CN111335061A - Coated white paperboard and preparation method thereof - Google Patents

Coated white paperboard and preparation method thereof Download PDF

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Publication number
CN111335061A
CN111335061A CN202010273728.7A CN202010273728A CN111335061A CN 111335061 A CN111335061 A CN 111335061A CN 202010273728 A CN202010273728 A CN 202010273728A CN 111335061 A CN111335061 A CN 111335061A
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pulp
coating
slurry
parts
occ
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Inventor
李全勇
袁柳
李步文
丁高生
赵全虎
张金森
郑才桶
张秀灯
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Liansheng Paper Industry Longhai Co ltd
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Liansheng Paper Industry Longhai Co ltd
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    • 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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/025—De-inking
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

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Abstract

The inventors provide a method for preparing coated white board paper, comprising the steps of: pulping, preparing pulp, manufacturing paper, coating, calendaring and coiling. According to the technical scheme, the slurry, particularly OCC slurry, is subdivided by controlling raw materials and processes to prepare a lining layer and a mixed core layer, and a surface layer and a bottom layer are prepared by matching DIP slurry and ONP slurry; according to the base paper scheme, a specific coating formula is researched, and the base paper is subjected to curtain coating and scraper coating combined coating to obtain high-quality coated white board paper with the front whiteness of more than 70%, the folding resistance of more than or equal to 15 times and the roughness of less than or equal to 2.0 microns.

Description

Coated white paperboard and preparation method thereof
Technical Field
The invention relates to the field of papermaking, in particular to coated white board paper and a preparation method thereof.
Background
The coated white board paper has high whiteness of the coated surface, good smoothness, good ink absorbability and good printing glossiness, and the paper board has good stiffness and folding endurance, so that the white board paper can perform high-quality color offset printing and gravure printing, can meet the requirement of packaging, and is a high-quality material for manufacturing middle-high grade commodity packaging boxes.
The structure of the coated white board paper comprises a surface layer, a lining layer, a core layer and a bottom layer. The paper surface is required to reach whiteness of more than 70%. In the prior art, a surface layer provides certain whiteness (ISO) and color phase (L, a and b) values of base paper, the paper surface is clean, and the dust degree is low; the lining is under the surface course, and the purpose is to cover the darker sandwich layer of hue, the more mixed waste paper OCC thick liquid of impurity content, avoids sandwich layer thick liquid colour, impurity to permeate to the paper face, influences body paper appearance quality unqualified. The use cost that adopts BKP commodity white wood pulp in the surface course is high at present, and in order to reduce cost, some producers can be to adopting DIP thick liquid as the surface course, but can add chemical whitening agent in surface course and lining paper pulp, and the use of chemical whitening agent also can increase the cost, has certain pollution to the paper machine, causes the pollution to the environment.
Disclosure of Invention
In order to solve the above problems, it is necessary to provide a low-cost coated white paperboard and a method for preparing the same, wherein OCC pulp is used as a liner pulp without using a whitening agent, and the whiteness of a paper surface reaches above 70. To achieve the above object, the inventors provide a method for preparing coated white board paper, comprising the steps of:
pulping:
DIP deinked pulp preparation:
domestic office waste paper is used as a raw material, and is treated by a DIP deinking pulp line to obtain DIP deinking pulp;
the freeness of the DIP deinking pulp is 300-400ml, the whiteness of the pulp is 65-75 percent, and the pH value is 7-8;
preparing slurry of OCC short fiber slurry and OCC long fiber slurry:
using domestic waste box boards as raw materials, and obtaining OCC short fiber pulp and OCC long fiber pulp after the treatment of OCC pulping line comprising the steps of crushing, screening, grading and screening, purifying, concentrating, thermally dispersing and disc grinding;
the freeness of OCC fluff pulp is 250-330ml, and the pH value is 6-7;
the freeness of OCC long fiber pulp is 200-280ml, and the pH value is 6-7;
preparation of ONP slurry:
using waste newspaper as a raw material, and carrying out treatment by an ONP pulping line through the steps of pulping, screening, purifying, concentrating, thermally dispersing and disc grinding to obtain ONP pulp;
the freeness of the ONP slurry is 150-230ml, and the pH value is 6-7;
slurry preparation:
surface sizing: taking DIP deinking pulp as surface layer pulp; the amount of the prepared pulp is
Lining slurry mixing: using 70-80 wt% of OCC long fiber pulp and 20-30 wt% of damaged paper pulp as lining pulp;
core layer sizing: using 10-15 wt% of OCC long fiber pulp, 70-80 wt% of OCC short fiber pulp, 5-10 wt% of wood chip pulp and 0-10 wt% of broken paper pulp as core layer pulp;
bottom layer slurry blending: using ONP slurry as bottom slurry;
manufacturing paper:
making raw paper through the technological processes of a net part, a pressing part, a front drying part, surface sizing, a rear drying part, hard calendering and the like;
coating:
precoating: coating with a knife coater to form a coating with a coating weight of 14-15g/m2；
Curtain coating: using a curtain coater to carry out front coating, wherein the coating weight is 8-9g/m2；
Topcoat coating: coating with a knife coater to form a coating with a coating weight of 12-13g/m2；
Calendering and coiling:
drying the coated paperboard, performing soft calendering, and coiling.
