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Richard O Laakso, 7022 Oakwood Dr, Queensbury, NY 12804

Richard Laakso Phones & Addresses

22 Oakwood Dr, Queensbury, NY 12804   

Glens Falls, NY   

Spring Hill, FL   

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Resumes

Resumes

Richard Laakso Photo 1

Richard Laakso

Location:
Glens Falls, New York Area
Industry:
Paper & Forest Products
Richard Laakso Photo 2

Richard Laakso

Publications

Us Patents

Chip Feeding To A Comminuted Cellulosic Fibrous Material Treatment Vessel

US Patent:
6368453, Apr 9, 2002
Filed:
Mar 7, 2000
Appl. No.:
09/520761
Inventors:
Auvo K. Kettunen - Neuvoton,
Richard O. Laakso - Queensbury NY
C. Bertil Stromberg - Glens Falls NY
J. Robert Prough - Glens Falls NY
Jay J. Miele - Queensbury NY
Assignee:
Andritz Inc. - Glens Falls NY
International Classification:
D21C 706
US Classification:
162 52, 162238, 162246, 162253
Abstract:
In the feeding of a slurry of comminuted cellulosic fibrous material to a digester (continuous or batch) in the production of chemical pulp, one of the tanks used in the feed system (which preferably includes a high pressure feeder) may be eliminated without consequent loss of its function by providing a single tank with the combined functions of controlling the level of liquid in a slurrying conduit which supplies slurry to a slurry pump, and storing and substantially continuously supplying liquid to a make-up liquid pump connected to the digester. The single tank preferably surrounds the slurrying conduit and is substantially concentric, and in liquid communication, with it. A gap of 3-48 inches may be provided between the bottom of the conduit and a connection to the slurry pump. A screen or strainer may be provided in the gap, which is substantially surrounded by the tank. The return system from the low pressure outlet of the high pressure feeder to the slurrying device (like the conduit and tank surrounding it, or a conventional clip tube) may be devoid of one or more of an in-line drainer, level tank, centrifugal separator, and surge tank.

Low Dissolved Solids Control In Pulp Production

US Patent:
5849150, Dec 15, 1998
Filed:
Dec 30, 1996
Appl. No.:
8/775197
Inventors:
Bruno S. Marcoccia - South Glens Falls NY
J. Robert Prough - Queensbury NY
Richard O. Laakso - Queensbury NY
Joseph R. Phillips - Queensbury NY
Rolf C. Ryham - Roswell GA
Jan T. Richardsen - Glens Falls NY
R. Fred Chasse - Queensbury NY
Assignee:
Ahlstrom Machinery Inc. - Glens Falls NY
International Classification:
D21C 714
US Classification:
162 42
Abstract:
Kraft pulp of increased strength and bleachability may be produced with decreased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entire kraft cook, including by extracting high DOM liquid from at least one part of a continuous digester and replacing it with much lower level DOM liquid. Existing pulp mills having two-vessel hydraulic, one-vessel hydraulic, or other systems may be retrofit to provide for extractions and additions of low DOM dilution liquor (including substantially DOM-free white liquor). Also, commercial size batch digesters (8 tons per day of pulp or more) can be operated with low DOM liquor to produce increased strength pulp. Using dilution with low DOM liquor also results in reduced H factor and effective alkali consumption, and increased bleachability.

