| 摘要 |
A process for flameproofing hardwood is described in which the wood is treated with an aqueous formulation, preferably by dipping, under a static excess pressure of 0.3 to 2.5 bars, the formulation containing (a) at least one flameproofing agent, for example ammonium salts of phosphoric acid, (b) optionally a fixing agent, for example thickeners of natural or synthetic origin or reaction products of at least urea or cyanamides and formaldehyde and (c) optionally a blowing agent, for example urea or derivatives thereof. An apparatus for carrying out the process by dipping in a continuous procedure comprises a u shaped tube 1 filled with treating liquid to a depth h of 3 to 25 metres and containing a conveyor in the form of chains 6 and carrier rails 7 to move timbers 8 through the tube. The treated wood has a permanent flameproof finish and is used in particular in the form of eucalyptus timber in mining. <IMAGE> |
