CN107938421B - Recycled paper manufacturing method and recycled paper - Google Patents
Recycled paper manufacturing method and recycled paper Download PDFInfo
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- CN107938421B CN107938421B CN201711145865.7A CN201711145865A CN107938421B CN 107938421 B CN107938421 B CN 107938421B CN 201711145865 A CN201711145865 A CN 201711145865A CN 107938421 B CN107938421 B CN 107938421B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 239000010893 paper waste Substances 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 21
- 238000004537 pulping Methods 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 18
- 239000012792 core layer Substances 0.000 claims abstract description 17
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- 238000000227 grinding Methods 0.000 claims abstract description 13
- 239000002761 deinking Substances 0.000 claims abstract description 12
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- 239000003292 glue Substances 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 5
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Classifications
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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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/12—Coating on the layer surface on paper layer
-
- 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
Abstract
The invention discloses a method for manufacturing recycled paper and the recycled paper, the manufacturing method comprises the following steps: conveying the waste paper raw material to a pulper for pulping, and discharging the adhesive outside to obtain slurry, wherein the slurry comprises deinking slurry for manufacturing a surface layer and a core layer and bottom slurry for manufacturing a bottom layer; adopting a grading sieve to carry out coarse screening and fine screening on the slurry, controlling the temperature of the fine screening to be between 40 and 45 ℃, and removing sticky particles in the slurry; grinding the slurry, and thinning and dispersing the adhesive substances in the slurry; removing fine stickies by flotation; dehydrating and molding the pulp through a molding net, and compounding and compacting the obtained paper surface layer, the paper core layer and the paper bottom layer into a whole to prepare paper web; conveying the paper web to a drying system for drying; filling pores on the surface of the paper web with glue solution, and pretreating the surface of the paper web; the temperature is controlled between 30 ℃ and 40 ℃, the paper web is cooled through a cold cylinder system, the content of stickies in the slurry is reduced, and the shape of the stickies in the paper web is controlled.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for manufacturing recycled paper and the recycled paper.
Background
Recycling one ton of waste paper can produce 0.8 ton of good paper, and 17 trees are cut less; the utilization of one ton of waste paper pulp can: 3-5 cubic meters of wood, 1.0-1.5 tons of coal, 30-100 cubic meters of water and 300-800 kilograms of chemical raw materials are saved, air pollution is reduced by 75%, water pollution is reduced by 35%, and 3 cubic meters of space of a refuse landfill are saved. Because the significance of waste paper utilization is so important, in recent years, the utilization rate of waste paper in China is greatly improved, and particularly, green packaging with paper replacing wood and paper replacing metal is a development trend and is more and more favored by consumers.
The waste paper recycling and utilization is continuously developed, and a large amount of impurities are brought into the system while the waste paper is recycled. Therefore, a key operation in the recycling process of recycled paper produced from 100% total waste paper is to effectively remove these impurities, some of which remain in the process and cause deposition problems.
The stickies are the most complicated, difficult and serious problems in the process of treating the recycled waste paper, are difficult to remove and can be deposited on mechanical equipment to prevent the mechanical equipment from normally operating; stickies can be deposited on the forming net to block the meshes, so that the water filtration is difficult, and the cleaning time is prolonged; stickies can remain in the paper, causing paper stains, breaks or forming paper holes, and making the paper easily break, therefore, the stickies not only affect the paper making process, but also affect the quality of finished products.
Disclosure of Invention
The invention aims to provide a method for manufacturing recycled paper, which aims to solve the technical problems that stickies are difficult to remove, normal production is influenced and the quality of paper is reduced in the prior art.
The invention also aims to provide recycled paper, and the method for manufacturing the recycled paper is adopted to solve the technical problems that the sticky substances are difficult to remove, the paper is stained and easy to break in the prior art.
As the conception, the technical scheme adopted by the invention is as follows:
a recycled paper manufacturing method comprising:
pulping, namely conveying the waste paper raw material to a pulper for pulping, and discharging the adhesive outside to obtain pulp, wherein the pulp comprises deinking pulp for manufacturing a surface layer and a core layer and bottom pulp for manufacturing a bottom layer;
screening, namely adopting a grading screen to carry out coarse screening and fine screening on the slurry, controlling the temperature of the fine screening to be between 40 and 45 ℃, and removing sticky particles in the slurry;
performing thermal dispersion, namely grinding the slurry, and refining and dispersing adhesive substances in the slurry;
flotation, so that fine stickies are suspended and removed;
forming, namely dehydrating and forming the pulp through a forming net to obtain a paper surface layer, a paper core layer and a paper bottom layer;
pressing, namely combining the paper surface layer, the paper core layer and the paper bottom layer into a whole and compacting to prepare a paper web;
drying, namely conveying the paper web to a drying system for drying;
sizing, namely filling surface pores of the paper web with glue solution to pretreat the surface of the paper web;
and cooling, controlling the temperature to be between 30 and 40 ℃, and cooling the paper web through a cold cylinder system.
