367results about "Retention agents addition" patented technology

The present invention discloses a water-based emulsion of PHA, PBAT and PVOH and its application in paper-based barrier coatings. This emulsion is prepared by first melt-blending PHA and PBAT at 150-170 °C and then dispersing them into an aqueous PVOH solution at 80-95 °C. Plasticizers, cross-linking agents and surfactants can be added to improve the performance. After coating on paper and drying at 80-150 °C, a barrier film with a Cobb value of 10-15 g / m² and a Kit ≥ 10 grade is formed. Compared with traditional PE film laminating or fluorine-containing coatings, this system is more environmentally friendly and recyclable; PVOH dissolves in pulping water, PHA and PBAT are easily separated, and fibers can be efficiently recovered; in composting, soil and marine environments, PHA and PBAT have extensive biodegradability and are superior to PLA which is difficult to recycle and requires industrial composting. It is applicable to food, industrial, special packaging and agricultural paper products.

Processes for the manufacture of hygiene paper products according to the present disclosure may include re-floating the pulp containing non-wood fibers before the pulp is fed into a riser box; forming a web comprising the non-wood fibers; creating zones of different density in the web; and creping the web.

Hygiene fabric products of the present disclosure may comprise a layer comprising a first layer and / or a second layer. At least one of the first and second layers may comprise approximately 55% to approximately 95% non-wood fibers. Hygiene fabric products of the present disclosure may comprise non-wood fibers and a layer comprising a first layer and a second layer. The first layer may be a consumer-facing layer, wherein the consumer-facing layer may have a consumer-facing side, and the consumer-facing side may comprise a plurality of cushions. Hygiene fabric products of the present disclosure may comprise non-wood fibers and have a lint value of more than approximately 6.

The invention discloses a PHA (polyhydroxyalkanoate), PBAT (poly (butyleneadipate-co-terephthalate)) and PVOH (polyvinyl alcohol) blended water-based emulsion and application thereof in a paper-based barrier coating. The emulsion is prepared by performing melt blending on PHA and PBAT at 150-170 DEG C and then dispersing the mixture into a PVOH aqueous solution at 80-95 DEG C, and a plasticizer, a cross-linking agent and a surfactant can be added to improve the performance. And after coating paper, drying at the temperature of 80-150 DEG C to form the barrier film with the Cobb value of 10-15g / m and the Kit greater than or equal to grade 10. Compared with a traditional PE film or fluorine-containing coating, the system is more environmentally friendly and recyclable; pVOH is dissolved in pulping water, PHA and PBAT are easy to separate, and fibers are efficiently recycled; in compost, soil and marine environments, PHA and PBAT have wide biodegradability and are superior to PLA which is difficult to recycle and re-slurry and needs industrial compost. The method is suitable for food, industrial, special packaging and agricultural paper products.

Hygiene wipe products of the present disclosure may comprise non-wood fibers selected from the group consisting of bamboo, abaca, and mixtures thereof, and may have a TS7 of less than approximately 14 dBV. 2 The hygiene wipe products described in this disclosure may include bamboo fibers and have a TS750 of less than approximately 20 dBV. 2 The hygiene wipe products of the present disclosure may be structured and comprise non-wood fibers selected from the group consisting of bamboo, abaca, and mixtures thereof, and may have a TS750 of less than approximately 45 dBV. 2Hygienic wipe products of the present disclosure may include non-wood fibers selected from the group consisting of bamboo, abaca, and mixtures thereof, and may have a slip-stick value of less than approximately 435. Hygienic wipe products of the present disclosure may include non-wood fibers selected from the group consisting of bamboo, abaca, and mixtures thereof, and may have a slip-stick value of less than approximately 605.

