CN115012250A - Double-sided offset paper and preparation method thereof - Google Patents
Double-sided offset paper and preparation method thereof Download PDFInfo
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- CN115012250A CN115012250A CN202210802843.8A CN202210802843A CN115012250A CN 115012250 A CN115012250 A CN 115012250A CN 202210802843 A CN202210802843 A CN 202210802843A CN 115012250 A CN115012250 A CN 115012250A
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- double
- offset paper
- bleaching
- sided offset
- whiteness
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- 238000002360 preparation method Methods 0.000 title abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 236
- 238000004061 bleaching Methods 0.000 claims abstract description 87
- 239000000049 pigment Substances 0.000 claims abstract description 77
- 239000000126 substance Substances 0.000 claims abstract description 56
- 239000001052 yellow pigment Substances 0.000 claims abstract description 54
- 125000002091 cationic group Chemical group 0.000 claims abstract description 52
- OIQPTROHQCGFEF-UHFFFAOYSA-L chembl1371409 Chemical compound [Na+].[Na+].OC1=CC=C2C=C(S([O-])(=O)=O)C=CC2=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 OIQPTROHQCGFEF-UHFFFAOYSA-L 0.000 claims abstract description 39
- 229920002472 Starch Polymers 0.000 claims abstract description 35
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- 238000000034 method Methods 0.000 claims description 41
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- 239000007844 bleaching agent Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 9
- 239000004155 Chlorine dioxide Substances 0.000 claims description 8
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 238000010411 cooking Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000009897 hydrogen peroxide bleaching Methods 0.000 claims description 2
- 239000006081 fluorescent whitening agent Substances 0.000 abstract description 20
- 238000003912 environmental pollution Methods 0.000 abstract description 8
- 230000004438 eyesight Effects 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 6
- 229920002401 polyacrylamide Polymers 0.000 description 34
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- 125000000129 anionic group Chemical group 0.000 description 17
- 229910000278 bentonite Inorganic materials 0.000 description 17
- 239000000440 bentonite Substances 0.000 description 17
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 17
- -1 alkenyl succinic anhydride Chemical compound 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 16
- 229940014800 succinic anhydride Drugs 0.000 description 16
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- 208000027418 Wounds and injury Diseases 0.000 description 5
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- 230000000007 visual effect Effects 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 230000036541 health Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000011122 softwood Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
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- 230000014759 maintenance of location Effects 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 241000218631 Coniferophyta Species 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Images
Classifications
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- 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
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- 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
-
- 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
- D21H21/28—Colorants ; Pigments or opacifying agents
Landscapes
- Paper (AREA)
Abstract
The invention discloses double-sided offset paper and a preparation method thereof, relates to the technical field of papermaking, and aims to solve the problems that the existing double-sided offset paper is high in paper hue and damages the eyesight of readers due to color matching of a fluorescent whitening agent. The whiteness of the double-sided offset paper is 28% -38%, and the double-sided offset paper comprises: high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers, wherein the yellow pigments comprise direct yellow 147 pigments and direct yellow 11 pigments. The preparation method is used for preparing the double-sided offset paper. The double-sided offset paper and the preparation method thereof provided by the invention are used for reducing the hue of the double-sided offset paper, reducing the production cost and reducing the environmental pollution.
Description
Technical Field
The invention relates to the field of papermaking, in particular to double-sided offset paper and a preparation method thereof.
Background
In the existing double-offset paper production process, a large amount of fluorescent whitening agent needs to be added for toning, for example: disulfonic acid and hexasulfonic acid, but the stabilizer component of the fluorescent whitening agent contains urea, which is not left in paper in production, but enters a sewage treatment system along with the discharge of white water, so that the sewage denitrification treatment and discharge pressure are large, and the environmental protection is not facilitated. Furthermore, the fluorescent whitening agents are expensive to apply in the slurry and the use of fluorescent whitening agents for tinting leads to high chemical costs.
Meanwhile, the current high-whiteness double offset paper product is high in paper hue caused by color matching of a fluorescent whitening agent, and the hue difference of the paper when the paper is made into a final finished product is synchronously high, so that the vision health of a reader is damaged. Therefore, it is very critical to find a preparation method which can reduce the color phase of the double-sided offset paper, has low cost and is environment-friendly.
Disclosure of Invention
The invention aims to provide the double-sided offset paper and the preparation method thereof, which are used for reducing the hue of the double-sided offset paper, reducing the production cost and reducing the environmental pollution.
