1155results about "Waste paper working-up" patented technology

Cellulose nanofibers have been processed from renewable feedstock in particularly from natural fibers, root crops and agro fibers, wherein the pulp was hydrolysed at a moderate temperature of 50 to 90 degree C., one extraction was performed using dilute acid and one extraction using alkali of concentration less than 10%; and residue was cryocrushed using liquid nitrogen, followed by individualization of the cellulose nanofibers using mechanical shear force. The nanofibers manufactured with this technique have diameters in the range of 20-60 nm and much higher aspect ratios than long fibers. Due to its lightweight and high strength its potential applications will be in aerospace industry and due to their biodegradable potential with tremendous stiffness and strength, they find application in the medical field such as blood bags, cardiac devices, valves as a reinforcing biomaterial.

To provide a paper recycling device capable of recycling paper of increased whiteness level that can be widely used for applications other than paper for newspapers, the paper recycling device of the present invention has a dry type defibrator for crushing and defibrating paper, a first transport pipe for transporting defibrated material that was defibrated by the dry type defibrator, a cyclone for air classifying and deinking the defibrated material transported by the first transport pipe, a second transport pipe for transporting the defibrated material that was deinked by the cyclone, and a paper forming machine for forming paper with the defibrated material transported by the second transport pipe.

A process for producing high bulk cellulosic fiber exhibiting a durable elevated curl index includes: (a) concurrently heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. The curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less. In general, the process is carried out in the presence of saturated steam at a pressure of from about 5 to about 150 psig.

The invention relates to a method for manufacturing paper, paperboard or cardboard comprising the steps of(a) pulping an aqueous cellulosic material containing a starch;(b) preventing at least a portion of the starch from being microbially degraded by treating the aqueous cellulosic material containing the starch with one or more biocides; and(h) adding a dry and / or wet strength polymer to the cellulosic material.

Paperboard having a water-repellant coating which includes a polymer matrix / wax / pigment mixture and is applied to the paperboard as an aqueous formulation. The polymer matrix includes polymer chains which are ionically cross-linked through pendant carboxylic acid groups to provide, together with the wax and pigment components, a substantially continuous, water-repellant film which more readily breaks down under the alkaline conditions of repulping. The coated board also exhibits low slip and resistance to blocking, and is particularly well-suited in corrugated box constructions used in shipping containers for perishable food items such as meats, poultry, fishery products, fruits and vegetables. The pigmented or unpigmented coating formulations are also used as an overcoat over preprinted paperboard surfaces to simultaneously provide scuff and water resistance.

A composite web and process for manufacture from post-industrial scrap wherein the fibers are pre-opened and cut to an average fiber length of about 4 mm. A scrap fiber component and a cellulosic component of such fibers are blended into a fiber furnish. The scrap fiber component includes at least 15% synthetic fibers and may include a blend of natural fibers, high melting point synthetic fibers, and low melting point synthetic fibers. The cellulosic component may include post-industrial cotton fibers which may be refined before blending with the scrap fiber component. The fiber furnish is processed into an intermediate web such as by a drylaid or a wetlaid nonwoven process. The intermediate web is saturated with a latex binding agent and pressed and / or dried to form a composite web capable of further processing into molded or formed consumer or industrial products. The process is capable of producing a high basis weight composite web.

Recyclable and repulpable coated paper stock, preferably for use as ream wrap, comprising a substrate coated on at least one surface with a base coat and at least one additional coat over said base coat. Both coats are water based dispersions of a polymer selected from the group consisting of acrylic polymers, acrylic copolymers, polyvinyl acetate, polyvinyl alcohol, ethylene-vinyl acetate, polyvinyl chloride, styrene butadiene copolymers, polyvinylidiene chloride and its copolymers, or starch. The wax free coating forms a pin-hole free continuous film on the substrate which is resistant to water and water vapor. The invention also includes processes for making and recycling the invented coated paper stocks.

