CN115506181B - White release base paper and manufacturing method thereof - Google Patents
White release base paper and manufacturing method thereof Download PDFInfo
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- CN115506181B CN115506181B CN202211245621.7A CN202211245621A CN115506181B CN 115506181 B CN115506181 B CN 115506181B CN 202211245621 A CN202211245621 A CN 202211245621A CN 115506181 B CN115506181 B CN 115506181B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000004513 sizing Methods 0.000 claims abstract description 42
- 102000004190 Enzymes Human genes 0.000 claims abstract description 38
- 108090000790 Enzymes Proteins 0.000 claims abstract description 38
- 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 26
- 239000002002 slurry Substances 0.000 claims abstract description 25
- 238000004537 pulping Methods 0.000 claims abstract description 21
- 239000002023 wood Substances 0.000 claims abstract description 20
- 238000003490 calendering Methods 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
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- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 7
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- 229940088598 enzyme Drugs 0.000 claims description 37
- 238000010009 beating Methods 0.000 claims description 30
- 230000032798 delamination Effects 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 15
- 102000005575 Cellulases Human genes 0.000 claims description 11
- 108010084185 Cellulases Proteins 0.000 claims description 11
- 229940059442 hemicellulase Drugs 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 8
- 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
- 238000002360 preparation method 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
- 239000004576 sand Substances 0.000 claims description 6
- 238000007872 degassing Methods 0.000 claims description 5
- 230000008719 thickening Effects 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 abstract description 16
- 239000010703 silicon Substances 0.000 abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 15
- 238000012545 processing Methods 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 abstract description 2
- 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 13
- 239000001913 cellulose Substances 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 9
- 239000007888 film coating Substances 0.000 description 8
- 238000009501 film coating Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- -1 hydroxypropyl Chemical group 0.000 description 6
- 239000011268 mixed slurry Substances 0.000 description 6
- 238000012805 post-processing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 239000011121 hardwood Substances 0.000 description 5
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 4
- 229920002488 Hemicellulose Polymers 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
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- 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
- 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
- 238000007873 sieving Methods 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 238000005507 spraying Methods 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
- 239000004278 EU approved seasoning Substances 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
- 238000004061 bleaching Methods 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229940106157 cellulase Drugs 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- HEBKCHPVOIAQTA-NGQZWQHPSA-N d-xylitol Chemical compound OC[C@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-NGQZWQHPSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 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
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002025 wood fiber 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
- 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 application 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 5-15 percent: pulp is prepared by taking bleached sulfate needle wood chemical pulp and bleached sulfate broad-leaved wood chemical pulp as fiber raw materials in a proportion of 85-95%, and a base paper product is sequentially prepared by seasoning, impurity removal, sizing, net part dehydration molding, squeezing, pre-drying, surface sizing, post-drying and calendaring; the bleached sulfate broadleaf chemical pulp adopts compound enzyme to assist pulping, so that the pulping degree is controlled at 42-46SR; the sizing slurry adopts nonionic hydroxypropyl guar gum with the weight of more than 1.5kg/t paper. The white release base paper product prepared by the application has excellent paper surface fineness, good layering force and good uniformity, and has excellent laminating and silicon processing performances.
Description
Technical Field
The application 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 release paper which can prevent prepreg from adhering and can protect prepreg from being polluted. The release paper is made by compounding anti-sticking substances on base paper or base 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 grammage varies from 35 to 250 grams per square meter. From the color point of view, the release paper mainly comprises single silicon white release paper and single silicon yellow (blue) release paper. The single-silicon white release paper refers to plain paper on one side and silicone oil on the other side; the white release base paper needs to be subjected to processing operations such as film spraying, silicon coating and the like in the later stage.
In China, the white release base paper is mainly classified into four grades. The first grade is base paper mainly subjected to double-sided film coating in the later stage, and is used for manufacturing adhesive tapes and the like; the second gear is mainly used for reflecting materials, car body stickers, mobile phone stickers and the like; the third gear is mainly used for cold mounting of films; the fourth grade is mainly used for the self-adhesive products. Wherein, the post-processing of the release base paper of the first grade and the second grade 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 paper-making products have large domestic consumption, good paper delamination force and excellent processing performances such as film coating, but the paper surface fineness is still to be further improved.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide high-grade white release base paper and a manufacturing method thereof, and the white release base paper product prepared by the application has excellent paper surface fineness, good layering force and good uniformity and has excellent film spraying and silicon feeding processability.