In order to achieve the above object, in a first aspect, the present invention provides the following technical solutions:
a double-sided offset paper, characterized in that the CIE whiteness of the double-sided offset paper is 28% -38%, the double-sided offset paper comprises: high-whiteness long fibers, low-bleached short fibers, chemimechanical fibers, cationic starch, and yellow pigments dispersed in the high-whiteness long fibers, the low-bleached short fibers and the chemimechanical fibers, wherein the yellow pigments comprise a direct yellow 147 pigment and a direct yellow 11 pigment.
Compared with the prior art, the double-sided offset paper provided by the embodiment of the invention comprises high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers, wherein the yellow pigments comprise direct yellow 147 pigments and/or direct yellow 11 pigments. When the yellow pigment is added into the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber of the double-sided offset paper, the direct yellow 147 pigment and the direct yellow 11 pigment have hydrophilicity and strong intermolecular binding capacity, so that the yellow pigment can be well bound with the molecules of the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber, and the dyeing is more uniform. Meanwhile, as the direct yellow 147 pigment is yellow which emits green light and the direct yellow 11 pigment is yellow which emits red light, when the direct yellow 147 pigment and the direct yellow 11 pigment act together, the color of the double offset paper can be beige, and at the moment, the color difference of the double offset paper can be reduced. In addition, the direct yellow 147 pigment and the direct yellow 11 pigment are added into the double-sided offset paper disclosed by the embodiment of the invention, so that the double-sided offset paper has very strong heat-resistant stability and light fastness, the heat-resistant stability can reach 300 ℃, and the light fastness is 7-8 grade, thereby avoiding the fading of the double-sided offset paper. Moreover, the CIE whiteness of the double-sided offset paper disclosed by the embodiment of the invention is 28% -38%, and in the whiteness range, the visual injury caused by overhigh brightness of the double-sided offset paper can be avoided.
Therefore, the high-whiteness long fibers, the low-bleaching short fibers, the chemical mechanical fibers and the yellow pigment in the embodiment of the invention have a synergistic effect, so that the stability of the double-sided offset paper is improved, the whiteness of the double-sided offset paper is reduced, the color difference of the double-sided offset paper is reduced on the premise of not influencing the performance of the paper, and the vision health of a reader is protected. And because the fluorescent whitening agent is not used in the application, the process, equipment cost and labor cost in the process of applying the fluorescent whitening agent in the pulp are reduced, and meanwhile, the environmental pollution caused by urea contained in the stabilizer component of the fluorescent whitening agent is avoided, so that the production cost is further reduced, and the environment is protected.
In a second aspect, the present invention also provides a method for preparing double-sided offset paper, comprising:
uniformly mixing high-white long fiber slurry, low-bleaching short fiber slurry and chemical mechanical fiber slurry to obtain first mixed slurry;
adding a yellow pigment into the first mixed slurry to obtain second mixed slurry;
and manufacturing the second mixed pulp into double-sided offset paper.
Compared with the prior art, the beneficial effects provided by the invention are the same as those of the first aspect, and are not described herein again.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
FIG. 1 shows a schematic flow diagram of a method of making a double-offset paper according to an embodiment of the present invention;
fig. 2 shows a schematic flow diagram of a method of making low-bleached staple fibers according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
Double offset paper is generally referred to as offset paper. Offset paper, known as "forest paper", is mainly used in lithographic (offset) printing presses or other printing presses for printing higher-level color prints, and is suitable for printing monochromatic or multicolor papers for book and periodical covers, texts, inserts, newspapers, maps, posters, color trademarks and various packages.
In production and life, high-whiteness double-offset paper is usually used, however, the existing high-whiteness double-offset paper has high requirement on the whiteness of base paper, the hue of the paper is high, and the vision of a reader is easily damaged, and meanwhile, a large amount of fluorescent whitening agent needs to be added in the manufacturing process of the existing high-whiteness double-offset paper, so that the existing high-whiteness double-offset paper is not beneficial to environmental protection.
In order to solve the above problems, the embodiment of the invention provides the double-sided offset paper, which is used for reducing the hue of the double-sided offset paper, reducing the production cost and reducing the environmental pollution.
The embodiment of the invention provides double-sided offset paper, the CIE whiteness of the double-sided offset paper is 28% -38%, and the double-sided offset paper comprises: high-whiteness long fibers, low-bleached short fibers, chemimechanical fibers, cationic starch, and yellow pigments dispersed in the high-whiteness long fibers, the low-bleached short fibers and the chemimechanical fibers, wherein the yellow pigments comprise direct yellow 147 pigments and direct yellow 11 pigments. It will be appreciated that CIE whiteness is the calamity whiteness, and that with the CIE whiteness formula, a weighting factor needs to be added when measuring whiteness.
