Patents
Sitemap › D21 - Paper-making; Production of cellulose › D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor › D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265)
04/1981
04/21/1981US4263239 Dry forming of fibrous material
04/21/1981CA1099456A1 Process for simultaneously drying mechanical wood pulp and improving mechanical strength and brightness of the pulp
04/14/1981CA1099216A1 Method and apparatus for treating liquid-containing substance mixtures, particularly fibre suspensions
04/14/1981CA1099058A1 Process for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification of lignocellulosic material
03/1981
03/31/1981US4259150 Plural stage mixing and thickening oxygen bleaching process
03/31/1981US4259149 Chromatography of effluents from chlorination, oxidation, and caustic extraction
03/31/1981CA1098260A1 Process for the acid bleaching of cellulose pulp with peroxides
03/24/1981CA1098046A1 Apparatus and method for filtering a fibrous material with a disc filter
03/10/1981US4255233 Chlorination
03/10/1981CA1097119A1 Apparatus for treating cellulosic material with gaseous agent
03/03/1981US4253912 High chlorine resistance, calcium tolerance
03/03/1981US4253822 Drying wood pulp
03/03/1981CA1096678A1 Chip dryer
03/03/1981CA1096591A1 Displacement of a liquid a by a liquid b in a suspension
02/1981
02/19/1981WO1981000422A1 Process for the preparation of fibers
02/17/1981CA1095765A1 Displacement bleaching temperature control
01/1981
01/13/1981US4244780 Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness
01/13/1981US4244778 Process for the chemical refining of cellulose pulp
01/13/1981US4244777 Bleaching stilbene yellow dyed wood pulp
01/06/1981CA1092804A1 Drying wood pulp
12/1980
12/30/1980CA1092405A1 Dual belt pulp washer
12/16/1980US4239906 Method for obtaining a purified cellulose product from corn hulls
12/16/1980CA1091494A1 Stockwasher
12/10/1980EP0019963A1 Process for the delignification and bleaching of chemical and semichemical cellulose pulps
12/09/1980US4238282 Chemical treatments in bleaching stages which increase pulp brightness
12/09/1980US4238281 Simplified bleaching process
12/09/1980CA1091072A1 Method for treating refined mechanical pulp and thermo mechanical pulp with ozone
12/02/1980CA1090711A1 Disk filter
12/02/1980CA1090510A1 Delignification and bleaching of a lignocellulosic pulp slurry with ozone
11/1980
11/12/1980EP0018562A1 Apparatus for continuous treatment of pulp
11/11/1980CA1089372A1 Method of and apparatus for flow spreading
11/11/1980CA1089161A2 Bleached kraft pulp mill operation
11/04/1980CA1088791A1 Pulp washer
10/1980
10/29/1980EP0018287A1 Process for the delignification of unbleached chemical paper pulp
10/28/1980CA1088361A1 Plural stage mixing and thickening oxygen reacting
10/28/1980CA1088261A1 Process for the delignification of a cellulose- containing material with an oxidizing gas in an aklaline milieu
10/21/1980US4229252 Additives for ozone bleaching
10/21/1980US4229250 Method of improving properties of mechanical paper pulp without chemical reaction therewith
10/15/1980EP0017544A1 Process for preparing a paper pulp
10/14/1980US4227964 Method of treating lignocellulosic or cellulosic pulp to promote the kinking of pulp fibres and/or to improve paper tear strength
10/14/1980CA1087355A1 Preparation of liquor for delignification or alkali treatment by autocaustisation and the preparation of pulp with this liquor
10/14/1980CA1087354A1 Process for alkali cooking and delignifying cellulosic materials
10/07/1980CA1087010A1 Energy-efficient system for controlling pulp flow through process section of a bleachery
10/07/1980CA1087009A1 Method for treating finely divided bulk material and a reactor plant for carrying out the method
10/07/1980CA1086905A1 Bleach plant operation
09/1980
09/16/1980US4222819 Process for the acid bleaching of cellulose pulp with peroxides
09/16/1980US4222818 Method for treatment of lignocellulosic material with chlorine
09/16/1980CA1085610A1 Method and means for drying a fibre material containing cellulose
09/03/1980EP0014972A1 Method and apparatus for removing moisture from wet pulp
09/03/1980EP0014753A1 Process for improving the colour and for the deodorisation of sulphate pulp
09/03/1980EP0014713A1 A method of refining cellulose pulps.
