CN112709089A - Production method for reconstructing corrugated medium paper by using waste paper by improving pulping and pulping process - Google Patents
Production method for reconstructing corrugated medium paper by using waste paper by improving pulping and pulping process Download PDFInfo
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- CN112709089A CN112709089A CN202011563495.0A CN202011563495A CN112709089A CN 112709089 A CN112709089 A CN 112709089A CN 202011563495 A CN202011563495 A CN 202011563495A CN 112709089 A CN112709089 A CN 112709089A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/04—Flat screens
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a production method for reconstructing corrugated core paper by using waste paper, which improves pulping and pulping processes, and comprises a pulping step, a hydraulic impurity removal step, a first precipitation step, a first low-concentration sand removal step, a pulp washing step, a pulping pretreatment step, a coarse pulp treatment step, a second low-concentration sand removal step, a second precipitation step, a flotation deinking step, a concentration step, a high-concentration filter pressing step, a pulp mixing and pulp blending step, a papermaking step, a drying step and a paper forming subsequent step.
Description
Technical Field
The invention relates to the technical field of production methods for reproducing paper by using waste paper, in particular to a production method for reproducing corrugated medium paper and corrugated paper by using waste paper, which improves pulping and pulping processes.
Background
At present, all production enterprises of corrugated paper including corrugated medium paper use waste paper such as waste paper boxes and waste paper boards as paper making raw materials, and the production enterprises of corrugated paper do not use raw wood pulp obtained by wood manufacturing as the paper making raw materials.
However, in the production process of using waste paper to produce corrugated medium paper again and further making corrugated paper, the process steps in the pulping process in the previous stage are more, wherein at least the steps of grinding, screening, filtering and washing are required to be carried out for a plurality of times, wherein grinding comprises a plurality of times of coarse grinding and a plurality of times of fine grinding, screening and filtering comprises a plurality of times of high-concentration filter pressing, a plurality of times of low-concentration filter pressing and a plurality of times of low-concentration sand removal, the pulping process has high energy consumption and long pulping time, the loss of equipment used in the pulping process is serious, and the equipment maintenance and replacement cost is high. Furthermore, the pulp is repeatedly processed many times during the pulping process, which damages the fibers in the pulp, the fiber breakage rate is generally above 30%, and the fiber surface is seriously damaged, which reduces the physical properties of the corrugated core paper and corrugated paper finally produced, and in addition, the fiber recovery rate in the waste paper is low, and the short fiber proportion in the processed pulp is high, which leads to the pulp leakage rate during the papermaking forming process, i.e. the pulp utilization rate is low, so that improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production method for reconstructing corrugated medium paper by using waste paper, which improves the pulping and pulping process, simplifies the pulping and pulping process by using a brand-new pulping and pulping process, reduces the fiber breakage rate while improving the fiber recovery rate, and improves the paper quality on the premise of reducing the production cost.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for producing corrugated medium paper by using waste paper and improving pulping and pulping process, which comprises the following steps,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, and discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp;
a hydraulic impurity removal step, namely pumping the waste paper raw pulp to a high-frequency vibrating screen through a pulp pump for hydraulic impurity removal treatment, and screening and separating impurities;
a first precipitation step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a first sand settling plate for precipitation treatment, and separating impurities to obtain raw pulp;
a first low-concentration desanding step, namely pumping the raw slurry to a first low-concentration desander for low-concentration desanding treatment;
a pulp washing step, namely pumping the raw pulp subjected to the first low-concentration desanding treatment to a pulp washer for pulp washing treatment, and pumping the raw pulp to a pulp forming pool for later use to obtain primary pulp;