Compared with the prior art, the double-sided offset paper provided by the embodiment of the invention comprises high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers, wherein the yellow pigments comprise direct yellow 147 pigments and/or direct yellow 11 pigments. When the yellow pigment is added into the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber of the double-sided offset paper, the direct yellow 147 pigment and the direct yellow 11 pigment have hydrophilicity and strong intermolecular binding capacity, so that the yellow pigment can be well bound with the molecules of the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber, and the dyeing is more uniform. Meanwhile, as the direct yellow 147 pigment is yellow which emits green light and the direct yellow 11 pigment is yellow which emits red light, when the direct yellow 147 pigment and the direct yellow 11 pigment act together, the color of the double-sided offset paper can be beige, and at the moment, the color difference of the double-sided offset paper can be reduced. In addition, the direct yellow 147 pigment and the direct yellow 11 pigment are added into the double-sided offset paper provided by the embodiment of the invention, so that the double-sided offset paper has strong heat resistance stability and light fastness, the heat resistance stability can reach 300 ℃, and the light fastness is 7-8 grade, thereby avoiding the fading of the double-sided offset paper. Moreover, the CIE whiteness of the double-sided offset paper disclosed by the embodiment of the invention is 28% -38%, and in the whiteness range, the visual injury caused by overhigh brightness of the double-sided offset paper can be avoided.
Therefore, the high-whiteness long fibers, the low-bleaching short fibers, the chemical mechanical fibers and the yellow pigment in the embodiment of the invention have a synergistic effect, so that the stability of the double-sided offset paper is improved, the whiteness of the double-sided offset paper is reduced, the color difference of the double-sided offset paper is reduced on the premise of not influencing the performance of the paper, and the vision health of a reader is protected. And because the fluorescent whitening agent is not used in the application, the process, equipment cost and labor cost in the process of applying the fluorescent whitening agent in the pulp are reduced, and meanwhile, the environmental pollution caused by urea contained in the stabilizer component of the fluorescent whitening agent is avoided, so that the production cost is further reduced, and the environment is protected.
In an optional mode, the fluorescent value of the double-sided offset paper in the embodiment of the invention is not higher than 0.8, the L value is 94.0-95.0, the a value is-0.8-1.3, and the b value is 11.6-12.6. Wherein, L, a and b are numerical values on a color difference meter, L represents lightness, ranges from 0 to 100, represents that the color is from dark (black) to light (white), a represents red and green, the numerical value changes from positive to negative, represents that the color is from red (positive) to green (negative), b represents yellow and blue, and the numerical value changes from positive to negative, represents that the color is from yellow (positive) to blue (negative). The fluorescent value of the double-sided offset paper is not higher than 0.8, so that the visual injury of a reader caused by the overhigh fluorescent value is avoided. Meanwhile, the L value of the double-sided offset paper is 94.0-95.0, the a value is-0.8-1.3, the b value is 11.6-12.6, and the numerical values of L, a and b are controlled within the numerical value range, so that the chromatic aberration of the double-sided offset paper can be reduced, and the visual injury to a reader due to overlarge chromatic aberration is reduced.
Illustratively, the mass of the direct yellow 147 pigment and the direct yellow 11 pigment per ton of the double-offset paper is 150g to 250g, based on the mass of the yellow pigment per ton of the double-offset paper. The quality of the direct yellow 147 pigment and the direct yellow 11 pigment in each ton of double-sided offset paper of the embodiment of the invention is controlled to be 150 g-250 g, and the direct yellow 147 pigment and the direct yellow 11 pigment have hydrophilicity and strong intermolecular binding capacity, so that the yellow pigment can be well bound with the molecules of the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber. Therefore, only a small amount of direct yellow 147 pigment and direct yellow 11 pigment is needed per ton of double offset paper to uniformly dye the pulp. Meanwhile, the direct yellow 147 pigment is yellow which emits green light, and the direct yellow 11 pigment is yellow which emits red light, so that under the combined action of the direct yellow 147 pigment and the direct yellow 11 pigment and only a small amount of direct yellow 11 pigment is added, the color of the double-sided offset paper is beige, the prepared double-sided offset paper has less color difference, and the eyesight of a reader is protected.
