347results about "Pulp properties modification" patented technology

Disclosed are non-wood pulps having a fiber length greater than about 1.70 mm and a brightness of about 80% or greater. The relatively high degree of brightness is achieved without a loss fiber length or pulp yield. The high degree of brightness and relatively long fiber length makes the pulps well suited for the manufacture of wet-laid fibrous products, particularly wet-laid tissue products. The pulps may be prepared from plants of the family Asparagaceae by mechanical pulping and more preferably by a chemi-mechanical pulping using a sodium hydroxide alkaline peroxide solution where the primary pulp is cleaned to reduce debris prior to bleaching. Preferably the cleaned primary pulp has less than about 5% debris prior to bleaching.

Disclosed are methods for the direct production of short fibers using microdecortication processes and the production of densified particles and short fiber products, sourced from hemp or other bast plants, hemp fiber products, methods for the production of hemp fiber-reinforced polymeric materials, and the polymeric materials resulting therefrom. An embodiment of the method for the production of densified hemp fiber products involves microdecortication with the utilization of particle size reduction equipment to cut all or a portion of hemp stalk, bast fiber, and hurd to produce short fibers and particles. Some embodiments make use of microdecortication to cut whole hemp stalk directly into short hemp fiber. Equipment with cutting action may provide for more adequate control of fiber size and aspect ratio while using the whole hemp stalk to produce short fibers, as opposed to the production of short hemp fibers by cutting long hemp fibers originating from decortication.

The invention relates to a preparation method of high-substitution-degree cationic micro-nano cellulose and application of the high-substitution-degree cationic micro-nano cellulose to improvement of water filtering performance of paper. In the enzymolysis pretreatment process, beta-1, 4 glucosidic bonds among glucose molecules are cut off, and more reaction binding sites are created for cationization after cellulose in an amorphous region and a part of crystalline region is hydrolyzed, so that the use amount of chemical reagents can be effectively reduced, and the environmental pollution is reduced. The prepared high-substitution-degree cationic micro-nano cellulose (CMFC) has abundant positive charges, weakens the hydrogen-bond interaction of cellulose molecules, improves the content of nano-fibrillation, and effectively reduces the mechanical preparation energy consumption of the CMFC. CMFC pulp is added into paper pulp fibers, so that pores of the paper fibers are blocked, more filler is intercepted, and the filler is difficult to be completely brought into white water by water flow in the water filtering process, so that the retention rate is increased, and the water filtering performance is effectively improved.

The present technology relates to fluff pulp having improved odor control and methods of making such fluff pulp. A fluff pulp is provided that includes bleached kraft fibers and a copper ion content of from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fibers. The bleached kraft fibers include a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of greater than about 3.5 meq / 100 grams; an ISO brightness of at least 80; and a viscosity of from about 2 cps to about 9 cps.

A microfiber cellulose solid body of which productivity in kneading treatment has been improved, as well as a method for preparing the microfiber cellulose solid body is provided. The microfiber cellulose solid body is formed by compressing a mixture containing resin powder and microfiber cellulose having an average fiber width of 0.1 to 19 μm, wherein the microfiber cellulose solid body has a volume of 6 to 4000 mm3 and a bulk density of 0.3 to 1.0 g / cm3.

The present invention discloses aramid insulation paper, a preparation method, and applications, relating to the technical field of aramid paper. The present invention utilizes cellulose treated with a treatment agent A and aminosulfonic acid in combination with meta-aramid chopped fibers treated with the treatment agent A to produce aramid insulation paper with excellent mechanical properties and resistance to high-frequency partial discharge and high temperatures.

Natural bamboo is chemically treated to remove at least some lignin therefrom. As a result, the bamboo becomes more porous and less rigid, while otherwise retaining the aligned microstructure of bamboo fibers and constituent cellulose nanofibers. In some embodiments, the treated bamboo can then be pressed such that the lumina therein at least partially collapse, thereby improving the strength and toughness of the bamboo among other properties. In some embodiments, the treated bamboo can be infiltrated with a polymer or polymer precursor, and / or have non-native particles added to surfaces thereof to tailor properties of the resulting bamboo structure. By further modifying, manipulating, or machining the treated bamboo, it can be adapted to various applications.

The present disclosure provides cellulose based adsorbents and their use in removing impurities from liquids, including water. The celluloses are alkylamine functionalized celluloses which may be contacted with a liquid, including water, to remove impurities therefrom.

The present disclosure relates to a polymer complex. According to the present disclosure, there is provided a polymer complex capable of exhibiting excellent mechanical properties while being environmentally friendly by including cellulose fibers as a reinforcing material.

