1363results about "Cellulose pulp after-treatment modification" patented technology

The invention discloses a method for manufacturing a multiply paperboard comprising the steps of: - forming a web comprising at least a top ply, a back ply, and a middle ply arranged between the top ply and the back ply, wherein the middle ply is formed from a first furnish comprising at least 50 wt% of a HT-CTMP and 0.1 – 10 wt% of glue pulp based on the total dry weight of said first furnish, wherein said glue pulp has a Schopper Riegler (SR) value in the range of 55- 84 as measured according to standard ISO 5267-1 and a mass fraction of fines of less than 25% as measured according to standard ISO 10376:2011, - subjecting the thereof formed three-ply web to pressing in at least one shoe press, and - drying the web. It has been found that the combination of using the said furnish mixture including HT-CTMP and glue pulp with an SR value within said range enables efficient dewatering by use of a shoe press and gives rise to a paperboard with high bulk but maintained or improved strength properties.

The invention provides a preparation method of modified nanocellulose, a biomass coating and a composite paper wood, the preparation method of modified nanocellulose comprises the following steps: a, oxalic acid is heated to a molten state, bleached wood pulp is added to the molten oxalic acid for a reaction, and nanocellulose is obtained; b, dispersing nanocellulose in water, and mixing with coniferyl alcohol solution, hydrogen peroxide solution and first enzyme solution for reaction to obtain DHP-nanocellulose; c, mixing the DHP-nanocellulose with coniferyl alcohol glucoside, a second enzyme solution and a hydrogen peroxide solution, and reacting to obtain the modified nanocellulose. According to the invention, a plant lignification process is simulated, so that crosslinking in lignin-glycan complex forms such as anisole bonds, ester bonds and the like and connection of covalent bonds such as Beta-aryl ether bonds among lignin are regenerated among separated fibers, and the modified nanofiber with high physical strength is obtained; and some environmental pollution problems caused by the use of raw materials and products in a traditional reinforcing method are solved.

Methods and systems for preparing agricultural residue or other agricultural feedstock for use as a pulp. The method includes providing non-wood agricultural residue (e.g., corn stover) or other agricultural feedstock that includes agricultural fibers, chemically pulping the agricultural fibers in a preliminary alkaline chemical pulping process at a low consistency and at a low temperature to produce partially pulped agricultural fibers, such step including separating lignin and hemicellulose from the partially pulped agricultural fibers, introducing the partially pulped agricultural fibers into a first reactor, wherein the first reactor operates at a low temperature of less than 100° C. (e.g., 65° C.), introducing the agricultural fibers from the first reactor into a second reactor, where the second reactor operates at a low temperature, of less than 100° C. (e.g., 94-96° C.), the second reactor operating at a higher temperature than the first reactor, to produce pulped agricultural fibers.

To provide a fibrous cellulose having high reinforcing effect of a resin, a fibrous cellulose composite resin having high intensity, and a method for producing the fibrous cellulose having the high reinforcing effect of the resin.SOLUTION: A fibrous cellulose has an average fiber width of 0.1 μm or more, has some or all of hydroxyl groups substituted with carbamate groups, has a carbamate group substitution rate of 1.0 mmol / g or more, and has a fine rate of 30% or more. The fibrous cellulose composite resin comprises fibrous cellulose and a resin, the fibrous cellulose being the aforementioned fibrous cellulose. Moreover, when producing the fibrous cellulose, a cellulose raw material and urea or the like are heat-treated and some or all of the hydroxyl groups in the cellulose raw material are substituted by the carbamate groups, the fibers are separated until the average fiber width is 0.1 μm or more, the heat treatment is performed such that the carbamate group substitution rate reaches 1.0 mmol / g or more, and the fibers are separated until the fine rate is 30% or more.SELECTED DRAWING: None

To provide a material for thermoforming that contains microfibrous cellulose exhibiting thermoformability.SOLUTION: A material for thermoforming according to an embodiment contains 50 mass% or more of an onium salt-type anion-modified microfibrous cellulose having a number average fiber width of 2-1000 nm.SELECTED DRAWING: None

The invention belongs to the technical field of packaging carton production, and discloses a folding-resistant damp-proof packaging carton and a preparation method thereof. The folding-resistant moisture-proof packaging carton is prepared from the following raw materials in parts by weight: 70 to 80 parts of papermaking wood flour, 8 to 10 parts of filler, 30 to 40 parts of modified plant fiber, 20 to 30 parts of high-toughness plant fiber-based composite material, 8 to 10 parts of carboxymethyl cellulose and 1 to 2 parts of additive. According to the folding-resistant damp-proof packaging carton and the preparation method thereof, the defects that a packaging carton is prone to being affected with damp, cracks exist after being folded for multiple times, and the packaging carton is difficult to reuse are overcome. Through the modified plant fibers and the high-toughness plant fiber-based composite material, the folding resistance of the packaging carton is effectively improved, and meanwhile, the moisture resistance of the carton is also improved.