09/02/1980US4220537 Drum type disc filter device for paper pulp slurry
09/02/1980US4220498 Delignification
08/1980
08/26/1980CA1084207A1 Process for the bleaching of cellulose pulp
08/19/1980US4218284 Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes
08/19/1980CA1083883A1 Compression rollers for dehydration equipment
08/19/1980CA1083870A1 Method for treating cellulose containing pulp
08/12/1980US4217363 Preservation of aqueous systems with α-chloro-β-aminocrotonamide
08/12/1980US4217170 Pulp washer discharging a low consistency pulp slurry
08/05/1980US4216054 Low-consistency ozone delignification
08/05/1980US4215447 Process and apparatus for washing fibre stock in the de-inking of paper
08/05/1980CA1082856A1 Process related to pulp bleaching
07/1980
07/29/1980CA1082608A1 Method and device for dewatering of suspensions in movement
07/22/1980US4213822 Apparatus for displacement washing of fibrous material suspended in a liquid
07/22/1980CA1082022A1 Pulp washer and pulp washing method
07/22/1980CA1081907A1 Process for bleaching cellulose-containing vegetable material
07/15/1980US4212239 Method and apparatus for removing moisture from wet pulp
07/08/1980CA1080912A1 Cellulosic pulp delignification using bromine
07/01/1980CA1080406A1 Bleach hydrolysis of pulp with substantially reduced use of chlorine
06/1980
06/24/1980US4209359 Process for removing residual oxygen from oxygen-bleached pulp
06/17/1980CA1079572A1 Disc press for continuous pressing of aqueous or suspended pulp
06/17/1980CA1079457A1 Manganic ion bleaching process
06/10/1980US4207141 Capacitance measurement
06/10/1980US4207140 Method of producing groundwood pulp
06/10/1980CA1079010A1 Process for preventing the separation of resins in paper making
06/03/1980US4205541 Stock washer
05/1980
05/14/1980EP0010543A1 Bleaching lignocellulose material with bleaching agents containing peroxide
05/13/1980CA1077435A1 Chlorine-based bleachery effluent treatment
05/06/1980CA1076794A1 Method and apparatus for drying disintegrated fiber mass
04/1980
04/29/1980CA1076306A1 Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulose material with alkaline sodium- and sulfur-containing sulfate pulping liquor
04/15/1980US4198267 Drying
04/15/1980US4198266 Oxygen delignification of wood pulp
04/01/1980US4196094 Removing deposits from surfaces in wood pulp processing apparatus
04/01/1980US4196043 Using ozone and an alkaline peroxide
04/01/1980CA1074608A1 Method of producing groundwood pulp
03/1980
03/20/1980WO1980000461A1 Twin belt vacuum washer
03/20/1980WO1980000460A1 Twin belt vacuum washer
03/20/1980WO1980000423A1 Method and device for cleaning suspension fibres
03/18/1980US4193839 Flow control method and apparatus for continuous wood chip digester screenless liquor extractor
03/18/1980CA1073720A1 Pulp washer
03/11/1980US4192708 Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical
02/1980
02/26/1980US4190522 Apparatus for purifying a suspension of fibrous material
02/26/1980CA1072263A1 Process for the reticulation of cellulosic fibers suspended in the air
02/19/1980CA1071805A1 Drainage and wet stretch improvement in mechanical pulps
02/12/1980US4188260 Water conservation, pollution control
02/12/1980CA1071358A1 Method of reducing waste stream pollutants by the control and separation of waste contaminants from a multi-stage cellulosic bleaching sequence
02/05/1980CA1070909A1 Nitrogen dioxide-oxygen delignification
02/05/1980CA1070908A1 Bleach plant filtrate recovery
02/05/1980CA1070907A1 Process for manufacturing chemimechanical cellulose pulp in a high yield within the range from 65 to 95%
01/1980
01/22/1980US4184967 Apparatus for clarifying waste water
1 ... 91 92 93 94 95 96 97 98 99 100 101 102 103