The invention relates to the technical field of papermaking, and particularly provides high-strength tipping base paper for cigarettes and a preparation process of the high-strength tipping base paper. The tipping paper base paper for the cigarettes comprises a fiber raw material; functionalizing the nano cellulose; a cellulase; a dry strength agent; a wet strength agent; and a sizing agent. Nano cellulose is functionalized and a synergistic stepped enhancement mechanism is constructed, so that the synergistic breakthrough of the high-strength raw tipping paper for cigarettes in the aspects of strength, wet strength and air permeability is realized; after the functionalized nanocellulose is subjected to carboxylation treatment, the hydrogen bond and electrostatic adsorption between the functionalized nanocellulose and the fiber are enhanced, and the bonding strength in a dry state and a wet state is remarkably improved; meanwhile, the wet strength agent is added in stages, and the adsorption sequence of the dry strength agent is optimized, so that the reinforcing agent constructs a stable three-dimensional network framework in the paper sheet, and the end breaking risk under high-speed winding is effectively reduced.

The invention discloses a cationic core-shell PHA nano-emulsion reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The problems that a traditional wet strength agent is poor in environmental protection property and difficult to recycle, and a conventional bio-based material needs high-temperature curing and is high in energy consumption are solved. According to the reinforcing agent, low-MFFT bio-based polyhydroxyalkanoate is used as a core, and a positive ion shell layer with strong positive charges is wrapped outside the core. The method has the core advantages that extra high-temperature curing is not needed, the film can be efficiently formed under the conventional 105 DEG C drying condition, and the energy consumption is remarkably reduced; meanwhile, high dry and wet strength and water resistance are achieved, the treated paper has excellent re-pulping recycling suitability, and the industrial pain point that traditional wet strength paper is difficult to recycle is solved.

The present invention belongs to the technical field of special paper preparation, and particularly relates to a production method of high-strength aluminized base paper, comprising the steps of: S1, beating: respectively beating long-fiber primary pulp and short-fiber primary pulp, wherein the beating degree of the long fiber is 40-50°SR, and the beating degree of the short fiber is 20-30°SR; S2, adding additives: adding modified inorganic filler, cationic starch and retention aid to the short-fiber pulp; S3, pulp mixing: mixing the long-fiber pulp and the short-fiber pulp according to a weight ratio, and then adding modified bamboo fiber, and uniformly stirring to form a mixed pulp; S4, wire drawing and papermaking; S5, spraying a surface treatment agent; S6, paper drying, calendering and winding. The aluminized base paper obtained by the production method of the high-strength aluminized base paper of the present invention has the advantages of high strength and good smoothness.

The invention provides a method for increasing the content and distribution uniformity of filler in paper sheets and increasing the strength of the paper sheets, and belongs to the technical field of papermaking. The method for improving the content and distribution uniformity of the filler in the paper sheet and increasing the strength of the paper sheet comprises the following steps: preparing a modified composite nanofiber dispersion liquid, preparing a positive electric buffer solution, preparing a positive electric composite slow release solution, preparing a filler particle suspension liquid, and mixing and manufacturing paper with pulp. According to the method for improving the content and the distribution uniformity of the filler in the paper sheet and improving the strength of the paper sheet, the flocculation speed of the filler can be mildly and effectively controlled, the size of floccules can be controllably adjusted, the distribution uniformity of the filler in the paper sheet can be improved while the content of the filler in the paper sheet is improved, and the paper sheet strength is improved. The adverse effect on the mechanical property of the paper sheet caused by filler dosage increase is effectively avoided, and the paper sheet strength is further improved.

The present invention relates to a multilayer sheet liner for a food or beverage packaging material, the multilayer sheet liner comprising: a first ply comprising at least 70% by weight of unbleached kraft pulp and less than 30% by weight of neutral sulfite semi-chemical (NSSC) pulp, based on dry weight, and a second ply comprising at least 70% by weight of unbleached kraft pulp and less than 30% by weight of neutral sulfite semi-chemical (NSSC) pulp, based on dry weight, wherein the second ply comprises at least 50% by weight of NSSC pulp and less than 50% by weight of unbleached kraft pulp based on dry weight, and wherein the NSSC pulp in the second ply is a washed NSSC pulp having an ash content of less than 1.8% by weight as determined according to Standard ISO 1762: 2019. The invention relates to a method for manufacturing the multilayer sheet liner.