a step of pre-treatment of pulping, which is to pump primary pulp to a coarse pulp grinder through a pump material pipeline, and to perform pulp conditioning treatment in the process of pumping, firstly pump 1-5% of an abrasion-resistant agent, 0.2-2% of a surfactant and 0.2-2% of a dissolving auxiliary material in the front section of the pump material pipeline according to weight percentage, then pump 0.5-5% of a medium-strength acid liquid with the mass concentration of 10-50% in the rear section of the pump material pipeline according to weight percentage, form conditioning pulp at the front end of a pulp inlet of the coarse pulp grinder and pump the conditioning pulp into the coarse pulp grinder;
a coarse pulping step, namely, performing short-time coarse pulping treatment only once on the conditioning pulp pumped into the coarse pulping machine through the coarse pulping machine, wherein a comb-tooth-shaped blunt-tooth grinding disc is selected for the coarse pulping machine used in the short-time coarse pulping treatment process, the pulping clearance of the upper blunt-tooth grinding disc and the lower blunt-tooth grinding disc is controlled to be 0.5-2mm, the pulping time of the conditioning pulp staying in the coarse pulping machine is controlled to be 1-5 minutes, and the conditioning pulp is pumped out through a pulp outlet of the coarse pulping machine to obtain coarse pulping pulp;
a second low-concentration desanding step, namely pumping the coarse grinding slurry to a second low-concentration desander for low-concentration desanding treatment;
a second precipitation step, namely pumping the coarse grinding slurry subjected to the second low-concentration desanding treatment to a second sand setting table for precipitation treatment and separating impurities;
flotation deinking, namely performing flotation deinking treatment on the coarse grinding pulp subjected to precipitation treatment to obtain pure pulp;
a concentration step, pumping the pure pulp subjected to flotation deinking treatment to a thickener for concentration treatment, washing the slurry by the thickener and improving the slurry concentration of the pure pulp;
a high-concentration filter pressing step, namely conveying the concentrated pure slurry to a high-concentration filter press and performing high-concentration filter pressing only once;
a pulp mixing and proportioning step, namely pumping the pure pulp subjected to high-concentration filter pressing treatment to a pressure proportioning box, and adjusting and stabilizing the concentration of the pulp to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
and a subsequent step of paper formation, namely performing press polishing treatment, rewinding treatment, slitting treatment and packaging treatment on the press polished corrugated medium paper to obtain the corrugated medium paper.
In a further technical scheme, before the step of size mixing and size mixing, a pulp crushing step, a hydraulic impurity removal step, a first precipitation step, a first low-concentration sand removal step, a pulp washing step, a pulp grinding pretreatment step, a rough pulp grinding treatment step, a second low-concentration sand removal step, a second precipitation step, a flotation deinking step, a concentration step and a high-concentration pressure filtration step are sequentially carried out.
In a further technical scheme, in the step of pretreatment before pulping, the wear-resistant agent, the surfactant and the dissolving auxiliary material are pumped to a mixing barrel according to the weight percentage, the materials are uniformly stirred by a stirrer installed in the mixing barrel to obtain mixed materials, the mixed materials are quantitatively pumped to a first mixing pipe according to the weight percentage by a first quantitative pump, the tail end of the first mixing pipe is connected to the front section of a pump material pipeline, the mixed materials are mixed into the conditioned slurry at the front section of the pump material pipeline, and the mixed materials are uniformly distributed in the conditioned slurry through turbulence generated in the pump material pipeline in the forward conveying process of the conditioned slurry; the coarse pulping machine is provided with a pulping chamber, a vertically arranged pulp inlet is arranged above the pulping chamber, the distance between the pulp inlet and the blunt tooth grinding disc is set to be 10-20cm, the rear section of a pump material pipeline is connected to the upper part of the pulp inlet, the medium-strength acid liquid is quantitatively pumped to the pump material pipeline at the pulp inlet through a second quantitative pump according to the weight percentage, and the retention time of the medium-strength acid liquid in the conditioning pulp is controlled for 1-3 seconds before the conditioning pulp enters the pulping chamber.
In the further technical scheme, in the step of pretreatment of pulping, 1-2% of the medium-strength acid liquid is pumped according to the weight percentage, and the mass concentration of the selected medium-strength acid liquid is controlled at 20-30%.
In a further technical scheme, the dissolving auxiliary materials comprise at least two of alkyl amine oxide, sodium carbonate, calcium carbonate, sodium hypochlorite, calcium hypochlorite and hydroxide.
