700 results about "Cellulose pulp" patented technology

An enhanced, co-formed fibrous web structure is disclosed. The web structure may have a co-formed core layer sandwiched between two scrim layers. The core layer may be formed of a blend of cellulose pulp fibers and melt spun filaments. The scrim layers may be formed of melt spun filaments. Filaments of one or both of the scrim layers, and optionally the core layer, may also be meltblown filaments. The core layer may include consolidated masses of cellulose pulp fibers to, for example, enhance texture and cleaning efficacy of a wet wipe made from the structure. The material forming the consolidated masses may be selected and/or processed so as to cause the masses to have reduced visual discernibility relative the surrounding areas of the structure, when the fibrous web structure is wetted. A method for forming the structure, including formation and inclusion of the consolidated masses, is also disclosed.

The invention relates to a cellulose extracting technology, and specifically relates to a technology that utilizes organic acids to extract cellulose from biomass raw materials in the presence of a hydrogen peroxide catalyst. The technology comprises the following steps: in the presence of a hydrogen peroxide catalyst, utilizing an organic acid to cook biomass raw materials, wherein the organic acid is composed of formic acid with a concentration of 70 to 95 wt% and acetic acid with a concentration of 70 to 95 wt%; extracting and screening so as to obtain screened cellulose pulp; and further bleaching the screened pulp so as to obtain the target cellulose; wherein the cellulose is dissolving pulp or industrial cellulose. The alpha-cellulose content of the cellulose obtained by the method provided by the invention is more than 90 wt%. The technology has the advantages of simple route and low energy consumption.

An enhanced, co-formed fibrous web structure is disclosed. The web structure may have a co-formed core layer sandwiched between two scrim layers. The core layer may be formed of a blend of cellulose pulp fibers and melt spun filaments. The scrim layers may be formed of melt spun filaments, and the filaments forming one or both scrim layers may have a number average diameter of 4.5 μm or less. Filaments of one or both of the scrim layers, and optionally the core layer, may also be meltblown filaments. Alternatively, the filaments forming the scrim layers may constitute from 1 to 13 percent of the weight of the structure. Alternatively, the scrim layers may have a combined basis weight of from 0.1 gsm to less than 3.0 gsm. A method for forming the structure, including direct formation of layers, is also disclosed.

A method for manufacturing pulp. The manufactured pulp includes at least 30 w-% nanofibrillated cellulose material measured from the dried pulp. A raw material is introduced to a system. The raw material includes cellulose. At least one type of an optical brightening agent is dosed as a refining additive to the system. The raw material is refined in the presence of the dosed optical brightening agent in at least one pre-refining stage or fibrillation stage to form fibrillar cellulose material.

The invention relates to a preparation method of cellulose spinning solution, including a mixed solvent with low boiling point, volatile, polar organic solvent as a promoter and the N-methylmorpholine-N oxides (NMMO) of 8-18% moisture content; the cellulose pulp is mixed with the mixed solvent forming a uniform mixed materials; the low boiling point volatile organic solvent is removed from the mixed materials and the low content is lower than 5%, the cellulose of mixed materials is dissolved in the NMMO forming the cellulose spinning solution under heating. The invention is used the promoter delaying swelling and preventing premature dissolution of cellulose to reduce the solvent viscosity, the cellulose is dissolved uniformly, completely, the advantage which the pulp is impregnated directly in the high concentration solvent, and overcomes the abuse of uneven mixed, the used promoter is easy to extract and to recycle.

A process for separating organic components from a pulp mill waste stream comprising the steps of washing a cellulose pulp to obtain an aqueous extraction liquor containing organic components, and separating at least a portion of said organic components from the extraction liquor by passing the extraction liquor through at least one nanofiltration membrane. The process may be used in conjunction with a variety of pulp mill processes, including kraft cooking processes, hot caustic extraction processes, sulfite cooking processes, and bleaching processes.

The invention discloses a high-humidity modulus viscose fiber with dry strength of 3.5-6.0cN/dtex, wet elastic modulus of 0.35-0.60cN/dtex and wet strength of 2.0-4.5cN/dtex, and prepared of cellulose pulp with degree of polymerization of 500-1200 and alpha-cellulose content >=95% by the steps of dip-basifying, squeezing, ageing, yellowing, dissolving, wet spinning moulding, drafting, etc. And it has features of higher intensity and wet modulus, better loop strength performance, and lower brittleness; and the fabrics made by it has features of high intensity, multiple deformation resistance, alkali resistance, etc.