Furthermore, in the step of preparing the OCC short fiber pulp and the OCC long fiber pulp, the screen gap of the grading screen is 0.13-0.15 mm.
Furthermore, the raw materials of the domestic waste box board for preparing the OCC short fiber pulp and the OCC long fiber pulp comprise 20 wt% of domestic waste A grade, 30 wt% of domestic waste B, C grade and 50 wt% of domestic waste D grade.
Further, the raw material newspaper waste for preparing the ONP slurry is B, C grade national waste.
Further, the solid content of the precoating slurry is 68-70%; comprises the following components in parts by mass: 100.00 parts of GCC65 grade and 0.1-0.2 part of alkali; 0.2-0.3 part of dispersing agent, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of CMC, 5.0-6.0 parts of coating starch, 6.0-8.0 parts of latex, 0.5-0.7 part of lubricating agent, 0.3-0.5 part of waterproof agent and 0.1-0.2 part of thickening agent;
the solid content of the top coating sizing agent is 64-66%; comprises the following components in parts by mass: 85-90 parts of GCC95 grade, 4.0-6.0 parts of calcined kaolin, 5.0-7.0 parts of china clay, 4.0-5.0 parts of PCC, 0.2-0.3 part of alkali, 0.2-0.3 part of dispersant, 0.1-0.2 part of defoamer, 0.2-0.4 part of CMC, 0.3-0.5 part of PVA, 10.0-12.0 parts of latex, 0.3-0.5 part of lubricant, 0.3-0.5 part of water repellent agent and 0.2-0.3 part of thickener;
the solid content of the curtain coating slurry is 61-62%; comprises the following components in parts by mass: 68.0-72.0 parts of GCC95 grade, 4.0-6.0 parts of china clay, 18.0-22.0 parts of calcined kaolin, 4.0-6.0 parts of PCC, 0.15-0.20 part of alkali, 0.1-0.2 part of dispersant, 0.2-0.44 part of CMC, 0.5-0.7 part of PVA and 10-13 parts of latex.
Further, the coating step further comprises back coating: the back coating was carried out using a knife coater with a coating amount of 1.1 to 1.4g/m2；
The inventor also provides a coated white board prepared by adopting any one of the preparation methods of the kraft liner board.
Furthermore, the gram range of the coated white board paper is 180 plus 290 grams per square meter, and the whiteness of the front surface is 70-74%.
Compared with the prior art, the technical scheme is that the slurry, particularly OCC slurry, is subdivided by controlling raw materials and processes to prepare a lining layer and a core layer, and a surface layer and a bottom layer are prepared by matching DIP slurry and ONP slurry; according to the base paper scheme, a specific coating formula is researched, and the base paper is subjected to curtain coating and scraper coating combined coating to obtain high-quality coated white board paper with the front whiteness of more than 70%, the folding resistance of more than or equal to 15 times and the roughness of less than or equal to 2.0 microns.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
The term is to be interpreted:
OCC is an abbreviation for Old Corrugated Container, translated as cardboard waste paper.
