| 摘要 |
<p>Head for extruding single or multi-layer tube comprises supply ducts each leading to a distribution chamber centrally placed in head axis. From distribution chamber, radial ducts lead to a ring of overlapping chambers around the head, which are in turn connected either directly or through an annular balancing duct, with the annular nozzle. Arrangement ensures improved mixing of flow, preventing streaky effect on tube.</p> |