The invention provides antireflection eye protection functional paper and a preparation method thereof. According to the preparation method, the coating with specific content components is adopted and matched with specific process steps, overall good interaction is achieved, compared with coated base paper, the diffuse reflection rates of the prepared anti-reflection eye-protecting functional paper are reduced by 10.07% at 315 nm and 6.77% at 400 nm respectively in a harmful blue-violet light area (400-480 nm) and an ultraviolet light area (especially UVA with the wavelength range of 315-400 nm), and the anti-reflection eye-protecting functional paper has the beneficial effects that the anti-reflection eye-protecting functional paper is good in anti-reflection effect and good in anti-reflection effect. The damage of harmful light to the retina of human eyes can be effectively reduced, and the effects of preventing myopia and protecting eyes are achieved; meanwhile, compared with coated raw paper, the reflectivity of the anti-reflection type eye protection functional paper is increased by 0.2% on the contrary within the 500-700 nm wave band comfortable for human eye reading, and the reading experience feeling of readers is further guaranteed.

The invention discloses a bio-based composition and application of the bio-based composition as a paper-plastic pulp additive. The bio-based composition comprises a component A, a component B and a component C, wherein the component A is one or two of a biomass material or a cationized biomass material; the biomass material and the cationized biomass material have a dendritic, fibrous, sheet-shaped, pinniform, flocculent or porous spongy structure; the component B is selected from one, two or more of PHA (polyhydroxyalkanoate), AKD (alkyl ketene dimer), PGA (polyglutamic acid), PLA (polylactic acid), PBAT (polybutylene adipate-co-terephthalate), cellulose ester and cellulose ether; a component C: a retention aid; the bio-based composition does not contain a reinforcing agent, a sizing agent and / or a mineral filler. The bio-based composition provided by the invention is used for paper pulp molding production, and can effectively improve the physical strength indexes of paper plastic, such as ring crush compression resistance, tear strength, bursting strength and / or tensile strength. Mold sticking and mold hole blocking can be avoided, and the production efficiency is improved.

The invention provides a paperboard and a preparation method thereof. The preparation method comprises the steps that paper pulp is prepared, the paper pulp comprises core layer paper pulp, face lining layer paper pulp, face layer paper pulp and bottom layer paper pulp, and microfibrillated cellulose and chemical pulp are added to at least one of the face lining layer paper pulp and the bottom layer paper pulp to be ground together before grinding; making raw paper from the paper pulp; and coating surface glue on the surface of the surface layer of the body paper. According to the preparation method of the paperboard provided by the embodiment of the invention, the adding point of the MFC applied to the high-speed paper machine system is determined, the influence on the paper machine system is reduced, and dehydration of the pulp and operation of the paper machine are ensured. By combining the papermaking characteristics of a multi-layer paper machine, the surface lining layer and the bottom layer applied to the paper sheets can effectively improve the interlayer bonding strength between the paper sheets, improve TV-16, reduce the use amount of spraying starch in the conventional process or cancel the spraying starch, and improve the operation of the paper machine.

Sanitary tissue products of the present disclosure may comprise a ply consisting of a first layer and / or a second layer. At least one of the first and second layers may comprise from about 55% to abou

The present invention relates to a multi-ply liner for use as a packaging material for food or beverages, the multi-ply liner comprising a first ply and a second ply, wherein the first ply comprises at least 70 wt% unbleached kraft pulp and less than 30 wt% neutral sulfite semi-chemical (NSSC) pulp based on dry weight, and the second ply comprises at least 50 wt% NSSC pulp and less than 50 wt% unbleached kraft pulp based on dry weight, and the NSSC pulp in the second ply is a washed NSSC pulp having an ash content of less than 1.8 wt% determined in accordance with ISO standard 1762:2019. The present invention further relates to a method for manufacturing the multi-ply liner.

