CN117306296A - Production method of high-proportion machine pulp refined book paper - Google Patents
Production method of high-proportion machine pulp refined book paper Download PDFInfo
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- CN117306296A CN117306296A CN202311297254.XA CN202311297254A CN117306296A CN 117306296 A CN117306296 A CN 117306296A CN 202311297254 A CN202311297254 A CN 202311297254A CN 117306296 A CN117306296 A CN 117306296A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000004513 sizing Methods 0.000 claims abstract description 85
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 62
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000004537 pulping Methods 0.000 claims abstract description 35
- 229920002678 cellulose Polymers 0.000 claims abstract description 28
- 239000001913 cellulose Substances 0.000 claims abstract description 28
- 125000002091 cationic group Chemical group 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 16
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 16
- -1 alkyl ketene dimer Chemical compound 0.000 claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000009740 moulding (composite fabrication) Methods 0.000 claims abstract description 5
- 244000166124 Eucalyptus globulus Species 0.000 claims abstract 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 28
- 229920002472 Starch Polymers 0.000 claims description 21
- 239000008107 starch Substances 0.000 claims description 21
- 235000019698 starch Nutrition 0.000 claims description 21
- 238000010009 beating Methods 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 11
- 241001397809 Hakea leucoptera Species 0.000 claims description 6
- 230000020477 pH reduction Effects 0.000 claims description 4
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 22
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000000049 pigment Substances 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 29
- 239000000047 product Substances 0.000 description 27
- 241000219927 Eucalyptus Species 0.000 description 22
- 239000010813 municipal solid waste Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 125000000129 anionic group Chemical group 0.000 description 10
- 102000004190 Enzymes Human genes 0.000 description 8
- 108090000790 Enzymes Proteins 0.000 description 8
- 238000003490 calendering Methods 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000007872 degassing Methods 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000004382 Amylase Substances 0.000 description 3
- 102000013142 Amylases Human genes 0.000 description 3
- 108010065511 Amylases Proteins 0.000 description 3
- 240000008042 Zea mays Species 0.000 description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 235000019418 amylase Nutrition 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 235000005822 corn Nutrition 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000219000 Populus Species 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 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
- 230000006978 adaptation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
- D21H11/10—Mixtures of chemical and mechanical pulp
-
- 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
- D21H21/16—Sizing or water-repelling agents
-
- 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 production method of high-proportion machine pulp refined book paper, belonging to the technical field of papermaking technology. The invention adopts 85-100% alkaline hydrogen peroxide eucalyptus mechanical pulp and 0-15% bleached sulfate needle leaf chemical pulp for mixing and pulping, the alkaline hydrogen peroxide eucalyptus mechanical pulp is pulped before pulp mixing, the pulping degree is controlled, and cationic cellulose derivative is adopted for auxiliary pulping; after the mixed sizing agent is obtained, the alkyl ketene dimer emulsified by the sulfonated polyacrylamide cationic polymer is used for carrying out internal sizing; screening, sizing, forming and dewatering on a net, squeezing, pre-drying, surface sizing and post-drying to obtain the high-proportion refined book paper. The paper product manufactured by the invention belongs to a non-pigment coated cultural paper product, has the advantages of loose paper quality, good paper strength, elegant color, fine paper surface, capability of performing high-speed rotary eight-color overprinting on paper, and good color printing effect.
Description
Technical Field
The invention belongs to the technical field of papermaking processes, and particularly relates to a production method of high-proportion machine pulp refined book paper.
Background
With implementation of sustainable development strategy in China, chemical mechanical pulp (abbreviated as chemimechanical pulp) with resource saving characteristics is increasingly favored in cultural paper production. The cultural paper mainly comprises coated paper, writing paper, double-sided offset paper, light coated paper, newsprint paper and the like; in the pulp structure of the papermaking of some culture papers, the mixing proportion of the chemi-mechanical pulp reaches even 100%, and the high-proportion chemi-mechanical pulp is matched with the papermaking culture paper to become a trend in the production of domestic culture paper.
