CN115506181A - White release base paper and manufacturing method thereof - Google Patents
White release base paper and manufacturing method thereof Download PDFInfo
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- CN115506181A CN115506181A CN202211245621.7A CN202211245621A CN115506181A CN 115506181 A CN115506181 A CN 115506181A CN 202211245621 A CN202211245621 A CN 202211245621A CN 115506181 A CN115506181 A CN 115506181A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000004513 sizing Methods 0.000 claims abstract description 43
- 102000004190 Enzymes Human genes 0.000 claims abstract description 39
- 108090000790 Enzymes Proteins 0.000 claims abstract description 39
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 31
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 25
- 238000004537 pulping Methods 0.000 claims abstract description 23
- 239000011121 hardwood Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000011122 softwood Substances 0.000 claims abstract description 16
- 235000011194 food seasoning agent Nutrition 0.000 claims abstract description 12
- 238000005498 polishing Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 230000018044 dehydration Effects 0.000 claims abstract description 8
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000123 paper Substances 0.000 claims description 141
- 229940088598 enzyme Drugs 0.000 claims description 38
- 238000010009 beating Methods 0.000 claims description 25
- 229940059442 hemicellulase Drugs 0.000 claims description 13
- 108010084185 Cellulases Proteins 0.000 claims description 10
- 102000005575 Cellulases Human genes 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 9
- 244000007835 Cyamopsis tetragonoloba Species 0.000 claims description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- -1 hydroxypropyl Chemical group 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- 238000007872 degassing Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 2
- 239000002655 kraft paper Substances 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 abstract description 13
- 239000010703 silicon Substances 0.000 abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 12
- 239000007888 film coating Substances 0.000 abstract description 11
- 238000009501 film coating Methods 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 18
- 229920002678 cellulose Polymers 0.000 description 12
- 239000001913 cellulose Substances 0.000 description 12
- 230000032798 delamination Effects 0.000 description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 description 9
- 238000003490 calendering Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000011049 filling Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012805 post-processing Methods 0.000 description 5
- 229920002488 Hemicellulose Polymers 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 108010059892 Cellulase Proteins 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 229940106157 cellulase Drugs 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- HEBKCHPVOIAQTA-NGQZWQHPSA-N d-xylitol Chemical compound OC[C@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-NGQZWQHPSA-N 0.000 description 2
- 239000000665 guar gum Substances 0.000 description 2
- 229960002154 guar gum Drugs 0.000 description 2
- 235000010417 guar gum Nutrition 0.000 description 2
- 108010002430 hemicellulase Proteins 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229920001221 xylan Polymers 0.000 description 2
- 150000004823 xylans Chemical class 0.000 description 2
- OMDQUFIYNPYJFM-XKDAHURESA-N (2r,3r,4s,5r,6s)-2-(hydroxymethyl)-6-[[(2r,3s,4r,5s,6r)-4,5,6-trihydroxy-3-[(2s,3s,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1OC[C@@H]1[C@@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)O)[C@H](O)[C@H](O)[C@H](O)O1 OMDQUFIYNPYJFM-XKDAHURESA-N 0.000 description 1
- GUBGYTABKSRVRQ-CUHNMECISA-N D-Cellobiose Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-CUHNMECISA-N 0.000 description 1
- 101100256850 Drosophila melanogaster EndoA gene Proteins 0.000 description 1
- 102000004533 Endonucleases Human genes 0.000 description 1
- 108010042407 Endonucleases Proteins 0.000 description 1
- 108060002716 Exonuclease Proteins 0.000 description 1
- 229920000926 Galactomannan Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229940079919 digestives enzyme preparation Drugs 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 102000013165 exonuclease Human genes 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
- 125000000969 xylosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)CO1)* 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/005—Microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of papermaking, and provides white release base paper and a manufacturing method thereof, wherein the method comprises the following steps: according to the weight percentage of 5-15%: the raw paper is prepared by mixing 85-95% of pulp, taking bleached sulfate softwood chemical pulp and bleached sulfate hardwood chemical pulp as fiber raw materials, and sequentially carrying out seasoning, impurity removal, sizing, net part dehydration forming, squeezing, front drying, surface sizing, rear drying and press polishing on a raw paper product; the bleached sulfate hardwood chemical pulp is pulped with the aid of a complex enzyme, so that the pulping degree is controlled to be 42-46SR; the sizing slurry adopts more than 1.5kg/t of nonionic hydroxypropyl guar gum. The white release base paper product prepared by the invention has excellent paper surface fineness, good layering force, good uniformity and excellent film coating and silicon coating processability.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to high-grade white release base paper and a manufacturing method thereof.
