CN114960268A - High-grade craft paper and preparation method thereof - Google Patents
High-grade craft paper and preparation method thereof Download PDFInfo
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- CN114960268A CN114960268A CN202210684164.5A CN202210684164A CN114960268A CN 114960268 A CN114960268 A CN 114960268A CN 202210684164 A CN202210684164 A CN 202210684164A CN 114960268 A CN114960268 A CN 114960268A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 59
- 239000011425 bamboo Substances 0.000 claims abstract description 92
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 91
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 91
- 241001330002 Bambuseae Species 0.000 claims abstract description 91
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 91
- 239000000123 paper Substances 0.000 claims abstract description 77
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 51
- 238000010009 beating Methods 0.000 claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 32
- 238000004537 pulping Methods 0.000 claims abstract description 32
- 239000000126 substance Substances 0.000 claims abstract description 20
- 239000011122 softwood Substances 0.000 claims abstract description 16
- 239000002655 kraft paper Substances 0.000 claims abstract description 11
- 230000018044 dehydration Effects 0.000 claims abstract description 3
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 58
- 239000000835 fiber Substances 0.000 claims description 50
- 239000002002 slurry Substances 0.000 claims description 44
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 29
- 239000012792 core layer Substances 0.000 claims description 20
- 239000010410 layer Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 239000002344 surface layer Substances 0.000 claims description 19
- 238000006277 sulfonation reaction Methods 0.000 claims description 16
- 238000004513 sizing Methods 0.000 claims description 14
- 241001397809 Hakea leucoptera Species 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 9
- 230000009172 bursting Effects 0.000 claims description 7
- 239000010791 domestic waste Substances 0.000 claims description 7
- 238000010411 cooking Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 25
- 239000002994 raw material Substances 0.000 abstract description 8
- 230000008676 import Effects 0.000 abstract description 7
- 239000003292 glue Substances 0.000 abstract 2
- 239000002893 slag Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000014509 gene expression Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000010893 paper waste Substances 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000012216 screening Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003701 mechanical milling Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- FOGYNLXERPKEGN-UHFFFAOYSA-N 3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfopropyl)phenoxy]propane-1-sulfonic acid Chemical compound COC1=CC=CC(CC(CS(O)(=O)=O)OC=2C(=CC(CCCS(O)(=O)=O)=CC=2)OC)=C1O FOGYNLXERPKEGN-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 239000012434 nucleophilic reagent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000012066 reaction slurry Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
- Paper (AREA)
Abstract
The invention relates to a high-grade craft paper and a preparation method thereof, comprising the steps of pulping, pulp preparation, net part dehydration forming, press part squeezing, front drying part drying, glue application by a glue applicator and back drying part drying; the semi-chemical bamboo pulp is adopted to replace part of OCC pulp and/or softwood pulp, the beating degree of the semi-chemical bamboo pulp is 45 DEG SR, the tensile index is more than or equal to 40N.m/g, and the burst index is more than or equal to 2.5kpa.m 2 G, folding strength is more than or equal to 30 times, tearing strength is more than or equal to 10mN.m 2 The 16-mesh sieve passing rate is more than or equal to 70 percent; the problem of unstable import wood pulp supply in the production of high-grade kraft paper can be solved, the shutdown risk caused by the shortage of imported raw materials and the problem of unstable international market price are reduced, the production cost is effectively controlled, and the production and operation risk of enterprises is reduced.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a high-grade craft paper and a preparation method thereof.
Background
At present, the fine dried noodle kraft liner board paper is generally produced by using OCC waste paper raw materials and unbleached softwood pulp in a paper mill, the fiber performance of the unbleached softwood pulp is strong, (the unbleached softwood pulp is resistant to breakage by 5.0-6.0kpa 2 (g), folding endurance of 1000 times 2400 times, in contrast, the OCC waste paper pulp breakage index is only 1.2-1.5kpa. m 2 (g), folding endurance 5-12 times). The shortage of pine and union wood in China results in the serious shortage of unbleached softwood pulp in China, and unbleached softwood pulp used in paper mills mainly comes from the international market. This has the disadvantages of unstable supply, high cost, etc., and affects the normal production of the paper mill. The wood pulp cost is an extremely key cost item for producing the high-grade kraft liner board, the use amount of the softwood pulp is reduced, even the softwood pulp is not used, the use cost of the wood pulp is reduced, and the problem of the urgent need for solving is faced by high-grade kraft liner board production enterprises.