A contaminate separation apparatus for use in separating contaminant materials from cellulose and / or paper fibres in a paper recycling process includes a reservoir for receiving a waste paper slurry therein. The reservoir is provided with an inlet opening for the input of the slurry, one or more fibre discharge outlets or passages, and at least one waste outlet positioned vertically above the fibre discharge outlet opening. An agitator provided in a lower portion of the reservoir generates differential flow currents within the reservoir, to selectively divert plastics, waxes, adhesives and / or other sticky waste materials outwardly towards the waste outlet, while providing a flow of suspended paper and / or cellulose fibres to one or more of the fibre discharge outlets.

The present invention relates to a high strength material and a high strength molded article comprising 65 to 100 wt. % of cellulose microfibrils; and products comprising these. The material, which is lightweight and has a very high strength, can be used for various purposes and can be produced by recycling wastepaper, used cloth and the like. Furthermore, by appropriately selecting the type and / or amount of binder, the material comprising microfibrils as a main component can be decomposed by microbes or the like after being dumped as waste, and is thus friendly to the global environment.

Waxes prepared from hydrogenated plant oils, such as castor, palm, and soybean, are used to prepare water based emulsions. The inventive waxes, obtained from naturally derived, renewable resources, were emulsified under anionic, cationic and nonionic conditions, producing emulsions having a solids content up to about 45% solids. When used to coat fibrous cellulosic articles, such as paperboard, the emulsions' performance was similar to emulsions containing petroleum-derived waxes. The inventive waxes have a low iodine value (between 2-5), and melting points between approximately 120-200 degrees F. (Mettler Drop Point). These waxes comprise a triglyceride whose fatty acids are predominantly stearic acid or ricinoleic acid. The inventive waxes are used as an alternative to petroleum-derived, or expensive naturally-occurring waxes in the manufacture of emulsions used in coatings, polishes, adhesives, paper products, paperboard and other manufacturing operations.

The invention relates to a manufacturing method which utilizes waste residue to produce regenerated yarn cop base paper and an obtained product thereof. The method comprises the following steps: the full stuff of processed waste slurry residue and the full stuff of processed waste paper are mixed according to proportion to carry out sand paper tube forming and then the regenerated yarn cop base paper is obtained. By adopting the method, waste paper resources can be saved, waste water treatment can be reduced, and the obtained regenerated yarn cop base paper has the advantages of low ration, good quality and the like.

The present invention serves for loading a pulp suspension (S) with calcium carbonate. Liquid calcium hydroxide as milk of lime (7) is added during or before the pulp operation (1) carried out to form the pulp. By introducing gaseous carbon dioxide (8) into the pulp suspension thus treated, a chemical reaction is triggered therein, in which the finely divided calcium carbonate is precipitated. The present invention is particularly economic and effective due to the early addition of calcium oxide or calcium hydroxide.

There is provided an endoglucanase enzyme, which is useful for reducing fuzz of regenerated cellulose-containing fabrics, improving the touch and appearance, color clarification, localized variation in color, reducing stiffness and using it as components of a detergent, as well as deinking waste paper and improving freeness of paper pulp. A cDNA coding for the endoglucanase enzyme NCE5 was cloned and its DNA sequence and amino acid sequence derived from it were determined.

The invention belongs to the technical field of a papermaking process and particularly relates to a process for preparing cultural paper by utilizing full-recovered pulp. The process for preparing the cultural paper by utilizing the full-recovered pulp comprises the following preparation steps of: a step A of sorting and loading waste paper raw materials; a step B of beating; a step C of screening and purifying; a step D of carrying out primary floatation deinking; a step E of carrying out primary concentration and heat dispersion; a step F of carrying out secondary floatation deinking; a step G of carrying out secondary concentration and heat dispersion; a step H of carrying out oxidation bleaching; a step I of carrying out reduction bleaching; a step J of storing in a tower; a step K of milling pulp; a step L of preparing the pulp; a step M of forming and manufacturing the paper with the pulp; a step N of squeezing and dehydrating; a step O of drying; a step P of squeezing and sizing; and a step Q of carrying out press polishing and then completing processing of a finished product by the working sections of reeling, rewinding, packaging and warehousing. According to the process disclosed by the invention, the high-quality cultural paper of which the appearance quality and the physical indexes all reach the domestic and overseas standards is produced by utilizing the low-price waste paper raw materials; the production cost is reduced; the production environment is clean and environmental-friendly; and the production efficiency is high.

