초록 ▼

Apparatus and methods are disclosed for a high speed production line in which a container is wrapped with a plastic label comprising a foam polystyrene layer, there being means to move a leading edge of the label to the periphery of a rotating vacuum drum, means to apply methylene chloride to the un

Apparatus and methods are disclosed for a high speed production line in which a container is wrapped with a plastic label comprising a foam polystyrene layer, there being means to move a leading edge of the label to the periphery of a rotating vacuum drum, means to apply methylene chloride to the underside of the foam layer to form finite areas on the leading label edge and a finite area on the trailing edge. The finite areas have therein a rapidly solidifying tacky solution of the foam polymer in methylene chloride, the tacky viscous solutions rapidly solidifying to form an adhesive bond. The solvent-applied label is quickly moved to a label wrapping station where it is wrapped around a container, the finite areas on the leading edge tacking the label to the container, and the finite area on the trailing edge forming a cohesive bond on the seam formed by the overlapped label ends.

대표청구항 ▼

In apparatus for wrapping a plastic label about a bottle and adhering the label to the bottle, where the label is a composite sheet of a solid polymer layer and foam polymer layer with the foam layer being applied to the bottle surface, the improvement comprising, just before wrapping, means for app

In apparatus for wrapping a plastic label about a bottle and adhering the label to the bottle, where the label is a composite sheet of a solid polymer layer and foam polymer layer with the foam layer being applied to the bottle surface, the improvement comprising, just before wrapping, means for applying a solvent for the polymer of the foam polymer layer to at least two finite areas of the surface of the foam layer with one area adjacent the leading edge of the label and the other area constituting a full height strip along the trailing edge of the label the solvent dissolving the polymer of the foam layer rapidly to form a momentary tacky bond at the finite areas of the leading edge sufficient to tack the label to the container, the leading edge bond becoming weaker and weaker as the solvent evaporates, and means for rolling a bottle along the solvent treated label with the leading edge momentarily tacked to the bottle and the trailing edge bonding to itself to form an overlapping seam in which the trailing edge finite area bond becomes stronger and stronger, wherein said means for applying a solvent to the label comprises a rotating gravure roll having at least two areas of indentation in its surface, with each area being circumferentially spaced from the other a distance slightly less than the full length of a label, means for moving the foam surface of the label into engagement with the gravure roll, and means engaging the gravure roll surface for applying the solvent to the areas of indentation in said gravure roll, said solvent supplying means further comprises an elevated container for said solvent, means for cooling the solvent in said container, means connecting the bottom of said solvent container to the bottom of said fountain and means connected to the top of said fountain for returning excess solvent from said fountain to said elevated container. In a method of providing a label around a container having a body whereby the label is wrapped around the container and the plastic label comprises a foam polymer layer, the method comprising the steps of: A. transporting toward a wrapping station a sheet of the plastic label stock whereby the transporting is continuous and the length axis of the stock is parallel to the horizontal; B. cutting the stock to form a plurality of labels of a desired length; C. moving the leading edge of the label to a vacuum drum; D. placing and guiding the label on the periphery of the drum with the top face next to the peripheral drum surface; and E. wrapping the label around the container, the improvement comprising: F. just before wrapping, applying a low boiling, quick evaporating solvent for the polymer of the foam layer to the underside of the foam layer in at least a finite area adjacent the leading edge of the label to form a momentary tacky bond that is a viscous tacky solution of the polymer in the solvent in the finite area, the bond between the label and the container becoming weaker and weaker after wrapping, whereby the label can be easily and cleanly stripped from the container so the container can be recycled; and G. applying the solvent to a finite area of the trailing edge to form a solid adhesive bond between the foam layer and the overlapped end of the label, the bond at the overlapped ends becoming stronger and stronger.