Disclosure of Invention
In view of the above problems, the present application provides a method for preparing high-grade craft paper, which comprises the steps of pulping, pulp preparation, wire dewatering and forming, press section pressing, front drying section drying, sizing by a sizing machine, and rear drying section drying;
wherein the pulping step comprises:
preparing refined pin wood pulp: the fine grinding pin wood pulp is obtained by adopting unbleached sulfate coniferous wood pulp and performing disintegration, high-concentration deslagging and disc grinding and pulping;
fine grinding bamboo pulp preparation: the fine grinding needle wood pulp is prepared by adopting semi-chemical bamboo pulp and obtaining fine grinding bamboo pulp after disintegration, high-concentration deslagging and disc grinding pulping; the beating degree of the half-chemical bamboo pulp is 45 DEG SR, the tensile index is more than or equal to 40N.m/g, and the burst index is more than or equal to 2.5kpa.m 2 G, folding strength is more than or equal to 30 times, tearing strength is more than or equal to 10mN.m 2 The 16-mesh sieve passing rate is more than or equal to 70 percent;
preparing OCC slurry: preparing OCC short fiber pulp, OCC medium fiber pulp and OCC long fiber pulp by using domestic waste OCC; the slurry preparation step comprises:
surface layer slurry preparation: the fine grinding of the pin-point wood pulp,
core layer slurry preparation: OCC pulp, fine-grinding bamboo pulp and broke recovery pulp,
preparing slurry at the bottom layer: finely grinding the bamboo pulp, the wood pulp of the fine grinding needle and the OCC pulp;
the craft paper is made by a three-fold net paper machine.
Different from the prior art, the technical scheme provides the preparation method of the high-grade craft paper by using the bamboo pulp, and the bamboo pulp is used for replacing part of imported wood pulp and OCC pulp, so that the problem that the imported wood pulp is unstable in supply in the production of the high-grade craft paper can be solved, the shutdown risk caused by the shortage of imported raw materials and the problem that the international market price of the shutdown risk are unstable are reduced, the production cost is effectively controlled, and the production and operation risks of enterprises are reduced.
In some embodiments, the semi-chemical bamboo pulp is obtained by cooking bamboo chips with NaOH, and Na 2 SO 3 After sulfonation treatment, grinding and decomposing.
In some embodiments, the semi-finished bamboo pulp has a degree of sulfonation of 1.5-2.2%.
In some embodiments, the OCC long fiber pulp has a degree of beating 32-40 ° SR and a wet weight of 7.0-8.0g, the OCC medium fiber pulp has a degree of beating 35-45 ° SR and a wet weight of 5.0-7.0g, and the OCC short fiber pulp has a degree of beating 40-50 ° SR and a wet weight of 4.0-5.0 g.
In some embodiments, the refiner pin pulp and the refiner bamboo pulp have a refining consistency of 4.0-4.5%, a pulp beating degree of 25-45 ° SR, and a wet weight of 10-15 g.
In some embodiments, the step of preparing the slurry comprises:
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 40-60 wt% of fine grinding bamboo pulp, 40-60 wt% of OCC pulp and 0-5 wt% of broke recovery pulp;
preparing slurry at the bottom layer: 30-50 wt% of fine grinding bamboo pulp, 30-50 wt% of OCC pulp and 0-40 wt% of wood pulp.
In some embodiments, the stock approach ratio of the three-wire lap machine is: 15-30 wt% of surface layer: 30-35 wt% of core layer and 40-50 wt% of bottom layer.
In some embodiments, the unbleached sulfate softwood pulp has a freeness of 43-47 ° SR and a burst index of 6kpa 2 G, the folding resistance is more than or equal to 1700 times, the tear length is more than or equal to 6.5KM, the tensile index is more than or equal to 65N.m/g, and the tear strength is more than or equal to 6.0mN.m 2 /g。
The application also provides a high-grade craft paper, the high-grade craft paper is that the ration is 95-230g/m 2 The high-grade kraft liner board is prepared by any one of the methods.