In a further technical scheme, the surfactant is selected from at least one of hydroxyl compounds, ethers and ether alcohols, pyridines and ketones.
In a further technical scheme, the medium-strength acid solution comprises at least one of phosphoric acid, tartaric acid, sulfurous acid, pyruvic acid, oxalic acid and nitrous acid.
In a further technical scheme, passive rotating dispersing pulp which is driven by unpowered power is installed at the lower part of the pulp inlet, the conditioning pulp freely impacts the dispersing pulp after the conditioning pulp is flushed into the pulp inlet, and the conditioning pulp is dispersed and splashed around in different directions and accelerated to fly to the blunt-tooth grinding disc below the grinding chamber through the dispersing pulp.
In a further technical scheme, the dispersing pulp comprises an outer rotating ring in the shape of a circular ring and a plurality of arc-shaped blades fixed on the inner side of the outer rotating ring and arranged at intervals along the circumferential direction, the inner end of each blade is connected to the middle position of the outer rotating ring respectively, the outer end of each blade is connected to the outer rotating ring respectively, a bearing is installed on the inner wall of the pulp inlet, and the outer rotating ring is installed on the bearing and can rotate freely.
Compared with the prior art, the invention has the advantages that: the invention uses a brand-new pulping and pulping process, simplifies the pulping and pulping process, improves the recovery rate of fiber, reduces the fiber breakage rate and improves the quality of finished paper on the premise of reducing the production cost.
Detailed Description
A method for producing corrugated medium paper by using waste paper and improving pulping and pulping process, which comprises the following steps,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, and discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp;
a hydraulic impurity removal step, namely pumping the waste paper raw pulp to a high-frequency vibrating screen through a pulp pump for hydraulic impurity removal treatment, and screening and separating impurities;
a first precipitation step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a first sand settling plate for precipitation treatment, and separating impurities to obtain raw pulp;
a first low-concentration desanding step, namely pumping the raw slurry to a first low-concentration desander for low-concentration desanding treatment;
a pulp washing step, namely pumping the raw pulp subjected to the first low-concentration desanding treatment to a pulp washer for pulp washing treatment, and pumping the raw pulp to a pulp forming pool for later use to obtain primary pulp;
a step of pre-treatment of pulping, which is to pump primary pulp to a coarse pulp grinder through a pump material pipeline, and to perform pulp conditioning treatment in the process of pumping, firstly pump 1-5% of an abrasion-resistant agent, 0.2-2% of a surfactant and 0.2-2% of a dissolving auxiliary material in the front section of the pump material pipeline according to weight percentage, then pump 0.5-5% of a medium-strength acid liquid with the mass concentration of 10-50% in the rear section of the pump material pipeline according to weight percentage, form conditioning pulp at the front end of a pulp inlet of the coarse pulp grinder and pump the conditioning pulp into the coarse pulp grinder;
preferably, the dissolution auxiliary materials comprise at least two of alkyl amine oxide, sodium carbonate, calcium carbonate, sodium hypochlorite, calcium hypochlorite and hydroxide. The medium strong acid solution comprises at least one of phosphoric acid, tartaric acid, sulfurous acid, pyruvic acid, oxalic acid and nitrous acid. The surfactant is selected from at least one of hydroxyl compounds, ethers and ether alcohols, pyridines and ketones, and is used for foaming to improve the dispersion speed.
Preferably, in the step, 1-2% of the medium-strength acid solution is pumped in by weight percentage, and the mass concentration of the selected medium-strength acid solution is controlled to be 20-30%, so that all the medium-strength acid solution is consumed by all reactions in the subsequent coarse grinding treatment step, that is, no medium-strength acid solution is left in the coarse grinding slurry obtained after the coarse grinding slurry treatment step, that is, no special treatment step is required to be additionally arranged to remove the medium-strength acid solution.
