395 results about "Pulp fibre" patented technology

Enhanced removal and/or control of adhesives or sticky materials, “stickies”, from recovered paper stock or virgin pulp fibers is achieved using a combination of enzyme treatment with adsorbents and/or absorbents. Pulp stock to be treated is typically obtained from old magazines, newspapers, household waste, but may include corrugated boxes and office waste. Virgin pulps may include mechanical, chemical, or semi-chemical pulps. Enzymes typically include hydrolases such as cellulases, hemicellulases, pectinases, amylases, and lipases such as esterases, lyases such as pectate lyases, and oxidoreductases. Adsorbents include activated bentonite, microparticles, talc, clay and modified silica. Absorbents typically include water soluble polymers, dispersants, coagulatants and agglomerants.

A tissue product containing a multi-layered paper web that has at least one layer formed from a blend of pulp fibers and synthetic fibers is provided. By containing at least one layer of synthetic and pulp fibers, it has been discovered that lint and slough of a tissue product formed according to the present invention can be substantially reduced. In addition, by limiting the amount and layers to which the synthetic fibers are applied, the increase in hydrophobicity and cost of the tissue product may be minimized, while still achieving the desired reduction in lint and slough. In some embodiments, the tendency of the synthetic fibers to sink or float in the fibrous furnish may be minimized to enhance processability by selecting certain types of synthetic fibers, e.g., those with a certain density imbalance.

This invention provides a novel, rapid method and device for determining the relative phase retardation of a multi-layered specimen, which is related to the thicknesses of its layers and walls, and the orientations of its optical axes. An intact wood pulp fibre is a typical multi-layered birefringent specimen. This new method is based on the change of polarization of polarized light that passes through a specimen composed of birefringent layers with different optical axis orientations, such as directions of cellulosic microfibrils oriented differently in various layers of wood fibres. In particular, a novel solution is found to relate the emerging light intensity from an intact wood fibre to the incident light intensity, the wavelength of the light, and the relative phase retardations of various layers and orientations of their cellulosic microfibrils, such as fibril angle, in a circular polarized light system. This new method evaluates the transmitted light intensities of multiple predetermined wavelengths simultaneously to determine the optical and physical properties of a multi-layered specimen being measured. A device for determining the relative phase retardation (retardance) of fibre walls and the fibril angle of intact wood fibres in accordance with the presented invention comprises a light source with well defined multi-wavelengths, an achromatic circular polarized light system, appropriate imaging optics, a multi-channel camera such as a digital color camera that has two or more wavelength (color) detection channels, and an image processing and data analysis system. The measurements take advantage of the birefringence of cellulosic microfibrils, and thus require neither sample preparation nor high resolution optics. Specimen alignment is not required as specimens such as wood fibres are evaluated under circular polarized light. Compared with other methods, this invention is more rapid, accurate, and robust. This method can be automated, and implemented in a fibre flow-through system, thus allowing a rapid assessment of wood pulp fibre properties (on-line in real time).

One embodiment of the present invention is a fibrous structure that may comprise: cellulosic pulp fibers and pretreated cellulosic pulp fibers. The pretreated cellulosic pulp fiber is formed by pretreating cellulosic pulp fiber with a thermoplastic resin having a property selected from the group consisting essentially of water soluble, water dispersible, and combinations thereof.

The present invention discloses a paper-surface gesso plate, which is made of the following components according to weight ratio: 40-50 percent of gesso powder, 0.5-5 percent of active carbon, 0.5-1 percent of corn amylum and 0.4-0.8 percent of paper pulp fibre. Each raw material after being matched together with water is put into a mixer for milling, and then is to be pressed into a mould; the molded gesso plate is to be dried after being cut; the gesso plate after being dried is to be made with the second cut; finally, the products are packed and stored in the warehouse. Because active carbon is added into the gesso plate, by the test and detection in the house decorated with the gesso plate, the result shows that each residual organic volatile brought from the indoor fitment and other decorative materials can be adsorbed effectively; the adsorbing effect is 2-5 times better than that of the gesso plate without added with the active carbon. Besides, the present invention has the long-term and persistent absorption function. The present can avoid the disadvantage to the body health by the deleterious volatile. The manufacturing process is simpler and the social and economical benefits are much greater.

Pulp fibers can be treated with water insoluble chemical additives resulting in a minimal amount of unretained water insoluble chemical additives present after redispersing the treated pulp fibers in the process water. One embodiment of the present invention is a method for preparing chemically treated pulp fiber. A fiber slurry is created comprising process water and pulp fibers. The fiber slurry is transported to a web-forming apparatus of a pulp sheet machine thereby forming a wet fibrous web. The wet fibrous web is dried to a predetermined consistency thereby forming a dried fibrous web. The dried fibrous web is treated with a water insoluble chemical additive thereby forming a chemically treated dried fibrous web containing chemically treated pulp fibers. The chemically treated pulp fibers have an improved level of chemical retention of the water insoluble chemical additive and retain from between about 25 to about 100 percent of the applied amount of the water insoluble chemical additive when the chemically treated pulp fibers are redispersed in water.

