CN111235940A - Preparation method of core layer slurry, base paper, paperboard and paper machine - Google Patents
Preparation method of core layer slurry, base paper, paperboard and paper machine Download PDFInfo
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- CN111235940A CN111235940A CN202010038089.6A CN202010038089A CN111235940A CN 111235940 A CN111235940 A CN 111235940A CN 202010038089 A CN202010038089 A CN 202010038089A CN 111235940 A CN111235940 A CN 111235940A
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- pulp
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- 239000012792 core layer Substances 0.000 title claims abstract description 83
- 239000000123 paper Substances 0.000 title claims abstract description 79
- 239000002002 slurry Substances 0.000 title claims abstract description 48
- 239000011087 paperboard Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000004061 bleaching Methods 0.000 claims abstract 3
- 238000004513 sizing Methods 0.000 claims description 50
- 239000002344 surface layer Substances 0.000 claims description 25
- 239000010410 layer Substances 0.000 claims description 22
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 239000011121 hardwood Substances 0.000 claims description 13
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 12
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 12
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 12
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 229920002472 Starch Polymers 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 235000019698 starch Nutrition 0.000 claims description 9
- 239000008107 starch Substances 0.000 claims description 9
- 125000002091 cationic group Chemical group 0.000 claims description 7
- 239000011122 softwood Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000003490 calendering Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002352 surface water Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 2
- 235000011128 aluminium sulphate Nutrition 0.000 claims 1
- 239000001164 aluminium sulphate Substances 0.000 claims 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 7
- 239000003814 drug Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 239000011111 cardboard Substances 0.000 description 5
- 238000004043 dyeing Methods 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- 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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/62—Rosin; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
The application discloses a preparation method of core layer slurry, base paper, paperboard and a paper machine, wherein the core layer slurry comprises bleached chemithermomechanical pulp; the bleached chemithermomechanical pulp accounts for at least 65% of the mass ratio of the core layer pulp, so that the bulk of paper made of the core layer pulp is larger than 1.8. In this way, the application provides a core layer slurry, including bleaching chemical thermomechanical pulp in this core layer slurry, and bleaching chemical thermomechanical pulp accounts for 65% of the mass ratio of core layer slurry, and then can make the bulk of the paper of adopting this core layer slurry preparation be greater than 1.8, can satisfy the processing technology demand of paper.
Description
Technical Field
The application relates to the technical field of paper, in particular to a preparation method of core layer pulp, base paper, paperboard and a paper machine.
Background
Generally, the bulk of a paper sheet is an index indicating the degree of density of the paper sheet, i.e., the volume of a certain weight of the paper sheet, and is numerically the reciprocal of the degree of tightness. To the card paper of preparation paper cup, this type of card paper all is very high to the bulk and the deflection requirement of paper, and the deflection of paper directly influences the deflection sense after the preparation shaping.
Generally, the higher the bulk, the higher the stiffness of the paper and the more difficult the processing of the paper. The bulk of the commonly used paperboard can reach 1.50-1.75g/cm3, but if the bulk is increased, the proportioning of the paper pulp raw materials in the paper making process is improved, the current pulp proportioning scheme is difficult to achieve higher bulk and meet the processing technology requirements of subsequent mounting and light color printing or dyeing.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a preparation method of core layer pulp, base paper, paperboard and a paper machine, which can improve the bulk of paper and meet the processing technology requirements of subsequent paper on mounting and light color printing or dyeing.
In order to solve the technical problem, the application adopts a technical scheme that: providing a core layer slurry, wherein the core layer slurry comprises bleached chemithermomechanical pulp; the bleached chemithermomechanical pulp accounts for at least 65% of the mass ratio of the core layer pulp, so that the bulk of paper made of the core layer pulp is larger than 1.8.
In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a method for producing a base paper, which comprises: providing surface layer slurry, bottom layer slurry and the core layer slurry provided by the technical scheme;
adding rosin glue and aluminum sulfate solution into the surface layer slurry, the bottom layer slurry and the core layer slurry respectively to carry out internal sizing;
and respectively conveying the surface layer slurry, the bottom layer slurry and the core layer slurry to a surface net, a bottom net and a core net for papermaking, squeezing and drying to obtain the base paper.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a method for producing a paperboard, the method comprising:
providing base paper and sizing material, wherein the base paper is prepared by the preparation method of the base paper;
coating sizing materials on the surface of the base paper for surface sizing;
and drying and calendering the base paper after surface sizing is finished to obtain the paperboard.
