CN116536968A - Method for manufacturing high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping - Google Patents
Method for manufacturing high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping Download PDFInfo
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- CN116536968A CN116536968A CN202310363003.0A CN202310363003A CN116536968A CN 116536968 A CN116536968 A CN 116536968A CN 202310363003 A CN202310363003 A CN 202310363003A CN 116536968 A CN116536968 A CN 116536968A
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- 238000004537 pulping Methods 0.000 title claims abstract description 64
- 239000010893 paper waste Substances 0.000 title claims abstract description 61
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000002156 mixing Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 137
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 76
- 238000010009 beating Methods 0.000 claims abstract description 72
- 238000000227 grinding Methods 0.000 claims abstract description 57
- 239000002994 raw material Substances 0.000 claims abstract description 46
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000012216 screening Methods 0.000 claims abstract description 26
- 238000004513 sizing Methods 0.000 claims abstract description 26
- 239000002023 wood Substances 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 22
- 239000002699 waste material Substances 0.000 claims abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 14
- 239000002562 thickening agent Substances 0.000 claims abstract description 13
- 238000003490 calendering Methods 0.000 claims abstract description 7
- 238000010025 steaming Methods 0.000 claims abstract description 7
- 239000000123 paper Substances 0.000 claims description 93
- 239000002002 slurry Substances 0.000 claims description 77
- 239000012792 core layer Substances 0.000 claims description 36
- 239000010410 layer Substances 0.000 claims description 34
- 229920002472 Starch Polymers 0.000 claims description 27
- 235000019698 starch Nutrition 0.000 claims description 27
- 239000008107 starch Substances 0.000 claims description 27
- 239000002344 surface layer Substances 0.000 claims description 27
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 238000002360 preparation method Methods 0.000 claims description 17
- 239000011268 mixed slurry Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000012744 reinforcing agent Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000013055 pulp slurry Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 240000003183 Manihot esculenta Species 0.000 claims description 3
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- -1 steaming Substances 0.000 claims description 3
- 230000009172 bursting Effects 0.000 description 18
- 230000000694 effects Effects 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 3
- 206010061592 cardiac fibrillation Diseases 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000010791 domestic waste Substances 0.000 description 3
- 230000002600 fibrillogenic effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 206010006514 bruxism Diseases 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
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- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- 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
- D21H27/10—Packing 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
-
- 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
- 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
-
- 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
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/005—Mechanical treatment
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a method for manufacturing high-grade packaging paper by mixing and pulping high-grade pulp and waste paper, which comprises the following steps: preparing OCC waste paper pulp, sequentially carrying out disintegration, deslagging, coarse screening and classifying screening on the national waste OCC to form long, medium and short fiber pulp, and sequentially passing through a slag remover, a fine screening, a multi-disc thickener, a heat dispersion, a pre-beating pool and a disc grinding pool; preparing natural wood pulp, crushing the purchased commodity wood pulp raw material, pulping by disc mill, and then entering a post-beating pool; preparing Gao Kajiang, namely sequentially washing and presoaking wood chip raw materials, steaming, carrying out medium concentration grinding, screening and purifying, washing and concentrating to form high-calorie pulp, and mixing and pulping the high-calorie pulp with long fiber pulp and short fiber pulp to form high-length mixed pulp and high-short mixed pulp; and finally, respectively throwing the prepared natural wood pulp, medium fiber pulp, high-length mixed pulp and high-length mixed pulp into a surface/core/bottom layer paper machine mixed pulp pond, removing impurities, conveying to a surface/core/bottom layer net part for papermaking, and then carrying out pressing part, pre-drying, sizing, post-drying, calendaring and reeling to prepare the high-grade packaging paper.
Description
Technical field:
the invention relates to the technical field of papermaking, in particular to a method for manufacturing high-grade packaging paper by mixing high-grade pulp with waste paper and pulping.
The background technology is as follows:
at present, the raw materials used for the national waste high-grade packaging paper are mainly imported waste paper and are matched with a small amount of domestic waste paper and natural wood pulp, but with the implementation of the national environmental protection policy deepening, the imported waste paper (namely the imported waste paper) is stopped, so that the national waste paper and the wood pulp are in shortage, and the consumption of the national waste paper and the wood pulp is increased. Because most imported waste paper is made of virgin wood pulp, the strength of the finished paper is higher than that of domestic waste paper, but after the consumption of the domestic waste paper is increased, the strength of the finished paper is difficult to meet the requirement of high-grade packaging paper.
To improve the strength of the wrapping paper, wood pulp is used in a large amount, resulting in an increase in production cost. In order to adapt to market change, enhance enterprise competitiveness, reduce enterprise production cost, research new raw materials replace imported waste paper, and produce high-quality and low-cost high-grade packaging paper, the method is an urgent task facing at present.
In view of this, the present inventors have proposed the following means.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art and provides a method for manufacturing high-grade packaging paper by mixing and pulping high-grade pulp and waste paper.
