212results about "Pulp properties modification" patented technology

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.

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 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.

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.

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

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.

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.

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.

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.

The present invention relates to a method for manufacturing a cellulose-based laminate comprising a mineral-based layer in a paper-making machine, the method comprising: a) forming a first web layer on a first wire; b) forming a second web layer comprising 60-95 % by dry weight of a particulate mineral and 5-40 % by dry weight of a binder, on a second wire; and c) laminating the second web layer and the first web layer to obtain a laminate web; and d) dewatering, and optionally drying, the formed laminate web to obtain a cellulose-based laminate comprising a mineral-based layer.

The invention relates to a paper for decorative coating materials, containing cellulosic fibres and synthetic fibres, the synthetic fibres containing at least one polymer and at least one pigment, and the mass ratio of pigment to polymer in the synthetic fibres being 1: 10 to 1: 1. Furthermore, the invention relates to a decorative paper or a decorative film containing the paper according to the invention, and to a method for producing the paper according to the invention, comprising the following steps: (a) providing a pulp mixture, (b) grinding the pulp mixture to a grinding degree of 10 to 45 DEG SR, (c) selectively adding a filler and a wet strength agent to the ground pulp mixture obtained in (b), (d) diluting the mixture obtained in (c), (e) selectively adding auxiliaries, (f) forming a fibrous non-woven fabric, (g) dewatering and drying the fibrous non-woven fabric to obtain the paper, in which synthetic fibers containing at least one polymer and at least one pigment are added after step (d) and before step (f), and in which the mass ratio of pigment to polymer is from 1: 10 to 1: 1.

The present invention relates to a material suitable for manufacturing hydrophobic cellulose-based light-weight products, such as foams and foam papers, comprising any type of cellulose pulp from either soft wood or hardwood, 2 to 10 wt.% of hydrophobic suspension (OAF) to pulp, 0.5 to 5wt% of Chitosan solution in organic acids to pulp, 3 to 10 wt.% of surfactants to the pulp. The invention also relates to a process of making said material and a use thereof.

The present invention relates to a material suitable for manufacturing hydrophobic cellulose-based light-weight products, such as foams and foam papers, comprisingany type of cellulose pulp from either soft wood or hardwood,2 to 10 wt. % of hydrophobic suspension (OAF) to pulp,0.5 to 5 wt % of Chitosan solution in organic acids to pulp, 3 to 10 wt. % of surfactants to the pulp. The invention also relates to a process of making said material and a use thereof.

The invention relates to the field of fiber molded products, and discloses a preparation method of a novel plant fiber molded product, the product and application, and the preparation method comprises the following steps: crushing plant fibers, and carrying out rheology modification on the crushed plant fibers by using a rheology modification material to obtain modified fibers; the mass ratio of the plant fiber to the rheology modified material is 1: (0.005-0.3); mixing the modified fibers with a binder and a waterproof agent to obtain a plant fiber molding blank; the mass ratio of the modified fiber to the binder is 1: (0.01-0.2); extruding the plant fiber molding blank into a mold for molding by utilizing extrusion equipment to obtain a molded plant fiber prefabricated product; and demolding the plant fiber prefabricated product to obtain the plant fiber molded product. The obtained product is good in appearance state and mechanical property, a continuous process is adopted, the production efficiency is obviously improved, and meanwhile, the carbon emission of the product is greatly reduced.

The invention discloses a method for manufacturing a barrier film comprising highly refined cellulose, the method comprising the steps of: a) providing a web comprising at least 50 % of highly refined cellulose having a Schopper-Riegler (SR) value in the range of 80 – 100, which web has a density in the range of 700-1500 kg / m3, and a wet tensile strength retention (MD) of less than 15%, b) applying an aqueous-based solution or dispersion comprising a polymer on the web, which aqueous based solution or dispersion has a solid content of between 5 – 50 wt%, and c) drying the web applied with the aqueous-based solution or dispersion to a solid content of at least 80 wt%, thereby forming the film.

The present disclosure relates to fibrillated fibers and a method for preparing the same. In the present disclosure, there is provided a preparation method capable of providing fibers suitable for complexing with plastics in a more simplified process. According to the preparation method of the present disclosure, microfibers can be easily miniaturized with little energy by growing fine particles on the microfibers to fibrillate the microfibers, and then applying a shear force thereto, and various physical properties can be expressed from the grown fine particles.

The application provides a modified bamboo pulp, a preparation method and application of the modified bamboo pulp in a bamboo pulp roll for a paper pulp molding direct-press process. The mass ratio of short fibers and long fibers in the bamboo pulp is 45-75:55-25 by utilizing the more compact cross-linking characteristics between the short bamboo fibers, and the bamboo pulp is modified by adding a pulp modifier with a mass fraction of 0.1%-0.5% of the bamboo pulp, wherein the pulp modifier is a mixture of a vinyl alkyl polymer, an imidazoline quaternary ammonium salt, an ester quaternary ammonium salt and sodium hydroxide, so that the tightness of the modified bamboo pulp is 0.65-0.70 g / cm 3 , the stiffness is 25-55 mN.m, the swelling of the fibers in the modified bamboo pulp is uniform, and the binding force is better, and the compactness between the fibers is further improved by the fine components in the bamboo pulp and the addition of auxiliary reagents; the three-dimensional structure of the fibers in the bamboo pulp roll produced by using the modified bamboo pulp is more uniform and the compactness is higher, so that the uniformity of the thickness is ensured, and the dimensional stability and mechanical performance indexes of the bamboo pulp roll for the paper pulp molding direct-press process are met.

The present invention relates to a process for the preparation of micro- and / or nanocellulose that is surface functionalized with lactic acid ester, comprising the step of a) mixing wood-derived pulp with 80 to 99 wt% lactic acid at a temperature from 90 to 120°C for 5 to 36 hours under stirring, wherein wt% are weight percentages of the total weight of the solution or of the final material.

The present invention relates to a process for producing a fibrous material with improved dewatering behavior. The fibrous material produced according to the present invention is useful in the preparation of for example films and coatings. The fibrous material can be produced from a suspension comprising MFC or highly refined pulp, from which a part of the solids is removed, followed by heat treatment carried out on the suspension and / or on a wet web formed from the suspension.

A wax-free printable twist wrapper having a grease resistance value of 4, or of from 4 to 12, when measured according to TAPPI Test method T559, and comprising, or consisting of, a paper substrate comprising a mixture of at least one hardwood pulp and at least one softwood pulp, said mixture having a degree of Schopper-Riegler between 35 and 50, preferably 35 and 40, and comprising at least 40 % by weight of at least one hardwood pulp, a print receiving layer on one side of the paper substrate, said print receiving layer comprising at least one binder and at least one clay pigment, and a barrier layer on the other side of the paper substrate, wherein said printable twist wrapper has a moisture content of from 5% to 15% and has a density of 1 g / cm3 or more.