In order to solve the above technical problem, another technical solution adopted by the present application is: provides a paperboard which is prepared by the preparation method.
In order to solve the above technical problem, another technical solution adopted by the present application is: a paper machine is provided for producing the above mentioned cardboard.
The beneficial effect of this application is: the core layer pulp comprises bleached chemical thermomechanical pulp, the mass ratio of the bleached chemical thermomechanical pulp to the core layer pulp is 65%, so that the bulk of paper made of the core layer pulp is larger than 1.8, and the processing technology requirements of subsequent paper for mounting and light-color printing or dyeing can be met.
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of a process for making base paper according to the present application;
fig. 2 is a schematic flow diagram of an embodiment of the method for preparing paperboard according to the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the application provides a core layer slurry, which includes bleached chemithermomechanical pulp, wherein the bleached chemithermomechanical pulp accounts for at least 65% of the core layer slurry by mass, so as to ensure that the bulk of paper made of the core layer slurry is greater than 1.8.
The core layer pulp also comprises broke pulp, bleached sulfate hardwood pulp and bleached sulfate softwood pulp, the mass ratio of the bleached chemithermomechanical pulp to the core layer pulp is 65-85%, the core layer fiber structure is optimized by increasing the using amount of the bleached chemithermomechanical pulp, and the bulk of subsequently prepared paper is ensured to reach 1.95-2.0; the mass ratio of the damaged paper pulp to the core layer pulp is 10-30%; the mass ratio of the bleached sulfate hardwood pulp to the core layer pulp is 0-10%, the length of the fibers of the bleached sulfate hardwood pulp is longer, the fibers are broomed well, the binding capacity is strong, the bleached sulfate hardwood pulp can play a role similar to a support net when being combined with mechanical pulp, and the interlayer binding strength of paper can be improved; the mass ratio of the bleached sulfate softwood pulp to the core layer pulp is 0-3%.
Specifically, the mass ratio of the bleached chemithermomechanical pulp to the core layer pulp can be 65%, 70%, 75% and 85%;
the mass ratio of the damaged paper pulp to the core layer pulp can be 10%, 15%, 20%, 25% and 30%;
the mass ratio of the bleached sulfate hardwood pulp to the core layer pulp can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% and 10%.
The mass ratio of the bleached sulfate softwood pulp to the core layer pulp can be 0%, 1%, 2% and 3%.
The mass ratio of the bleached chemithermomechanical pulp and the broke pulp in the core layer pulp is further at least 85%. In one embodiment of the present application, the bleached chemithermomechanical pulp and the broke pulp comprise 85% to 95% by mass of the core layer pulp.
Specifically, the mass ratio of the bleached chemithermomechanical pulp and the broke pulp may be 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95% of the core layer pulp.
The core layer pulp also comprises a core layer reinforcing medicine, the core layer reinforcing medicine is preferably cationic starch, and the core layer reinforcing medicine is used for being matched with bleached sulfate hardwood pulp to improve the bonding strength between paper layers and ensure the demand of subsequent paper on the mounting process indexes. Wherein the adding amount of the cationic starch is 10-20kg per ton of pulp.
Specifically, the cationic starch may be added in an amount of 10 kg/ton pulp, 11 kg/ton pulp, 12 kg/ton pulp, 13 kg/ton pulp, 14 kg/ton pulp, 15 kg/ton pulp, 16 kg/ton pulp, 17 kg/ton pulp, 18 kg/ton pulp, 19 kg/ton pulp, 20 kg/ton pulp.
An embodiment of the present application further provides a preparation method of base paper, including the following steps:
s101: a face layer slurry, a base layer slurry, and a core layer slurry made by the above examples are provided.