A coarse grinding and pulp processing step, namely, performing short-time coarse grinding and pulp processing on the conditioning pulp pumped into the coarse grinding and pulp processing only once by using a coarse grinding and pulp processing machine, wherein a comb-tooth-shaped blunt-tooth grinding disc is selected as the coarse grinding and pulp processing machine used in the short-time coarse grinding and pulp processing process, the grinding gaps of an upper blunt-tooth grinding disc and a lower blunt-tooth grinding disc are controlled to be 0.5-2mm, the grinding gaps are set to be large gaps, and the comb-tooth-shaped blunt-tooth grinding discs are matched to break up blocky fiber blocks into small-particle-size fiber bundles, avoid damaging fibers in the conditioning pulp, control the grinding time of the conditioning pulp staying in the coarse grinding and pulp processing machine to be 1-5 minutes, and pumping out the conditioning pulp through a pulp outlet of; preferably, the pulping time of the conditioning pulp staying in the coarse pulping machine is controlled to be 2 minutes, the coarse pulping time is reduced so as to reduce the breakage rate and the breakage rate of the fibers, the dissolving auxiliary materials and the medium-strength acid liquor are mixed in the conditioning pulp, so that the substances such as printing ink, grease, metal powder, cement, residual sludge and the like in fiber blocks still coagulated into blocks in the pulp can be quickly dissolved, particularly, oily substances, silt and the like attached to the surfaces of the fibers can be quickly removed, the main body of the fibers can not be damaged while the surfaces of the fibers are roughened by controlling the addition amount and the time, the medium-strength acid liquor is completely reacted in the coarse pulping process, secondary treatment of additives is not needed, white water is added after primary coarse pulping in the coarse pulping treatment step in the production process of corrugated core paper and corrugated paper with low requirements on the quality of the finished paper, the white water is diluted and filtered after dilution, the corrugated core paper and the corrugated paper are produced by the following processes of filtering clean impurities, conveying the impurities to a pulp distribution station for pulp distribution, papermaking forming, drying and the like, the whole pulp grinding process only needs one-time rough pulp grinding, the pulp grinding time is extremely short, the fiber breakage rate in the pulp grinding process is extremely low, more than 95% of long fibers in the paper pulp can be preserved, the damage and the damage to the fibers in the pulp are minimum, the pulp grinding energy consumption is extremely low, and the paper forming strength and the quality are better.
Preferably, in the step of coarse grinding slurry treatment, the following steps are sequentially performed,
a second low-concentration desanding step, namely pumping the coarse grinding slurry to a second low-concentration desander for low-concentration desanding treatment;
a second precipitation step, namely pumping the coarse grinding slurry subjected to the second low-concentration desanding treatment to a second sand setting table for precipitation treatment and separating impurities;
flotation deinking, namely performing flotation deinking treatment on the coarse grinding pulp subjected to precipitation treatment to obtain pure pulp;
a concentration step, pumping the pure pulp subjected to flotation deinking treatment to a thickener for concentration treatment, washing the slurry by the thickener and improving the slurry concentration of the pure pulp;
a high-concentration filter pressing step, namely conveying the concentrated pure slurry to a high-concentration filter press and performing high-concentration filter pressing only once;
a pulp mixing and proportioning step, namely pumping the pure pulp subjected to high-concentration filter pressing treatment to a pressure proportioning box, and adjusting and stabilizing the concentration of the pulp to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
and a subsequent step of paper formation, namely performing press polishing treatment, rewinding treatment, slitting treatment and packaging treatment on the press polished corrugated medium paper to obtain the corrugated medium paper.