In order to solve the technical problems, the invention adopts the following technical scheme: gao Kajiang and waste paper are mixed and beaten to manufacture high-grade packaging paper, and the method comprises the following steps: s001: preparation of OCC waste paper pulp: sequentially carrying out disintegration, deslagging, coarse screening and classifying screening on the national waste OCC to form long fiber pulp, medium fiber pulp and short fiber pulp, and sequentially passing the long fiber pulp obtained by the classifying screening through a slag remover, a fine screening, a multi-disc thickener, a heat dispersion, a long fiber beating front tank and a disc grinding rear tank; sequentially passing the medium fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, a heat dispersing and medium fiber beating front tank and a disc grinding rear tank; sequentially passing long fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, heat dispersion, a short fiber beating front tank and a disc grinding rear tank; s002: preparing natural wood pulp: crushing the purchased commodity wood pulp raw material by a hydropulper, pulping by a disc mill, and then entering a post-beating pool; s003: preparation Gao Kajiang: sequentially washing and presoaking wood chip raw materials, steaming, medium concentration grinding, screening, purifying, washing and concentrating to form high-calorie pulp, storing in a pulp tower, adding the high-calorie pulp into a long fiber beating front tank and a short fiber beating front tank in the step S001 through low concentration disc grinding for primary beating, mixing and beating the high-calorie pulp and the long fiber pulp to form high-length mixed pulp, and then entering a long fiber beating rear tank; the high-short mixed pulp formed after the high-calorie pulp and the short fiber pulp are mixed and pulped enters a short fiber beating back pool: s004: paper machine production: putting natural wood pulp and medium fiber pulp into a surface paper machine mixed pulp pool, removing impurities, and then delivering the mixture to a surface net part through a surface layer pulp box; the high-length mixed pulp, the medium-fiber pulp and the high-short mixed pulp are put into a mixed pulp tank of a core layer paper machine, impurities are removed, and the mixed pulp is sent to a core layer net part through a core layer pulp tank; the high-length mixed pulp and the high-length mixed pulp are put into a mixed pulp tank of a bottom paper machine, impurities are removed, and the mixed pulp is sent to a bottom net part through a bottom layer pulp box; the surface layer, the core layer and the bottom layer sizing agent are dehydrated and formed by a net part to form a wet paper web, and the three layers of sizing agents are compounded together and then pass through a pressing part, pre-drying, sizing, post-drying, calendaring and coiling to prepare the high-grade packaging paper.
Further, in the above technical scheme, in step S003, the specific preparation process of the high-calorie slurry is as follows: after the wood chip raw materials are presoaked by washing, the wood chip raw materials are steamed by a digester to dissolve lignin in the wood chip raw materials, fibers in the wood chip raw materials are separated into paper pulp, the paper pulp is pulped by a medium consistency mill, the wood chip fibers are fibrillated and dissociated into single fibers and fiber bundles, then the large fiber bundles, sand grains and metal particle impurities in the wood chip raw materials are removed by screening and purifying equipment, and finally the cleanliness and the concentration of the paper pulp are improved by washing and concentration, so that high-calorie pulp meeting the quality requirements is prepared and stored in a pulp tower.
In the above technical scheme, in step S003, when the prepared high-calorie pulp, imported waste paper and national waste paper are beaten to have the same beating degree of 30 ° SR, the burst strength is measured by sheet making, the burst strength of the high-calorie pulp is 3.84 Kpa/g, the burst strength of the imported waste paper is 2.78 Kpa/square meter/g, the burst strength of the national waste paper is 1.8 Kpa/g, i.e. the burst strength of Gao Kajiang is 38% higher than the burst strength of the imported waste paper and 113% higher than the burst strength of the national waste paper.
In the above technical scheme, in step S003, the high-calorie slurry in the high-length slurry mixture accounts for 0-30%; the high-calorie slurry ratio in the high-short mixed slurry is 0-30%.
Further, in the above technical scheme, in step S001, the specific preparation process of OCC waste pulp is as follows: the waste OCC raw material is conveyed to a hydropulper through a waste paper chain plate machine, the waste OCC raw material is disintegrated by the hydropulper, then the waste OCC raw material is subjected to high-concentration slag remover, metal and glass disintegrated impurities in slurry are separated by the high-concentration slag remover, then the impurities in the slurry are further removed through a coarse screen, a classifying screen, a low-concentration slag remover and a fine screen, the classifying screen classifies the slurry into long fiber slurry, medium fiber slurry and short fiber slurry according to different fiber sizes, each stage of slurry is respectively subjected to removal of partial water in the slurry through a thickener, the slurry enters a thermal dispersion device for treatment after the concentration is improved, the thermal dispersion device disperses the thermal melt in each stage of slurry into particles invisible to the naked eye through the action of high temperature and mechanical force so as to improve the appearance quality of finished paper, and each stage of slurry is pulped through disc grinding and then enters respective beating tanks.
Further, in the above technical scheme, in step S002, the specific preparation process of the unbleached wood pulp is as follows: purchasing commercial natural wood pulp finished product raw materials, delivering the commercial natural wood pulp finished product raw materials to a hydropulper through a wood pulp chain plate machine, pulping the wood pulp finished product raw materials by the hydropulper, controlling the concentration of the crushed wood pulp slurry to be about 4-5%, delivering the crushed wood pulp slurry to a wood pulp beating forehearth, beating the crushed wood pulp by a wood pulp disc mill through a pump, and delivering the crushed wood pulp disc mill into a beating posthearth after beating, wherein the wood pulp disc mill is connected in series by three disc mills, the first disc mill adopts high-strength beating, and the pulp grinding strength is 3.0-4.5J/m by using a cutting-off type grinding disc; the second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m.