DIP is an abbreviation for deinked pulp, which is translated into deinked pulp.
ONP, an abbreviation of Old News Paper, is translated into waste newspaper;
the type, definition and quality judgment standard of the domestic waste OCC slurry raw materials.
The inventor divides the national waste raw materials into 5 grades according to different standards, different raw materials can be selected for production according to the requirements of customers in specific production, and the classification, definition and quality judgment standard table of the specific national waste raw materials are as follows:
Figure BDA0002444042940000041
the broke is leftover paper which is abnormally broken in the papermaking process of a paper machine and is trimmed when the finished part is rewound.
Pulping:
preparing the slurry by using DIP deinking slurry:
domestic office waste paper is used as a raw material, and is treated by a DIP deinking pulp line to obtain DIP deinking pulp;
the specific process flow is as follows: drum pulper → high concentration scummer → one section of coarse screen (1.4mm hole sieve) → medium concentration sieve (0.2mm slotted screen) → one section of flotation → low concentration scummer → low concentration fine screen (0.15mm slotted screen) → multi-disc thickener-one section of pressing spiral heat wind dispersion-bleaching tower → DIP pulp storage tower
The freeness of the DIP deinking pulp is 300-400ml, the whiteness of the pulp is 65-75 percent, and the pH value is 7-8;
preparing slurry from OCC short fiber slurry and OCC long fiber slurry:
using domestic waste box boards as raw materials, and obtaining OCC short fiber pulp and OCC long fiber pulp after the treatment of OCC pulping line comprising the steps of crushing, screening, grading and screening, purifying, concentrating, thermally dispersing and disc grinding;
the screen gap of the grading screen is 0.13-0.15 mm.
The specific process flow is as follows: hydropulper → high concentration slag separator → coarse screen (0.6mm hole screen) → reverse slag separator → classifying screen (0.13-0.15mm) → short fiber and long fiber
1) Long fiber → classifying screen (0.13-0.15mm) → low-concentration slag remover → fine screen (0.17mm) → multi-disc thickener → long fiber heat dispersion → disc mill → long fiber pulp storage tower
2) Concentration of short fiber to multiple discs → slurry storage tower for short fiber
The freeness of OCC fluff pulp is 250-330ml, and the pH value is 6-7;
the freeness of OCC long fiber pulp is 200-280ml, and the pH value is 6-7;
preparing ONP slurry:
using waste newspaper as a raw material, and carrying out treatment by an ONP pulping line through the steps of pulping, screening, purifying, concentrating, thermally dispersing and disc grinding to obtain ONP pulp;
the freeness of the ONP slurry is 150-230ml, and the pH value is 6-7;
the specific process flow is as follows:
drum pulper → high concentration slag separator → one section of coarse screen (1.4mm hole screen) → low concentration slag separator → low concentration fine screen (0.15mm slot screen) → flotation → multi-disc thickener → press spiral heat dispersion → pulp forming tank → disc mill → ONP pulp storage tower
After screening, classifying screening is carried out to classify the OCC slurry into short fibers and long fibers, and then fibers in various length ranges are optimally applied to the lining layer and the core layer to obtain paper with certain strength and durability.
Freeness is an indication of the drainage properties of the pulp, and in general, the greater the freeness of the pulp, the faster the drainage rate. The stock forms a sheet during the dewatering process, which sheet is continuously dewatered during the forming process. On the one hand, sheet formation requires removal of a large amount of water, but not too fast, and if the removal is too fast or too rapid, the stock fibers are formed without time to distribute uniformly on the wire, making it difficult to form a good quality sheet. On the other hand, too slow a dewatering causes the already dispersed fibers to re-flocculate.
Slurry preparation:
surface layer slurry preparation: taking DIP deinking pulp as surface layer pulp; DIP deinking pulp with high cleanliness
Lining layer slurry preparation: using 70-80 wt% of OCC long fiber pulp and 20-30 wt% of damaged paper pulp as lining pulp;
core layer slurry preparation: using 10-15 wt% of OCC long fiber pulp, 70-80 wt% of OCC short fiber pulp, 5-10 wt% of wood chip pulp and 0-10 wt% of broken paper pulp as core layer pulp;
preparing slurry at the bottom layer: and using the ONP slurry as a bottom layer slurry.