The deinking pulp is prepared by using the drum pulper, the waste paper raw materials are lifted by rotating the drum, and then fall by the gravity of the waste paper, and the waste paper raw materials are repeatedly lifted and fallen to be pulped into paper pulp.
Wherein the concentration of deinked pulp is 15-22%, the temperature is 50-60 ℃ and the pH value is 9.5-11.
Wherein, the screening comprises a coarse screen, a first-level fine screen and a second-level fine screen, the coarse screen adopts a pressure screen with a seam width of 0.30mm-0.5mm, and the first-level fine screen adopts a pressure screen with a seam width of 0.13mm-0.16 mm; the secondary fine screen adopts a pressure screen with a seam width of 0.11mm-0.13 mm.
Wherein a bottom pulp is prepared by means of a hydropulper.
Wherein, the screening comprises a coarse screen and a fine screen, the coarse screen adopts a pressure screen with a seam width of 0.5mm-0.7mm, and the fine screen adopts a pressure screen with a seam width of 0.13mm-0.16 mm.
Wherein the heat dispersion is carried out by grinding with a tooth height of 25mm-27 mm.
The grinding disc comprises a plurality of grinding teeth, a dam is arranged between every two adjacent grinding teeth, and the height of the dam is 70% -80% of the height of the grinding teeth.
Wherein, before pulping, the waste paper raw material is sorted.
The recycled paper is manufactured by the recycled paper manufacturing method, the deinked pulp is used for manufacturing a surface layer and a core layer of the recycled paper, and the bottom pulp is used for manufacturing a bottom layer of the recycled paper.
The method for manufacturing the recycled paper provided by the invention has the advantages that large-particle stickies are discharged outside through the pulper in the pulping stage, the stickies are prevented from softening and passing through screen seams by controlling the temperature of the fine screen to be 40-45 ℃ in the screening stage, the removal rate of the stickies is improved, and large-particle stickies and small-particle stickies in the pulp are removed by adopting the grading screen; in the thermal dispersion stage, grinding the slurry to finely disperse the adhesive in the slurry; in the flotation stage, removing fine stickies; finally, during cooling, the temperature is controlled to be between 30 and 40 ℃, the stable quality of the paper is ensured through cooling, and the mutual transfer of stickies on the paper web is avoided during reeling; through the comprehensive application of the technical means, the content of stickies in the pulp is reduced, the form of the stickies in the paper web is controlled, and the influence of the stickies on the operation of a paper machine and the quality of finished paper is reduced.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
The embodiment of the invention provides a method for manufacturing recycled paper, which is mainly used for removing and controlling stickies in the process of manufacturing the recycled paper and producing the recycled paper with high cleanliness. The recycled paper comprises a surface layer, a core layer and a bottom layer, wherein the surface layer and the core layer are made of 100% office waste paper deinking pulp, and the bottom layer is made of 100% corrugated case waste paper bottom pulp.
First, the waste paper raw material is sorted. The deinking pulp slurry line uses cleaner waste paper, selects out book paper, and prohibits the book paper with adhesive edges; the bottom pulp line is stable and uniform in using quality, clean and good in fiber strength of the waste paper, physical indexes of finished paper, such as bursting index, ring crush index, folding strength and the like, can be effectively guaranteed, the waste paper of various specifications can be matched for use, the strength is met, the stable quality of raw materials is guaranteed, and the content of sticky matters is reduced; the content of the adhesive is detected for the waste paper raw materials purchased in each batch, the raw material proportion is updated and optimized once every month, and when the waste paper raw materials with low adhesive content are selected and used, the amount of the adhesive entering the system is reduced from the source.
The deinked pulp and the ground pulp are produced by different production lines, which are described below separately.
The process for preparing the deinking pulp comprises the following steps: mixed office waste paper → loading chain plate → pulper → pulp tank → high consistency desander → pulp tank → coarse screen → pulp tank → primary fine screen → pulp tank → primary flotation → low consistency positive desander → pulp tank → secondary fine screen → concentration → primary heat dispersion → pulp tank → secondary flotation → concentration → secondary heat dispersion → pulp tank → tertiary flotation → concentration → bleaching → pulp making tower → pulping tank → paper machine loading system
The deinking pulp is used as surface layer and core layer pulp, and heavy impurities are removed by high-concentration desanding and low-concentration desanding; the first-stage fine screen is a medium-concentration fine screen, the second-stage fine screen is a low-concentration fine screen, and the coarse screen, the medium-concentration fine screen and the low-concentration fine screen remove impurities with larger volume; first-stage flotation, second-stage flotation and third-stage flotation are carried out to remove ink and fine impurities in the slurry, and the third-stage flotation is low-concentration flotation; two-stage bleaching ensures the whiteness of the pulp.
