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Class Information
Number: 162/249
Name: Paper making and fiber liberation > Apparatus > Digester > Forced circulation or percolation of fluid only > With heating
Description: Apparatus having means to either maintain or cause a rise in temperature in either stock undergoing treatment or the treating chemical.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7105076 |
Gas phase continuous digester having an inverted top separator with liquor injection |
Sep. 12, 2006 |
| 6379504 |
Apparatus for pulping sawdust |
Apr. 30, 2002 |
| 6174411 |
Continuous digester with inverted top separator |
Jan. 16, 2001 |
| 6139689 |
Apparatus for digesting pulp in a displacement batch digester that uses displacement liquor having a sufficient hydrostatic head |
Oct. 31, 2000 |
| 6113742 |
Digester having screening arrangement for isothermal cooking of fibrous material |
Sep. 5, 2000 |
| 6071375 |
Gas purge protection of sensors and windows in a gas phase processing reactor |
Jun. 6, 2000 |
| 6024837 |
Low temperature gas phase continuous digester |
Feb. 15, 2000 |
| 5766413 |
Process for isothermal cooking pulp in a continuous digester |
Jun. 16, 1998 |
| 5716497 |
Method and device for the continuous cooking of pulp |
Feb. 10, 1998 |
| 5679217 |
Method and apparatus for optimizing the liquor-to-wood ratio during the production of paper pulp |
Oct. 21, 1997 |
| 5547012 |
Dissolved solids control in pulp production |
Aug. 20, 1996 |
| 5489363 |
Pulping with low dissolved solids for improved pulp strength |
Feb. 6, 1996 |
| 5479792 |
Heating arrangement |
Jan. 2, 1996 |
| 5413677 |
Method for producing chemical pulp from hardwood chips |
May. 9, 1995 |
| 5346591 |
Apparatus for treatment of chips with heated black liquor |
Sep. 13, 1994 |
| 5302247 |
Top circulation line cooling for a modified cook digester |
Apr. 12, 1994 |
| 5256255 |
Displacement heating in continuous digesters |
Oct. 26, 1993 |
| 5236554 |
Digester having plural screens with means for controlling liquid injection and withdrawal |
Aug. 17, 1993 |
| 5236553 |
Continuous cooking with reduced horsepower and pulp degradation |
Aug. 17, 1993 |
| 5192396 |
Process for the continuous digestion of cellulosic fiber material |
Mar. 9, 1993 |
| 5164042 |
Method and plant for producing high-yield pulp from pulp chip material containing lignocellulose |
Nov. 17, 1992 |
| 5114540 |
Apparatus for chemical treatment of lignocellulosic materials |
May. 19, 1992 |
| 5080755 |
Process for the continuous digestion of cellulosic fiber material |
Jan. 14, 1992 |
| 5069752 |
Digester screen switching |
Dec. 3, 1991 |
| 5059284 |
Apparatus to displace a digester from both ends |
Oct. 22, 1991 |
| 5053108 |
High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
Oct. 1, 1991 |
| 5021127 |
Extended delignification in pressure diffusers |
Jun. 4, 1991 |
| 4818295 |
Cyclone reactor |
Apr. 4, 1989 |
| 4764254 |
Falling film liquor heater having a screen to prevent clogging of a liquid distributing tray |
Aug. 16, 1988 |
| 4601787 |
Method of bringing a digester up to cooking temperature |
Jul. 22, 1986 |
| 4193839 |
Flow control method and apparatus for continuous wood chip digester screenless liquor extractor |
Mar. 18, 1980 |
| 4188261 |
Method of improving the homogeneity of lignocellulose containing material |
Feb. 12, 1980 |
| 4123318 |
Three-vessel treatment system |
Oct. 31, 1978 |
| 4120748 |
Digester system for delivering wood chips in an even layer into a digester |
Oct. 17, 1978 |
| 4104113 |
Two-stage digestion with between vessel heating |
Aug. 1, 1978 |
| 4061193 |
Method and apparatus for digesting cellulose material without screening digesting liquid withdrawn through the digester top |
Dec. 6, 1977 |
| 3941650 |
Continuous digester |
Mar. 2, 1976 |
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