Stucco paper screen assembly

A screen assembly, comprising:

• a housing defining a material flow chamber and having an inlet end and an outlet end;
• a stucco discharge opening being located in said chamber between said inlet end and said outlet end;
• an auger shaft located in said housing for axial rotation and having at least one first helical flight arranged in a flight pattern oriented so that a first material engaging said first helical flight is conveyed from said inlet end to said outlet end;
• a screen surrounding said at least one first helical flight for common rotation and extending generally from said inlet end to said outlet end, said screen is fabricated from perforated sheet material, said screen is provided in a plurality of semi-cylindrical segments individually attachable to said at least one first flight;
• at least one second helical flight disposed on an exterior surface of said screen and arranged in a flight pattern oriented so that a second material, distinct from the first material, passing through said screen and engaging said second helical flight is conveyed in an opposite direction from the first material engaging said first helical flight, and from said outlet end toward said stucco discharge opening;
• and
• a plurality of air knives constructed and arranged for directing compressed air to said screen for dislodging material caught on an interior surface of said screen;
• and
• said plurality of air knives includes a first plurality of knives at a first height in operational relationship to said exterior surface of said screen, and a second plurality of knives at a second height distinct from said first height in operational relationship to an outer edge of said at least one second flight.

A screen assembly, comprising:

• a housing defining a material flow chamber and having an inlet end and an outlet end;
• a stucco discharge opening being located in said chamber between said inlet end and said outlet end;
• an auger shaft located in said housing for axial rotation and having at least one first helical flight arranged in a flight pattern oriented so that a first material engaging said first helical flight is conveyed from said inlet end to said outlet end;
• a screen surrounding said at least one first helical flight for common rotation and extending generally from said inlet end to said outlet end, said screen is fabricated from perforated sheet material, said screen is provided in a plurality of semi-cylindrical segments individually attachable to said at least one first flight;
• at least one second helical flight disposed on an exterior surface of said screen and arranged in a flight pattern oriented so that a second material, distinct from the first material, passing through said screen and engaging said second helical flight is conveyed in an opposite direction from the first material engaging said first helical flight, and from said outlet end toward said stucco discharge opening;
• a plurality of air knives constructed and arranged for directing compressed air to said screen for dislodging material caught on an interior surface of said screen;
• said plurality of air knives includes a first plurality of knives at a first height in operational relationship to said exterior surface of said screen, and a second plurality of knives at a second height distinct from said first height in operational relationship to an outer edge of said at least one second flight;
• and
• a power unit and a power transmission system connected to said power unit for rotating in common said shaft, said at least one first flight, said screen and said at least one second flight.