A - Human Necessities – 23 – F
Patent
A - Human Necessities
23
F
A23F 5/26 (2006.01) B01D 11/02 (2006.01) B01F 7/18 (2006.01)
Patent
CA 2139588
A method and apparatus for the continuous coun- tercurrent treatment of roast and ground coffee particles in which a bed of the coffee particles is suspended in an aqueous liquid and the suspended bed is agitated in a manner which facilitates removal of evolved coffee gases from the bed to thereby effect complete, uniform wetting and/or extraction of the coffee grounds. The apparatus comprises a tank (10) in which water flows upward from the bottom and is removed from the top of the tank, with fresh coffee grounds being fed onto the liquid at the top of the tank. Two pairs of interleaved blade assemblies (24, 25) are mounted in the tank for relatively counter rotation to submerge coffee particles into the aqueous liquid and form a bed of suspended coffee particles. A submerging auger (41), mounted on a central shaft (21) in the tank, facilitates submerging the coffee grounds in the liquid. Both pairs of blade as- sanblies, which are arranged one above the other, have a set of downwardly extending blade members and an opposed set of upwardly extending blade members inter- leaved with the downwardly extending blades. One of the sets of blade members in each pair is stationary and the other set of blade members is mounted for rotation on the central shaft. A screw conveyor (47) is mounted on the side of the tank at the base of the suspended bed to remove grounds from the base of the suspended bed and thereby control the height of the bed in the tank. Coffee grounds which settle to the bottom of the tank are removed by suitable means.
Borden Ladner Gervais Llp
Societe Des Produits Nestle S.a.
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