In the technical scheme, the high-length mixed pulp formed by mixing the long fiber pulp with the high-clamping pulp is pulped in series by three disc mills, wherein the first disc mill adopts high-strength pulping, and a cutting-off type grinding disc is used, so that the pulping strength is 3.0-4.5J/m; the second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m; the medium fiber pulp adopts a disc mill for pulping, and adopts medium strength pulping: the grinding strength is 2.0-2.5J/m; the high-short mixed pulp formed by mixing the short fiber pulp with the high-card pulp adopts a disc mill for pulping, and adopts medium-strength pulping: the grinding strength is 2.0-2.5J/m; all of the above-mentioned disc grinders use a stainless steel ND90 disc.
Further, in the above technical scheme, in step S004, when 160-250 g of high-grade packaging paper is produced, the surface layer is quantified to be 25-35g/m2, the core layer is quantified to be 30-45g/m2, and the bottom layer is quantified to be 80-130g/m2, wherein the weight percentage of the surface layer slurry is: 20-50% of natural wood pulp and 50-80% of medium-fiber pulp; the weight percentage of the core layer slurry is as follows: 20-50% of high-length mixed pulp, 3-30% of medium-fiber pulp and 50-80% of high-length mixed pulp; the weight percentage of the bottom layer slurry is as follows: 30-70% of high-length mixed slurry and 30-60% of high-length mixed slurry.
In the above technical scheme, in step S004, when the paper web is extruded and dewatered by the pressing part, the pressing part adopts three times of pressing, wherein the pressing force of one pressing line is 700-780kn/m, the pressing force of the other pressing line is 1000-1200kn/m, and the pressing force of the other pressing line is 35-45kn/m; the paper web passes through the pressing part and then enters the front drying part for drying, the paper web passing through the front drying part is sized by a sizing machine, a layer of sizing material for improving the surface strength of finished paper is coated on the surface of the paper web, wherein the front surface of the sizing machine is sized by adopting a soaking type sizing mode, and the back surface of the sizing machine is sized by adopting a scraping rod; the paper web is sized and then enters a post-drying part for drying, and the moisture of the finished paper is controlled to be in the range of 8.0-9.0% by drying; the dried paper web enters the next section for calendering, and the paper web is pressed by a calender heating roller under a certain pressure, so that the thickness of the paper web is uniform and consistent, and the smoothness and glossiness of the paper web are improved.
In the technical scheme, the surface layer slurry, the core layer slurry and the bottom layer slurry are further added with a dry strength agent, wherein the addition amount of the dry strength agent is 10-35KG/T; the main component of the dry strength agent is polyacrylamide high molecular polymer, and hydrogen bonds are formed between the dry strength agent and fibers, so that the strength of paper is improved; the core layer slurry/bottom layer slurry and the reinforcing agent are also added, wherein the adding amount of the reinforcing agent is 0-15KG/T; the surface layer slurry and the core layer slurry are also added with starch in the slurry, wherein the addition amount of the starch in the slurry is 3-10KG/T; the starch in the pulp is prepared by steaming amphoteric starch, the main component of the amphoteric starch is prepared by modifying tapioca starch, and starch with two reactive groups of anions and cations in starch molecules is easy to adsorb amphoteric starch cationic groups because fibers are negatively charged, so that the fibers are combined together to play a role in increasing the strength of paper.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: compared with the prior art, the invention uses the high-grade pulp to replace the original imported waste pulp, reduces the natural wood pulp consumption by 15-20%, improves the national waste consumption by 10-15%, reduces the production cost of the high-grade packaging paper, and solves the problem of shortage of imported waste paper raw materials. In addition, the self-made high-grade cardboard has higher bursting strength than imported waste paper (waste paper), and higher strength than national waste paper, so that indexes such as bursting strength, folding endurance index, ring crush index and the like of the high-grade packaging paper manufactured by the invention are at higher level, the quality of finished paper is improved, and the quality requirement of customers can be met. Furthermore, the process for preparing the high-calorie pulp by self-heating is simple, scientific and reasonable. In addition, the invention improves the service life of the disc grinding sheet and the pulping effect of the fiber, and improves the service life of the sheet by about 20-30% and the pulping effect by about 15-20% by selecting the material and the tooth shape of the sheet.
The specific embodiment is as follows:
the invention will be further illustrated with reference to specific examples.
