Patent ID: 8685188
Filing Date: 2014-04-01
Classification: B28B,B28C

Abstract:
1. A machine for manufacturing gypsum board with a gypsum core covered with a sheet of paper for gypsum board liner, comprising: a chute section having a slurry discharge port for feeding gypsum slurry for the gypsum core to a widthwise center part of a sheet of paper for gypsum board liner with a stable density and pressure; a single mixer having a housing and a mixing area therein for the mixing of calcined gypsum and water for preparation of a gypsum slurry; a hollow connector section having an inlet end opening directly to the mixing area for receiving the gypsum slurry directly from the mixing area and an outlet end opening directly to the chute section for providing a continuous flow of the gypsum slurry from the mixing area into the chute section by pressure of the mixer only, with a stable density and pressure; a slurry delivery conduit having a stable slurry flow rate; a slurry fractionation port disposed on a top wall of at least one of the chute section and the hollow connector section and in fluid communication with the slurry delivery conduit for receiving a part of the gypsum slurry from the mixer through at least one of the chute section and the hollow connector section, for continuously fractionating the received gypsum slurry in at least one of the chute section and the hollow connector section with a stable density and flow rate by the pressure of the mixer only, and for delivering the fractionated gypsum slurry to the slurry delivery conduit for at least one of a roll coater and a side edge portion of the sheet, by fluid pressure of the gypsum slurry only: a valve for opening and closing the slurry fractionation port, and for controlling the pressure of the slurry fractionated through the slurry fractionation port; and a casing which encloses the slurry fractionation port and the valve and which has a slurry delivery port, wherein the slurry delivery conduit is connected to the slurry delivery port so as to be in fluid communication with the slurry fractionation port through an internal area of the casing.