Be different from prior art, above-mentioned technical scheme provides an advance craft paper that adopts bamboo thick liquids to prepare, has adopted bamboo thick liquids to replace partial import wood pulp and OCC thick liquids preparation advance craft paper, can solve advance craft paper production, the unstable problem of import wood pulp supply reduces the shutdown risk that the import raw materials shortage caused and the unstable problem of international market price thereof to effective control manufacturing cost, enterprise's production and operation risk reduces.
In some embodiments, the premium craft paper has a burst index of 3.9 to 4.2kpa 2 (g), folding endurance 300-.
The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, the present invention may be further implemented according to the content of the text of the specification, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description is given with reference to the detailed embodiments of the present application.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like, the following detailed description is given with reference to specific embodiments. The embodiments described herein are merely for more clearly illustrating the technical solutions of the present application, and therefore, the embodiments are only used as examples, and the scope of the present application is not limited thereby.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable solution as long as there is no technical contradiction or conflict.
Unless otherwise defined, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".
In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Without further limitation, in this application, the use of "including," "comprising," "having," or other similar expressions in phrases and expressions of "including," "comprising," or "having," is intended to cover a non-exclusive inclusion, and such expressions do not exclude the presence of additional elements in a process, method, or article that includes the recited elements, such that a process, method, or article that includes a list of elements may include not only those elements but also other elements not expressly listed or inherent to such process, method, or article.
As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.
The beating degree (beating degree) is referred to herein as beating degree. After the reaction slurry passes through a pulping machine, the fibers are cut off, split, swollen, hydrated and the like, and the effect of pulping is achieved. Pulping is to treat the fibers in the paper pulp by using a mechanical action method of grinding sheet and insection, so that the fibers are fluffed, properly cut and broomed; more importantly, the fibers absorb water and swell during pulping, so that the fibers have higher elasticity and plasticity, and meet the production requirements of a paper machine, so that the produced paper can reach the expected quality index.
Freeness represents the drainage performance of the pulp. The water quantity discharged from a side pipe of a Shore freeness instrument by using 2 g of absolute dry pulp, diluting the absolute dry pulp to 1000 ml and passing through an 80-mesh net at the temperature of 20 ℃ is the measured result. The beating degree is an index representing the property of the paper stock, and according to the beating degree of the paper stock, the future water filtration speed of the paper stock on a copper wire of a paper machine can be mastered, and the mechanical strength, tightness, manageability and the like of the paper produced in the future can be summarized and predicted, so that the mastering of the beating degree of the paper stock is an important technical control method in production.
The OCC-Old Corrugated Container described in this application is waste boxboard.
This application OCC production line production flow: OCC waste paper raw material-low-concentration hydraulic pulper-high-concentration slag separator-coarse screen-classifying screen-low-concentration heavy slag separator-fine screen-thermal dispersion-beating front pool-pulping machine-beating rear pool-pulp tower-paper feeder pulp preparation.
The application the wood pulp thread preparation process: wood pulp package-chain plate machine-low-concentration hydraulic pulper-discharge pump-high-concentration slag separator-discharge tank-before-beating tank-pulping machine-after-beating tank-paper feeder pulp preparation and paper making.
The application the broke recovered pulp is a semi-intermediate product produced in the production process of high-grade kraft liner paper, and is reused in pulp preparation after recovery and pulping. Wherein, the broke refers to wet broke and dry broke generated in the production process of the pulp on the wire. The wet broke refers to the net part edge cutting paper of the paper machine; the dry broke paper comprises mother roll rewinding edge cutting paper, mother roll residual roll bottom paper, waste paper generated by paper breaking and unqualified product rewinding paper. And (4) re-pulping the wet broke and the dry broke to obtain the broke recycled pulp which is used for recycling the blended pulp of the core layer and the bottom layer and is also called OCC pulp.