A health-care knitting fabric is made up of hemp fibre, color cotton fibre, bamboo fibre, soybean protein fibre, chitin fibre, and natural wooden pulp fibre through twisting, knitting, boiling, softening, baking and high-pressure ironing.

The invention discloses a pulp-grinding method for improving fibre brooming, comprising the following steps: adding rigid filler to the pulp before grinding, and grinding after mixing the rigid filler and the pulp fibre, wherein the additive amount of the rigid filler accounts for 1%-30% of the total mass of the pulp; the rigid filler is any one or the mixture of several types of PCC, GCC, Talc, titanium pigment and bentonite of filler grade; and the rigid filler can also be fibrous mineral fibre. The adoption of the pulp-grinding method can improve devillicate brooming degree of the fibre, improve paper strength and interweaving, or can improve the ash content of paper and reduce fibre consumption under the condition of maintaining a considerable paper strength, and can reduce production cost and reduce the grinding energy consumption while protecting the environment.

Nonwoven textile fabrics in accordance with the present invention are formed primarily of individualized bast fibers substantially free of pectin having a mean length less than 6 millimeters. The nonwoven fabric can include staple fibers and/or pulp fibers. Individualized bast fibers include fibers derived from the flax and hemp plants. The nonwoven textile fabric is formed into a web while in a dry state and subsequently bonded to produce a nonwoven fabric.

The invention discloses an energy-saving enhanced defibrination method for composite pretreatment and production of viscous paper pulp. The method comprises the following steps that (1) paper pulp fibers are dissolved in water, even defibering is carried out, and then pretreatment is carried out; (2) biological enzymes are added to the treated paper pulp for treatment, the dosage of the biological enzymes ranges from 10 IU/g to 60 IU/g, the temperature ranges from 40 degrees to 60 degrees, the pH value ranges from 6 to 9, the concentration of the paper pulp ranges from 3 wt% to 8 wt%, and treatment is carried out for 10 min to 30 min; (3) continuous millstone milling and beating are carried out on the pulp of the step (2), and the pulp is stored for standby application. The method remarkably improves the efficiency of subsequent biological enzyme treatment, and overcomes the defects that enzyme treatment time is too long in biological enzyme assistant defibrination production and energy conservation in defibrination and the physical strength of finished paper formed by fibers cannot be achieved at the same time, the defibrination energy consumption and the defibrination time for producing the viscous paper pulp are saved, the defibrination energy consumption of chemical bleached needle wood pulp and chemithermomechanical pulp of needle wood is reduced by 15%-45%, and the physical properties of finished paper formed by pulp fibers can be improved.

A non-destructive method capable of real-time or on-line measurement of a wood or pulp fiber without sample pretreatment for the microfibril angle and the path difference. A circular polariscope in combination with a line spectral camera generating a micrograph insensitive to the orientation of a fiber and determined only by the fiber's properties related to polarized light. A line image across the fiber is captured and dispersed it into a spectral image to perform a real-time spectral analysis of the fiber's image.

The invention discloses nano modified paper based on surface modification and a preparation method thereof and belongs to the technical field of conductive non-linear insulating paperboards, aiming at solving the problems that nano functional materials in modified paper are partially agglomerated and are not uniformly distributed so that the effect is difficult to exert, and the retention amount is low due to the fact that the nano functional materials are not firmly combined with paper pulp fibers and the like. The product is prepared from liquid-state paper pulp, a modifying agent solvent, a functional group modifying agent and functional fillers. The method comprises the following steps: 1, mixing the modifying agent solvent and the functional group modifying agent; 2, adding the functional fillers; and putting the mixture into a water bath and carrying out ultrasonic treatment; and 3, adding the liquid-state paper pulp; after electrically stirring and uniformly mixing, forming wet paper; and dehydrating in vacuum, hotly pressing, and drying in vacuum to obtain the nano modified paper based on the surface modification. The nano modified paper is applied to insulation in a converter transformer and a wire outlet device. With the adoption of the product disclosed by the invention, an electric field in an oil paper composite insulating structure can be uniformly distributed.