Manufacturing paper:
through thick liquids drifting system, adopt four to fold the net thick liquid, adopt dead weight formula and vacuum type dehydration shaping after, carry out 2 boots and press dehydration, 3 the calendering and decorate and stabilize the paper web, when providing into drying unit dryness fraction, increase the intensity of paper, drying unit carries out the surface sizing through each dryer steam and ventilation after to the evaporation drying of paper, surface sizing portion can provide paper surface strength and paper and absorb water control, carries out hard calendering and decorates.
Coating:
the front surface of the base paper is coated by 3 times (precoating, curtain coating and surface coating are sequentially carried out), a curtain coating and scraper coating are combined with a specific coating formula, the base paper prepared by DIP pulp for controlling freeness and OCC pulp with different titer is matched in a combined coating mode, the surface printing performance and the strength of the paper are provided for the paper, and the back surface of the base paper is coated by one time, so that the strength of the back surface paper is provided and the warping is prevented.
The solid content of the precoating slurry is 68-70%, and the viscosity is 1250-; comprises the following components in parts by mass: 100.00 parts of GCC65 grade and 0.1-0.2 part of alkali; 0.2-0.3 part of dispersing agent, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of CMC, 5.0-6.0 parts of coating starch, 6.0-8.0 parts of latex, 0.5-0.7 part of lubricating agent, 0.3-0.5 part of waterproof agent and 0.1-0.2 part of thickening agent;
the solid content of the top coating sizing agent is 64-66%, and the viscosity is 750-; comprises the following components in parts by mass: 85-90 parts of GCC95 grade, 4.0-6.0 parts of calcined kaolin, 5.0-7.0 parts of china clay, 4.0-5.0 parts of PCC, 0.2-0.3 part of alkali, 0.2-0.3 part of dispersant, 0.1-0.2 part of defoamer, 0.2-0.4 part of CMC, 0.3-0.5 part of PVA, 10.0-12.0 parts of latex, 0.3-0.5 part of lubricant, 0.3-0.5 part of water repellent agent and 0.2-0.3 part of thickener;
the curtain coating slurry has the solid content of 61-62 percent and the viscosity of 400-450 CPS; comprises the following components in parts by mass: 68.0-72.0 parts of GCC95 grade, 4.0-6.0 parts of china clay, 18.0-22.0 parts of calcined kaolin, 4.0-6.0 parts of PCC, 0.15-0.20 part of alkali, 0.1-0.2 part of dispersant, 0.2-0.44 part of CMC, 0.5-0.7 part of PVA and 10-13 parts of latex.
The back coating slurry is 10-12% starch slurry with viscosity of 25-35cps and coating temperature of 60-65 deg.C.
Pre-coating: coating with a knife coater to form a coating with a coating weight of 14-15g/m2；
Curtain coating: using a curtain coater to carry out front coating, wherein the coating weight is 8-9g/m2；
Surface coating: coating with a knife coater to form a coating with a coating weight of 12-13g/m2；
Back coating: using a scraperCoating the back surface of the coating machine with a coating weight of 1.1-1.4g/m2；
Calendering and coiling:
drying the coated paperboard, performing soft calendering, and coiling.
EXAMPLE 1 preparation of 180g of coated paper
Pulping:
preparing the slurry by using DIP deinking slurry:
domestic office waste paper is used as a raw material, and is treated by a DIP deinking pulp line to obtain DIP deinking pulp;
the specific process flow is as follows: drum pulper → high concentration scummer → one section of coarse screen (1.4mm hole sieve) → medium concentration sieve (0.2mm slotted screen) → one section of flotation → low concentration scummer → low concentration fine screen (0.15mm slotted screen) → multi-disc thickener-one section of pressing spiral heat wind dispersion-bleaching tower → DIP pulp storage tower
The freeness of the DIP deinking pulp is 350ml, the whiteness of the pulp is 70 percent, and the pH value is 7-8;
preparing slurry from OCC short fiber slurry and OCC long fiber slurry:
using national waste box boards (20 wt% of national waste A grade, 30 wt% of national waste B, C grade and 50 wt% of national waste D grade) as raw materials, and obtaining OCC short fiber pulp and OCC long fiber pulp after the treatment of steps of crushing, screening, classifying and screening, purifying, concentrating, thermally dispersing and disc grinding by an OCC pulping line;
the screen gap of the grading screen is 0.13-0.15 mm.
