| 摘要 |
PCT No. PCT/CA91/00214 Sec. 371 Date Feb. 8, 1993 Sec. 102(e) Date Feb. 8, 1993 PCT Filed Jun. 14, 1991 PCT Pub. No. WO92/22416 PCT Pub. Date Dec. 23, 1992.An apparatus for making smooth walled tube (20) in a travelling mold tunnel (26) includes corrugations (32) for traction of tube being molded. An extrusion nozzle (16) having an exit angle of 45 DEG or more may provide additional advantage. |
