Patent ID: 7980497

Claim:
A pulper for comminuting and suspending paper stock, said pulper comprising: a container having a substantially cylindrical side wall and a bottom including at least one truncated cone concentric with said substantially cylindrical side wall, said container being configured to mix the paper stock with water and to comminute and suspend the paper stock to form a suspension containing the paper stock and said at least one truncated cone being a plurality of truncated cones joined to one another and including a largest truncated cone having a largest diameter adjoining said side wall, said plurality of truncated cones being arranged such that an internal diameter of each of said plurality of truncated cones decreases from top to bottom; and a driven rotor positioned at said bottom of said container, said driven motor configured to produce a circulating flow in said container and a center of said rotor arranged eccentrically to a center of said container.