The application provides a manufacturing method of white release base paper, which comprises the following steps: according to 5-15 percent: pulp is prepared by taking bleached sulfate needle wood chemical pulp and bleached sulfate broad-leaved wood chemical pulp as fiber raw materials in a proportion of 85-95%, and a base paper product is sequentially prepared by seasoning, impurity removal, sizing, net part dehydration molding, squeezing, pre-drying, surface sizing, post-drying and calendaring;
the bleached sulfate broadleaf chemical pulp adopts compound enzyme to assist pulping, so that the pulping degree is controlled at 42-46SR; the sizing slurry adopts nonionic hydroxypropyl guar gum with the weight of more than 1.5kg/t paper.
In an embodiment of the present application, the compound enzyme comprises an endo-cellulase, an exo-cellulase, an endo-hemicellulase and an exo-hemicellulase as main components.
In the embodiment of the application, the amount of the compound enzyme for assisting pulping is 0.3-0.5kg/t pulp.
In an embodiment of the application, the beating degree of the bleached sulfate needle wood chemical pulp is controlled to be 48-52SR.
In an embodiment of the application, 2-5kg/t of nonionic hydroxypropyl guar is used in the sizing slurry.
In an embodiment of the application, the surface sizing is added with 1-5kg/t of sodium carboxymethyl cellulose of paper.
In the embodiment of the application, the base paper product is formed by sequentially carrying out thick paste screening, seasoning, pulp flushing, sand removal and gas removal, sizing, paper machine screening, pulp flowing, net part dehydration forming, pressing, pre-drying, surface sizing, post-drying and calendaring.
In the embodiment of the application, the mass concentration of the pulp after the pulp is mixed is 3.0-3.5%; the concentration of the pulp is 0.85-0.95%.
The application 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; the transverse tear degree is more than or equal to 300mN, the paper delamination force is more than or equal to 1.3N/25mm, and the whiteness is 84-86% ISO.
The white release base paper is prepared from bleached sulfate needle wood chemical pulp (NBKP) and bleached sulfate broad-leaved wood chemical pulp (LBKP), wherein the weight ratio of the pulp is as follows: NBKP 5-15%; LBKP 85-95%; the base paper product is sequentially prepared by seasoning, impurity removal, sizing, net part dehydration molding, squeezing, pre-drying, surface sizing, post-drying and calendaring. Wherein, the broad-leaved wood chemical pulp LBKP is obtained by adopting compound enzyme to assist pulping, and the pulping degree is 42-46SR; the sizing slurry adopts nonionic hydroxypropyl guar gum with the weight of more than 1.5kg/t paper. The high-grade paper product of the application only uses a small amount of needle-leaved wood chemical pulp, but uses finer broad-leaved wood chemical pulp fiber as the main production, which is beneficial to obtaining excellent paper surface fineness, better uniformity and the like. Because less needle leaf wood chemical pulp is adopted, and in order to ensure the paper layering force of more than 1.3N/(25 mm) so as to meet the requirement of the layering force when the paper is used as an adhesive tape, the application can add more than 1.5kg/t of nonionic hydroxypropyl guar gum before screening of a paper machine. The application can ensure that the delamination force of the paper reaches the requirement of application under the condition of low long fiber slurry (NBKP) proportion, and ensures the excellent stripping performance of the post-processing adhesive tape.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a manufacturing method of white release base paper, which comprises the following steps:
bleached sulfate needle wood chemical pulp and bleached sulfate broad wood chemical pulp (adopting compound enzyme to assist pulping, controlling the beating degree to be 42-46 SR) are used as fiber raw materials, and the ratio is 5-15 percent: proportioning 85-95% of slurry, sequentially carrying out seasoning, impurity removal and sizing, wherein nonionic hydroxypropyl guar gum with a weight of more than 1.5kg/t paper is adopted in the slurry; and then carrying out dehydration molding on the net part, squeezing, pre-drying, surface sizing, post-drying and calendaring to obtain the white release base paper product.
The white release base paper prepared by the process disclosed by the application meets the requirements of excellent fineness, good production running performance, good paper delamination force, good paper surface cleanliness, uniformity and the like of paper, and is favorable for post-processing application.
