71 results about "White water" patented technology

The invention discloses a fiber synergistic copolymer as well as a preparation method and application thereof, and belongs to the technical field of papermaking chemicals and high polymer materials. Aiming at anion garbage interference caused by deepening of closed circulation of white water in the papermaking industry and green compliance challenges caused by replacing plastic with paper, the copolymer adopts a specific polycarboxylic acid and trace cationic monomer structure-effect design, and has excellent anti-interference capability and permeability. In the wet-end in-pulp enhancement, the enhancement effect of the additive can be superior to that of a traditional high-molecular-weight additive only by a relatively low addition amount, and water filtration and retention are remarkably improved; in a surface sizing and pulp molding hot pressing process, the rigidity and the water-resistant size stability of a product can be greatly improved through a unique cross-linking mechanism. According to the scheme, the industrial pain point of low enhancement efficiency in a complex environment is effectively solved, and the product does not contain organic fluorine and completely meets the requirements of environmental protection and sustainable development of a high-performance fiber-based material.

The application discloses a multi-carboxyl copolymer aqueous composition for pulp adding in packaging paperboard, synergism in short-stay pulp of packaging paper and fiber synergism in wet end of bamboo pulp paper, and a preparation and application method thereof, and belongs to the technical field of pulp and paper chemicals and wet end chemical control. The composition contains carboxyl-rich copolymer, and can be selected as high filtration rate homogeneous aqueous solution type, flexible type acid or bamboo pulp low cation density copolymer according to paper types, and is prepared through water phase free radical polymerization. In application, the composition is diluted and then added in a divided mode after a fan pump outlet to a pressure screen inlet or after a cationic polyacrylamide retention agent or in a bamboo pulp system. The method is beneficial to improving fiber combination, drainage stability, first-pass retention rate, white water stability and paper strength, and improving the adaptability of wet end dosing windows of different paper types.

The invention relates to the technical field of titanium dioxide production, in particular to high-retention and high-weather-resistance titanium dioxide as well as a preparation method and application thereof. Comprising a titanium dioxide base material and a coating layer located on the surface of the titanium dioxide base material, and the coating layer sequentially comprises an aluminum oxide film layer, a tin oxide film layer and an ascorbyl palmitate film layer from inside to outside. The preparation method comprises the following steps: preparing titanium dioxide-based material slurry, sequentially carrying out aluminum oxide coating and tin oxide coating, then carrying out water washing, flash evaporation and steam powdering, and adding ascorbyl palmitate in the steam powdering process to obtain the high-retention and high-weather-resistance titanium dioxide. The tin coating layer and the ascorbyl palmitate coating layer are introduced to the outer side of the aluminum oxide coating layer, so that the retention rate and weather resistance of titanium dioxide in paper are remarkably improved, and the use requirements of high-end paper are met; the white water treatment pressure can be reduced, and the economic benefit is improved.

A high-gram-weight raw paper white water advanced treatment system relates to the technical field of white water treatment and comprises a disc filter, and the outlet end of the disc filter is respectively connected with an ultra-clear filtrate tank and a clear filtrate tank; the outlet end of the ultra-clear filtrate tank is connected with a tubular filter, and the outlet end of the tubular filter is connected with a net pressure part high-pressure sprayer; and the outlet end of the clear filtrate tank is connected with the ultra-clear filtrate tank through a circulating fine filtration structure. The utility model solves the problem that in the prior art, the treatment depth of clear filtrate and ultra-clear filtrate after white water is treated by a physicochemical treatment method or a biological treatment method does not reach the degree that the clear filtrate and the ultra-clear filtrate can be used for high-pressure spray water of a net part.

The invention discloses a system for purifying and separating papermaking white water fine stickies, and belongs to the technical field of pulping and papermaking wastewater treatment. Comprising a physical grading deslagging unit, a chemical modification treatment unit, a biological enzymolysis reaction unit and a slurry forming unit which are sequentially communicated through a conveying pipeline I, wherein a conveying pipeline II is arranged between a feeding hole of the physical grading deslagging unit and a waste slurry discharging hole of the slurry forming unit, and a white water deep filtering unit is arranged on the conveying pipeline II; the physical grading deslagging unit, the chemical modification treatment unit, the biological enzymolysis reaction unit and the white water deep filtering unit can form a white water backflow circulation path through a conveying pipeline I and a conveying pipeline II. The system for purifying and separating the fine stickies in the papermaking white water, disclosed by the invention, can realize graded and accurate removal of the stickies with large, medium and small particle sizes in the papermaking white water, and effectively solves the problems of deposition and scaling of the stickies in equipment.

