CN114481659B - High-strength craft paper and production process thereof - Google Patents
High-strength craft paper and production process thereof Download PDFInfo
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- CN114481659B CN114481659B CN202210008510.8A CN202210008510A CN114481659B CN 114481659 B CN114481659 B CN 114481659B CN 202210008510 A CN202210008510 A CN 202210008510A CN 114481659 B CN114481659 B CN 114481659B
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- 238000004513 sizing Methods 0.000 claims abstract description 56
- 239000010791 domestic waste Substances 0.000 claims abstract description 39
- 239000002699 waste material Substances 0.000 claims abstract description 38
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 238000004537 pulping Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims abstract description 23
- 239000002655 kraft paper Substances 0.000 claims abstract description 21
- 239000012792 core layer Substances 0.000 claims abstract description 17
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 125000002091 cationic group Chemical group 0.000 claims description 75
- 229920002401 polyacrylamide Polymers 0.000 claims description 59
- 229920001131 Pulp (paper) Polymers 0.000 claims description 54
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- 125000000129 anionic group Chemical group 0.000 claims description 23
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- 230000009172 bursting Effects 0.000 description 4
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- 239000012790 adhesive layer Substances 0.000 description 3
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The invention discloses a high-strength craft paper, which comprises a surface layer, a core layer and a bottom layer; the high-strength kraft liner is prepared by pulping, pulp-mixing and flow-flowing and papermaking processes. The high-strength kraft liner board comprises raw materials for preparing pulp and papermaking chemical additives, wherein the pulp comprises softwood pulp, domestic waste pulp and imported American waste pulp; the chemical additives include one or more of reinforcing agents, retention aids, sizing agents, dyes. The burst index of the high-strength craft paper prepared by the invention reaches 4.0-5.6 KPa.m 2 And/g, the folding endurance is greater than 150 times. Meanwhile, the high-strength craft paper prepared by the method has good moisture resistance, is suitable for freezing and long-distance sea transportation, and cannot collapse due to moisture absorption.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a high-strength kraft liner board and a preparation method thereof.
Background
The craft paper is a kind of packaging paper, mainly made into corrugated paper box after being adhered with corrugated paper core, used for packaging household appliances, daily goods, knitted cotton fabrics, cultural goods, external packages of Chinese and western patent medicines, etc., and has close relation with the daily life of people and the development of national economy. The Gao Jiangniu paperboard is tougher and firmer than the general case paperboard, has the characteristics of higher burst strength, puncture strength and folding endurance, good moisture resistance, good appearance quality and the like, and has stronger competitive advantage in the manufacturing field of foreign trade packaging cartons and domestic high-grade commodity packaging cartons.
Most of the craft paper produced in China has higher waste paper content and lower wood pulp content, and cannot reach higher strength and higher moisture resistance due to the reasons of raw materials and technology. The product strength is low, and the domestic product burst index can reach 3.8 KPa.m at maximum 2 And/g, the paper for the packaging box with high strength cannot be achieved, and the moisture absorption resistance is poor.
In the prior art, the technical proposal of adopting secondary fiber, adding specific reinforcing agent and the like for improving the strength is adopted, but the burst index of the obtained craft paper is still lower than 4.0 KPa.m 2 And/g, is not suitable for being used as high-grade packaging boxes such as large-scale bearing boxes; the moistureproof effect is limited, and especially the problem that the collapse is easily caused by moisture absorption in the sea transportation and freezing packaging process cannot be solved; meanwhile, the kraft liner board has the problems of poor appearance, no wood pulp texture on the surface and the like. Therefore, the development of the craft paper product with high strength and moisture resistance has great significance.
Disclosure of Invention
Adopting proper fiber and chemical raw material collocation and proper production process to produce high-strength boxboard paper product; by adjusting pulping and papermaking forming processes, the front surface of the product has special wood textures, and the appearance is attractive and elegant. Meanwhile, the sizing process is adjusted, so that the product has good moisture absorption resistance and is suitable for freezing and long-distance sea transportation.
The high-strength craft paper comprises a surface layer, a core layer and a bottom layer. The high-strength kraft liner is prepared by pulping, pulp-mixing and flow-flowing and papermaking processes.
The high-strength kraft liner board comprises raw materials for preparing pulp and papermaking chemical additives, wherein the pulp comprises softwood pulp, domestic waste pulp and imported American waste pulp; the chemical additives include one or more of reinforcing agents, retention aids, sizing agents, dyes.
