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US 3,941,643 AGranted
Apparatus for the manufacture of laminated packing material containing metal foil
AssigneeTetra Pak International AB
InventorGyula Balla
Life of this patent
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Abstract
The present invention concerns a method for the manufacture of laminated packing material containing at least one layer of a metal foil, e.g., aluminum foil, and a layer of plastic material applied to the said metal foil. The invention also concerns an apparatus for the realization of the method for the manufacture of laminated packing material.
Claims1
Apparatus to laminate a thermoplastic material to a web of metal foil comprising:
- a means to supply a web of metal foil, means to extrude a layer of thermoplastic material on said web of metal foil at a temperature below the oxidation temperature of said thermoplastic material, a source of high frequency current including a plurality of substantially parallel insulated metal bars coupled together and forming an arched path in the direction of travel of the metal foil, a pair of cooled pressure rollers located between said extruder and said metal bars, means to pass said metal foil with thermoplastic thereon through said cooled pressure rollers and over said metal bars in an arcuate path and means to compress said layers of material after they pass over the metal bars.
Dependencies are inferred from the claim text.