77results about "Raw material pretreatment" patented technology

The invention relates to the technical field of high polymer material production, and discloses a digesting and mincing device for waste paperboard recycling, which comprises a supporting foot stool, the top end of the supporting foot stool is connected with a protective shell, a stirring cylinder is rotatably arranged in the protective shell, a crushing cylinder is rotatably arranged in the stirring cylinder, and a crushing device is arranged in the crushing cylinder. A double-layer filter screen is arranged on the surface of the stirring barrel, and a first sealing bearing is connected between one side of the double-layer filter screen and the protective shell. According to the invention, rotation of the stirring cylinder, rotation of the crushing cylinder and action time sequence of each component are respectively controlled, so that the waste paperboard processing requirements of different batches and different states can be flexibly adapted, accurate control of digestion time, stirring strength, crushing strength and cleaning process is realized, and adaptability and controllability of the process are enhanced.

This invention provides a biomass pretreatment method using a steam-coupling twin-screw extruder, along with cellulose-containing biomass and its applications. The biomass pretreatment method includes the following steps: sequentially subjecting pre-softened biomass raw materials to steam treatment and twin-screw extrusion crushing to obtain biomass particles; the biomass particles are then subjected to a cooking reaction to obtain cellulose-containing biomass. This invention utilizes the synergistic effect of steaming and twin-screw extrusion crushing to overcome the mass transfer resistance of dense wood with low energy consumption, aiming to solve the problems of dense forest biomass structure, high energy consumption in traditional pretreatment methods, and difficulty in chemical penetration. This process can effectively reduce the amount of chemicals used to achieve efficient and directional separation of components, fully adapting to the needs of low-cost, continuous industrial production.

The application discloses a preparation method of light fireproof sound-absorbing fiberboard and relates to the technical field of fiberboard materials.The method comprises the following steps: washing, cooking, hot grinding, adding black dye, adding a fire retardant, adding azodicarbonamide as an additive, spraying, hot pressing, and sawing.The temperature of the spraying is controlled within 100-110 DEG C, and the spraying amount is controlled within 30-50 kg / h.The fiberboard prepared by the method has a single-layer structure, has good sound-absorbing effect, does not need to be matched with sound-absorbing materials, can be thinnest to 9 mm, reaches the national fireproof B1-B level standard, and can reduce the density of the board to 600-700 kg / m 3 , so as to achieve the purpose of lightening.

According to the straw blank deslagging device for the Chinese art paper, the plate surfaces of two side plates are vertically arranged, the plate surfaces of the two side plates are oppositely arranged in parallel, the periphery of a screen is in a square shape matched with the space defined by the two side plates, and the plate edge, located on the side where the side plates are located, of the screen is arranged in the middle of the vertical direction of the side plates at the same height; the plate edge, perpendicular to the side plate, of the screen is located at the vertically-arranged plate edge of the side plate, a belt is arranged at the position of an upper opening defined by the side plate, a material stirring rod or plate is arranged on the belt, the belt is wound around the power roller and the reversing roller, and the belt face of the belt and the plate face of the screen are integrally arranged in parallel. When the belt moves, the material stirring rod or plate stirs the straw so as to remove ash on the straw, manpower is saved, and the rice paper production efficiency is improved.

A method (100) for processing fibrous matter from a waste material involves obtaining (101) the waste material, trimming (102) the waste material, pre-treating (104), second mechanical treatment (106), washing (108), first chemical treatment (110) with an enzyme and water solution, draining (112) the enzyme and water solution, heating (114) to obtain a fiber cake, providing (116) controlled shockwaves, a second chemical treatment (118), hydro-extracting (120) fiber cake, opening (122) the fiber cake, drying (124), pre-conditioning and softening (126), mechanically treating and segregating (128), softening (129), processing (130) to obtain a sliver and spinning (132) the sliver to obtain a product.