The surface layer adopts softwood pulp to add an enhancer, a retention aid, a sizing agent and a dye to obtain surface layer pulp;
the core layer is prepared by mixing softwood pulp, domestic waste paper pulp and/or imported waste pulp according to a certain proportion, and adding an enhancer, a retention aid, a sizing agent and dye to obtain core layer pulp;
in the core layer mixed raw material (the raw material is 100 percent basis), the softwood pulp accounts for 30-100wt%, the domestic waste paper pulp accounts for 0-70%, and the imported waste pulp accounts for 0-80%.
Preferably, the softwood pulp accounts for 50-70wt% and the other raw materials are domestic waste pulp and/or imported waste pulp.
In the core layer mixed slurry, the softwood pulp, domestic waste paper pulp and imported American waste paper pulp form a composite system, and the softwood pulp is taken as a main component, and if the proportion is too low, the adverse effect that the bursting strength is low and the standard is not reached is caused. In addition to softwood pulp, one or both of domestic waste pulp and imported American waste pulp can be used to form a system with softwood pulp. Therefore, the core material of the present invention needs to be controlled within a proper range and ratio.
The reinforcing agent is polyacrylamide; the sizing agent is selected from alkyl ketene dimer, cationic rosin size or/and Alkenyl Succinic Anhydride (ASA); the retention aid comprises cationic polyacrylamide and/or anionic polyacrylamide; the dyes include liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC, and black dye brilliant-xiu GN.
Optionally, 0-0.2% of other auxiliary agents such as polyaluminum chloride or polyaluminum sulfate can be added into the core layer mixed slurry, so that anions of the system can be neutralized; or cationic starch, has reinforcing and retention promoting effects.
The bottom layer is prepared by mixing softwood pulp, domestic waste paper pulp and/or imported waste pulp according to a certain proportion, and adding an enhancer, a retention aid, a sizing agent and dye.
In the bottom layer mixed raw material (the raw material is 100 percent basis), the softwood pulp accounts for 30-100wt%, the domestic waste paper pulp accounts for 0-70%, and the imported waste American pulp accounts for 0-80%.
The core layer raw material and the bottom layer raw material can be the same or different.
Preferably, the softwood pulp accounts for 50-70wt% and the other raw materials are domestic waste pulp and/or imported waste pulp.
In the bottom mixed slurry, the softwood pulp, the domestic waste paper pulp and the imported American waste paper pulp form a composite system, the softwood pulp is taken as a main component, and if the proportion is too low, the adverse effect that the bursting strength is low and the bursting strength does not reach the standard is caused. In addition to softwood pulp, one or both of domestic waste pulp and imported American waste pulp can be used to form a system with softwood pulp. Therefore, the underlying material of the present invention needs to be controlled within a suitable range and ratio.
The reinforcing agent is polyacrylamide; the sizing agent is selected from alkyl ketene dimer, cationic rosin size or/and Alkenyl Succinic Anhydride (ASA); the retention aid comprises cationic polyacrylamide and/or anionic polyacrylamide; the dyes include liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC, and black dye brilliant-xiu GN.
Optionally, 0-0.2% of other auxiliary agents such as polyaluminum chloride or polyaluminum sulfate can be added into the bottom mixed slurry, so that anions of the system can be neutralized; or cationic starch, has reinforcing and retention promoting effects.
The pulping, pulp-mixing and flow-flowing and papermaking process of the invention is to prepare and distribute surface layer pulp, core layer pulp and bottom layer pulp respectively, and make three layers of pulp respectively.
Specifically, the pulping comprises the steps of:
s101, pretreatment of softwood pulp:
the raw materials are crushed, deslagged and ground to obtain the pretreated conifer chemical pulp.
The raw materials comprise homemade or commercial natural-color needle wood chemical pulp.
The chemical pulp breaking concentration of the needle wood is 3.8-5.2%, and the beating degree after grinding is 15-28 DEG SR.
S102, preparing domestic waste paper pulp:
domestic waste paper is crushed, deslagged, classified and screened, purified, concentrated, thermally dispersed and ground to obtain domestic waste paper pulp.
The domestic waste paper pulp disintegrating concentration is 8.0%, and the beating degree after grinding is 25-45 DEG SR.
S103, preparing domestic waste paper pulp:
and (3) crushing, deslagging and pulping the imported waste pulp board to obtain imported waste pulp.
The breaking concentration of the waste pulp board is 3.2-5.5%, and the beating degree after grinding is 18-35 DEG SR.
S104, utilizing damaged paper pulp: the broken paper produced in the process is crushed and concentrated to obtain broken paper pulp, and the broken paper pulp can be recycled and reused and can be mixed with waste pulp or treated independently.
The slurry preparation comprises the following steps:
s201, pumping the softwood pulp prepared in the step S101 into a pre-papermaking pond, adding an enhancer, a sizing agent, a retention aid and a proper amount of dye, and entering a streaming system to obtain surface pulp.