Background
The release paper is anti-sticking paper which can prevent the adhesion of the prepreg and can also protect the prepreg from being polluted. The release paper is made by compounding an anti-sticking substance on base paper or body paper, and the types of the release paper are distinguished according to differences of materials, thickness, elongation, single and double sides and the like. Wherein the gram weight varies from 35 to 250 grams per square meter. In terms of color, the release paper mainly comprises white release paper and yellow (blue) release paper. The white single-silicon release paper is plain paper on one side and silicone oil on the other side; the white release base paper needs to be processed by film coating, silicon coating and the like at the later stage.
In China, white release base paper is mainly classified into four grades. The first grade is base paper which is mainly subjected to double-sided film coating in the later stage and is used for manufacturing adhesive tapes and the like; the second grade is mainly used for reflecting materials, car body stickers, mobile phone films and the like; the third grade is mainly used for cold laminating films; the fourth grade is mainly used for non-setting adhesive products. Wherein, the post-processing of the first and second grade release base paper comprises double-sided film coating, double-sided silicon coating, single-sided film coating, single-sided silicon coating and the like, and the product ration is generally 80 to 120g/m 2 . The papermaking product has large domestic consumption, good paper layering force, excellent film coating and other processing performances, but the paper surface fineness is required to be further improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide high-grade white release base paper and a manufacturing method thereof.
The invention provides a method for manufacturing white release base paper, which comprises the following steps: according to the weight percentage of 5-15%: 85-95% of pulp proportioning, taking bleached sulfate softwood chemical pulp and bleached sulfate hardwood chemical pulp as fiber raw materials to carry out pulp proportioning, and sequentially carrying out seasoning, impurity removal, sizing, net part dehydration forming, squeezing, front drying, surface sizing, rear drying and press polishing on a raw paper product to obtain the finished product;
the bleached sulfate hardwood chemical pulp is pulped with the aid of a complex enzyme, so that the pulping degree is controlled to be 42-46SR; the sizing slurry adopts more than 1.5kg/t of nonionic hydroxypropyl guar gum.
In the embodiment of the application, the complex enzyme mainly comprises endo-cellulase, exo-cellulase, endo-hemicellulase and exo-hemicellulase.
In the embodiment of the application, the dosage of the compound enzyme for auxiliary pulping is 0.3-0.5kg/t pulp.
In the examples of the present application, the beating degree of the bleached sulfate softwood chemical pulp is controlled to be 48-52SR.
In the examples of the present application, 2-5kg/t paper of non-ionic hydroxypropyl guar was used in the sizing.
In the examples of the present application, the surface sizing is added with 1-5kg/t of sodium carboxymethyl cellulose of the paper.
In the embodiment of the application, the base paper product is formed by sequentially carrying out thick liquid screening, seasoning, pulp washing, desanding and degassing, sizing, paper machine screening, pulp flowing, net part dehydration forming, pressing, front drying, surface sizing, rear drying and calendaring.
In the embodiment of the application, the mass concentration after slurry preparation is 3.0-3.5%; the concentration of the pulp during the pulp flushing is 0.85-0.95%.
The invention provides the white release base paper obtained by the manufacturing method, and the product ration is 80-120g/m 2 The roughness is within 3 microns.
In the embodiment of the application, the smoothness of the white release base paper is more than or equal to 80s, and the fracture length is more than or equal to 7000m; transverse tear of 300mN or more, sheet delamination force of 1.3N/25mm or more, whiteness of 84-86% ISO.