To provide an ideal inkjet recording method capable of full-color printing and of inexpensively providing prints that have a texture similar to those of commercial prints and that offer excellent print quality, image density, image fidelity and smear resistance, by combining a specific recording media and a specific pigment-based inkjet ink. The inkjet recording method uses an ink containing particulate coloring material for printing on a media that includes a substrate composed primarily of cellulose pulp and one or more coated layers formed on at least one surface of the substrate, wherein the media has an air permeability of 0.1 ml/min to 30 ml/min as measured using a Parker Print-Surf.

The invention discloses a method for manufacturing modal fiber, which comprises basification reaction, ageing reaction, yellowing reaction, dissolution of viscose glue, filter of the viscose glue, defoaming of the viscose glue, ripening of the viscose glue, wet spinning, drawing and other related process steps. The method adopts cellulose pulp with alpha cellulose content of less than 95 percent as a raw material, uses common equipment for producing common viscose glue short fiber, and adopts the technology to control a simple and practical special process formulation and a spinning drawing mode to manufacture the modal fiber capable of reaching international standards. The method has the advantages of little investment, easily obtained and low-cost raw materials, high productivity and simple process operation; and the manufactured modal fiber has good quality and stable performance.

An ink-jet recording method including: printing on a medium by ejecting thereon ink having a pH value of 8 or more and containing at least a particulate colorant, emulsion resin and surfactant, the medium prepared by providing at least a coat layer containing a pigment on at least one surface of a substrate containing cellulose pulp as a main component, wherein printing is performed at a deposited ink amount of 15 g/m2 or less, and wherein the medium has a pH value of 8 or more at a paper surface, and the amount of pure water transferring onto a surface of the medium having the coat layer after a contact time of 100 ms measured with a dynamic scanning absorptometer is 30 mL/m2 or less and the amount of pure water transferring onto the surface of the medium after a contact time of 400 ms is 35 mL/m2 or less.

The present invention provides an image forming method at least including: applying, by an inkjet method, an ink composition containing at least one pigment as a coloring material, at least one kind of resin particles, at least one fluorine-based surfactant and water, on a recording medium which has a single pigment layer or multiple pigment layers on or above at least one surface of a support containing a cellulose pulp as a main component, and has an amount of transfer of purified water to a medium, when measured with a dynamic scanning absorptometer, of from 1 ml/m² to 15 ml/m² for a contact time of 100 ms, and of from 2 ml/m² to 20 ml/m² for a contact time of 400 ms; and applying a treatment liquid containing at least one aggregating agent that aggregates components in the ink composition.

This invention discloses a method for separating biomass organic components. The method comprises: washing classified raw materials, decomposing in a high-pressure reactor under the actions of microwave and ultrasonic wave, and extracting organic components from biomass with 20-70 vol. % aqueous solution of an organic solvent. The separation process comprises: (1) extracting low-temperature-soluble organic component from biomass at 40-120 deg.C under 0.4-0.6 MPa; (2) separating cellulose pulp at 160-220 deg.C; (3) separating acetic acid, lignin and furfural from the liquid (separated by solid-liquid separation) by centrifuge and precipitation. According to different plants, the powers and frequencies of microwave and ultrasonic wave, as well as the reaction temperature and time can be adjusted. The method has such advantages as low organic molecule loss, little change, no harm of the products, high cellulose purity (higher than 95%), low lignin residue (not higher than 2%), and no environmental pollution.

A cellulose solution containing components as follow: cellulose, which is 7.0%-30.0% of weight of cellulose solution, other components of are imidazolium ionic liquid which can dissolve cellulose and organic solvent mutual soluble with the imidazolium ionic liquid, with a weight ratio ranging from 1:9 to 24:1. The aforementioned cellulose solution is prepared by: mixing cellulose pulp with other components, preparing uniform cellulose solution by steps of heating, stirring, kneading, and vacuumizing. The cellulose solution prepared by aforementioned method can reduce hardness in process, relieving abrasion of apparatus, and the prepared solution is high in concentration, stable and hard to degrade. And cost can be reduced, suitable for industrialization.

A process for making a stiffened and rigid paper includes preparing a pulp slurry consisting essentially of water, a cellulosic pulp, a crosslinker, and a starch, and optionally a binder; draining the liquid from the pulp slurry to form a web; and drying the web. Alternatively, a process for making a stiffened and rigid paper includes the step of adding at least one crosslinker at one or more locations, such as at the wet-end, dry-end, or at both ends of the papermaking process. Suitable crosslinkers include a glyoxal-containing crosslinker, a gluteraldehyde, a polyfunctional aziridine, a zirconium-containing crosslinker, a titanium-containing crosslinker, and an epichlorohydrin, and mixtures thereof. When a binder is employed, it can be added either in the dry or wet form. Provided is a neutral or alkaline process to produce a paper product having the improved mechanical properties of a laminated product in the Z-direction, without a lamination step.