The utility model provides a raw material cleaning device for paper production, which relates to the technical field of paper production and comprises a cleaning box, a filter screen plate with a notch on one side is arranged in the cleaning box, and a guide component is arranged between the cleaning box and the filter screen plate. A lifting part is arranged on the side wall of the cleaning box and on the side away from the notch end of the filter screen plate, a rotating motor operates to drive a gear to rotate, a rack is driven to slide and ascend and descend in a dustproof shell, the rack pushes the filter screen plate to ascend and descend, and raw materials placed in the filter screen plate are lifted or sunk. Cleaning liquid in the cleaning box is heated through the heating plate, raw material separation and softening are accelerated, a worker can pick out the raw materials from one side of a notch of the filter screen plate when the filter screen plate is lifted, physical exhaustion can be reduced, and the raw materials are treated in one step.

The invention relates to a portable efficient separation tool for a core roll paper core pipe. The portable efficient separation tool comprises a square base, an iron column and an annular ring. The iron column is vertically fixed on the square base; the annular ring is fixedly arranged on the iron column and located at the position, 5-6 cm away from the square base, of the iron column. The problems that core base paper of core roll degraded paper-making paper is difficult to separate, the manual stripping efficiency is low, and the labor intensity is high are solved.

A method for processing a bark press water from sawmills and / or pulp mills is disclosed. According to the disclosure, the method comprisesa) filtration of the bark press water to provide a bark press water filtrate having a particle size of less than 100 μm, and b) concentrating the bark press water filtrate to a level of at least 10% dry weight and thereby providing a first fraction of concentrated bark press water, comprising tannic compounds; and a second fraction of purified bark press water.

The invention discloses a lignocellulose continuous multi-stage steam explosion pretreatment process and device, and relates to the technical field of lignocellulose raw material pretreatment. Comprising the following steps: continuously conveying lignocellulose loaded with a chemical additive into a steam explosion pretreatment reaction tube, carrying out continuous three-stage low-temperature reaction coupling high-pressure explosion treatment, and spraying to obtain a pretreated lignocellulose material; wherein the specific parameters of the continuous three-stage low-temperature reaction coupling high-pressure blasting treatment are as follows: the treatment is performed for 5-9 minutes at the temperature of 80-120 DEG C in the first-stage treatment, the treatment is performed for 2-6 minutes at the temperature of 140-160 DEG C in the second-stage treatment, and the treatment is performed for 1-3 minutes at the temperature of 180-220 DEG C in the third-stage treatment; the pressure is 0.5 to 2.0 MPa. According to the continuous steam explosion lignocellulose complete equipment and the pretreatment method, effective continuous production of biomass raw materials can be achieved, low-inhibitor lignocellulose hydrolysis sugar liquid is obtained, fermentation conversion of downstream microorganisms is facilitated, wastewater discharge and use of chemical auxiliaries are reduced, and commercialized large-scale production is expected to be further achieved.

The utility model relates to the technical field of filter paper processing, and one embodiment of the utility model provides a pulper for high-infiltration-rate environment-friendly filter paper production, the pulper comprises a pulping barrel, a feeding cover is arranged at the upper end of the pulping barrel, a pulping monitoring assembly is arranged in the pulping barrel, and a driving discharging assembly is arranged on the lower end face of the pulping barrel; the repulping monitoring assembly comprises a motor table, a stress sleeve is arranged at the detection end of the thrust sensor, and the stress sleeve is located on the side wall of the repulping rod. By means of the technical scheme, the problems that in the prior art, a traditional pulper mostly adopts a single stirring structure, raw materials are impacted and crushed through high-speed rotating blades, but for long-fiber raw materials needed by high-infiltration-rate filter paper, the equipment is prone to fiber breakage due to excessive shearing, the brooming rate of pulp is reduced, and the production cost is lowered are solved. Meanwhile, the repulping process lacks a real-time monitoring mechanism, repulping parameters are difficult to dynamically adjust according to the characteristics of raw materials, and the repulping quality stability is poor.

A method for processing a lignocellulose biomass material with a moisture content below 10 weight-% and an ash content below 1.0 weight-% includes: adding an acid catalyst to the lignocellulose biomass material; after adding the acid catalyst, thermally treating the lignocellulose biomass material with steam at an elevated pressure and an elevated temperature in at least one reactor; discharging the lignocellulose biomass material and blow steam from the at least one reactor using a steam explosion discharge device; and forming pellets and / or briquettes from at least part of the discharged thermally treated lignocellulose biomass material.

