US Patent:
20040157022, Aug 12, 2004
Inventors:
Walter Bilgram - Chesterfield MO, US
Lynn Osborn - Wildwood MO, US
James Caldwell - Greenville NC, US
International Classification:
B32B001/08
Abstract:
A method of forming a liner for a passage such as a sewer includes forming panels composing the liner using a neat resin of a first viscosity and a polymer concrete of a second, high viscosity. The neat resin is inserted into a mold cavity before the polymer concrete and is displaced upwardly by the polymer concrete pour to impregnate a fiber layer disposed along the periphery of the mold cavity. Resulting panels preferably have an offset joint to increase the joint strength between upper and lower panels forming the liner.