The application provides a preparation method of high-grade craft paper, which comprises the steps of pulping, pulp preparation, net part dehydration forming, press part squeezing, front drying part drying, sizing by a sizing machine and rear drying part drying;
wherein the pulping step comprises:
preparing refined pin wood pulp: the fine grinding pin wood pulp is obtained by adopting unbleached sulfate coniferous wood pulp and performing disintegration, high-concentration deslagging and disc grinding and pulping;
fine grinding bamboo pulp preparation: the fine grinding needle wood pulp adoptsCrushing the half-melted bamboo pulp, removing slag with high concentration, and pulping by a disc mill to obtain fine-ground bamboo pulp; the beating degree of the half-chemical bamboo pulp is 45 DEG SR, the tensile index is more than or equal to 40N.m/g, and the burst index is more than or equal to 2.5kpa.m 2 G, folding strength is more than or equal to 30 times, tearing strength is more than or equal to 10mN.m 2 The 16-mesh sieve passing rate is more than or equal to 70 percent;
preparing OCC slurry: preparing OCC short fiber pulp, OCC medium fiber pulp and OCC long fiber pulp by using domestic waste OCC; the slurry preparation step comprises:
surface layer slurry preparation: the fine grinding of the wood pulp is carried out,
core layer slurry preparation: OCC pulp, fine-grinding bamboo pulp and broke recovery pulp,
preparing slurry at the bottom layer: finely grinding the bamboo pulp, the wood pulp of the fine grinding needle and the OCC pulp;
the craft paper is made by a three-fold net paper machine.
Different from the prior art, the technical scheme provides the preparation method of the high-grade craft paper by adopting the bamboo pulp, the bamboo pulp is adopted to replace part of imported wood pulp and OCC pulp, the problem that the imported wood pulp is unstable in supply in the production of the high-grade craft paper can be solved, the shutdown risk caused by the shortage of imported raw materials and the problem that the international market price of the shutdown risk are unstable are reduced, the production cost is effectively controlled, and the production and operation risk of enterprises is reduced.
In some embodiments, the semi-chemical bamboo pulp is obtained by cooking bamboo chips with NaOH, and Na 2 SO 3 After sulfonation treatment, grinding and decomposing. In the prior art, after bamboo chips are pretreated by cooking with NaOH, the semi-chemical bamboo fiber pulp obtained by mechanical grinding has the coarse pulp yield of 83-87 percent and the burst index of the semi-chemical bamboo fiber pulp is generally 2.3-3.0kpa.m 2 G, folding endurance of 15-30 times.
In some embodiments, the semi-finished bamboo pulp has a degree of sulfonation of 1.5-2.2%. The sulfonation degree characterizes the sulfonic acid group content of sulfonated chemi-mechanical pulp and semi-chemical pulp, and the sulfonation degree is sulfonic acid group content multiplied by 81 multiplied by 10 -6 . The sulfonic group is a functional group, the sulfonic group is used as a nucleophilic reagent to introduce lignin to replace hydroxyl or ether groups, namely sulfonation of lignin, and hydrophobic natural lignin is converted into hydrophilic lignosulfonic acid, so that fibers can be moistened and expanded and can absorb moisture, and the higher the sulfonation degree is, the higher the fiber bonding performance is. The applicant is in the researchThe sulfonated and semi-processed bamboo pulp is found to be used for sheet making tests, and the burst index and the folding endurance are both improved. When the sulfonation degree of the semichemical bamboo pulp is 1.5-2.2%, the breaking resistance index of a sheet made of the semichemical bamboo fiber pulp (the beating degree of the sheet is 70-75 DEG SR in a sheet making test) is 3.0-3.2kpa 2 (g), folding endurance of 100-. And the sulfonated semi-chemical bamboo pulp is easier to pulp, and the pulping cost is also saved.
In some embodiments, the OCC long fiber pulp has a degree of beating 32-40 ° SR and a wet weight of 7.0-8.0g, the OCC medium fiber pulp has a degree of beating 35-45 ° SR and a wet weight of 5.0-7.0g, and the OCC short fiber pulp has a degree of beating 40-50 ° SR and a wet weight of 4.0-5.0 g. The beating degree shows the performance of OCC long, medium and short fiber pulp, and different water filtering speeds on a paper machine copper mesh in the later period, and the property of the craft paper is influenced.
In some embodiments, the refiner pin pulp and the refiner bamboo pulp have a refining concentration of 4.0-4.5%, a pulp beating degree of 25-45 ° SR, and a wet weight of 10-15 g. The beating degree is controlled to be 25-45 DEG SR, the water filtering speed is reasonable in the papermaking process, and the mechanical strength and tightness of the prepared high-grade craft paper meet the requirements.