Because the chemi-mechanical pulp fiber is stiff, when the high-proportion chemi-mechanical pulp is used for making cultural paper, the paper fiber structure is loose, the paper ink absorption is high, the absorption is uneven, and the printing is easy and impractical when the color printing is especially the large ink position printing, thereby severely limiting the high-end of the high-proportion chemi-mechanical pulp cultural paper product. Cultural paper products, especially medium and small machine products, mixed with high proportion of machine pulp in China are often unsatisfactory in color printing effect, and development and application of new technology for improving the color printing effect are urgently needed. At present, the improvement of the color printing effect of high-proportion machine pulp culture paper is a worldwide problem. In addition, the high-proportion machine pulp is adopted for production, and the strength of the paper is low due to the weak binding force of the fiber stiffness. The above problems are all problems which must be solved when the high-proportion chemi-mechanical pulp is adopted to produce cultural paper.
Disclosure of Invention
In view of the above, the present invention provides a method for producing high-ratio refined book paper by using machine pulp, and the produced paper product belongs to a non-pigment coated cultural paper product, and has the advantages of loose and thick paper, good paper strength, elegant color, fine paper surface, capability of performing high-speed rotary eight-color overprinting, and good color printing effect.
The invention provides a production method of high-proportion machine pulp refined book paper, which comprises the following steps:
mixing 85-100% of alkaline hydrogen peroxide eucalyptus mechanical pulp and 0-15% of bleached sulfate needle wood chemical pulp to prepare pulp, pulping the alkaline hydrogen peroxide eucalyptus mechanical pulp before pulp preparation, controlling the beating degree to be 55-60 DEG SR, and adopting cationic cellulose derivatives to assist beating;
after the mixed sizing agent is obtained, the alkyl ketene dimer emulsified by the sulfonated polyacrylamide cationic polymer is used for carrying out internal sizing; screening, sizing, forming and dewatering on a net, squeezing, pre-drying, surface sizing and post-drying to obtain the high-proportion refined book paper.
In an embodiment of the invention, the cationic cellulose derivative is used in an amount of 1-3kg/t pulp to assist beating.
In embodiments of the invention, the sulfonated polyacrylamide cationic polymer emulsified alkyl ketene dimer is used in an amount of 15-25kg/t paper.
In the embodiment of the invention, the alkaline hydrogen peroxide eucalyptus mechanical pulp is further subjected to acidification treatment by dilute sulfuric acid before pulping.
In the embodiment of the invention, the mass concentration of the dilute sulfuric acid is 1-2%, and the pure sulfuric acid consumption during the acidification treatment is 0.3-2.5kg/t paper.
In an embodiment of the present invention, the mass concentration of the mixed slurry is 3.0-3.5%.
In the embodiment of the invention, the surface sizing is performed by adopting enzyme conversion starch glue, wherein the mass concentration of the enzyme conversion starch glue is 12-15%, and the sizing amount is 35-42kg/t paper.
