CN117845657A - Composite paperboard and preparation method thereof - Google Patents
Composite paperboard and preparation method thereof Download PDFInfo
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- CN117845657A CN117845657A CN202311864648.9A CN202311864648A CN117845657A CN 117845657 A CN117845657 A CN 117845657A CN 202311864648 A CN202311864648 A CN 202311864648A CN 117845657 A CN117845657 A CN 117845657A
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- 239000011087 paperboard Substances 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 75
- 239000011121 hardwood Substances 0.000 claims abstract description 71
- 239000010410 layer Substances 0.000 claims abstract description 52
- 239000012792 core layer Substances 0.000 claims abstract description 49
- 239000002344 surface layer Substances 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 238000013329 compounding Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 32
- 229920002472 Starch Polymers 0.000 claims description 19
- 235000019698 starch Nutrition 0.000 claims description 19
- 239000008107 starch Substances 0.000 claims description 19
- 239000002655 kraft paper Substances 0.000 claims description 15
- 239000011122 softwood Substances 0.000 claims description 12
- 229920001131 Pulp (paper) Polymers 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 239000000123 paper Substances 0.000 abstract description 36
- 239000011229 interlayer Substances 0.000 abstract description 10
- 239000011230 binding agent Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 58
- 238000005507 spraying Methods 0.000 description 9
- 238000007639 printing Methods 0.000 description 7
- 238000004513 sizing Methods 0.000 description 5
- 206010061592 cardiac fibrillation Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002600 fibrillogenic effect Effects 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 241000220479 Acacia Species 0.000 description 3
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000218631 Coniferophyta Species 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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Abstract
The invention provides a preparation method of a composite paperboard, which comprises the following steps: obtaining surface layer slurry, core layer slurry and bottom layer slurry; preparing a surface layer, a core layer and a bottom layer from the surface layer slurry, the core layer slurry and the bottom layer slurry respectively; sequentially stacking the surface layer, the core layer and the bottom layer together, and tightly compounding the surface layer, the core layer and the bottom layer by vacuum suction to form a compound paperboard; wherein, the surface layer pulp and the core layer pulp both comprise first bleached sulfate hardwood pulp and second bleached sulfate hardwood pulp, and the freeness of the first bleached sulfate hardwood pulp is greater than that of the second bleached sulfate hardwood pulp. According to the preparation method provided by the invention, the second bleached sulfate hardwood pulp with low freeness is added into the surface layer and the core layer, so that the interlayer bonding strength of the multi-layer paperboard is effectively improved, the use of an interlayer binder can be eliminated, the running stability of the paper machine is improved, and the speed of the paper machine is increased.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a composite paperboard and a preparation method thereof.
Background
As the printing speed and printing requirements of the printing machine increase, higher requirements are put on the bonding strength (intemal bond strength scott bond, Z-direction strength) between the layers of the coated white board. The bonding strength between the layers of the paper board is improved, and the phenomenon of foaming separation layer in the printing process, especially in the field large ink position printing process, is suitable for the requirement of high-speed printing of a printer, and also reduces the requirement of paper breaking caused by foaming separation layer of the paper board in the paper machine production process. Therefore, how to improve the interlayer bonding strength of the coated white cardboard is a problem which is very concerned and needs to be solved in the papermaking industry for many years.
Spraying starch between paperboard plies is currently the primary means of improving the bond strength between paperboard plies. The starch can produce great fog and dust in the spraying process, easily causes the problem that the equipment hangs materials, the excessive accumulation materials drop to the paper web, cause paper web hole, broken edge and even broken paper, seriously influence the production of the paper web and the quality of the paper web. And meanwhile, the use of the starch spraying process can limit the improvement of the speed of the paper machine.
Disclosure of Invention
In one aspect, the embodiment of the invention provides a method for preparing a composite paperboard, which comprises the following steps:
obtaining surface layer slurry, core layer slurry and bottom layer slurry;
preparing a surface layer, a core layer and a bottom layer from the surface layer slurry, the core layer slurry and the bottom layer slurry respectively;
sequentially stacking the surface layer, the core layer and the bottom layer together, and tightly compounding the surface layer, the core layer and the bottom layer by vacuum suction to form the composite paperboard;
the surface layer pulp and the core layer pulp comprise first bleached sulfate hardwood pulp and second bleached sulfate hardwood pulp, and the freeness of the first bleached sulfate hardwood pulp is greater than that of the second bleached sulfate hardwood pulp.
