초록 ▼

The invention relates to a method for manufacturing a multi-layer corrugated pipe and to a corrugated pipe manufactured by the method and comprising an inner tube (2), a corrugated outer tube (5) and a plastic layer therebetween. Separate layers (3,6) of plastic are formed on the outer surface of th

The invention relates to a method for manufacturing a multi-layer corrugated pipe and to a corrugated pipe manufactured by the method and comprising an inner tube (2), a corrugated outer tube (5) and a plastic layer therebetween. Separate layers (3,6) of plastic are formed on the outer surface of the inner tube (2) and the inner surface of the outer tube (5), said separate layers of plastic being affixed to one another at least at the web portions (5a) of the corrugations of the outer tube (5) when the inner tube and outer tube are connected.

대표청구항 ▼

[ We claim:] [11.] In a multi-layer corrugated pipe comprising an inner tube, a corrugated outer tube and a first layer of plastic therebetween, the improvement wherein the pipe also comprises a second layer of plastic, the first and second layers of plastic being formed on an outer surface of the i

[ We claim:] [11.] In a multi-layer corrugated pipe comprising an inner tube, a corrugated outer tube and a first layer of plastic therebetween, the improvement wherein the pipe also comprises a second layer of plastic, the first and second layers of plastic being formed on an outer surface of the inner tube and an inner surface of the outer tube respectively or vice versa, said first and second layers affixing the inner tube and outer tube to one another at least at web portions of corrugations of the outer tube.