In the pulping stage, a rotary drum continuous type pulping machine is selected as the pulping machine, the rotary drum pulping machine is mild in pulping, small in damage to impurities and small in abrasion to subsequent equipment. The impurities are kept in a larger form in the pulping section and are not crushed, and a large amount of large impurities and stickies are discharged at the residue discharge outlet of the drum pulper.
The deinking pulp is prepared by the drum pulper, the waste paper raw materials are lifted to a certain height through the rotation of the drum, and then fall by the gravity of the waste paper, and are repeatedly lifted and fallen, so that the waste paper raw materials are beaten and are disintegrated into paper pulp. The concentration of the deinked pulp is 15 to 22 percent (mass percent), the temperature is 50 to 60 ℃, and the pH value is 9.5 to 11. And the mild pulping reduces the cutting of fibers, keeps the integrity of impurities in the waste paper, can remove more impurities in a screening area of the pulper and reduces the abrasion of subsequent equipment. The replacement period of the equipment is reduced, and the effects of energy conservation and consumption reduction are achieved. The proper pulping temperature not only ensures the fiber to be swelled and defibered, but also does not cause the excessive softening of the stickies in the raw materials and does not influence the removal of subsequent equipment.
When the primary fine screening and the secondary fine screening are carried out, the temperature of the system is below 45 ℃, particularly can be between 40 ℃ and 45 ℃, the lower temperature is kept, the sticky matters are prevented from softening and passing through the screen gaps, and the removal rate of the sticky matters is improved.
The coarse screen adopts a pressure screen with a seam width of 0.30mm-0.5mm to remove large sticky substances, and the primary fine screen adopts a pressure screen with a seam width of 0.13mm-0.16mm to further remove sticky substance particles in the slurry; and the secondary fine screen adopts a pressure screen with a seam width of 0.11mm-0.13mm to remove small-particle stickies.
The grinding disc with the tooth height of 25mm-27mm is adopted for primary heat dispersion and secondary heat dispersion, the grinding tooth height adopted for heat dispersion in a general papermaking and pulping workshop is 15mm-23mm, the high-tooth grinding disc can improve the processing time of pulp in a grinding area, and stickies in the pulp are better dispersed into fine particles, so that the removal and purification system are convenient.
The flotation is to process the slurry, and compressed air is introduced into the slurry to suspend fine sticky matters on the surface of the slurry, and the slurry is scraped away by a scraper to remove the sticky matters.
The white water in the paper making process is treated by air flotation. 100% of multi-disk clear water is subjected to air floatation treatment, a flocculating agent is added at an air floatation inlet to flocculate fine sticky matters and fillers in the white water, compressed air is added simultaneously to float the flocculated fine sticky matters and fillers in the white water out of a liquid surface by utilizing bubble adhesion, a floating sludge discharge system is discharged by utilizing a water scraping plate of an air floatation machine, and the treated water is recycled to a sizing line.
During air floatation operation, sampling water in and out once every set time, monitoring the air floatation treatment effect and ensuring the removal of stickies; compressed air is added into the air flotation inlet, and the proper air inflow can ensure that stickies flocculated in the white water are taken out of the system and discharged. Pressure at the outlet of the dissolved air pump: 586KPa-723KPa, to ensure the pressure release when the white water added with compressed air at the air dissolving pump outlet enters the air floating inlet, thereby generating a large amount of fine bubbles. The flocculating agent is polyacrylamide, and the addition amount is as follows: 3PPM-6PPM, ensuring flocculation effect; during air floatation treatment, rich fine foams are adhered to the liquid surface to make paper fillers, fibers float, and floating sludge can overflow normally, so that the air floatation effect is ensured. The white water after air floatation treatment has the solid suspension removal rate of more than 80 percent and the sticky matter removal rate of more than 75 percent, and effectively purifies the white water. In this example, the set time was 8 hours, and the compressed air amount was 0.5% of the intake water volume, which is not limited herein.
