Patent ID: 8991733
Filing Date: 2015-03-31
Classification: D21B,D21D,F16L

Abstract:
1. A pulper for comminuting and suspending a fibrous material, the pulper comprising: a vat; at least one rigid screen with a screen surface having a plurality of screen openings, each of said screen openings defined by at least one first arc having a first radius and at least one second arc having a second radius, said first radius being greater than said second radius, said at least one first arc tangentially adjoining said at least one second arc, thereby defining a bounded curve, each of said plurality of screen openings being rotated in its orientation relative to each adjacent screen opening; and at least one rotor arranged in said vat for circulating a fibrous stock suspension, said rotor passing over at least a greatest portion of the screen surface of said at least one rigid screen.