The invention provides cellulose-based electronic carrier tape paper and a preparation method thereof, and the preparation method comprises the following steps: step (1): soaking a first wood pulp board in water until fibers are swelled, and pulping to obtain pulp; step (2), enabling the basalt nanosheet to react with polyvinylpyrrolidone, so as to obtain a carbonyl modified basalt nanosheet; (3) soaking the second wood pulp board in water until the second wood pulp board is completely defibered to obtain paper pulp, grinding the paper pulp, and carrying out micro-jet nano-homogenization treatment to obtain a cellulose nano-fibril suspension; and (4) uniformly mixing the cellulose nanofibril suspension, carbonyl modified basalt nanosheets and an antistatic agent with the slurry prepared in the step (1), forming a paper sample to obtain a wet paper sheet, and drying to obtain the cellulose-based electronic carrier tape paper. The cellulose-based electronic carrier tape paper prepared by the invention is obviously superior to the traditional electronic carrier tape paper in the aspects of environmental protection, cost, electrostatic protection and mechanical property.

A molded pulp product formed from the molding of a three-dimensional pulp slurry. The pulp slurry comprises a natural fiber composition of virgin fibers which have not been recycled and are derived from plant materials. The natural fiber composition includes hemp fibers which have been micronized to suitable length and combined with pulverized hemp shive to form a fibrous matrix. The molded pulp product is formed from a vacuum molding process, thermoforming process, custom air-burst molding process, or other molding process wherein the slurry is applied to a three-dimensional mold and a three-dimensional product is formed. The resulting packaging product is one hundred percent biodegradable.

The invention provides a defibrating device for preparing high-concentration nano cellulose based on an enzymolysis method.The defibrating device comprises a stirring assembly, a shell and a cover, the stirring assembly comprises a stirring paddle capable of rotating in the first direction, a plurality of first inclined grooves are formed in part of the peripheral face of the stirring paddle, and the shell is provided with an inner cavity, a first opening and a second opening; the shell can move relative to the stirring assembly in the first direction, a plurality of second inclined grooves are formed in the bottom face of the inner cavity, the stirring assembly enters and exits the inner cavity through the first opening, the cover is arranged on the top of the stirring assembly and can move relative to the stirring assembly in the second direction, and a plurality of third inclined grooves are formed in the bottom face of the cover. According to the defibrating device for preparing the high-concentration nano cellulose based on the enzymolysis method, under the auxiliary action of enzyme hydrolysis, materials can be uniformly and efficiently treated in the defibrating process through a multidirectional shearing and friction mechanism, and the problems that defibrating is incomplete and the product size uniformity is poor are solved.

A polymer-nanocellulose-lignin composite as disclosed comprises a polymer, nanocellulose, and lignin, wherein lignin forms a hydrophobic interface between the polymer and the nanocellulose. In some variations, a process is disclosed for producing a polymer-nanocellulose-lignin composite material, comprising: fractionating lignocellulosic biomass in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, wherein lignin deposits onto fiber surfaces or into fiber pores; mechanically treating the cellulose-rich solids to form a hydrophobic nanocellulose material comprising cellulose fibrils and / or cellulose crystals; hydrolyzing the hemicellulose to generate fermentable hemicellulosic sugars; fermenting the fermentable hemicellulosic sugars to generate a monomer or monomer precursor; polymerizing the monomer to produce a polymer; and combining the polymer with the lignin-coated nanocellulose to generate a polymer-nanocellulose-lignin composite material for use in a wide variety of products.

