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. An apparatus for wrapping a bundle with a resilient stretchable film comprising:
a dispensing apparatus for receiving film from a roll, the film having a first panel over a second panel, the panels being interconnected at a fold line, the dispensing apparatus having:
a sealing device for forming seals between the first panel and the second panel; and
a cutting device associated with the sealing device to cut the film along the seals to form a bag;
a stretching apparatus associated with the dispensing apparatus, the stretching apparatus having:
arms to grasp portions of the bag from the dispensing apparatus, and open the bag;
handling assemblies to receive the opened bag from the arms, the handling assemblies being displaceable with respect to one another to stretch the bag; and
actuators to displace the bag stretched on the handling assemblies onto a bundle, whereby the stretched bag is gradually released from the stretching apparatus to the bundle.
2. The apparatus according to claim 1 , wherein said film consists of a material resilient at ambient temperature.
3. The apparatus according to claim l, wherein said closed end of said bag defines a gusset for tightly covering the bundle.
4. The apparatus according to claim 1 , wherein a bag is formed in the dispensing apparatus while another bag is in the stretching apparatus.
5. The apparatus according to claim 1 , wherein bags of different sizes are subsequently formed in the dispensing apparatus as a function of different sizes of bundles being subsequently wrapped by the apparatus.
6. The apparatus according to claim 1 , wherein subsequent bags are stretched to different levels as a function of different sizes of bundles being subsequently wrapped by the apparatus.