Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1991-04-18
1993-03-02
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264 407, 4251335, 425192R, 425462, B29C 4706, B29C 4792
Patent
active
051907119
ABSTRACT:
Method and apparatus for fabricating multiple layer sheet materials while minimizing the time during which a sensitive polymeric melt stream is in contact with metal. The method comprises encapsulating the sensitive melt stream with a second polymeric melt stream, preferably of a lower viscosity, at the outlet of the apparatus which produces the sensitive melt stream. When the encapsulating melt stream has a lower viscosity than the sensitive melt stream, a transport means is preferably employed between the encapsulating means and the die, whereby thickness variations about the circumference of the encapsulating melt stream are reduced.
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American National Can Company
Stenzel Robert A.
Thurlow Jeffery
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