In some embodiments, the slurry compounding step comprises:
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 40-60 wt% of fine grinding bamboo pulp, 40-60 wt% of OCC pulp and 0-5 wt% of broke recovery pulp;
preparing slurry at the bottom layer: 30-50 wt% of fine grinding bamboo pulp, 30-50 wt% of OCC pulp and 0-40 wt% of wood pulp.
In some embodiments, the three-wire machine has a stock ratio of: 15-30 wt% of surface layer: 30-35 wt% of core layer and 40-50 wt% of bottom layer. The pulp feeding proportion is mainly related to the thickness of the high-grade kraft paper, is related to both bursting resistance and folding endurance, and can be adjusted according to different rations and pulp preparation of the high-grade kraft paper.
In some embodiments, the unbleached sulfate softwood pulp has a freeness of 43-47 DEG SR and a burst index of 6kpa 2 G, the folding resistance is more than or equal to 1700 times, the tear length is more than or equal to 6.5KM, the tensile index is more than or equal to 65N.m/g, and the tear strength is more than or equal to 6.0mN.m 2 /g。
This application also providesProvides a high-grade kraft paper with the quantitative ratio of 95-230g/m 2 The high-grade kraft liner board is prepared by any one of the methods.
Be different from prior art, above-mentioned technical scheme provides an advance craft paper that adopts bamboo thick liquids to prepare, has adopted bamboo thick liquids to replace partial import wood pulp and OCC thick liquids preparation advance craft paper, can solve advance craft paper production, the unstable problem of import wood pulp supply reduces the shutdown risk that the import raw materials shortage caused and the unstable problem of international market price thereof to effective control manufacturing cost, enterprise's production and operation risk reduces.
In some embodiments, the premium craft paper has a burst index of 3.9 to 4.2kpa 2 (g), folding endurance 300-. The bursting resistance and the folding endurance are key technical indexes of the high-grade craft paper, the high-grade craft paper is graded according to the bursting resistance index and the folding endurance, and the prices of different grades are different.
Examples
In order to further clarify the explanation and explanation of the technical solutions of the present application, the following non-limiting examples are also provided for reference.
The unbleached sulfate softwood pulp in the embodiment has the beating degree of 43-47 DEG SR and the burst index of more than or equal to 6kpa 2 G, the folding resistance is more than or equal to 1700 times, the tear length is more than or equal to 6.5KM, the tensile index is more than or equal to 65N.m/g, and the tear strength is more than or equal to 6.0mN.m 2 /g。
The detection results of the qualified raw material unbleached sulfate softwood pulp are as follows:
in the embodiment, the high-grade craft paper is further subjected to calendaring and reeling after the papermaking.
Example 1 semi-finished bamboo pulp preparation:
in the prior art, after bamboo chips are pretreated by cooking with NaOH, the semi-chemical bamboo fiber pulp obtained by mechanical milling is obtained, the yield of coarse pulp is 83-87%, and the sheet making tests of different beating degreesThe bursting degree is 72 DEG SR, and the obtained semi-chemical bamboo fiber pulp has the burst index of 2.81kpa.m 2 G, folding endurance is 31 times; is higher than the domestic waste OCC slurry.
The beating test results of the semi-chemical bamboo fiber pulp obtained by mechanical milling after bamboo chips are pretreated by cooking with NaOH are shown in Table 1:
table 1: NaoH treated half-boiled bamboo pulp beating test results
The applicant further found in the study that bamboo chips were cooked with NaOH and then treated with Na 2 SO 3 The sulfonated semichemical bamboo pulp (degree of sulfonation is 1.5-2.2%) is used for sheet-making test, the bursting index and folding endurance are further improved, and the breaking index of the sheet-making prepared from the obtained semichemical bamboo fiber pulp (degree of beating 70-75 DEG SR in sheet-making test) is 3.0-3.2kpa.m 2 The folding endurance is 100-fold-resistant 120 times, is greatly higher than the domestic waste OCC pulp, and can partially replace imported needle blade pulp to be used for producing high-grade craft paper. And the sulfonated semi-chemical bamboo pulp is easier to pulp, and the pulping cost is also saved.