In the application, the fiber pulp is bleached sulfate needle wood chemical pulp (NBKP) and bleached sulfate broad wood chemical pulp (LBKP), and the fiber pulp specifically comprises the following components in parts by weight: 5-15% NBKP; 85-95% LBKP. Bleached sulfate softwood pulp is an English abbreviation NBKP, and is a chemical method slurry prepared by taking softwood as a raw material and adopting a sulfate method for steaming and bleaching, and has wide application; LBKP is prepared from hardwood, and the hardwood pulp has short fiber. The embodiment of the application mainly produces the broad-leaved wood chemical pulp LBKP with finer fibers, and uses a small amount of needle-leaved wood chemical pulp, thereby being beneficial to achieving the higher paper surface fineness requirement, and effectively improving the paper uniformity and the like. The fiber slurry according to the embodiment of the application can be commercially available or prepared.
In order to further reduce the roughness of paper, improve the strength of paper and improve the uniformity of paper, the embodiment of the application adopts compound enzyme to assist the pulping of broad-leaved wood chemical pulp (LBKP), and the pulping degree is 42-46SR. The fiber is swelled, cut off and the surface is fibrillated by pulping, so that certain papermaking performance is given to the pulp; the degree of beating (also called beating degree) reflects the difficulty of the slurry dewatering, and the higher the beating degree is, the more difficult the slurry is to dewater. In addition to mechanical shearing action, beating of LBKP in the embodiment of the application is assisted by complex enzyme (compounded by various enzyme preparations).
In the application of pulping enzyme, as the specificity of enzyme preparation is very strong, the raw materials for one enzyme are single, and the application adopts the compound enzyme to assist the pulping of hardwood pulp fiber, thereby overcoming the limitation of single enzyme, and effectively improving the pulping effect of the fiber. Specifically, the main components of the compound enzyme are endo-exo-cellulase and endo-exo-hemicellulase. According to mass fraction, the cellulose in the complex enzyme is 70-80%, wherein the cellulose exonuclease is 25-35%, and the cellulose endonuclease is 35-45%; 20-30% of hemicellulase, 5-10% of hemicellulose exoenzyme and 10-25% of cellulose endoenzyme. And the overall activity of the enzyme preparation is 2500u/g or more.
In an embodiment of the application, the endo-and exo-cellulase assisted beating principle comprises: the broad-leaved wood chemical pulp is mainly composed of cellulose, and endo-cellulase in the complex enzyme acts on an amorphous region of cellulose molecules, so that glycosidic bonds can be randomly degraded in the cellulose molecules, long-chain cellulose molecules are cut off, and a large number of small cellulose molecules with non-reducing terminal groups are generated. Exocellulases act on the ends of cellulose linear molecules, which cleave glycosidic bonds from the reducing or non-reducing ends of cellulose molecules, producing cellobiose. The degradation of cellulose and the synergistic action of the multiple components complete the auxiliary beating of the hardwood cellulose.
And, the endo-and exo-hemicellulase assists the beating principle to include: the broad-leaved wood chemical pulp contains a large amount of hemicellulose, wherein endo-hemicellulase acts on xyloside bonds in the main chain of hemicellulose xylan, and the main hydrolysis products of the broad-leaved wood chemical pulp are xylooligosaccharide and a small amount of xylose. Exo-hemicellulases act on the non-reducing ends of hemicellulose xylans and xylooligosaccharides, the product being xylose.
According to the embodiment of the application, the LBKP pulping is assisted by the compound enzyme, so that the fibrillation and cutting of the broad-leaved wood fiber are enhanced, and the fineness and uniformity of the subsequent paper are effectively improved. 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 a temperature, pH, has a great influence on the use effect of the enzyme. In the examples of the present application, the following is the experimental content of improving the pulping effect of sulfate hardwood chemical pulp (LBKP) by using a complex enzyme:
TABLE 1 physical indicator detection of Complex enzyme-assisted LBKP pulping in some examples
The laboratory was set with a 1# -4# enzyme preparation (enzyme dosage in beating was 0.1,0.2,0.3,0.4kg/t pulp) and a blank, and after sheet making, calendering was performed under the same conditions, and then quantitative, fracture length, tear index, roughness, delamination force were measured as shown in table 1. The experiment was carried out without adding filler calcium carbonate, and the ash content was less than 1%. In actual production, because the filler calcium carbonate is needed to be added in the seasoning process, the ash content of the paper is controlled to be 18-20%, and the layering ratio of the paper is lower than that of an experimental result.