The application discloses a method for improving the drainage of cotton stalk chemi-mechanical pulp, and belongs to the field of pulping and papermaking. The method comprises the following steps: after the cotton stalk is crushed, washed and steamed, a first chemical impregnation agent is added, and then mechanical disintegration is performed to obtain cotton stalk material; pectinase is used to perform enzyme pretreatment on the cotton stalk material to obtain pretreated material; a second chemical impregnation agent is added to the pretreated material, mechanical disintegration is performed, and then refining disintegration is performed to obtain refined material; after the refined material is washed, enzyme treatment is performed on the refined material by using pectinase to obtain cotton stalk chemi-mechanical pulp with obviously improved drainage. By selecting pectinase as a biological enzyme and designing a two-stage treatment process of pectinase, pectin substances in cotton stalk raw materials can be effectively removed, pectin is degraded into small molecular substances such as galacturonic acid, the drainage of cotton stalk chemi-mechanical pulp is improved, and the influence of pectin on the papermaking process is eliminated.

The invention provides anti-aging high-strength composite wild goose skin paper as well as a preparation method and application of the anti-aging high-strength composite wild goose skin paper. According to the method, steaming is combined with compound enzyme treatment, dissociation extraction of the wild goose skin bast fibers and the bamboo pulp is achieved, and the quality and the yield of the wild goose skin fibers are guaranteed. Compared with chemical fibers, the wild goose skin fibers show obvious property enhancement. Then, the obtained pulp is subjected to different mixing ratios and beating modes, a specific sizing method and a sizing agent are combined to obtain the anti-aging and high-strength composite wild goose skin paper, the softness of the paper is guaranteed while the tightness and the strength are achieved, and the anti-aging and high-strength composite wild goose skin paper can be applied to the field of certain special paper.

A method for processing fibrous cellulosic material from algae comprising: (i) suspending the fibrous cellulosic material in water to form a suspension; and (ii) passing the suspension through at least one chamber having a large gap, at a high shear to produce cellulose nanofibrils. Also described are cellulose nanofibrils and cellulose nanocrystals, products, methods and uses of the same.

This invention discloses a food-grade antibacterial packaging paper based on biomass conversion and its preparation method, relating to the field of papermaking technology. The packaging paper uses areca leaf mechanical pulp rich in lignin and natural phenols as a substrate. After alkali treatment and oxidase activation of the phenolic hydroxyl groups on the fiber surface, a chitosan-tea polyphenol layer is coated onto its surface, followed by ionic crosslinking and interfacial co-crosslinking with phytic acid to construct a dense fiber-coating network structure. This improves the paper's mechanical strength, water and oil resistance, and inhibition of common pathogenic bacteria while maintaining its renewability, biodegradability, and food contact safety.

The disclosure relates to a method for reducing volatile organic compounds (VOC) from wood chips for wood fibre production in a processing system, at least comprising the following consecutive steps: a first thermal treatment of the wood chips in a first thermal treatment device, which is designed to receive VOC-containing waste gases; cleaning the wood chips in a washing device; a second thermal treatment of the wood chips in a second thermal treatment device, which is designed to receive and separate VOC-containing waste gases; digesting the wood chips in a digester, which is designed to receive and separate VOC-containing waste gases; and crushing the wood chips in a refiner, which is designed to separate VOC-containing waste gases. This allows for an efficient, and thus energy-optimised or environmentally friendly and therefore also cost-optimised reduction of volatile organic compounds from wood chips.