The invention relates to a method for manufacturing high-grade packaging paper by mixing and pulping high-grade pulp and waste paper, which comprises the following steps:
s001: preparation of OCC waste paper pulp: sequentially carrying out disintegration, deslagging, coarse screening and classifying screening on the national waste OCC to form long fiber pulp, medium fiber pulp and short fiber pulp, and sequentially passing the long fiber pulp obtained by the classifying screening through a slag remover, a fine screening, a multi-disc thickener, a heat dispersion, a long fiber beating front tank and a disc grinding rear tank; sequentially passing the medium fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, a heat dispersing and medium fiber beating front tank and a disc grinding rear tank; sequentially passing long fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, heat dispersion, a short fiber beating front tank and a disc grinding rear tank;
s002: preparing natural wood pulp: crushing the purchased commodity wood pulp raw material by a hydropulper, pulping by a disc mill, and then entering a post-beating pool;
s003: preparation Gao Kajiang: sequentially washing and presoaking wood chip raw materials, steaming, medium concentration grinding, screening, purifying, washing and concentrating to form high-calorie pulp, storing in a pulp tower, adding the high-calorie pulp into a long fiber beating front tank and a short fiber beating front tank in the step S001 through low concentration disc grinding for primary beating, mixing and beating the high-calorie pulp and the long fiber pulp to form high-length mixed pulp, and then entering a long fiber beating rear tank; the high-short mixed pulp formed after the high-calorie pulp and the short fiber pulp are mixed and pulped enters a short fiber beating back pool:
s004: paper machine production: putting natural wood pulp and medium fiber pulp into a surface paper machine mixed pulp pool, removing impurities, and then delivering the mixture to a surface net part through a surface layer pulp box; the high-length mixed pulp, the medium-fiber pulp and the high-short mixed pulp are put into a mixed pulp tank of a core layer paper machine, impurities are removed, and the mixed pulp is sent to a core layer net part through a core layer pulp tank; the high-length mixed pulp and the high-length mixed pulp are put into a mixed pulp tank of a bottom paper machine, impurities are removed, and the mixed pulp is sent to a bottom net part through a bottom layer pulp box; the surface layer, the core layer and the bottom layer sizing agent are dehydrated and formed by a net part to form a wet paper web, and the three layers of sizing agents are compounded together and then pass through a pressing part, pre-drying, sizing, post-drying, calendaring and coiling to prepare the high-grade packaging paper.
Compared with the prior art, the invention uses the high-grade pulp to replace the original imported waste pulp, reduces the natural wood pulp consumption by 15-20%, improves the national waste consumption by 10-15%, reduces the production cost of the high-grade packaging paper, and solves the problem of shortage of imported waste paper raw materials. In addition, the self-made high-grade cardboard has higher bursting strength than imported waste paper (waste paper), and higher strength than national waste paper, so that indexes such as bursting strength, folding endurance index, ring crush index and the like of the high-grade packaging paper manufactured by the invention are at higher level, the quality of finished paper is improved, and the quality requirement of customers can be met. Furthermore, the process for preparing the high-calorie pulp by self-heating is simple, scientific and reasonable.
In step S001, the specific preparation process of the OCC waste pulp comprises: the waste OCC raw material is conveyed to a hydropulper through a waste paper chain plate machine, the waste OCC raw material is disintegrated by the hydropulper, then the waste OCC raw material passes through a high-concentration slag separator, metal and glass disintegrated impurities in pulp are separated by the high-concentration slag separator, then the impurities in the pulp are further removed through a coarse screen, a classifying screen, a low-concentration slag separator and a fine screen, the pulp is classified into long fiber pulp, medium fiber pulp and short fiber pulp according to different fiber sizes by the classifying screen, part of water in the pulp is removed by a thickener respectively at each stage, the pulp enters a thermal dispersion device for treatment after the concentration is improved, the thermal dispersion device disperses the hot melt in each stage of pulp into particles invisible to the naked eye through the action of high temperature and mechanical force so as to improve the appearance quality of finished paper (namely high-grade packaging paper), and the pulp at each stage of pulp is pulped by disc grinding and then enters respective beating tanks.
The breaking concentration of the hydraulic pulper is 3.5-4.5%, the outlet concentration is 3.0-3.5%, and the rotor flushing water pressure is 240kPa. The pulp inlet concentration of the high-concentration slag remover is 2.5% -3.5%, the good pulp concentration is 2.5% -3.2%, the pulp inlet pressure is 250-400 kPa, and the pressure drop is 172kPa. The coarse screen adopts a two-section coarse screen, wherein the gap of the first section coarse screen is 0.6-0.8MM, the aperture of the second section coarse screen is 1.6-1.8MM, and the pulp inlet concentration is 2.0-3.0%. The pulp inlet concentration of the classifying screen is 1.5-2.2%, and the screen gap is 0.15-0.17mm. During the heat dispersion treatment, the temperature is 90-105 ℃, the back pressure is 100-160 Kpa, and the energy consumption is 35-100 kw/t.
The high-length mixed pulp formed after the long fiber pulp is mixed with the high-clamping pulp adopts three disc mills to carry out serial pulping, wherein the first disc mill adopts high-strength pulping, and a cutting-off type grinding disc is used, so that the pulp grinding strength is 3.0-4.5J/m, the cell wall of the fiber can be opened, the fiber splitting and fibrillation effects are improved, and the beating degree is effectively improved. The second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the proper middle-high pulp grinding intensity is beneficial to the proper pulp grinding effect of the pulp ground by the first disc, so that the fiber is better in external part fibrillation effect, the excessive shearing of the fiber is avoided, the tensile strength of paper is effectively improved, and the beating degree is partially improved. The third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m; the third pulp grinding intensity is relatively low and proper, and the proper pulp grinding intensity is beneficial to the softer pulp grinding effect of the shorter pulp of the two pulp grinding devices, so that the fibers obtain better inner and outer part fibrillation effect, and the cohesion and tensile strength of the paper are effectively improved.
