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JP4704639B2 |
A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, whi...
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JP4704638B2 |
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JP4695545B2 |
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JP4681893B2 |
A procedure for the continuous cooking of chemical pulp, comprising an impregnation vessel 101 and a digester 102. The chips are impregnated in the impregnation vessel 101 and are fed after impregnation together with circulation fluid th...
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JP4663816B2 |
To provide a technique for improving the causticizing process in pulp production. In the causticizing process of pulp production, improvement of lime sludge dewaterability, decrease of dreg generation and, moreover, high whitening of cal...
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JP4663815B1 |
To provide a technique for improving the causticization step in pulp production.A method for producing a causticized precipitated calcium carbonate is provided, comprising the following way: in the causticization step in a pulp productio...
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JP2011047057A |
To promote the action of a chemical for papermaking on a chip by allowing the chemical for the papermaking to penetrate into the inside of the chip.The chemical-containing chip for the papermaking is produced by (A) freezing a chip, (B) ...
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JP4644363B2 |
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JP4629164B2 |
In a cooking process of a lignocellulose material, pulp yield can be improved at the same Kappa number and an effective alkali addition rate can be reduced at the same Kappa number. In a continuous cooking process making use of a digeste...
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JP2011001677A |
To provide a pulp production apparatus capable of producing the pulp from a raw material in a high concentration pulper, or the like and to provide the pulp production apparatus capable of producing the pulp using a palmae plant as the r...
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JP4604136B1 |
An apparatus and process for pulp production are provided with which a pulp can be produced in an environment having the atmospheric pressure and having a temperature lower than in the kraft process and the sulfite process. The apparatus...
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JP4586066B2 |
Disclosed is a process for producing pulp utilizing bamboo, comprising finely cutting the bamboo into short segments and subjecting the cut bamboo to screening and washing processes to thereby produce dissolving pulp capable of achieving...
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JP2010255171A |
To provide a lignocellulosic material treating process settling the conventional defects.There is provided a continuous process for producing a chemical grade pulp, which process includes the steps of: (a) steaming lignocellulosic materi...
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JP2010229602A |
To provide a simple method of efficiently producing a sulfide salt such as sodium sulfide and sodium disulfide in an alkali solution in an alkali recovery process in the production of pulp.A sulfide salt such as sodium sulfide and sodium...
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JP4538235B2 |
The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking...
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JP4505229B2 |
A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel ( 1 ) for impregnation and a vessel ( 2 ) for cooking the impregnated cellulose chips. A part of th...
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JP4502507B2 |
A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide i...
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JP4502508B2 |
A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and bleaching of wood and non-wood cellulose fib...
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JP2010144273A |
To provide a method for producing a chemical pulp which can be formed into a closed system by simplifying chemicals used in a cooking step and a bleaching step, uniting waste liquids and wastewater in the cooking step and the bleaching s...
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JP2010144289A |
To provide a method for steam-digesting a conifer lignocellulose material, improving the steam digestion yield and steam digestibility of the conifer lignocellulose material by using a continuous steam-digesting pot. This method for cont...
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JP4488788B2 |
A method for converting a vapor phase continuous digester to a hydraulic digester including the steps of: operating the vapor phase digester in a vapor phase mode wherein a chip slurry enters the vessel of the digester through a lower ch...
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JP4486111B2 |
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JP2010116646A |
To provide a method for producing coated printing paper having excellent whiteness, smoothness, and printing smoothness at a low cost.The method for producing the coated printing paper having one or more coating layers containing a pigme...
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JP2010514946A |
The invention relates to a process for producing a tissue web, which is produced from a stock suspension including fibers. In this case, the volume and the tearing length are to be improved with the lowest possible freeness by the stock ...
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JP2010095816A |
To efficiently carrying out cooking in the production of a chemical pulp by managing the proportion of a lignin structure in a lignocellulose material of a raw material.The method for managing the mixing of the raw materials of the chemi...
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JP4454822B2 |
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JP2010059565A |
To provide high yield pulp for printing paper from a plant raw material containing a large amount of pith, which has a non-wood plant raw material such as bagasse consists of 2/3 amount of rind (pelt) and 1/3 amount of the pith (medulla)...
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JP4385766B2 |
Treating woodchips comprising: (a) production of DNA encoding a specific antisense RNA; (b) constructing a vector; (c) effecting transcription by using the vector and preparing host cells with suppressed cellulose-digesting enzyme activi...
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JP2009540134A |
A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as Na2SO3), based on the oven-dry amount of the lignocellulosic raw material; mi...
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JP2009540132A |
A method for producing fibrous material from softwood, hardwood, or annual plants, including preparing a solution of chemicals having one of: more than 5% of chemicals for softwood, more than 3.5% of chemicals for hardwood, or more than ...
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JP4366959B2 |
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JP4366960B2 |
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JP4365219B2 |
Enzyme-treated papermaking sludges are provided, as are methods of making the enzyme-treated sludge. Papermaking processes that incorporate the enzyme-treated papermaking sludges into papermaking pulp are also provided as are paper and p...
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JP4362445B2 |
The digester and method are for the continuous cooking of pulp. At least two withdrawal positions ( 11 E, 11 D) for cooking fluid are arranged at different heights in the digester ( 10 ). The cooking fluid in the first and second positio...
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JP4362364B2 |
The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a mixture thereof in an aqueous solution at a...
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JP4336562B2 |
To provide bamboo pulp having high antibacterial properties and provide various kinds of antibacterial cellulose fiber from the bamboo pulp and provide a variety of clothes having high antibacterial properties. The bamboo pulp is produce...
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JP4330074B2 |
A method for feeding a cellulosic fibrous material to a high pressure processing vessel including: pressurizing a low pressure flow of the fibrous material in a high pressure transfer device; discharging a high pressure flow of the fibro...
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JP4317691B2 |
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester,...
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JP2009167542A |
To provide a method for treating lignin or a vegetable fiber comprising the lignin by repeatedly using manganese peroxidase, efficiently affording trivalent manganese in stable yield, and using the resultant trivalent manganese, and to p...
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JP4298059B2 |
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JP4298058B2 |
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JP4292082B2 |
The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregna...
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JP4292148B2 |
Chips which have not been based in steam are continuously added to and removed from an impregnation vessel (30) containing impregnation liquid zones (Z1-Z3) with different temperatures. The flow of impregnation liquid (BL1) in the upper ...
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JP4283981B2 |
Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such ...
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JP4284382B2 |
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JP4280636B2 |
The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done while the chips are first treated in a ...
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JP4275936B2 |
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JP4272514B2 |
The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applyin...
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JP4273772B2 |
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JP2009516086A |
The invention relates to a new pulp, which is derived from lignocellulosic material subjected to agitation in an aqueous tetra-alkylammonium salt solution under microwave irradiation. The invention relates also to a process for pulping l...
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