Patent ID: 6082828
Filing Date: 2000-07-04
Classification: E21F

Abstract:
A curtain for defining a stopping in an underground passageway between a pair of spaced-apart pillars to block and direct air flow in underground passageways, comprising:a bladder defined by two opposing flexible, woven substantially air permeable sheets joined together by a plurality of connectors interwoven therewith, which connectors each have a length to define a cavity between the sheets, said bladder being suspended from a ceiling of a passageway in a mine; anda foam disposed within the cavity and becoming rigid in situ and making the sheets substantially air impermeable, and being formed of a flowable hardenable material introduced into the cavity, the foam formed of a low density material in a range of between about 0.5 to about 5 pounds of the hardenable material per cubic foot of foam,whereby a light-weight stopping is defined in the passageway of the mine.