In an embodiment of the present invention, the high-proportionality machine pulp refined book has a basis weight of 62-95 g-m 2 The surface strength is more than 1.0m/s, and the bulk is more than or equal to 1.50cm 3 /g。
Compared with the prior art, the invention mainly starts from the aspects of the absorption performance of the base paper, pulping of chemical pulp, the optimization of wet end environment and the like, breaks through the traditional thinking, and develops the production technology of the high-proportion chemical pulp refined book paper. In the invention, in order to highlight the characteristic of resource saving, ensure the bulk of paper and reduce the production cost, the proportion of alkaline hydrogen peroxide bleached eucalyptus mechanical pulp in the fiber pulp structure reaches 85-100%. In order to improve the fineness and strength of paper, the invention breaks through the tradition that pulping is not performed in chemical mechanical pulp papermaking, and performs low-consistency pulping before pulp mixing. Because the chemi-mechanical pulp fiber is stiff, and is sheared by a grinding plate during pulping, the serious cutting problem is extremely easy to generate, so that the strength is not obviously increased, which is also an important reason that the traditional chemi-mechanical pulp is not pulped, and in order to solve the problem, the invention adopts the cationic cellulose derivative to assist the chemi-mechanical pulp pulping, and the cationic cellulose derivative has excellent surface activity, can be effectively adsorbed on the pulp fiber with negative charges, and promotes the swelling of the fiber; at the same time, it can improve lubricity between fibers, reduce breakage of duct cells (hardwood) and fiber cutting, and promote fine fiber formation of fibers in beating. In order to improve the fineness of paper, improve the printing effect, improve the surface strength, reduce the migration of the surface sizing composition into the paper, and ensure that the sizing composition is fixed on the surface of the paper as much as possible. The invention adopts sulfonated polyacrylamide cationic polymer emulsified Alkyl Ketene Dimer (AKD) for internal sizing. Compared with the traditional starch emulsified AKD, the AKD has quick curing after sizing, namely curing more than 70 percent before surface sizing, and the curing rate of the traditional AKD before surface sizing is below 20 percent. According to the invention, sulfonated polyacrylamide cationic polymer emulsified AKD (novel AKD) is adopted to replace the traditional AKD for internal sizing, and the field density and the surface strength of paper printing are greatly increased.
In addition, in order to improve the running efficiency of the paper machine during paper production and reduce the content of anionic trash in the system, the chemical pulp is preferably acidified by dilute sulfuric acid, and after sulfuric acid ionization, the water body has rich cations and can neutralize the anionic trash in the chemical pulp; compared with the traditional organic fixing agent or inorganic fixing agent, the invention has the advantages of low cost, good effect and convenient use.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention with reference to specific embodiments thereof is provided by way of example and explanation only, and should not be construed as limiting the scope of the present invention in any way.
The invention provides a production method of high-proportion machine pulp refined book paper, which comprises the following steps:
mixing 85-100% of alkaline hydrogen peroxide eucalyptus mechanical pulp and 0-15% of bleached sulfate needle wood chemical pulp to prepare pulp, pulping the alkaline hydrogen peroxide eucalyptus mechanical pulp before pulp preparation, controlling the beating degree to be 55-60 DEG SR, and adopting cationic cellulose derivatives to assist beating;
after the mixed sizing agent is obtained, the alkyl ketene dimer emulsified by the sulfonated polyacrylamide cationic polymer is used for carrying out internal sizing; screening, sizing, forming and dewatering on a net, squeezing, pre-drying, surface sizing and post-drying to obtain the high-proportion refined book paper.
The invention makes a non-pigment coated cultural paper product, which has the advantages of loose and thick paper, elegant color, fine paper surface, capability of performing high-speed rotary eight-color overprinting on paper, and good color printing effect. In addition, the invention can solve the problems of high content of anion garbage, easy paper breakage and low product strength in the production of high-proportion mechanical pulp.
In order to meet the requirements, the embodiment of the invention adopts the following technical scheme, wherein the scheme takes alkaline hydrogen peroxide eucalyptus mechanical pulp and bleached sulfate needle leaf wood chemical pulp as fiber raw materials for carrying out proportioning and copying, and the product is formed by thick pulp screen, seasoning, pulp flushing, sand removal and degassing, sizing, fine screening, net part dehydration molding, squeezing, pre-drying, surface sizing, post-drying, calendaring, coiling and packaging.