Table 2 shows the bamboo chips after being boiled with NaOH and then Na 2 SO 3 Beating test result of sulfonated semichemical bamboo pulp (sulfonation degree of 1.5-2.2%) with beating degree of 70 ° SR, and burst index of obtained semichemical bamboo fiber pulp of 3.20kpa.m 2 G, folding endurance of 100 times.
Table 2: NaoH treatment and sodium sulfite sulfonation hemimorphization bamboo pulp laboratory pulping test result
The halving adopted in the embodiments of the present applicationThe bamboo pulp is prepared by steaming bamboo chips with NaOH, and adding Na 2 SO 3 Sulfonation (the sulfonation degree is 1.5-2.2%) and grinding. The dryness of the half-processed bamboo pulp is 40-45%, and the 16-mesh sieve passing rate is more than or equal to 70%. When the beating degree of the semi-bamboo chemical pulp is 45 DEG SR, the tensile index is more than or equal to 40N.m/g, and the burst index is more than or equal to 2.5kpa.m 2 G, folding strength is more than or equal to 30 times, tearing strength is more than or equal to 10mN.m 2 /g。
Example 2OCC slurry preparation:
the flow of the OCC production line in the embodiment is as follows: 0CC waste paper raw material-low-concentration hydraulic pulper-high-concentration slag separator-coarse screen-classifying screen-low-concentration heavy slag separator-fine screen-thermal dispersion-beating front pool-pulping-beating back pool-pulp tower-paper feeder pulp mixing.
Feeding domestic waste OCC, crushing the pulping OCC, removing high-concentration slag, roughly screening, and then separating the screened (screen gap of 0.13-0.15mm) fraction into short fibers, medium fibers and long fibers; carrying out heavy deslagging, fine screening, thermal dispersion and pulping on the long fibers to obtain OCC long fiber pulp; carrying out heavy deslagging, fine screening, thermal dispersion and pulp grinding on the medium fiber to obtain OCC medium fiber pulp; the short fibers are subjected to heavy deslagging and fine screening (thermal dispersion and pulping are not needed) to obtain OCC short fiber pulp;
the content of OCC short fiber pulp in OCC pulp is 30-35 wt%, the content of fiber pulp in OCC is 28-32 wt%, and the content of OCC long fiber pulp is 30-35 wt%. The beating degree of OCC long fiber pulp is 32-40 degrees SR, the wet weight is 7.0-8.0g, the beating degree of OCC medium fiber pulp is 35-45 degrees SR, the wet weight is 5.0-7.0g, the beating degree of OCC short fiber pulp is 40-50 degrees SR, and the wet weight is 4.0-5.0 g.
Example 3 refiner pin pulp preparation
The wood pulp thread preparation process comprises the following steps: the method comprises the following steps of wood pulp packaging, a chain plate machine, a low-concentration hydraulic pulper, a discharge pump, a high-concentration slag separator, a discharge tank, a front beating tank, a pulping machine, a rear beating tank and a paper feeder.
Preparing refined pin wood pulp: the fine grinding pin wood pulp is obtained by adopting unbleached sulfate coniferous wood pulp and performing disintegration, high-concentration deslagging and disc grinding and pulping; the concentration of the refined needle wood pulp is 4.0-4.5%, the beating degree of finished pulp is 25-45 degrees SR, and the wet weight is 10-15 g.
EXAMPLE 4 Fine grinding needle bamboo pulp preparation
The preparation process of the bamboo pulp line comprises the following steps: the semi-chemical bamboo pulp-chain plate machine-low-concentration hydraulic pulper-discharge pump-high-concentration slag separator-discharge tank-before-beating tank-pulping machine-after-beating tank-paper feeder pulp-distributing and paper-making.
Preparing fine grinding bamboo pulp: the fine grinding bamboo pulp is prepared by adopting half-processed bamboo pulp and performing disintegration, high-concentration deslagging and disc grinding pulping; the grinding concentration of the fine grinding needle wood pulp and the fine grinding bamboo pulp is 4.0-4.5%, the beating degree of finished pulp is 25-45 degrees SR, and the wet weight is 10-15 g.