The utility model discloses a tailing fiber recycling device for a deslagging section. The tailing fiber recycling device comprises a feeding tank, a first multi-section deslagging device, a transverse deslagging device, a second multi-section deslagging device, a white water tank, a slag tank and an accepted pulp tank, a feeding hole of the first multi-section slag separator is communicated with the discharging end of the feeding tank, and a slag outlet in the bottom of the first multi-section slag separator is communicated with a feeding hole of the transverse slag separator; preliminary deslagging and filtering are carried out through the first multi-section deslagging device, filtered slag slurry enters the transverse deslagging device, and white water is pumped into the transverse deslagging device through the white water tank, so that the slag slurry is rotationally separated in the transverse deslagging device; and the formed accepted pulp is automatically returned to the first multi-section slag separator, is discharged from the accepted pulp opening after being subjected to slag discharge, and further fiber recovery is realized through mutual cooperation of the transverse slag separator, the first multi-section slag separator and the second multi-section slag separator, so that the fiber content in the slag pulp is lower, and the utilization rate of the fiber is improved.

The utility model discloses a kind of papermaking white water fiber air floatation device, it is related to papermaking white water recovery technical field, including dross pond, the inside of the dross pond is provided with multiple filter screens, vibration mechanism is provided on the dross pond, the vibration mechanism is used to drive filter screen to vibrate, and press mechanism is connected on the vibration mechanism;The vibration mechanism includes first motor, the first motor is installed above the dross pond, the output end of the first motor is connected with shaft, and the press mechanism includes fixed frame, the fixed frame is connected on the shaft, the press mechanism further includes pressing plate, second fixed ring is connected on the pressing plate, one end of the fixed frame close to second fixed ring is rotatably connected with runner, the runner and second fixed ring contact, and the pressing plate is elastically connected above one of filter screen, the present scheme can further process by-product dross in air floatation device, to improve the recovery value of dross.

1. Name of the designed product: packing box (white water intestine). 2. Use of the designed product: for packing sausage. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

The utility model discloses a kind of pulping white water multi-disc conveying spiral shaft head, it is related to papermaking pulping technical field, including main shaft body and conveying spiral connecting end, the conveying spiral connecting end is fixedly connected in main shaft body end part;The connecting place of main shaft body and conveying spiral connecting end is equipped with flange, the flange is welded with stainless steel flange, main shaft body and stainless steel flange form integral structure, welding seam is formed between the flange and stainless steel flange inner side, four shaft head disassembly jackscrew thread holes that are circumferentially evenly distributed are equipped in the inside of stainless steel flange.The pulping white water multi-disc conveying spiral shaft head, the flange of the shaft head and the conveying spiral connection is changed into stainless steel flange and carbon steel shaft head firm welding into an integral whole, both reduce cost, and also guarantee the durability of easy rusting corrosion site, after amplification of disassembly jackscrew thread hole, the probability of screw rod breakage reduces, and disassembly shaft head is more relaxed.

The present application belongs to the field of papermaking industry water treatment and clean production, especially to a white water treatment system suitable for the spraying water of the wire section and press section of a paper machine, which comprises: a clean water pretreatment unit for high-precision filtration of clean water to remove suspended solids and particulate impurities in the water and ensure the cleanliness of the spraying water; a high-pressure liquid supply unit connected with the clean water pretreatment unit for pressurizing the pretreated clean water to ultrahigh pressure and secondary precision filtration to provide a stable high-pressure cleaning water source; a water quality stabilization unit connected with the high-pressure liquid supply unit for adding a compounded agent to the high-pressure spraying water and real-time regulation and control of the water quality to inhibit bacterial growth and scaling corrosion; and a partition spraying unit connected with the high-pressure liquid supply unit for ultrahigh-pressure precision cleaning of the forming wire and press felt of the wire section and press section of the paper machine. The present application provides a high-integration, recyclable, energy-saving and consumption-reducing spraying water white water treatment system.

The invention relates to an efficient energy-saving process design method for a multi-disc thickener, which comprises the following steps: a bypass channel is constructed between a feeding end and a discharging end of the multi-disc thickener, and is used for guiding part of raw slurry entering the multi-disc thickener to directly flow to an outlet of concentrated slurry; the concentrated slurry is washed with the raw slurry, and the processing capacity of the multi-disc thickener is improved; the concentration of the raw slurry is 0.5-2%, and the concentration of the concentrated slurry is 3-10%. The problem that in order to supply white water and maintain operation of related equipment, extra electric energy needs to be consumed is solved, and the energy consumption cost is further improved. The problems limit the overall performance and the production benefit of the multi-disc thickener.