In order to highlight the characteristic of resource saving, ensure the bulk of paper, reduce the production cost,the alkaline hydrogen peroxide bleached eucalyptus mechanical pulp and the bleached sulfate needle chemical pulp are adopted as pulp raw materials, so that compared with the traditional poplar equalization machine pulp, the alkaline hydrogen peroxide eucalyptus mechanical pulp is wider in raw material source and higher in bulk. The length of the alkaline hydrogen peroxide eucalyptus mechanical pulp fiber is generally 1.5-1.9mm, and the bulk is 3.0-3.6cm 3 Per gram, the length of the alkaline hydrogen peroxide poplar mechanical pulp fiber is 0.6-1.0mm, and the bulk is 2.2-2.8cm 3 And/g. In terms of proportioning, the weight percentage of the alkaline hydrogen peroxide eucalyptus mechanical pulp is 85% -100%, the average length of the bleached sulfate needle wood chemical pulp fiber is 2.1-2.8mm, and the weight percentage is 0-15%. For example, some embodiments of the present invention use 100% alkaline eucalyptus peroxide mechanical pulp as the fiber raw material.
In order to improve the running efficiency of a paper machine during paper production and reduce the content of anionic trash in a system, the chemi-mechanical pulp adopts dilute sulfuric acid (with the concentration of 1-2%) for acidizing. Specifically, the amount of pure sulfuric acid may be 0.3 to 2.5kg/t of paper, preferably 0.5 to 2.2kg/t of paper; after sulfuric acid is ionized, the water body has rich cations, so that the anionic trash in the machine pulp can be neutralized, and the content of the anionic trash in the pulp can be controlled to be within 500 mu eq/L from 2000 mu eq/L, thereby greatly reducing the problem of aggregation and precipitation of the anionic trash in paper production and improving the running efficiency of the paper machine. Compared with the traditional organic fixing agent or inorganic fixing agent, the technology has low cost and good effect.
The following is that dilute sulfuric acid (concentration 1-2%) is compared with dimethyl diallyl ammonium chloride, polyaluminium chloride fixing agent to reduce the effect of anion rubbish, wherein, the acidification treatment is required to be added in the final stage of the chemical pulp production, the adding point is at the pulp feeding pump inlet (paper feeding workshop) of the pulp storage tower, thus avoiding the interference to the PH control of other working procedures of the chemical pulp, and meanwhile, the concentration of dilute sulfuric acid is 1-2%, which is too high to easily corrode equipment.
TABLE 1 comparison of the effect of dilute sulfuric acid on reduction of anionic trash with related fixing agents
In order to improve the fineness and strength of paper, the invention breaks through the tradition that pulping is not carried out in chemical mechanical pulp papermaking, and carries out low-consistency pulping before pulp mixing, and the pulping degree is controlled to be 55-60 DEG SR. Because the chemi-mechanical pulp fiber is stiff, the chemi-mechanical pulp is sheared by the grinding disc during pulping, the serious cutting problem is very easy to generate, the strength is not obviously increased, and the method is also an important reason that the traditional chemi-mechanical pulp is not pulped. To solve this problem, the embodiment of the invention adopts cationic cellulose derivative to assist pulping of machine pulp, and the dosage is preferably 1-3kg/t pulp. In particular, the viscosity of the cationic cellulose derivative is 15-45mpas (solid content 2%, room temperature, viscosity is affected by the production process of the product), the color is brownish red, and the commercial product can be adopted.
The cationic cellulose derivative is a product obtained by cationizing a cellulose derivative, the key component of the auxiliary agent is amino cellulose, the substitution degree is 0.5-0.6, and the auxiliary agent has excellent surface activity. According to the embodiment of the invention, the cationic cellulose derivative is added to assist pulping of the pulp, and the cationic characteristic of the cationic cellulose derivative is utilized to enable the pulp to be effectively adsorbed on pulp fibers with negative charges, so that swelling of the fibers is promoted; at the same time, it can improve lubricity between fibers, reduce breakage of duct cells (hardwood) and fiber cutting, and promote fine fiber formation of fibers in beating. Under the same beating degree, the average length of the fiber is longer, the stiffness is higher and the expansion ratio is smaller while the fracture length is ensured. In addition, the pulping energy consumption can be reduced, and the purpose of reducing the energy consumption is achieved. For example, when the cationic cellulose derivative of 1.5-2.5kg/t paper is added during pulping, the paper stiffness can be greatly improved, the bulk and the surface strength are obviously increased, the paper surface is finer and finer, the roughness is lower, and the pulping energy consumption is reduced by more than 20%.
