732results about "Pulp beating/refining methods" patented technology

Disclosed are non-wood pulps having a fiber length greater than about 1.70 mm and a brightness of about 80% or greater. The relatively high degree of brightness is achieved without a loss fiber length or pulp yield. The high degree of brightness and relatively long fiber length makes the pulps well suited for the manufacture of wet-laid fibrous products, particularly wet-laid tissue products. The pulps may be prepared from plants of the family Asparagaceae by mechanical pulping and more preferably by a chemi-mechanical pulping using a sodium hydroxide alkaline peroxide solution where the primary pulp is cleaned to reduce debris prior to bleaching. Preferably the cleaned primary pulp has less than about 5% debris prior to bleaching.

According to an example aspect of the present invention, there is provided a method comprising: providing a pulp composition; screening the pulp composition to obtain an accept fraction and a reject fraction; and dewatering the accept fraction output from the screening by a screw press.

Provided is a method for producing a refiner segment for refining lignocellulosic material. The method is suitable for rebuilding a refiner segment out of a worn refiner segment. The method includes providing a refiner segment workpiece; supplying rebuilding production data of a refining portion to a control device of an additive manufacturing device; and 3D printing the refining portion on the refiner segment workpiece by using the rebuilding production data. The worn refiner segments represent a substantial value and by re-using the used refiner segments the expensive process of melting them down and casting them again can be avoided.

The utility model discloses a paper pulp refiner, which relates to the technical field of paper pulp preparation and comprises a refiner body, the refiner body is composed of a grinding box, a channel pipe, a storage box and a discharge pipe, and the grinding box is communicated with the storage box through the channel pipe. When the grinding roller is located at the highest position, the distance between the grinding roller and the cavity of the grinding box is the largest, paper pulp is coarsely ground firstly, the coarsely ground paper pulp falls into the storage box and is pumped back into the grinding box through the circulating pump to be continuously ground, and after the paper pulp is coarsely ground completely, the height of the grinding roller is lowered, so that the grinding efficiency is improved. When the grinding roller is located at the lowest position, paper pulp subjected to coarse grinding is subjected to fine grinding through the grinding roller, qualified paper pulp after fine grinding flows out through the through hole and the discharging pipe, large paper pulp continues to be ground circularly, the problem that a traditional pulping machine is uneven in grinding is solved, repeated inspection and repeated pouring into the pulping machine for re-grinding are not needed, and the pulping efficiency is improved.

The utility model relates to the technical field of papermaking equipment, and discloses an environment-friendly and energy-saving papermaking pulping machine which comprises a base, a bearing disc is fixedly connected to the top of the base, a pulping barrel is fixedly connected to the middle of the top of the bearing disc, a supporting frame is fixedly connected to the periphery of the top of the bearing disc, and a lifting rotating mechanism is arranged on the inner side of the supporting frame. An adjusting mechanism is arranged in the pulping barrel, a pulping device is arranged at the top of the adjusting mechanism, the lifting and rotating mechanism comprises a lifting assembly and a rotating assembly, the lifting assembly is arranged on the inner side of the supporting frame, the rotating assembly is arranged at the bottom of the lifting assembly, and the lifting assembly comprises a first motor; the first motor is fixedly connected to the top of the supporting frame. The threaded rod can drive the lifting frame to drive the fixing frame to move downwards, the fixing frame can drive the first pulping disc to move downwards, the second motor drives the rotating shaft to rotate along with the first pulping disc, and the first pulping disc can conduct pulping on papermaking raw materials in the pulping barrel.

The invention discloses an chemi-mechanical pulp production method capable of improving the filtration property of chemi-mechanical pulp, and relates to the technical field of papermaking, high-concentration grinding freeness is optimized to 640 + / -30ml, pulp fine fibers can be controlled at 22%-33%, the tensile index middle-lower limit and the bulk middle-upper limit, the high-concentration grinding effect is improved, the effect between fibers is facilitated, the effect between the fibers and a grinding sheet is reduced, and the filtration property of the chemi-mechanical pulp is improved. Fiber cutting is reduced, and the content of pulp fine fibers is reduced; the MSD torque is increased to 250 + / -10 KNM, the tearing effect of wood chips is improved, the preimpregnation reaction of the wood chips is facilitated, the original fine content is controlled to 26%-29% from original 22%-33%, the pulp bulk is increased by about 0.1 cm < 3 > / g, and the tensile index is increased by 1.0 N.m / g; the four low-concentration grinders are changed into parallel connection, so that the residence time of pulp in the low-concentration grinders is prolonged, the cutting effect of the pulp ground by the low-concentration grinders on fibers is reduced, light friction between grinding sheets and the fibers is increased, fibrillation of the fibers is facilitated, the bulk and the tensile strength are improved to a certain extent, and under the content of fine fibers, the size of the fibers is reduced. And the bulkiness and the tensile index of the finished pulp are also improved to a certain extent.