A process and device for continuously measuring the quantity of particles suspended in a liquid, which exist in at least two different physical states, such as detached or attached within the paper pulp. A separation assembly separates the particles into divisions depending on their size, and the separation assembly is continuously fed with liquid via an input pipe. A measuring and processing assembly has two channels or ducts coming from the separation assembly and are provided with translucent windows. A measurement and capture unit illuminates the windows, and at least two cameras located opposite each of the respective windows are synchronized with the illumination unit to capture, at regular intervals, an image of the windows. A system for digitizing the captured images and processing them to determine the quantity of particles for each physical states is forwarded to an output unit in a digital or analog form.

An object of the present invention is to provide a composition excellent in various flocculation performances for various sludge and papermaking systems, especially excellent as a polymer flocculant, and provide a sludge-dewatering agent excellent in dewatering performances for various sludge, especially excellent in flocculationability, as well as a retention aid which can realize a high retention and ensure excellent formation of paper and which is easy to use.A composition is provided, which comprises two or more amphoteric water-soluble polymers in combination shown below, the polymers being obtained by polymerizing a cationic radical-polymerizable monomer and an anionic radical-polymerizable monomer in a presence of a polysaccharide.1. A combination of a polymer satisfying the molar ratio of the cationic radical-polymerizable monomer to the anionic radical-polymerizable monomer (hereinafter referred to as Ca / An) of Ca / An≧1, and a polymer satisfying Ca / An<1, or2. a combination of two kinds of polymers satisfying Ca / An≧1.

The invention provides a process for de-inking waste newspaper by a biologic enzyme, which relates to the process of the pulping of waste paper. The process is characterized by comprising the following technological procedures of: (1) preparing a de-inking agent: adding one or several of alkali lipase, amylase and xylanase into cellulase to prepare a composite enzyme and then adding 0.05-0.15 kilogram of surfactant into the composite enzyme with the weight to form the de-inking agent, wherein the composite enzyme comprises the following components in proportion: 2000-10000U of cellulase, 10000-100000U of alkali lipase, 1000-5000U of xylanase and 8000-15000U of amylase; (2) pulping by using a high-concentration pulper: adding 40-60 DEG C water into the high-concentration pulper, counting by 100 kilograms of absolutely dry paper, putting 10-150 grams of de-inking agent and 0.2-0.4 kilogram of sodium metassilicate nonahydrate into waste newspaper and journal paper and stopping after starting the pulper for 10-30 minutes; and (3) carrying out the procedures of floatation and printing ink separation to obtain the de-inked pulp. The invention has the advantages that sodium hydroxide and hydrogen peroxide are not used, and the production cost and the wastewater pollution are lowered.

Formulations for pitch control, and methods of making and using thereof, are described herein. The formulations contains one or more 1,3-selective lipases. 1,3-selective lipases catalyze the hydrolysis of the terminal ester groups in triglycerides leaving the internal ester group intact. The enzyme formulations can contain one or more additives, such as dispersants, metal ions, absorbents, adsorbents, cationic polymers, and combinations thereof. The enzyme formulation is typically applied as a solution to the pulp stock. The enzyme formulations can be applied at any of one or more various points during the pulping and paper manufacturing processes. The use of selective lipase(s) decreases the total concentration of fatty acids in the system, and catalyzes the formation of monoglycerides, which are more effective at dispersing fatty acids than glycerol, the product of non-selective lipases, thereby improving pulp and paper machine runnability and pulp and paper quality.