The following is the relevant detection data of pulp beating degree, energy consumption and pulp strength when the cationic cellulose derivative assists the pulping machine to pulp; the pulping conditions in the experiment include: pulping with double disc mill at 30deg.C, adding cationic cellulose into the pulp of chemical machine at a ratio of 2kg/t, stirring thoroughly, mixing for 20 min, and pulping. Wherein the cationic cellulose derivative is used in an amount of 2kg/t of pulp, the beating degree is 3 DEG SR higher under the condition of 22.7% reduction of energy consumption, the average length of the pulp is 0.07mm longer, and the content of fine fibers is 6.1% less, which means that the fibers are cut less. In terms of pulp strength, the fracture length is improved by 19.0%, and the tearing index is improved by 21.2%.
Table 2 parameters and quality related to pulping of cationic cellulose derivative-assisted pulps
The following is that when the cationic cellulose derivative assists pulping machine pulp (the dosage: 2kg/t pulp), the paper quality condition is finer and finer compared with the paper without using auxiliary agent sample, the roughness is reduced by 2.9 μm, the longitudinal stiffness is improved by 12mN, the transverse stiffness is improved by 7mN, and the surface strength is improved by 0.49m/s.
Table 3 cationic cellulose derivative assisted machine pulped paper quality
The use method of the cationic cellulose derivative adopts the powdery cationic cellulose derivative, the adding point is a pulping pool, and the addition is very convenient without special dissolution equipment.
After the fiber raw materials are prepared according to the mass percentage, the mass concentration of the mixed slurry can be controlled to be 3.0-3.5%; the slurry is internally sized by Alkyl Ketene Dimer (AKD) emulsified by sulfonated polyacrylamide cationic polymer, the solid content of the product is generally 18%, the PH value is 3-4, the adding point is a paper machine pond, and the dosage can be 15-25kg/t paper.
In the present invention, in order to improve the fineness of paper, improve the printing effect and the surface strength, the migration of the sizing composition of the surface sizing composition into the paper is reduced to make the sizingThe stock components are as fixed as possible to the surface of the paper sheet, so that internal sizing is carried out with Alkyl Ketene Dimers (AKD) emulsified with a sulfonated polyacrylamide cationic polymer. Compared with the traditional starch emulsified AKD, the AKD has quick curing after sizing, namely curing more than 70 percent before surface sizing, and the curing rate of the traditional AKD before surface sizing is below 20 percent; the AKD emulsified by the sulfonated polyacrylamide cationic polymer is used for internal sizing, and the water absorption of the surface-feeding sizing paper sheet can be controlled to be 35g/m under the condition of 15-25kg/t paper 2 The following (conventional AKD sizing at 80 g/m) 2 Above), under the condition of good water resistance, the migration of the surface sizing material components to the inside of the paper sheet can be effectively reduced, and the surface sizing effect is improved. Some examples use sizing agents (e.g., AKD) to improve the water resistance of the paper by adding sizing agents to the slurry and then forming the paper by wire-bonding; starch is generally used for surface sizing, and after the paper is dried, a layer of starch is coated on the surface, and the paper is dried again to improve the surface strength and fineness of the paper.
The comparative experimental data are shown below, with a sheet basis weight of 70g/m 2 The mixture ratio is 10% of sulfate needle wood chemical pulp and 90% of eucalyptus wood mechanical pulp, calcium carbonate is adopted for filling, the filling amount is 25%, the drying temperature is 120 ℃, the paper drying time is 15 seconds and 15 minutes (complete curing) respectively, the dosage of sizing agent is changed, and the water absorption of the paper is compared.