The specific process flow is as follows: hydropulper → high concentration slag separator → coarse screen (0.6mm hole screen) → reverse slag separator → classifying screen (0.13-0.15mm) → short fiber and long fiber
1) Long fiber → classifying screen (0.13-0.15mm) → low-concentration slag remover → fine screen (0.17mm) → multi-disc thickener → long fiber heat dispersion → disc mill → long fiber pulp storage tower
2) Concentration of short fiber to multiple discs → slurry storage tower for short fiber
The freeness of OCC fluff pulp is 280ml, and the pH value is 6-7;
the freeness of the OCC long fiber pulp is 240ml, and the pH value is 6-7;
preparing ONP slurry:
waste newspaper (ONP national waste B, C grade) is used as a raw material, and is subjected to steps of pulping, screening, purifying, concentrating, heat dispersing and disc grinding by an ONP pulping line to obtain ONP pulp;
the freeness of the ONP slurry is 200ml, and the pH value is 6-7;
the specific process flow is as follows:
drum pulper → high concentration slag separator → one section of coarse screen (1.4mm hole screen) → low concentration slag separator → low concentration fine screen (0.15mm slot screen) → flotation → multi-disc thickener → press spiral heat dispersion → pulp forming tank → disc mill → ONP pulp storage tower
Slurry preparation:
surface layer slurry preparation: taking DIP deinking pulp as surface layer pulp;
lining layer slurry preparation: using 70 wt% of OCC long fiber pulp and 30 wt% of broken paper pulp as lining pulp;
core layer slurry preparation: using 10 wt% of OCC long fiber pulp, 70 wt% of OCC short fiber pulp, 10 wt% of wood chip pulp and 10 wt% of broken paper pulp as core layer pulp;
preparing slurry at the bottom layer: and using the ONP slurry as a bottom layer slurry.
Manufacturing paper:
through thick liquids drifting system, adopt four to fold the net thick liquid, adopt dead weight formula and vacuum type dehydration shaping after, carry out 2 boots and press dehydration, 3 the calendering and decorate and stabilize the paper web, when providing into drying unit dryness fraction, increase the intensity of paper, drying unit carries out the surface sizing through each dryer steam and ventilation after to the evaporation drying of paper, surface sizing portion can provide paper surface strength and paper and absorb water control, carries out hard calendering and decorates.
The raw paper is made through the technological processes of a net part, a pressing part, a front drying part, surface sizing, a rear drying part, hard calendaring and the like. The base papers with different gram numbers are mainly reflected in the difference of the thickness of the core layer, and the specific process shows that the pulp hanging amount of the core layer is different.
Coating:
the front surface of the base paper is coated by 3 times (precoating, curtain coating and surface coating in sequence), a curtain coating and scraper coating are combined with a specific coating formula, the base paper prepared by DIP pulp for controlling freeness and OCC pulp with different titer is matched in a combined coating mode, the surface printing performance and paper strength are provided for paper, and the back surface of the base paper is coated by one time, the back surface paper strength is provided and the warping prevention adjustment is realized.