The addition amount of the reinforcing agent is 0-6wt% of the softwood pulp; the addition amount of the sizing agent is 0-1.5wt% of the softwood pulp; the addition amount of the retention aid is 0-1.1wt% of the softwood pulp; the dye is added in an amount of 0.01-0.2wt% of the softwood pulp.
S202, mixing the softwood pulp processed in the step S101, the domestic waste pulp obtained in the step S102 and/or the imported waste pulp obtained in the step S103 to obtain mixed pulp, adding an enhancer, a sizing agent, a retention aid and a proper amount of dye, and entering a streaming system to obtain core pulp.
The addition amount of the reinforcing agent is 0-6wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1wt% of the mixed slurry; the dye is added in an amount of 0.01-0.2wt% of the mixed slurry.
S203, adding reinforcing agent, sizing agent, retention aid and proper amount of dye into the natural-color softwood pulp processed in the step S101, the domestic waste pulp obtained in the step S102 and/or the imported waste pulp mixed pulp obtained in the step S103, and entering a streaming system to obtain bottom pulp.
The addition amount of the reinforcing agent is 0-6wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1wt% of the mixed slurry; the dye is added in an amount of 0.01-0.2wt% of the mixed slurry.
The making comprises the following steps:
s301, respectively dehydrating and forming the three layers of slurry to obtain a wet paper sheet;
respectively feeding the three layers of slurry passing through the flow system into a surface layer, a core layer and a bottom layer slurry box, then carrying out net surfing and dehydration, wherein the concentration of the net surfing slurry is 0.3-1.5%, the speed difference of a slurry net is-30-30 m/min, and the proportion of dilution water is 10-20%;
s302, squeezing and dehydrating the dehydrated wet paper sheet:
conveying the wet paper sheet dehydrated and formed by the wire part to a press part for press dehydration, wherein the pressing line pressure of a first press shoe is 800-1050kN/m, the pressing line pressure of a second press shoe is 800-1050kN/m, and the dryness of the paper sheet discharged from the press part is 48-52%;
s303, pre-drying the pressed wet paper sheet, after drying, sizing by a sizing machine, and then drying after sizing.
The adhesive layer is a mixture solution of modified starch and surface sizing agent, the modified starch accounts for 80-90 parts by weight based on 100 parts by weight of the sum of the modified starch and the surface sizing agent, the balance is the surface sizing agent, and the total weight percentage concentration of the modified starch and the surface sizing agent in the adhesive layer used for the front surface adhesive layer is 6-11%.
And S304, calendaring the paper after the post-drying, wherein the surface temperature of the hard calendaring hot roller is 80-170 ℃, the line pressure of a press area is 20-130kN/m, and then coiling the paper to obtain the high-strength kraft paper.
S305, collecting and recycling fibers generated in the papermaking process, and beating the fibers into the step S103 for use together with domestic waste paper pulp to form recycling.
The ration of the prepared high-strength craft paper is 110-330g/m 2 The burst index reaches 4.0-5.6 KPa.m 2 /g。
Meanwhile, the high-strength craft paper prepared by the method has good moisture resistance, and the water absorption value of the Cobb method for 30 minutes is less than or equal to 150g/m 2 。
Further, the prepared high-strength craft paper has beautiful cloud-like wood grain appearance.
The invention has the beneficial effects that:
1. the invention strictly controls the composition and proportion of the surface layer, the core layer and the bottom layer raw materials, combines the usage of the softwood pulp, the national waste and the American waste and the collocation of chemical auxiliary agents (reinforcing agents, sizing agents and the like) and adopts a proper production process to produce a high-strength boxboard paper product with high strength and burst index reaching 4.0-5.6 KPa.m 2 The folding strength of the product is generally more than 150 times per gram, which is far higher than the bursting strength index (3.8 KPa.m) 2 Normal level of folding endurance (80 times).
2. The invention adopts the raw materials to prepare the proper sizing agent and matches the sizing process in the papermaking process, so that the product has good moisture absorption resistance, the water absorption value of the Cobb method for 30 minutes is less than or equal to 150g/m < 2 >, and the invention is suitable for freezing and long-distance sea transportation, can be completely suitable for high-grade packaging applications such as freezing packaging, sea transportation packaging and the like, and cannot collapse due to moisture absorption.
3. The invention fully utilizes the raw materials, utilizes the waste paper pulp and fiber and damaged pulp produced in the preparation process of the waste paper pulp and the waste paper pulp for secondary use, and prepares the strength with more excellent performance, thereby not only improving the utilization rate of the raw materials, but also recycling the pulp in the production process, reducing the processes of discharge post-treatment and the like, and greatly reducing the production cost.