Example 5 quantitative determination is 95g/m 2 Preparation of high-grade craft paper
The high-grade craft paper is made by a three-ply net paper machine, which comprises: dewatering and forming a net part, squeezing a squeezing part, drying a front drying part, sizing by a sizing machine and drying a rear drying part;
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: fine grinding 60 wt% of bamboo pulp and 40 wt% of OCC pulp;
preparing slurry at the bottom layer: 10 wt% of fine grinding bamboo pulp, 50 wt% of OCC pulp and 40 wt% of fine grinding pin wood pulp.
The pulp feeding proportion is as follows: 15 wt% of surface layer: 35 wt% of core layer and 50 wt% of bottom layer
Example 6 quantification 160g/m 2 Preparation of high-grade craft paper
The high-grade craft paper is made by a three-ply net paper machine, which comprises: dewatering and forming a net part, squeezing a squeezing part, drying a front drying part, sizing by a sizing machine and drying a rear drying part;
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 40 wt% of fine grinding bamboo pulp and 60 wt% of OCC pulp;
preparing slurry at the bottom layer: 30 wt% of refined bamboo pulp, 30 wt% of OCC pulp and 40 wt% of refined needle wood pulp,
the pulp feeding proportion is as follows: 20 wt% of surface layer: 30 wt% of core layer and 50 wt% of bottom layer
Example 7 quantitation of 230g/m 2 Preparation of high-grade craft paper
The high-grade craft paper is manufactured by a three-fold net paper machine, which comprises the following steps: dewatering and forming a net part, squeezing a squeezing part, drying a front drying part, sizing by a sizing machine and drying a rear drying part;
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 35 wt% of fine grinding bamboo pulp, 60 wt% of OCC pulp and 5 wt% of broke recovery pulp;
preparing slurry at the bottom layer: 35 wt% of refined bamboo pulp, 35 wt% of OCC pulp and 30 wt% of refined needle wood pulp.
The pulp feeding proportion is as follows: 30 wt% of surface layer: 30 wt% of core layer and 40 wt% of bottom layer.
Example 8 quantitation of 160g/m 2 Preparation of high-grade craft paper
The high-grade craft paper is manufactured by a three-fold net paper machine, which comprises the following steps: dewatering and forming a net part, squeezing a squeezing part, drying a front drying part, sizing by a sizing machine and drying a rear drying part;
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 40 wt% of fine grinding bamboo pulp, 55 wt% of OCC pulp and 5 wt% of broke recovery pulp;
preparing slurry at the bottom layer: 50 wt% of refined bamboo pulp, 30 wt% of OCC pulp and 20 wt% of refined needle wood pulp.
The pulp feeding proportion is as follows: 25 wt% of surface layer: 30 wt% of core layer and 45 wt% of bottom layer.
The high-grade craft paper obtained in examples 5 to 8 has a bursting index of 3.9 to 4.2kpa 2 (g), folding endurance of 300-; other quality indexes are qualified.
OCC pulp, fine grinding needle wood pulp and fine grinding bamboo pulp are adopted in the preparation of the high-grade craft paper; surface layer slurry preparation: 100 wt% of fine refiner pin pulp; core layer slurry preparation: 40-60 wt% of fine grinding bamboo pulp, 40-60 wt% of OCC pulp and 0-5 wt% of broke recovery pulp; preparing slurry at the bottom layer: 30-50 wt% of refined bamboo pulp, 30-50 wt% of OCC pulp and 0-40 wt% of refined needle wood pulp. The pulp inlet proportion is controlled as follows: 15-30 wt% of surface layer: 30-35 wt% of core layer and 40-50 wt% of bottom layer.
Pulping feedstock of the above examples: 30-35% of domestic waste OCC, 25-35% of semi-chemical bamboo pulp and 30-45% of unbleached softwood pulp, and the bamboo pulp is adopted to replace part of OCC pulp and softwood pulp, so that the dosage of the softwood pulp can be reduced (50-150 kg/t); the direct production cost of raw materials, chemical auxiliary materials, power and the like is reduced by 150 plus 400 yuan/t paper.