The pulp prepared from the white release base paper is bleached sulfate softwood chemical pulp (NBKP) and bleached sulfate hardwood chemical pulp (LBKP), and the pulp comprises the following components in parts by weight: NBKP 5-15%; LBKP 85-95%; the base paper product is prepared by sequentially carrying out seasoning, impurity removal, sizing, net part dehydration forming, squeezing, front drying, surface sizing, rear drying and press polishing. Wherein, the broadleaf wood chemical pulp LBKP is obtained by adopting compound enzyme auxiliary pulping, and the pulping degree is 42-46SR; and the sizing slurry adopts more than 1.5kg/t of nonionic hydroxypropyl guar gum. The high-grade paper product only uses a small amount of the softwood chemical pulp, and is mainly produced by using finer hardwood chemical pulp fibers, so that excellent paper surface fineness, better evenness and the like can be obtained. As less softwood chemical pulp is adopted, and in order to ensure the paper layering force of more than 1.3N/(25 mm) and meet the requirement on the layering force when the paper is used as an adhesive tape, the invention can add more than 1.5kg/t of nonionic hydroxypropyl guar gum before a paper machine sieve. The invention can make the paper lamination force meet the application requirement under the condition of low long fiber slurry (NBKP) proportion, and ensure the excellent stripping performance of the post-processing manufactured adhesive tape.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
The invention provides a method for manufacturing white release base paper, which comprises the following steps:
bleached sulfate softwood chemical pulp and bleached sulfate hardwood chemical pulp (the beating degree is controlled to be 42-46SR by adopting compound enzyme for auxiliary beating) are used as fiber raw materials, and the weight percentage is 5-15%: mixing 85-95% of pulp, sequentially performing seasoning, impurity removal and sizing, wherein the pulp is prepared from more than 1.5kg/t of paper nonionic hydroxypropyl guar gum; and then, carrying out net part dehydration forming, squeezing, front drying, surface sizing, rear drying and press polishing to obtain a white release base paper product.
The white release base paper prepared by the process meets the requirements of excellent fineness, good production and operation performance, good paper layering force, good paper surface cleanliness, uniformity and the like of paper, and is beneficial to post-processing application.
In the invention, the fiber pulp is bleached sulfate softwood chemical pulp (NBKP) and bleached sulfate hardwood chemical pulp (LBKP), and the fiber pulp specifically comprises the following components in parts by weight: 5 to 15% of NBKP;85 to 95% of LBKP. The bleached sulfate softwood pulp with the English abbreviation NBKP is a chemical pulp prepared by taking softwood as a raw material and adopting a sulfate method for cooking and bleaching, and has wide application; LBKP is made from hardwood, which is shorter in fiber. The embodiment of the invention mainly produces the hardwood chemical pulp LBKP with finer fibers, and uses a small amount of the softwood chemical pulp, thereby being beneficial to meeting the requirement of higher paper surface fineness and effectively improving the paper evenness and the like. The fiber pulp in the embodiment of the invention can be obtained by adopting the market and can also be prepared.
In order to further reduce the roughness of the paper surface, improve the strength of the paper and improve the evenness of the paper, the embodiment of the invention adopts compound enzyme to assist the hardwood chemical pulp (LBKP) for pulping, and the pulping degree is 42-46SR. The fibers are swelled and cut off through pulping, and the surface is fibrillated, so that the pulp has certain papermaking performance; the degree of beating (also called the degree of beating) reflects the difficulty of the slurry dehydration, and the higher the degree of beating, the more difficult the slurry dehydration. In addition to the mechanical shearing action, the beating of LBKP in the embodiment of the invention is assisted by complex enzyme (compounding of various enzyme preparations).
In the application of pulping enzymes, because the specificity of an enzyme preparation is very strong, the raw materials aimed at by one enzyme are single, and the method adopts the complex enzyme to assist the hardwood pulp fiber for pulping, so that the limitation of a single enzyme variety can be overcome, and the pulping effect of the fiber can be effectively improved. Specifically, the main components of the complex enzyme are endo-cellulase, exo-cellulase and endo-hemicellulase and exo-hemicellulase. 70-80% of cellulase in the complex enzyme by mass, wherein 25-35% of cellulose exonuclease and 35-45% of cellulose endonuclease; 20-30% of hemicellulase, 5-10% of hemicellulose exoenzyme and 10-25% of cellulose endo enzyme. And the enzyme preparation has an overall activity of 2500u/g or more.