TABLE 4 comparative degree of curing of novel AKD sizing with traditional AKD sizing
The following is comparative data, wherein the AKD usage is 22kg/t paper, and the data show that the sulfonated polyacrylamide cationic polymer emulsified AKD (novel AKD) is adopted to replace the traditional AKD for internal sizing, and the field density and the surface strength of paper printing are greatly increased.
Table 5 comparison of novel AKD to conventional AKD sized paper printing effect
Then, the embodiment of the invention is processed by a thick liquid screen, then pulp washing, sand removal and degassing, sizing, fine screening, net forming and dehydration, pressing, front drying, surface sizing, post drying, calendaring and coiling, and packaging to obtain the high-proportion refined book paper product of the machine pulp.
In the embodiments of the present invention, the processes of sizing, pressing, drying, etc. are well known to those skilled in the art. Illustratively, the consistency of the concentrated pulp screen pulp may be 3-4% and the pulp screening consistency 0.9-1.1%; the line pressure of the pressing part is 700-900N/cm, and the temperature of the front drying cylinder is 70-110 ℃. The surface sizing is preferably carried out by adopting enzyme conversion starch glue, corn raw starch is adopted, and the process conditions specifically comprise: the mass concentration of the enzyme-converted starch glue can be 12-15%, the amylase dosage is 90-120 g/ton of absolute dry starch, and the paper sizing amount is preferably 35-42kg/t of paper. The temperature of the after-drying dryer is 70-110 ℃, two soft calendars are adopted for calendaring, the pressure of a calendar line is 80-140N/cm, and the temperature of a hot roller is 100-140 ℃.
The ration of the high-proportion refined machine pulp book paper product obtained by the embodiment of the invention is 62-95g/m 2 The surface strength is more than 1.0m/s, and the bulk is more than or equal to 1.50cm 3 /g; further, the longitudinal fracture length is more than or equal to 4200m, the smoothness is 35-41 s, the whiteness is 76-77% ISO, and the paper color is white; the high-speed rotary eight-color overprinting has good printing effect. The technology has great significance for improving the competitiveness of products, expanding sales channels, improving the vitality of small and medium machines, improving the profit level, promoting the high-end of the products, promoting the sustainable development, and even making up the international and domestic blank.
The product of the embodiment of the invention is mainly used for printing medium-high end books, and the bulk of the product is 1.5cm 3 Above/g, the product has good paper fineness and printing effect, good reading experience, low smoothness requirement of common sketch paper and other products, and much higher bulk than the product of the embodiment of the invention, and much lower smoothness than the product (the common bulk is 1.8 cm) 3 Above/g, smoothness within 10 s) for pencil sketchIs generally not used for printing, and basically has no requirement on color printing effect.
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention. In the following examples, mass ratios are given unless otherwise specified; the raw materials are all commercially available and conventional equipment is adopted.
The length of the alkaline hydrogen peroxide eucalyptus mechanical pulp fiber is 1.5-1.9mm, and the bulk is 3.0-3.6cm 3 The average length of the bleached sulfate needle wood chemical pulp fiber is 2.1-2.8mm; the sulfonated polyacrylamide cationic polymer emulsified alkyl ketene dimer, cationic cellulose derivative viscosity 15-45mpas (solid content 2%) and brown red color.
Example 1
The alkaline hydrogen peroxide eucalyptus mechanical pulp is prepared by adopting 100% alkaline hydrogen peroxide eucalyptus mechanical pulp, dilute sulfuric acid is adopted to reduce anionic trash before pulping, the dosage is 0.8kg/t paper (100% concentration meter), and cationic cellulose derivative is adopted to assist pulping, the dosage is 1.5kg/t paper, and the beating degree is 56 DEG SR. The mixed sizing agent is prepared into Alkyl Ketene Dimer (AKD) emulsified by sulfonated polyacrylamide cationic polymer with the concentration of 3.5%, sizing is carried out in the sizing agent, the dosage is 20kg/t paper, the adding point is a paper machine pool, and the sizing agent is processed by a thick sizing screen, then pulp washing, sand removal and degassing, sizing, fine screening, net forming and dehydration, squeezing, pre-drying, surface sizing, post-drying, calendaring, reeling and packaging to obtain the high-proportion machine sizing refined book paper.