The invention discloses a polyether type defoaming agent as well as a preparation method and application thereof, and the polyether type defoaming agent is obtained by carrying out second polymerization on 35%-65% of allyl polyoxyethylene ether, 20%-65% of allyl polyoxypropylene ether and 0%-15% of allyl polyoxybutylene ether; the allyl polyoxyethylene ether is formed by first polymerization of allyl alcohol and ethylene oxide, the allyl polyoxypropylene ether is formed by first polymerization of allyl alcohol and epoxypropane, and the allyl polyoxybutylene ether is formed by first polymerization of allyl alcohol and epoxybutane. When the polyether type defoaming agent is used in papermaking white water, the foam inhibition and defoaming properties are obviously improved, and the quality of paper products is not influenced.

The application discloses a fiber synergistic copolymer and a preparation method and application thereof, and belongs to the technical field of papermaking chemicals and high polymer materials. In view of the anion garbage interference caused by the deepening of white water closed circulation in the papermaking industry and the green compliance challenge brought by 'paper instead of plastic', the copolymer is designed in structure and function by using specific polycarboxylic acid and trace cationic monomer, and has excellent anti-interference ability and permeability. In the wet end pulp strengthening, the copolymer can surpass the strengthening effect of traditional high molecular weight additives by only needing a low amount of addition, and significantly improves the drainage and retention; in the surface sizing and paper pulp molding hot pressing process, the copolymer can greatly improve the rigidity and water resistance dimensional stability of products through a unique crosslinking mechanism. The scheme effectively solves the industry pain point of low strengthening efficiency in a complex environment, and the product does not contain organic fluorine, and completely meets the environmental protection and sustainable development needs of high-performance fiber-based materials.

The invention discloses a method for removing and degrading starch by a compound enzyme system in a pulping process of waste box boards, which comprises alpha-amylase, beta-amylase, glucoamylase, pullulanase and pectinase. OCC white water and OCC paper pulp are subjected to enzymolysis through alpha-amylase and another three kinds of compound enzymes (beta-amylase, pullulanase and glucoamylase) which are compounded (the enzyme activity is conventional enzyme activity), and when the dosage of the compound enzymes is 1000 mL * t <-1 >, the enzymolysis rate of the compound enzymes is far superior to that of single alpha-amylase with the dosage of 5000 mL * t <-1 > at the same enzymolysis time; the starch decomposition rate of the waste paper pulp is increased by 3.75 times and reaches 42.8%, and the white water is correspondingly increased by 38% and reaches 42.8%.

The invention relates to an efficient toning method in paper product production, which comprises two stages of preparation before startup and sizing and real-time toning, and specifically comprises the following steps: the preparation stage before startup comprises the following steps: S11, collecting related data required for producing cardboard paper, the data at least comprise target paper quantification, slurry flow, white water circulation system parameters and cardboard paper target color parameters, the white water circulation system parameters comprise white water flow and residual dye components and content in white water, and the cardboard paper target color parameters comprise RGB values or Lab values; the technical problems that according to an existing paper product color matching method, the color matching process time is long, the production efficiency is greatly affected, the invalid operation time of equipment is prolonged, the yield in unit time is reduced, meanwhile, due to the fact that dye needs to be continuously added and adjusted in the color matching process, a large amount of dye is wasted, and the production cost is increased are solved.

The invention provides a method for producing high-bulk and thick kitchen paper by adopting bamboo pulp, and belongs to the technical field of papermaking, and the method comprises the following steps: S1, feeding bamboo pulp fibers into a pulping machine for pulping treatment to obtain pretreated pulp; s2, diluting the pretreated pulp with white water in a pre-papermaking pulp tank, and adding a wet strength agent to obtain finished pulp; s3, spraying the finished pulp to an included angle area of a forming net and a blanket, and then forming a wet paper sheet after extrusion dehydration of the forming net and the blanket, suction dehydration of a vacuum suction roller, shoe type press dehydration and ultrahigh vacuum shaping dehydration; s4, the wet paper sheet is sequentially subjected to high-temperature gas hood recovery hot air penetration, a drying cylinder and high-temperature gas hood hot air drying treatment, and paper is formed; and S5, wrinkling the dried paper by using a scraper, scraping the wrinkled paper away from the drying cylinder, and winding the wrinkled paper into a mother roll after the wrinkled paper enters a winding part through an arc-shaped roller, so as to obtain the kitchen paper. The kitchen paper is produced from 100% bamboo pulp or full bamboo pulp raw materials, and is high in bulk, good in water absorption and excellent in softness.