In the embodiment of the invention, the beating principle assisted by endo-cellulase and exo-cellulase comprises the following steps: the hardwood chemical pulp mainly comprises cellulose, and endo-cellulase in the compound enzyme acts on an amorphous area of a cellulose molecule and can randomly degrade glycosidic bonds in the cellulose molecule to cut off long-chain cellulose molecules to generate a large number of small cellulose molecules with non-reducing end groups. Exo-cellulase acts on the ends of cellulose linear molecules and cleaves glycosidic bonds from the reducing or non-reducing ends of the cellulose molecules to produce cellobiose. And (3) degrading cellulose, and completing auxiliary pulping of the broad-leaved wood cellulose by virtue of the synergistic effect of multiple components.
And the auxiliary pulping principle of the endo-hemicellulase and the exo-hemicellulase comprises the following steps: the hardwood chemical pulp contains a large amount of hemicellulose, wherein endo-hemicellulase acts on xyloside bonds in a main chain of hemicellulose xylan, and main hydrolysis products of the endo-hemicellulase are xylo-oligosaccharide and a small amount of xylose. Exo-hemicellulase acts on the non-reducing ends of hemicellulose xylan and xylo-oligosaccharide, and the product is xylose.
According to the embodiment of the invention, the complex enzyme is used for assisting the LBKP pulping, thereby strengthening the devillicate fibrillation and cutting-off of the broadleaf wood fiber and effectively improving the fineness and the evenness of subsequent paper. Preferably, the pulping concentration is controlled to be 2-5%, the temperature is 30-50 ℃, and the pulping pH value is 7.0-8.8; too high or too low temperature and pH value have a great influence on the use effect of the enzyme. In the embodiment of the invention, the following is the experimental content of improving the pulping effect of the sulfate hardwood chemical pulp (LBKP) by adopting the compound enzyme:
table 1 physical index detection of Complex enzyme-assisted LBKP beating in some examples
A1 # to 4# enzyme preparation group (the enzyme dosage in pulping is 0.1,0.2,0.3,0.4kg/t pulp) and a blank group are respectively arranged in a laboratory, and are calendered according to the same conditions after sheet making, and then the quantification, the fracture length, the tearing index, the roughness and the delamination force are detected, as shown in Table 1. It should be noted that, in this experiment, calcium carbonate was not added as a filler, and ash content was less than 1%. In the actual production, because calcium carbonate is added in the seasoning process, the ash content of paper is controlled to be 18-20%, and the layering rate of the paper is lower than the experimental result.
In combination with the above research of the application, preferably, when the using amount of the complex enzyme is controlled to be 0.3-0.5kg/t pulp, the roughness can be controlled to be less than 3 mu m, and the layering force is obviously improved compared with that of the method without using the complex enzyme. In the preferred embodiment of the invention, the LBKP adopts complex enzyme for auxiliary pulping, the dosage can be 0.3-0.5kg/t pulp, and the pulping degree is controlled at 42-46SR.
Further, in the embodiment of the invention, in order to improve the wet-end drainage performance and the strength of the paper in the production of the paper, the NBKP beating degree is preferably controlled to be 48-52SR. The applicant determines the control range of the beating degree through innovative experimental research, and the following are experimental results and analysis:
TABLE 2 influence of NBKP freeness on delamination force and drainage Rate in some examples
| Beating degree SR | Lamination force N/(25 mm) | Water filtration speed L/s (liter/second) |
| 30 | 3.52 | 9.6 |
| 42 | 3.61 | 7.3 |
| 48 | 4.22 | 6.9 |
| 52 | 4.78 | 6.4 |
| 56 | 4.79 | 5.3 |
| 61 | 4.81 | 4.2 |
Description of the drawings: in the experiment, calcium carbonate is not added as a filler, and the ash content is lower than 1%. In the actual production, because calcium carbonate is added in the seasoning process, the ash content of paper is controlled to be 18-20%, and the layering rate of the paper is lower than the experimental result.
