Class / Patent application number | Description | Number of patent applications / Date published |
162055000 | With classifying, separating or screening of pulp (solids from solids) | 16 |
20080308239 | FIBER BLEND HAVING HIGH YIELD AND ENHANCED PULP PERFORMANCE AND METHOD FOR MAKING SAME - The present disclosure relates to producing paper or paperboard having improved stiffness and strength, compared to the conventional paperboard at the same basis weight. It also discloses a method of wood pulping having a significantly increased yield and providing fiber pulps with enhanced properties such as strength and stiffness. Wood chips are chemically pulped to a high kappa number, providing a rejects component and an accepts component. The rejects component is subjected to a substantially mechanical pulping process, optionally in a presence of bleaching agent, prior to blending back into the accepts component. The resulting fiber blend is washed, optionally bleached, and subjected to a papermaking process to provide paper or paperboard with enhanced strength and stiffness at low basis weight. | 12-18-2008 |
20090032207 | Process for Producing Mechanical Pulp Suitable for Paper or Cardboard Making - Method for the production of mechanical or chemi-mechanical pulp as raw material for paper or cardboard. According to this method, the pulp is fibrillated and the fibrillated pulp is bleached in alkaline conditions. According to the present invention, the pulp is screened to separate the reject from the accept, at maximum approximately 60% of the total amount of pulp is separated as the reject, the reject is bleached separate from the accept, and, after that, the bleached reject is remixed with the accept. When operating according to the present invention, the strength of the pulp increases and the energy used for refining is reduced, which is seen both in the refining of the reject and in the post-refining of the final mechanical pulp. | 02-05-2009 |
20090188635 | METHOD AND APPARATUS FOR TREATING PULP - A method of dividing a suspension, especially a fiber suspension into an accept fraction and a fraction containing impurity particles in a centrifugal cleaning plant having at least two stages. The suspension is fed to a preceding stage, wherefrom a heavier fraction of the suspension is taken as accept fraction and a lighter fraction is taken as fraction containing impurity particles. The lighter fraction containing impurity particles is fed into a latter stage of the centrifugal cleaning plant. Before being fed to the latter stage, the feed consistency of the lighter fraction is increased. | 07-30-2009 |
20090272504 | Method and apparatus for the integrated cleaning of a paper-pulp processing plant - A method for the integrated cleaning of a paper-pulp processing plant including one or more high density cleaners comprising the steps of supplying the rejected flow ( | 11-05-2009 |
20090308550 | Pin chip recovery - A method is described for separating pin chips from a wood furnish of wood chips, pin chips and fines mixture. In the method, the wood chips are separated from the pin chip and fines mixture and treated with a surfactant to lower the interfacial surface tension between the pin chip and the fibers. The resulting treated pin chip and fines mixture is then mechanically separated into the individual pin chip and fines fraction. | 12-17-2009 |
20100175840 | HIGH YIELD AND ENHANCED PERFORMANCE FIBER - A method of wood pulping having a significantly increased yield is disclosed. Wood chips are chemically pulped to a high kappa number, providing a first accepts component and a first rejects component. The first rejects component is subjected to a high consistency pulping process such as a substantially mechanical pulping process to generate a second accepts component and a second rejects component. The first accepts component may be used in the production of saturating kraft paper with excellent saturability and resin pick up. The second accepts may be used as a second fiber source in the production of multiply linerboard and unbleached paperboard with enhanced stiffness, strength, and smoothness. Alternatively, the first accepts component may be blended with the second accepts component to produce fiber blends, which may be used in a production of paper-based products having enhanced strength and stiffness at low basis weight. | 07-15-2010 |
20100252214 | Method and a Device for the Dewatering of a Fibre Suspension Supplied by a Nozzle Assembly - A vertically elongate and oriented container ( | 10-07-2010 |
20100269991 | DEFLAKER PLATE AND METHODS RELATING THERETO - A deflaker plate for use in a deflaker for reducing fibrous flakes in a slurry of fibers. The deflaker plate may include at least one annular ring consisting of multiple teeth, in which at least one tooth has a leading face, a trailing face, and an impact-generating side-face. The impact-generating side-face may be adapted to generate an impact force during operation, such that the force corresponds to a first vector radially pushing the slurry towards a center of the deflaker and a second vector tangentially pushing the slurry towards the leading face. | 10-28-2010 |
