| 摘要 |
A continuous seamless tube is produced by feeding material into the top end of a cylindrical former (3) e.g. a mould whose axis (6) gyrates over a cylindrical, frusto-conical, or conical surface, preferably without rotating about its axis (6). The centrifugal force set up by the gyration holds the material to the former wall along which it travels to be continuously withdrawn from the bottom end of the former. The material may be cooled, heated, thickened e.g. dewatered, or compressed in passing along the former, or may be hardened, cured, or solidified to be withdrawn as a moulded tube from the former. The casting of a steel tube is described, but the material may also comprise non-ferrous metal, cellulose fibre, mineral fibre, cementitous, polymeric, or foodstuff materials, and may incorporate a reinforcing mesh to prevent tube breakage as it is being withdrawn. The tube may be slit and opened up into a sheet. <IMAGE> |
