row of plastic or other plastic materials, and procedure and device for framstellning of roret

摘要

PCT No. PCT/SE84/00389 Sec. 371 Date Jul. 8, 1985 Sec. 102(e) Date Jul. 8, 1985 PCT Filed Nov. 14, 1984 PCT Pub. No. WO85/02144 PCT Pub. Date May 23, 1985.The invention refers to a method and apparatus for manufacturing a single-wall pipe, tube or like conduit (9,44) having smooth inner surfaces and a mechanical-strength enhancing pattern of walls, flanges or ridges on the outer surface thereof, the conduit being made of plastics or like extrudable material.