The invention discloses nano cellulose with high lignin content, a preparation method thereof and application of a barrier coating. The preparation method comprises the following steps: mixing a lignocellulose raw material with dilute sulphuric acid for acid pretreatment, and selectively depolymerizing hemicellulose to obtain lignin-rich residues of which the relative content of lignin is higher than that of the raw material; and carrying out mechanical nano fibrillation treatment to obtain the high-lignin-content nano cellulose with the lignin content of 29-60%. The prepared nano cellulose with high lignin content has excellent thermal stability, hydrophobicity and organic compatibility. The surface of paper is coated with the coating material, after hot pressing treatment, the Cobb value of the coated paper is as low as 3.3 g / m < 2 >, the water vapor permeability is only 12.1 g / (m < 2 >. D), grease permeation can be completely blocked, and the coating material has wide application prospects in the field of food packaging.

The invention provides kenaf whole stalk APMP pulp and a preparation method thereof.The preparation method comprises the specific steps that S1, air-dried kenaf whole stalks are cut into strips, washing and impurity removing are conducted, and a material a is obtained; s2, carrying out pre-steaming treatment on the material a, and extruding and defibering the steamed material to obtain a material b; s3, adding the material b into the pre-impregnation liquid for impregnation to form slurry, and performing centrifugal dewatering on the slurry until the concentration is 20-30wt% to obtain slurry a; s4, grinding the pulp a to form high-concentration ground pulp, adding the high-concentration ground pulp into the adjusting liquid a, bleaching, and centrifugally dewatering until the concentration is 20-30wt% to obtain pulp b; s5, the pulp b is added into the adjusting liquid b for second-stage bleaching and centrifugal dewatering till the concentration is 20-30 wt%, pulp c is formed, the pulp c is diluted and ground, cleaning and screening are conducted after grinding is completed, and the kenaf whole stalk APMP pulp is obtained. The kenaf whole stalk APMP pulp has good pulp characteristics, the dependence of traditional APMP pulping on wood is broken through, and the current situation that domestic pulping wood resources are deficient is relieved.

The invention discloses a preparation method of degradable seedling raising paper with zero quantification of VOCs (volatile organic compounds). The preparation method comprises the following operation steps: S1, raw material selection: fiber raw materials comprise 75-85% by mass of typha angustifolia and 15-25% by mass of reeds; s2, the fiber raw materials in S1 are subjected to the following procedures in sequence; the preparation method comprises the following steps: preparing typha angustifolia and reeds, stewing in a vertical pot, sealing and screening, washing pulp, carrying out oxygen delignification, concentrating the pulp, preparing unbleached chemical straw pulp, preparing into a pulp storage tower, preparing into a pulp extruding machine, carrying out high-concentration grinding, preparing into a latency tank, preparing into a conical pulping machine, preparing into a pulp preparing tank, preparing into a pulp forming tank, desanding, screening, forming on a net, squeezing, pre-drying, carrying out surface sizing, post-drying and calendering. The seedling raising paper meeting the requirements of ecological agricultural paper is prepared. The seedling raising paper obtained by the invention has good paper air permeability and high dry and wet strength, has weather resistance of wind and rain wash resistance and treading resistance, can realize natural degradation of microorganisms in soil, has the characteristics of zero quantity of VOCs (Volatile Organic Compounds) degradability and sustainable circulation of all raw materials, and is green, environment-friendly and pollution-free to soil.