The utility model discloses a cotton stalk pulping material preparation system, relates to the technical field of papermaking, and mainly aims to remove impurities and provide qualified cotton stalk material sheets. According to the main technical scheme, the cotton stalk pulping material preparation system comprises a grass chopping mechanism, a belt conveyor and an impurity removing mechanism which are connected in sequence; an inlet of the first fan is connected to a discharging port of the impurity removal mechanism, an outlet of the first fan is connected to a tangential inlet of the first cyclone separator, an outlet in the upper end of the first cyclone separator is connected to an inlet of the second fan, and an outlet of the second fan is connected to a tangential inlet of the second cyclone separator. An upper end outlet of the second cyclone separator is connected to an inlet of the third fan, an outlet of the third fan is connected to an inlet of the spraying dust removal tower, and a lower end outlet of the second cyclone separator is connected to the collecting bin; and an outlet at the lower end of the first cyclone separator, the roller type grass washer and the inclined spiral dehydrator are connected in sequence.

The application discloses a method for preparing electronic-grade insulating pulp from bamboo, and relates to the technical field of insulating pulp production and preparation, and comprises the following preparation steps: step A, collecting bamboo raw materials in Hunan area; step B, flaking operation, bamboo is flaked and cut into pieces in a bamboo processing factory; step C, water washing operation, bamboo pieces are washed to balance water content; step D, cooking operation, bamboo pieces are cooked by adopting sulfite process, and the yield of the crude pulp is controlled to be 40-50%; step E, screening operation; step F, beating operation; step G, sheeting operation and strength detection. The method for preparing electronic-grade insulating pulp from bamboo has certain regionalism by adopting locally planted bamboo in Hunan, the prepared electronic-grade insulating pulp reaches the superior standard, and the prepared electronic-grade insulating pulp has the quality index that the conductivity is less than 3 us / cm by adopting deionized water for washing in the whole process.

A method for producing a cellulose polymer having a cellulose content of 92% or more from textile waste, It is a mixture of cotton and PET, and the raw material (educt) is less than 1mm in length. The mixture is treated in a reactor with subcritical water at a temperature of 130 to 200° C., particularly preferably 160 to 200° C., and a pressure of 1 to 25 bar, preferably 1 to 10 bar, for about 1 to 120 minutes. A method for producing a cellulose polymer having an average degree of polymerization of 450 to 650.

The invention discloses a method for efficiently extracting straw hemicellulose through physical and chemical synergistic reinforcement, and relates to the field of comprehensive utilization of crop straws. The method comprises the steps of raw material pretreatment, alkali liquor preparation and mixing, ultrasonic pretreatment, alkali liquor extraction, pH adjustment, supernatant separation and concentration, hemicellulose precipitation, separation post-treatment and the like, and the core is to destroy a straw cell wall structure by utilizing an ultrasonic cavitation effect through cooperation of an ultrasonic physical effect and an alkali liquor chemical effect so as to enhance the permeability and improve the hemicellulose separation efficiency. And connecting bonds of the hemicellulose and other components are dissociated in cooperation with low-concentration alkali liquor, and efficient separation and extraction of the hemicellulose are achieved. The extraction rate of the straw hemicellulose can reach 85% or above, the concentration of the used alkali liquor is only 0.5-10%, the extraction time is only 1-1.5 hours, and the chemical structure of the hemicellulose can be completely reserved. The method is easy to operate, low in cost, environmentally friendly, suitable for various raw materials such as corn straw and wheat straw and capable of being popularized on a large scale, and an effective technical scheme is provided for high-value utilization of straw biomass.

In a first aspect, the invention is directed to a process for preparing nanocellulose from a polymeric material comprising cellulose fibers, the process comprising: (i) Providing pieces p1 of the polymeric material comprising cellulose fibers; (ii) Shredding the pieces p1 provided according to (i) in n shredding devices SD(i) wherein n is an integer with n≥1 and i=1...n, thereby obtaining pieces p2, which comprise cellulose fibers; (iii) Preparing an aqueous mixture comprising the pieces p2 at a temperature T1 and adjusting the temperature of the aqueous mixture comprising the pieces p2 to a temperature T2 with T2 > T1, thereby obtaining an aqueous mixture comprising the pieces p2 and having temperature T2; (iv) Introducing at least one enzyme capable of degrading cellulose (cellulase) into the aqueous mixture obtained according to (iii), thereby obtaining an aqueous mixture comprising the pieces p2 and at least one enzyme, wherein the aqueous mixture has temperature T2; (v) optionally milling the aqueous mixture obtained according to (iv) in a milling device MD(1), thereby obtaining an aqueous mixture comprising the at least one enzyme and milled pieces p3, which comprise at least partially degraded cellulose fibers; and (vi) Milling the aqueous mixture obtained according to (iv) or (v) in a stirred media mill SMM, thereby obtaining an aqueous mixture comprising the at least one enzyme and nanocellulose (at least partially degraded and / or at least partially defibrillated cellulose).