The medium fiber pulp adopts a disc mill for pulping, and adopts medium strength pulping: the grinding strength is 2.0-2.5J/m; the high-short mixed pulp formed by mixing the short fiber pulp with the high-card pulp adopts a disc mill for pulping, and adopts medium-strength pulping: the grinding strength is 2.0-2.5J/m; because the short fiber and the medium fiber have low lengths, the grinding sheets with medium and low pulping strength are mainly adopted, and the fiber cutting is reduced by using the fiber-dividing brooming grinding sheets.
All disc grinders use a grinding disc made of stainless steel ND90, DN90 is made of stainless steel, and the disc grinders have excellent tooth breakage resistance and good wear resistance, and compared with the common stainless steel, ND90 has higher surface hardness, so that the sharpness of grinding teeth is kept during the whole service life, and the stability of the grinding quality and power especially at the later stage of the grinding disc is maintained; meanwhile, the DN90 abrasive disc can prolong the service life of the abrasive disc and meet the requirements of production quality and yield.
By using the disc grinding and pulping process, the service life of the disc grinding sheet and the pulping effect of fibers can be improved, and the service life of the sheet is improved by about 20-30% and the pulping effect is improved by about 15-20% by selecting the material and the tooth shape of the sheet.
The pulping process of each millstone is as follows: the beating concentration of the long fiber pulp is 4-6%, and the beating degree is 25-30 DEG SR; the beating concentration of the medium fiber pulp is 4-6%, and the beating degree is 30-35 DEG SR; the beating concentration of the short fiber pulp is 4-6%, and the beating degree is 35-45 DEG SR; the beating degree of the high-calorie pulp is 30-35 DEG SR; the pulping concentration of the natural wood pulp is 4-5%, and the beating degree is 30-40 DEG SR.
In step S003, the specific preparation process of the high-calorie slurry comprises: after the wood chip raw materials are presoaked by washing, the wood chip raw materials are steamed by a digester to dissolve lignin in the wood chip raw materials, fibers in the wood chip raw materials are separated into paper pulp, the paper pulp is pulped by a medium consistency mill, the wood chip fibers are fibrillated and dissociated into single fibers and fiber bundles, then the large fiber bundles, sand grains and metal particle impurities in the wood chip raw materials are removed by screening and purifying equipment, and finally the cleanliness and the concentration of the paper pulp are improved by washing and concentration, so that high-calorie pulp meeting the quality requirements is prepared and stored in a pulp tower. In the step S003, the high-calorie slurry ratio in the high-length slurry mixture is 0-30%; the high-calorie slurry ratio in the high-short mixed slurry is 0-30%. Wherein, the raw material of the wood chip adopts eucalyptus wood/acacia wood/pine. The screening and purifying equipment comprises a vacuum pulp washer and a double-roller pulp washer which are connected in sequence.
The specific preparation process requirements of the high-calorie pulp are shown in the following table.
In step S003, when the prepared high-calorie pulp, imported waste paper and national waste are beaten to the same beating degree of 30 ° SR, sheet making is performed to measure burst strength, and the conclusion is that: gao Kajiang the bursting strength is 3.84Kpa square meters per gram, the bursting strength of imported waste paper is 2.78Kpa square meters per gram, and the bursting strength of national waste paper is 1.8Kpa square meters per gram, namely Gao Kajiang the bursting strength is 38 percent higher than the bursting strength of imported waste paper and 113 percent higher than the bursting strength of national waste paper.
Experimental data for Gao Kajiang beaters alone are as follows:
the conclusion is that: when the high-calorie pulp is pulped to 40 DEG SR, the folding endurance is highest, the folding endurance is improved from 7 times to 165 times, and the folding endurance is improved by 22 times; when beating to 50 DEG SR, the fracture length, the tensile index and the bursting strength are the highest, wherein the bursting strength is improved from 2.99Kpa.
Experimental data for the mixing and beating of Gao Kajiang with long and short fiber pulps, respectively, are shown in the following table:
the conclusion is that: when the short fiber pulp and the high card pulp are mixed and pulped to 40 DEG SR, the folding endurance is highest, the folding endurance is improved from 7 times to 32 times, and the folding endurance is improved by 3.5 times; when beating to 50 DEG SR, the fracture length, the tensile index and the bursting strength are the highest, wherein the bursting strength is improved by 3.54Kpa square meter/g from 2.39Kpa square meter/g, and the improvement is 48%;
when the long fiber pulp and the high card pulp are mixed and pulped to 50 DEG SR, the fracture length, the tensile index, the bursting strength and the folding endurance are the highest, wherein the bursting strength is improved from 2.31Kpa square meter/g to 3.93Kpa square meter/g, and the improvement is 70%.
In step S002, the specific preparation process of the natural color wood pulp comprises: purchasing commercial natural wood pulp finished product raw materials, delivering the commercial natural wood pulp finished product raw materials to a hydropulper through a wood pulp chain plate machine, pulping the wood pulp finished product raw materials by the hydropulper, controlling the concentration of the crushed wood pulp slurry to be about 4-5%, delivering the crushed wood pulp slurry to a wood pulp beating forehearth, beating the crushed wood pulp by a wood pulp disc mill through a pump, and delivering the crushed wood pulp disc mill into a beating posthearth after beating, wherein the wood pulp disc mill is connected in series by three disc mills, the first disc mill adopts high-strength beating, and the pulp grinding strength is 3.0-4.5J/m by using a cutting-off type grinding disc; the second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m.