Wherein, the concentration of the pulp of the thick pulp screen is 3.5%, the concentration of the pulp on the net is 0.95%, the line pressure of the pressing part is 700-900N/cm, and the temperature of the pre-drying cylinder is 70-110 ℃. The surface sizing process comprises the following steps: the surface sizing is carried out by adopting enzyme converted starch glue, corn raw starch is adopted, and the process conditions specifically comprise: the mass concentration of the enzyme converted starch glue is 15%, the amylase dosage is 105 g/ton of absolute dry starch, and the paper sizing amount is 40kg/t of paper. The temperature of the after-drying dryer is 70-110 ℃, two soft calendars are adopted for calendaring, the pressure of a calendar line is 100N/cm and 120N/cm respectively, and the temperature of a hot roller is 120 ℃.
The product ration was measured to be 70g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Surface strength 1.1m/s; smoothness 35s; pine nutThe thickness is more than or equal to 1.50cm 3 /g; the paper color is white, the whiteness is 76% ISO; the longitudinal fracture length is more than or equal to 4200m; paper gloss 5%, print land density (black) 1.26, print land density (yellow) 0.88, print land density (blue) 0.96.
The longitudinal fracture length of the common high-proportion slurry product is generally 3500-4000m, the printing field density (black) is less than 1, the printing field density (yellow) is less than 0.7, the printing field density (blue) is less than 0.8, and the printing effect is relatively worse than the application.
Example 2
88% of alkaline hydrogen peroxide eucalyptus mechanical pulp and 12% of bleached sulfate needle leaf chemical pulp are adopted, the alkaline hydrogen peroxide eucalyptus mechanical pulp adopts dilute sulfuric acid to reduce anionic trash before pulping, the dosage is 1.5kg/t paper (100% concentration meter), and cationic cellulose derivative is adopted to assist pulping, the dosage is 1.2kg/t paper, and the beating degree is 58 DEG SR. The sizing agent is prepared into 3.3% concentration, alkyl Ketene Dimer (AKD) emulsified by sulfonated polyacrylamide cationic polymer is adopted in the sizing agent for sizing, the dosage is 17kg/t paper, the adding point is a paper machine pool, and the sizing agent is subjected to thick sizing, sand removal and degassing, sizing, fine screening, net forming and dehydration, squeezing, pre-drying, surface sizing, post-drying, calendaring, coiling and packaging to form the high-proportion machine sizing refined book paper.
The surface sizing process comprises the following steps: the concentration of the enzyme converted starch glue is 13%, and the sizing amount is 36 kg/ton of paper; the other processes were the same as in example 1.
Measured, the product ration is 62g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Surface strength 1.25m/s; smoothness 41s; the bulk is more than or equal to 1.50cm 3 /g; the paper color is white, and the whiteness is 76.5% ISO; the longitudinal fracture length is more than or equal to 4200m; the paper had a printed land density (black) of 1.19, a printed land density (yellow) of 0.83 and a printed land density (blue) of 0.98.
Example 3
The alkaline hydrogen peroxide eucalyptus mechanical pulp is prepared by 95% of bleached sulfate needle leaf chemical pulp, dilute sulfuric acid is adopted to reduce anionic trash before pulping, the dosage of the alkaline hydrogen peroxide eucalyptus mechanical pulp is 2.2kg/t paper (100% concentration meter), cationic cellulose derivative is adopted to assist pulping, the dosage of the alkaline hydrogen peroxide eucalyptus mechanical pulp is 2.0kg/t paper, and the beating degree of the alkaline hydrogen peroxide eucalyptus mechanical pulp is 59 DEG SR. The sizing agent is prepared into 3.2% concentration, alkyl Ketene Dimer (AKD) emulsified by sulfonated polyacrylamide cationic polymer is adopted in the sizing agent for sizing, the dosage is 23kg/t paper, the adding point is a paper machine pool, and the sizing agent is subjected to thick sizing, sand removal and degassing, sizing, fine screening, net forming and dehydration, squeezing, pre-drying, surface sizing, post-drying, calendaring, reeling and packaging to form the high-proportion machine sizing refined book paper.
