CN114481659A - High-strength craft paper and production process thereof - Google Patents
High-strength craft paper and production process thereof Download PDFInfo
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- CN114481659A CN114481659A CN202210008510.8A CN202210008510A CN114481659A CN 114481659 A CN114481659 A CN 114481659A CN 202210008510 A CN202210008510 A CN 202210008510A CN 114481659 A CN114481659 A CN 114481659A
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- 238000004513 sizing Methods 0.000 claims abstract description 65
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- 239000010791 domestic waste Substances 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 239000000975 dye Substances 0.000 claims abstract description 43
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 39
- 238000004537 pulping Methods 0.000 claims abstract description 38
- 239000002699 waste material Substances 0.000 claims abstract description 38
- 239000010410 layer Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000012792 core layer Substances 0.000 claims abstract description 30
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- 239000002994 raw material Substances 0.000 claims abstract description 22
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- 238000007710 freezing Methods 0.000 claims abstract description 6
- 239000000123 paper Substances 0.000 claims description 103
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- 238000003825 pressing Methods 0.000 claims description 36
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- 125000000129 anionic group Chemical group 0.000 claims description 21
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Images
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 craft paper is prepared by pulping, pulp preparation and drifting and paper making processes. The high-strength craft paper is prepared from raw materials including pulp and papermaking chemical additives, wherein the pulp includes softwood pulp, domestic waste paper pulp and imported American waste pulp; the chemical additives include one or more of reinforcing agents, retention aids, sizing agents, dyes. The bursting index of the high-strength craft paper prepared by the invention reaches 4.0-5.6 KPa.m2The folding endurance is more than 150 times. Meanwhile, the high-strength craft paper prepared by the invention has good moisture resistance, is suitable for freezing and long-distance shipping, 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 craft paper and a preparation method thereof.
Background
The craft paper is one kind of packing paper, and is mainly adhered to corrugated paper core to form corrugated paper box for packing household appliances, daily-use general goods, knitted cotton fabric, cultural goods, outer packing of Chinese and Western patent medicine, etc. and is closely related to the development of people's daily life and national economy. Compared with the common case board, the high-strength craft paper is tougher and stiffer, has higher bursting strength, puncture resistance strength and folding strength, has the characteristics of good moisture resistance, good appearance quality and the like, and has stronger competitive advantages in the manufacturing fields of foreign trade packaging cartons and domestic high-grade commodity packaging cartons.
Most of the kraft paper produced in China has high waste paper content and low wood pulp content, is limited by raw materials and technologies, and cannot achieve high strength and high moisture resistance. The product strength is low, and the domestic product burst index can generally reach 3.8 KPa.m to the maximum2(g), the paper cannot reach the high-strength packing box, and the moisture absorption resistance is poor.
In the prior art, secondary fibers, specific reinforcing agents and other technical schemes are adopted for improving the strength, but the burst index of the obtained craft paper is still lower than 4.0 KPa.m2The container is not suitable for being used as a high-grade packing box such as a large-scale bearing box; but also has limited improvement on the moisture-proof effect, and particularly can not solve the problem that the box is easy to collapse due to moisture absorption in the process of shipping, freezing and packaging; meanwhile, the craft paper 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 is of great significance.
Disclosure of Invention
The method adopts proper fiber and chemical raw material matching and proper production technology to produce the high-strength cardboard paper product; by adjusting the pulping and papermaking forming processes, the front side of the product has special wood texture and the appearance is beautiful and elegant. Meanwhile, the product has good moisture absorption resistance by adjusting the sizing process, and is suitable for freezing and long-distance shipping.
The high-strength craft paper comprises a surface layer, a core layer and a bottom layer. The high-strength craft paper is prepared by pulping, pulp preparation and drifting and paper making processes.
The high-strength craft paper is prepared from raw materials including pulp and papermaking chemical additives, wherein the pulp includes softwood pulp, domestic waste paper 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, and a reinforcing agent, a retention aid, a sizing agent and a dye are added to obtain surface layer pulp;
the core layer is prepared by mixing softwood pulp, domestic waste paper pulp and/or imported American waste pulp according to a certain proportion, and adding a reinforcing agent, a retention aid, a sizing agent and a dye to obtain core layer pulp;
in the core layer mixed raw material (the raw material is 100 percent of the reference), the softwood pulp accounts for 30 to 100 percent by weight, the domestic waste paper pulp accounts for 0 to 70 percent, and the imported American waste pulp accounts for 0 to 80 percent.