The method comprises the steps of pulping, hydraulic impurity removal, first precipitation, first low-concentration sand removal, pulp washing, pulp refining pretreatment, coarse pulp refining, second low-concentration sand removal, second precipitation, flotation deinking, concentration and high-concentration pressure filtration. The pulping and pulping process between the first low-concentration sand removal step and the pulp mixing and blending step is improved into a brand-new pulping and pulping process, the pulping and pulping process is simplified, the problem that fibers in pulp are damaged when pulp is repeatedly processed in the existing pulping process is solved, the fiber breakage rate is reduced to be below 10%, the fiber surface breakage rate is reduced to be below 5%, the physical performance of finally produced corrugated core paper and corrugated paper is improved, in addition, the recovery rate of the fibers in waste paper is improved to be above 95%, and the proportion of short fibers in the processed pulp is reduced to be below 5%, so that the pulp leakage rate of the pulp is reduced to be below 5% in the papermaking forming process, and the utilization rate of the pulp in the papermaking process is improved. The improved pulping and pulping process has the advantages of extremely small quantity of equipment including the coarse pulping machine, reduced equipment input amount, reduced equipment input cost, extremely low operation energy consumption required in the pulping and pulping process, and greatly reduced land area.
In the step of the pulping pretreatment, the wear-resistant agent, the surfactant and the dissolving auxiliary material are pumped to the mixing barrel according to the weight percentage, the materials are uniformly stirred by a stirrer installed in the mixing barrel to obtain mixed materials, the mixed materials are pumped to the first mixing pipe according to the weight percentage by the first quantitative pump, the tail end of the first mixing pipe is connected to the front section of the pump material pipeline, the mixed materials are mixed into the conditioning slurry at the front section of the pump material pipeline, the mixed materials are uniformly distributed in the conditioning slurry through turbulence generated in the pump material pipeline in the forward conveying process of the conditioning slurry, and the dissolving auxiliary material is fully dispersed in the conditioning slurry firstly. The coarse pulping machine is provided with a pulping chamber, a vertically arranged pulp inlet is arranged above the pulping chamber, the distance between the pulp inlet and the blunt tooth grinding disc is set to be 10-20cm, the rear section of a pump material pipeline is connected to the upper part of the pulp inlet, a medium-strength acid liquid is quantitatively pumped to the pump material pipeline at the pulp inlet by a second quantitative pump according to the weight percentage, the retention time of the medium-strength acid liquid in the conditioning slurry is controlled for 1-3 seconds before the conditioning slurry enters the pulping chamber, the medium-strength acid liquid is mixed when the conditioning slurry enters the pulp inlet of the coarse pulping machine, the medium-strength acid liquid is prevented from prematurely contacting the fibers in the conditioning slurry, the medium-strength acid liquid is prevented from corroding and damaging the fibers in the conditioning slurry, the conditioning slurry mixed in the medium-strength acid liquid immediately enters the pulping chamber of the coarse pulping machine, and the large-particle-diameter fiber blocks in the conditioning slurry are crushed into small-particle-diameter fiber bundles through the blunt tooth grinding disc physical grinding, meanwhile, in the coarse pulping process, the dissolving auxiliary materials and the medium-strength acid liquor can quickly dissolve the substances such as printing ink, grease, metal powder, cement, residual sludge and the like in the fiber blocks which are still coagulated into blocks in the paper pulp, the pulping process is accelerated, the pulping time can be shortened to 2 minutes, the oily substances, silt and the like attached to the surfaces of the fibers can be quickly removed under good control, and the surface of the fibers can be roughened without damaging the main body of the fibers by controlling the adding proportion of the dissolving auxiliary materials and the medium-strength acid liquor, namely all the medium-strength acid liquor is consumed by reaction before the medium-strength acid liquor contacts the main body of the fibers.
