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4357208 |
Method of making pulp
Lignocellulose material is pretreated with steam, heat, lignin softening chemicals or combinations thereof. The pretreated material is then refined in a disc refiner. Water is added to the material...
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4347101 |
Process for producing newsprint
A high quality newsprint pulp can be produced from wood or vegetable fibers by thermomechanically pulping one portion of these fibers and thermochemically pulping the remaining portion. After...
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4294653 |
Process for manufacturing chemimechanical cellulose pulp in a high yield within the range from 65 to 95%
A process is provided for the manufacture of bleached chemimechanical cellulose pulp in high yield of between 65 and 95% from particulate and preferably washed lignocellulosic material, such as...
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4260452 |
Production of paper pulp from sugar mill bagasse
Paper pulp is produced by a process in which raw sugar mill bagasse is moist depithed, wet bulk stored in the presence of an inorganic and organic preservative, wet depithed by hydraulic shearing...
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4248662 |
Oxygen pulping with recycled liquor
Fibrous material is pre-steamed, impregnated with alkali liquor, refined, and then oxygen pulped at a low consistency (about 3 to 8 percent solids) using an alkali liquor which contains boron...
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4230524 |
Method for the production of unbleached sulphite cellulose or bleached cellulose from a defibrated knot pulp
Knots separated from sulphite cellulose produced by a sulphite cellulose cooking process are converted to unbleached sulphite cellulose by first separating and defibrating the sulphite knots and...
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4220498 |
Oxygen reactor systems pulp reject treatment
A method and apparatus for the delignification of cellulosic fiber material to minimize the amount of reject material in the final pulp produced. The fiber material is digested, washed, oxygen...
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4160693 |
Process for the bleaching of cellulose pulp
A process is provided for the bleaching of cellulose pulp, particularly for the peroxide bleaching of high yield pulp, which comprises forming a suspension of lignocellulosic pulp material; mixing...
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4120747 |
Use of ozone treated chemithermomechanical pulp in a high bulk tissue papermaking process
Soft, absorbent, bulky paper web useful in tissue, towel, sanitary, and like products. The web is formed by supplying an aqueous furnish which includes thermomechanically defibrated pulp in...
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4091749 |
Alkaline pulping of lignocellulosic material with amine pretreatment
A lignocellulosic material, such as wood chips, is pretreated with an aqueous solution containing from 0.1 to 10% by weight of a water soluble lower aliphatic amine selected from monoethanolamine,...
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4045279 |
Process for the manufacture of pulp using sodium carbonate and oxygen
A process for preparing pulp in a closed system by pre-cooking fibrous raw material in an alkaline aqueous solution of sodium carbonate or a mixture of sodium carbonate and sodium bicarbonate as...
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RE28777 |
Refining of vegetable matter and delignification of the refined matter with chlorine dioxide
A process for the delignification of chips of vegetable matter by pretreating the chips to obtain at least 64 percent by weight refined vegetable matter, and delignifying the refine vegetable...
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3919041 |
Multi-stage chlorine dioxide delignification of wood pulp
A process of producing papermaking pulp by partially digesting wood followed by mechanical refining and then delignifying with chlorine dioxide in three stages with caustic extraction between the...
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3873412 |
MECHANICALLY REFINING A MIXTURE OF KRAFT AND SEMICHEMICAL PULP
Method for producing pulp for use in the manufacture of kraft type products such as linerboard and bag grade paper comprising the steps of steaming small segments of fibrous material, defiberizing...
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3819470 |
MODIFIED CELLULOSIC FIBERS AND METHOD FOR PREPARATION THEREOF
Modified cellulosic fibers, characterized by improved properties, such as reduced swellability and reduced natural fiber-to-fiber bonding, are produced by a process which comprises treating an...
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3773610 |
PRESSURIZED SYSTEM FOR PULP REFINING INCLUDING PRESSURIZED DOUBLE DISK TREATMENT
A refining system for high consistency pulp wherein the raw fibrous materials are passed through a series of treatments under a steam pressurized atmosphere of 10 to 150 p.s.i.g. and a temperature...
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3773611 |
TWO-STAGE SODIUM SULFITE-OXYGEN PULPING
Subjecting solftwood chips to a mild digestion with sodium sulfite alone or sodium sulfite and a small amount of sulfur dioxide or mixtures of sodium sulfite with sodium carbonate, bicarbonate or...
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3652387 |
PROCESS FOR THE MANUFACTURE OF DISSOLVING-GRADE PULP
Vegetable matter is treated to produce a dissolving-grade pulp, including mechanical refining of the raw material followed by, first, a lignin reaction treatment with chlorine dioxide or chlorine...
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3652385 |
PROCESS FOR TREATING CELLULOSIC MATERIALS FROM WHICH METAL IONS HAVE BEEN REMOVED WITH ALKALI AND OXYGEN IN THE PRESENCE OF COMPLEX MAGNESIUM SALTS
Cellulosic materials from which metal ions have been removed by acids or complexing agents is delignified with alkali in the presence of oxygen, and particularly air, and in the presence of...
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3617432 |
DELIGNIFYING LIGNOCELLULOSE WITH AN INCOMPLETE SODA COOK FOLLOWED BY GASEOUS BLEACHING
A process is provided for the preparation of pulp from lignocellulosic material. It involves two essential steps, namely: firstly, carrying out a modified conventional soda-cooking step in which...
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3393121 |
Soda cook of acid sulfite knotter rejects
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3284283 |
Production of wood pulps including treatment of cellulosic fibers with bisulfite ion followed by alkali metal borohydride
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3055792 |
Bleaching cold caustic pump with so2
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2913362 |
Method of producing cellulosic pulp
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2904460 |
Continuous pulping process
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2882147 |
Semi-chemical pulping process
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2835574 |
Modified mechano-chemical pulping
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3650887 |
Title is not available
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3691008 |
Title is not available
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3707436 |
Title is not available
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3597310 |
Title is not available
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3704201 |
Title is not available
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