4. The high-strength kraft paper prepared by the invention has beautiful appearance and special cloud-like wood grains on the surface.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a flow chart of the paper machine of the present invention.
FIG. 2 is a flow chart of the wastepaper pulping process of the present invention.
FIG. 3 is a graph showing the comparison of the present invention of comparative example 1 (above) with the craft paper prepared in example 1 (below).
FIG. 4 shows a high strength kraft liner of the invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The high-strength kraft liner board of the embodiment comprises a surface layer, a core layer and a bottom layer, and the preparation raw materials comprise pulp and papermaking chemicals and comprise the following steps:
s1, pulping, which comprises the following steps:
s101, crushing natural-color softwood pulp by a pulper, removing slag by a high-concentration sand remover, and pulping by a large-taper refiner to obtain softwood pulp, wherein the crushing concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 19 DEG SR;
s102, crushing domestic waste paper by a pulper, removing slag by a high-concentration sand remover, screening by a grading sieve, purifying, concentrating, thermally dispersing, pulping to obtain waste paper pulp, wherein the crushing concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, crushing the imported waste pulp board by a pulper, removing slag by a high-concentration sand remover, and pulping by a double-disc pulping machine to obtain imported waste pulp, wherein the crushing concentration of the waste pulp board is 6.0%, and the beating degree after grinding is 25 DEG SR;
s104, crushing the damaged paper produced in the processes of the wire section, the press section, the front drying section, the rear drying section and the coiling, and concentrating to obtain damaged paper pulp;
s2, slurry mixing and flowing, which comprises the following steps:
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pond, simultaneously adding a polyacrylamide reinforcing agent accounting for 1% of the mass of the pulp, an alkyl ketene dimer accounting for 0.5%, cationic polyacrylamide accounting for 0.05% and anionic polyacrylamide accounting for 0.6%, adding 0.1% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-show GN, and then entering a streaming system through a pressure screen to serve as surface pulp;
s202, mixing natural-color softwood pulp (50 wt%) treated in the step S101, domestic waste pulp (30 wt%) obtained in the step S102 and imported American waste pulp (20 wt%) obtained in the step S103 in a pulp tank of a paper machine, simultaneously adding 0.5% of polyacrylamide reinforcing agent, 0.5% of cationic starch, 0.9% of alkyl ketene dimer, 0.4% of cationic polyacrylamide, 0.2% of anionic polyacrylamide and 0.1% of polyaluminum chloride, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-show GN relative to the mass of the mixed pulp, and then entering a streaming system through a pressure screen as core pulp;
s203, mixing natural-color softwood pulp (50 wt%) treated in the step S101, domestic waste pulp (20 wt%) obtained in the step S102 and imported American waste pulp (30 wt%) obtained in the step S103 in a pulp tank of a paper machine, simultaneously adding 0.5% of polyacrylamide reinforcing agent, 0.5% of cationic starch, 0.9% of alkyl ketene dimer, 0.4% of anionic polyacrylamide, 0.1% of polyaluminium chloride and 0.2% of cationic polyacrylamide, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Brilliant Xiugn relative to the mass of the mixed pulp, and then entering a streaming system through a pressure screen as bottom pulp;
s3, making paper, comprising the following steps of:
s301, respectively feeding the three layers of slurry passing through the flow system into a surface layer, a core layer and a bottom layer slurry box, then carrying out net surfing and dehydration, wherein the concentration of the net surfing slurry is 0.5%, the speed difference of the slurry net is 30m/min, the proportion of dilution water is 10%, the vacuum degree of a net part forming roller is 10kPa, the vacuum degree of a wet forming box is 10kPa, the vacuum degree of a wet suction box is 20kPa, the vacuum degree of a vacuum couch roller is 50kPa, and the vacuum degree of a high vacuum water absorption box is 50kPa;
s302, conveying the wet paper sheet dehydrated and formed by the wire part to a press part for press dehydration, wherein the pressing line pressure of a first press shoe is 930kN/m, the pressing line pressure of a second press shoe is 980kN/m, and the dryness of the paper sheet discharged from the press part is 50%;
s303, conveying the pressed wet paper sheet to a front drying part for front drying, conveying the wet paper sheet to a sizing machine for sizing after the drying is finished, and conveying the wet paper sheet to a rear drying part for sizing and drying, wherein the pressure of a roller-to-roller nip of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150kPa;
s304, delivering the paper dried by the post-drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calender hot roller is 130 ℃, the line pressure of a nip is 50kN/m, and then coiling the paper to obtain the high-strength kraft paper;
s305, filtering white water generated by a net part and a press part in the papermaking process through a multi-disc filter, and collecting recovered fibers by a fiber recovery tank to obtain the recovered fibers, and pumping the recovered fiber pulp into the step S103 by a pump for use together with domestic waste paper pulp.