In an alternative mode, the length of the high-whiteness long fibers in the double-sided offset paper of the embodiment of the invention is 2.0mm to 2.5mm, and the length of the low-bleaching short fibers is 0.6 mm to 0.8 mm. It is to be understood that the high whiteness long fibers can be softwood pulp fibers and the low bleach short fibers can be hardwood pulp fibers. The length of the high-whiteness long fiber in the embodiment of the invention is controlled to be 2.0-2.5 mm, and the softwood pulp is used, so that the softwood pulp fiber is long and thin, relatively pure and less in impurity, and therefore, the manufactured double-offset paper has good flexibility, high folding resistance, good tensile strength and good printing performance. The length of the low-bleaching short fiber is controlled to be 0.7mm, hardwood pulp is used, and hardwood pulp fiber is thick and short, so that the manufactured double-sided offset paper is high in bulk, high in stiffness and good in packaging performance. That is, in the double-sided offset paper of the embodiment of the invention, the flexibility, folding strength, tensile strength and printing performance of the double-sided offset paper are increased and the stiffness and packaging performance of the double-sided offset paper are also improved by simultaneously using the high-whiteness long fibers and the low-bleaching short fibers.
For example: the softwood pulp may be produced from conifers and the primary species may include at least one of pine or other conifer species. Hardwood pulp is prepared from hardwood trees, and the main tree species include at least one of eucalyptus, poplar, birch or other hardwood tree species.
Fig. 1 shows a schematic flow chart of a method for preparing the double-sided offset paper according to an embodiment of the present invention. As shown in fig. 1, the method for preparing the double-sided offset paper according to the embodiment of the present invention includes:
step 101: and uniformly mixing the high-whiteness long fiber pulp, the low-bleaching short fiber pulp, the chemical mechanical fiber pulp and the cationic starch to obtain first mixed pulp.
For example: the method comprises the following steps of (1) mixing high-white long fiber pulp, low-bleaching short fiber pulp and chemical mechanical fiber pulp in an oven-dry pulp mass ratio of (10-20): (65-70): (10-20) after uniformly mixing, obtaining oven-dried pulp mixed by high-whiteness long fibers, low-bleaching short fibers and chemical mechanical fibers, adding 7-10 kg of cationic starch into each ton of the mixed oven-dried pulp, and uniformly mixing to obtain first mixed pulp. In the double-sided offset paper of the embodiment of the invention, the quality of the cationic starch is controlled within the range, and the cationic starch can perform adsorption with fibers with negative charges, so that the retention rate of fine fibers is improved. Meanwhile, the cationic starch and the fibers can generate flocculation under the action of high potential of the cationic starch, so that the beating degree of paper is reduced, and water filtration can be accelerated, thereby reducing the concentration of white water, reducing pollution and reducing energy consumption. In addition, the cationic starch can also form hydrogen bonds with fibers, so that the binding force is increased, the dry and wet strength of the double-sided offset paper is improved, and the phenomenon of end breakage in the paper making process is reduced.
Illustratively, in the double-sided offset paper of the embodiment of the invention, the ISO whiteness of the high-whiteness long fiber pulp is 89-90%, the ISO whiteness of the low-bleaching short fiber pulp is 75-85%, and the ISO whiteness of the chemical mechanical fiber pulp is 79-83%.
Step 102: and adding a yellow pigment into the first mixed pulp to obtain second mixed pulp.
Illustratively, a yellow pigment, bentonite, cationic polyacrylamide, anionic polyacrylamide and alkenyl succinic anhydride are added to the first mixed slurry and mixed uniformly to obtain a second mixed slurry. It is understood that the alkenyl Succinic anhydride, abbreviated as asa (alkenyl Succinic anhydride), is used herein as an intra-size neutral sizing agent.
For example: adding 0.15 kg-0.25 kg of direct yellow 147 pigment and 0.15 kg-0.25 kg of direct yellow 11 pigment, 0.25 kg-0.3 kg of cationic polyacrylamide and 0.25 kg-0.3 kg of anionic polyacrylamide, 2.5 kg-3 kg of bentonite, 1.0 kg-1.2 kg of alkenyl succinic anhydride and 220 kg-270 kg of calcium carbonate into each ton of the oven-dried first mixed pulp to obtain second mixed pulp. The double-sided offset paper provided by the embodiment of the invention can ensure that the substances in the pulp are uniformly distributed under the combined action of the yellow pigment, bentonite, cationic polyacrylamide, anionic polyacrylamide and alkenyl succinic anhydride, and the direct yellow 147 pigment and the direct yellow 11 pigment have hydrophilicity and strong intermolecular binding capacity, so that the yellow pigment can be well bound with molecules of high-whiteness long fibers, low-bleaching short fibers and chemical mechanical fibers. Through the matching of the components, the viscosity of the double-sided offset paper is obviously improved, and the flow-off is prevented, so that the stability of the double-sided offset paper is improved. Meanwhile, the cationic polyacrylamide, the anionic polyacrylamide and the bentonite in the embodiment of the invention form a ternary retention system, so that the retention performance of the net part of the base paper can be improved, and the smoothness of the net surface of the base paper can be improved.