According to an embodiment of the present application, the surface layer, the core layer and the bottom layer are sequentially stacked together, and in the step of tightly compounding the surface layer, the core layer and the bottom layer by vacuum suction, no spraying starch is provided between the surface layer and the core layer.
According to an embodiment of the present application, the freeness of the first bleached sulfate hardwood pulp is 380ml-400ml, and the freeness of the second bleached sulfate hardwood pulp is 100ml-130ml.
According to one embodiment of the present application, the second bleached sulfate hardwood pulp has a fines content ranging from 4.3% to 4.6%.
According to an embodiment of the present application, the second bleached sulfate hardwood pulp is Jin Haishi pulp as a raw material.
According to an embodiment of the present application, the second bleached sulfate hardwood pulp comprises 20% -30% by mass of the facer pulp.
According to an embodiment of the present application, the second bleached sulfate hardwood pulp comprises 5% -10% by mass of the core layer slurry.
According to an embodiment of the present application, the facing stock further includes bleached sulfate softwood pulp, the bleached sulfate softwood pulp accounts for 30% -40% of the mass of the facing stock, and the first bleached sulfate hardwood pulp accounts for 30% -40% of the mass of the facing stock.
According to an embodiment of the present application, the core pulp further includes bleached chemi-thermomechanical pulp and broke, wherein the bleached chemi-thermomechanical pulp accounts for 65% -75% of the core pulp by mass, the broke accounts for 15% -20% of the core pulp by mass, and the first bleached sulfate hardwood pulp accounts for 5% -15% of the core pulp by mass.
In addition, the embodiment of the application also provides a composite paperboard, which is prepared by adopting the preparation method of any one of the embodiments.
According to the composite paperboard and the preparation method thereof, the second bleached sulfate hardwood pulp with low freeness is added into the surface layer and the core layer, so that the interlayer bonding strength of the multi-layer paperboard is effectively improved, the use of an interlayer binder can be eliminated, the running stability of a paper machine is improved, and the speed of the paper machine is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of an embodiment of a method of preparation of the present application;
fig. 2 is a schematic structural view of an embodiment of the composite paperboard of the present application.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Likewise, the following examples are only some, but not all, of the examples of the present invention, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present invention.
The terms "first," "second," "third," and the like in the embodiments of the present application 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 defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1 and 2, fig. 1 is a schematic flow chart of an embodiment of the preparation method of the present application, and fig. 2 is a schematic structural diagram of an embodiment of the composite paperboard of the present application. The preparation method comprises the following steps:
step S100: obtaining surface layer slurry, core layer slurry and bottom layer slurry;
step S200: the surface layer 110, the core layer 120 and the bottom layer 130 are respectively prepared from surface layer slurry, core layer slurry and bottom layer slurry;
step S300: sequentially stacking the surface layer 110, the core layer 120 and the bottom layer 130 together, and tightly compounding the surface layer 110, the core layer 120 and the bottom layer 130 by vacuum suction to form a composite paperboard 10;
wherein the surface layer pulp and the core layer pulp both comprise first bleached sulfate hardwood pulp (LBKP 1) and second bleached sulfate hardwood pulp (LBKP 2), and the freeness of the first bleached sulfate hardwood pulp is greater than that of the second bleached sulfate hardwood pulp. The surface layer 110 and the core layer 120 are directly compounded through vacuum suction, so that the use of an interlayer adhesive is eliminated, the running stability of the paper machine is improved, and the speed of the paper machine is improved.
Optionally, in step S300, no starch is sprayed between the facing 110 and the core 120, but is directly compounded by vacuum suction.
Alternatively, the first bleached sulfate hardwood pulp and the second bleached sulfate hardwood pulp may be made by pulping bleached sulfate hardwood pulp (LBKP) to different degrees. Bleached sulfate hardwood pulp is one kind of chemical pulp produced with hardwood as material and through sulfate process and may be used alone or in combination with bleached needle pulp in making various kinds of printing paper. By adjusting the pulping process, the bleached sulfate hardwood pulp is refined, so that the freeness, the fine fiber content and other indexes of the second bleached sulfate hardwood pulp reach a certain level, and the bonding strength between the layers of the multilayer paperboard can be effectively improved on the premise of canceling spraying starch.
