Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1989-06-29
1991-09-10
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
15624411, 264211, 26421112, 4251311, 4251335, B29C 4706
Patent
active
050471961
ABSTRACT:
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.
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Torres Enrique
Zuckerberg Leo
Tek-Rap, Inc.
Thurlow Jeffery
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