| 摘要 |
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 DEG C. and 400 DEG C., but below the second order glass transition temperature of the resin to form a shaped article, followed by heating at a temperature above about 250 DEG 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. |