The utility model discloses a vacuum dewatering system for a net part of a paper machine. The vacuum dewatering system comprises a vacuum device, three steam-water separators, three under-machine white water tanks and three out-machine white water tanks, an outlet pipeline of each steam-water separator is connected to an inlet pipe of the vacuum device; each steam-water separator is respectively provided with a water leg, the water leg of each steam-water separator is respectively connected to the corresponding under-machine white water tank, an inlet pipe of each steam-water separator is connected with at least one vacuum box, each vacuum box is respectively provided with a water leg, and the water leg of each vacuum box is respectively connected to the corresponding off-machine white water tank. According to the technical scheme provided by the utility model, the stable vacuum dehydration process can still be ensured under the conditions that the speed of the paper machine is accelerated and the mixing amount of pulp and water at a net part is greatly increased, so that the vacuum dehydration is uniform and stable, and the reliability and continuity of the operation of the paper machine are greatly improved.

The present invention relates to a water and air separation system (100), an inlet portion (10) having a receiving inlet (11); A guide portion (20), The guide portion (20) A housing (24); A separation chamber (40); Entrance (21), a plurality of guide channels (12) for conveying the whitewater spray into a separation chamber; A liquid outlet (22); a gas outlet (23); The guide portion (20) further comprises a first separation plate (41) arranged to divide the separation chamber (40) into a first compartment (A) and a second compartment (B), whereby a connecting passage (46) is formed for passing the white water under the first separation plate (41) to the second compartment (B), thereby separating the white water from the air of the white water spray.

The utility model relates to a pulp flushing system for plant fiber molded tableware, which is characterized in that a thick pulp tank is communicated with the input end of a pulp preparing pump, the output end of the pulp preparing pump and a white water tank are both communicated with the input end of a pulp flushing pump, and the output end of the pulp flushing pump is communicated with a pulp storage tank; the slurry preparation flow monitoring part and the thick slurry concentration monitoring part are both located between the slurry preparation pump and the slushing pump, the signal acquisition end of the slurry preparation frequency monitoring part is connected with the signal output ends of the slurry preparation pump, the slurry preparation flow monitoring part and the thick slurry concentration monitoring part, and the control end of the slurry preparation frequency monitoring part is connected with the control end of the slurry preparation pump; the slushing flow monitoring part is located between the slushing pump and the slushing tank, the signal acquisition end of the slushing frequency monitoring part is connected with the signal output end of the slushing pump and the signal output end of the slushing flow monitoring part, and the control end of the slushing frequency monitoring part is connected with the control end of the slushing pump. And the control end of the slurry storage liquid level monitoring part is connected with the control ends of the slushing frequency monitoring part and the thick slurry frequency monitoring part. The system can be used for adaptively, automatically, efficiently and properly flushing slurry based on the concentration of the thick slurry.

The utility model discloses a self-cleaning system of a papermaking white water tower. The papermaking white water tower comprises a tower body, the tower body is provided with an inclined tower bottom, a water outlet in the lower portion of the tower body is connected with an inlet of a driving pump through a water outlet pipeline, an outlet of the driving pump is connected with white water treatment equipment through a water conveying pipeline, and a sewage draining outlet in the lower portion of the tower body is connected with a sewage draining pipeline. The papermaking white water tower self-cleaning system comprises an annular cleaning header pipe arranged around the outer wall of the lower portion of the tower body, the cleaning header pipe is connected with the water conveying pipeline through a connecting pipe, and the cleaning header pipe is connected with inlets of a plurality of cleaning branch pipes. Outlets of the cleaning branch pipes penetrate through the side wall of the tower body, then extend downwards to the tower bottom and face the sewage draining exit, the cleaning branch pipes are evenly distributed on the cleaning main pipe at intervals, and a cleaning switch valve is installed on the connecting pipe. According to the utility model, the tower bottom can be automatically cleaned under the condition that the papermaking white water tower is not stopped, and the cleaning efficiency is high.

