Patent ID: 7690834

Claim:
A mixer comprising a flattened and circular housing provided with an annular wall on its periphery; a rotary disc located in the housing to rotate in a predetermined rotational direction; a slurry outlet port opening on said annular wall to discharge from the housing, gypsum slurry mixed in the housing; a hollow connector section with an open end connected to said slurry outlet port and another open end connected to a substantially vertical and cylindrical slurry delivery conduit; a foam feeding port for feeding foam to the gypsum slurry, and an attachment having said slurry outlet port, said hollow connector section and said slurry delivery conduit detachably mounted on said annular wall, wherein said foam feeding port is provided on the annular wall on an upstream side of the slurry outlet port in the rotational direction so as to feed the foam to the gypsum slurry immediately before the gypsum slurry enters said slurry outlet port, or provided on said hollow connector section so as to feed the foam to the gypsum slurry flowing in the hollow connector section.