The invention relates to a preparation method and application of para-aramid pulp, and the preparation method comprises the following steps: (1) mixing para-aramid resin with a first amide solvent, a cosolvent, a solubilizer and a catalyst to obtain a para-aramid polymer solution; and (2) mixing the para-aramid high polymer solution obtained in the step (1) with a precipitation agent, and carrying out precipitation, shearing and cooling molding to obtain the para-aramid pulp. The preparation method provided by the invention is simple in process flow and low in investment cost, and the obtained para-aramid pulp has the advantages of high specific surface area, good morphology and the like, can be applied to the field of high-performance reinforcing materials such as aramid paper and the like, and remarkably improves the strength and tearing property of the materials.

The invention belongs to the technical field of mineral flotation, and particularly relates to a cellulose-based coal slime collecting agent and a preparation method and application thereof. The method comprises the following steps: performing wet grinding on recycled waste paper to obtain a paper pulp solution, stirring until paper pulp fibers are uniformly dispersed, adding excessive lithium chloride and sodium periodate, performing stirring reaction, cleaning and centrifuging to obtain precursor cellulose, performing amino alkylation modification to obtain amino alkyl cellulose, preparing the amino alkyl cellulose into a 20 g / L solution, and performing vacuum drying to obtain the lithium ion battery cathode material. And then uniformly mixing with non-polar hydrocarbon oil according to the volume ratio of 1: 2 to obtain the coal slime collecting agent. The prepared coal slime collecting agent contains the hydrophobic nanocellulose with the large length-diameter ratio, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The utility model discloses a refined cotton pulping device, which is characterized in that a central island seat is fixedly arranged at the center of a pulping pool, an annular pulp groove is formed in the pulping pool, a pulp inlet pipe and a water inlet pipe are respectively communicated with the front side of the pulping pool, and paired first motors are respectively and fixedly arranged on the outer wall of one side of the pulping pool; the paired first lead screws are rotationally installed on the outer wall of one side of the pulping pool through rod bases respectively, the lower ends of the paired first lead screws are in transmission connection with the paired first motors respectively, threaded holes corresponding to the paired first lead screws are formed in the base, and the base is in threaded transmission connection with the paired first lead screws through the threaded holes respectively. The beating device has the advantages that pulp floating on the water surface can be quickly beaten by the aid of the beating roller, part of clustered pulp can be effectively loosened, and the beating effect is good.

The present invention provides a process for producing paper or board, comprising slushing a stock of dried fibres in a slushing system comprising a pulper, and / or feeding a stock of never-dried fibres in a fiber line of an integrated paper mill; deflaking and / or refining the stock in a deflaker and / or a refiner, optionally diluting the deflaked and / or refined stock, directing the deflaked and / or refined stock to a headbox, forming a web, and drying the web, wherein a polymeric paper making additive is added to one or more of the stocks of dried fibres and never-dried fibres before deflaking and / or refining of the stock. The present invention further provides paper and board with improved properties.

A liquid crystal polymer powder that contains fibrous particles including a liquid crystal polymer, and the melt viscosity of the liquid crystal polymer powder is 15 to 77 Pa·s.

The invention discloses a high-strength wood nanocellulose membrane and a preparation method thereof, and belongs to the technical field of nanocellulose membranes. The preparation method provided by the invention comprises the following steps: carrying out heating treatment on biomass straws by using alkali liquor with the concentration of 6-10wt%, washing and neutralizing, then adding cellulase for enzymolysis, and carrying out mechanical pulping after inactivation, so as to obtain wheat straw biochemical mechanical pulp; defibering and screening the wheat straw biochemical mechanical pulp to obtain fine fibers, performing ultra-fine particle grinding on the fine fibers to obtain a lignin-containing nanocellulose dispersion liquid, and performing vacuum filtration and drying to obtain the lignin-containing nanocellulose composite material. The preparation process is mild in reaction condition and low in production cost, the obtained nanocellulose membrane has high mechanical strength, and the maximum breaking stress can reach 100 MPa.