Preferably, the softwood pulp accounts for 50-70 wt%, and other raw materials are domestic waste paper pulp and/or imported American waste pulp.
In the mixed pulp of the core layer, softwood pulp, domestic waste paper pulp and imported American waste pulp form a composite system, the softwood pulp is a main component, and if the proportion is too low, the adverse effect that the rupture strength is low and the standard cannot be reached is caused. Besides softwood pulp, one or two of domestic waste paper pulp and imported American waste pulp can be used to form a system with the softwood pulp. Therefore, the core layer 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 the liquid red dye (cationic red K28) BMC, the yellow dye (cationic yellow DGL) BMC, and the black dye British elegant GN.
Optionally, 0-0.2% of other additives such as polyaluminium chloride or polyaluminium sulfate can be added into the core layer mixed slurry to neutralize the anion of the system; or cationic starch, has strengthening and retention effects.
The bottom layer is prepared by mixing softwood pulp, domestic waste paper pulp and/or imported American waste pulp according to a certain proportion, and adding a reinforcing agent, a retention aid, a sizing agent and a dye to obtain bottom layer pulp.
In the mixed raw materials of the bottom layer (the raw materials are 100 percent of the reference), the softwood pulp accounts for 30 to 100 percent by weight, the domestic waste paper pulp accounts for 0 to 70 percent, and the imported American waste pulp accounts for 0 to 80 percent.
The core layer raw material and the bottom layer raw material can be the same or different.
Preferably, the softwood pulp accounts for 50-70 wt%, and other raw materials are domestic waste paper pulp and/or imported American waste pulp.
In the bottom layer mixed slurry, softwood pulp, domestic waste paper pulp and imported American waste pulp form a composite system, the softwood pulp is a main component, and if the proportion is too low, the adverse effect that the rupture strength is low and the standard cannot be reached is caused. Besides softwood pulp, one or two of domestic waste paper pulp and imported American waste pulp can be used to form a system with the softwood pulp. Therefore, the base 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 the liquid red dye (cationic red K28) BMC, the yellow dye (cationic yellow DGL) BMC, and the black dye British elegant GN.
Optionally, 0-0.2% of other auxiliary agents such as polyaluminium chloride or polyaluminium sulfate can be added into the bottom mixed slurry to neutralize the anion of the system; or cationic starch, has strengthening and retention effects.
The pulping, slurry distribution and flow conveying and papermaking process of the invention means that surface layer slurry, core layer slurry and bottom layer slurry are respectively prepared and distributed, and three layers of slurry are respectively subjected to papermaking.
Specifically, the pulping comprises the following steps:
s101, pretreatment of softwood pulp:
the raw materials are crushed, deslagged and ground into pulp to obtain the preprocessed softwood chemical pulp.
The raw materials comprise self-made or commercial natural color softwood chemical pulp.
The disintegration concentration of the chemical pulp of the needle-leaved 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 subjected to crushing, deslagging, grading screening, purifying, concentrating, thermal dispersing and pulping to obtain domestic waste paper pulp.
The domestic waste paper pulp has a breaking concentration of 8.0% and a beating degree of 25-45 DEG SR after grinding.
S103, preparing domestic waste paper pulp:
and (3) crushing, deslagging and grinding the imported American waste pulp board to obtain the imported American waste pulp.
The disintegration concentration of the waste pulp board is 3.2-5.5%, and the beating degree after grinding is 18-35 DEG SR.
S104, utilization of the broken pulp: the broke produced in the above process is crushed and concentrated to obtain broke pulp, and the broke pulp can be recycled by mixing with national waste pulp or separately treating.
The slurry preparation method comprises the following steps:
s201, pumping the softwood pulp prepared in the step S101 into a pre-papermaking pool, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye, and entering a flow system to obtain surface layer pulp.
The addition amount of the reinforcing agent is 0-6 wt% of softwood pulp; the addition amount of the sizing agent is 0-1.5 wt% of the softwood pulp; the addition amount of the retention aid is 0-1.1 wt% of the softwood pulp; the dye is added in an amount of 0.01-0.2 wt% of softwood pulp.
S202, mixing the softwood pulp processed in the step S101, the domestic waste paper pulp obtained in the step S102 and/or the imported American waste pulp obtained in the step S103 to obtain mixed pulp, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye, and entering a flow system to obtain core layer pulp.