Wherein the core layer pulp comprises bleached chemithermomechanical pulp, broke pulp, bleached sulfate hardwood pulp and bleached sulfate softwood pulp. The mass ratio of the bleached chemithermomechanical pulp to the core layer pulp is 65-85%, and the bleached chemithermomechanical pulp optimizes the core layer fiber structure and ensures that the bulk of the subsequently prepared paper can reach 1.95-2.0. The mass ratio of the broken paper pulp to the core layer pulp is 10-30%, and the mass ratio of the bleached chemithermomechanical pulp to the broken paper pulp to the core layer pulp is at least 85%, preferably 85-95%. The mass ratio of the bleached sulfate hardwood pulp to the core layer pulp is 0-10%, the length of the fibers of the bleached sulfate hardwood pulp is longer, the fibers are broomed well, the binding capacity is strong, the bleached sulfate hardwood pulp can play a role similar to a support net when being combined with mechanical pulp, and the interlayer binding strength of paper can be improved; the mass ratio of the bleached sulfate softwood pulp to the core layer pulp is 0-3%, and the core layer pulp is obtained after uniform stirring.
In addition, the core layer pulp also comprises a core layer reinforcing medicine, the core layer reinforcing medicine is preferably cationic starch, and the core layer reinforcing medicine is used for being matched with bleached sulfate hardwood pulp to improve the bonding strength between paper layers and ensure the mounting requirement of subsequent paper. Wherein the adding amount of the cationic starch is 10-20kg per ton of pulp.
And respectively stirring the prepared surface layer slurry, the prepared bottom layer slurry and the prepared core layer slurry uniformly, and waiting for subsequent internal sizing.
S102: adding rosin glue and aluminum sulfate solution into the surface layer slurry, the bottom layer slurry and the core layer slurry respectively to carry out internal sizing.
The paperboard prepared by the embodiment needs to meet the requirement of a subsequent mounting process, the main index is the adhesive absorption property, and the main index is the infiltration and adhesive property of glue during mounting.
Specifically, the surface water absorption value of the cardboard made in this embodiment at 1 minute may be 40gsm, 50gsm, 60gsm, 70gsm, 80gsm, 90gsm, 100gsm, 110gsm, 120 gsm.
Specifically, 3-7 kg/ton pulp (calculated by absolute dry weight) of rosin size is added into the pulp of the core layer; adding 10-20 kg/ton pulp (calculated by absolute dry weight) of aluminum sulfate solution into the core layer pulp, uniformly stirring, and then carrying out internal sizing;
specifically, the amount of the rosin size can be 3kg, 4kg, 5kg, 6kg, 7kg (calculated by absolute dry weight);
the amount of the aluminum sulfate solution may be 10kg, 11kg, 12kg, 13kg, 14kg, 15kg, 16kg, 17kg, 18kg, 19kg, 20kg (in terms of an absolute amount).
Adding 3-7 kg/ton rosin size (calculated by absolute dry weight) into the surface layer sizing agent; adding 0-10 kg/ton pulp (calculated by absolute dry weight) of aluminum sulfate solution into the surface layer pulp to carry out internal sizing;
specifically, the amount of the rosin size can be 3kg, 4kg, 5kg, 6kg, 7kg (calculated by absolute dry weight);
the amount of the aluminum sulfate solution may be 0kg, 1kg, 2kg, 3kg, 4kg, 5kg, 6kg, 7kg, 8kg, 9kg, 10kg (in terms of an absolute amount).
Adding 3-7 kg/ton rosin size (calculated by absolute dry weight) into the bottom layer sizing agent; adding 0-10 kg/ton pulp (calculated by absolute dry weight) of aluminum sulfate solution into the bottom layer pulp, stirring uniformly and then carrying out internal sizing.
Specifically, the amount of the rosin size can be 3kg, 4kg, 5kg, 6kg, 7kg (calculated by absolute dry weight);
the amount of the aluminum sulfate solution may be 0kg, 1kg, 2kg, 3kg, 4kg, 5kg, 6kg, 7kg, 8kg, 9kg, 10kg (in terms of an absolute amount).
S103: and respectively conveying the surface layer slurry, the bottom layer slurry and the core layer slurry to a surface net, a bottom net and a core net for papermaking, squeezing and drying to obtain the base paper.
