US Patent 8191466 Rotary screw blancher with fluid passage and fluid agitation

A food processing apparatus including a tank having an inlet end for receiving food product and an outlet end for discharging food product, the tank having an inner wall defining a compartment and including a solid, imperforate wall portion, fluid being contained in the compartment, and a rotatable auger mounted in the compartment, the auger for advancing food product within the compartment from the inlet end toward the outlet end, the auger including flights having a flight wall with a radial edge, a clearance space being defined between the radial edge of the flights and the solid, imperforate wall portion of the inner wall. Flow of fluid through the clearance space may be inhibited. One of the inner wall and the flight wall may include a perforated wall portion. Flow of fluid between the first auger section and the second auger section may be provided through the perforated wall portion.