The invention belongs to the technical field of pulping and papermaking, and particularly discloses a method for preparing chemimechanical pulp by dipping bamboo reed in hot alkali and a method for constructing a model of the chemimechanical pulp, and the method comprises the following steps: putting absolutely dry raw materials of the bamboo reed into a sealing bag, adding water, sealing, and carrying out high-pressure sterilization; the method comprises the following steps: carrying out extrusion defibering and hot alkali dipping on the gold arundo donax subjected to high-pressure sterilization, and then collecting a treatment solution, in the hot alkali dipping process, alkali in hot alkali liquor is NaOH, in terms of Na2O, the use amount of the alkali is 4-8%, the temperature is 90-100 DEG C, and the dipping time is 30-60 minutes; carrying out segmented pulp grinding on the residual solid; and washing the ground pulp, heating for latency elimination, screening to obtain fine pulp, and pulping to obtain the product. After appropriate hot alkali dipping, paper made of the golden reed chemimechanical pulp can be comparable with wheat straw chemimechanical pulp paper in physical performance.

The invention discloses an energy-saving pulping method based on pretreatment strengthening and segmented enzyme activation, and belongs to the technical field of pulping and papermaking. According to the pulping method provided by the invention, p-toluenesulfonic acid is added in pretreatment to adjust pH and strengthen enzyme activity, and enzyme is wrapped by using a temperature or pH response type carrier, so that pectinase, cellulase and laccase can be controlled to be released and activated in a proper treatment stage. By accurately controlling the enzyme action sequence, substrate competition is avoided, enzyme inactivation is reduced, the enzymolysis efficiency and the utilization rate are effectively improved, and the COD content of wastewater is reduced; and two-stage pulping and p-toluenesulfonic acid are combined to soften fibers synergistically, so that the power consumption per ton of pulp is reduced. According to the invention, fiber fibrillation is promoted through enzyme treatment, and the tensile strength and the water retention value are effectively improved; the laccase catalyzes crosslinking of lignin, so that the wet strength is remarkably improved. The paper pulp provided by the invention gives consideration to physical properties and environmental protection requirements of high-strength packaging paper manufacturing, and has a wide application prospect.

The invention discloses high-strength high-air-permeability germinable seed paper and a preparation method thereof, and belongs to the technical field of seed paper preparation. The technical problem that the water absorption and air permeability of traditional seed paper are reduced due to addition of a chemical reinforcing agent, and then the germination rate of seeds is affected is solved. According to the technical scheme, unbleached softwood pulp is used as a raw material, after being pulped by a PFI mill, the unbleached softwood pulp is mixed with cationic lignocellulose nanofibrils and seeds which account for 4-8% of the mass of absolute dry pulp for pulping, forming is conducted through an automatic paper making system of a Kaiser method, and drying and shaping are conducted at the temperature of 40 DEG C; the cationic lignocellulose nanofibrils are prepared by the steps of grinding unbleached softwood pulp, performing alkali treatment, performing etherification reaction and performing ultrahigh-pressure homogenization. The seed paper does not need a chemical reinforcing agent, the air permeability is 17.4-18.8 [mu] m / (Pa.S), the tensile strength is 6.08-6.84 kN / m, and the relative absorptivity is 214-230%.

The invention relates to a method for producing a wood fiber material (32), comprising the steps of providing fiber material (30), burning a fuel (24) in a furnace (16) so that exhaust gas (27) is produced, drying fiber material (30) in a dryer (28) using the exhaust gas (27) so that dried fiber material (32) and vapors (34) are produced, and discharging vapors (34) into the environment (44), comprising the step of returning a portion of the vapors (34) to the furnace (16) so that volatile organic substances contained in the returned vapors (34) are burned.

The invention discloses a preparation method of degradable napkin based on natural plant fibers, and relates to the field of hygienic products. According to the preparation method of the degradable napkin based on the natural plant fibers, natural cellulose raw materials such as the sisal hemp waste residues and the banana stalks are adopted, the source is wide, and the cost is low. Raw materials are cleaned, crushed and degummed to prepare crude fiber bundles, and the crude fiber bundles are converted into soft microfibrillated cellulose colloid through enzyme treatment. Defibering part of the colloid into long-fiber matrix pulp, homogenizing the other part of the colloid at high pressure to prepare short-fiber reinforced pulp, mixing the long-fiber matrix pulp and the short-fiber reinforced pulp to obtain reinforced pulp, and performing papermaking, drying and calendering to prepare the raw paper. According to the process, through fiber softening treatment, the softness and hand feeling of the paper are remarkably improved while the toughness is kept, and the process is suitable for napkin production. A green biotechnology is adopted in the whole process, the pollution load is low, chemicals are biodegradable, and the requirements for low cost and environmental protection are met.

