Mannesmann Aktiengesellschaft

Walter Quitmann

Helmut Landgraf

Karl-Heinz Hakert

A roll or roller for urging extruded thermoplastic strip onto an axially advancing, rotating pipe is constructed from a silicon rubber core with a shore hardness of 40 and having a softer silicon rubber jacket with a shore hardness not exceeding 30. The core is traversed by axial bores.

Pressure roll for jacketing steel pipes with thermoplastic strip

A steel pipe with longitudinal welding seam is wrapped helically by means of a polyethylene ribbon which is normally stretched, but temporary stretch relief provides for a thicker envelope above and adjacent to the seam. A ribbon deflector roll and a pressure roll provide the stretching through a speed differential which is changed as stretch relief.

Growing community of inventors

Munich, Georgia

Walter Quitmann