The lower part of the pulp inlet is provided with unpowered driven passive rotating dispersion pulp, the conditioning pulp freely impacts the dispersion pulp after being flushed into the pulp inlet, the conditioning pulp is dispersed and splashed around in different directions and quickly flies to the blunt-tooth millstone below the pulping chamber through the dispersion pulp, and by means of the method, medium-strength acid liquid which is just added into the conditioning pulp is quickly dispersed into the conditioning pulp within 1-3 seconds, the medium-strength acid liquid is prevented from excessively contacting with fibers in the conditioning pulp, and the medium-strength acid liquid is prevented from being corroded and damaging the fibers in the medium-strength acid liquid by controlling and reducing the contact time of the medium-strength acid liquid and the fibers in the conditioning pulp. Specifically, the disperse pulp comprises an outer rotating ring in a circular ring shape and a plurality of arc-shaped blades which are fixed on the inner side of the outer rotating ring and arranged at intervals along the circumferential direction, the inner ends of the blades are respectively connected to the middle position of the outer rotating ring, the outer ends of the blades are respectively connected to the outer rotating ring, a bearing is installed on the inner wall of a pulp inlet, the outer rotating ring is installed on the bearing, the disperse pulp can rotate freely without being driven by power to rotate, the disperse pulp rotates by means of impact of conditioning pulp, the disperse pulp runs unpowered, and the disperse pulp runs simply, stably and reliably.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (9)
1. A production method for reconstructing corrugated medium paper by using waste paper for improving pulping and pulping processes is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp, discharging heavy slag through a heavy slag discharging port arranged at the bottom of the pulping barrel, separating the heavy slag into sewage and sludge, pumping the sewage into a sewage treatment workshop for treatment, and pumping the sludge into a sludge treatment workshop for treatment;
a hydraulic impurity removal step, namely pumping the waste paper raw pulp to a high-frequency vibrating screen through a pulp pump for hydraulic impurity removal treatment, and screening and separating impurities;
a first precipitation step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a first sand settling plate for precipitation treatment, and separating impurities to obtain raw pulp;
a first low-concentration desanding step, namely pumping the raw slurry to a first low-concentration desander for low-concentration desanding treatment;
a pulp washing step, namely pumping the raw pulp subjected to the first low-concentration desanding treatment to a pulp washer for pulp washing treatment, and pumping the raw pulp to a pulp forming pool for later use to obtain primary pulp;
a step of pre-treatment of pulping, which is to pump primary pulp to a coarse pulp grinder through a pump material pipeline, and to perform pulp conditioning treatment in the process of pumping, firstly pump 1-5% of an abrasion-resistant agent, 0.2-2% of a surfactant and 0.2-2% of a dissolving auxiliary material in the front section of the pump material pipeline according to weight percentage, then pump 0.5-5% of a medium-strength acid liquid with the mass concentration of 10-50% in the rear section of the pump material pipeline according to weight percentage, form conditioning pulp at the front end of a pulp inlet of the coarse pulp grinder and pump the conditioning pulp into the coarse pulp grinder;
a coarse pulping step, namely, performing short-time coarse pulping treatment only once on the conditioning pulp pumped into the coarse pulping machine through the coarse pulping machine, wherein a comb-tooth-shaped blunt-tooth grinding disc is selected for the coarse pulping machine used in the short-time coarse pulping treatment process, the pulping clearance of the upper blunt-tooth grinding disc and the lower blunt-tooth grinding disc is controlled to be 0.5-2mm, the pulping time of the conditioning pulp staying in the coarse pulping machine is controlled to be 1-5 minutes, and the conditioning pulp is pumped out through a pulp outlet of the coarse pulping machine to obtain coarse pulping pulp;
a second low-concentration desanding step, namely pumping the coarse grinding slurry to a second low-concentration desander for low-concentration desanding treatment;
a second precipitation step, namely pumping the coarse grinding slurry subjected to the second low-concentration desanding treatment to a second sand setting table for precipitation treatment and separating impurities;
flotation deinking, namely performing flotation deinking treatment on the coarse grinding pulp subjected to precipitation treatment to obtain pure pulp;
a concentration step, pumping the pure pulp subjected to flotation deinking treatment to a thickener for concentration treatment, washing the slurry by the thickener and improving the slurry concentration of the pure pulp;
a high-concentration filter pressing step, namely conveying the concentrated pure slurry to a high-concentration filter press and performing high-concentration filter pressing only once;
a pulp mixing and proportioning step, namely pumping the pure pulp subjected to high-concentration filter pressing treatment to a pressure proportioning box, and adjusting and stabilizing the concentration of the pulp to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
and a subsequent step of paper formation, namely performing press polishing treatment, rewinding treatment, slitting treatment and packaging treatment on the press polished corrugated medium paper to obtain the corrugated medium paper.
2. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 1, wherein the method comprises the following steps: before the pulp mixing and blending step, sequentially carrying out only one pulping step, one hydraulic impurity removal step, one first precipitation step, one first low-concentration sand removal step, one pulp washing step, one pulp grinding pretreatment step, one rough pulp grinding treatment step, one second low-concentration sand removal step, one second precipitation step, one flotation deinking step, one concentration step and one high-concentration pressure filtration step.
3. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 2, wherein the method comprises the following steps: in the step of pretreatment before pulping, the wear-resistant agent, the surfactant and the dissolving auxiliary material are pumped into a mixing barrel according to the weight percentage, the materials are uniformly mixed by a stirrer arranged in the mixing barrel to obtain mixed materials, the mixed materials are quantitatively pumped into a first mixing pipe according to the weight percentage by a first quantitative pump, the tail end of the first mixing pipe is connected to the front section of a pump material pipeline, the mixed materials are mixed into the conditioned pulp at the front section of the pump material pipeline, and the mixed materials are uniformly distributed in the conditioned pulp through turbulence generated in the pump material pipeline in the forward conveying process of the conditioned pulp; the coarse pulping machine is provided with a pulping chamber, a vertically arranged pulp inlet is arranged above the pulping chamber, the distance between the pulp inlet and the blunt tooth grinding disc is set to be 10-20cm, the rear section of a pump material pipeline is connected to the upper part of the pulp inlet, the medium-strength acid liquid is quantitatively pumped to the pump material pipeline at the pulp inlet through a second quantitative pump according to the weight percentage, and the retention time of the medium-strength acid liquid in the conditioning pulp is controlled for 1-3 seconds before the conditioning pulp enters the pulping chamber.
4. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 3, wherein the method comprises the following steps: in the step of pretreatment of pulping, 1-2% of the medium-strength acid solution is pumped according to the weight percentage, and the mass concentration of the selected medium-strength acid solution is controlled at 20-30%.
5. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 4, wherein the method comprises the following steps: the dissolving auxiliary materials comprise at least two of alkyl amine oxide, sodium carbonate, calcium carbonate, sodium hypochlorite, calcium hypochlorite and hydroxide.
6. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 5, wherein the method comprises the following steps: the surfactant is at least one of hydroxyl compounds, ethers and ether alcohols, pyridines and ketones.
7. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 6, wherein the method comprises the following steps: the medium strong acid solution comprises at least one of phosphoric acid, tartaric acid, sulfurous acid, pyruvic acid, oxalic acid and nitrous acid.
8. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process according to any one of claims 3 to 7, wherein the method comprises the following steps: the lower part of the pulp inlet is provided with passive rotating dispersed pulp which is not driven by power, the conditioned pulp freely impacts the dispersed pulp after being flushed into the pulp inlet, and the conditioned pulp is dispersed and splashed around in different directions and accelerated to fly to the blunt-tooth grinding disc below the pulping chamber through the dispersed pulp.
9. The method for producing the corrugated medium paper by using the waste paper for the improvement of the pulping and refining process as claimed in claim 8, wherein the method comprises the following steps: the dispersing pulp comprises an outer rotating ring in a circular ring shape and a plurality of arc-shaped blades fixed on the inner side of the outer rotating ring and arranged at intervals along the circumferential direction, the inner end of each blade is connected to the middle position of the outer rotating ring respectively, the outer end of each blade is connected to the outer rotating ring respectively, a bearing is installed on the inner wall of the pulp inlet, and the outer rotating ring is installed on the bearing and enables the dispersing pulp to rotate freely.
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| CN113605132A (en) * | 2021-07-12 | 2021-11-05 | 东莞顺裕纸业有限公司 | Production process of waste paper reconstituted corrugated medium paper for improving fiber recovery rate |
| CN116122071A (en) * | 2023-02-14 | 2023-05-16 | 杭州富伦生态科技有限公司 | Method for preparing base paper by using low-value recyclable material |
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