The application belongs to the technical field of white water treatment, and particularly relates to a paper mill white water multi-stage treatment and recycling system, which comprises a white water collecting module, the white water collecting module is connected with a water quality online monitoring module, the water quality online monitoring module is connected with a pretreatment adjusting module, the pretreatment adjusting module is connected with a flocculant automatic adding module, the flocculant automatic adding module is connected with a high-efficiency flocculation reaction module, the high-efficiency flocculation reaction module is connected with a multi-disc filtering module, and the multi-disc filtering module is connected with a filtrate shunt module, the application realizes efficient and refined multi-stage treatment and recycling, significantly improves the overall efficiency of the system and the value of the recycled materials, builds an intelligent closed-loop control system with data driving as the core, guarantees efficient, stable and low-cost operation of the system, forms a sustainable closed-loop operation mode integrating energy saving, bacteriostasis and safety protection, and improves the reliability and environmental friendliness of the system.

The invention discloses a comprehensive utilization method of white water. The method comprises the following steps: making paper for daily use and generating first white water; the non-woven fabric is produced, and second white water is generated; filtering the first white water to obtain first clear white water, and filtering the second white water to obtain second clear white water; spraying at least one part of the first clear white water serving as spraying water to a forming net used in non-woven fabric production; at least one part of the second clear white water is used for pulp dispersing treatment or pulp preparing treatment in the production of the household paper, the first white water in the production process of the household paper with the high chemical content is used for spraying in the production process of the non-woven fabric, and the second white water in the production process of the non-woven fabric with the low chemical content is used for pulp dispersing and pulp preparing. And meanwhile, the water consumption in the production process of the white water and the white water can be balanced, so that the clean water consumption in the whole production system is reduced.

The application provides a filter system based on papermaking white water, which comprises two first supporting frames and two second supporting frames, the two first supporting frames are located between the two second supporting frames, a filter cylinder is provided with filter holes, the two ends of the filter cylinder are rotatably connected to the top of the two first supporting frames, a first driving mechanism is used for driving the filter cylinder to rotate, two blocking rings are coaxially connected to the two ends of the filter cylinder respectively, a through hole is formed in the middle of the blocking ring, the two ends of a bearing piece are provided with connecting parts, a cleaning pipe is in communication with one end of the bearing piece, and a discharge pipe is in communication with the bottom of the other end of the bearing piece, a plurality of water inlets are formed in a water inlet pipe, a blowing head is connected with a blower for blowing the blowing head, the blowing head is provided with an air outlet, the air outlet is downwardly and vertically opposite to the top of the filter cylinder, and a second driving mechanism is used for driving the blowing head to reciprocate along the length direction of the filter cylinder. The filter system based on papermaking white water can achieve better filtering effect.

The application relates to the technical field of wastewater recovery treatment, and discloses a papermaking white water recovery equipment, which comprises a recovery tank body, the inside of the recovery tank body is provided with a recovery containing space, one side end is provided with a conical discharge end, and the other side end is provided with an opening; papermaking white water flows into the recovery tank body through the opening; a partition plate assembly is arranged on the inside of the recovery tank body and is used for separating the inside space of the recovery tank body into a negative pressure area and two air flotation areas; and a filter assembly is arranged on the inside of the recovery tank body. The papermaking white water recovery equipment aims to solve the problems that the purification precision of a filter equipment is insufficient, micro fibers and fillers and other substances cannot be completely recovered, resources are wasted, an air flotation equipment depends on a prefiltering equipment, foam is generated during operation and needs to be additionally treated, the equipment has high investment, cleaning and maintenance are complicated, human cost is high, and system operation efficiency is low.

The present invention relates to a method for manufacturing a barrier film comprising highly refined cellulose, said method comprising: a) providing a highly refined cellulose pulp suspension comprising highly refined cellulose pulp having a Schopper-Riegler (SR) number in the range of 40-98 as determined by standard ISO 5267-1 and a content of fibers having a length >0.2 mm of at least 7 million fibers per gram based on dry weight, at a consistency in the range of 0.1-1.5 wt %; b) forming a web of the highly refined cellulose pulp suspension and dewatering the web in a paper machine former on a wire to a consistency of at least 5 wt % to obtain a substrate web, wherein the white water removed from the pulp contains 2-25 wt %, preferably 5-20 wt % and more preferably at least 5-15 wt % of the solids of the highly refined cellulose pulp suspension provided in step a); c) optionally further dewatering and optionally drying the substrate web; d) coating the optionally further dewatered and optionally dried substrate web with a coating suspension comprising cellulose fines or microfibrillated cellulose to obtain a coated web; and e) dewatering and / or drying the coated web to obtain a barrier film comprising highly refined cellulose.