The invention relates to a preparation method of dissolving pulp with uniform cellulose polymerization degree distribution, and belongs to the technical field of dissolving pulp. The preparation method of the dissolving pulp comprises the following steps: (1) raw material pulp pretreatment and grading screening; (2) cold alkali swelling and pulsed electric field cooperative treatment; (3) selective enzymolysis treatment of a compound enzyme system of cleavage enzyme and excision enzyme; and (4) neutralizing and washing the slurry. Compared with the prior art, the preparation method of the dissolving pulp provided by the invention has the advantages that the centralization of a polymerization degree main distribution interval (such as 800-1000) is realized, the standard deviation is obviously reduced, and the cellulose polymerization degree distribution is narrower and more controllable. No organic solvent or strong oxidant is needed in the whole preparation process of the dissolving pulp, the alkali liquor can be recycled, the enzyme preparation can be repeatedly used, and good environment friendliness is achieved.

The present disclosure relates to methods of processing non-wood plant biomass to produce microfibrillated cellulose. The present disclosure also relates to microfibrillated cellulose produced by those methods, and their uses.

To provide natural wood material with improved strength and toughness.SOLUTION: Wood material is treated in a chemical process to partially remove lignin from cellulose-based natural wood material, in which cellulose nanofibers of cell walls are aligned. Then, the treated wood material is pressed in a direction intersecting a direction in which lumens extend, such that the lumens are destroyed and residual fluid in the wood material is removed.SELECTED DRAWING: Figure 4

A method of manufacturing an article at least partially made of cellulose fibers comprises inserting a cellulose pulp comprising cellulose fibers and water into a mixing cavity; applying a high shear mixing action to the cellulose pulp using a high-shear mixer, such that a foam blend comprising cellulose fibers, water and air bubbles is created; inserting the foam blend into a mold cavity; and molding the article by heating the foam blend contained within the mold cavity.

To provide a method for producing carbamate cellulose fibers capable of mass-production.SOLUTION: In producing carbamate cellulose fibers, a pulp sheet containing urea is heated by passing it between a pair of rolls at a speed of 300 to 3000 m / min, and this heating causes denaturation, and multiple sets of the pair of rolls are continuous. A preceding set or sets are a drying part, the following set or sets are a reaction part, and the temperature of the rolls belonging to the drying part is 80 to 130°C, and the temperature of the rolls belonging to the reaction part is 220°C or higher. A method for producing carbamate cellulose fibers, which is characterized in that the number of pairs of rolls is such that the passing time of the drying part is 8 seconds or more and the passing time of the reaction part is 8 seconds or more.SELECTED DRAWING: Figure 1

A method for preparing a thermoplastic composition comprising grafted cellulose and optionally grafted hemicellulose is disclosed. The method includes providing a composition comprising cellulose and optionally hemicellulose, dissolving the cellulose and optionally hemicellulose of the composition at least partially, thereby obtaining a solution comprising solubilized cellulose and optionally solubilized hemicellulose, extruding the cellulose and optionally hemicellulose into a shape, such as a filament, a bead, a 3D object, or a molded article, and treating the shape with cyclic ester monomer, such that the cyclic ester monomer reacts with the cellulose and optionally hemicellulose contained in the shape, thereby at least partially grafting the cellulose and optionally hemicellulose with the cyclic ester monomer, thereby obtaining a thermoplastic composition.

This disclosure provides a foam comprising at least one structuring component selected from lignin, cellulose fibres (CF), cellulose microfibrils (CMF), and cellulose nanofibrils (CNF), polyelectrolyte, multivalent ions, and closed pores comprising gas, wherein at least some of the polyelectrolytes are present in non-covalent complexes with the multivalent ions, providing a network structure in the foam. There is also provided several manufacturing methods for manufacturing such foams.

Provided are compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

To provide efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials.SOLUTION: The invention is related to compositions and processes concerning (i) recovery of organic acids from a cellulosic pulp derived from organic acid pretreatment of plant materials, (ii) treatment of cellulose recovered from the cellulosic pulp derived from the organic acid pretreatment of the plant materials prior to conversion to glucose, (iii) separating and cleaning lignin from a lignin suspension derived from the organic acid pretreatment of the plant materials, (iv) recovery of organic acids from an aqueous phase of the organic acid pretreatment of the plant materials, (v) recovery of residual organic acids from hemicellulose-containing fractions derived from the organic acid pretreatment of the plant materials, and (vi) an organic fertilizer produced from cellulose and hemicellulosic juice derived from the organic acid pretreatment of the plant materials.SELECTED DRAWING: None

The present invention relates to a preparation method for a bamboo fiber for filter paper, filter paper containing the bamboo fiber, and a preparation method for the filter paper. The preparation method for a bamboo fiber for filter paper of the present invention comprises the following steps: (1) material selection: selecting bamboo; (2) chemical treatment: using a chemical agent to perform chemical treatment on the bamboo selected in step (1); (3) defibering: defibering the material obtained by means of the chemical treatment in step (2), to obtain coarse pulp; and (4) screening: screening the coarse pulp obtained in step (3) to obtain the bamboo fiber. The bamboo fiber prepared in the present invention has the mechanical property of a high elastic modulus, and the air filter paper manufactured using the bamboo fiber has the properties of high air permeability, high stiffness and high bulk.