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 invention relates to a composition for use in a manufacture of paper, board or the like. The composition comprises a mixture of cationic starch having amylopectin content of at least 85%, and an amphoteric polymeric structure comprising structural units originating from non-ionic monomers, preferably (meth)acrylamide, anionic groups and cationic groups, the polymeric structure comprising cationic groups at least 0.2 mol-%.

The invention provides a low-interception hollow paper tube, and belongs to the technical field of tobacco heating. The low-interception hollow paper tube has a multi-layer structure and comprises at least one low-interception layer and at least one heat-resistant layer, wherein the innermost layer of the multi-layer structure is a low-interception layer, and the low-interception layer comprises paper and a smoothing agent coating formed on the inner surface of the paper. The invention further provides a preparation method of the low-interception hollow paper tube and a heated cigarette. According to the low-interception hollow paper tube, interception of aerosol on the inner wall of the paper tube can be reduced, meanwhile, heat can be prevented from being transmitted to the acetate fiber filter tip section, and the lip scalding problem is avoided.

The invention discloses a silica powder modified paperboard material of embossed frame paper for cigarettes and a preparation method of the silica powder modified paperboard material, and belongs to the field of advanced inorganic non-metallic materials. The material comprises bleached chemical wood pulp, core-shell structure in-situ modified nano silicon micropowder, an auxiliary agent and a latent temperature-sensitive cross-linking agent, a modification system contains a compound silane coupling agent and amino modified organosilane, and a dual network of static triple cross-linking and dynamic secondary cross-linking is formed; the nanometer silicon micro powder is of a core-micro-nano protrusion-shell multilevel structure, a shell layer is thermoplastic resin containing latent epoxy groups, and a double-peak particle size distribution design is adopted. The preparation process is realized through in-situ generation modification, high-speed shearing fusion and an embossing-shaping integrated closed-loop control process, and is adaptive to an existing fourdrinier papermaking production line. The product quantification is 210-220 g / m < 2 >, the transverse stiffness is larger than or equal to 210 mN.m, the embossing retention rate is larger than or equal to 99.5%, after 50 cycles at the temperature of-5 DEG C-40 DEG C and the humidity of 30%-80%, the stiffness is reduced by smaller than or equal to 3%, the barrier property is reduced by smaller than or equal to 6%, the printing adsorption uniformity error is smaller than or equal to 3%, and the barrier property and the environmental protection property are excellent. The method solves the problems of agglomeration, embossing resilience, multi-performance contradiction, poor environmental stability and other pain points of conventional modified filler, realizes the cooperation of low quantification and high performance, conforms to the high-end and green requirements of the tobacco industry, can pass the application of strategic emerging industry priority review channels, and has a wide application prospect.

The invention belongs to the field of new materials, and relates to an ultrathin thermal insulation material and a preparation method thereof. Aiming at main problems of existing aerogel heat insulation products and actual requirements of related fields on efficient heat insulation products, in combination with functional characteristics of nano-porous silicon, natural plant fibers are taken as carriers, SiO2 aerogel, nano-porous silicon and other functional materials are uniformly mixed with the plant fibers, and the composite material is prepared. And an environment-friendly and degradable new product with heat preservation and heat insulation functions is obtained through a papermaking process. The heat conductivity coefficient of the obtained ultrathin heat preservation and insulation material is smaller than or equal to 0.025 W / (m.K), and a convenient method is provided for large-scale and continuous production of the low-cost ultrathin heat preservation and insulation material. The method is easy and flexible to operate, high in operability and easy to industrially popularize and apply.

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 discloses a preparation technology of collection paper literature deacidification test paper, and belongs to the technical field of papermaking engineering. The method comprises the following steps: firstly, determining physicochemical indexes of the deacidification test paper according to ontology characteristics of precious ancient books and recent modern paper literatures, then taking saponified rosin size as an internal sizing agent, taking talcum powder as a filler, taking cationic polyacrylamide (CPAM) as a retention aid, and finally, carrying out papermaking and drying to obtain the deacidification test paper. The performance of the product prepared by the process is basically consistent with that of recent modern literature paper, the product has the capability of replacing a paper literature body to carry out lossy testing, and a more reliable, more comprehensive and more economical basis can be provided for constructing a deacidification effect evaluation system.

