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)
11/1991
11/14/1991WO1991017307A1 Bleaching of chemical pulp
11/14/1991WO1991017306A1 Bleaching of chemical pulp
11/14/1991CA2080242A1 Bleaching of chemical pulp
11/13/1991EP0456626A1 Process for bleaching of lignocellulose-containing material
11/13/1991EP0456032A1 Process for bleaching pulps
11/12/1991US5063840 Deterring press
11/06/1991EP0455525A1 Digester screen switching
11/06/1991EP0454757A1 A method in the manufacture of cellulose pulp.
11/06/1991CN2088116U High-pressure thickener for washing paper pulp
11/06/1991CN1055975A Method for production of cotton pulp with waste cotton
11/05/1991CA1291749C Cross-linked microfibrillated cellulose prepared from pore generating particles
11/05/1991CA1291601C Detackification of adhesive materials contained in secondary fiber
10/1991
10/31/1991CA2041389A1 High performance paper pulp bleaching process using hydrogen peroxide
10/31/1991CA2041275A1 Digester screen switching
10/30/1991EP0453728A2 Method for recycling cellulose fibres and medical or hygienic absorbent articles
10/26/1991CA2041468A1 Method for bleaching pulps
10/22/1991US5058615 Method and apparatus for pumping high consistency pulp
10/17/1991WO1991015627A1 A process for the bleaching of chemical pulp
10/15/1991US5057334 Process for recovery of cellulose
10/12/1991WO1991015629A1 Method and device for separating a fibre suspension
10/09/1991EP0451031A1 Process for treating recycled waters intented to dilute a paper pulp
10/07/1991CA2039838A1 Treatment process of recycled water to be used for diluting pulp
10/03/1991WO1991014824A1 Membrane separation process
10/03/1991WO1991014822A1 A process using cellulase for improving drainage properties of pulp
10/02/1991EP0319563B1 Process for bleaching of materials with a dithionite solution
10/01/1991CA1289929C Movably supported screw press
09/1991
09/25/1991EP0447673A1 Process of enzymatic bleaching of pulp
09/24/1991US5051195 Filters
09/24/1991CA1289398C Dewatering press
09/24/1991CA1289306C Method for stabilizing the brightness of bleached lignin containing cellulose pulp
09/24/1991CA1289305C Production of high strength linerboard with oxygen and alkali
09/21/1991WO1991014823A1 Process for the enzymatic bleaching of celluloses
09/21/1991CA2078345A1 Process for enzymatic bleaching of celluloses
09/18/1991EP0296198B1 Method for washing of alcaline pulp
09/17/1991CA1288906C Pulp souring process enhancing conservation of specific bleaching agent residuals
09/11/1991EP0446110A1 Process for producing bleached high-yield pulps
09/11/1991EP0445144A1 Apparatus for continuous processing of pulp
09/10/1991US5046338 Multiphase pulp washer
09/04/1991EP0444985A1 Double diffuser with flexible bellows and internal actuator
09/04/1991EP0444335A1 Methods for producing bleached, mercerized and unmercerized cellulose and for producing cellulose triacetate therefrom
09/04/1991EP0305394B1 Arrangement for liquid treatment of pulp
09/04/1991EP0301024B1 Dewatering press
09/04/1991EP0301023B1 Apparatus for liquid treatment of pulp
09/03/1991US5044179 Stabilizing pressure and flow conditions in a screening apparatus
08/1991
08/29/1991DE4105873A1 Regeneration of secondary cellulose fibres - by adding disinfectant to the suspension for absorbent medical and sanitary applications
08/27/1991CA2036694A1 Double diffuser with flexible bellows and internal actuator
08/22/1991WO1991012366A1 Bleaching of paper pulp
08/22/1991WO1991012065A1 Apparatus for filtering liquids
08/22/1991CA2069883A1 Apparatus for filtering liquids
08/21/1991EP0442425A1 Process for the chlorine-free bleaching and delignification of pulp
08/21/1991CN1013595B Method and apparatus for controlling consistency of pulp suspension
08/20/1991CA1287705C Process for preparing pulp for paper making
08/17/1991WO1991012369A1 Bleaching of lignocellulosic material with dioxiranes
08/17/1991WO1991012066A1 Apparatus for filtering liquids
08/17/1991WO1991012064A1 Apparatus for filtering liquids