The invention relates to a method for manufacturing a fibrous web, such as web of paper, board, tissue or the like. The method comprises obtaining at least one fibre suspension of lignocellulosic and / or cellulosic fibres and feeding the fibre suspension into an intermediate residence entity, such as pulper, storage tower or broke tower. Fibre suspension, which comprises bacterial endospores, is discharged out of the intermediate residence entity via an outlet after a residence time of at least 2 hours in the intermediate residence entity and after a time delay the fibre suspension is formed into a fibrous web. Bacterial endospores are sensitised by adding a germinant surfactant, which comprises a primary or secondary ammonium head group and a linear unsubstituted C12-alkyl tail, to the fibre suspension at an addition point, which is located at the lower part of the intermediate residence entity or after the outlet of the intermediate residence entity, but before the formation of the fibrous web.

A hybrid insulation product and related method for making the insulation product. The insulation product includes one or more feedstock components that may include one or more cellulosic feedstock components, wherein a first portion of the one or more feedstock components is treated with wet fire retardancy material, and a second portion of the one or more feedstock components is treated with dry fire retardancy material. The one or more feedstock components may include in addition to one or more cellulose feedstocks, one or more agricultural fiber sources.

A method (100) for treating a vegetable raw material (20) is specified. The method (100) comprises the following steps: a) providing a vegetable raw material (20), (101), b) covering the vegetable raw material (20) completely with a fluid (13), (102), c) fermenting and / or allowing the vegetable raw material (20) to decompose under anaerobic conditions, wherein acids are formed and are dispensed into the fluid (13), (103), d) removing the acidic fluid (24) at least partially, (108), and e) adding further fluid (13), (110). In addition, a device (1) for treating a vegetable raw material (20) is specified.

According to an example aspect of the present invention, there is provided a method for manufacturing cellulose films and / or coatings from alkaline cellulose solutions via citric acid regeneration coagulation.

There is provided a method of producing a highly refined pulp, comprising the steps of: - providing a pulp; - subjecting the pulp to a first conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, such as about 1.0 mm, and a groove width of 1.0-2.0 mm, such as 1.4-2.0 mm, such as about 1.6 mm; and - subjecting the pulp from the first conical refining step to a second conical refining step in at least one conical refiner comprising refining plates having a bar width of 0.5-1.5 mm, such as about 1.0 mm, and a groove width of 0.8-1.6 mm, such as 1.0-1.5 mm, to obtain the highly refined pulp.

The present invention relates to a method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Dissolving pulp (DP) or kraft pulp is produced at a pulp mill, and the DP or kraft pulp is activated. The activated pulp is reacted with urea to produce cellulose carbamate whereby ammonia is released. The cellulose carbamate production is integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.

Processes disclosed are capable of converting biomass into high-crystallinity nanocellulose with low mechanical energy input. In some variations, the process includes fractionating biomass with sulfur dioxide or a sulfite compound and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and mechanically treating the cellulose-rich solids to form nanofibrils and / or nanocrystals. The total mechanical energy may be less than 500 kilowatt-hours per ton. The crystallinity of the nanocellulose material may be 80% or higher, translating into good reinforcing properties for composites. The nanocellulose material may include nanofibrillated cellulose, nanocrystalline cellulose, or both. In some embodiments, the nanocellulose material is hydrophobic via deposition of some lignin onto the cellulose surface. Optionally, sugars derived from amorphous cellulose and hemicellulose may be separately fermented, such as to monomers for various polymers. These polymers may be combined with the nanocellulose to form completely renewable composites.

Natural bamboo is chemically treated to remove at least some lignin therefrom. As a result, the bamboo becomes more porous and less rigid, while otherwise retaining the aligned microstructure of bamboo fibers and constituent cellulose nanofibers. In some embodiments, the treated bamboo can then be pressed such that the lumina therein at least partially collapse, thereby improving the strength and toughness of the bamboo among other properties. In some embodiments, the treated bamboo can be infiltrated with a polymer or polymer precursor, and / or have non-native particles added to surfaces thereof to tailor properties of the resulting bamboo structure. By further modifying, manipulating, or machining the treated bamboo, it can be adapted to various applications.

The present disclosure provides methods for treating biowaste and similar waste sources with nitric acid. Where the waste source includes plant-based fibrous materials, animal and food waste, the present methods provide for the extraction and use of nanostructured cellulose (nanocellulose) with an anionic surface charge for adsorption of cationic contaminants such as ammonium, and selective environmentally friendly methods for the functionalization of cellulosic biomass.