The solid content of the precoating slurry is 68%, and the viscosity is 1250 CPS; comprises the following components in parts by mass: 100.00 parts of GCC65 grade and 0.1 part of alkali; 0.2 mass part of dispersing agent, 0.1 mass part of defoaming agent, 0.3 mass part of CMC, 5.0 mass parts of coating starch, 6.0 mass parts of latex, 0.5 mass part of lubricating agent, 0.3 mass part of waterproof agent and 0.1 mass part of thickening agent;
the solid content of the top coating slurry is 64%, and the viscosity is 750 CPS; comprises the following components in parts by mass: 85 parts of GCC95 grade, 4.0 parts of calcined kaolin, 5.0 parts of china clay, 4.0 parts of PCC, 0.2 part of alkali, 0.2 part of dispersing agent, 0.1 part of defoaming agent, 0.2 part of CMC, 0.3 part of PVA, 10.0 parts of latex, 0.3 part of lubricating agent, 0.3 part of water repellent agent and 0.2 part of thickening agent;
the curtain coating slurry has the solid content of 61% and the viscosity of 400 CPS; comprises the following components in parts by mass: 68.0 parts of GCC95 grade, 4.0 parts of china clay, 18.0 parts of calcined kaolin, 4.0 parts of PCC, 0.15 part of alkali, 0.1 part of dispersant, 0.2 part of CMC, 0.5 part of PVA and 10 parts of latex.
The back coating slurry is 10-12% starch slurry with viscosity of 25-35cps and coating temperature of 60-65 deg.C.
Pre-coating: coating with a knife coater to form a coating with a coating weight of 14-15g/m2；
Curtain coating: using a curtain coater to carry out front coating, wherein the coating weight is 8-9g/m2；
Surface coating: coating with a knife coater to form a coating with a coating weight of 12-13g/m2；
Back coating: coating the back surface of the substrate with a knife coater at a coating weight of 1.1-1.4g/m2；
Calendering and coiling:
drying the coated paperboard, performing soft calendering, and coiling.
Example 2 preparation of 200g coated paper
The process of the embodiment 2 and the embodiment 1 has the following differences except that the core layer slurry hanging amount is different:
the coating slurry formulation was as follows
The solid content of the precoating slurry is 70%, and the viscosity is 1350 CPS; comprises the following components in parts by mass: 100.00 parts of GCC65 grade and 0.2 part of alkali; 0.3 part by mass of a dispersing agent, 0.2 part by mass of a defoaming agent, 0.4 part by mass of CMC, 6.0 parts by mass of coating starch, 8.0 parts by mass of latex, 0.7 part by mass of a lubricant, 0.5 part by mass of a water resistant agent and 0.2 part by mass of a thickening agent;
the solid content of the top coating sizing agent is 66%, and the viscosity is 850 CPS; comprises the following components in parts by mass: 90 parts by mass of GCC95 grade, 6.0 parts by mass of calcined kaolin, 7.0 parts by mass of china clay, 5.0 parts by mass of PCC, 0.3 part by mass of alkali, 0.3 part by mass of dispersing agent, 0.2 part by mass of defoaming agent, 0.4 part by mass of CMC, 0.5 part by mass of PVA, 12.0 parts by mass of latex, 0.5 part by mass of lubricating agent, 0.5 part by mass of water repellent agent and 0.3 part by mass of thickening agent;
the curtain coating slurry has a solid content of 62% and a viscosity of 450 CPS; comprises the following components in parts by mass: 72.0 parts of GCC95 grade, 6.0 parts of china clay, 22.0 parts of calcined kaolin, 6.0 parts of PCC, 0.20 part of alkali, 0.2 part of dispersant, 0.44 part of CMC, 0.7 part of PVA and 13 parts of latex.
Example 3 preparation of 220g coated paper
The difference between the process of example 3 and the process of example 1 except the slurry hanging amount of the core layer is as follows: the coating slurry formulation was as follows
The solid content of the precoating slurry is 69%, and the viscosity is 1310 CPS; comprises the following components in parts by mass: 100.00 parts of GCC65 grade and 0.15 part of alkali; 0.25 mass part of dispersing agent, 0.15 mass part of defoaming agent, 0.35 mass part of CMC, 5.5 mass parts of coating starch, 7.0 mass parts of latex, 0.6 mass part of lubricating agent, 0.4 mass part of waterproof agent and 0.15 mass part of thickening agent;
the solid content of the top coating slurry is 65%, and the viscosity is 785 CPS; comprises the following components in parts by mass: 88 parts by mass of GCC95 grade, 5.0 parts by mass of calcined kaolin, 6.0 parts by mass of china clay, 4.5 parts by mass of PCC, 0.25 part by mass of alkali, 0.25 part by mass of dispersing agent, 0.15 part by mass of defoaming agent, 0.3 part by mass of CMC, 0.4 part by mass of PVA, 11.0 parts by mass of latex, 0.4 part by mass of lubricating agent, 0.4 part by mass of water repellent agent and 0.25 part by mass of thickening agent;
the curtain coating slurry has a solid content of 61% and a viscosity of 410 CPS; comprises the following components in parts by mass: 70.0 parts of GCC95 grade, 5.0 parts of china clay, 20.0 parts of calcined kaolin, 5.0 parts of PCC, 0.18 part of alkali, 0.15 part of dispersant, 0.3 part of CMC, 0.6 part of PVA and 12 parts of latex.