Specifically, surface layer sizing agent, bottom layer sizing agent and core layer sizing agent which are subjected to internal sizing are respectively fed into a surface layer fourdrinier papermaking machine, a core layer fourdrinier papermaking machine and a bottom layer fourdrinier papermaking machine for compounding, and after compounding, pressing and drying are carried out to obtain base paper.
An embodiment of the present application further provides a preparation method of a paperboard, including the following steps:
s201: there are provided a base paper and a size, the base paper being produced by the method of claim above.
Specifically, the base paper is obtained by respectively feeding surface layer sizing agent, bottom layer sizing agent and core layer sizing agent which are subjected to internal sizing into a surface layer, core layer and bottom layer fourdrinier papermaking machine for compounding, and squeezing and drying after the compounding is finished. The base paper produced by the process has good bulk.
S202: and coating the sizing material on the surface of the base paper for surface sizing.
The sizing material used in the surface sizing process of the embodiment is selected from starch sizing materials and other sizing materials as long as the same sizing effect can be achieved, the starch sizing material is easy to prepare, the economic cost is low, and the index of the sizing process can be met.
Specifically, sizing material is coated on the first surface of base paper, the coating weight is 3g/m2-4.5g/m2, and the solid content of sizing accounts for 16% -24%, so that a first surface layer is formed;
specifically, the first surface layer coat weight may be 3g/m2, 3.5g/m2, 4.0g/m2, 4.5g/m 2;
the first surface layer sizing solids content may be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%.
Coating the sizing material on the second surface of the base paper, wherein the coating weight is 3g/m2-4.5g/m2, and the solid content of sizing accounts for 16% -24%, so as to form a second surface layer;
specifically, the first surface layer coat weight may be 3g/m2, 3.5g/m2, 4.0g/m2, 4.5g/m 2;
the first surface layer sizing solids content may be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%.
Wherein the first surface and the second surface are opposite.
Surface sizing is carried out on the first surface and the second surface of the base paper, the adhesion of the surface layer and the core layer can be obviously improved, and the base paper of the embodiment does not need to be folded, so that the surface base quantification is not high, the surface sizing amount is increased, the penetration degree of sizing materials is increased, and the reinforcing effect is achieved.
S203: and drying and calendaring the base paper subjected to surface sizing to obtain the paperboard.
And carrying out subsequent drying, coating and calendaring treatment on the base paper subjected to surface sizing on a paper machine, and then reeling, rewinding and packaging the paper to obtain the finished paperboard.
The bulk of the paperboard prepared by the embodiment can reach 1.95-2.0g/cm 3.
The cardboard has a bulk of 1.95g/cm3, 1.96g/cm3, 1.97g/cm3, 1.98g/cm3, 1.99g/cm3 and 2.0g/cm 3.
The paperboard prepared according to the embodiment has high stiffness and bulk, and also has certain paper strength, and can meet the requirements of subsequent processing technologies such as mounting, dyeing and the like.
An embodiment of the application further provides a paperboard, and the paperboard is prepared by the preparation method of the paperboard.
The paperboard comprises a first surface and a second surface, wherein the first surface and the second surface are opposite; wherein the first and second surfaces have a surface water absorption of 40g/m2-120g/m2 at 1 minute.
Specifically, the water absorption value of the first surface and the second surface of the cardboard manufactured by the embodiment in 1 minute can be 40gsm, 50gsm, 60gsm, 70gsm, 80gsm, 90gsm, 100gsm, 110gsm, 120 gsm.
The bulk of the paperboard can reach 1.95-2.0g/cm 3.
Specifically, the bulk of the cardboard can be 1.95g/cm3, 1.96g/cm3, 1.97g/cm3, 1.98g/cm3, 1.99g/cm3 and 2.0g/cm 3.
The paperboard obtained in the embodiment has certain paper strength on the premise of high bulk. The paperboard can be suitable for the field of medium and high grade food packaging paperboards or other fields needing high bulk paperboards, can meet the requirements of subsequent processing technologies of food packaging, photo frame base paper and other purposes, can be used for printing or dyeing mount and light color, and has better stiffness and quality compared with a finished product made of common paperboard.