Example 2
The preparation method of the high-strength craft paper comprises the following steps:
s1, pulping, which comprises the following steps:
s101, crushing natural-color softwood pulp by a pulper, removing slag by a high-concentration sand remover, and pulping by a large-taper refiner to obtain softwood pulp, wherein the crushing concentration of the softwood pulp is 6.0%, and the beating degree after grinding is 15 DEG SR;
s102, crushing domestic waste paper by a pulper, removing slag by a high-concentration sand remover, screening by a grading sieve, purifying, concentrating, thermally dispersing, and pulping to obtain waste paper pulp, wherein the crushing concentration of the waste paper pulp is 7.0%, and the beating degree after grinding is 33 DEG SR;
s103, crushing the imported waste pulp board by a pulper, removing slag by a high-concentration sand remover, and pulping by a double-disc pulping machine to obtain imported waste pulp, wherein the crushing concentration of the waste pulp board is 6.0%, and the beating degree after grinding is 26 DEG SR;
s104, crushing the damaged paper produced in the processes of the wire section, the press section, the front drying section, the rear drying section and the coiling, and concentrating to obtain damaged paper pulp.
S2, slurry mixing and flowing, which comprises the following steps:
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a papermaking front tank, simultaneously adding 1.1% of alkyl ketene dimer sizing agent, 0.5% of cationic polyacrylamide and 0.3% of anionic polyacrylamide, adding 0.15% of proper amounts of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-front GN into the slurry to serve as surface layer slurry through a pressure screen;
s202, mixing natural-color softwood pulp (70%) treated in the step S101 and domestic waste paper pulp (30%) obtained in the step S102 in a paper machine pulp tank, adding 5.1% of reinforcing agent polyacrylamide, 0.8% of alkyl ketene dimer, 0.3% of cationic polyacrylamide and 0.6% of anionic polyacrylamide relative to the mass of the mixed pulp, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Brilliant Xiugn together, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, mixing natural-color softwood pulp (60%) treated in the step S101 and domestic waste paper pulp (40%) obtained in the step S102 in a paper machine pulp tank, adding 5.3% of reinforcing agent polyacrylamide, 0.8% of alkyl ketene dimer, 0.4% of cationic polyacrylamide and 0.6% of anionic polyacrylamide relative to the mass of the mixed pulp, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Brilliant Xiugn together, and then entering a streaming system through a pressure screen to serve as bottom pulp;
s3, the papermaking step is the same as in example 1.
Example 3
Steps S1 and S3 are the same as in example 1.
S2, slurry mixing and flowing, which comprises the following steps:
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a papermaking front tank, simultaneously adding 0.1% of polyacrylamide reinforcing agent, 0.08% of Alkenyl Succinic Anhydride (ASA) sizing agent, 0.05% of cationic polyacrylamide and 0.5% of anionic polyacrylamide, wherein the total content of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-show GN is 0.15%, and then entering a streaming system through a pressure screen to serve as surface layer pulp;
s202, mixing natural-color softwood pulp (50%) treated in the step S101 and imported Mei waste pulp (50%) obtained in the step S103 in a pulp tank of a paper machine, adding 5% of a reinforcing agent, 0.08% of Alkenyl Succinic Anhydride (ASA) sizing agent, 0.4% of cationic polyacrylamide and 0.5% of anionic polyacrylamide according to the mass of the pulp, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Yante Xiugn together, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, mixing the natural-color softwood pulp (60%) treated in the step S101 and the imported Mei waste pulp (40%) obtained in the step S103 in a pulp tank of a paper machine, adding 5.5% of a reinforcing agent, 0.1% of Alkenyl Succinic Anhydride (ASA) sizing agent, 0.45% of cationic polyacrylamide and 0.6% of anionic polyacrylamide according to the mass of the pulp, adding 0.15% of a liquid red dye (cationic red K28) BMC, a yellow dye (cationic yellow DGL) BMC and a black dye Brilliant GN in total, and then entering a streaming system through a pressure screen to serve as bottom pulp.