The invention discloses a carbon fiber paper-based material and a continuous calendering enhancement method thereof. The preparation method specifically comprises the following steps: repulping, grinding, defibering and sieving meta-aramid pulp, and then mixing with defibered and dispersed short carbon fibers to prepare paper pulp; sequentially carrying out forming, dewatering, squeezing and drying treatment on the slurry to obtain a carbon fiber base paper coiled material; and carrying out continuous calendaring enhancement treatment on the carbon fiber raw paper coiled material to obtain the carbon fiber paper. According to the method, the purpose that the temperature is higher than the glass transition temperature (larger than or equal to 273 DEG C) of the meta-aramid pulp can be achieved, the purpose of conducting hot pressing on the carbon fiber base paper can be achieved, the large-batch and continuous production requirements of the carbon fiber paper can be met, and the production efficiency is greatly improved.

The present invention relates to the technical field of papermaking equipment, and specifically relates to a refiner for pulp manufacturing and a refining method thereof. The refiner body includes an outer grinding cylinder mechanism and a liquid storage tank. A braking structure is arranged inside the liquid storage tank, and an inner grinding ball driving motor is arranged inside the braking structure. The output end of the inner grinding ball driving motor is connected to an inner grinding ball structure, and the inner grinding ball structure is arranged inside the outer grinding cylinder mechanism. A driving ring is arranged on the outer side of the outer grinding cylinder mechanism, a driven gear is arranged inside the driving ring, a transmission rod is connected to the driven gear, and the transmission rod is connected to a double-output shaft motor. In the present invention, the pulp enters between the outer grinding cylinder mechanism and the inner grinding ball structure after being pre-stirred by a stirring tank. Through the relative rotation of the outer grinding cylinder mechanism and the inner grinding ball structure, the pulp can be vertically ground. Therefore, due to the action of gravity, even if there are impurities such as fibers in the pulp, they will not adhere to the grinding disc and will not cause blockage of the refiner, greatly improving the efficiency of pulp refining.

A defibering and deflaking pulper has a defibering rotor-stator pair and a deflaking rotor-stator pair for processing a fiber-based material into smaller pieces. The defibering and deflaking pulper creates an impeller-produced vortical circulation that pulls the material through a defibering rotor-stator interface, where the material is broken down into smaller pieces, and then through a deflaking rotor-stator interface, where the smaller pieces are broken down into even smaller pieces. The defibering and deflaking pulper accumulates the defibered and deflaked material that passes through the defibering rotor-stator interface and the deflaking rotor-stator interface for further processing. This combination of defibering and deflaking in the defibering and deflaking pulper reduces plugging from larger pieces of the material and reduces downstream processing of the material, thus increasing productivity and reducing costs.

The application discloses a kind of aerodynamic feed dual-disc refiner, including machine body, casing, machine cover, rotating disc, fixed disc, casing is connected with machine body, machine cover, inlet two, discharge port are equipped on casing, fixed disc includes fixed disc one, fixed disc two, spring return device includes spring return device one, spring return device two, fixed disc one is connected with spring return device one, fixed disc two is connected with spring return device two, spring return device one is connected with machine cover, spring return device two is connected with casing, casing and machine cover form airtight refiner chamber, rotating disc is connected with main shaft, machine cover is equipped with air inlet one, drain one, casing is equipped with air inlet two, drain two, fixed disc one and machine cover form air chamber one, fixed disc two and casing form air chamber two, air chamber one, air chamber two are connected with gas source, the present application pressure and pulp pressure self-balancing ensure that the gap of two sides of grinding piece is consistent, force is same, output pulp beating degree is consistent, pulp quality is good, prolongs the service life of grinding piece, reduces use cost.

A method of refining dense pulp comprising the steps of prearranging a stator (10) having a perforated side wall (11), prearranging a rotor (20) rotatable in the stator (10), said rotor (20) comprising a plurality of blades (21) having respective cutting profiles (22) arranged at a distance d from the perforated side wall (11), said rotor arranged to be rotated at a peripheral speed v of the cutting profiles (22) with respect to the stator (10). The method then comprises the steps of prearranging in the stator (10) an inlet duct (15) and prearranging externally to the stator (10) a collection chamber (30) having an outlet duct (31). The method also comprises a step of feeding into the stator (10), through the inlet duct (15), selected pulp previously subjected to separation from solid parts, so that the blades (21) cause the forced passage of the selected pulp between the cutting profiles (22) of the blades (21) and the perforated side wall (11), causing a refining action of the selected pulp, and so that refined fibers pass through the perforated side wall (11) and reach the collection chamber (30) and the outlet duct (31).

