ENRIQUE TORRES
Electrician at Msn Rdg Ln, Houston, TX

5047196, Sep 10, 1991

Jun 29, 1989

7/347930

Leo Zuckerberg - Houston TX
Enrique Torres - Houston TX

Tek-Rap, Inc. - TX

B29C 4706

264171

A method and apparatus for forming intimately fused, multiple layer co-extruded adhesive tapes. The apparatus includes a co-extrusion die having an outlet aperture therein of elongated width and reduced height and first, second and third interior extrusion channels which merge in the interior of the die to form a common outlet channel which passes outwardly through the outlet aperture. The apparatus is operative in accordance with the method by feeding a first pressurized stream comprising a molten elastomeric based adhesive polymer to the first extrusion channel, a second pressurized stream comprising a molten flexible thermoplastic polymer and an elastomerically compatible coupling agent to the second extrusion channel and a third pressurized stream comprising either a molten flexible thermoplastic polymer or a molten elastomeric based adhesive polymer to the third extrusion channel. When the apparatus is operated in this manner the three molten pressurized streams merge in the interior of the die and pass outwardly through the outlet aperture as a thin partially stratified sheet comprising three intimately fused layers.