The invention relates to the technical field of artificial board processing, and discloses a method for preparing a low VOCs type medium density fiberboard based on a wood fiber hydroxyl complexing sealing technology. The method comprises the following steps: firstly, carrying out steam explosion pretreatment on wood fibers, destroying the crystal structure of the wood fibers and activating hydroxyl; carrying out carboxylation and condensation polymerization on the activated fibers by adopting biomass-based polycarboxylic acid and amine compounds, and constructing complexing sites on the surfaces of the fibers; then metal ions are introduced to be subjected to a complexation reaction with the fibers, and stable sealing of hydroxyl in fiber molecules is achieved; and finally, sizing by adopting a modified bean-based protein adhesive, and carrying out paving, pre-pressing and hot press molding. Through the synergistic effect of activation, crosslinking and complexation, a VOCs release channel is blocked from the source, the formaldehyde release amount of the prepared fiberboard is smaller than or equal to 0.025 mg / m < 3 > (ENF level), the total VOCs release amount is smaller than or equal to 200 micrograms / m < 3 >, the odor level is remarkably reduced, meanwhile, the mechanical property is excellent, and outstanding environmental friendliness and practicability are achieved.

The application discloses a method for preparing bio-mechanical pulp by treating bamboo with the aid of a ternary eutectic solvent and a biological enzyme, and the bamboo is pretreated with the eutectic solvent to improve the treatment efficiency of the subsequent biological enzyme, so that the prepared pulp has high yield and excellent paper performance; moreover, the eutectic solvent can be recycled, the overall process reduces the chemical consumption, does not generate a large amount of wastewater, can reduce environmental pollution, conforms to the development direction of lower energy consumption, lower pollution and lower water consumption of modern papermaking industry, and has a wide application prospect.

The process for the production of particle board, MDF board or HDF board comprises the step of recycling particle board material, MDF and / or HDF board material in which recycled chips and / or recycled wood fibers are produced. The process comprises the step in which the particle board material, the MDF and / or HDF board material is wetted, heated and pressurized, wherein this material is kept under pressure and at an elevated temperature for a certain time. The process comprises the step of supplying the recycled chips and / or the recycled wood fibers as base material in a production process of particle board, MDF board or HDF board.

Disclosed herein are methods for producing a pulp or paper product from a plant material having bast and hurd fibers, such as a cannabis plant material. For example, there is method for producing a pulp or paper product from a plant material having bast and hurd fibers, the method comprising processing of a plant hurd fiber material into a hurd fiber pulp or pulp slurry in a first stream; processing of a plant bast fiber material into a bast fiber pulp or pulp slurry in a second stream; blending of the hurd fiber pulp or pulp slurry and the bast fiber pulp or pulp slurry to provide a blended pulp or pulp slurry; and producing the pulp or the paper product from the blended pulp or pulp slurry. Also provided are pulp and paper products produced from such methods. Also provided are cannabis pulp and paper products.

The present application relates to a kind of freeze-thaw cycle coupling pretreatment green disassembly lignocellulose method and its application.The present application is by using water or metal salt ion solution as medium to lignocellulose raw material is carried out freeze-thaw cycle pretreatment, coupling appropriate pretreatment method is carried out green disassembly, and the obtained solid material is carried out enzymolysis to complete the disassembly and conversion process of lignocellulose.The present application can effectively break the anti-degradation barrier of lignocellulose, reduce the pretreatment intensity, improve the utilization rate of component separation extraction, reduce the inhibitor generated by pretreatment, to promote enzymolysis and subsequent conversion and utilization, and the method can utilize regional cold resource advantage, with the advantages of simple process, energy saving, water saving, environmental protection, high sugar concentration and low cost.