
- supplying a prestretched main film other than the first prestretched film and the reinforcement strips,
- adhering the reinforcement strips to the main film in such a manner that the reinforcement strips extend in parallel to each other in a longitudinal direction of the main film, and
- perforating holes in the main film only in regions between the reinforcement strips.
Dependencies are inferred from the claim text.