Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 351 - 400 out of 689

Document Document Title
WO/1997/003244A1
A method for cooking chips which are impregnated, in a vessel (3), with liquid in first and second concurrent impregnation zones (A, B), impregnation liquid being supplied, in a mixture with steamed chips, through a feeding system to the...  
WO/1997/003243A1
Method of cooking chips, which are impregnated with liquid in a vessel (3) in a cocurrent impregnation zone (A) and a subsequent countercurrent impregnation zone (B), whereby impregnation liquid is supplied in a mixture together with ste...  
WO/1996/041914A1
A method for refining lignocellulose-containing material into pulp in a primary refiner, preferably a disc refiner (32). The material is preheated (20, 22, 24) to a temperature greater than the glass transition temperature of the lignin ...  
WO/1996/041894A1
A bubble-actuated pump (22) is used for removing dross (21) from the surface of a bath of molten metal (14). A modification of the pump (24) is employed for delivering molten metal to the dross (21) for diluting it.  
WO/1996/034143A1
The present invention relates to a method for continuous cooking of kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips being conveyed from a high-pressure feeder (2) in a transfer line (2A...  
WO/1996/033309A1
A method for making lignocellulose fibers, which may be optionally coated with a suitable thermoplastic, wherein the starting materials may be chosen from a wide variety of generally non-recyclable contaminated wood, paper, and/or plasti...  
WO/1996/009432A1
A method and apparatus for the continuous production of cellulosic pulp for use in a papermaking process. The apparatus includes a vessel (1) containing a pulping liquor and the vessel consists of a first impregnation zone (2) and a seco...  
WO/1996/006974A1
The present inventon relates to a sulphite fusion process for the production of celluloses using alkaline monosulphite solutions, organic solvents and quinone derivatives. The raw material to be fused is treated in a special impregnation...  
WO/1996/005362A1
A method of making a wood pulp is disclosed. The method includes chipping wood into wood chips and then inoculating the wood chips with an inoculum of Ceriporiopsis subvermispora and a nutrient adjuvant selected from the group consisting...  
WO/1995/034712A1
A chip feeding system for a continuous digester provides for a greater rate of delivery of chip slurry to the digester, and is much less expensive than conventional chip feeding systems, typically being only 40-50 % of the height of the ...  
WO/1995/032331A1
Method of stepwise delignification of lignocellulose fiber material by digestion with sulphidic alkaline liquor comprising kraft cooking of wood chips with white liquor. White liquor is distributed during digestion. Ex-digestion liquor i...  
WO/1995/023891A1
A method for improving pulp brightness utilizes a combination of a distributed total white liquor charge during the warm fill, hot fill and cooking stages of a batch cooking process and low cooking temperatures during the cooking stage. ...  
WO/1995/021961A1
The present invention relates to a method for optimizing the liquor-to-wood ratio, especially in a pre-impregnation vessel and a continuous digester, when producing chemical pulp. The method is based on a transfer circulation with the ai...  
WO/1995/020065A1
Process for preparing pulp from ligning-containing cellulosic material are disclosed including a prehydrolysis step followed by neutralizing hydrolysate and the prehydrolyzed cellulosic material in the reactor with alkaline neutralizing ...  
WO/1995/009267A1
The application presents a method of treating chips with a chemical solution. In the method air is removed from the chips by using a vacuum, the vacuum-treated chips are put under a chemical solution pressure of no less than about 1 atm ...  
WO/1995/008648A1
The invention relates to the prehydrolysis of lignocellulose by passing an acidic or alkaline solution through solid lignocellulosic particles with removal of soluble components as they are formed. The technique permits a less severe com...  
WO/1995/002726A1
A method of manufacturing chemical pulp out of comminuted cellulosic fibre material comprising digesting the fibre material with digestion liquid without preceding peroxide stage. According to the invention the comminuted fibre material ...  
WO/1994/026878A1
Plant cell expansion is regulated by wall relaxation and yielding, which is thought to be catalyzed by elusive "wall loosening" enzymes. By employing a reconstitution approach, we initially found that a crude protein extract from the cel...  
WO/1994/021854A1
The fungi Schizophyllum commune, Trichaptum biforme and Phanerochaete gigantea are useful in reducing the pitch content of pulps and pulpwoods used in making cellulosic products.  
WO/1994/020670A1
A process is disclosed for producing chemomechanical and/or chemothermomechanical wood products from lignocellulosic raw materials, such as wood chips. The raw materials are impregnated with a SO2-containing solution and then subjected t...  
WO/1994/018383A1
The present invention relates to a method of producing chemi-mechanical pulp, comprising grinding wood in a grinding mill housed in a grinding chamber, maintaining the chamber at an overpressure and spraying water onto the wood. The inve...  
WO/1994/012719A1
A process is disclosed for producing viscose from lignocelluloses such as those of deciduous trees, coniferous trees or annual plants. The lignocellulose is first processed in a digester with saturated steam to cause the preliminary hydr...  
WO/1994/009057A1
Reaction of Lignocellulosic material with Acetic Anhydride vapour greatly improves dimensional stability and resistance to biological attack and is according to this, invention made in the absence of any co-solvent or added catalyst in a...  
WO/1993/004232A1
A process for the continuous digestion of cellulosic fiber material, comprising impregnation with impregnating liquid consisting of at least one fresh digesting liquor, in a closed impregnating system and subsequent digestion with digest...  
WO/1992/013997A1
A self-loading, controlled deflection roll (10) for forming a pressure nip (N) with another roll (34) has at least one support shoe (24, 26), and preferably two opposed support shoes, mounted in a stationary support shaft (16) for contro...  
