Method of and apparatus for ram-extrusion of aromatic...

Details Method of and apparatus for ram-extrusion of aromatic... Method of and apparatus for ram-extrusion of aromatic...

B - Operations, Transporting

29

C

18/726

B29C 47/54 (2006.01) B29C 47/00 (2006.01)

Patent

CA 1124025

Abstract A method of forming a shaped article from non- melt fabricatable, high temperature, polymeric (polyimide and polyamide) resins, using an apparatus including a die with compaction, back pressure and relief zone. Such resins are ram-extruded at a temperature of between about 20°C and 400°C, but below the second order glass transition temper- ature of the resin to form a shaped article, followed by heating at a temperature above about 250°C for a time sufficient to coalesce the resin. Such method and apparatus is particularly well-suited to produce close tolerance articles of precise dimensions, such as rods and tubes. 28 AD-4867

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