Appeal No. 1998-0269
Application No. 08/396,645
APPENDIX
11. A method for producing a multilayer plastic
composite,
said composite comprising a sequence of layers of at
least two incompatible thermoplastic plastics, A and B,
wherein said sequence of layers alternates between A and B, a
layer of plastic B is discontinuous at regular intervals to
form gaps in said layer of plastic B, and said gaps in said
layer of B are filled in with plastic A;
said method comprising coextruding plastic A and plastic
B through a die comprising a pair of parallel exit slits and a
plurality of exit ports, with a gap between each port, located
between said pair of parallel exit slits, said plurality of
exit ports being evenly spaced along a line parallel to said
pair of exit slits,
wherein said coextruding plastic A and plastic B
comprises forming a pair of fluid streams of said plastic A by
passing a fluid stream of plastic A through said pair of
parallel exit slits and forming a plurality of fluid streams
of plastic B with gaps between each stream of said plastic B
by passing a fluid stream of plastic B through said plurality
of exit ports, so that said fluid streams of said plastic A
exit said pair of exit slits and said fluid streams of plastic
B exit said plurality of exit ports in such a manner to result
in a portion of said fluid streams of said plastic A passing
through said gaps between each stream of said plastic B to
effect fusion of said pair of fluid streams of said plastic A,
to obtain said composite.
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