The invention discloses an acid-neutral nano PHA paperboard reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The reinforcing agent is a bio-based nano water-based emulsion, and the core of the reinforcing agent is that a stable high-positive-charge nanoparticle interface is constructed under an acid-neutral window through the synergistic effect of polyphenol and an amine polymer. The environment-friendly wet strength agent solves the potential safety hazard of the traditional wet strength agent, and does not contain free formaldehyde and epichlorohydrin. The method has the outstanding advantages that the method is completely compatible with a modern papermaking acid-neutral process, and the defect that the similar bio-based technology needs to react under alkalinity is overcome; the adhesive is flexible to apply, can be efficiently used for wet end addition, or can be stably compounded with oxidized starch for surface sizing; the preparation method is simple, efficient and energy-saving, can realize excellent wet strength retention rate and dry strength improvement under the conditions of low addition amount and conventional industrial drying at 105 DEG C, and does not need extra high-temperature curing.

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.

Provided is a method for the production of vinylcarboxamide-containing polymers in a granular, beaded, powdered, or particulate form and subsequent hydrolysis thereof. The vinylcarboxamide-containing polymers and co-polymers, are precipitated in a granular, beaded, powdered, or particulate form employing an inverse suspension polymerization technique.

There is provided a method of forming a multilayer paperboard comprising a top layer, a back layer and a middle layer, wherein the method comprises the following steps: - providing a top layer furnish comprising at least 50% by dry weight kraft pulp; - providing a middle layer furnish comprising 25-75% by dry weight of maple chemithermomechanical pulp (CTMP) and 15-65% by dry weight of broke pulp; - adding a cationic retention aid to the middle layer furnish in an amount of 250-700 g / tonne based on dry weight of the middle layer furnish; - adding an anionic retention aid to the middle layer furnish in an amount of 420-700 g / tonne based on dry weight of the middle layer furnish; - providing a back layer furnish comprising at least 80% by dry weight kraft pulp; - form a top layer from the top layer furnish, a middle layer from the middle layer furnish, and a back layer from the back layer furnish; and - form a multilayer paperboard from the top layer, middle layer and back layer so that the middle layer is arranged between the top layer and back layer.

The invention provides a paper product, papermaking pulp, papermaking filler and a preparation method thereof. The preparation method of the papermaking filler comprises the following steps: preparing an aqueous solution of ground calcium carbonate; adding a first cation coating reagent to the solution; adding microfibrillated cellulose to the solution; and adding a second cation coating reagent to the solution. According to the preparation method of the papermaking filler provided by the embodiment of the invention, the filler is pre-flocculated by adopting a ternary coating technology (the first cation coating reagent is firstly added, then the microfibrillated cellulose is added, and finally the second cation coating reagent is added), so that the retention rate and the paper sheet strength of the filler can be greatly improved; in addition, the influence of the polyhydroxy characteristic of the microfibrillated cellulose on water filtration of paper sheets can be reduced, and the hydroxyl combination effect between fibers can be fully exerted.

The invention relates to the field of paper plastics, and in particular to a paper plastic slurry, a paper plastic product and a paper plastic manufacturing process. The paper plastic slurry comprises fiber slurry and a plurality of additives. The paper plastic slurry is used to prepare the paper plastic product through pulping, slurry mixing, molding, shaping and the like. The paper plastic manufacturing process provided by the invention is simple, and the final paper plastic product has excellent strength and hardness, and excellent waterproof and moisture-proof performance. Each additive is added separately, and other additives are added after mixing for a certain period of time. Due to the different viscosities and surface charges of various additives and the different functions played by them, each additive is added according to the adding sequence of the invention, so that each additive can play a better effect. Through the coordination of a plurality of additives, the characteristics and functions of each additive are fully utilized, and the superposition of effects is achieved, so that the paper plastic product obtained by the paper plastic manufacturing process has excellent strength, hardness, waterproof and moisture-proof performance.