this application describes a cross - head for directing flowable polymeric materials 90 ° from the axis of an extruder or similar pressure source and providing substantially uniform pressure patterns at the cross - head output . this is accomplished by dividing and subdividing the stream entering the cross - head , each subdivision taking place on an axis of pressure symmetry and each substream being twisted 90 ° before reaching its next point of subdivision . the subdivision and twists are accomplished by mounting twisted pieces of flat bar stock in the conduit carrying the stream or substream , each piece having its input end positioned on the axis of symmetry of the stream at the point of stream division .