Example 4
Other steps are the same as in example 1, except that:
s202, mixing natural-color softwood pulp (50 wt%) treated in the step S101, domestic waste pulp (40 wt%) obtained in the step S102 and imported American waste pulp (10 wt%) obtained in the step S103 in a paper machine pulp tank, mixing in the paper machine pulp tank, adding 0.35% of cationic polyacrylamide, 0.5% of cationic starch, 1.2% of cationic rosin gum, 0.5% of polyaluminium chloride and 0.2% of anionic polyacrylamide, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-xiu GN together, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, mixing natural-color softwood pulp (40 wt%) treated in the step S101, domestic waste pulp (20 wt%) obtained in the step S102 and imported American waste pulp (40 wt%) obtained in the step S103 in a paper machine pulp tank, mixing in the paper machine pulp tank, adding 0.5% of cationic starch, 0.35% of cationic polyacrylamide, 1.1% of cationic rosin gum, 0.4% of polyaluminum chloride and 0.2% of anionic polyacrylamide, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye brilliant-xiu GN in total, and then entering a streaming system through a pressure screen to serve as bottom pulp.
Example 5
Other steps are the same as in example 1, except that the slurry ratio is slightly adjusted:
s202, mixing natural-color softwood pulp (40 wt%) treated in the step S101, domestic waste pulp (30 wt%) obtained in the step S102 and imported American waste pulp (30 wt%) obtained in the step S103 in a paper machine pulp tank.
S203. mixing the natural-color softwood pulp (60 wt%) treated in step S101, the domestic waste pulp (20 wt%) obtained in step S102, and the imported waste pulp (20 wt%) obtained in step S103 in a paper machine chest.
Comparative example 1 (Whole wood pulp)
Other steps are the same as in example 1, except that:
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a papermaking front tank, simultaneously adding 4.6% of a reinforcing agent, 0.9% of an alkyl ketene dimer sizing agent, 0.15% of cationic polyacrylamide and 0.5% of anionic polyacrylamide according to the mass of the pulp, adding 0.15% of a proper amount of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye yantexiu GN, and then entering a streaming system through a pressure screen to serve as flour, core and bottom pulp respectively to form full wood pulp.
Comparative example 2
The craft paper comprises a surface layer, a core layer and a bottom layer, and the preparation method comprises the following steps:
s1, pulping, which comprises the following steps:
s101, crushing natural-color softwood pulp by a pulper, removing slag by a high-concentration sand remover, and pulping by a large-taper refiner to obtain softwood pulp, wherein the crushing concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 30 DEG SR;
s102, crushing domestic waste paper by a pulper, removing slag by a high-concentration sand remover, screening by a grading sieve, purifying, concentrating, thermally dispersing, pulping to obtain waste paper pulp, wherein the crushing concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, crushing the damaged paper produced in the processes of the wire section, the press section, the front drying section, the rear drying section and the coiling, and concentrating to obtain damaged paper pulp;
s2, slurry mixing and flowing, which comprises the following steps:
s201, adding natural-color softwood pulp (20wt%) processed in the step S101 and domestic waste paper pulp (80wt%) obtained in the step S102 into a pre-papermaking pond, adding 5% of reinforcing agent, 0.05% of cationic polyacrylamide and 0.6% of anionic polyacrylamide relative to the mass of the pulp, adding 0.15% of liquid red dye (cationic red K28) BMC and yellow dye (cationic yellow DGL) BMC together, and then entering a streaming system through a pressure screen to serve as surface-layer pulp;
s202, pumping domestic waste paper pulp obtained in the step S102 into a paper machine pulp pool, simultaneously adding 0.5% of polyacrylamide reinforcing agent, 0.4% of cationic polyacrylamide and 0.2% of anionic polyacrylamide relative to the mass of mixed pulp, adding 0.15% of a proper amount of liquid red dye, yellow dye BMC and black dye, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, pumping the domestic waste paper pulp obtained in the step S102 into a paper machine pulp pool, simultaneously adding 0.5% of polyacrylamide reinforcing agent, 0.4% of cationic polyacrylamide and 0.2% of anionic polyacrylamide relative to the mass of the mixed pulp, adding 0.15% of liquid red dye, yellow dye BMC and black dye together, and then entering a streaming system through a pressure screen to serve as core pulp;
s3, making paper, comprising the following steps of:
s301, respectively feeding the three layers of slurry passing through the flow system into a surface layer, a core layer and a bottom layer slurry box, then carrying out net surfing and dehydration, wherein the concentration of the net surfing slurry is 0.5%, the speed difference of the slurry net is 30m/min, the proportion of dilution water is 10%, the vacuum degree of a net part forming roller is 10kPa, the vacuum degree of a wet forming box is 10kPa, the vacuum degree of a wet suction box is 20kPa, the vacuum degree of a vacuum couch roller is 50kPa, and the vacuum degree of a high vacuum water absorption box is 50kPa;
s302, conveying the wet paper sheet dehydrated and formed by the wire part to a press part for press dehydration, wherein the pressing line pressure of a first press shoe is 930kN/m, the pressing line pressure of a second press shoe is 980kN/m, and the dryness of the paper sheet discharged from the press part is 50%;
s303, conveying the pressed wet paper sheet to a front drying part for front drying, conveying the wet paper sheet to a sizing machine for sizing after the drying is finished, and conveying the wet paper sheet to a rear drying part for sizing and drying, wherein the pressure of a roller-to-roller nip of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150kPa;
s304, delivering the paper dried by the post-drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calendering hot roller is 130 ℃, the line pressure of a nip is 50kN/m, and then coiling the paper to obtain the common kraft paper.