The utility model relates to the technical field of steam treatment, in particular to a white smoke eliminating device for producing steam, which comprises a reflux tank fixedly arranged on the ground, two cooling units symmetrically mounted at the top of the reflux tank, and a reheating unit mounted at the tops of the two cooling units. Two air inlets of the reheating unit are connected with corresponding air outlets of the cooling units, a steam supply pipe set is installed between the two cooling units, two outlet ends of the steam supply pipe set are connected into the cooling units respectively, the air inlet end of the steam supply pipe set is connected with an external steam pipeline, and the air outlet end of the steam supply pipe set is connected with an air outlet of the external steam pipeline. And a cooling liquid supply pipe group is arranged above the steam supply pipe group. According to the device, water vapor in high-temperature steam is condensed into liquid water through the cooling unit, so that white water vapor plumes formed in the atmosphere due to the fact that the water vapor is cooled when the steam is discharged are greatly reduced, the white elimination effect of the steam is achieved, the influence on the environment appearance is reduced, and visual pollution caused by the white water vapor plumes is avoided.

The application discloses a web composite forming method for improving the interlayer bonding strength of boxboard, and comprises the following steps: step one, pulp property detection and grading control, step two, white water pretreatment and intelligent dilution water concentration adjustment, step three, pulp pre-dispersion and chest roller shaking forming, step four, composite surface micro-roughening treatment of the wet paper web, step five, interlayer modified starch atomization spraying, step six, multi-layer wet paper web compounding and bonding dryness control, step seven, stepwise vacuum dewatering, and step eight, wet paper web setting and subsequent conveying; the application realizes accurate adaptation of each process link to the pulp property, eliminates the uneven forming problem caused by the pulp property fluctuation from the raw material end, lays a uniform forming foundation for the improvement of the interlayer bonding strength, simultaneously effectively disperses the fiber flocculation group through pre-dispersion treatment, reduces the fiber longitudinal arrangement, makes the fiber distribution in the paper web more uniform, and improves the effectiveness of the interlayer fiber entanglement.

The present application belongs to the technical field of papermaking, and particularly relates to a production process and device of a veneered wood grain base paper. The production process comprises the following steps: S1, separately crushing and beating the natural coniferous pulp and the natural broadleaf pulp, and then mixing the two kinds of pulp in a pulp pool; S2, pumping the pulp to a pre-pulping pool through a pulp pool pump, and adding aluminum sulfate before the pump; S3, pumping the pulp to an off-machine white water tank through a pre-pulping pool pump, and adding anionic rosin size, cationic wax emulsion, PAE wet strength agent and PAM dry strength agent before the pump, and adding a bactericide and a defoaming agent in the off-machine white water tank; S4, pumping the pulp to a pressure screen through a pulp pump, and adding a retention aid before the pressure screen; and distributing the pulp to a wire part through a headbox, and then performing web forming, pressing and drying, so as to obtain the wood grain base paper. Through optimization of raw material ratio, beating mode, additive type and dosage and paper machine operation parameters, the present application realizes the excellent performance of low basis weight, high gloss, ideal printing effect and small shrinkage.

The invention discloses a method for on-line conversion of two-layer-stacked net cage paperboard into three-layer-stacked net cage paperboard. The method comprises the following steps: feeding liquid into a core layer pulp forming pool and a core layer white water pool to preset normal liquid levels; adjusting the opening degree of the vacuum valve of the core layer net part to be 1.5 times of the opening degree of the vacuum valve in normal operation; water feeding operation is tested, and the power of a core layer slushing pump is controlled to be 12-25% of the maximum power of the core layer slushing pump; the core layer net part is started, and the initial running speed is controlled to be 30 m / s; gradually increasing the power of a core layer slushing pump to 65-85% of the power of the core layer slushing pump during normal operation; controlling the moisture content of the two-layer stacked net cage paperboard to be subjected to production conversion to be 6.8-9.2%; the vacuum degree parameter of the core layer net part is adjusted, and the three-layer stacked net box paperboard is produced; the invention further discloses a method for on-line production of the three-layer net cage paperboard into the two-layer net cage paperboard. By controlling the opening degree of the vacuum valve, the power of the slushing pump, the sizing amount, the moisture content and other parameters of the core layer system, mutual production switching of three-layer and two-layer stacked net cage paperboard can be completed without shutdown.