Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1992-05-28
1993-10-26
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
118411, 264212, 4251311, 425224, B29C 4706
Patent
active
052563570
ABSTRACT:
Polymeric films of two or more layers are cocast on a moving substrate from a die having extrusion slots which extend to parallel slot exits spaced close to the substrate. An upstream slot exit has outer and inner lips formed by coplanar lands. The outer upstream land extends to a pinning line formed by the intersection with an outer surface of the die. A downstream slot exit also has lips formed by planar lands and the outer land of the downstream slot exit is spaced a greater distance from the substrate than the other lands. Films with a plurality of uniform layers of different thicknesses are cocast from dopes of different viscosities.
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Eastman Kodak Company
Thurlow Jeffery
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