In step S004, the natural wood pulp and the medium-fiber pulp are put into a surface layer paper machine mixed pulp pool, are pumped to a flow sand remover and a pressure screen for further screening, enter a surface layer pulp box after impurities are removed, and are sent to a surface layer net part after passing through the surface layer pulp box; the high-length mixed pulp, the medium-fiber pulp and the high-length mixed pulp are put into a mixed pulp tank of a core layer paper machine, are pumped to a flow sand remover and a pressure screen for further screening, enter a core layer pulp box after impurities are removed, and are sent to a core layer net part after passing through the core layer pulp box; the high-length mixed pulp and the high-length mixed pulp are put into a mixed pulp pool of a bottom paper machine, are pumped to a flow sand remover and a pressure screen for further screening, enter a bottom layer pulp box after impurities are removed, and are sent to a bottom layer net part after passing through the bottom layer pulp box.
The formation of a wet paper web after the surface layer, the core layer and the bottom layer slurry are dehydrated and formed by a wire part means that: the net part is provided with four layers of nets, namely a surface layer net part, a core layer net part, a bottom layer net part and a dehydration net part, and the dehydration net mainly dehydrates the bottom layer slurry, so that the surface layer, the core layer and the bottom layer slurry form a wet paper web after dehydration molding through the net part.
When 160-250 g of high-grade packaging paper is produced, the surface layer is quantified to be 25-55g/m2, the core layer is quantified to be 30-65g/m2, and the bottom layer is quantified to be 80-150g/m2, wherein the weight percentage of the surface layer slurry is as follows: 20-50% of natural wood pulp and 50-80% of medium-fiber pulp; the weight percentage of the core layer slurry is as follows: 20-50% of high-length mixed pulp, 3-30% of medium-fiber pulp and 50-80% of high-length mixed pulp; the weight percentage of the bottom layer slurry is as follows: 30-70% of high-length mixed slurry and 30-60% of high-length mixed slurry.
In step S004, when the paper web is extruded and dehydrated through a pressing part, the pressing part adopts three times of line pressing, wherein the first line pressing pressure is 700-780kn/m, the second line pressing pressure is 1000-1200kn/m, and the third line pressing pressure is 35-45kn/m; the paper web passes through the pressing part and then enters the front drying part for drying, the paper web passing through the front drying part is sized by a sizing machine, a layer of sizing material for improving the surface strength of finished paper is coated on the surface of the paper web, wherein the front surface of the sizing machine is sized by adopting a soaking type sizing mode, and the back surface of the sizing machine is sized by adopting a scraping rod; the paper web is sized and then enters a post-drying part for drying, and the moisture of the finished paper is controlled to be in the range of 8.0-9.0% by drying; the dried paper web enters the next section for calendering, and the paper web is pressed by a calender heating roller under a certain pressure, so that the thickness of the paper web is uniform and consistent, and the smoothness and glossiness of the paper web are improved.
Specifically, when 160 g of high-grade packaging paper is produced, the surface layer ration is 25g/m2, the core layer ration is 34g/m2, and the bottom layer ration is 101g/m2, wherein the surface layer slurry weight percentage: 20% of natural-color wood pulp and 80% of medium-fiber pulp; the weight percentage of the core layer slurry is as follows: high-length mixed pulp 31%, medium-fiber pulp 5.6%, high-length mixed pulp 63.4%; the weight percentage of the bottom layer slurry is as follows: 45% of high-length mixed slurry and 55% of high-length mixed slurry. See in particular the following table:
the preparation and production processes of the sizing materials are shown in the following table:
the surface layer slurry, the core layer slurry and the bottom layer slurry are also added with a dry strength agent, wherein the addition amount of the dry strength agent is 10-35KG/T; the main component of the dry strength agent is polyacrylamide high molecular polymer, and hydrogen bonds are formed between the dry strength agent and fibers, so that the strength of paper is improved; the core layer slurry/bottom layer slurry and the reinforcing agent are also added, wherein the adding amount of the reinforcing agent is 0-15KG/T; the surface layer slurry and the core layer slurry are also added with starch in the slurry, wherein the addition amount of the starch in the slurry is 3-10KG/T; the starch in the pulp is prepared by steaming amphoteric starch, the main component of the amphoteric starch is prepared by modifying tapioca starch, and starch with two reactive groups of anions and cations in starch molecules is easy to adsorb amphoteric starch cationic groups because fibers are negatively charged, so that the fibers are combined together to play a role in increasing the strength of paper. The main component of the reinforcing agent is a high molecular polymer taking polyacrylamide as a main body, has relatively high charge density, moderate molecular weight and high molecular structure, can effectively promote the contact and hydroxyl combination between fibers, promote the retention and reinforcing efficiency of a dry strength agent, improve the retention of fine fibers and anionic trash, enable the fibers to form a good flocculation structure, promote the drainage of slurry at a net part, and form a relatively uniform cross-linked network through the tight combination of ionic bonds and the fibers, so that the strength and the binding force of paper are improved.