08/17/1991WO1991012063A1 An apparatus for filtering suspensions and a method of operating the apparatus
08/17/1991CA2069882A1 Apparatus for filtering liquids
08/14/1991WO1991012367A1 Ctmp-process
08/14/1991EP0441113A1 Process for the chlorine-free bleaching of cellulosic pulp
08/14/1991DE4004364A1 Bleaching and delignifying pre-balanced cellulose - in two stages with peroxide activated with cyanamide or cyanamide salt, avoiding agents contg. chlorine
08/13/1991US5039412 Wire with guide belts for a pulp thickener
08/13/1991US5039377 Controlling ph with alkali metal carbonates or bicarbonates instead of hydroxides; brightness, stability, discoloration inhibition
08/13/1991US5039320 Apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material
08/13/1991CA1287572C Antimicrobial composition containing isothiazolone
08/13/1991CA1287451C Method for reducing contamination in pulp processing
08/07/1991EP0440472A1 High bulking resilient fibers through cross linking of wood pulp fibers with polycarboxylic acids
08/07/1991CN2082280U High efficient sealing type pressurized washing device
08/03/1991WO1991011553A1 A process for the bleaching of chemical pulp
08/03/1991CA2075187A1 Process for the bleaching of chemical pulp
08/02/1991CA2035402A1 High bulking resilient fibers through crosslinking of wood pulp fibers with polycarboxylic acids
08/01/1991WO1991011554A1 Process for bleaching of ligno-cellulosic material
07/1991
07/30/1991US5035772 Chemically and blocking phenolic hydroxyl groups
07/25/1991WO1991010724A1 Preparation exhibiting enzymatic delignification activity, a method of producing the same, and applications thereof
07/24/1991EP0438092A1 An apparatus for thickening fibre suspension
07/23/1991US5034128 Apparatus for dewatering pulp
07/23/1991US5034096 Peroxide, oxide and/or oxygen as a bleaches, also cyanamide
07/23/1991US5034095 Feeding cellulose containing alkali and oxygen, slurrying, discharging
07/23/1991CA1286454C Method for washing of alkaline pulp
07/18/1991CA2033920A1 Apparatus for thickening fibre suspension
07/17/1991CN1053011A Absorbent structure containing individualized, polycarboxylic acid crosslinked fibers
07/16/1991WO1991010774A1 Environmental pulp, method for its manufacture and use of pulp
07/16/1991CA2072585A1 Environmental pulp, method for its manufacture and use of pulp
07/12/1991CA2033855A1 Process for countercurrent washing and bleaching of a pulp from chemical pulping
07/11/1991CA2073436A1 Preparation exhibiting enzymatic delignification activity, a method of producing the same, and applications thereof
07/10/1991CN1052875A Individualized, polycarboxylic crosslinked fibers
07/10/1991CN1013131B Method of manufcturing paper pulp
07/10/1991CN1013130B Method for producing double gummed paper with full-reed pulp
07/09/1991US5030324 By-product inhibition
07/04/1991DE4039294A1 Bleaching cellulose fibre pulp - using chlorine di:oxide then with ozone without intermediate washing
07/04/1991DE4039099A1 Cellulose fibre pulp is bleached - with chlorine di:oxide and ozone in any desired sequence without intermediate washing
07/03/1991EP0434696A1 Method of making chemi-mechanical pulp from hardwood
07/02/1991US5028299 Installation for the continuous-flow production of stabilized chips or particles derived from wood waste
07/02/1991US5027620 Diffuser with flexible bellows and internal actuator
07/02/1991CA1285353C Process for the preparation of sulphide-free alkali liquor
06/1991
06/27/1991WO1991009043A1 Process for continuously bleaching liquids with ozone
06/26/1991EP0434662A1 Process for bleaching cellulosic materials and plant for carrying out the process
06/19/1991EP0433258A1 Procedure for the production of pulp
06/19/1991EP0433138A1 Process for bleaching chemical cellulose pulps
06/19/1991EP0432178A1 Pulp wash press
06/19/1991CN1052344A Process for preparing individualized, polycarboxylic acid crosslinked fibers
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