The addition amount of the reinforcing agent is 0-6 wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5 wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1 wt% of the mixed slurry; the adding amount of the dye is 0.01-0.2 wt% of the mixed slurry.
S203, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye into the natural color softwood pulp processed in the step S101, the domestic waste paper pulp obtained in the step S102 and/or the imported American waste pulp mixed pulp obtained in the step S103, and entering a flow system to obtain bottom pulp.
The addition amount of the reinforcing agent is 0-6 wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5 wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1 wt% of the mixed slurry; the adding amount of the dye is 0.01-0.2 wt% of the mixed slurry.
The papermaking method comprises the following steps:
s301, respectively dehydrating and forming the three layers of pulp to obtain wet paper sheets;
feeding the slurry of the three layers passing through the flow feeding system into a surface layer slurry box, a core layer slurry box and a bottom layer slurry box respectively, and then, carrying out online dewatering, wherein the concentration of the online 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 dewatering the dewatered and formed wet paper:
delivering the wet paper sheet dehydrated and formed by the net part to a pressing part for pressing and dehydrating, wherein the pressing pressure of a first pressing shoe is 800-1050kN/m, the pressing pressure of a second pressing shoe is 800-1050kN/m, and the dryness of the paper sheet out of the pressing part is 48-52%;
and S303, pre-drying the squeezed wet paper, conveying to a sizing machine for sizing after drying is finished, and then drying after sizing.
The glue used for the sizing layer is a mixture solution of modified starch and a surface sizing agent, the modified starch accounts for 80-90 parts by weight and the balance is the surface sizing agent based on 100 parts by weight of the sum of the modified starch and the surface sizing agent, and the total weight percentage concentration of the modified starch and the surface sizing agent in the glue used for the front sizing layer is 6-11%.
S304, calendering the paper after drying, wherein the surface temperature of a hard calendering photo-thermal roller is 80-170 ℃, the linear pressure of a nip is 20-130kN/m, and then reeling the paper to obtain the high-strength craft paper.
S305, collecting and recycling fibers generated in the papermaking process, and using the fibers together with domestic waste paper pulp in the step S103 to form recycling.
The quantitative ratio of the prepared high-strength craft paper is 110-2The burst index reaches 4.0-5.6 KPa.m2/g。
Meanwhile, the high-strength craft paper prepared by the invention has good moisture resistance, and the water absorption value of the Cobb method in 30 minutes is less than or equal to 150g/m2。
Furthermore, the prepared high-strength craft paper has beautiful cloud-shaped wood grain appearance.
The invention has the beneficial effects that:
1. the invention strictly controls the composition and proportion of the raw materials of the surface layer, the core layer and the bottom layer, combines and adds the softwood pulp, the national waste and the American waste and the matching and the addition of chemical additives (reinforcing agent, sizing agent and the like), adopts a proper production process to produce a high-strength cardboard paper product, and has the advantages of high strength and burst index reaching 4.0-5.6 KPa.m2The folding endurance is generally more than 150 times, and is far higher than the breaking endurance index (3.8 KPa.m) of similar products in China2,/g), conventional level of folding endurance (80 times).
2. The invention adopts the raw material composition to prepare a proper sizing agent, and matches with the sizing process in the papermaking process, so that the product has good moisture absorption resistance, the water absorption value of the Cobb method in 30 minutes is less than or equal to 150g/m2, the product is suitable for freezing and long-distance shipping, and can be completely suitable for high-grade packaging purposes such as freezing packaging, shipping packaging and the like, and the product can not collapse due to moisture absorption.
3. The invention makes full use of raw materials, simultaneously utilizes national waste paper pulp, American waste paper pulp and fibers and damaged pulp generated in the preparation process per se for secondary utilization, prepares strength with more excellent performance, not only improves the utilization rate of the raw materials, but also recycles the pulp in the production process, reduces the processes of discharge post-treatment and the like, and greatly reduces the production cost.
4. The high-strength craft paper prepared by the invention has beautiful appearance and special cloud-shaped 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 exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a flow sheet for the paper machine according to the invention.
FIG. 2 is a process flow diagram of the wastepaper pulping process of the present invention.
FIG. 3 is a graph comparing the kraft liner prepared in comparative example 1 (top) and example 1 (bottom) according to the present invention.