Step 103: and manufacturing the second mixed pulp into double-sided offset paper.
Fig. 2 shows a schematic flow diagram of a method of making low-bleached staple fibers according to an embodiment of the present invention. As shown in fig. 2, a method of preparing low-bleached staple fibers according to an embodiment of the present invention includes:
step 201: the short fiber wood chips are sequentially subjected to a cooking process, a washing process and an oxygen delignification process to obtain short fiber slurry.
For example: according to the embodiment of the invention, the short-fiber wood chips are subjected to the cooking process, the washing process and the oxygen delignification process in sequence, so that the lignin can be removed to the maximum extent, the cooking yield is high, and the pulp strength is good.
Step 202: and bleaching the short fiber pulp in sequence through a bleaching process to obtain the low-bleaching short fiber pulp.
For example: the bleaching process comprises a chlorine dioxide first-stage bleaching process, an oxygen bleaching process, a hydrogen peroxide bleaching process, a chlorine dioxide second-stage bleaching process and a chlorine dioxide third-stage bleaching process. The bleaching agent used in the bleaching process comprises chlorine dioxide, oxygen bleaching agent and hydrogen peroxide, and the mass of the bleaching agent contained in each ton of low-bleaching short fiber pulp is 15 kg-20 kg according to the mass of the bleaching agent contained in each ton of low-bleaching short fiber pulp. Therefore, in the preparation process of the low-bleaching short fiber provided by the embodiment of the invention, the mass of the bleaching agent contained in each ton of low-bleaching short fiber pulp is 15 kg-20 kg, which is 3 kg-5 kg lower than the amount of the bleaching agent used in the prior art, so that on one hand, the usage amount of the bleaching agent is reduced, the production cost is reduced, on the other hand, the environmental pollution caused in the post-treatment process of the bleaching agent is also reduced, the environment is protected, and the energy consumption is reduced. In addition, the ISO whiteness of the short fiber is controlled to be 75-85% through the bleaching process, so that sufficient whiteness can be provided for the subsequent addition of yellow pigment, and the CIE whiteness of the double-sided offset paper of the embodiment of the invention can be controlled to be in the range of 28-38%.
According to the double-sided offset paper provided by the embodiment of the invention, when the yellow pigment is added into the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber of the double-sided offset paper, the direct yellow 147 pigment and the direct yellow 11 pigment have hydrophilicity and strong intermolecular binding capacity, so that the yellow pigment can be well bound with the molecules of the high-whiteness long fiber, the low-bleaching short fiber and the chemical mechanical fiber, and the dyeing is more uniform. Meanwhile, as the direct yellow 147 pigment is yellow which emits green light and the direct yellow 11 pigment is yellow which emits red light, when the direct yellow 147 pigment and the direct yellow 11 pigment act together, the color of the double-sided offset paper can be beige, and at the moment, the color difference of the double-sided offset paper can be reduced. In addition, the direct yellow 147 pigment and the direct yellow 11 pigment are added into the double-sided offset paper provided by the embodiment of the invention, so that the double-sided offset paper has strong heat resistance stability and light fastness, the heat resistance stability can reach 300 ℃, and the light fastness is 7-8 grade, thereby avoiding the fading of the double-sided offset paper. Moreover, the CIE whiteness of the double-sided offset paper disclosed by the embodiment of the invention is 28% -38%, and in the whiteness range, the visual injury caused by overhigh brightness of the double-sided offset paper can be avoided.
Therefore, the high-whiteness long fibers, the low-bleaching short fibers, the chemical mechanical fibers and the yellow pigment in the embodiment of the invention have a synergistic effect, so that the stability of the double-sided offset paper is improved, the whiteness of the double-sided offset paper is reduced, the color difference of the double-sided offset paper is reduced on the premise of not influencing the performance of the paper, and the vision health of a reader is protected. And because the fluorescent whitening agent is not used in the application, the process, equipment cost and labor cost in the process of applying the fluorescent whitening agent in the pulp are reduced, and meanwhile, the environmental pollution caused by urea contained in the stabilizer component of the fluorescent whitening agent is avoided, so that the production cost is further reduced, and the environment is protected.
In order to verify the effect of the double-sided offset paper provided by the embodiment of the invention, the embodiment of the invention is proved by comparing the embodiment with the comparative example. It should be understood that the components of the various materials referred to in the following examples are representative components, which are only used to demonstrate experimental results and are not intended to limit the scope of the examples of the present invention.