The above experiments mainly investigate the influence of the beating degree on the NBKP layering force and the water filtering speed, wherein the water filtering speed mainly inspects the water filtering performance of the paper material on the net part of the paper machine, the speed is too high, the paper forming is not good, the evenness is poor, and the speed is too low, the net part water filtering is too slow, the problems of paper breaking of a wet part and high energy consumption of a drying part are easy to occur in papermaking. From the experimental data, when NBKP freeness was between 48SR to 52SR, the delamination force was at a higher level, while the drainage rate was moderate. If the freeness is 52SR and above, the layering force is not increased greatly, but the drainage speed is decreased greatly.
The embodiment of the invention adopts NBKP and LBKP in the weight ratio of the slurry to prepare the slurry, the slurry is mixed and prepared into mixed slurry with the mass concentration of the slurry of 3.0-3.5 percent, the mixed slurry is screened, seasoned and washed by thick slurry, the concentration can be controlled at 0.85-0.95 percent, and then sand removal, degassing and sizing are carried out.
In the embodiment of the invention, 1.5kg/t or more of nonionic hydroxypropyl guar gum is added before a paper machine screen, and 2-5kg/t of paper is preferred. Guar Gum (GG) is a natural galactomannan, hydroxypropyl guar (HPG) is a modified substance to hydroxypropylate GG. In a specific example, the hydroxypropyl guar viscosity is 2000-4000mpa.S (1 wt% aqueous solution).
Compared with the traditional starch as the in-pulp reinforcing agent, the non-ionic hydroxypropyl guar gum is added, and straight chain molecules of the non-ionic hydroxypropyl guar gum can provide more hydrogen bond binding points, so that the non-ionic hydroxypropyl guar gum has a better paper strength reinforcing effect, so that the paper layering force can reach more than 1.3N/(25 mm) under the condition of a low-long fiber size (NBKP) proportion, the excellent stripping performance of an after-processing manufactured adhesive tape is ensured, and the cost is saved.
Illustratively, the following test results and analysis of the effect of nonionic hydroxypropyl guar on paper delamination strength were carried out using a slurry blend of NBK10% and LBKP90%, wherein NBKP freeness 51sr, LBKP freeness 44SR, and ash content was controlled at 18.5-19.0%.
Table 3 results of experiments on the effect of non-ionic hydroxypropyl guar on paper delamination force in some examples
The experiment results show that when the ash content of the paper is 18.5-19.0%, the paper layering force can be obviously improved by adding the hydroxypropyl guar gum in the embodiment of the invention, and when the using amount reaches 2.0 kg/ton of paper, the layering force can reach more than 1.30N/(25 mm). The embodiment of the invention further combines the layering force and the production cost factors, and the dosage of the hydroxypropyl guar gum is controlled to be more suitable to be 2-5 kg/ton of paper.
The white release base paper is prepared by the steps of paper machine screening, a head box, net dewatering and forming, squeezing, front drying, surface sizing, rear drying, press polishing and the like. The papermaking wet part comprises a net part and a pressing part, wherein the main equipment of the net part comprises a forming net, a head box and the like, and the main equipment of the pressing part is a pressing roll. In the wet end process of a paper machine, the influence of the addition of chemicals such as sizing agents and fillers on the properties of the paper is of great importance.
In the examples of the invention, the wire section is dewatered, formed, pressed, dried, etc. as usual processes. The paper filling adopts light calcium carbonate, the filling amount is 16-22%, and the adding point is before a paper machine sieve. The usage amount of the commonly used retention aid polyacrylamide is 0.2-0.5kg/t of paper, and the addition point is behind a paper machine sieve. The squeezing adopts two shoe squeezing, the pressure of a press area is controlled to be 600-900KN/m, a front drying cylinder is divided into three sections of ventilation, and the control range of the cylinder surface temperature is as follows: the first section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; after-drying (after surface sizing), introducing steam in two sections, except the last two cold cylinders, controlling the cylinder surface temperature within the range of 80-115 ℃, and controlling the cylinder surface temperature of the last two cylinders to be 30-50 ℃ (reducing the cylinder temperature by introducing cold water); certain surface properties can be imparted to the paper by surface sizing; the calendering process is a process before reeling in the paper manufacturing process and mainly improves the surface smoothness of paper.