FIG. 4 shows that the high-strength craft paper is prepared by the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The high-strength craft paper comprises a surface layer, a core layer and a bottom layer, wherein the preparation raw materials comprise pulp and papermaking chemicals, and the preparation method comprises the following steps:
s1, pulping, comprising the following steps:
s101, subjecting natural color softwood pulp to pulping by a pulper, removing residues by a high-concentration desander, and pulping by a high-taper refiner to obtain softwood pulp, wherein the pulping concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 19-degree SR;
s102, domestic waste paper is pulped by a pulper, then slag is removed by a high-concentration desander, and then the domestic waste paper is graded by a grading sieve, screened, purified, concentrated, thermally dispersed and ground to obtain waste paper pulp, wherein the pulping concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, pulping the imported American waste pulp board by a pulper, removing slag by a high-concentration desander, and pulping by a double-disc pulping machine to obtain imported American waste pulp, wherein the pulping concentration of the American waste pulp board is 6.0%, and the beating degree after grinding is 25-degree SR;
s104, breaking broke generated in the process of the net section, the pressing section, the front drying section, the rear drying section and the coiling section, and then concentrating to obtain broke pulp;
s2, slurry distribution and flow conveying, comprising the following steps:
s201, adjusting the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pool, adding 1% of polyacrylamide reinforcing agent, 0.5% of alkyl ketene dimer, 0.05% of cationic polyacrylamide and 0.6% of anionic polyacrylamide, and simultaneously adding 0.1% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN relative to the mass of the pulp, and then feeding the mixture into a flow system through a pressure screen to be used as surface layer pulp;
s202, mixing the natural color softwood pulp (50 wt%), the domestic waste paper pulp (30 wt%) obtained in the step S102 and the imported American waste pulp (20 wt%) obtained in the step S103 in a paper machine pulp tank, 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, 0.1% of polyaluminium chloride, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN in total relative to the mass of the mixed pulp, and then feeding the mixture into a flow system through a pressure screen to serve as core layer pulp;
s203, mixing the natural color softwood pulp (50 wt%), the domestic waste paper pulp (20 wt%) obtained in the step S102 and the imported American waste pulp (30 wt%) obtained in the step S103 in a paper machine pulp chest, and 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, 0.2% of cationic polyacrylamide, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Yantexiu GN which are relative to the mass of the mixed pulp, and then feeding the mixture into a flow system through a pressure screen to serve as bottom layer pulp;
s3, papermaking, comprising the following steps:
s301, feeding the three layers of slurry passing through the flow conveying system into a surface layer slurry box, a core layer slurry box and a bottom layer slurry box respectively, and then, carrying out net surfing dehydration, wherein the concentration of the net surfing slurry is 0.5%, the speed difference of a slurry net is 30 m/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 suction box is 50 kPa;
s302, conveying the wet paper sheet dehydrated and formed by the net part to a pressing part for pressing and dehydrating, wherein the line pressing pressure of a first pressing shoe is 930kN/m, the line pressing pressure of a second pressing shoe is 980kN/m, and the dryness of the paper sheet discharged from the pressing part is 50%;
s303, conveying the squeezed wet paper to a front drying part for front drying, conveying to a sizing machine for sizing after drying is finished, conveying to a rear drying part for sizing and then drying, wherein the pressure of an inter-roller pressing area of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150 kPa;
s304, conveying the paper dried by the rear drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calendering hot roller is 130 ℃, the linear pressure of a press area is 50kN/m, and then reeling the paper to obtain the high-strength craft paper;
s305, filtering white water generated in the net part and the press part in the papermaking process by a multi-disc filter, collecting recycled fibers by a fiber recycling tank to obtain recycled fibers, and pumping recycled fiber pulp into the step S103 by a pump to be used together with domestic waste paper pulp.
Example 2
The preparation method of the high-strength craft paper comprises the following steps:
s1, pulping, comprising the following steps:
s101, subjecting natural color softwood pulp to pulping by a pulper, removing residues by a high-concentration desander, and pulping by a high-taper refiner to obtain softwood pulp, wherein the pulping concentration of the softwood pulp is 6.0%, and the beating degree after grinding is 15-degree SR;
s102, domestic waste paper is pulped by a pulper, then slag is removed by a high-concentration desander, and then the domestic waste paper is graded by a grading sieve, screened, purified, concentrated, thermally dispersed and ground to obtain waste paper pulp, wherein the pulping concentration of the waste paper pulp is 7.0%, and the beating degree after grinding is 33 DEG SR;
s103, pulping the imported American waste pulp board by a pulper, removing slag by a high-concentration desander, and pulping by a double-disc pulping machine to obtain imported American waste pulp, wherein the pulping concentration of the American waste pulp board is 6.0%, and the beating degree after grinding is 26-degree SR;
s104, breaking broke generated in the process of the net section, the press section, the front drying section, the rear drying section and the coiling section, and then concentrating to obtain broke pulp.
