Corrugated hose

Plastic corrugated pipe for electrical lines

A corrugated hose differs from a corrugated tube , which is also axially flexible, in that it is elastic in the radial and longitudinally expanding directions. This is mainly due to the material, but it can still be supported by the shape of the corrugation. Corrugated hoses are both protective tubes for the actual 'utility vehicles ' - cables , pipes , etc. - as well as transporters of liquids and gases themselves . A corrugated hose can - depending on the application - consist of one or more layers.

For the metallic design, see also metal bellows .

use

In the automotive industry , mechanical and plant engineering and medical technology , corrugated tubing is used to protect and bundle electrical or other cables and also to make flexible connections to peripheral devices. There are also installation hoses that can be opened lengthways for this purpose.
In electrical installations, corrugated plastic hoses are mainly used as or instead of so-called empty conduits both outdoors, but above all inside building walls and ceilings.

materials

Diameter of a corrugated hose

Corrugated plastic pipes are extruded from thermoplastic polymers in mold blocks :

Manufacturing

The manufacture of thermoplastic corrugated pipe / hose takes place using extruders and then in the corrugator that gives the corrugation . First, extruders press the heated and plasticized plastic material into the mold jaws of the corrugators via the injection head. A fixed nozzle is also installed in the spray head to hollow out the plastic strand from the inside with compressed air. In the corrugator, several divided, consecutive, circumferential corrugated half-segments as a negative form move at a steady pace. The half-segments are pressed together and the plastic material is pressed into the molds by the compressed air. This hardens when it cools, creating an endless tube. The outside diameters that can be produced with corrugators are between 3 mm and 2,400 mm outside diameter.

Metallic corrugated pipes are roll seam welded from tape and corrugated hydrodynamically or by means of rollers.

literature

Alfred Hösl, Roland Ayx, Hans Werner Busch: The electrical installation in accordance with regulations, residential construction, commercial industry. 18th edition, Hüthig Verlag, Heidelberg, 2003, ISBN 3-7785-2909-9
Hans-Günter Boy, Uwe Dunkhase: Electrical installation technology The master's examination . 12th edition, Vogel Buchverlag, Oldenburg and Würzburg, 2007, ISBN 978-3-8343-3079-6
Winfrid Hauke, Rolf Thaele, Günter Reck: RWE Energie Bau-Handbuch. 12th edition, Energie-Verlag GmbH, Heidelberg, 1998, ISBN 3-87200-700-9