In order to further improve the surface smoothness and the surface strength of the paper, 1 to 5kg/t of sodium carboxymethyl cellulose (CMC) of the paper is preferably added in the surface sizing of the embodiment of the invention. The concrete embodiment of the invention also adds calcium carbonate as a filler, which can fill the gaps among fibers and improve the smoothness of paper and the like.
According to the embodiment of the invention, a white release base paper product is obtained by coiling and packaging; the embodiment of the invention provides the white release base paper, and the product ration is 80-120g/m 2 The roughness is within 3 microns. The product has excellent paper surface fineness, can be used for mobile phone film or vehicle body advertisement sticker, and has low paper surface roughness and roughness controlWithin 3 microns (the roughness of common release base paper is more than 4 microns) so as to prevent air bubbles from being generated when mobile phone films and vehicle body advertisements are pasted.
The main parameters of the product prepared by the embodiment of the invention are as follows: quantitative 80-120g/m 2 The roughness is less than or equal to 3 mu m, the smoothness is more than or equal to 80s, and the fracture length is more than or equal to 7000m; transverse tear of 300mN or more, sheet delamination strength of 1.3N/(25 mm), whiteness of 84-86% ISO.
The embodiment of the invention mainly adopts the following technologies: (1) The pulp proportioning is mainly LBKP, and the fineness and the evenness of paper can be effectively improved; (2) In order to effectively improve the fineness, the uniformity and the layering force of paper, the NBKP beating degree is controlled to be 48-52SR, and the LBKP beating degree is controlled to be 42-46SR, wherein the LBKP adopts compound enzyme for auxiliary beating to improve the fineness, reduce the roughness and improve the uniformity of the paper. (3) 2-5kg/t of nonionic hydroxypropyl guar gum is preferably adopted in the pulp, and the pulp has a better paper strength enhancing effect, so that the paper layering force can reach more than 1.3N/25mm under the condition of low long fiber pulp (NBKP) proportion, the excellent stripping performance of the post-processing manufactured adhesive tape is ensured, and the cost is saved; (4) In the surface sizing process, 1-5kg/t of paper sodium carboxymethyl cellulose (CMC) is added, so that the surface fineness and the surface strength of the paper are further improved. The embodiment of the invention researches and develops the high-grade release base paper, and has great significance for improving the product grade of enterprises, improving the profitability and improving the image of the enterprises.
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention. Unless otherwise specified, the mass ratio is used in the present invention.
The complex enzyme related to the following examples is commercially available, the main components are cellulase and hemicellulase, and the total enzyme activity is not less than 2500u/g. The hydroxypropyl guar viscosity was 2000-4000mpa.S (1% aqueous solution).
Example 1
The beating degree of the bleached sulfate softwood chemical pulp (NBKP) is controlled at 49SR, and the beating degree of the bleached sulfate hardwood chemical pulp (LBKP) is controlled at 43SR; the pulping of LBKP is assisted by complex enzyme, and the using amount of the complex enzyme is 0.3kg/t pulp.
Mixing the pulp according to the weight ratio of NBKP 15% and LBKP 85%, mixing the pulp to 3.0% concentration, passing through thick pulp screen, seasoning, flushing pulp, controlling the concentration at 0.9%, desanding, degassing, sizing, adding 3kg/t paper nonionic hydroxypropyl guar gum before paper machine screen, passing through paper machine screen, head box, net dewatering and forming, squeezing, pre-drying, surface sizing, post-drying, press polishing, finally coiling and packaging to obtain white release base paper.
Wherein, the used wet end chemicals specifically include: light calcium carbonate with 18% filling amount is added before the paper machine sieve. The usage amount of the retention aid polyacrylamide is 0.3kg/t of paper, and the addition point is behind a paper machine sieve.
The squeezing adopts two shoe squeezing, the pressure of a press area is respectively controlled at 700 KN/m and 800KN/m, the front drying cylinder is divided into three sections of ventilation cylinders, and the control range of the cylinder surface temperature is as follows: the first section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; the post-drying is divided into two sections to be aerated, the temperature of the cylinder surface is controlled within the range of 80-115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled within the range of 30-50 ℃; in the surface sizing, 2kg/t of sodium carboxymethyl cellulose of paper is added, the concentration of the sizing material for surface sizing is 18 percent, the viscosity is 15mPa.S, single-nip soft calendering is adopted for calendering, the pressure is 120KN/m, and the temperature of a hot roll is 140 ℃.