S2, slurry distribution and flow conveying, comprising the following steps:
s201, adjusting the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pool, simultaneously adding 1.1% of alkyl ketene dimer sizing agent, 0.5% of cationic polyacrylamide and 0.3% of anionic polyacrylamide relative to the mass of the pulp, and a proper amount of 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN, and then entering a flow system through a pressure screen to serve as surface layer pulp;
s202, mixing the 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, 0.6% of anionic polyacrylamide, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN in mass, and then feeding the mixture into a flow system through a pressure screen to serve as core layer pulp;
s203, mixing the 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, 0.6% of anionic polyacrylamide, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN in mass, and then feeding the mixture into a flow system through a pressure screen to serve as bottom layer pulp;
s3, the manufacturing steps are the same as the embodiment 1.
Example 3
The steps S1 and S3 are the same as those in example 1.
S2, slurry distribution and flow conveying, comprising the following steps:
s201, adjusting the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pool, 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, relative to the mass of the pulp, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British GN, and then entering a flow system through a pressure screen to serve as surface layer pulp;
s202, mixing the unbleached softwood pulp (50%) treated in the step S101 and imported American waste pulp (50%) obtained in the step S103 in a paper machine pulp tank, adding 5% of reinforcing agent, 0.08% of Alkenyl Succinic Anhydride (ASA) sizing agent, 0.4% of cationic polyacrylamide and 0.5% of anionic polyacrylamide relative to the mass of the pulp, and then feeding the mixture into a flow system through a pressure screen to serve as core layer pulp, wherein the total content of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN is 0.15%;
s203, mixing the unbleached softwood pulp (60%) treated in the step S101 and imported American waste pulp (40%) obtained in the step S103 in a paper machine pulp tank, simultaneously adding 5.5% of reinforcing agent, 0.1% of Alkenyl Succinic Anhydride (ASA) sizing agent, 0.45% of cationic polyacrylamide and 0.6% of anionic polyacrylamide relative to the mass of the pulp, and then feeding the mixture into a flow system through a pressure screen to serve as bottom pulp, wherein the total content of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN is 0.15%.
Example 4
The other steps are the same as example 1, and only differ:
s202, mixing the natural color softwood pulp (50 wt%), the domestic waste paper pulp (40 wt%) obtained in the step S102 and the imported American waste paper pulp (10 wt%) obtained in the step S103 in a paper machine pulp tank, mixing in the paper machine pulp tank, simultaneously adding 0.35% of cationic polyacrylamide, 0.5% of cationic starch, 1.2% of cationic rosin size, 0.5% of polyaluminium chloride and 0.2% of anionic polyacrylamide relative to the mass of pulp, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Yantexiu GN together, and then entering a flow system through a pressure screen to be used as core layer pulp;
s203, mixing the natural color softwood pulp (40 wt%), the domestic waste paper pulp (20 wt%) obtained in the step S102 and the imported American waste paper pulp (40 wt%) obtained in the step S103 in a paper machine pulp tank, mixing in the paper machine pulp tank, simultaneously adding 0.5% of cationic starch, 0.35% of cationic polyacrylamide, 1.1% of cationic rosin size, 0.4% of polyaluminium chloride and 0.2% of anionic polyacrylamide relative to the mass of pulp, adding 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Yantexiu GN together, and then entering a flow system through a pressure screen to be used as bottom layer pulp.
Example 5
The other steps are the same as the example 1, and the difference is only that the slurry proportion is slightly adjusted:
s202, mixing the natural color softwood pulp (40 wt%) treated in the step S101, domestic waste paper 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 chest.
S203, mixing the natural color softwood pulp (60 wt%) treated in the step S101, domestic waste paper pulp (20 wt%) obtained in the step S102 and imported American waste pulp (20 wt%) obtained in the step S103 in a paper machine pulp chest.
