Tubular liner for the rehabilitation of defective sewers with an integral longitudinal pull strap and reinforcing layer

US8978708B2 · kind B2 · utility

Assignee

• Brandenburger Patentverwertung GbR · DE

Inventors

• Tim Brandenburger · Landau, DE
• Philipp Bergmann · Lohr am Main, DE
• Peter Duttenhoefer · Kirchheimbolanden, DE

Key dates

• Filing date: May 7, 2013
• Grant date: Mar 17, 2015
• Expiry date: Sep 7, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1393
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A tubular liner for rehabilitating sewers has a reinforcing layer being expandable in the circumferential direction and formed of fiber rovings and impregnated with a curable reactive resin. The tubular liner has an outer tubular film which encloses the reinforcing layer and is formed of a material that can be expanded radially. A longitudinal pull strap is provided and absorbs the tensile forces acting on the tubular liner when the tubular liner is inserted into the sewer. The tubular film has a laminated nonwoven layer on the side facing the reinforcing layer. The longitudinal pull strap is located between the nonwoven layer and the reinforcing layer and is in immediate contact with the outer side of the reinforcing layer and the nonwoven layer. The longitudinal pull strap has a width of less than 50% of a length of the outer circumference of the reinforcing layer.