Further, the second bleached sulfate hardwood pulp was Jin Haishi pulp as a starting material. The principle of refining enhancement refers to the fibrillation of its individual fibers by mechanical action. The fiber splitting and brooming effect means that the fibers are split and broomed at two ends in the longitudinal direction, and the fiber surface is split and fluffed like fluff attached to the surface of the fibers. The surface fibrillation releases the fine fibers, separates a large number of fine fibers and microfibers, increases the specific surface area outside the fibers, and promotes hydrogen bonding. The fibers of the split yarns are not separated from the main fibers as much as possible, so that a large number of falling-off and a large number of fiber fragments are avoided, other fibers are intertwined and combined through the split yarns, the interweaving among the fibers is improved, and the fiber strength is improved. The existing bleached sulfate hardwood pulp comprises Jin Haishi pulp, acacia pulp, high-dendric pulp and other pulp. Since the content of fine fibers in the high-wet pulp reaches 12% -13%, the fibers themselves have more fiber fragments, and the fiber fragments cannot provide strength. If the fibers of the high-wet pulp are excessively ground, fiber fragments accumulate too much to remain in the pulp, and the strength is rather lowered. Thus high-wet-on pulp cannot be used as a fine pulp raw material. The fine fiber content of the Jin Haishi pulp and the acacia pulp is equivalent to 2.5-3.0%. But the fiber width of the acacia pulp is 15um-16um, the width of the Jin Haishi pulp can reach 16.5um-17.5um, and the wider fibers can be better separated in the pulp grinding process, so that the fiber strength is improved more. Therefore, the gold sea wet pulp can be refined and used as the raw material of the second bleached sulfate hardwood pulp.
Alternatively, the freeness of the first bleached sulfate hardwood pulp is 380ml to 400ml and the freeness of the second bleached sulfate hardwood pulp is 100ml to 130ml. Specifically, the freeness of the first bleached sulfate hardwood pulp may be 380ml, 385, 390ml, 400ml, and any number therebetween. The freeness of the second bleached sulfate hardwood pulp may be 100ml, 105ml, 110ml, 120ml, 130ml, and any number therebetween.
Further, the freeness of the second bleached sulfate hardwood pulp can be controlled through a fine grinding process, and a laboratory test shows that the second bleached sulfate hardwood pulp with the freeness of 100ml-130ml can be obtained. When the freeness of the second bleached sulfate hardwood pulp is higher than 130ml, the water absorption swelling and the fibrillation of the fiber do not reach the peak value yet, and a rising space is still reserved; when the freeness of the second bleached sulfate hardwood pulp is lower than 100ml, on one hand, the average length of the fibers is reduced, the fiber breaking length starts to be reduced, and on the other hand, the freeness is too low, so that the fibrillated fine fibers fall off from the main fibers and are dissociated in water, the interweaving with other fibers is reduced, and the bonding strength of the fibers is reduced.
Optionally, the second bleached sulfate hardwood pulp has a fines content ranging from 4.3% to 4.6%. The fine fibers generated in the pulping process of the second bleached sulfate hardwood pulp can be filled in the fiber interweaving layer, so that the bonding strength of the fibers is improved. However, too much fines freeness in water will affect the drainage properties of the pulp while reducing the paper strength, and therefore the fines content of the second bleached kraft pulp is controlled to be in the range of 4.3% -4.6%.
Optionally, the second bleached kraft pulp has a tensile index of 65-75Nm/g, a folding endurance of 600-700 times, and a cohesion of 650-750J/m 2 . Further, the tensile index and cohesive strength of the second bleached kraft hardwood pulp are comparable to those of the currently bleached kraft softwood pulp.
Optionally, the second bleached sulfate hardwood pulp comprises 20% -30%, e.g., 20%, 25%, 28%, 30%, etc., of the mass of the top layer slurry. The mass ratio of the second bleached sulfate hardwood pulp in the surface layer slurry needs to be controlled within 30%, if the mass ratio is more than 30%, the fibers of the surface layer 110 are tightly interwoven, the fiber gaps are reduced, and when a surface sizing process (the surface sizing starch can improve the paper strength) is carried out, the penetration of the paper surface sizing starch into the fibers is poor, so that the paper strength is poor.
Optionally, the second bleached sulfate hardwood pulp comprises 5% -10%, e.g., 5%, 6%, 8%, 10%, etc., of the mass of the core pulp.