COMPARATIVE EXAMPLE 1 (Whole wood pulp)
The other steps are the same as example 1, except that:
s201, adjusting the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pool, simultaneously adding 4.6% of reinforcing agent, 0.9% of alkyl ketene dimer sizing agent, 0.15% of cationic polyacrylamide, 0.5% of anionic polyacrylamide, and a proper amount of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN which are 0.15% relative to the mass of the pulp, and then feeding the mixture into a flow system through a pressure screen to be respectively used as surface pulp, core pulp and bottom pulp to form whole 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, comprising the following steps:
s101, subjecting natural color softwood pulp to pulping by a pulper, removing slag by a high-concentration desander, and pulping by a high-taper refiner to obtain softwood pulp, wherein the pulping concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 30-degree SR;
s102, domestic waste paper is pulped by a pulper, then slag is removed by a high-concentration desander, and then the domestic waste paper is graded by a grading sieve, screened, purified, concentrated, thermally dispersed and ground to obtain waste paper pulp, wherein the pulping concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, breaking broke generated in the process of the net section, the press section, the front drying section, the rear drying section and the coiling section, and then concentrating to obtain broke pulp;
s2, slurry distribution and flow conveying, comprising the following steps:
s201, adding the natural color softwood pulp (20 wt%) treated in the step S101 and domestic waste paper pulp (80 wt%) obtained in the step S102 to a pre-papermaking tank, simultaneously adding a reinforcing agent accounting for 5% of the mass of the pulp, cationic polyacrylamide accounting for 0.05% of the mass of the pulp, anionic polyacrylamide accounting for 0.6% of the mass of the pulp, and a liquid red dye (cationic red K28) BMC and a yellow dye (cationic yellow DGL) BMC accounting for 0.15% of the mass of the pulp, and then feeding the pulp into a flow 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 tank, 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, and 0.15% of proper amount of liquid red dye, yellow dye BMC and black dye into a flow system through a pressure screen to serve as core layer pulp;
s203, pumping the domestic waste paper pulp obtained in the step S102 into a paper machine pulp tank, 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, and 0.15% of liquid red dye, yellow dye BMC and black dye into the paper machine pulp tank, and then feeding the mixture into a flow system through a pressure screen to be used as core layer pulp;
s3, papermaking, comprising the following steps:
s301, slurry of the three layers passing through a flow conveying system is respectively conveyed into a surface layer slurry box, a core layer slurry box and a bottom layer slurry box, then, the slurry is subjected to net surfing and dehydration, the concentration of the slurry on the net is 0.5%, the speed difference of a slurry net is 30 m/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 suction box is 50 kPa;
s302, conveying the wet paper sheet dehydrated and formed by the net part to a pressing part for pressing and dehydrating, wherein the line pressing pressure of a first pressing shoe is 930kN/m, the line pressing pressure of a second pressing shoe is 980kN/m, and the dryness of the paper sheet discharged from the pressing part is 50%;
s303, delivering the squeezed wet paper to a front drying part for front drying, delivering the wet paper to a sizing machine for sizing after the drying is finished, delivering the wet paper to a rear drying part for sizing and then drying, wherein the pressure of an inter-roller pressing area of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150 kPa;
s304, conveying 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 linear pressure of a press area is 50kN/m, and then reeling the paper to obtain the common craft paper.
