| 摘要 |
<p>A die suitable for the extrusion of pipes comprising an outer die body, an inner core, an extrusion path intermediate said outer die body and inner core, said extrusion path including lower and upper reservoirs, a restricted choke section in the extrusion path intermediate said lower and upper reservoirs, and a helical chamber of diminishing interior dimensions in the flow direction of an extrudate.</p> |