In connection with the above study of the present application, it is preferable that the amount of the complex enzyme is controlled to 0.3 to 0.5kg/t of slurry, the roughness is controlled to 3 μm or less, and the delamination force is significantly improved as compared with the case where the complex enzyme is not used. In the preferred embodiment of the present application, LBKP is used to assist beating with complex enzymes, and the amount of the slurry can be 0.3-0.5kg/t, and the beating degree is controlled to be 42-46SR.
Further, in order to improve wet end drainage performance and paper strength in paper production, the NBKP beating degree is preferably controlled to be 48-52SR. The applicant has determined the beating degree control range through innovative experimental study, and the following experimental results and analysis are as follows:
TABLE 2 influence of NBKP freeness on the stratification forces and drainage rates in some examples
| Freeness SR | Delamination force N/(25 mm) | Drainage 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: the experiment does not add filler calcium carbonate, and the ash content is lower than 1%. In actual production, because the filler calcium carbonate is needed to be added in the seasoning process, the ash content of the paper is controlled to be 18-20%, and the layering ratio of the paper is lower than that of an experimental result.
The above experiment mainly examines the influence of beating degree on NBKP layering force and drainage speed, wherein the drainage speed mainly examines the drainage performance of paper materials at the paper machine net part, the speed is too high, the paper is not well formed, the uniformity is poor, the speed is too low, the net part drainage is too slow, and the problems of paper breakage at the wet part and high energy consumption at the drying part are easy to occur in papermaking. From experimental data, when NBKP freeness is between 48SR and 52SR, the delamination force is at a higher level and the drainage rate is moderate. If the beating degree is 52SR or more, the delamination force is not increased greatly, but the drainage speed is reduced greatly.
The embodiment of the application adopts NBKP and LBKP with the weight ratio of the slurry to prepare the slurry, the slurry is mixed and prepared into mixed slurry with the mass concentration of 3.0-3.5%, and the mixed slurry passes through a thick slurry sieve, seasonings and flushing, wherein the concentration can be controlled to be 0.85-0.95%, and then the mixed slurry is subjected to sand removal, degassing and sizing.
In the embodiment of the application, more than 1.5kg/t of nonionic hydroxypropyl guar gum, preferably 2-5kg/t of paper, is added before screening of the paper machine. Guar Gum (GG) is a natural galactomannan, hydroxypropyl guar gum (HPG) is a modified material that hydroxypropylates GG. In specific examples, the hydroxypropyl guar has a viscosity of 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 in the embodiment of the application, and the linear 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 better paper strength reinforcing effect, and therefore, the paper delamination force can reach more than 1.3N/(25 mm) under the condition of low-length fiber pulp (NBKP) proportioning, the excellent stripping performance of the post-processing adhesive tape is ensured, and the cost is saved.
For example, the following is the experimental result and analysis of the influence of nonionic hydroxypropyl guar on the layering force of paper, the slurry ratio adopted in the experiment is NBK10% and LBKP90%, wherein NBKP freeness 51SR and LBKP freeness 44SR, and ash content is controlled to be 18.5-19.0%.
Table 3 experimental results of the effect of nonionic hydroxypropyl guar on sheet delamination force in some examples
The experimental result shows that when the ash content of the paper is 18.5-19.0%, the hydroxypropyl guar gum is added, so that the layering force of the paper can be obviously improved, and when the dosage reaches 2.0 kg/ton of paper, the layering force can reach more than 1.30N/(25 mm). The embodiment of the application further combines the layering force and the production cost factors, and the dosage of the hydroxypropyl guar is controlled to be 2-5 kg/ton paper.
The embodiment of the application prepares white release base paper through paper machine screening, head box, wire section dehydration molding, pressing, front drying, surface sizing, post drying, calendaring and the like. The wet end of paper making includes a wire section having a forming wire, a headbox, etc., and a press section having a press roll as the main equipment. In the wet end process of the paper machine, the addition of sizing agents, fillers and other chemicals is critical to the performance of the paper.