The process for preparing the bottom slurry comprises the following steps: waste paper material → chain board machine → hydropulper → pulp tank → high consistency desander → coarse screen → pulp tank → low consistency positive desander → fine screen → multi-disc thickener → heat dispersion → pulp tank → disc mill pulping → pulp tank → paper machine feeding system
The temperature of the fine screen control system is below 45 ℃, particularly between 40 ℃ and 45 ℃, the temperature is kept low, the sticky matters are prevented from softening and passing through screen gaps, and the removal rate of the sticky matters is improved.
The coarse screen adopts a pressure screen with a seam width of 0.5mm-0.7mm to remove large sticky substances; for guaranteeing coarse screen normal use, the inside welding vortex strip plays and consolidates the screen cylinder stick strip, guarantees the homogeneous of every screen cut width, guarantees good screening effect. The fine screen adopts a pressure screen with a seam width of 0.13mm-0.16mm to further remove sticky particles in the slurry; the fine screen uses many rotor, and traditional pressure sieve rotor is 6 rotors, and in this embodiment, many rotor are 24 rotors, and under same handling capacity, pressure differential is little, and pressure differential is below 15KPa during normal production, and the sticky thing is difficult to pass through the screen cut, and the sticky thing clearance is higher, and the clearance is at 90% -96%.
A dam is arranged between adjacent grinding teeth of the grinding sheet for heat dispersion, and the height of the dam is 70-80% of the height of the grinding teeth. The dam blocking design can effectively prolong the retention time of the slurry in the grinding area, increase the kneading and dispersing effects on the fibers and improve the efficiency; after thermal dispersion, the removal rate of stickies is 60-70%, the improvement range of the burst index of finished paper is 5-10% higher than that of a common abrasive disc, and the removal rate of dust is 10-20% higher than that of the common abrasive disc.
And after the deinking pulp and the bottom pulp are manufactured, conveying the deinking pulp and the bottom pulp to a feeding system of a paper machine.
The paper machine flow comprises the following steps: paper machine feeding system → three-layer fourdrinier paper machine → primary press → secondary press → tertiary press → six groups of cylinder drying system → hard press → glue applicator → hot air drying system → two groups of cylinder drying system → soft press → drying cylinder → cold cylinder → coiling
Forming nets are arranged on the three-layer fourdrinier paper machine, so that the pulp is dehydrated and formed to obtain a paper surface layer, a paper core layer and a paper bottom layer; after the forming of the net, 100 percent of net white water recycled from the surface layer, the core layer and the bottom layer is subjected to air floatation treatment, and fine adhesive substances and fillers in the white water are floated out.
The first-stage pressing and the second-stage pressing are shoe pressing, the third-stage pressing is smooth pressing, and the paper surface layer, the paper core layer and the paper bottom layer are compounded into a whole and compacted to form the paper web. Use the shower water in compression roller department, keep the roll surface moist, add the separant in the shower water, can not adhere sticky thing and wool to the roll surface when guaranteeing the paper web contact roll surface, avoid sticky thing to flocculate at the roll surface deposit, the separant forms the protection film at the paper surface simultaneously, after the paper web enters into drying system, sticky thing in the paper web loses viscidity, do not deposit at drying system, avoid sticky thing to flocculate, reduce the influence to finished product quality, reduce the influence paper machine operation that leads to because of sticky thing flocculation.
In the sizing stage, the sizing machine adopts a sizing mode combining a soaking mode and a rod scraping mode, so that the high sizing amount of the back surface is ensured while the uniformity of sizing on the front surface is improved, the water resistance is improved, the surface of the paper web is sealed, and the separation of sticky matters is reduced. The glue solution is made of high-performance tapioca starch which has better film forming property than common corn starch and is uniformly distributed on the surface of the paper web. The glue solution is utilized to pretreat the paper surface, the starch film fills the surface pores of the paper web, and the pore diameter of the micropores is reduced, so that the penetration of liquid is reduced, the water resistance of the paper surface is improved, the printing performance is improved, hair and powder falling are prevented, the paper web surface is sealed, and the separation of sticky matters is reduced.
Because of the body paper uses the primer, contain the sticky, the inside sticky of paper web stoving back is appeared, and the paper web is not fully cooled down before the batching, causes the sticky of appearing to have certain stickness, shifts to adhere to openly. The problem is particularly acute in summer or when the ambient temperature is high. To solve this problem, a cold cylinder system is installed before reeling, and after the web has been cooled by the cold cylinder system, the web temperature is controlled to be kept below 40 ℃. The lower web temperature can maintain the temperature of the finished paper quality while avoiding the mutual transfer of stickies on the web. In this embodiment, the web temperature is controlled between 30 ℃ and 40 ℃.