The present invention belongs to the technical field of bamboo fiber brooming devices, and in particular to a bamboo pulp fiber brooming device. In view of the existing bamboo pulp fiber brooming devices, in the process of using a hot mill to perform bamboo fiber brooming and pulping treatment, workers are often used to manually convey bamboo to the device. This feeding method cannot effectively control the average conveying amount of raw materials, resulting in low brooming efficiency of the bamboo pulp fiber by the brooming device. Now, the following scheme is proposed, including a hot mill, wherein a grinding chamber is provided on the hot mill, and a conveying pipe is provided on the side of the grinding chamber away from the hot mill, a spiral push rod is provided in the conveying pipe, and a driving motor is provided on the side of the conveying pipe away from the hot mill. A bamboo pulp fiber brooming device disclosed in the present invention can effectively realize the quantitative delivery of raw materials, avoid the instability of manual delivery of raw materials, match the raw material delivery capacity of the device with the processing capacity, and ensure the efficiency and output of the device.

The utility model relates to the technical field of specialty paper production, and discloses a specialty paper efficient pulping device which comprises a supporting seat, the inner wall of the supporting seat is fixedly connected with a stirring barrel, the top end of the stirring barrel is fixedly connected with a protection box, the right end of the protection box is fixedly connected with a first motor, and the driving end of the first motor penetrates through the protection box. The first motor is connected with a rotating rod and a rotating ring through a gear assembly, a plurality of first stirring plates are fixedly connected to the outer wall of the rotating rod, a plurality of fixing plates are fixedly connected to the four corners of the outer wall of the rotating ring, and fixing rods are fixedly connected to the bottom ends of the fixing plates. According to the paper pulp stirring device, the first motor, the first bevel gear, the second bevel gear, the rotating rod, the first stirring plate, the third bevel gear, the rotating ring and the fixing plate are arranged, and the fixing rod and the second stirring plate are matched, so that raw materials and water are fully mixed, and the uniformity of paper pulp is improved.

According to an exemplary embodiment of the present invention, a method is provided that includes providing a pulp composition, screening the pulp composition to obtain an accept fraction and a reject fraction, and dewatering the accept fraction output from the screening by a screw press.

The utility model discloses a broken paper disc mill switching management system which comprises a broken paper disc mill workshop and a core pulp disc mill workshop, two broken paper grinding discs are arranged in the broken paper disc mill workshop, and a broken paper feeding control valve for controlling feeding on-off is arranged on a feeding pipeline of each broken paper grinding disc. A first switching control valve and a second switching control valve are respectively connected between the feeding pipelines and the discharging pipelines of the two broken paper grinding discs through pipelines; a core pulp disc mill is arranged in the core pulp disc mill workshop, and a branch material distributing pipeline and a branch material returning pipeline which are used for conveying broke pulp to a disc mill at a material inlet and a material outlet of the core pulp disc mill when one of the two broke millstones is maintained are connected in series on a pipeline between the first switching control valve and the second switching control valve in a branch manner; a third switching control valve is connected between the branch material distributing pipeline and the branch material returning pipeline through a pipeline; through the control valve, switching replacement between the broken paper disc mill and the core pulp disc mill in broken paper processing is achieved.

The invention relates to a milling element (2) for a refiner. Milling strips (21) are arranged on a base plate (18) of the milling element (2). Adjacent milling strips (21) form grooves (22) extending between the milling strips (21). A hydraulic capacity is provided by the open area of the grooves in the peripheral direction. The height of the milling strips above the base plate (18) decreases from radially inwards to radially outwards, wherein, at a predetermined partial height, the open area of the grooves at the partial height at the inner radius approximately corresponds to the open area of the grooves at the partial height at the outer radius. The partial height is obtained by shortening all milling strips (21) by a predetermined amount (27).