2907results about "Paper recycling" patented technology

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.

The present invention relates to a method using sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL). More specifically, it relates to a sulfite-based chemical process for pretreating biomass in solutions to reduce access barriers of enzymes to the lignocellulose, resulting in efficient conversion through enzymatic saccharification.

In accordance with one aspect, a thermally regulating construction material comprises a base material and a polymeric phase change material bound to the base material, wherein the base material provides reversible temperature regulation properties to the building construction material. In accordance with another aspect, an insulation material for use in building construction comprises a base material and a polymeric phase change material bound to the base material, wherein the base material provides reversible temperature regulation properties to the insulation material. The base material may be selected from the group consisting of foam insulation, loose fill insulation, and batted insulation.

A method for preparing an aqueous suspension comprising microfibrillated cellulose and inorganic particulate material, the method comprising a step of microfibrillating a fibrous substrate comprising cellulose in an aqueous environment in the presence of an inorganic particulate material.

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.

Candidate mappings are generated between two sets of short strings. A set of files related to the two sets of strings is chosen. Each string from the two sets of strings is searched for in the set of files. Any two strings that match the same file are presumed to be related, and are mapped together. These candidate mappings may then be checked by annotators/reviewers.

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 discloses an intelligent identifying card automatic sorting collecting method. Classifying recycling of waste paper, waste plastics, waste metal, waste glass, waste batteries and waste electronic products can be achieved, and intelligent point accumulation can be achieved. Meanwhile, recycling, sorting and automatic point accumulation of PET plastic bottles can be achieved. Classifying recycling of unrecyclable garbage such as kitchen garbage can be achieved. Various recycled waste products are converted into accumulated points suitable for daily consumption according to the number, the weight and the value, and the accumulated points are charged into an intelligent card automatically. According to the method, an intelligent identifying card sorting collecting device (11), a PET bottle recycling device (10), an unrecyclable garbage recycling box (3) and an intelligent card sensor (7) in which accumulated points can be recorded are included. The combination structure can carry out classifying recycling on garbage generated in daily life conveniently, practical value is given to household garbage and is converted into the accumulated points for consumption in daily life, garbage classifying is promoted, and people are encouraged to actively participate in the activities of garbage recycling.

The invention discloses a method for producing corrugated paper by utilizing papermaking waste residues and sludge. The production method comprises the following steps of: (1) pulping: breaking waste cardboard paper; meanwhile, introducing the waste residues and sludge into a hydraulic pulverizer and simultaneously pulverizing and mixing; then feeding into a high-concentration residue removing machine and removing heavy impurities; after the heavy impurities are removed from rough slurry, defibering and grading by a defibering machine; vibrating and screening the pulp by a vibration-frame type flat screen; after good pulp is further screened by a pressure screen, feeding qualified fibers into a circular screen concentrator and concentrating and delivering the qualified fibers into a papermaking section; and (2) papermaking: delivering the pulp into a preparing pool; after delivering to a high-level box by a pump, delivering the pulp to a front pressure screen and carrying out fine screening; then delivering to a circular screen part and a squeezing part; and drying in a drying part, then rewinding, cutting and packaging for storage. The method of the invention recycles the waste residues and the sludge generated in the production, saves great papermaking raw materials, prevents the emission of various waste materials and really achieves zero emission.

The present invention relates to processes for enhancing a refiner's production rate and/or reducing the specific energy consumption for a freeness target through the use of lubricant(s) or carrier(s)/frictionizer(s), respectively.

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.

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, or

2. 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.

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.