Example one
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemimechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemimechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 100kg of high-whiteness long fibers, 700kg of low-bleaching short fibers, 200kg of chemical mechanical fibers and 7kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.15kg of direct yellow 147 pigment and 0.15kg of direct yellow 11 pigment, 0.25kg of cationic polyacrylamide and 0.25kg of anionic polyacrylamide, 2.5kg of bentonite, 220kg of calcium carbonate and 1.0kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Example two
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 120kg of high-whiteness long fibers, 690kg of low-bleaching short fibers, 190kg of chemical mechanical fibers and 8kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.16kg of direct yellow 147 pigment and 0.16kg of direct yellow 11 pigment, 0.27kg of cationic polyacrylamide and 0.27kg of anionic polyacrylamide, 2.8kg of bentonite, 230kg of calcium carbonate and 1.2kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
EXAMPLE III
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 200kg of high-whiteness long fibers, 650kg of low-bleaching short fibers, 150kg of chemical mechanical fibers and 10kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.2kg of direct yellow 147 pigment and 0.2kg of direct yellow 11 pigment, 0.3kg of cationic polyacrylamide and 0.3kg of anionic polyacrylamide, 3kg of bentonite, 235kg of calcium carbonate and 1.1kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Example four
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 120kg of high-whiteness long fibers, 680kg of low-bleaching short fibers, 200kg of chemical mechanical fibers and 9kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed pulp, 0.15kg of direct yellow 147 pigment and 0.15kg of direct yellow 11 pigment, 0.28kg of cationic polyacrylamide and 0.28kg of anionic polyacrylamide, 2.8kg of bentonite, 240kg of calcium carbonate and 1.1kg of alkenyl succinic anhydride were added to obtain a second mixed pulp.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
EXAMPLE five
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 200kg of high-whiteness long fibers, 700kg of low-bleaching short fibers, 100kg of chemical mechanical fibers and 7.5kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.25kg of direct yellow 147 pigment and 0.25kg of direct yellow 11 pigment, 0.26kg of cationic polyacrylamide and 0.26kg of anionic polyacrylamide, 2.7kg of bentonite, 250kg of calcium carbonate and 1.2kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
EXAMPLE six
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 150kg of high-whiteness long fibers, 690kg of low-bleaching short fibers, 160kg of chemical mechanical fibers and 8.5kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.19kg of direct yellow 147 pigment and 0.19kg of direct yellow 11 pigment, 0.27kg of cationic polyacrylamide and 0.27kg of anionic polyacrylamide, 2.8kg of bentonite, 255kg of calcium carbonate and 1.2kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
EXAMPLE seven
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 150kg of high-whiteness long fibers, 650kg of low-bleaching short fibers, 200kg of chemical mechanical fibers and 9.5kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.15kg of direct yellow 147 pigment and 0.15kg of direct yellow 11 pigment, 0.28kg of cationic polyacrylamide and 0.28kg of anionic polyacrylamide, 2.8kg of bentonite, 260kg of calcium carbonate and 1.0kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Example eight
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 130kg of high-whiteness long fibers, 700kg of low-bleaching short fibers, 170kg of chemical mechanical fibers and 8kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.18kg of direct yellow 147 pigment and 0.18kg of direct yellow 11 pigment, 0.27kg of cationic polyacrylamide and 0.27kg of anionic polyacrylamide, 2.8kg of bentonite, 262kg of calcium carbonate and 1.2kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Example nine
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: weighing 180kg of high-whiteness long fibers, 660kg of low-bleaching short fibers, 160kg of chemical mechanical fibers and 8kg of cationic starch, and uniformly mixing to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.2kg of direct yellow 147 pigment and 0.2kg of direct yellow 11 pigment, 0.27kg of cationic polyacrylamide and 0.27kg of anionic polyacrylamide, 2.8kg of bentonite, 265kg of calcium carbonate and 1.2kg of alkenyl succinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Example ten
The embodiment of the invention provides double-sided offset paper which comprises paper high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers.
The preparation method of the double-sided offset paper provided by the embodiment of the invention comprises the following steps:
step one, preparing first mixed slurry: 170kg of high-whiteness long fibers, 680kg of low-bleaching short fibers, 150kg of chemical mechanical fibers and 7.5kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.2kg of direct yellow 147 pigment and 0.2kg of direct yellow 11 pigment, 0.3kg of cationic polyacrylamide and 0.3kg of anionic polyacrylamide, 3kg of bentonite, 270kg of calcium carbonate and 1.2kg of alkenylsuccinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Comparative example 1
Comparative example of the present invention provides a double-offset paper, which does not include the yellow pigment of the example of the present invention.
