STANLEY R PREW
Engineers in Williamsport, PA

5364038, Nov 15, 1994

May 11, 1993

8/060319

Stanley R. Prew - Williamsport PA

Andritz Sprout-Bauer, Inc. - Muncy PA

B02C 1304

2411891

A hammermill (10) comprises a casing (12) having a longitudinal axis (18) and a sidewall (20) such that an enclosed grinding space (24) is defined within the casing. A rotor assembly (26) is situated within the casing for rotation about the axis, and includes hammer elements each having a radially outer tip (34) which defines a hammer rotation diameter. At least one grinding plate at the inside of the sidewall defines a grinding surface (38) in the grinding space having a radius of curvature centered on the axis, a length dimension parallel to the axis, and a width dimension defined by an arc about the axis. The grinding plate has a plurality of spaced apart edges such that each hammer tip (34) passes along the width dimension of the grinding plate with a clearance from the edges which defines a grinding gap. The sidewall other than at the grinding plate has a non-uniform curvature which defines a non-uniform clearance from the hammer rotation diameter that is greater than the grinding gap clearance. The non-uniform curvature includes at least one sidewall portion having a radius of curvature less than that of the grinding surface.

5813618, Sep 29, 1998

Nov 28, 1995

8/563773

Stanley R. Prew - Williamsport PA

Andritz Sprout-Bauer, Inc. - Muncy PA

B02C 1900

2412591

A continuous cylindrical wood pulp refiner comprising a rotor disposed in a housing having a plurality of structural members. At least one refining plate is mounted to a holder portion of each member such that the entire periphery of the rotor is exposed to refining plates. The pulp to be refined continuously flows axially along the periphery of the rotor. The members define two shells which are pivotally mounted to the refiner base such that the shells may be pivoted away from each other to provide access to the interior surface for changing the refiner plates. Each holder portion has a pair of bores which are parallel to the axis of the rotor. A cam portion of a cam shaft is disposed in each bore. Rotating the cam shaft causes the cam portion to engage the surface of the bore thereby moving the holder portion radially towards or away from the rotor whereby the gap between the refining plates and the rotor can be adjusted. A gear is mounted on an end portion of each cam shaft which extends longitudinally outward through an orifice in the housing.

5257740, Nov 2, 1993

Sep 29, 1992

7/953660

Stanley R. Prew - Williamsport PA
Mark J. Seksinsky - Watsontown PA

Andritz Sprout-Bauer, Inc. - Muncy PA

B02C 1912, B02C 2336

241 21

An apparatus and process for recycling scrap film. The apparatus includes a washer-shredder upstream from a film cutter in order to remove impurities from the film. The scrap film is rinsed in a rinse loop which uses screen sieves for removing additional impurities, particularly paper fiber. The apparatus and method substantially reduce conventional problems with the film cutter caused by impurities which customarily are present in unwashed film. The invention is particularly useful for recycling very thin scrap film.