| 摘要 |
The invention concerns apparatus for molding tube utilizing a travelling mold tunnel. The tunnel is made up of mold blocks each comprising parts which are hinged together to be closeable to form the tunnel and openable to release tube from the tunnel. The opened mold blocks from the downstream end of the tunnel are returned to the upstream end to reform the tunnel about an extrusion nozzle for thermoplastic extrudate without changing the orientation of the axes of their bores so that said axes always remain generally parallel with the axis of the mold tunnel. Mold blocks removed from a downstream end of the mold tunnel are returned to the-upstream end at a speed greater than the travelling speed of the mold tunnel.
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