Peter E Leblanc

US Patent:

50097741, Apr 23, 1991

Filed:

Oct 30, 1989

Appl. No.:

7/429874

Inventors:

Peter E. LeBlanc - Worthington MA

Assignee:

Beloit Corporation - Beloit WI

International Classification:

B07B 120

US Classification:

209273

Abstract:

A screening apparatus comprises a pair of stationary concentric screens with a plurality of foils rotating therebetween and adjacent thereto, the individual foils being radially aligned. The screening apparatus comprises a tangentially disposed slurry inlet and a diametrically and tangentially disposed heavy rejects outlet at the end of a heavy rejects trap. The light reject/accepts slurry flows into the screening zone and, after separation, is discharged at an end of the screening apparatus by way of respective light rejects and accepts outlets. The accept outlet is located axially with respect to the screen cylinders and rotating foils so the pressure pulses are virtually eliminated in the screening process. The apparatus may be constructed for vertical or horizontal rotation of the foils.

US Patent:

51396521, Aug 18, 1992

Filed:

Dec 31, 1990

Appl. No.:

7/633527

Inventors:

Peter E. LeBlanc - Seminole FL

Assignee:

A. Ahlstrom Corporation - Karhula

International Classification:

B04C 504
B04C 5081
B04C 514

US Classification:

209211

Abstract:

A centrifugal cleaner has a cleaning quotient greater than 0. 5 and a rejects by weight performance value typically of less than 5% (e. g. less than 2%) for conventional paper pulp furnish. The tangential inlet nozzle to the side wall near the top of the cleaner body has a non-circular--preferably D-shaped--inlet opening so as to provide enhanced throughput. The cleaner body side wall includes an upper portion that is conical and extends past the top nozzle, a generally cylindrical center portion which significantly increases retention time within the cleaner, and a conical bottom portion in which a bottom nozzle is operatively disposed. The bottom nozzle has a rejects opening therein with a diameter that is about 25-45% (preferbly roughly 1/3) of the internal diameter of the side wall at the opening, and is about 25-45% (preferably roughly 1/3) of the internal diameter of the top nozzle. The bottom nozzle may have an insert with an interior three-dimensional parabolic surface terminating at its bottom in the rejects opening, or may comprise a flat plate with a main top surface perpendicular to the top nozzle. During use rejects particles collect on the flat plate top surface and define a generally parabolic configuration.

US Patent:

49815830, Jan 1, 1991

Filed:

Jun 8, 1989

Appl. No.:

7/363668

Inventors:

Peter E. LeBlanc - Worthington MA

Assignee:

Beloit Corporation - Beloit WI

International Classification:

B01D 2938

US Classification:

209273

Abstract:

A high consistency pressure screen comprises a screen including a profiled inner surface and a rotor including a profiled outer surface rotating adjacent and spaced from the profiled screen to produce a positive-negative pulsation cycle of approximately 50%--50%.

US Patent:

55870783, Dec 24, 1996

Filed:

Apr 1, 1994

Appl. No.:

8/221004

Inventors:

Peter LeBlanc - Queensbury NY

Assignee:

Ahlstrom Machinery Corporation - Noormarkku

International Classification:

B01D 2126

US Classification:

2105121

Abstract:

A centrifugal cleaner is constructed so that its efficiency is less sensitive to consistency changes of the feed slurry, and so that it can operate at a higher consistency than conventional cleaners, yet optimizes separation efficiency. This is accomplished by disposing a turbulence generator in the tangential inlet to the cleaner, the turbulence generator comprising an abrupt cross-sectional area reduction (e. g. a cross-sectional area of about 0. 1-0. 3 times as large as the cross-sectional area of the inlet) so as to break up fiber flocs and prevent reformation of the flocs. Existing centrifugal cleaners can easily be retrofit by the method of the invention to achieve the invention's advantages by inserting a turbulence generator into the inlet of an existing centrifugal cleaner. The tangential inlet leads to a hollow main body which includes a vortex finder located in the body top. Preferably the vortex finder has a first diameter and the hollow body has a second diameter at a portion surrounding the vortex finder, the first diameter being about 0. 25-0.

US Patent:

55247709, Jun 11, 1996

Filed:

Nov 7, 1995

Appl. No.:

8/553133

Inventors:

Peter LeBlanc - Worthington MA
David E. Ray - S. Portland ME

Assignee:

Beloit Technologies, Inc. - Wilmington DE

International Classification:

B07B 104

US Classification:

209273

Abstract:

A replaceable screen structure for a stock screen where stock slurry for making paper is passed through a screen with the rejects going to a reject outlet and the accepts passing through openings in the screen to an accepts outlet, with the screen having projections and a rotor inducing a pulsating induced flow along the profile surface, with projections on the surface having an inclined ramp of less than about 45. degree. and a 90. degree. downstream wall and accepts flow openings between the projections positioned closer to the upstream projection than the downstream projection.

US Patent:

52555402, Oct 26, 1993

Filed:

Jun 29, 1990

Appl. No.:

7/546119

Inventors:

Peter LeBlanc - Seminole FL
Goda Rangamannar - Pittsfield MA

Assignee:

Beloit Technologies, Inc. - Wilmington DE

International Classification:

D06B 300

US Classification:

68181R

Abstract:

A pressurized dynamic pulp washer in which stock is driven along a stationary wash wire and pulses are generated in the stock to urge liquid through openings in the wash wire. Wash liquid is introduced countercurrent to the flow of stock, and localized mixing and reslurrying occurs.

US Patent:

48550388, Aug 8, 1989

Filed:

Jun 20, 1985

Appl. No.:

6/746734

Inventors:

Peter E. LeBlanc - Worthington MA

Assignee:

Beloit Corporation - Beloit WI

International Classification:

B01D 2938

US Classification:

209273

Abstract:

A high consistency pressure screen comprises a screen including a profiled inner surface and a rotor including a profiled outer surface rotating adjacent and spaced from the profiled screen to produce a positive-negative pulsation cycle of approximatey 50%--50%.

US Patent:

51104563, May 5, 1992

Filed:

Oct 22, 1990

Appl. No.:

7/602436

Inventors:

Peter E. LeBlanc - Worthington MA

Assignee:

Beloit Corporation - Beloit WI

International Classification:

B01D 2938

US Classification:

209273

Abstract:

A high consistency pressure screen comprises a screen including a profiled inner surface and a rotor including a profiled outer surface rotating adjacent and spaced from the profiled screen to produce a positive-negative pulsation cycle of approximately 50%--50%.