Multiple layer sheet materials, methods and apparatus

Details Multiple layer sheet materials, methods and apparatus Multiple layer sheet materials, methods and apparatus

B - Operations, Transporting

29

C

18/746

B29C 47/06 (2006.01) B29C 47/28 (2006.01) B29C 47/56 (2006.01) B29C 69/00 (2006.01) B32B 27/08 (2006.01)

Patent

CA 1335032

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 encap- sulating means and the die, whereby thickness variations about the circumference of the encapsulating melt stream are reduced.

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