Comparative example 3
S1, pulping, comprising the following steps:
s101, subjecting natural color softwood pulp to pulping by a pulper, removing residues by a high-concentration desander, and pulping by a high-taper refiner to obtain softwood pulp, wherein the pulping concentration of the softwood pulp is 5.0%, and the beating degree after grinding is 19-degree SR;
s102, domestic waste paper is pulped by a pulper, then slag is removed by a high-concentration desander, and then the domestic waste paper is graded by a grading sieve, screened, purified, concentrated, thermally dispersed and ground to obtain waste paper pulp, wherein the pulping concentration of the waste paper pulp is 8.0%, and the beating degree after grinding is 30 DEG SR;
s103, breaking broke generated in the process of the net section, the press section, the front drying section, the rear drying section and the coiling section, and then concentrating to obtain broke pulp;
s2, slurry distribution and flow conveying, comprising the following steps:
s201, adjusting the concentration of the softwood pulp prepared in the step S101 to a pre-papermaking pool, simultaneously adding 1% of reinforcing agent, 0.05% of cationic polyacrylamide and 0.6% of anionic polyacrylamide relative to the mass of the pulp, 0.1% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Brilliant elegant GN, and then feeding the mixture into a feeding system through a pressure screen to be used as surface layer pulp;
s202, pumping 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, 0.1% of polyaluminium chloride, 0.15% of liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye British elegant GN into the paper machine pulp tank, and then feeding the mixture into a flow system through a pressure screen to be used as core layer pulp;
s203, pumping domestic waste paper pulp obtained in the step S102 in a paper machine pulp chest, adding 0.5% of reinforcing agent polyacrylamide, 0.5% of cationic starch, 0.4% of anionic polyacrylamide, 0.1% of polyaluminium chloride, 0.2% of cationic polyacrylamide, liquid red dye (cationic red K28) BMC, yellow dye (cationic yellow DGL) BMC and black dye Brilliant elegant GN which account for 0.15% of the mass of the mixed pulp, and then feeding the mixture into a flow system through a pressure screen to serve as bottom layer pulp;
s3, papermaking, comprising the following steps:
s301, slurry of the three layers passing through a flow conveying system is respectively conveyed into a surface layer slurry box, a core layer slurry box and a bottom layer slurry box, then, the slurry is subjected to net surfing and dehydration, the concentration of the slurry on the net is 0.5%, the speed difference of a slurry net is 30 m/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 suction box is 50 kPa;
s302, conveying the wet paper sheet dehydrated and formed by the net part to a pressing part for pressing and dehydrating, wherein the line pressing pressure of a first pressing shoe is 930kN/m, the line pressing pressure of a second pressing shoe is 980kN/m, and the dryness of the paper sheet discharged from the pressing part is 50%;
s303, delivering the squeezed wet paper to a front drying part for front drying, delivering the wet paper to a sizing machine for sizing after the drying is finished, delivering the wet paper to a rear drying part for sizing and then drying, wherein the pressure of an inter-roller pressing area of the sizing machine is 10kN/m, and the pressure between a metering rod and a sizing roller is 150 kPa;
s304, conveying the paper dried by the rear drying part to a soft calender for soft calendering, wherein the surface temperature of a soft calendering hot roller is 130 ℃, the linear pressure of a press area is 50kN/m, and then reeling the paper to obtain the craft paper.
TABLE 1
As can be seen from the data of the embodiment, the invention adopts the adjustment and use of the sizing agent, the chemical additive for papermaking and the reasonable addition, and the proper preparation process is adjusted to obtain the high-strength craft paper with the quantitative value of 110-2The burst index reaches 4.0-5.6 KPa.m2(ii) in terms of/g. Has good moisture resistance, and the water absorption value of the Cobb method in 30 minutes is less than or equal to 150g/m2. Has beautiful cloud-shaped wood grain appearance. The full wood pulp of example 4 is used as the face, core and bottom pulp craft paper, and has higher transverse folding endurance, but lower ring crush index and slightly higher cost.
As can be seen in FIG. 3, the high-strength craft paper (lower paper) prepared by the method has beautiful lines on the surface and is beautiful and elegant.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode 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/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Claims (10)
1. A high-strength craft paper is characterized by comprising a surface layer, a core layer and a bottom layer;
the high-strength craft paper is prepared by pulping, pulp distribution and drifting and paper making processes;
the high-strength craft paper comprises raw materials of pulp and papermaking chemical additives, wherein the pulp comprises softwood pulp, domestic waste paper pulp and imported American waste pulp; the chemical additives include one or more of a reinforcing agent, a retention aid, a sizing agent, a dye.
2. The high strength kraft liner board according to claim 1, wherein the face stock includes softwood pulp, strength additives, retention aids, sizing agents, dyes;
the core layer raw materials comprise softwood pulp, domestic waste paper pulp and/or imported American waste pulp, a reinforcing agent, a retention aid, a sizing agent and a dye;
the bottom layer raw materials comprise softwood pulp, domestic waste paper pulp and/or imported American waste pulp, a reinforcing agent, a retention aid, a sizing agent and a dye.
The paper ration is 110-2The burst index is 4.0-5.6 KPa.m2The water absorption value of the Cobb method in 30 minutes is less than or equal to 150g/m2。
3. The high strength craft paper according to claim 1 or 2, wherein 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 the liquid red dye (cationic red K28) BMC, the yellow dye (cationic yellow DGL) BMC and the black dye brilliant eleven GN.