WO/1992/011409A1
A system is provided for feeding wood or annual plant chips to continuous digesters for producing paper pulp. The system comprises two stages: in a first, impregnation stage, the chips are impregnated with a sufficient amount of chemical...  
WO/1991/012368A1
Processes for preparing kraft pulp are disclosed. The processes include pretreating cellulosic material or chips with spent cooking liquor at the temperature of about 20 to 100 �C, followed by heating the impregnated chips at the tempe...  
WO/1991/008058A1
A disk screen or like shaft structure is disclosed in which screen disks (14), surround disks (24), and spacers (28) are connected together in modular relation. The surround disks (24) have metallic flanges (25) which shield the plastic ...  
WO/1991/006700A1
Mechanical and chemimechanical cellulose pulp, particularly paper pulp, is produced at a low energy input by disintegrating and beating wood material in one or more stages. Acccording to the invention, a substance capable of forming comp...  
WO/1991/006380A1
A wood particle screen (10) particularly useful for separating fines from wood chips in which a bed of flexible foraminous material (50) having holes therein sized to permit fines to pass therethrough is flexibly mounted for receiving a ...  
WO/1991/005102A1
In a process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alco...  
WO/1991/003595A1
For the purpose of facilitating the impregnation of wood chips, the chips are compressed between two compression devices (9) which act on the mutually opposing flat sides of the chips (2). As the chips are compressed, the chips (2) are u...  
WO/1990/011836A1
A device for separating fibres and gas, comprising a cyclone (1) with inlet (2) for a mixture of fibre/gas and separate outlets (3 and 5, respectively) for fibres and gas, respectively. In front of the gas outlet (5) a screen (6, 10) is ...  
WO/1990/008221A1
The present invention solves the problem of delignifying technical cellulose pulp in a selective manner which will result in very low residual contents of lignin in the pulp and a correspondingly high quantity of lignin dissolved in spen...  
WO/1990/006394A1
A chips washing device comprising a cylindric tank (1) provided upwardly with inlet for chips and water directly in front of a chute (2), which extends in screw-shape downward at least half a turn along the inside of the tank (1). The ch...  
WO/1990/004672A1
An apparatus for improving the pulping characteristics of wood chips in which a pair of closely operating rolls (40, 42 or 50, 52) are provided for supplying compressive force to chips passed therebetween, at least one roll having an agg...  
WO/1990/002835A1
Manufacture of chemi-mechanical pulp from hardwood intended for wood-containing printing paper, especially wood-containing fine paper. The wood material in the form of chips is impregnated in one or two steps at a temperature below 80�...  
WO/1989/008165A1
In view of the environment requirements of today it is essential to be able to delignify cellulose pulp to a low kappa number prior to the bleaching of the pulp. According to the invention, this is achieved in that the wood raw material ...  
WO/1989/007170A1
The invention concerns a process and an equipment for pretreatment of cellulosic chip-formed raw material by impregnation. In the process, first a vacuum treatment is carried out without preceding moistening treatment, and as soon as pos...  
WO/1989/006293A1
A method of crushing a fibrous material consists in repeatedly squeezing the material while passing it between the working surfaces (3, 4) of two crushing elements (1, 2) respectively, each of the crushing elements (1, 2) being made to o...  
WO/1989/004394A1
In a method of producing high-yield pulp from pulp chip material containing lignocellulose the material is treated with steam in a steam treating station (1) for driving air out of the material and heating the latter. Heat treated materi...  
WO/1989/002951A1
Lignocellulose material in the form of pieces with a length in the fibre direction of at least 100 mm is compressed perpendicularly to the fibre direction of the material to such a degree, that its pores substantially are compressed. The...  
WO/1988/007988A1
Disclosed are tetraphenyl porphyrins which are beta-substituted by fluoro or chloro and/or bear electronegative substituents on the phenyl including one or two water solubilizing substituents. The new porphorins are particularly suitable...  
WO/1985/002423A1
Method for the production of cellulose by the batch cooking process, wherein the digester is filled with chips and cooking liquor, and the batch is cooked at elevated temperature and pressure in order to obtain a delignified cellulose pu...  
WO/1983/001469A1
Preparation of polysulphide for treatment of wood chips so that the wood consumption is reduced in kraft digestion of paper pulp. In an impregnation stage the wood chips are caused to react with black liquor, or black liquor components c...  
WO/1983/000816A1
Process and apparatus for mixing a wood pulp slurry with a chemical at the consistency at which the slurry exits a washer or the subsequent stem mixer, 7 to 15%. The chemicals would include non-condensable or unsaturated gases such as ox...  
WO/1982/004271A1
A fibrous material, in particular a cellulose material, is subjected to heating and subsequent treatment at high pressure, in particular with application of an impregnation agent after the heating and before the high pressure treatment. ...  
WO/1982/000838A1
When manufacturing cellulose pulps from lignocellulosic material in the form of wood chips, the chips are normally steamed, optionally subsequent to being subjected to an introductory washing stage so as to obtain a homogenous moisture c...  
WO/1979/000375A1
A bulk material is treated in a drum rotating in a bulk of the bulk material to be treated. The drum (16, 68) is provided with feeding-in openings (28, 70) in the cylindrical face of the drum. The bulk material tumbles around in the drum...  
JP2022504216A
The present invention relates to a method of supplying a slurry of chips and a liquid to a prehydrolysis reactor in the production of dissolving pulp. The slurry is pumped into the reactor by using at least one pump and alkali is supplie...  

Matches 351 - 400 out of 689