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A powder feed hopper includes a housing which mounts a porous plate adapted to support particulate powder material and receive an upwardly directed flow of fluidizing air to form an air-entrained fluidized bed in the housing above the porous plate. In order to improve fluidization, a baffle plate is

A powder feed hopper includes a housing which mounts a porous plate adapted to support particulate powder material and receive an upwardly directed flow of fluidizing air to form an air-entrained fluidized bed in the housing above the porous plate. In order to improve fluidization, a baffle plate is mounted beneath the porous plate in the path of the pressurized air discharged from one or more air nozzles to create a circulating flow of air-entrained particulate powder material within the fluidized bed in which the flow moves upwardly along the wall of the housing and then inwardly and downwardly toward the center of the porous plate. Additionally, stirrer blades are located immediately above the porous plate to create turbulence and reduce the formation of concentrated channels of air atop the porous plate.

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A powder feed hopper, comprising: a housing having an outer wall which defines a hollow interior; a fluidizing plate mounted to said wall within said hollow interior of said housing, said fluidizing plate having a top surface adapted to support particulate powder material and a bottom surface, said

A powder feed hopper, comprising: a housing having an outer wall which defines a hollow interior; a fluidizing plate mounted to said wall within said hollow interior of said housing, said fluidizing plate having a top surface adapted to support particulate powder material and a bottom surface, said fluidizing plate defining a fluidized bed within said housing above said top surface thereof and a plenum within said housing beneath said bottom surface thereof; means for introducing pressurized air into said plenum at a location beneath said bottom surface of said fluidizing plate, the pressurized air flowing upwardly toward said fluidizing plate; a baffle plate having an outer periphery, said baffle plate being mounted within said plenum in the path of said pressurized air flowing toward said fluidizing plate so that said baffle plate is spaced a predetermined distance from said bottom surface of said fluidizing plate and so that said outer periphery of said baffle plate is spaced a predetermined distance from said outer wall of said housing forming a space therebetween, said baffle plate being effective to direct said pressurized air introduced into said plenum through said space between said outer wall of said housing and said outer periphery of said baffle plate prior to passage of said pressurized air through said fluidizing plate.