The invention discloses novel complex phase electromagnetic shielding-function paper, which relates to the technical field of specific paper with the electromagnetic shielding function and is prepared by the following steps: non-deinked waste paper pulp fiber is used as matrices, carbon fiber and carbon black are dispersed among the fiber, the carbon fiber is modified through coupling agents at first, and then modified carbon fiber as surfactants is added. Compared with the traditional relevant shielding-function paper, the novel complex phase electromagnetic shielding-function paper replaces fresh pulp or resin and the like by office waste paper, conforms to the requirements of waste regeneration and reutilization, low carbon, energy saving and environment protection, does not need deinking work procedures, reserves effective electric conducting ingredients of carbon black in ink, simplifies the production process and greatly reduces the production cost. The hydrophilicity of the carbon fiber is improved through couple modification treatment, then, the dispersivity of the carbon fiber and the pulp fiber is improved through surfactants such as Tween-80 and the like, and the long-range and short-range cooperative electric conducting effect of three-dimensional networks is improved through carbon black filling. Through tests, the prepared finished paper has the advantages of high strength, low electric resistivity, low reflection, high wide-frequency absorption, low quantitative quantity, wide softness adaptability and the like.

The present invention discloses a waterproof and damp-proof raw paper dedicated for electronic paper tapes, and a preparation method thereof. The method is characterized in that untwining and fibrillation are carried out on pulp fibers, fibrillation and cutting are further carried out so as to enable a pulp beating degree to reach 45 degree SR to 48 degree SR and a fiber wet weight to be reduced to 5.5 g to 8.0 g; and a water-resistant damp-proof composition is added in each layer, 1.0%-2.5% of the water-resistant damp-proof composition is added in relative to 100 parts of the pulp fibers, the water-resistant damp-proof composition including 0.15+-0.015 % of a wet strength agent PAE, 0.50+-0.05 % of gum rosin or an alkyl ketene dimer (AKD), 0.10+-0.01 % of silicon and fluorine type polymers, and 0.15+-0.015 % of ammonium zirconium carbonate. According to the above method, defibrination treatment is utilized, and a water-resistant damp-proof functional chemical is added in the pulp and coated on the surface of paper, surface water absorption and an edge permeation index of the raw paper are lowered than like products on the market, and water-resistance and damp-proofness of the raw paper are the best.

The invention relates to a modifying method of a plant paper pulp fiber modifying, and filter paper and a preparation method thereof, belonging to the fields of modification of plant paper pulp fiber and preparation of filter paper. The invention aims to solve the problem of failure to implement modification of plant paper pulp fiber since no plant paper pulp fiber modifying agent and modifying method exist in the prior art, and the problem of high cost in the prepared filter paper in the prior art, or that the prepared filter paper can not have small pore size on the premise of ensuring high air permeability. The plant paper pulp fiber modifying method comprises the following steps: 1. preparing the modifying agent; and 2. modifying. The filter paper is prepared from the following components in parts by weight: 15-45 parts of plant paper pulp fiber modified sulfate softwood pulp, 5-15 parts of sulfate hardwood pulp and 45-75 parts of plant paper pulp fiber modified mercerized sulfate softwood pulp. The invention is used for modifying plant paper pulp fiber and preparing filter paper.

The invention relates to the technical field of processing of papermaking waste residues, in particular to a method for recycling papermaking waste residues. The method for recycling the papermaking waste residues comprises the processing steps of impurity removal, smashing, washing slag separation and recycling and filtering, wherein the impurity removal is performed to remove metal in the papermaking waste residues, the impurity-removed papermaking waste residues are put into a smashing machine in the smashing step to enable the papermaking waste residues to be smashed completely, a sorting pool is utilized to classify and recycle materials in the papermaking waste residues in the step of washing slag separation and recycling, and papermaking waste water produced after the separation and recycling is filtered to recycle paper pulp fiber. By means of the method for recycling the papermaking waste residues, more than 40% of materials in the waste residues can be recycled, the recycle rate of the materials in the papermaking waste residues is high, and the method has the advantages of being simple and mature in process and low in device cost and production cost and facilitating large-scale general popularization and application.

The invention relates to a compound function type bamboo pulp fibre prepared by taking white bamboo charcoal as a functional material and a preparation method thereof. In the prepared compound function type bamboo pulp fiber, the fiber content is as follows: absolute dried fiber content is 85-93% in terms of weight, the balance water and impurities remained in the fiber production process like water, oil, etc. In the invention, the fiber far-infrared emissivity is more than 82%, the anion concentration is over 2000/cm<3>, the sterilizing value is larger than 0.3, and the bacteriostatic value is larger than 2.0, thus preserving the excellent performance of bamboo pulp fiber such as hygroscopicity and permeability, softness and smoothness, antibiosis and the like and creating a new field for developing functional fiber.

A water writing paper simulating the Xuan paper is composed of black base paper and coated white layer, and is prepared through making black base paper, preparing white paint and coating. Said black base paper contains pulp fibres, black pigment, adhesive, acid salt, dry strnegthening agent, and wet strengthening agent. Said white paint paint contains white pigment, disperser, adhesive (butadiene-styrene or propadiene styrene emulsion and PVA), cross-linking agent and regulator. Its advantages are low cost, clear tracing and cyclic use.