Step one, preparing first mixed slurry: 150kg of high-whiteness long fiber, 700kg of low-bleaching short fiber, 150kg of chemical mechanical fiber and 7.5kg of cationic starch are weighed and uniformly mixed to obtain first mixed pulp.
Step two, preparing second mixed slurry: to the first mixed slurry were added 0.3kg of cationic polyacrylamide and 0.3kg of anionic polyacrylamide, 3kg of bentonite and 1.5kg of alkenylsuccinic anhydride to obtain a second mixed slurry.
Step three, preparing the double-sided offset paper: and drying and calendaring the second mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Comparative example No. two
Comparative examples of the present invention provide a high whiteness double offset paper comprising long high whiteness fibers, excluding short low bleaching fibers, chemi-mechanical fibers, and yellow pigments according to examples of the present invention.
Step one, preparing mixed slurry: weighing 1 ton of high-whiteness long fiber, 0.3kg of cationic polyacrylamide, 0.3kg of anionic polyacrylamide, 3kg of bentonite and 1.5kg of alkenyl succinic anhydride, and uniformly mixing to obtain mixed slurry.
Step two, preparing double-sided offset paper: and drying and calendaring the mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
Comparative example No. three
The comparative example of the invention provides a two-side offset paper, which does not comprise the yellow pigment of the example of the invention and is added with a fluorescent whitening agent.
Step one, preparing mixed slurry: weighing 1 ton of high-whiteness long fiber, 0.3kg of cationic polyacrylamide, 0.3kg of anionic polyacrylamide, 3kg of bentonite, 1.5kg of alkenyl succinic anhydride and 0.1kg of disulfonic acid, and uniformly mixing to obtain mixed slurry.
Step two, preparing double-sided offset paper: and drying and calendaring the mixed pulp to obtain the double-sided offset paper. And detecting the double-sided offset paper by using a color difference meter to obtain an L value, an a value and a b value, then calculating the hue and CIE whiteness of the double-sided offset paper, and detecting the fluorescence value of the double-sided offset paper by using a fluorescence tester.
The present inventors tested data on double-offset papers prepared in examples and comparative examples, wherein yellow pigments were added during the preparation in all of examples one to ten, and the yellow pigments in the examples of the present invention were not contained in comparative example one compared with the examples of the present invention. Comparative example two the low bleached staple fibers, chemi-mechanical pulp fibers, and yellow pigment of the inventive examples were not included as compared to the inventive examples. Comparative example three compared to the inventive example, the inventive example did not contain the yellow pigment and a fluorescent whitening agent was added. The test results of the examples of the present invention and the comparative examples are as follows:
as can be seen from the above table, the double-sided offset papers prepared in the first to the tenth examples of the present invention all contain a yellow pigment during the preparation process, and the color difference of the double-sided offset paper of the first example of the present invention is smaller than that of the first comparative example, which does not contain the yellow pigment of the first example of the present invention but contains the high-whiteness long fiber, the low-bleaching short fiber and the chemi-mechanical fiber of the present application. Comparative example two does not contain the low-bleached staple fibers and the chemimechanical fibers of the example of the present invention, and the yellow pigment, compared to the example of the present invention, and the hue difference of comparative example two is not only larger than that of the example of the present invention, but also larger than that of comparative example one. Compared with the third embodiment of the invention, the double-sided offset paper of the third embodiment of the invention does not contain the yellow pigment of the third embodiment of the invention and is added with the fluorescent whitening agent, the chromatic aberration of the double-sided offset paper of the third embodiment of the invention is smaller than that of the third embodiment of the invention, and the fluorescence value of the third embodiment of the invention is far larger than that of the third embodiment of the invention. Therefore, the double-sided offset paper prepared in the first to tenth embodiments of the invention can effectively improve the color stability and reduce the cost by adding the yellow pigment in the preparation process, and can reduce the environmental pollution without adding the fluorescent whitening agent in the preparation process.
While the foregoing is directed to embodiments of the present invention, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A double-sided offset paper, characterized in that the CIE whiteness of the double-sided offset paper is 28% -38%, the double-sided offset paper comprises: high-whiteness long fibers, low-bleaching short fibers, chemical mechanical fibers, cationic starch and yellow pigments dispersed in the high-whiteness long fibers, the low-bleaching short fibers and the chemical mechanical fibers, wherein the yellow pigments comprise direct yellow 147 pigments and direct yellow 11 pigments.