The invention discloses a preparation method and application of high-purity natural cellulose. According to the method, a pre-cooled phosphoric acid / hydrogen peroxide mixed aqueous solution system is adopted, phosphoric acid is a cellulose intercrystalline swelling reagent, and hydrogen peroxide is an oxidation reagent precursor. The invention provides a cellulose intercrystalline swelling strategy to promote full exposure of hemicellulose embedded in a cellulose crystalline region and further realize deep removal of hemicellulose through acidic hydrolysis dissolution; meanwhile, peroxyphosphoric acid is used for promoting oxidative degradation and dissolution of residual lignin under mild conditions, and the purity of natural cellulose is further improved. The natural cellulose prepared by the method has high purity, and can be applied to the field of manufacturing of high-end cellulose of lyocell grade, acetification grade, nitration grade and the like. The method is mild in condition, simple in process and controllable in process, the cellulose industry is promoted to extend to the high end of a value chain, and the method has a wide application prospect.

The invention relates to a method for applying starch to a paper or paperboard web, the method comprising the steps of: providing an aqueous suspension comprising starch particles and at least 1 wt %, based on the dry solid content of the suspension, of an amphiphilic polymer, creating a foam of the aqueous suspension, and applying the foam to the paper or paperboard web. The invention further relates to a paper or paper board product obtained by the method.

The present invention relates to food or liquid packaging laminate comprising fibers obtained from used beverage cartons (UBC), said food or liquid packaging laminate comprising: a paperboard layer, and a barrier layer, wherein said paperboard layer comprises no or substantially no fibers obtained from UBC, wherein said barrier layer comprises a substrate layer comprising a highly refined cellulose composition comprising fibers obtained from UBC, and a polymeric gas barrier coating disposed on at least one side of the substrate layer, and wherein said barrier layer is laminated to said paperboard layer by a polymeric sealing layer arranged between said paperboard layer and said barrier layer.

To provide a wet sheet which is difficult to break on manufacturing a molding, has shape stability, and has easy handling for processing, and a manufacturing method of a molding manufactured from the wet sheet.SOLUTION: A wet sheet includes a pulp and a cellulose fine fiber having an average fiber diameter of 10000 nm or under and has a water content of 60 mass% or over and a thickness of 0.5 mm or over. A manufacturing method of a molding includes a heating and pressurizing step of heating and pressurizing the wet sheet. The wet sheet includes a pulp and a cellulose fine fiber having an average fiber diameter of 10000 nm or under and has a water content of 60 mass% or over and a thickness of 0.5 mm or over.SELECTED DRAWING: Figure 1

The present invention provides formulations comprising a suspension of nanocellulose (NC) elements and a drying / dispersal additive selected from the group consisting of temperature-responsive polymers, small molecule additives in volatile systems, and blocking agents and methods of preparing such formulations, and further provides NC-containing materials, composite materials and useful articles of manufacture made therefrom.

The present invention relates to a method for manufacturing a barrier layer for a paper or paperboard based packaging laminate. said method comprising: a) providing a barrier substrate comprising at least 50 wt % highly refined cellulose pulp (HRC) based on dry weight of the barrier substrate. said HRC having a Schopper-Riegler (SR) number above 80 as determined by standard ISO 5267-1, b) providing a transfer coating substrate comprising a vacuum coating layer and a backing layer separated by a release layer, and c) transferring the vacuum coating layer from the backing layer to the barrier substrate by a transfer coating process using an adhesive layer applied on the barrier substrate and / or the vacuum coating layer to obtain a barrier layer for a paper or paperboard based packaging laminate.

The invention discloses paper pulp, a paper pulp board, a preparation method and application. The paper pulp provided by the invention comprises the following components in parts by weight: 15-50 parts of wood pulp, 10-30 parts of recycled paper pulp, 10-40 parts of barley straw fibers, 2.5-40 parts of vinasse fibers, 3-8 parts of a negative oxygen ion exciting agent, 0.5-8 parts of an adhesive, 0.5-4 parts of a sizing agent and 0-1 part of an additive. According to the provided paper pulp, waste of the wine making industry chain is fully utilized, barley straw fibers, vinasse fibers, wood pulp, recycled paper pulp, the negative oxygen ion exciting agent and the like are combined, the obtained paper pulp fiber is high in strength, and a carton finished product is high in compressive strength and free of peculiar smell. The paper pulp for preparing cartons with excellent performance is provided while the recycling of wastes of a wine brewing industry chain is realized.