A pulp making process in which fibrous cellulosic material is pulped to form an aqueous suspension of cellulosic material, the suspension is drained through a screen to form a pulp sheet and that the pulp sheet is dried to form a dry market pulp, in which a water soluble cationic polymer is added to the suspension as the sole drainage aid wherein the water-soluble cationic polymer is either,

• • i) a copolymer comprising (a) between 1 and 70 mole % (meth) acrylamide and (b) between 30 and 99 mole % (meth) acryloyloxyethyltrimethyl ammonium chloride with an intrinsic viscosity between 5 and 9 dl/g; or
  • ii) a hydrolysed homopolymer of vinylformamide comprising between 1 and 100 mole % vinyl amine units and having a K value of between 45 and 240.

The process of the invention provides improved drainage time and solids content of the dewatered pulp.

A recording paper including a substrate which includes cellulose pulp and has a surface treated with a surface sizing solution, wherein the surface sizing solution contains a surface sizing agent and a nonionic surfactant having an HLB in a range of 6 to 13, a content of the nonionic surfactant is in a range of 1 to 100 parts by weight per 100 parts by weight of the surface sizing agent, and the surface sizing agent has a contact angle with water in a range of 40 to 75°.

The invention relates to a luminescent Lyocell fiber preparation method. The method includes the following steps: a rare-earth luminescent material and micro antioxidants occupying 1 to 20 percent of a fibrin pulp weight are added into NMMO water solution, and suspension is obtained after ultrasonic dispersing and mechanical stirring; the suspension and fibrin pulp occupying 5 to 15 percent of the NMMO weight are arranged into a reaction kettle, the mixture is swelled for 0.5 to 5 hours under temperature of 90 to 120 DEG C and a vacuum degree of minus 0.1 to minus 0.06 MPa, and then the mixture is stirred mechanically for dissolving to obtain a spinning stock-solution; then the spinning stock-solution is delivered to a spinning machine to obtain the required fiber through a dry-wet spinning process. The prepared fiber takes the fibrin fiber as a basic material and the fibrin is provided with hydrophilic hydroxide radical which can integrate with the rare-earth luminescent material in the fiber, and the fiber cannot be dropped off after washing with long service life. The solvent of the invention has the advantages to of non-toxicity and high-recycling rate and the fibrin fiber can be degraded without contamination to environment.

The invention relates to a composition comprising cellulosic fibres having an average degree of substitution of anionic groups of from 0.001 to 0.25, and DEG a length weighted mean fibre length up to 1,100 [mu]m and a length weighted mean fibre width over 10 [mu]m, or DEG a length weighted mean fibre length up to 1,100 [mu]m, and wherein at least 50 % by weight of the cellulosic material is insoluble in water, or DEG a length weighted mean fibre length / width ratio up to 30, or DEG a length weighted mean fibre width over 35 [mu]m. The invention also relates to a composition comprising cellulosic fibres having a specific surface area of at least 1.5 m2/g, a length weighted mean fibre length / width ratio up to 30, and a dry solids content of at least 5 % by weight, based on the weight of the composition, or up to 30 % by weight, based on the total weight of the cellulosic fibres, of cellulosic fibres with a length weighted mean fibre length up to 100 [mu]m. Method of producing a composition comprising cellulosic fibres which comprises subjecting cellulosic fibres to chemical treatment and mechanical treatment, wherein the chemical treatment comprises treating cellulosic fibres with (i) at least one agent containing a carboxyl group, optionally substituted, (ii) at least one oxidant and at least one transition metal, or (iii) at least one nitroxyl radical, and the mechanical treatment comprises subjecting cellulosic fibres to extrusion with a twin-screw extruder or a planetary roller extruder. The invention also relates to a method of producing a composition comprising cellulosic fibres which comprises subjecting cellulosic fibres having an average degree of substitution of anionic groups of from 0.001 to 0.25 to extrusion. The invention also relates to a composition comprising cellulosic fibres obtainable by the methods, a process for producing a cellulosic pulp mixture which comprises mixing the composition with cellulosic pulp, a cellulosic pulp mixture obtainable by the process, and the use of the composition and cellulosic pulp mixture as an additive in the production of paper and board, processes for producing paper and board in which the composition or cellulosic pulp mixture is used, paper and board obtainable by the processes, and various uses of the paper and board.