By the measurement: quantitative determination 80g/m 2 Roughness of 2.5 microns, smoothness of 88s and fracture length of 8250m; transverse tear 325mN, paper delamination strength 1.45N/(25 mm), whiteness 85.8% ISO.
The paper surface has good evenness and uniform thickness, and has excellent processing performance of film coating and silicon coating. In order to ensure the film coating and silicon coating performances, the transverse quantitative deviation of the detected paper web is less than 1.5g/m 2 Actually measured, 1.0g/m 2 . The lateral thickness deviation was less than 2.5 microns, with 1.5 microns being observed. The peeling force after the silicon on the film was sprayed was less than 0.2N/(25 mm), and the average value was found to be 0.14N/(25 mm).
Example 2
The beating degree of bleached sulfate softwood chemical pulp (NBKP) is controlled at 50SR, the beating degree of bleached sulfate hardwood chemical pulp (LBKP) is controlled at 44SR, beating of LBKP is assisted by complex enzyme, and the using amount of the complex enzyme is 0.4kg/t pulp.
Mixing the pulp according to the weight ratio of NBKP 10% and LBKP90%, mixing the pulp to 3.2%, passing through thick pulp screen, seasoning, flushing pulp, controlling the concentration at 0.95%, desanding, degassing, sizing, adding 4kg/t paper nonionic hydroxypropyl guar gum before paper machine screen, passing through paper machine screen, head box, net dewatering, pressing, pre-drying, surface sizing, post-drying, press polishing, finally coiling and packaging to obtain white release base paper.
Wherein, the used wet end chemicals specifically include: the filling amount of the light calcium carbonate is 19 percent, and the adding point is before a paper machine sieve. The usage amount of the retention aid polyacrylamide is 0.35kg/t of paper, and the addition point is behind a paper machine sieve.
The squeezing adopts two shoe squeezing, the pressure of a press area is respectively controlled at 750 KN/m and 850KN/m, a front drying cylinder is divided into three sections of ventilation, and the control range of the cylinder surface temperature is as follows: the temperature of the first section is 40-80 ℃, the temperature of the second section is 80-105 ℃, and the temperature of the third section is 90-115 ℃; the post-drying is divided into two sections to be aerated, the temperature of the cylinder surface is controlled within the range of 80-115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled within the range of 30-50 ℃; in the surface sizing, 3kg/t of sodium carboxymethyl cellulose of paper is added, the concentration of the sizing material for surface sizing is 15%, the viscosity is 12mPa.S, single-nip soft calendering is adopted, wherein the pressure is 125KN/m, and the temperature of a hot roll is 128 ℃.
By the measurement: quantitative determination of 100g/m 2 Roughness 2.3 μm, smoothness 83s, and fracture length 7100m; transverse tear of 378mN, paper delamination strength of 1.55N/(25 mm), whiteness of 84.8% ISO.
In order to ensure the performances of film coating and silicon coating, the transverse quantitative deviation of the detected paper web is less than 1.5g/m 2 Actually measured, 1.2g/m 2 . The lateral thickness deviation was less than 2.5 microns, with 1.8 microns being measured. The peeling force after the silicon on the film was sprayed was less than 0.2N/(25 mm), and the average value was found to be 0.12N/(25 mm).
Example 3
The beating degree of bleached sulfate softwood chemical pulp (NBKP) is controlled at 51SR, the beating degree of bleached sulfate hardwood chemical pulp (LBKP) is controlled at 45SR, beating of LBKP is assisted by complex enzyme, and the using amount of the complex enzyme is 0.5kg/t pulp.
Mixing the pulp according to the weight ratio of NBKP 5% and LBKP95%, mixing the pulp to 3.2% concentration, passing through thick pulp screen, seasoning, flushing, controlling the concentration at 0.92%, desanding, degassing, sizing, adding 4.5kg/t paper non-ionic hydroxypropyl guar gum before paper machine screen, passing through paper machine screen, head box, net dewatering, pressing, pre-drying, surface sizing, post-drying, press polishing, finally winding and packaging to obtain white release base paper.
