Patent ID: 6074700
Filing Date: 2000-06-13
Classification: B01D,D21H

Abstract:
A method for separating foreign material from coating mix flowing in a circulation system for a coating station used for coating a web of paper or board, the method comprising:conveying coating mix from a storage tank to a coating station where the coating mix is applied to a surface of a web of paper or board to be coated;returning excess coating mix from the coating station to the storage tank;screening the coating mix with a pressure screen after the coating mix leaves the storage tank and before the coating mix arrives at the coating station so that an accepts fraction of the coating mix from the pressure screen is conveyed to the coating station and so that a rejects fraction of the coating mix is discharged from the pressure screen; andscreening the rejects fraction of the coating mix discharged from the pressure screen through a vibrating screen so that an accepts fraction of the coating mix from the vibrating screen is conveyed to the storage tank.