| 摘要 |
A cross head die for extruding an annular layer of thermoplastic resin on a mandril (20) includes a resin flow path having an inlet (34,86), a cardioid shaped primary distribution channel (84), a gate passage (88), an equilibration chamber (86) and a transfer channel (22) surrounding the mandril (20) and a mouth (36) at the downstream end of the transfer channel (22) opening into a resin extrusion channel surrounding the mandril (20). |