Continuous Digester Having Means For Implementing Low Dissolved Solids Profiling

US Patent:
5849151, Dec 15, 1998
Filed:
May 27, 1997
Appl. No.:
8/863908
Inventors:
Bruno S. Marcoccia - South Glens Falls NY
J. Robert Prough - Queensbury NY
Richard O. Laakso - Queensbury NY
R. Fred Chasse - Queensbury NY
Assignee:
Ahlstrom Machinery Inc. - Glens Falls NY
International Classification:
D21C 714
US Classification:
162 42
Abstract:
Digester systems for producing paper pulp from comminuted cellulosic fibrous material take into account the level of dissolved organic materials (DOM), such as lignin, hemi-cellulose, and cellulose, maintaining the DOM level at about 100 g/l throughout the cook (particularly kraft cook). In order to make sure there is sufficient liquid to slurry the material in the feed system of a two vessel system, some liquid is withdrawn from the circulation conduits between the digester and impregnation vessel, cooled, and fed to the feed system. In a vapor phase digester, the level of liquid at the top of the digester is more precisely controlled by circulating some of the withdrawn liquid from a circulatory loop of the digester to the level tank associated with the feed system. An in-line drainer may be provided in the feed system between a make-up liquor pump and a liquid inlet conduit leading to the top of an impregnation vessel. Within the digester, a set of extraction/dilution screens is provided specifically positioned and spaced from each other, and with respect to a reintroduction conduit opening, so that mixing of different DOM concentration liquids is minimized.

Method Of Controlling Pulp Digester Pressure Via Liquor Extraction

US Patent:
6132556, Oct 17, 2000
Filed:
Sep 4, 1998
Appl. No.:
9/192210
Inventors:
C. Bertil Stromberg - Glens Falls NY
J Robert Prough - Queensbury NY
Bruno S. Marcoccia - S. Glens Falls NY
Richard O. Laakso - Queensbury NY
Carl L. Luhrmann - Glens Falls NY
Assignee:
Andritz-Ahlstrom Inc. - Glens Falls NY
International Classification:
D21C 714
US Classification:
162 41
Abstract:
A method of controlling the pressure of a vertical continuous comminuted cellulosic fibrous material (wood chip) digester is provided using a pressure-control extraction in a zone relatively insensitive to changes in the flow rate of liquid introduction or removal. The method comprises controlling the pressure in the digester primarily (or substantially exclusively) by varying the flow rate of liquor extracted from the pressure-control extraction to maintain the pressure in the digester at a desired superatmospheric level while avoiding non-uniform, unstable material movement in the counter-current washing zone; and introducing dilution liquid into the digester at the at least one recirculation-dilution loop. The pressure-control extraction is preferably substantially the upper extraction in the digester. Substantially except during excessive over pressure and under pressure conditions the extraction flow from the main extraction is maintained substantially constant.

Continuous Digester With A Low Temperature Gas-Phase

US Patent:
5882477, Mar 16, 1999
Filed:
Feb 10, 1997
Appl. No.:
8/797327
Inventors:
Richard Laakso - Queensbury NY
C. Bertil Stromberg - Glen Falls NY
Assignee:
Ahlstrom Machinery, Inc. - Glen Falls NY
International Classification:
D21C 700
D21C 326
US Classification:
162 63
Abstract:
A cellulose pulp continuous digester (e. g. for producing kraft pulp) is operated so that it has the advantages of a hydraulic digester yet has a gas-filled zone over the liquid level. A slurry of chips and cooking liquor is introduced into the top of the digester vessel through an inverted top separator. A liquid level is established below the inverted top separator, and a chips level is established below the inverted top separator (above or below the liquid level). A gas-filled zone above the liquid level includes compressed gas, and is at a temperature of less than 160 (preferably less than 120). degree. C. and at a pressure of between 50-200 (preferably 80-150) psig. The chips are heated by recirculating and heating liquid using a recirculation loop below the chips level, and a countercurrent flow zone is preferably provided.

Method For Selectively Increasing The Sulfide Ion Concentration And Sulfidity Of Kraft Cooking Liquor During Kraft Cooking Of Wood