2. The offset paper according to claim 1, wherein the offset paper has a fluorescence value of not higher than 0.8, an L value of 94.0 to 95.0, an a value of-0.8 to-1.3, and a b value of 11.6 to 12.6.
3. The offset paper of claim 1, wherein the direct yellow 147 pigment and the direct yellow 11 pigment are contained in an amount of 150g to 250g per ton of the offset paper based on the mass of the yellow pigment per ton of the offset paper.
4. The double-sided offset paper according to any one of claims 1 to 3, wherein the high-whiteness long fibers have a length of 2.0 to 2.5mm, and the low-whiteness short fibers have a length of 0.6 to 0.8 mm.
5. A method for preparing the double-sided offset paper according to any one of claims 1 to 4, comprising:
uniformly mixing high-whiteness long fiber pulp, low-bleaching short fiber pulp, chemical mechanical fiber pulp and cationic starch to obtain first mixed pulp;
adding a yellow pigment into the first mixed slurry to obtain second mixed slurry;
and manufacturing the second mixed pulp into double-sided offset paper.
6. The method for preparing the double-coated paper according to claim 5, wherein when the yellow pigment is added to the first mixed pulp in the form of a solution, the mass concentration of the solution formed by the direct yellow 147 pigment is 0.5-1.0%, and the mass concentration of the solution formed by the direct yellow 11 pigment is 0.5-1.0%;
according to the mass of the cationic starch contained in each ton of the double-sided offset paper, the mass of the cationic starch contained in each ton of the double-sided offset paper is 7 kg-10 kg.
7. The method for preparing the double-sided offset paper according to claim 5, wherein the mass ratio of the high-whiteness long fiber pulp to the low-bleaching short fiber pulp to the chemi-mechanical fiber pulp is (10-20): (65-70): (10-20).
8. The method of claim 5, wherein the high-whiteness long fiber pulp has an ISO brightness of 89-90%, the low-bleached short fiber pulp has an ISO brightness of 75-85%, and the chemi-mechanical fiber pulp has an ISO brightness of 79-83%.
9. The method of making a double-offset paper according to claim 5, wherein the method of making the low-bleached short fiber slurry comprises:
the short fiber wood chips are subjected to a cooking process, a washing process and an oxygen delignification process in sequence to obtain short fiber slurry;
and bleaching the short fiber pulp in sequence through a bleaching process to obtain low-bleaching short fiber pulp, wherein the bleaching process comprises a chlorine dioxide first-stage bleaching process, an oxygen bleaching process, a hydrogen peroxide bleaching process, a chlorine dioxide second-stage bleaching process and a chlorine dioxide third-stage bleaching process.
10. The method for preparing the double-sided offset paper according to claim 9, wherein the bleaching agent used in the bleaching process comprises chlorine dioxide, oxygen bleaching agent and hydrogen peroxide; the mass of the bleaching agent contained in each ton of low-bleaching short fiber pulp is 15 kg-20 kg according to the mass of the bleaching agent contained in each ton of low-bleaching short fiber pulp.
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|---|---|---|---|---|
| SU1567711A1 (en) * | 1988-07-20 | 1990-05-30 | Центральный научно-исследовательский институт бумаги | Method of preparing paper pulp for manufacturing paper for print duplication paper |
| CN101691702A (en) * | 2009-10-14 | 2010-04-07 | 福建省晋江优兰发纸业有限公司 | High thickness beige electrostatic copying paper and production method thereof |
| CN111188224A (en) * | 2020-01-03 | 2020-05-22 | 山东太阳纸业股份有限公司 | Myopia-preventing paper and preparation method thereof |
| CN113981739A (en) * | 2021-11-12 | 2022-01-28 | 亚太森博(广东)纸业有限公司 | Low-whiteness double-sided offset paper preparation process, production method of paper and low-whiteness double-sided offset paper |
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2022
- 2022-07-07 CN CN202210802843.8A patent/CN115012250A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1567711A1 (en) * | 1988-07-20 | 1990-05-30 | Центральный научно-исследовательский институт бумаги | Method of preparing paper pulp for manufacturing paper for print duplication paper |
| CN101691702A (en) * | 2009-10-14 | 2010-04-07 | 福建省晋江优兰发纸业有限公司 | High thickness beige electrostatic copying paper and production method thereof |
| CN111188224A (en) * | 2020-01-03 | 2020-05-22 | 山东太阳纸业股份有限公司 | Myopia-preventing paper and preparation method thereof |
| CN113981739A (en) * | 2021-11-12 | 2022-01-28 | 亚太森博(广东)纸业有限公司 | Low-whiteness double-sided offset paper preparation process, production method of paper and low-whiteness double-sided offset paper |
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