In summary, the invention uses the high-calorie pulp to replace imported waste paper pulp, and carries out mixed pulping with waste paper to form the high-grade packaging paper. In addition, the self-made high-grade cardboard has higher bursting strength than imported waste paper (waste paper), and higher strength than national waste paper, so that indexes such as bursting strength, folding endurance index, ring crush index and the like of the high-grade packaging paper manufactured by the invention are at higher level, the quality of finished paper is improved, and the quality requirement of customers can be met. Furthermore, the process for preparing the high-calorie pulp by self-heating is simple, scientific and reasonable. In addition, the invention improves the service life of the disc grinding sheet and the pulping effect of the fiber, and improves the service life of the sheet by about 20-30% and the pulping effect by about 15-20% by selecting the material and the tooth shape of the sheet.
It is understood that the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, but rather is to be accorded the full scope of all such modifications and equivalent structures, features and principles as set forth herein.
Claims (10)
1. Gao Kajiang and waste paper are mixed and beaten to make the high-grade packaging paper, which is characterized in that: the method comprises the following steps:
s001: preparation of OCC waste paper pulp: sequentially carrying out disintegration, deslagging, coarse screening and classifying screening on the national waste OCC to form long fiber pulp, medium fiber pulp and short fiber pulp, and sequentially passing the long fiber pulp obtained by the classifying screening through a slag remover, a fine screening, a multi-disc thickener, a heat dispersion, a long fiber beating front tank and a disc grinding rear tank; sequentially passing the medium fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, a heat dispersing and medium fiber beating front tank and a disc grinding rear tank; sequentially passing long fiber pulp from the classifying screen through a medium fiber slag remover, a fine screen, a multi-disc thickener, heat dispersion, a short fiber beating front tank and a disc grinding rear tank;
s002: preparing natural wood pulp: crushing the purchased commodity wood pulp raw material by a hydropulper, pulping by a disc mill, and then entering a post-beating pond to prepare natural wood pulp;
s003: preparation Gao Kajiang: sequentially washing and presoaking wood chip raw materials, steaming, medium concentration grinding, screening, purifying, washing and concentrating to form high-calorie pulp, storing in a pulp tower, adding the high-calorie pulp into a long fiber beating front tank and a short fiber beating front tank in the step S001 through low concentration disc grinding for primary beating, mixing and beating the high-calorie pulp and the long fiber pulp to form high-length mixed pulp, and then entering a long fiber beating rear tank; the high-short mixed pulp formed after the high-calorie pulp and the short fiber pulp are mixed and pulped enters a short fiber beating back pool:
s004: paper machine production: putting natural wood pulp and medium fiber pulp into a surface paper machine mixed pulp pool, removing impurities, and then delivering the mixture to a surface net part through a surface layer pulp box; the high-length mixed pulp, the medium-fiber pulp and the high-short mixed pulp are put into a mixed pulp tank of a core layer paper machine, impurities are removed, and the mixed pulp is sent to a core layer net part through a core layer pulp tank; the high-length mixed pulp and the high-length mixed pulp are put into a mixed pulp tank of a bottom paper machine, impurities are removed, and the mixed pulp is sent to a bottom net part through a bottom layer pulp box; the surface layer, the core layer and the bottom layer sizing agent are dehydrated and formed by a net part to form a wet paper web, and the three layers of sizing agents are compounded together and then pass through a pressing part, pre-drying, sizing, post-drying, calendaring and coiling to prepare the high-grade packaging paper.
2. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping according to claim 1, which is characterized in that: in step S003, the specific preparation process of the high-calorie slurry comprises: after the wood chip raw materials are presoaked by washing, the wood chip raw materials are steamed by a digester to dissolve lignin in the wood chip raw materials, fibers in the wood chip raw materials are separated into paper pulp, the paper pulp is pulped by a medium consistency mill, the wood chip fibers are fibrillated and dissociated into single fibers and fiber bundles, then the large fiber bundles, sand grains and metal particle impurities in the wood chip raw materials are removed by screening and purifying equipment, and finally the cleanliness and the concentration of the paper pulp are improved by washing and concentration, so that high-calorie pulp meeting the quality requirements is prepared and stored in a pulp tower.
3. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping according to claim 2, which is characterized in that: in the step S003, when the prepared high-calorie pulp, imported waste paper and national waste paper are beaten to the same beating degree of 30 DEG SR, sheet making is carried out to measure the burst strength, the burst strength of the high-calorie pulp is 3.84Kpa square meter per gram, the burst strength of the imported waste paper is 2.78Kpa square meter per gram, the burst strength of the national waste paper is 1.8Kpa square meter per gram, namely, the Gao Kajiang burst strength is 38% higher than the burst strength of the imported waste paper and 113% higher than the burst strength of the national waste paper.
4. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping according to claim 2, which is characterized in that: in the step S003, the high-calorie slurry ratio in the high-length slurry mixture is 0-30%; the high-calorie slurry ratio in the high-short mixed slurry is 0-30%.