The invention belongs to the technical field of corrugated paperboards, and is characterized in that wood fibers and modified bamboo fibers prepared by reaction of allyl bamboo fibers, 1, 4-butanediol di (mercaptoacetate) and magnolol are pulped, a biodegradable water-resistant auxiliary agent is added for hydrophobic modification, papermaking and shaping are carried out to prepare water-resistant base paper, and the water-resistant base paper is prepared by the following steps: pulping the modified bamboo fibers and the biodegradable water-resistant auxiliary agent. And finally, preparing a surface paper layer, a corrugated medium paper layer and an inner paper layer from the water-resistant raw paper, and bonding and pressing to obtain the corrugated board. Magnolol groups grafted on the surfaces of the modified bamboo fibers can improve the water absorption performance of the fibers, and the hydrophobicity of the corrugated board is improved through the synergistic effect of the magnolol groups and the biodegradable water-resistant auxiliaries; the surface of the biodegradable water-resistant auxiliary agent is embedded with a carboxylated nano-cellulose structure, so that the biodegradable water-resistant auxiliary agent has deformation resistance; the epoxidized soybean oil is used as a core part and has excellent hydrophobicity; through combination of a polyphenol structure of tannic acid and hydrogen bonds of water-resistant base paper fibers, the mechanical properties of the corrugated board are improved, and the corrugated board has excellent biodegradability, hydrophobicity and mechanical strength.

The invention relates to a dry strength composition for manufacture of paper, board or the like. The dry strength composition comprises, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content > 80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in the range of 0.1 — 1.5 meq / g, when measured at pH 2.8, and -0.1 — -3 meq / g, preferably -0.3 — -2.5 meq / g, more preferably -0.5 — -2.0 meq / g, when measured as an aqueous solution, at pH 7.0. The invention relates also to a use of the said composition and to a method for manufacturing paper, board or the like.

The invention relates to a method for manufacturing SCK paper having a basis weight in the range of 50 to 100 g / m2, wherein an optimal combination of nonrecycled BCP, BCTMP and recycled pulp obtained from release liner supercalendered Kraft paper is used to adjust the properties of the fiber furnish. While the use of BCTMP enables a product having a higher bulk, the recycled pulp component, which has high compatibility with the paper manufacturing process, enables to balance the manufacturing process and reduce the dimensional changes and shrinkage of the formed SCK paper. The combined presence of the BCTMP and the recycled pulp component in the fiber furnish improves the water removal from the fibers during the SCK paper manufacturing, while the presence of non-recycled BCP produced from softwood improves the formation and runnability of the paper web on the paper machine. This enables to produce SCK paper with improved sustainability, wherein the density may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the SCK paper as substrate layer in a release liner.

The application relates to a method for producing a cellulose-based porous aerogel product, in which cellulose nanofibrils and a phase change material are mixed to form a homogenous suspension mixture, a carbon-based and / or mineral agent is added to the suspension mixture, and the suspension mixture is treated to form the porous aerogel product comprising a three-dimensional shape. Further, the application relates to a method for producing a cellulose-based porous aerogel composition. Further, the application relates to a use of the method.

Described herein is a composite structure that includes microfibrillated cellulose (MFC) monofilament permeated by a hydrophobic resin. Also described herein are a structure and methods of manufacturing the composite material and structure and the uses thereof.

A barrier film (1) for a paper or paperboard-based packaging material, said barrier film comprising a, MFC layer, (2) with a grammage in the range 20-100 g / m2, and a density higher than 650 kg / m3. The barrier film further comprises a PHA, dispersion coated, primer layer (3, 9) coated on at least one side of the MFC layer, wherein the primer layer has a coating weight 0.5-12 g / m2; the primer layer (3, 9) comprises a PHA type selected from the group consisting of PHB, PHBV, PHBH, P(3HB4HB), other co-polymers of PHB, other homopolymers such as PHO, PHH, P3HP, and combinations thereof; and a thin vacuum deposited layer (4) coated on a first primer layer (3) which vacuum deposited layer has a thickness of 20-500 nm, the vacuum deposited layer comprises material selected from the group consisting of aluminum, magnesium, silicon, copper, aluminum oxides, magnesium oxides, silicon oxides and combinations thereof, preferably aluminum oxides.

The present invention relates to a method for preparing a surface-treated gas barrier film, said method comprising the steps of: a) providing a gas barrier substrate comprising at least 50 wt % of a highly refined cellulose pulp based on dry weight; and b) surface treatment of the gas barrier substrate, wherein the surface treatment comprises treating a surface of the gas barrier substrate with a solution comprising an organic acid and sodium carbonate and drying the gas barrier substrate to obtain a surface-treated gas barrier film. The invention further relates to a surface-treated gas barrier film obtained according to the method and a packaging laminate comprising the surface-treated gas barrier film.