Example 4 preparation of 240g coated paper
The difference between the processes of example 4 and example 1 is that:
in the pulping step
The freeness of the DIP deinking pulp is 300ml, the whiteness of the pulp is 75 percent, and the pH value is 7-8;
the freeness of the OCC fluff pulp is 250ml, and the pH value is 6-7;
the freeness of the OCC long fiber pulp is 200ml, and the pH value is 6-7;
the freeness of the ONP slurry is 150ml, and the pH value is 6-7;
the slurry preparation step comprises:
lining layer slurry preparation: using 80 wt% of OCC long fiber pulp and 20 wt% of broken paper pulp as lining pulp;
core layer slurry preparation: using 15 wt% of OCC long fiber pulp, 80 wt% of OCC short fiber pulp, 5 wt% of wood chip pulp and core layer pulp as raw materials;
EXAMPLE 5 preparation of 290g coated paper
The difference between the processes of example 5 and example 1 is that:
in the pulping step
The freeness of the DIP deinking pulp is 400ml, the whiteness of the pulp is 65 percent, and the pH value is 7-8;
the freeness of the OCC fluff pulp is 330ml, and the pH value is 6-7;
the freeness of the OCC long fiber pulp is 280ml, and the pH value is 6-7;
the freeness of the ONP slurry is 230ml, and the pH value is 6-7;
the slurry preparation step comprises:
lining layer slurry preparation: using 75 wt% of OCC long fiber pulp and 25 wt% of broken paper pulp as lining pulp;
core layer slurry preparation: using 15 wt% of OCC long fiber pulp, 70 wt% of OCC short fiber pulp, 10 wt% of wood chip pulp and 5 wt% of broke pulp as core layer pulp.
The coated papers prepared in examples 1-5 were tested and the results are shown in the following table:
Figure BDA0002444042940000121
Figure BDA0002444042940000131
and (3) testing conditions are as follows: the temperature is 23 +/-1 ℃; humidity 50 +/-2%.
According to the technical scheme, the slurry, particularly OCC slurry, is subdivided by controlling raw materials and processes to prepare a lining layer and a core layer, and a surface layer and a bottom layer are prepared by matching DIP slurry and ONP slurry; according to the scheme of the base paper, a specific coating formula is researched, the base paper is subjected to curtain coating and scraper coating combined coating, and high-quality coated white board paper with the whiteness of over 70 percent on the front surface, the folding endurance of more than or equal to 15 times and the roughness of less than or equal to 2.0 mu m is obtained, the white board paper is high in whiteness, good in smoothness, good in ink absorption and good in printing gloss, and the paperboard has good stiffness and folding endurance, so that the cost is saved on the basis of ensuring the quality.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "inside", "below" and the like are understood to include the number.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.