5. The method for manufacturing the high-grade packaging paper by mixing and pulping Gao Kajiang and waste paper according to any one of claims 1 to 4, which is characterized in that: in step S001, the specific preparation process of the OCC waste pulp comprises: the waste OCC raw material is conveyed to a hydropulper through a waste paper chain plate machine, the waste OCC raw material is disintegrated by the hydropulper, then the waste OCC raw material is subjected to high-concentration slag remover, metal and glass disintegrated impurities in slurry are separated by the high-concentration slag remover, then the impurities in the slurry are further removed through a coarse screen, a classifying screen, a low-concentration slag remover and a fine screen, the classifying screen classifies the slurry into long fiber slurry, medium fiber slurry and short fiber slurry according to different fiber sizes, each stage of slurry is respectively subjected to removal of partial water in the slurry through a thickener, the slurry enters a thermal dispersion device for treatment after the concentration is improved, the thermal dispersion device disperses the thermal melt in each stage of slurry into particles invisible to the naked eye through the action of high temperature and mechanical force so as to improve the appearance quality of finished paper, and each stage of slurry is pulped through disc grinding and then enters respective beating tanks.
6. The method for manufacturing the high-grade packaging paper by mixing and pulping Gao Kajiang and waste paper according to any one of claims 1 to 4, which is characterized in that: in step S002, the specific preparation process of the natural color wood pulp comprises: purchasing commercial natural wood pulp finished product raw materials, delivering the commercial natural wood pulp finished product raw materials to a hydropulper through a wood pulp chain plate machine, pulping the wood pulp finished product raw materials by the hydropulper, controlling the concentration of the crushed wood pulp slurry to be about 4-5%, delivering the crushed wood pulp slurry to a wood pulp beating forehearth, beating the crushed wood pulp by a wood pulp disc mill through a pump, and delivering the crushed wood pulp disc mill into a beating posthearth after beating, wherein the wood pulp disc mill is connected in series by three disc mills, the first disc mill adopts high-strength beating, and the pulp grinding strength is 3.0-4.5J/m by using a cutting-off type grinding disc; the second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m.
7. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping according to claim 5, which is characterized in that: the high-length mixed pulp formed by mixing the long fiber pulp with the high-clamping pulp adopts three disc mills to carry out serial pulping, wherein the first disc mill adopts high-strength pulping, and adopts a cutting-off type grinding disc, and the pulping strength is 3.0-4.5J/m; the second disc mill adopts medium-high strength pulping, and the pulping strength is 2.5-3.0J/m; the third disc mill adopts medium strength beating: the grinding strength is 2.0-2.5J/m; the medium fiber pulp adopts a disc mill for pulping, and adopts medium strength pulping: the grinding strength is 2.0-2.5J/m; the high-short mixed pulp formed by mixing the short fiber pulp with the high-card pulp adopts a disc mill for pulping, and adopts medium-strength pulping: the grinding strength is 2.0-2.5J/m; all of the above-mentioned disc grinders use a stainless steel ND90 disc.
8. The method for manufacturing the high-grade packaging paper by mixing and pulping Gao Kajiang and waste paper according to any one of claims 1 to 4, which is characterized in that: in step S004, when 160-250 g of high-grade packaging paper is produced, the surface layer is quantified to be 25-55g/m2, the core layer is quantified to be 30-65g/m2, and the bottom layer is quantified to be 80-150g/m2, wherein the weight percentage of the surface layer slurry is as follows: 20-50% of natural wood pulp and 50-80% of medium-fiber pulp; the weight percentage of the core layer slurry is as follows: 20-50% of high-length mixed pulp, 3-30% of medium-fiber pulp and 50-80% of high-length mixed pulp; the weight percentage of the bottom layer slurry is as follows: 30-70% of high-length mixed slurry and 30-60% of high-length mixed slurry.
9. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper according to claim 8, which is characterized in that: in step S004, when the paper web is extruded and dehydrated through a pressing part, the pressing part adopts three times of line pressing, wherein the first line pressing pressure is 700-780kn/m, the second line pressing pressure is 1000-1200kn/m, and the third line pressing pressure is 35-45kn/m; the paper web passes through the pressing part and then enters the front drying part for drying, the paper web passing through the front drying part is sized by a sizing machine, a layer of sizing material for improving the surface strength of finished paper is coated on the surface of the paper web, wherein the front surface of the sizing machine is sized by adopting a soaking type sizing mode, and the back surface of the sizing machine is sized by adopting a scraping rod; the paper web is sized and then enters a post-drying part for drying, and the moisture of the finished paper is controlled to be in the range of 8.0-9.0% by drying; the dried paper web enters the next section for calendering, and the paper web is pressed by a calender heating roller under a certain pressure, so that the thickness of the paper web is uniform and consistent, and the smoothness and glossiness of the paper web are improved.
10. The method for manufacturing the high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping according to claim 9, which is characterized in that: the surface layer slurry, the core layer slurry and the bottom layer slurry are also added with a dry strength agent, wherein the addition amount of the dry strength agent is 10-35KG/T; the main component of the dry strength agent is polyacrylamide high molecular polymer, and hydrogen bonds are formed between the dry strength agent and fibers, so that the strength of paper is improved; the core layer slurry/bottom layer slurry and the reinforcing agent are also added, wherein the adding amount of the reinforcing agent is 0-15KG/T; the surface layer slurry and the core layer slurry are also added with starch in the slurry, wherein the addition amount of the starch in the slurry is 3-10KG/T; the starch in the pulp is prepared by steaming amphoteric starch, the main component of the amphoteric starch is prepared by modifying tapioca starch, and starch with two reactive groups of anions and cations in starch molecules is easy to adsorb amphoteric starch cationic groups because fibers are negatively charged, so that the fibers are combined together to play a role in increasing the strength of paper.
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