Method and apparatus for automated wrapping
A method and apparatus are provided for the automated wrapping of a bundle with a resilient stretchable film. The method comprises the steps of (i) unrolling a desired length of the film from a roll. The film has a first panel overlapping a second panel. The panels are interconnected at a sealed first end. (ii) Sealing a second end of the panels to bond them together by a second seal at the desired length. (iii) Cutting the film along the second seal to form a tube. (iv) Separating the first panel of the tube from the second panel by grasping film edges of each of the panels, whereby the tube may be opened. (v) Loading the tube in an opened position on an expandable frame, whereby at least a portion of the tube is accumulated in a folded condition on the expandable frame. (vi) Stretching the tube by expanding the expandable frame. (vii) Covering the bundle with the tube, by displacing the expandable frame towards the bundle, whereby the stretched tube is gradually released therefrom onto the bundle in a stretched resilient condition.
1. A method for automated wrapping of a bundle with a resilient stretchable film, comprising the steps of:
i) unrolling a desired length of said film from a roll, said film having a first panel over a second panel, said panels being interconnected at a sealed first end and at a fold line;
ii) sealing a second end of said panels to bond them together by a second seal at said desired length;
iii) cutting said film along said second seal to form a bag;
iv) separating said first panel of said bag from said second panel by grasping a portion of each said panel of said bag, whereby said bag may be opened at an end opposite said fold line;
v) loading said bag in an opened position on four film handling assemblies of a stretching apparatus;
vi) stretching said bag by expanding said stretching apparatus by displacing at least two of the film handling assemblies; and
vii) covering the bundle with said bag, by displacing the stretching apparatus towards the bundle, whereby said stretched bag is gradually released from said film handling assemblies onto said bundle in a stretched resilient condition.
2. The method according to claim 1 , wherein the steps iv) to vii) are performed with a first bag while the steps i) to iii) are performed simultaneously with a second bag vii) to wrap a subsequent bundle.
3. The method according to claim 1 , wherein in subsequent steps vi) for a first bag and a second bag, the bags are respectively stretched to different levels as a function of different sizes of bundles.
4. The method according to claim 1 , wherein bags of different sizes are formed in subsequent sets of the steps i) to iii) as a function of different sizes of bundles.