An embodiment of the present application also provides a paper making machine for producing a paperboard as described above.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A core layer slurry, comprising: bleaching chemical thermomechanical pulp;
the bleached chemithermomechanical pulp accounts for at least 65% of the mass ratio of the core layer pulp, so that the bulk of paper made of the core layer pulp is larger than 1.8.
2. The core stock according to claim 1, characterized in that it comprises broke stock, the bleached chemithermomechanical pulp and the broke stock being at least 85% by mass of the core stock.
3. The core layer slurry according to claim 2, characterized in that the bleached chemithermomechanical pulp and the broke pulp are present in a mass ratio of 85-95% of the core layer slurry.
4. The core layer pulp of claim 1, comprising a broke pulp, a bleached sulfate hardwood pulp, and a bleached sulfate softwood pulp, wherein the bleached chemithermomechanical pulp comprises 65% to 85% by mass of the core layer pulp; the mass ratio of the damaged paper pulp to the core layer pulp is 10-30%; the bleached sulfate hardwood pulp accounts for 0-10% of the mass ratio of the core layer pulp; the bleached sulfate softwood pulp accounts for 0-3% of the mass ratio of the core layer pulp.
5. The core layer slurry according to claim 1, further comprising a core layer enhancing chemical, wherein the core layer enhancing chemical is cationic starch, and the cationic starch is added in an amount of 10 to 20 kg/ton of slurry.
6. A method for producing a base paper, characterized in that the method comprises:
providing a top layer slurry, a bottom layer slurry and the core layer slurry of any one of claims 1-5;
adding rosin glue and aluminum sulfate solution into the surface layer slurry, the bottom layer slurry and the core layer slurry respectively to carry out internal sizing;
and respectively conveying the surface layer slurry, the bottom layer slurry and the core layer slurry to a surface net, a bottom net and a core net for papermaking, squeezing and drying to obtain the base paper.
7. The method of claim 6,
3-7 kg/ton pulp (calculated by absolute dry weight) of the rosin size is added into the core layer pulp; adding 10-20 kg/ton pulp (calculated by absolute dry weight) of the aluminum sulfate solution into the core layer pulp;
3-7 kg/ton of size (calculated by absolute dry weight) of the rosin size is added into the surface layer size; adding 0-10 kg/ton pulp (calculated by absolute dry weight) of the aluminum sulfate solution into the surface layer pulp;
3-7 kg/ton pulp (calculated by absolute dry weight) of the rosin size is added into the bottom layer pulp; 0-10 kg/ton pulp (calculated as absolute dry weight) of the aluminium sulphate solution is added to the bottom layer pulp.
8. A method for producing paperboard, said method comprising:
providing a base paper and a sizing material, wherein the base paper is prepared by the preparation method of any one of claims 6-7;
coating sizing materials on the surface of the base paper for surface sizing;
and drying and calendering the base paper after surface sizing is finished to obtain the paperboard.
9. The method of claim 8, wherein the applying size to the surface of the base paper for surface sizing comprises:
coating the sizing material on the first surface of the base paper, wherein the coating weight is 3g/m2-4.5g/m2, and the solid content of sizing accounts for 16% -24%, so as to form a first surface layer;
coating the sizing material on the second surface of the base paper, wherein the coating weight is 3g/m2-4.5g/m2, and the solid content of sizing accounts for 16% -24%, so as to form a second surface layer;
wherein the first surface and the second surface are opposite.
10. A paperboard, characterized in that it is produced by the process according to any one of claims 8-9.
11. A paperboard according to claim 10, wherein said paperboard comprises a first side and a second side, and said first side and said second side are opposite to each other; wherein,
the surface water absorption capacity of the first face and the second face is 40g/m2-120g/m2 per minute.
12. A paper making machine, characterized in that it is used for producing a paperboard according to any one of claims 10-11.
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| CN113981747A (en) * | 2021-10-28 | 2022-01-28 | 广西金桂浆纸业有限公司 | Card paper and preparation method thereof |
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