A regeneration method for waste composite paper film material includes a separation step (1) and a separation step (2), wherein the separation step (1) mainly separates mostly paper fiber, and the separation step (2) further separates plastic film or / and plastic-aluminum composite film. The method including two steps can increase quality and quantity of regenerating paper, and reduce content of the plastic film and aluminum foil in the regenerating paper. The waste composite paper film material can be separated and regenerated without pollution, and can be used as raw material or auxiliary material for paper industry, rubber and plastic product industry and aluminum industry, wherein all kinds of recovery components are utilized.

The invention discloses a preparation method for a composite material of cellulose nanofiber and reinforced polyurethane. The method comprises the following steps: 1) pretreating in a chemical method; 2) unfastening fibers in a mechanical method. According to the invention, chemical treatment and mechanical treatment are adopted to separate the cellulose nanofiber, which has a high length diameter ratio and is used for reinforced polyurethane, from newspaper; the transparent nano composite material with high-intensity is prepared; wood meal and newspaper are adopted as raw materials to prepare cellulose nanofiber through the chemical treatment combined with the mechanical treatment; the diameter range of the cellulose nanofiber is 30-100 nm, and the length diameter ratio is higher than 1000.

The present invention relates to a deinking composition and a method of deinking wastepaper by using a mixture of enzymes that act on constituents of all three waste paper components involved in ink retention on final pulp. The first component represents substrates located on the surface and in the internal waste paper structure. The second component represents substrates located in the interface between paper and ink, usually formed by coatings or size-press (starch containing or not) applied layers. The third component represents substrates located in the ink and / or toner compounds. This method provides improved performance in relation to conventional methods, or current deinking with enzymes, which acts on a limited number of substrates involved in ink retention on final pulp.

Method for fabricating fiber and film products and composites includes: introducing an aqueous gel of nanofibrillar cellulose into a volume of organic extraction agent miscible with water so that the aqueous gel is kept as a separate phase and forms one or several discrete physical entities containing the nanofibrillar cellulose within the phase; changing water with the organic extraction agent in said one or several discrete physical entities of nanofibrillar cellulose; and drying the nanofibrillar cellulose by removing the organic extraction agent from the one or several discrete physical entities of nanofibrillar cellulose. In the method the aqueous gel of nanofibrillar cellulose is introduced into the volume of organic extraction agent in the form of one or several elongated elements which form a fiber-like or ribbon-like or film-like product after drying.

A deinking method comprising the steps of liberating ink from waste paper as a raw material and removing the liberated ink from a flotation system, wherein a nonionic surfactant, e.g., a reaction product obtained by adding an alkylene oxide to a mixture of an oil & fat and an alcohol, an alkylene oxide adduct of a fatty acid, or an alkylene oxide adduct of a higher alcohol, is used for the liberation of ink, and the flotation step is effected in the presence of a cationic compound, an amine, an acid salt of an amine or an amphoteric compound at a pH of from 4 to 9, provides a high quality deinked pulp having a high whiteness and a little residual ink spots.

A novel endoglucanase derived from Staphylotrichum coccosporum, a polynucleotide encoding the endoglucanase, and a cellulase preparation containing the endoglucanase are disclosed. The endoglucanase or cellulase preparation is available for a washing use or fabric processing, such as a color clarification of a cellulose-containing fabric, a reduction of fuzz, an improvement of the touch feel and appearance of the fabric, providing a localized color change to the fabric, or a reduction of stiffness.

The invention relates to enzymes having xylanase, mannanase and / or glucanase activity, e.g., catalyzing hydrolysis of internal β-1,4-xylosidic linkages or endo-β-1,4-glucanase linkages; and / or degrading a linear polysaccharide beta-1,4-xylan into xylose. Thus, the invention provides methods and processes for breaking down hemicellulose, which is a major component of the cell wall of plants, including methods and processes for hydrolyzing hemicelluloses in any plant or wood or wood product, wood waste, paper pulp, paper product or paper waste or byproduct. In addition, methods of designing new xylanases, mannanases and / or glucanases and methods of use thereof are also provided. The xylanases, mannanases and / or glucanases have increased activity and stability at increased pH and temperature.