Wherein, the concentration of the pulp of the thick pulp screen is 3.3 percent, the concentration of the pulp on the net is 0.99 percent, the line pressure of the pressing part is 700-900N/cm, and the temperature of the pre-drying cylinder is 70-110 ℃. The surface sizing process comprises the following steps: the surface sizing is carried out by adopting enzyme converted starch glue, corn raw starch is adopted, and the process conditions specifically comprise: the mass concentration of the enzyme converted starch glue is 14%, the amylase dosage is 110 g/ton of absolute dry starch, and the paper sizing amount is 41kg/t of paper. The temperature of the after-drying dryer is 70-110 ℃, two soft calendars are adopted for calendaring, the pressure of a calendar line is 95N/cm and 130N/cm respectively, and the temperature of a hot roller is 110 ℃.
The product ration is 95g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Surface strength 1.31m/s; smoothness 35s; the bulk is more than or equal to 1.50cm 3 /g; the paper color is white, and the whiteness is 76.3 percent ISO; the longitudinal fracture length is more than or equal to 4200m; the paper printing field density (black) is 1.21, the printing field density (yellow) is 0.84, the printing field density (blue) is 0.93, and the longitudinal fracture length, the printing effect and the like are obviously better than those of the common high-proportion sizing agent product.
According to the embodiment, the process method reduces cost and energy consumption, and the manufactured paper product has the advantages of loose paper quality, good paper strength, elegant color, fine paper surface, capability of performing high-speed rotary eight-color overprinting, and good color printing effect.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this invention, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the invention, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.
Claims (8)
1. The production method of the high-proportion machine pulp refined book paper is characterized by comprising the following steps of:
mixing 85-100% of alkaline hydrogen peroxide eucalyptus mechanical pulp and 0-15% of bleached sulfate needle wood chemical pulp to prepare pulp, pulping the alkaline hydrogen peroxide eucalyptus mechanical pulp before pulp preparation, controlling the beating degree to be 55-60 DEG SR, and adopting cationic cellulose derivatives to assist beating;
after the mixed sizing agent is obtained, the alkyl ketene dimer emulsified by the sulfonated polyacrylamide cationic polymer is used for carrying out internal sizing; screening, sizing, forming and dewatering on a net, squeezing, pre-drying, surface sizing and post-drying to obtain the high-proportion refined book paper.
2. The method of claim 1, wherein the cationic cellulose derivative is used in an amount of 1-3kg/t pulp to assist beating.
3. The method of claim 1, wherein the sulfonated polyacrylamide cationic polymer is emulsified alkyl ketene dimer in an amount of 15-25kg/t paper.
4. A method according to any one of claims 1-3, characterized in that the alkaline hydrogen peroxide eucalyptus mechanical pulp is further acidified with dilute sulfuric acid before pulping.
5. The method according to claim 4, wherein the mass concentration of the dilute sulfuric acid is 1-2%, and the amount of pure sulfuric acid used in the acidification treatment is 0.3-2.5kg/t paper.
6. The production method according to claim 5, wherein the mass concentration of the mixed slurry is 3.0 to 3.5%.
7. The method according to claim 6, wherein the surface sizing is performed by using an enzyme-converted starch glue, the mass concentration of the enzyme-converted starch glue is 12-15%, and the sizing amount is 35-42kg/t paper.
8. The method according to claim 7, wherein the high-ratio machine pulp refined book paper has a basis weight of 62-95g/m 2 The surface strength is more than 1.0m/s, and the bulk is more than or equal to 1.50cm 3 /g。
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