Finally, it should be noted that, although the above embodiments have been described in the text of the specification of the present application, the scope of the patent protection of the present application is not limited thereby. All technical solutions which are generated by replacing or modifying the equivalent structure or the equivalent flow according to the content described in the specification of the present application based on the substantial idea of the present application, and which directly or indirectly implement the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of the present application.
Claims (10)
1. A preparation method of high-grade craft paper is characterized by comprising the steps of pulping, pulp preparation, net part dehydration forming, press part squeezing, front drying part drying, sizing by a sizing machine and rear drying part drying;
wherein the pulping step comprises:
preparing refined grinding wood pulp: the fine grinding pin wood pulp is obtained by adopting unbleached sulfate coniferous wood pulp and performing disintegration, high-concentration deslagging and disc grinding and pulping;
fine grinding bamboo pulp preparation: the fine grinding bamboo pulp is prepared by adopting half-processed bamboo pulp and performing disintegration, high-concentration deslagging and disc grinding pulping; the beating degree of the half-chemical bamboo pulp is 45 degrees SR, the tensile index is more than or equal to 40N.m/g, and the burst index is more than or equal to 2.5kpa.m 2 G, folding strength is more than or equal to 30 times, tearing strength is more than or equal to 10mN.m 2 The 16-mesh sieve passing rate is more than or equal to 70 percent;
preparing OCC slurry: preparing OCC short fiber pulp, OCC medium fiber pulp and OCC long fiber pulp by using domestic waste OCC; the slurry preparation step comprises:
surface layer slurry preparation: the fine grinding of the pin-point wood pulp,
core layer slurry preparation: OCC pulp, fine-grinding bamboo pulp and broke recovery pulp,
preparing slurry at the bottom layer: finely grinding the bamboo pulp, the wood pulp of the fine grinding needle and the OCC pulp;
the craft paper is made by a three-fold net paper machine.
2. The method as claimed in claim 1, wherein the semi-chemical bamboo pulp is prepared by cooking bamboo chips with NaOH, and adding Na 2 SO 3 After sulfonation treatment, grinding and decomposing.
3. The method as claimed in claim 2, wherein the semi-chemical bamboo pulp has a sulfonation degree of 1.5-2.2%.
4. The preparation method according to claim 1, wherein the OCC long fiber pulp has a beating degree of 32-40 ° SR and a wet weight of 7.0-8.0g, the OCC medium fiber pulp has a beating degree of 35-45 ° SR and a wet weight of 5.0-7.0g, and the OCC short fiber pulp has a beating degree of 40-50 ° SR and a wet weight of 4.0-5.0 g.
5. The method of claim 1, wherein the refiner consistency of the refiner pin pulp and the refiner bamboo pulp is 4.0-4.5%, the beating degree of the finished pulp is 25-45 ° SR, and the wet weight is 10-15 g.
6. The method of claim 1, wherein the step of preparing the slurry comprises:
surface layer slurry preparation: 100 wt% of fine refiner pin pulp;
core layer slurry preparation: 40-60 wt% of fine grinding bamboo pulp, 40-60 wt% of OCC pulp and 0-5 wt% of broke recovery pulp;
preparing slurry at the bottom layer: 30-50 wt% of refined bamboo pulp, 30-50 wt% of OCC pulp and 0-40 wt% of refined needle wood pulp.
7. The method according to claim 1, characterized in that the stock feeding ratio of the triple-lap machine is: 15-30 wt% of surface layer: 30-35 wt% of core layer and 40-50 wt% of bottom layer.
8. The method of claim 1, wherein the unbleached sulfate softwood pulp has a freeness of 43-47 ° SR and a burst index of 6kpa.m or more 2 G, the folding resistance is more than or equal to 1700 times, the tear length is more than or equal to 6.5KM, the tensile index is more than or equal to 65N.m/g, and the tear strength is more than or equal to 6.0mN.m 2 /g。
9. The high-grade craft paper is characterized in that the quantitative ratio of the high-grade craft paper is 95-230g/m 2 Of high-grade craft paper, theHigh-grade kraft paper produced by the process of any one of claims 1 to 8.
10. A premium craft paper according to claim 9 wherein the bursting index of the premium craft paper is from 3.9 to 4.2kpa 2 (g), folding endurance 300-.
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