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 invention belongs to the technical field of special papermaking and carrier tape paper preparation, and particularly relates to high-strength anti-static carrier tape base paper and a preparation technology thereof.The preparation method comprises the following steps that 1, TEMPO oxidized nano cellulose suspension A is prepared through an oxidation method; step 2, performing pulping treatment to obtain mixed slurry B; step 3, adding the suspension A and carboxylated carbon nanotubes to obtain a suspension slurry system C; the carrier tape body paper is obtained through homogenization, dehydration, squeezing, dehydration and vacuum drying. The invention provides a novel method for preparing the high-strength anti-static carrier tape body paper through TEMPO oxidized nano-fiber reinforcement, carboxylated carbon nano-tube regulation and control of conductivity and vacuum hot-pressing drying, and the method comprises the following steps: cross-linking TEMPO oxidized nano-cellulose and carboxylated carbon nano-tube regulation and control of conductivity; the high-strength anti-static carrier tape base paper and the preparation process thereof are provided to jointly solve the problems of weak strength, low interlayer bonding strength and no anti-static property.

The invention relates to a method for manufacturing SCK paper having a basis weight in the range of 50 to 70 g / m2, wherein an optimal combination of BSKP and BCTMP is used to adjust the properties of the fiber furnish. In SCK papers with low basis weight the bulk of the formed paper web upon paper manufacturing may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the SCK paper as substrate layer in a release liner. Thus SCK paper with exceptionally high share of BCTMP in the fiber furnish may be produced into the same thickness as was possible before for a conventional supercalendered kraft paper having a higher basis weight, while maintaining other quality characteristics of the paper sufficient for use as a substrate layer of an industrial release liner.

The invention provides lightweight sound-absorbing mute cotton and a preparation method thereof, the lightweight sound-absorbing mute cotton is of a bionic gradient structure and is divided into three layers, the bottom layer dissipates high-frequency sound waves, the middle layer optimizes intermediate-frequency resonance, and the upper layer enhances low-frequency sound wave scattering. The preparation method comprises the following steps: respectively preparing bottom-layer slurry, middle-layer slurry and upper-layer slurry; pre-cooling the bottom of a mold, and carrying out synchronous three-layer co-injection molding on the three kinds of slurry: carrying out one-way freezing to form a longitudinal gradient aperture; freezing and drying to obtain a three-layer gradient structure material; immersing in a graphene oxide quantum dot ethanol solution for vacuum treatment; heating, adding ascorbic acid, keeping for 2 hours, and applying 0.5% pre-strain to the material; photo-thermal curing is performed; and performing hot-pressing shaping to obtain the product. The gradient structure design is adopted, and the aperture, the fiber distribution and the filler type are regulated and controlled, so that acoustic impedance gradient change is realized, sound wave reflection is reduced, and the sound absorption efficiency is improved.

The invention discloses a preparation method and application of a cationized composite paper-based material for filtering nano plastic, and belongs to the technical field of nano cellulose. The preparation method comprises the following steps: preparing cationized lignocellulose nanofibers through DES treatment, dissolving out lignin through DES treatment, fully mixing the lignin with a silane coupling agent KH-560 to obtain silanized lignocellulose nanofibers, and then loading a layer of nano lignocellulose material on the surface of a polyvinylidene fluoride filter membrane by adopting a vacuum suction filtration method, and finally, cross-linking polyethyleneimine to obtain the cationized composite paper-based material. The cationized composite paper-based material prepared by the invention is green and environment-friendly, has excellent hydrophilic, antibacterial and recycling performances, and has broad-spectrum effects on the size, concentration and type of carboxylated nano-plastics in efficient capture. The cationized composite paper-based material has the advantages that the carboxylated polystyrene nano-plastic filtering efficiency reaches 97.56%, the filtering flux reaches 1889.99 L.m <-2 >. H <-1 >. Bar <-1 >, the practical application performance of lignocellulose is further widened, and the cationized composite paper-based material has a good application prospect.

The present invention relates to a method for preparing lignocellulose nanofibril and a lignocellulose nanofibril prepared by the method. The present invention also relates to a method for preparing a lignocellulose nanofibri reinforced composite material, and a lignocellulose nanofibri reinforced composite material prepared by the method.