Optionally, the surface layer pulp further comprises bleached sulfate softwood pulp (NBKP), wherein the bleached sulfate softwood pulp is chemical pulp prepared by taking softwood as a raw material and adopting a sulfate method for steaming and bleaching. Bleached kraft softwood pulp is the "pulp king" which is the most widely used pulp and can produce almost all paper types, with the exception of special varieties, depending on the different conifer trees, cooking bleaching processes and operating conditions. Bleached kraft softwood pulp accounts for 30% -40% of the mass of the top layer pulp, such as 30%, 35%, 38%, 40%, etc. The first bleached sulfate hardwood pulp comprises 30% -40% of the top layer pulp by mass, for example 30%, 32%, 35%, 40% and the like.
Further, the core pulp also includes bleached chemi-thermomechanical pulp (chemi-mechanical pulp) and broke, the bleached chemi-thermomechanical pulp accounting for 65% -75%, e.g., 65%, 67%, 70%, 75%, etc., of the mass of the core pulp. The broke comprises 15-20% of the core pulp by mass, e.g. 15%, 16%, 18%, 20% etc. The first bleached sulfate hardwood pulp comprises 5% -15%, e.g., 5%, 8%, 10%, 15%, etc., of the mass of the core pulp.
Alternatively, the bottom layer 130 is made from a bottom layer slurry that includes 30% -40% bleached sulfate softwood pulp by mass and 60% -70% first bleached sulfate hardwood pulp by mass. Specifically, the mass ratio of bleached kraft softwood pulp to the underlying pulp can be 30%, 35%, 37%, 40%, etc. values. The mass ratio of the first bleached sulfate hardwood pulp to the underlying pulp may be 60%, 62%, 65%, 70%, etc. The bottom layer 130 and the core layer 120 are positioned at the bottom of the paperboard 10, and in the process of compounding the paperboard 10, compared with the surface layer 110 and the core layer 120, the vacuum suction effect between the bottom layer 130 and the core layer 120 is better, and the bonding is tighter, so that the bonding strength between the bottom layer 130 and the core layer 120 is improved without spraying starch.
In addition, an embodiment of the present application further provides a composite board 10, as shown in fig. 2, where the composite board 10 is manufactured by using the manufacturing method in the foregoing embodiment, and the composite board 10 includes a surface layer 110, a core layer 120, and a bottom layer 130 that are sequentially stacked.
In the prior art, the surface layer 110 and the core layer 120 can improve the bonding strength of the layers by spraying starch, so that the problem of layering of paper in the post-processing process is avoided. However, the speed of the paper machine can be improved by using the sprayed starch, and meanwhile, if the sprayed starch is improperly stored, microorganisms are easy to breed, and paper diseases such as holes and the like can be generated when the sprayed starch is sprayed on paper. According to the method, the second bleached sulfate hardwood pulp is added to both the surface layer 110 and the core layer 120, more fine fibers in the surface layer 110 and the fine fibers in the core layer 120 are combined in the compounding process, and are subjected to vacuum suction through the net part, so that the interweaving and combination of the fibers between the layers are tighter in the thickness direction (Z direction) of the paper, and the strength between the layers, namely the interlayer combination strength of the paper, can be remarkably improved. Therefore, the second bleached sulfate hardwood pulp is used in the surface layer 110 and the core layer 120, so that the use of spraying starch can be omitted under the condition of improving the paper strength, and conditions are provided for the subsequent speed improvement. As can be seen from Table 1, after the second bleached sulfate hardwood pulp is used for the surface layer 110 and the core layer 120, the spraying starch between the surface layer 110 and the core layer 120 is removed, the offset printing property RI (TV 16) of the paper is improved from 2.0 times to 2.5 times, and the interlayer bonding strength is improved from 213J/m 2 Lifting to 244J/m 2 。
TABLE 1 influence of second bleached sulfate hardwood pulp on paper strength
As can be seen from Table 1, after the surface layer 110 uses 30% by mass of the second bleached sulfate hardwood pulp and the core layer 120 uses 5% by mass of the second bleached sulfate hardwood pulp, the interlayer bonding strength and offset performance of the finished paper are improved. Mainly because the freeness of the second bleached sulfate hardwood pulp is between 100ml and 130ml, the fiber length can be well reserved in the pulping process, and the fiber is biased to be mainly formed by surface fine fiber and longitudinal tearing, so that the mutually interwoven network of the fiber is more compact, the fuzzing activation degree of the fiber is higher, the content of fine fiber is increased, the fiber thickness is reduced, and the relative bonding area is increased. Particularly in the multilayer papermaking, more fine fibers in the surface layer 110 and the core layer 120 are combined with fine fibers in the core layer in the compounding process, and the fibers are subjected to vacuum suction through the net part, so that the Z-direction interweaving and combination of the fibers between the layers are tighter, and the combination strength between the layers can be remarkably improved. However, when too much second bleached sulfate hardwood pulp is added to the top layer 110, the paper strength is reduced.
