CN108824062B - Production method for producing coated white board paper by using OCC (acrylic acid copolymer) pulp instead of ONP (acrylonitrile-butadiene-styrene) pulp - Google Patents
Production method for producing coated white board paper by using OCC (acrylic acid copolymer) pulp instead of ONP (acrylonitrile-butadiene-styrene) pulp Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229920002126 Acrylic acid copolymer Polymers 0.000 title description 3
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 title description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 title description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 title description 3
- 239000000835 fiber Substances 0.000 claims abstract description 87
- 239000010410 layer Substances 0.000 claims abstract description 39
- 239000002761 deinking Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000012792 core layer Substances 0.000 claims abstract description 14
- 239000010893 paper waste Substances 0.000 claims abstract description 12
- 238000004537 pulping Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000000123 paper Substances 0.000 claims description 108
- 238000004513 sizing Methods 0.000 claims description 54
- 238000000576 coating method Methods 0.000 claims description 47
- 239000011248 coating agent Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 26
- 239000003292 glue Substances 0.000 claims description 15
- 238000012216 screening Methods 0.000 claims description 15
- 239000002699 waste material Substances 0.000 claims description 13
- 238000012546 transfer Methods 0.000 claims description 12
- 239000002344 surface layer Substances 0.000 claims description 11
- 229920002472 Starch Polymers 0.000 claims description 10
- 238000003490 calendering Methods 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- 239000008107 starch Substances 0.000 claims description 10
- 239000011087 paperboard Substances 0.000 claims description 7
- 241000274582 Pycnanthus angolensis Species 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 3
- 238000007645 offset printing Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 230000003746 surface roughness Effects 0.000 abstract description 5
- 230000008676 import Effects 0.000 abstract description 2
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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
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- 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
- 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
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- 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 invention relates to a production method for producing coated white board paper by using OCC pulp instead of ONP pulp, which relates to the technical field of pulping and papermaking production, wherein OCC medium-fiber pulp is used as a lining layer and a bottom layer for pulp mixing, OCC short-fiber pulp and OCC long-fiber pulp are used as a core layer for pulp mixing, the pulp preparation process is simplified, the import quantity of ONP waste paper raw materials and the consumption of deinking chemicals are reduced, the raw material cost is reduced, the pulp yield is improved, the performance of the produced coated white board paper is improved, the surface roughness (PPS) is 1.0-1.8 mu m, the surface strength (IGT) is 1.2-1.8 m/S, the offset printing performance (RI) is 4-6 times, the folding resistance is 12-20 times, the glossiness of the finished paper is 39-42%, the ink absorptivity is 21-28%, and the smoothness is 140-200S, so that the standard of high-grade coated white board paper is achieved.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a production method for producing coated white board by using OCC (acrylic acid copolymer) pulp instead of ONP (acrylonitrile-butadiene-styrene) pulp.
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. At present, most of coated white boards use imported ONP (Old News Paper) such as American waste No. 3, No. 6, No. 8, No. 9 and OMG (Old Magazine) as base stock to prepare ONP and OMG deinking pulp as the base stock of the coated white boards. With the implementation of the national 'banned foreign garbage entry pushing solid waste import management system reform implementation scheme', the improvement of the production process of the coated white board paper ensures that the use of imported ONP waste newspaper is reduced or not used in the new process, and the improvement is an urgent demand of various paper making enterprises. The ONP pulp uses recycled waste paper as a raw material, and is subjected to processes of crushing, screening and purifying, multi-channel flotation, multi-channel thermal dispersion, bleaching, fine pulp and the like, so that the yield is low (about 75%), the water consumption and the power consumption are high, deinking chemical auxiliary materials are consumed, more slag and water are discharged, the waste residue and waste water are environmentally-friendly, and the comprehensive cost of the ONP pulp is high. How to effectively reduce the consumption of the ONP slurry becomes a great subject of the production technology of coated grey white board paper.
Disclosure of Invention
Therefore, a production method for producing coated white board paper instead of ONP pulp is needed to solve the problems of reducing or even not using imported ONP newspaper waste to produce coated white board paper and further reducing consumption of deinking chemical auxiliary materials and discharge of deinking dangerous solid waste.
In the process of realizing the invention, the inventor finds that OCC waste paper pulp is classified into OCC short fibers, OCC medium fibers and OCC long fibers through a classifying screen, wherein the length of the OCC medium fiber fibers and the cleanliness of the pulp are more suitable for preparing a bottom layer of paper, and the prepared coated white board paper has good evenness, smoothness and cleanliness of the bottom layer of the paper, and meets the quality requirements of flat and fine back surface and low impurity content of the high-grade coated white board paper.