In the embodiment of the application, the web portion is dehydrated, pressed, dried and the like which are common processes. The paper is filled with light calcium carbonate with the filling amount of 16-22% and the adding point before the paper machine screen. The dosage of the polyacrylamide which is a common retention aid is 0.2-0.5kg/t of paper, and the adding point is after the paper machine is screened. The pressing adopts two-step shoe pressing, the pressure of a pressing area is controlled to be 600-900KN/m, a front drying cylinder is divided into three sections of steam passing, and the temperature control range of a cylinder surface is as follows: one section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; after drying (after surface sizing), two sections of steam are introduced, except for the last two cold cylinders, the temperature of the cylinder surface is controlled to be 80-115 ℃, and the temperature of the cylinder surface of the last two cylinders is controlled to be 30-50 ℃ (the temperature of the cylinder is reduced by introducing cold water); certain surface properties can be imparted to the paper by surface sizing; the calendaring process is a process before coiling in the paper manufacturing process, and mainly improves the surface smoothness of the paper.
In order to further improve the surface fineness and the surface strength of paper, sodium carboxymethylcellulose (CMC) of 1-5kg/t paper is preferably added to the surface sizing according to the embodiment of the application. The embodiment of the application also adds filler calcium carbonate, which can fill the gaps among fibers, improve the paper smoothness and the like.
According to the embodiment of the application, the white release base paper product is obtained through coiling and packaging; the embodiment of the application 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 paste, has low paper surface roughness, and has roughness controlled to be within 3 microns (the roughness of the general release base paper is more than 4 microns) so as to prevent air bubbles from being generated when the mobile phone film or vehicle body paste advertisement.
The main parameters of the product prepared by the embodiment of the application are as follows: quantification of 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; the transverse tear degree is more than or equal to 300mN, the paper delamination force is more than or equal to 1.3N/(25 mm), and the whiteness is 84-86% ISO.
The embodiment of the application mainly adopts the following technology: (1) The slurry proportion is mainly LBKP, so that the fineness and uniformity of paper can be effectively improved; (2) In order to effectively improve the fineness, uniformity and layering force of paper, the beating degree of NBKP is controlled to be 48-52SR, and the beating degree of LBKP is controlled to be 42-46SR, wherein the LBKP adopts complex enzyme to assist beating, so that the fineness, the roughness and the uniformity of the paper are improved. (3) 2-5kg/t nonionic hydroxypropyl guar gum is preferably adopted in the pulp, and has better paper strength enhancing effect, so that the paper delamination force can reach more than 1.3N/25mm under the condition of low long fiber pulp (NBKP) proportioning, the excellent stripping performance of the post-processing adhesive tape is ensured, and meanwhile, the cost is saved; (4) In the surface sizing, 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 application researches and develops the high-grade release base paper, which has great significance for improving the product grade of enterprises, improving the profit capability and improving the image of the enterprises.
In order to better understand the technical content of the present application, the following provides specific examples to further illustrate the present application. The mass ratio is the mass ratio in the application unless otherwise specified.
The complex enzymes of the following examples are commercially available, and the main components are cellulases and hemicellulases, and their total enzyme activities are greater than or equal to 2500u/g. Hydroxypropyl guar has a viscosity of 2000-4000mpa.s (1% aqueous solution).
Example 1
The beating degree of the bleached sulfate needle wood chemical pulp (NBKP) is controlled to be 49SR, and the beating degree of the bleached sulfate broad wood chemical pulp (LBKP) is controlled to be 43SR; the beating of LBKP is carried out with the assistance of complex enzyme, and the dosage of complex enzyme is 0.3kg/t pulp.
Proportioning 15% of NBKP and 85% of LBKP according to the weight ratio of the slurry, preparing the mixed slurry into 3.0% of concentration, passing through a thick paste screen, seasoning and flushing, controlling the concentration at 0.9% at this time, removing sand and degassing, sizing, adding 3kg/t of nonionic hydroxypropyl guar gum of paper before screening by a paper machine, dehydrating and forming by the paper machine screen, a head box and a net part, squeezing, pre-drying, surface sizing, post-drying, calendaring, and finally coiling and packaging to obtain white release base paper.
Among the wet end chemicals used include in particular: the filling amount of the light calcium carbonate is 18 percent, and the adding point is arranged before the paper machine sieve. The retention aid polyacrylamide dosage is 0.3kg/t paper, and the adding point is after the paper machine sieves.
The pressing adopts two-step shoe pressing, the pressure of a pressing area is respectively controlled at 700 KN/m and 800KN/m, a front drying cylinder is divided into three sections of steam passing, and the temperature control range of a cylinder surface is as follows: one section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; drying and introducing steam in two sections, wherein the temperature of the cylinder surface is controlled to be between 80 and 115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled to be between 30 and 50 ℃; in the surface sizing, 2kg/t of sodium carboxymethyl cellulose of paper is added, the concentration of the sizing material of the surface sizing is 18%, the viscosity is 15mPa.S, the calendering adopts single-nip soft calendering, the pressure is 120KN/m, and the temperature of a hot roller is 140 ℃.