Wherein, the wet end chemicals used specifically include: the filling amount of the light calcium carbonate is 17 percent, and the adding point is before a paper machine sieve. The usage amount of the retention aid polyacrylamide is 0.4kg/t of paper, and the addition point is behind a paper machine sieve.
The press adopts two shoe presses, the nip pressure is respectively controlled at 690, 830KN/m, the front drying cylinder is divided into three-segment steam, the cylinder surface temperature control range is: the first section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; the post-drying is divided into two sections to be aerated, the temperature of the cylinder surface is controlled within the range of 80-115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled within the range of 30-50 ℃; in the surface sizing, 4kg/t of sodium carboxymethylcellulose of paper is added, the surface sizing concentration is 16%, and the viscosity is 11mPa.S, single-nip soft calendering is adopted, wherein the pressure is 118KN/m, and the temperature of a hot roll is 135 ℃.
By the measurement: quantitative determination of 120g/m 2 Roughness 2.1 μm, smoothness 86s, and fracture length 7050m; transverse tear 432mN, paper delamination strength 1.45N/(25 mm), whiteness 85.2% ISO.
In order to ensure the performances of film coating and silicon coating, the transverse quantitative deviation of the detected paper web is less than 1.5g/m 2 Actually measured, 1.0g/m 2 . The lateral thickness variation was less than 2.5 microns, with 1.3 microns being observed. The peeling force after the silicon on the film was sprayed was less than 0.2N/(25 mm), and the average value was found to be 0.13N/(25 mm).
From the above embodiments, the high-grade white release base paper prepared by the method of the invention has excellent paper surface fineness and good layering force, the paper surface is clean, uniform in thickness and good in uniformity, and the high-grade white release base paper has excellent performance in post-processing applications such as film coating and silicon coating and has wide prospects.
The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (10)
1. The manufacturing method of the white release base paper is characterized by comprising the following steps:
according to the weight percentage of 5-15%: the raw paper is prepared by mixing 85-95% of pulp, taking bleached sulfate softwood chemical pulp and bleached sulfate hardwood chemical pulp as fiber raw materials, and sequentially carrying out seasoning, impurity removal, sizing, net part dehydration forming, squeezing, front drying, surface sizing, rear drying and press polishing on a raw paper product;
the bleached sulfate hardwood chemical pulp is pulped with the aid of a complex enzyme, so that the pulping degree is controlled to be 42-46SR; and the sizing slurry adopts more than 1.5kg/t of nonionic hydroxypropyl guar gum.
2. The process according to claim 1, wherein the complex enzyme comprises, as essential components, an endo-cellulase, an exo-cellulase, an endo-hemicellulase and an exo-hemicellulase.
3. The preparation method of claim 2, wherein the amount of the complex enzyme for auxiliary pulping is 0.3-0.5kg/t pulp.
4. The method of manufacturing according to claim 1, wherein the beating degree of the bleached kraft softwood chemical pulp is controlled at 48-52SR.
5. The method of manufacturing according to claim 1, wherein 2-5kg/t paper of non-ionic hydroxypropyl guar is used in the sizing slurry.
6. The method of manufacturing according to claim 5, characterized in that 1-5kg/t of sodium carboxymethyl cellulose of the paper is added to the surface sizing.
7. The manufacturing method according to any one of claims 1 to 6, characterized in that the base paper product is formed by sequentially passing through a thick stock screen, a seasoning, a pulp washing, desanding and degassing, a sizing, a paper machine screen, a pulp flowing, a wire dewatering and forming, a pressing, a pre-drying, a surface sizing, a post-drying and a press polishing.
8. The manufacturing method according to claim 7, wherein the mass concentration after slurry preparation is 3.0-3.5%; the concentration of the pulp during the pulp flushing is 0.85-0.95%.
9. The white release base paper obtained by the manufacturing method according to any one of claims 1 to 8, having a product basis weight of 80 to 120g/m 2 The roughness is within 3 microns.
10. The white release base paper according to claim 9, characterized in that the white release base paper has a smoothness of not less than 80s and a fracture length of not less than 7000m; transverse tearing strength is more than or equal to 300mN, paper layering force is more than or equal to 1.3N/25mm, and whiteness is 84-86 percent ISO.
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