LINING MATERIAL FOR DUCT

摘要

A lining material formed by providing a nonwoven fabric of a special shape on the inner side of a conventional air-tight tubular woven cloth which has a synthetic resin film on the outer surface thereof, and which is adapted to be inserted into a duct as it is turned inside out by a fluid pressure. The lining material according to this invention has various properties required in conventional lining materials of this kind, and also other properties, such as earthquake resistance and shape-retentivity under an external hydraulic pressure, and is suitably used to reinforce various kinds of underground pipes.