In conclusion, the production process is optimized by adopting specific methods of optimizing raw material proportion, low-temperature pulping, low-temperature screening, optimizing a pressure screen, efficiently air-floating, controlling the temperature of the roll paper and the like, the content of stickies in the pulp and the white water is reduced, the shape of the stickies in the paper web is controlled, and the influence of the stickies on the operation of a paper machine and the quality of finished paper is reduced.
The embodiment of the invention also provides recycled paper, and the method for manufacturing the recycled paper comprises a surface layer and a core layer which are made of deinking pulp, and a bottom layer which is made of bottom pulp. The content of adhesive in the recycled paper is low, and the paper is cleaner and not easy to break. In this example, the weight of the produced recycled paper was 126g/m2～200g/m2。
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A recycled paper manufacturing method, comprising:
pulping, namely conveying the waste paper raw material to a pulper for pulping, and discharging the adhesive outside to obtain pulp, wherein the pulp comprises deinking pulp for manufacturing a surface layer and a core layer and bottom pulp for manufacturing a bottom layer;
screening, namely adopting a grading screen to carry out coarse screening and fine screening on the slurry, controlling the temperature of the fine screening to be between 40 and 45 ℃, and removing sticky particles in the slurry;
performing thermal dispersion, namely grinding the slurry, and refining and dispersing adhesive substances in the slurry;
flotation, so that fine stickies are suspended and removed;
forming, namely dehydrating and forming the pulp through a forming net to obtain a paper surface layer, a paper core layer and a paper bottom layer;
pressing, namely combining the paper surface layer, the paper core layer and the paper bottom layer into a whole and compacting to prepare a paper web;
drying, namely conveying the paper web to a drying system for drying;
sizing, namely filling surface pores of the paper web with glue solution to pretreat the surface of the paper web;
cooling, controlling the temperature between 30 ℃ and 40 ℃, and cooling the paper web through a cold cylinder system;
the grinding sheet with the tooth height of 25mm-27mm is adopted for heat dispersion, the grinding sheet comprises a plurality of grinding teeth, a dam is arranged between every two adjacent grinding teeth, and the height of the dam is 70% -80% of the height of the grinding teeth.
2. The recycled paper manufacturing method of claim 1, wherein deinked pulp is produced by a drum pulper, the used paper raw material is lifted by rotation of the drum, and the used paper is dropped by gravity of the used paper itself, and the lifting and dropping are repeated to break the used paper raw material into pulp.
3. The process for producing recycled paper as claimed in claim 2, wherein the deinked pulp has a concentration of 15% to 22%, a temperature of 50 ℃ to 60 ℃ and a pH of 9.5 to 11.
4. The recycled paper manufacturing method of claim 2, wherein the screening comprises a coarse screen, a primary fine screen and a secondary fine screen, the coarse screen adopts a pressure screen with a seam width of 0.30mm-0.5mm, and the primary fine screen adopts a pressure screen with a seam width of 0.13mm-0.16 mm; the secondary fine screen adopts a pressure screen with a seam width of 0.11mm-0.13 mm.
5. The recycled paper manufacturing method of claim 1, wherein the bottom pulp is prepared using a hydropulper.
6. The recycled paper manufacturing method of claim 5, wherein the screening comprises a coarse screen and a fine screen, the coarse screen adopts a pressure screen with a slit width of 0.5mm-0.7mm, and the fine screen adopts a pressure screen with a slit width of 0.13mm-0.16 mm.
7. The recycled paper manufacturing method of any one of claims 1 to 6, wherein the used paper raw material is sorted before pulping.
8. Recycled paper, which is produced by the recycled paper production method according to any one of claims 1 to 7, wherein the deinked pulp is used for producing a surface layer and a core layer of the recycled paper, and the ground pulp is used for producing a bottom layer of the recycled paper.
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| CN109574117B (en) * | 2018-12-29 | 2021-08-06 | 玖龙纸业（东莞）有限公司 | Water-saving reconstruction system and method for production process of recycled cultural paper |
| CN115538208B (en) * | 2022-10-08 | 2023-11-24 | 江西省芦林纸业股份有限公司 | Preparation process of environment-friendly recycled paper |
| CN115748283B (en) * | 2022-11-10 | 2024-03-15 | 中国矿业大学 | Fiber regeneration and sticky recycling and utilizing method |
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Application publication date: 20180420 Assignee: Nine dragon intelligent packaging (Dongguan) Co.,Ltd. Assignor: NINE DRAGONS PAPER INDUSTRIES (DONGGUAN) Co.,Ltd. Contract record no.: X2024980003544 Denomination of invention: A method for manufacturing recycled paper and recycled paper Granted publication date: 20200724 License type: Common License Record date: 20240328 |