Comparative example 3
S1, pulping, which comprises the following steps:
s101, crushing natural-color softwood pulp by a pulper, removing slag by a high-concentration sand remover, and pulping by a large-taper refiner to obtain softwood pulp, wherein the crushing concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 19 DEG SR;
s102, crushing domestic waste paper by a pulper, removing slag by a high-concentration sand remover, screening by a grading sieve, purifying, concentrating, thermally dispersing, pulping to obtain waste paper pulp, wherein the crushing concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, crushing the damaged paper produced in the processes of the wire section, the press section, the front drying section, the rear drying section and the coiling, and concentrating to obtain damaged paper pulp;
s2, slurry mixing and flowing, which comprises the following steps:
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a papermaking front tank, simultaneously adding 1% of reinforcing agent, 0.05% of cationic polyacrylamide and 0.6% of anionic polyacrylamide, adding 0.1% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye yante-XiuGN into the slurry to serve as surface layer slurry through a pressure screen;
s202, pumping the domestic waste paper pulp obtained in the step S102 into a paper machine pulp tank, simultaneously adding 0.5% of reinforcing agent polyacrylamide, 0.5% of cationic starch, 0.4% of cationic polyacrylamide, 0.2% of anionic polyacrylamide and 0.1% of polyaluminium chloride, wherein the total mass of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye yante-show GN is 0.15%, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, pumping the domestic waste paper pulp obtained in the step S102 into a paper machine pulp pond, simultaneously adding 0.5% of reinforcing agent polyacrylamide, 0.5% of cationic starch, 0.4% of anionic polyacrylamide, 0.1% of polyaluminum chloride and 0.2% of cationic polyacrylamide, wherein the total mass of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye gorgeous XiuGN is 0.15%, and then entering a streaming system through a pressure screen to serve as bottom pulp;
s3, making paper, comprising the following steps of:
s301, respectively feeding the three layers of slurry passing through the flow system into a surface layer, a core layer and a bottom layer slurry box, then carrying out net surfing and dehydration, wherein the concentration of the net surfing slurry is 0.5%, the speed difference of the slurry net is 30m/min, the proportion of dilution water is 10%, the vacuum degree of a net part forming roller is 10kPa, the vacuum degree of a wet forming box is 10kPa, the vacuum degree of a wet suction box is 20kPa, the vacuum degree of a vacuum couch roller is 50kPa, and the vacuum degree of a high vacuum water absorption box is 50kPa;
s302, conveying the wet paper sheet dehydrated and formed by the wire part to a press part for press dehydration, wherein the pressing line pressure of a first press shoe is 930kN/m, the pressing line pressure of a second press shoe is 980kN/m, and the dryness of the paper sheet discharged from the press part is 50%;
s303, conveying the pressed wet paper sheet to a front drying part for front drying, conveying the wet paper sheet to a sizing machine for sizing after the drying is finished, and conveying the wet paper sheet to a rear drying part for sizing and drying, wherein the pressure of a roller-to-roller nip of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150kPa;
s304, delivering the paper dried by the post-drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calender hot roller is 130 ℃, the line pressure of a nip is 50kN/m, and then coiling the paper to obtain the kraft paper.
TABLE 1
As can be seen from the example data, the invention adopts the adjustment and use of the sizing agent, the reasonable addition of the papermaking chemical additive and the adjustment of the proper preparation process, and the high-strength kraft liner board with the ration of 110-330g/m is obtained 2 The burst index reaches 4.0-5.6 KPa.m 2 And/g. Has good moisture resistance, and the water absorption value of the Cobb method for 30 minutes is less than or equal to 150g/m 2 . Has beautiful cloud-like wood grain appearance. The whole wood pulp of example 4 is used as a face, core and bottom pulp kraft paper, and has higher transverse folding endurance, lower ring crush index and slightly higher cost.