Measured: quantification of 80g/m 2 Roughness 2.5 μm, smoothness 88s, fracture length 8250m; the transverse tear strength was 325mN, the sheet delamination force was 1.45N/(25 mm), the whiteness was 85.8% ISO.
The paper surface has good uniformity and uniform thickness, and has excellent laminating and silicon processing performances. To ensure the performance of film coating and silicon coating, the transverse quantitative deviation of the detected paper web is lower than 1.5g/m 2 Found 1.0g/m 2 . The lateral thickness deviation was below 2.5 microns, measured at 1.5 microns. In addition, the peeling force after the silicon is coated on the film is less than 0.2N/(25 mm), and the average measured value is 0.14N/(25 mm).
Example 2
The beating degree of the bleached sulfate needle wood chemical pulp (NBKP) is controlled to be 50SR, the beating degree of the bleached sulfate broad wood chemical pulp (LBKP) is controlled to be 44SR, the beating of the LBKP is assisted by compound enzyme, and the dosage of the compound enzyme is 0.4kg/t pulp.
The preparation method comprises the steps of (1) proportioning NBKP 10% and LBKP90% by weight according to the slurry weight ratio, preparing the mixed slurry into a slurry with the concentration of 3.2%, passing through a thick paste screen, seasoning and pulp flushing, controlling the concentration at 0.95%, removing sand and degassing, sizing, adding 4kg/t of nonionic hydroxypropyl guar gum of paper before screening by a paper machine, and then dehydrating and forming by the paper machine screen, a head box, screen part, squeezing, pre-drying, surface sizing, post-drying, calendaring, and finally coiling and packaging to obtain white release base paper.
Among the wet end chemicals used include in particular: the filling amount of the light calcium carbonate is 19 percent, and the adding point is before the paper machine sieve. The retention aid polyacrylamide dosage is 0.35kg/t paper, and the adding point is after the paper machine sieves.
The pressing adopts two-step shoe pressing, the pressure of a pressing area is respectively controlled at 750 KN/m and 850KN/m, a front drying cylinder is divided into three sections of steam passing, and the temperature control range of a cylinder surface is as follows: one section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; drying and introducing steam in two sections, wherein the temperature of the cylinder surface is controlled to be between 80 and 115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled to be between 30 and 50 ℃; in the surface sizing, 3kg/t of sodium carboxymethyl cellulose of paper is added, the concentration of the sizing material of the surface sizing is 15%, the viscosity is 12mPa.S, the calendering adopts single-nip soft calendering, wherein the pressure is 125KN/m, and the temperature of a hot roller is 128 ℃.
Measured: quantification of 100g/m 2 Roughness 2.3 μm, smoothness 83s, fracture length 7100m; the transverse tear 378mN, the paper delamination force 1.55N/(25 mm), whiteness 84.8% ISO.
To ensure the performance of film coating and silicon coating, the transverse quantitative deviation of the detected paper web is lower than 1.5g/m 2 Actual measurement of 1.2g/m 2 . The lateral thickness deviation was below 2.5 microns, measured at 1.8 microns. In addition, the peeling force after the silicon is coated on the film is less than 0.2N/(25 mm), and the average measured value is 0.12N/(25 mm).
Example 3
The beating degree of the bleached sulfate needle wood chemical pulp (NBKP) is controlled to be 51SR, the beating degree of the bleached sulfate broad wood chemical pulp (LBKP) is controlled to be 45SR, the beating of the LBKP is assisted by compound enzyme, and the dosage of the compound enzyme is 0.5kg/t pulp.
The preparation method comprises the steps of (1) proportioning NBKP 5% and LBKP95% by weight according to the weight proportion of slurry, preparing the mixed slurry into 3.2% concentration, sieving with a thick paste sieve, seasoning and flushing, controlling the concentration at 0.92% at the moment, removing sand and degassing, sizing, adding 4.5kg/t of nonionic hydroxypropyl guar gum of paper before sieving with a paper machine, dehydrating and molding with a paper machine sieve, a head box and a net part, squeezing, pre-drying, surface sizing, post-drying, calendaring, and finally coiling and packaging to obtain white release base paper.
