The Black Clawson Company

Thermo Black Clawson Inc.

John J Pimley

Paul G Marsh

Christopher M Vitori

Irenee J Phillippe

Zoned pressure screen

Apparatus for separating contaminant particles from liquid suspension stock, e.g. in the de-inking of used news print, is characterized by one or more of a plurality of features which contribute to increasing the capacity and effectiveness of the apparatus, including the provision of a cell comprising inner and outer annular chambers of substantially equal depth with the inlet and outlet connections for the stock being located adjacent the bottoms of the two chambers to force the stock to travel through the full depth of each chamber, and also the provision of a baffle of substantial width on the top of the wall between the two chambers to spread the stock overflowing that wall into a thin film. Other features include the use of an explosion-type flowbox to aerate the stock as it is delivered to froth flotation apparatus, and the provision of a variety of alternative constructions for spreading aerated grey stock into a film and causing that film to flow a substantial distance in a substantially horizontal plane in order to minimize the distance for travel of bubbles in the stock to the top of the film and thereby to expedite the resulting formation of a layer of froth at top of the film.

Froth flotation apparatus and method

A system for the recovery of paper-making fiber from contaminated waste paper products including plastic film and other lightweight non-paper contaminants includes a novel rotary screening machine comprising a perforated drum rotatable about a generally horizontal axis and having openings at opposite ends for the delivery of liquid and paper furnished to the drum and the discharge of contaminants, respectively, a plurality of vanes for lifting material from the bottom of the drum to an upper region as the drum rotates, and a rotor mounted within the drum and having blades which are disposed in spaced relation to the drum vanes in a position to intercept material falling from the upper region of the drum and fling it back against the drum. The resulting fibers or flakes of useful paper are washed through the drum perforations while the rejected contaminants are conveyed to and removed via the discharge end of the drum.

Growing community of inventors

Gwent, United Kingdom

John J Pimley