Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1997-09-23
1999-11-16
Nguyen, Dean T.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 52, 162246, 162251, 210422, 220661, 220669, 422239, 422292, D21C 700
Patent
active
059850965
ABSTRACT:
In a vertical digester for producing chemical pulp, or other vessel for treating a slurry of comminuted fibrous cellulosic material, the cost of manufacturing the shell is significantly reduced by eliminating the external step increases in the digester shell. The digester shell has a substantially constant internal diameter from just below the inlet to just above the outlet, screen assemblies being provided by an internal transition (e.g. conical) having an angle of convergence of less than 40.degree. (e.g. about 10-25.degree.) above each screen assembly so that the slurry flows through the transition without bridging or hang-up, and a step increase, or other increase, in diameter back to the first diameter after the screen assembly.
REFERENCES:
patent: 2459180 (1949-01-01), Richter
patent: 2695232 (1954-11-01), Richter
patent: 2803540 (1957-08-01), Durant et al.
patent: 2858211 (1958-10-01), Durant et al.
patent: 2938824 (1960-05-01), Richter
patent: 3007839 (1961-11-01), Richter
patent: 3035963 (1962-05-01), Schnyder
patent: 3041232 (1962-06-01), Richter et al.
patent: 3097987 (1963-07-01), Sloman
patent: 3200032 (1965-08-01), Richter et al.
patent: 3243341 (1966-03-01), Lang
patent: 3298899 (1967-01-01), Laakso
patent: 3303088 (1967-02-01), Gessner
patent: 3380883 (1968-04-01), Richter et al.
patent: 3388038 (1968-06-01), Ilander
patent: 3413189 (1968-11-01), Backlund
patent: 3425898 (1969-02-01), Laakso
patent: 3427218 (1969-02-01), Richter
patent: 3429773 (1969-02-01), Richter
patent: 3445328 (1969-05-01), Laakso
patent: 3532594 (1970-10-01), Richter
patent: 3579418 (1971-05-01), Ostberg
patent: 3579421 (1971-05-01), Richter
patent: 3711367 (1973-01-01), Christenson
patent: 3802956 (1974-04-01), Backlund
patent: 3811994 (1974-05-01), Ostberg
patent: 4028171 (1977-06-01), Richter
patent: 4057461 (1977-11-01), Richter
patent: 4092212 (1978-05-01), Richter et al.
patent: 4146422 (1979-03-01), Prough
patent: 4174997 (1979-11-01), Richter
patent: 4547264 (1985-10-01), Sherman et al.
patent: 4670098 (1987-06-01), Thorsell et al.
patent: 4958741 (1990-09-01), Johanson
patent: 5069752 (1991-12-01), Richter
patent: 5346591 (1994-09-01), Henricson
patent: 5470437 (1995-11-01), Oulie et al.
patent: 5489363 (1996-02-01), Marcoccia et al.
patent: 5500083 (1996-03-01), Johanson
patent: 5536366 (1996-07-01), Marcoccia et al.
patent: 5547012 (1996-08-01), Marcoccia et al.
patent: 5575890 (1996-11-01), Prough et al.
patent: 5578554 (1996-11-01), Richter
patent: 5617975 (1997-04-01), Johanson et al.
patent: 5628873 (1997-05-01), Johanson et al.
patent: 5635026 (1997-06-01), Kettunen et al.
Johanson Jerry R.
Marcoccia Bruno S.
Phillips Joseph R.
Prough J. Robert
Stromberg C. Bertil
Ahlstrom Machinery Inc.
Nguyen Dean T.
LandOfFree
Vertical pulping digester having substantially constant diameter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical pulping digester having substantially constant diameter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical pulping digester having substantially constant diameter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1319461