Table 2 effect of surface sizing penetration using second bleached sulfate hardwood pulp on surface layer
As can be seen from table 2, the addition of too much second bleached sulfate hardwood pulp to the top layer 110 makes the fibers tightly entangled, the fiber voids become smaller, and the penetration of the surface sizing starch into the fibers becomes worse, which results in the deterioration of the paper strength. Therefore, the usage proportion of the second bleached sulfate hardwood pulp in the surface layer 110 is 20% -30%, and the proportion of the second bleached sulfate hardwood pulp in the core layer 120 is 5-10%, so that the paper strength can be effectively improved.
According to the composite paperboard 10 provided by the invention, through adding the second bleached sulfate hardwood pulp into the pulp, the proper freeness, the fine fiber content and the fibrillation effect of the second bleached sulfate hardwood pulp can not only effectively increase the binding force between fibers in the horizontal direction, but also effectively improve the interlayer binding strength of the multilayer paperboard by combining the fibers in the Z direction between the layers through vacuum suction during the lamination of the multilayer paperboard, so that the use of spray starch can be canceled, the paper diseases caused by the use of the spray starch can be reduced, the running performance of a paper machine can be improved, and the speed of the paper machine can be improved.
The foregoing description is only a partial embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A method of making a composite paperboard, the method comprising:
obtaining surface layer slurry, core layer slurry and bottom layer slurry;
preparing a surface layer, a core layer and a bottom layer from the surface layer slurry, the core layer slurry and the bottom layer slurry respectively;
sequentially stacking the surface layer, the core layer and the bottom layer together, and tightly compounding the surface layer, the core layer and the bottom layer by vacuum suction to form the composite paperboard;
the surface layer pulp and the core layer pulp comprise first bleached sulfate hardwood pulp and second bleached sulfate hardwood pulp, and the freeness of the first bleached sulfate hardwood pulp is greater than that of the second bleached sulfate hardwood pulp.
2. The method according to claim 1, wherein the surface layer, the core layer and the bottom layer are sequentially laminated together, and no starch is sprayed between the surface layer and the core layer in the step of tightly compounding the surface layer, the core layer and the bottom layer by vacuum suction.
3. The method of claim 1, wherein the first bleached kraft pulp has a freeness of 380ml to 400ml and the second bleached kraft pulp has a freeness of 100ml to 130ml.
4. The method of claim 1, wherein the second bleached kraft pulp has a fines content ranging from 4.3% to 4.6%.
5. The method of claim 1, wherein the second bleached kraft pulp is Jin Haishi pulp as a raw material.
6. The method of claim 1, wherein the second bleached sulfate hardwood pulp comprises 20% -30% of the facer pulp by mass.
7. The method of claim 1, wherein the second bleached sulfate hardwood pulp comprises 5% -10% by mass of the core pulp.
8. The method of making according to claim 6, wherein the top layer slurry further comprises bleached kraft softwood pulp, the bleached kraft softwood pulp comprises 30% to 40% by mass of the top layer slurry, and the first bleached kraft hardwood pulp comprises 30% to 40% by mass of the top layer slurry.
9. The method of making according to claim 7, wherein the core pulp further comprises bleached chemi-thermomechanical pulp and broke, the bleached chemi-thermomechanical pulp comprising 65% to 75% by mass of the core pulp, the broke comprising 15% to 20% by mass of the core pulp, and the first bleached kraft pulp comprising 5% to 15% by mass of the core pulp.
10. A composite board, characterized in that it is produced by the production method according to any one of claims 1 to 9.
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| CN202311864648.9A CN117845657A (en) | 2023-12-29 | 2023-12-29 | Composite paperboard and preparation method thereof |
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| CN202311864648.9A CN117845657A (en) | 2023-12-29 | 2023-12-29 | Composite paperboard and preparation method thereof |
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