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Method of applying a plastic wrap to a contoured container
| Details |
Inventors: Hoffman, Wolfgang W.;
Assignee: Shibuya America Corporation (Modesto, CA)
Primary Examiner: Weston; Caleb
Assistant Examiner:
Attorney, Agent or Firm: Stidham; Melvin R.
The method of this invention includes the step of providing a mandrel sleeve shaped on the inside to fit over the small diameter end of a contoured container and being of an outer diameter substantially equal to the large diameter portion of the container. After applying a solvent of the plastic sheet material to the trailing edge of a length thereof, the sheet is wrapped around the container and the mantrel sleeve so that the trailing edge overlaps the leading edge and the solvent forms a firm bond between the overlapped edges. The mandrel sleeve is then withdrawn from the wrapped length, leaving it around the container, and the sheet material is heat shrunk to fit tightly over its full height around the contoured container. Before the sheet is wrapped around the mandrel and container, an adhesive, such as a hot melt glue, may be applied too that portion of the sheet that is wrapped in direct contact with the container. |
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DETAILED DESCRIPTION In applying a full label or covering to a container, only a portion of which is cylindrical, I provide a mandrel in the form of a cylindrical sleeve with vaccum ports to grip a label as it is wrapped around the outer surface.
The sleeve mandrel is of substantially the same outer diameter as the maximum diameter, cylindrical portion of the container, with an inner axial cavity to receive and accommodate the smaller portions of the container as, for example, the neck and lid of a bottle that is necked down to a small mouth.
The sleeve mandrel is placed over the container with the cylindrical portion protruding, and a plastic label or covering material is wrapped around both the sleeve mandrel and the large diameter cylindrical portion of the body.
Preferably, a suitable adhesive is applied just to that portion of the label that contacts the container, and the remainder of the plastic sheet is held in place on the sleeve mandrel by means of a vacuum.
The overlapped trailing and leading edges are bonded together by a solvent of the plastic material and, after bonding, the mandrel is withdrawn from the label sleeve so formed.
The label sleeve is then heat shrunk around the smaller container portions within.
In some instances, the lower portion of the container may be of reduced size.
In such case, the lower portion of the container is positioned in a sleeve mandrel that opens upwardly, prior to wrapping the label around the sleeve and container.
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