20100276093 | PROCESS FOR FRACTIONATING SUGARCANE BAGASSE INTO HIGH A-CELLULOSE PULP, XYLAN AND LIGNIN - Sugarcane bagasse consists of mainly three polymeric components, namely cellulose (40-45%), hemicellulose (xylan) (28-30%), and lignin (19-21%). A process is herein disclosed for fractionating sugarcane bagasse into cellulose, hemicellulose and lignin with high purity α-cellulose, which is a useful raw material for preparing cellulose esters like cellulose triacetate and other high value-added cellulose plastics. Co-production and recovery of hemicellulose (xylan) and lignin in high yields and high purities, along with α-cellulose, is another important feature of this process. Sugarcane bagasse consists of a material known as pith which constitutes 30-35% by weight of bagasse. Pith contains cellulose, hemicellulose, and lignin, in addition to various other ingredients and cell mass. The process described herein discloses the use of partially depithed bagasse as a preferred raw material for fractionation. Use of sugarcane bagasse containing pith leads to a product which is lower in yield as well as poorer in color. | 11-04-2010 |
20110056635 | FIBERBOARDS, USES AND METHODS OF PREPARATION THEREOF - There is provided a fiberboard, such as a MDF fiberboard or a HDF fiberboard, comprising wood fibers, a binder, and a sludge such as a pulp and a paper sludge. The sludge can be, for example, chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, a de-inking sludge, and mixtures thereof. | 03-10-2011 |
20110120663 | METHOD AND SYSTEM FOR THIN CHIP DIGESTER COOKING - A method to cook thin chips in a continuous digester vessel including: introducing thin chips having a thickness of no more than 6 mm, into a chip bin; adding white (cooking) liquor to the chip bin or to a chip transport passage extending from the chip bin to an upper inlet of the continuous digester vessel; injecting medium pressure steam or another heated fluid to an upper region of the digester vessel to elevate a cooking temperature of the chips in the vessel to at least 130 degrees Celsius; cooking the chips in the vessel as the chips flow downward through the vessel without substantial extraction or introduction of liquor in the cooking section of the vessel; injecting wash liquid to a lower region of the vessel; extracting at least wash liquid through a wash liquid extraction screen in the lower region of the vessel and above the injection of the wash liquid, and discharging the cooked thin chips from the lower region of the vessel. | 05-26-2011 |
20110155335 | USE OF POLYSULFIDE IN MODIFIED COOKING - A method for Kraft pulping employing a modified cooking process in conjunction with polysulfide pulping technologies to obtain higher pulping yields than obtained in the prior art. The total required alkali charge (polysulfide liquor) is added to the beginning of a cook, and after all polysulfide has essentially reacted with lignocellulosic material at temperature below that at which no significant carbohydrate degradation occurs, a first quantity of the cooking liquor high in effective alkali (EA) concentration is removed from a first point in the pulping process and replaced with a cooking liquor low in EA concentration removed from another process point. The first quantity is then added elsewhere in the pulping process, where the EA concentration is low. This cooking liquor “exchange” obtains the full yield benefit from polysulfide pulping and a more uniform EA concentration profile to retain the major benefits of modified cooking. | 06-30-2011 |
20110253326 | Separation of Lignin From Lignocellulosic Materials - A method is described for separating lignin from liquid solutions resulting from the pretreatment of lignocellulosic materials such as switchgrass with ammonium hydroxide. The method involves a sequence of steps including acidification, evaporation, and precipitation or centrifugation that are performed under defined conditions, and results in a relatively pure, solid lignin product. The method is tested on ammonium hydroxide solutions containing lignin extracted from switchgrass. Experimental results show that the method is capable of recovering between 66-95% of dissolved lignin as a precipitated solid. | 10-20-2011 |
20120000619 | ARRANGEMENT, SYSTEM AND METHOD FOR TREATMENT OF CELLULOSE PULP - Apparatus for screening cellulose pulp streams is disclosed including first and second screens contained in a housing, and a primary inlet for directing the cellulose pulp stream into the housing, an accept outlet for withdrawing an accept portion from the housing, a reject outlet for withdrawing a reject portion from the housing, a first accept chamber for receiving the accept portion which has passed through the first screen, a second screen chamber for directing the first accept portion to the second screen, and a secondary pulp inlet for receiving a second cellulose pulp feed stream comprising a screened cellulose pulp accept fraction and directing it to the second screen whereby the second accept fraction is delivered to the accept outlet. Methods and systems for screening cellulose pulp systems are also disclosed. | 01-05-2012 |
20120193049 | METHOD FOR PROCESSING LIGNOCELLULOSE MATERIAL - A method for processing a lignocellulose material, comprises the following steps: (1) crushing and sieving the lignocellulose material, and collecting granules with a particle size of between 0.08 and 0.1 mm; (2) mixing the granules obtained in step (1) with water, and dispersing through a colloid mill to yield a suspension with a particle size of 40-80 μm; (3) homogenizing the suspension obtained in the step (2) under high pressure to have a particle size of between 10 and 40 μm; and (4) buffering the suspension obtained in the step (3) with a buffer solution of sodium acetate and acetic-acid, adding cellulase, β-glucosidase, and xylanase, and performing zymolysis for 36-72 hours. | 08-02-2012 |
20150107789 | DISSOLVING PULP AND A METHOD FOR PRODUCTION THEREOF - A method of preparing dissolving pulp. The method includes physically separating a kraft pulp or a kraft hydrolysis pulp into first and second fractions, the first fraction having a relatively low lignin content and the second fraction having a relatively high lignin content. | 04-23-2015 |