4. The high strength kraft paper according to claim 1 or 2, wherein in the core layer mixed raw material, softwood pulp accounts for 30-100 wt%, preferably 50-70 wt%; the addition amount of the reinforcing agent is 0-6 wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5 wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1 wt% of the mixed slurry; the adding amount of the dye is 0.01-0.2 wt% of the mixed slurry.
5. The high strength kraft paper according to claim 1 or 2, wherein softwood pulp accounts for 30-100 wt%, preferably 50-70 wt% of the bottom ply mixed stock; the addition amount of the reinforcing agent is 0-6 wt% of the mixed slurry; the addition amount of the sizing agent is 0-1.5 wt% of the mixed sizing agent; the addition amount of the retention aid is 0-1.1 wt% of the mixed slurry; the adding amount of the dye is 0.01-0.2 wt% of the mixed slurry.
6. The high strength craft paper according to claim 1 or 2 wherein the top layer pulp, the core layer pulp and the bottom layer pulp are prepared and dispensed separately and then the three layers of pulp are manufactured separately.
7. The method for preparing the high-strength craft paper according to claim 1 or 2, characterized in that, the method comprises pulping, pulp preparation, paper making process;
the pulping process comprises the following steps:
s101, preprocessing softwood pulp;
s102, preparing domestic waste paper pulp;
s103, preparing imported American waste paper pulp;
s104, utilizing the broken paper pulp;
the slurry preparation method comprises the following steps:
s201, pumping the softwood pulp prepared in the step S101 into a pre-papermaking pool, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye, and entering a drifting system to obtain surface layer pulp;
s202, mixing the softwood pulp processed in the step S101, the domestic waste paper pulp obtained in the step S102 and/or the imported American waste pulp obtained in the step S103 to obtain mixed pulp, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye, and entering a flow system to obtain core layer pulp;
s203, adding a reinforcing agent, a sizing agent, a retention aid and a proper amount of dye into the natural color softwood pulp processed in the step S101, the domestic waste paper pulp obtained in the step S102 and/or the imported American waste pulp mixed pulp obtained in the step S103, and entering a flow system to obtain bottom pulp.
8. The method of claim 8, wherein the paper making process comprises the steps of:
s301, respectively dehydrating and forming the three layers of pulp to obtain wet paper sheets;
s302, squeezing and dewatering the dewatered and formed wet paper:
s303, pre-drying, gluing and post-drying the squeezed wet paper;
s304, calendering the paper after drying, and reeling to obtain the high-strength craft paper;
s305, collecting and recycling fibers generated in the papermaking process, and recycling the fibers together with domestic waste paper pulp in the step S103.
9. The method according to claim 7 or 8, wherein the chemical pulp degradation concentration of the pretreated softwood is 3.8 to 5.2%, and the beating degree after grinding is 15 to 28 ° SR; the domestic waste paper pulp has a breaking concentration of 8.0 percent and a beating degree of 25-45 DEG SR after grinding; the disintegration concentration of the waste pulp board is 3.2-5.5%, and the beating degree after grinding is 18-35 DEG SR;
in the step S302, squeezing and dewatering are carried out, wherein the first pressing shoe line pressing pressure is 800-1050kN/m, the second pressing shoe line pressing pressure is 800-1050kN/m, and the dryness of the paper sheet squeezing part is 48-52%;
in the step S303, the glue used in the glue layer is a mixture solution of modified starch and a surface sizing agent, the modified starch accounts for 80-90 parts by weight and the balance is the surface sizing agent based on 100 parts by weight of the sum of the modified starch and the surface sizing agent, and the total weight percentage concentration of the modified starch and the surface sizing agent in the glue used in the front surface glue layer is 6-11%.
10. The high-strength kraft paper as claimed in any one of claims 1 to 6 or the high-strength kraft paper obtained by the method of any one of claims 7 to 9, for use in freezing and packaging for long-distance shipping.
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| CN116536968A (en) * | 2023-04-07 | 2023-08-04 | 玖龙纸业（东莞）有限公司 | Method for manufacturing high-grade packaging paper by mixing Gao Kajiang with waste paper and pulping |
| CN116641254A (en) * | 2023-07-21 | 2023-08-25 | 山鹰国际控股股份公司 | Manufacturing process of cowhide cardboard paper |
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