As can be seen from fig. 3, the surface of the high-strength kraft liner board (lower paper) prepared by the invention has beautiful lines, and is attractive and elegant.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Claims (4)
1. The preparation method of the high-strength kraft liner board is characterized by comprising pulping, pulp mixing and papermaking processes; the method specifically comprises the following steps:
s1, pulping;
s101, crushing natural-color softwood pulp by a pulper, removing slag by a high-concentration sand remover, and pulping by a large-taper refiner to obtain softwood pulp, wherein the crushing concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 19 DEG SR;
s102, crushing domestic waste paper by a pulper, removing slag by a high-concentration sand remover, screening by a grading sieve, purifying, concentrating, thermally dispersing, pulping to obtain waste paper pulp, wherein the crushing concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, crushing the imported waste pulp board by a pulper, removing slag by a high-concentration sand remover, and pulping by a double-disc pulping machine to obtain imported waste pulp, wherein the crushing concentration of the imported waste pulp is 6.0%, and the beating degree after grinding is 25 DEG SR;
s104, crushing the damaged paper produced in the processes of the wire section, the press section, the front drying section, the rear drying section and the coiling, and concentrating to obtain damaged paper pulp;
s2, slurry flow is carried out;
s201, regulating the concentration of the softwood pulp prepared in the step S101 to a papermaking front tank, simultaneously adding 1% of polyacrylamide reinforcing agent, 0.5% of alkyl ketene dimer, 0.05% of cationic polyacrylamide, 0.6% of anionic polyacrylamide, and 0.1% of liquid red dye, yellow dye and black dye which are relative to the mass of the pulp, and then entering a streaming system through a pressure screen to serve as surface pulp;
s202, mixing the softwood pulp treated in the step S101, the waste paper pulp obtained in the step S102 and the imported American waste pulp obtained in the step S103 in a pulp tank of a paper machine, adding 0.35% of cationic polyacrylamide, 0.5% of cationic starch, 1.2% of cationic rosin size, 0.5% of polyaluminium chloride, 0.2% of anionic polyacrylamide, 0.15% of liquid red dye, yellow dye and black dye, and then entering a streaming system through a pressure screen to serve as core pulp;
s203, mixing the softwood pulp treated in the step S101, the waste paper pulp obtained in the step S102 and the imported American waste pulp obtained in the step S103 in a pulp tank of a paper machine, adding 0.5% of cationic starch, 0.35% of cationic polyacrylamide, 1.1% of cationic rosin size, 0.4% of polyaluminium chloride, 0.2% of anionic polyacrylamide, 0.15% of liquid red dye, yellow dye and black dye, and then entering a streaming system through a pressure screen to serve as bottom pulp;
s3, manufacturing paper with pulp;
s301, respectively feeding the three layers of slurry passing through the flow system into a surface layer, a core layer and a bottom layer slurry box, then carrying out net surfing and dehydration, wherein the concentration of the net surfing slurry is 0.5%, the speed difference of the slurry net is 30m/min, the proportion of dilution water is 10%, the vacuum degree of a net part forming roller is 10kPa, the vacuum degree of a wet forming box is 10kPa, the vacuum degree of a wet suction box is 20kPa, the vacuum degree of a vacuum couch roller is 50kPa, and the vacuum degree of a high vacuum water suction box is 50kPa;
s302, conveying the wet paper sheet dehydrated and formed by the wire part to a press part for press dehydration, wherein the pressing line pressure of a first press shoe is 930kN/m, the pressing line pressure of a second press shoe is 980kN/m, and the dryness of the paper sheet discharged from the press part is 50%;
s303, conveying the pressed wet paper sheet to a front drying part for front drying, conveying the wet paper sheet to a sizing machine for sizing after the drying is finished, and conveying the wet paper sheet to a rear drying part for sizing and drying, wherein the pressure of a roller-to-roller nip of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150kPa;
s304, delivering the paper dried by the post-drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calender hot roller is 130 ℃, the line pressure of a nip is 50kN/m, and then coiling the paper to obtain the high-strength kraft paper;
in the step S202, the mass ratio of the softwood pulp processed in the step S101, the waste paper pulp obtained in the step S102 and the imported metawaste pulp obtained in the step S103 is 50:40:10;
in step S203, the mass ratio of the softwood pulp processed in step S101, the waste paper pulp obtained in step S102, and the imported waste pulp obtained in step S103 is 40:20:40.
2. the method of claim 1, wherein in the step S303, the size used in the size layer is a mixture solution of modified starch and surface sizing agent, the modified starch comprises 80 to 90 parts by weight based on 100 parts by weight of the sum of the modified starch and the surface sizing agent, the balance is the surface sizing agent, and the total weight percentage concentration of the modified starch and the surface sizing agent in the size used in the front size layer is 6 to 11%.
3. A high strength kraft liner prepared according to the method for preparing a high strength kraft liner of any one of claims 1 or 2.
4. A high strength kraft liner as claimed in claim 3 for use in refrigeration and long haul marine packaging.
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