US Patent:
5575890, Nov 19, 1996
Filed:
Aug 18, 1994
Appl. No.:
8/291918
Inventors:
J. Robert Prough - Queensbury NY
Bruno S. Marcoccia - South Glens Falls NY
Richard O. Laakso - Queensbury NY
Carl L. Luhrmann - Glens Falls NY
Assignee:
Kamyr, Inc. - Glens Falls NY
International Classification:
D21C 326
US Classification:
162 34
Abstract:
The sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of cellulose pulp is selectively increased. After treatment in a first treatment zone in which impregnation or kraft cooking takes place using a kraft cooking liquor having a first sulfide ion concentration and sulfidity, black liquor is extracted from the material, liquid is withdrawn from the material and dilution liquid is added to the withdrawn liquid and the withdrawn liquid with dilution liquid is reintroduced. In a second treatment zone after the first zone a second kraft cooking liquor is introduced having a second sulfide ion concentration and sulfidity greater than the first sulfide ion concentration and sulfidity (typically by about 20-50%), including by manipulating controlling the flow rate of extraction and the flow rates of withdrawal of liquid and addition of dilution liquid. The pressure of the continuous digester is controlled in a unique manner that avoids disruptions to the column of pulp continuously moving downwardly in the digester, anywhere in the digester, but particularly avoids non-uniform, unstable material in the countercurrent washing zone. The pressure is controlled by withdrawing liquid from, and introducing liquor into, the digester at at least one additional extraction-dilution loop aside from the main extraction of the digester and the wash dilution liquid introduction mechanism below the wash screens.

Dissolved Solids Control In Pulp Production

US Patent:
5547012, Aug 20, 1996
Filed:
Sep 28, 1993
Appl. No.:
8/127548
Inventors:
Bruno S. Marcoccia - South Glens Falls NY
J. Robert Prough - Queensbury NY
Richard O. Laakso - Queensbury NY
Joseph R. Phillips - Queensbury NY
Rolf C. Ryham - Roswell GA
Jan T. Richardsen - Glens Falls NY
R. Fred Chasse - Queensbury NY
Assignee:
Kamyr, Inc. - Glens Falls NY
International Classification:
D21C 714
US Classification:
162 42
Abstract:
Kraft pulp of increased strength and bleachability may be produced with decreased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entire kraft cook, including by extracting high DOM liquid from at least one part of a continuous digester and replacing it with much lower level DOM liquid. Existing pulp mills having two-vessel hydraulic, one-vessel hydraulic, or other systems may be retrofit to provide for extractions and additions of low DOM dilution liquor (including substantially DOM-free white liquor). Also, commercial size batch digesters (8 tons per day of pulp or more) can be operated with low DOM liquor to produce increased strength pulp. Using dilution with low DOM liquor also results in reduced H factor and effective alkali consumption, and increased bleachability.

Pulping With Low Dissolved Solids For Improved Pulp Strength

US Patent:
5489363, Feb 6, 1996
Filed:
May 4, 1993
Appl. No.:
8/056211
Inventors:
Bruno S. Marcoccia - South Glens Falls NY
J. Robert Prough - Queensbury NY
Richard O. Laakso - Queensbury NY
Joseph R. Phillips - Queensbury NY
Rolf C. Ryham - Roswell GA
Jan T. Richardsen - Glens Falls NY
R. Fred Chasse - Queensbury NY
Assignee:
Kamyr, Inc. - Glens Falls NY
International Classification:
D21C 700
D21C 714
US Classification:
162 43
Abstract:
Kraft pulp of increased strength (e. g. at least about 15% greater tear strength at a specified tensile for fully refined pulp, and as much as about 27%) is produced by keeping the dissolved organic material (DOM) concentration below about 100 g/l (e. g. <50 g/l) throughout substantially the entire kraft cook. This may be done by extracting liquor containing a level of DOM substantial enough to adversely affect pulp strength, and replacing some or all of the extracted liquor with liquor containing a substantially lower effective DOM level than the extracted liquor, so as to positively affect pulp strength. The replacement liquor may be water, white liquor, pressure heat treated black liquor, washer filtrate, cold blow filtrate, or combinations, or the extracted liquor can be treated to remove or passivate the DOM (e. g. by precipitation, ultrafiltration, or absorption). The extraction and dilution provided is practiced at a number of different stages during kraft cooking, such as at three or more different levels in a continuous digester, or by continuously flowing low DOM concentration liquor through a batch digester.

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