Claims (8)

1. A preparation method of coated white board paper is characterized by comprising the following steps:
pulping:
DIP deinked pulp preparation:
domestic office waste paper is used as a raw material, and is treated by a DIP deinking pulp line to obtain DIP deinking pulp;
the freeness of the DIP deinking pulp is 300-400ml, the whiteness of the pulp is 65-75 percent, and the pH value is 7-8;
preparing slurry of OCC short fiber slurry and OCC long fiber slurry:
using domestic waste box boards as raw materials, and obtaining OCC short fiber pulp and OCC long fiber pulp after the treatment of OCC pulping line comprising the steps of crushing, screening, grading and screening, purifying, concentrating, thermally dispersing and disc grinding;
the freeness of OCC fluff pulp is 250-330ml, and the pH value is 6-7;
the freeness of OCC long fiber pulp is 200-280ml, and the pH value is 6-7;
preparation of ONP slurry:
using waste newspaper as a raw material, and carrying out treatment by an ONP pulping line through the steps of pulping, screening, purifying, concentrating, thermally dispersing and disc grinding to obtain ONP pulp;
the freeness of the ONP slurry is 150-230ml, and the pH value is 6-7;
slurry preparation:
surface sizing: taking DIP deinking pulp as surface layer pulp;
lining slurry mixing: using 70-80 wt% of OCC long fiber pulp and 20-30 wt% of damaged paper pulp as lining pulp;
core layer sizing: using 10-15 wt% of OCC long fiber pulp, 70-80 wt% of OCC short fiber pulp, 5-10 wt% of wood chip pulp and 0-10 wt% of broken paper pulp as core layer pulp;
bottom layer slurry blending: using ONP slurry as bottom slurry;
manufacturing paper:
making raw paper through the processes of a net part, a pressing part, a front drying part, surface sizing, a rear drying part and hard calendering;
coating:
precoating, top coating with a knife coater, coating weight 14-15g/m2；
Curtain coating, top coating using a curtain coater, coating weight 8-9g/m2；
Topcoat coating: coating with a knife coater to form a coating with a coating weight of 12-13g/m2；
Calendering and coiling:
drying the coated paperboard, performing soft calendering, and coiling.
2. The method according to claim 1, wherein in the step of preparing the OCC short fiber pulp and OCC long fiber pulp, the screen gap of the classifying screen is 0.13-0.15 mm.
3. The method according to claim 1, wherein the raw material of the domestic waste boxboard for preparing the OCC short fiber pulp and the OCC long fiber pulp comprises 20 wt% of domestic waste A grade, 30 wt% of domestic waste B, C grade and 50 wt% of domestic waste D grade.
4. The method of claim 1, wherein the raw newspaper waste for the preparation of the ONP slurry is a national waste B, C grade.
5. The production method according to claim 1,
the solid content of the precoating slurry is 68-70%, and the viscosity is 1250-; comprises the following components in parts by mass: 100.00 GCC grade, 0.1-0.2 alkali; 0.2-0.3 part of dispersing agent, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of CMC, 5.0-6.0 parts of coating starch, 6.0-8.0 parts of latex, 0.5-0.7 part of lubricating agent, 0.3-0.5 part of waterproof agent and 0.1-0.2 part of thickening agent;
the solid content of the top coating sizing agent is 64-66%, and the viscosity is 750-; comprises the following components in parts by mass: 85-90 parts of GCC95 grade, 4.0-6.0 parts of calcined kaolin, 5.0-7.0 parts of china clay, 4.0-5.0 parts of PCC, 0.2-0.3 part of alkali, 0.2-0.3 part of dispersant, 0.1-0.2 part of defoamer, 0.2-0.4 part of CMC, 0.3-0.5 part of PVA, 10.0-12.0 parts of latex, 0.3-0.5 part of lubricant, 0.3-0.5 part of water repellent agent and 0.2-0.3 part of thickener;
the curtain coating slurry has the solid content of 61-62 percent and the viscosity of 400-450 CPS; comprises the following components in parts by mass: 68.0-72.0 parts of GCC95 grade, 4.0-6.0 parts of china clay, 18.0-22.0 parts of calcined kaolin, 4.0-6.0 parts of PCC, 0.15-0.20 part of alkali, 0.1-0.2 part of dispersant, 0.2-0.44 part of CMC, 0.5-0.7 part of PVA and 10-13 parts of latex.
6. The method of claim 1, wherein the coating step further comprises back coating: coating the back surface of the substrate with a knife coater at a coating weight of 1.1-1.4g/m2。
7. A coated white board, characterized in that it is produced by the process according to any one of claims 1 to 6.
8. The coated white board of claim 7, wherein the coated white board has a grammage of 180-290g per square meter and a front side whiteness of 70-74%.
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