Material-efficient stripwound metal hose

Material-efficient stripwound metal hose

Innovative shape of cross section for stripwound metal hoses provides better materials utilization.

Intellectual Property and Innovation Management

Deniz Bayramoglu, +49 6151 16-57215

Robert Heitzmann, +49 6151 16-57228

Status quo

Flexible tubes or pipes made of sheet metal profiles are used in pipeline construction, in exhaust systems or as protecting shell. The so-called agraff hose as the most prominent type is used in shower hoses. Disadvantageous to its basic shape is a doubling of the profile cross-section in places, which results in high materials usage.

Our technology: New cross-section for a flexible metal hose

Present limitations with regard to material and stability issues can be eliminated by a new profile cross-section, which allows the custo-mary longitudinal expansion and compression as well as the curvature in radial direction. Furthermore, a material reduction of the engaging construction elements can be realized.


  • Material savings due to lower wall thicknesses and a reduced number of wall elements.
  • Cost-effective production through the use of sheet metal blanks and identical construction of essential construction elements..
  • Improved guiding and sliding properties to avoid leaking or dissolved structure sections.

Current stage of development

Technology-Readiness-Level: Level 2. Various variants are designed. The construction of a prototype is planned.

Application possibilities

Flexible pipes for pipeline construction, in exhaust systems or as a protective cover.

Intellectual property situation

The presented technology is protected by intellectual property rights.

Commercialization opportunities

We are looking for industry partners who are interested in using the technology. If there is any need for further development, a close cooperation between the industry partner and TU Darmstadt is possible.