Among the wet end chemicals used include in particular: the light calcium carbonate is filled in the amount of 17% and the adding point is before the paper machine screen. The retention aid polyacrylamide dosage is 0.4kg/t paper, and the adding point is after the paper machine sieves.
The pressing adopts two-step shoe pressing, the pressure of a pressing area is respectively controlled at 690 KN/m and 830KN/m, a front drying cylinder is divided into three sections of steam passing, and the temperature control range of a cylinder surface is as follows: one section is 40-80 ℃, the second section is 80-105 ℃, and the third section is 90-115 ℃; drying and introducing steam in two sections, wherein the temperature of the cylinder surface is controlled to be between 80 and 115 ℃ except for the last two cold cylinders, and the temperature of the cylinder surface of the last two cylinders is controlled to be between 30 and 50 ℃; in the surface sizing, sodium carboxymethylcellulose of 4kg/t paper is added, the concentration of the surface sizing material is 16%, the viscosity is 11mPa.S, the calendering adopts single-nip soft calendering, wherein the pressure is 118KN/m, and the temperature of a hot roller is 135 ℃.
Measured: quantification of 120g/m 2 Roughness 2.1 μm, smoothness 86s, fracture length 7050m; the transverse tear strength was 432mN, the sheet delamination force was 1.45N/(25 mm), and the whiteness was 85.2% ISO.
To ensure the performance of film coating and silicon coating, the transverse quantitative deviation of the detected paper web is lower than 1.5g/m 2 Found 1.0g/m 2 . The lateral thickness deviation was below 2.5 microns, measured at 1.3 microns. In addition, the peeling force after the silicon is coated on the film is less than 0.2N/(25 mm), and the average measured value is 0.13N/(25 mm).
From the above examples, the high-grade white release base paper prepared by the method has excellent paper surface fineness, good delamination force, clean paper surface, uniform thickness, good uniformity, excellent performance in post-processing applications such as film coating and silicon coating, and wide prospect.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this application, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the application, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present application.
Claims (5)
1. The manufacturing method of the white release base paper is characterized by comprising the following steps of:
according to the weight proportion of the pulp, 5-15% of bleached sulfate needle-leaved wood chemical pulp and 85-95% of bleached sulfate broad-leaved wood chemical pulp are used as fiber raw materials for pulp preparation, and a base paper product is sequentially prepared by seasoning, impurity removal, sizing, net part dehydration molding, squeezing, pre-drying, surface sizing, post-drying and calendaring;
the bleached sulfate broadleaf chemical pulp adopts compound enzyme to assist pulping, so that the beating degree is controlled at 42-46 DEG SR; the main components of the compound enzyme are endo-cellulase, exo-cellulase, endo-hemicellulase and exo-hemicellulase, wherein the mass fraction of the endo-cellulase is 35-45%, the mass fraction of the exo-cellulase is 25-35%, the mass fraction of the endo-hemicellulase is 10-25%, and the mass fraction of the exo-hemicellulase is 5-10%; the dosage of the auxiliary pulping of the compound enzyme is 0.3-0.5kg/t pulp; the beating degree of the bleached sulfate needle wood chemical pulp is controlled to be 48-52 DEG SR; the sizing slurry adopts 2-5kg/t of nonionic hydroxypropyl guar gum of paper; the surface sizing is added with 1-5kg/t of sodium carboxymethyl cellulose of paper;
the basis weight of the base paper product is 80-120g/m 2 。
2. The method according to claim 1, wherein the base paper product is formed by sequentially passing through a pulp thickening screen, seasoning, pulp washing, sand removal and degassing, sizing, paper machine screening, pulp flowing, wire section dehydration forming, pressing, pre-drying, surface sizing, post-drying, and calendaring.
3. The method according to claim 2, wherein the mass concentration after the slurry preparation is 3.0 to 3.5%; the concentration of the pulp is 0.85-0.95%.
4. A white release liner obtained by the production process according to any one of claims 1 to 3, having a product basis weight of 80 to 120g/m 2 The roughness is within 3 microns.
5. The white release base paper according to claim 4, wherein the smoothness of the white release base paper is not less than 80s, and the fracture length is not less than 7000m; the transverse tear degree is more than or equal to 300mN, the paper delamination force is more than or equal to 1.3N/25mm, and the whiteness is 84-86% ISO.
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