摘要 |
An improved brattice cloth construction and method of utilizing the same in the ventilation of underground mines comprising a coherent, strong felt formed from a thick batting or mat of textile staple fibers needle-punched into dense, tightly intertwined and interlocking engagement, a flame retarding chemical impregnant in sufficient amount to impart to felt an acceptable flame resistance, and preferably an openwork substrate disposed within the staple fiber felt with staple fibers needle-punched therethrough and interconnected therewith.
|