An accumulator extrusion head assembly for producing a parison having at least one stripe extending longitudinally thereof comprises an extrusion head body member having an opening extending inwardly from a nozzle outlet end and a mandrel positioned in the body member to define a generally annular extrusion...http://www.google.com/patents/US4874305?utm_source=gb-gplus-sharePatent US4874305 - Accumulator extrusion head for producing striped parisons