Therefore, the inventor provides a production method for producing coated white board by using OCC pulp instead of ONP pulp, which comprises the following steps:
preparing slurry:
the method comprises the following steps of (1) preparing mixed pulp of OCC medium fiber pulp and OCC short fiber and long fiber by using waste boxboard pulp as a raw material and performing crushing, screening, classified screening, purification, concentration, thermal dispersion and fine pulp in an OCC pulping line; using recycled office waste paper as a raw material, and obtaining DIP deinking pulp after the treatment of DIP deinking pulp line;
preparing pulp and manufacturing paper:
deinking with the DIPThe slurry is surface layer slurry, and the quantitative amount of the prepared slurry is 30-35 g/m2Taking the OCC medium fiber pulp as lining pulp, and proportioning the pulp by a fixed amount of 26-35 g/m2Mixing OCC short fiber and long fiber mixed pulp as core layer pulp, and proportioning the pulp with the quantitative ratio of 90-270 g/m2Taking the OCC medium fiber pulp as bottom layer pulp, and proportioning the pulp by a quantitative ratio of 26-35 g/m2Using a four-lap net paper machine to manufacture paper, respectively dehydrating and forming each layer, and forming a composite wet paper web by using lining cores, core bottoms and face bottom composite rolls;
surface sizing:
removing a surface sizing machine from the surface layer, the lining layer, the core layer and the bottom layer base paper after pulp preparation and papermaking through the technical processes of a net part, a pressing part, a front drying part and the like, preparing glue with the concentration of 25 wt%, the glue viscosity of 150-200 mPa & s, the solid content of a work groove of a surface sizing station of 10-12%, the viscosity of 15-30 mPa & s and the glue application amount of 1.2-1.5 g/m2 on the back surface of the paper, and preparing the paper after surface sizing;
coating:
carrying out post-drying part, hard calendering and front surface precoating on the paper subjected to surface sizing, and then carrying out back surface coating process to obtain coated paper;
and (3) coating the front surface of the coated paper twice, coating the top surface, calendaring, reeling and rewinding to obtain the coated white board paper.
As a preferred method of the invention, in order to improve the problem that the back of the coated white board paper is not smooth and rough, the classification screening comprises classification treatment of a first-stage classification screen and a second-stage classification screen, screen gaps of the first-stage classification screen and the second-stage classification screen are 0.127mm, and the method has the advantages that the uniformity, the flatness and the bottom layer cleanliness of the paper made by the paper are good, and the quality requirements of smoothness, fineness, low impurity content and low quality of the back of the high-grade coated white board paper are met.
After screening, grading screening is carried out to grade and screen the OCC slurry into medium fibers, short fibers and long fibers, and then the fibers in various length ranges are optimally applied to each layer of the surface, lining, core and bottom, so that a flat, fine and clean high-grade coated white board paper product is obtained.
In a preferable method of the invention, in order to improve the strength of the coated white board, the OCC has a fiber pulp freeness of 230-250 ml and a fiber wet weight of 4-6 g.
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, if the dehydration is too slow, the dispersed fibers are caused to be flocculated again, so that the OCC medium fiber pulp with the freeness of 230-250 ml and the wet weight of the fibers of 4-6 g is selected, the bonding of the fine fibers in the pulp for coating the white board paper can be stronger, and the good quality of the formed paper sheet is ensured.
As a preferred method of the present invention, the surface sizing step employs a film transfer sizing approach in order to improve the problems of sheet surface properties, sheet void structure, absorbency and printability.
Surface sizing is also known as paper sizing. After the sheet is formed, the semi-dry sheet or the dried sheet is uniformly coated with a sizing material. The main role of surface sizing is: (1) the surface performance of the paper is improved: the surface coating can fill and level up the gaps on the surface of the paper sheet, and greatly improve the surface properties such as smoothness of the paper sheet and the like; (2) improving the void structure and absorption properties of the paper sheet: the surface is coated with the sizing material which can close the gap of the paper surface and can further improve the hydrophobicity or lipophobicity of the paper surface by selecting proper sizing material; (3) improving the printability of the paper sheet: the surface strength of the paper sheet is improved, the paper sheet has good durability and wear resistance, the glossiness is improved, and the printability of the paper sheet is comprehensively improved. In addition, surface sizing can also improve the physical strength of the paper sheet. The film transfer sizing is a surface sizing mode that sizing materials are measured by a groove metering rod and then transferred to a paper surface through a sizing roller, and the sizing amount can be adjusted by adjusting the pressure of the metering rod, the concentration of surface sizing and the groove width of the groove metering rod. The advantage of using a film transfer sizing method is that the amount of sizing can be controlled by precisely controlling the metering rod to ensure uniform and consistent film formation.
In a preferable method of the invention, the back coating process adopts a transfer roller, the solid content of back coating starch is 10-12%, the viscosity is 10-30 mPa.s, the back coating weight is 2.0-2.5 g/m2, and the back coating starch is uniformly coated on the back of the paper.
In a preferred method of the present invention, the concentration is performed by using a multi-disc thickener, and the fine pulp is performed by using a double-disc refiner.
The multiple disc is a filter which runs continuously under vacuum and has a hollow shaft on which hollow filter discs are mounted, which in combination rotate in a trough filled with slurry. This compact design allows for a large filter area for the multiple discs. A distribution valve is mounted at one end of the hollow shaft and controls the vacuum area of the filter plate by mechanical means. The filter plate can have different vacuum degrees at different rotation positions through control. The outlet end of the filtrate was sealed with a water-sealed tank. Once the filter plate is below the slurry level, the filtrate will separate from the fibers, which stay on the filter plate forming a thin slurry layer. When the filter plate rotates further to pass through the groove body, the thickness of the fiber pulp layer is continuously increased, and fine fibers and small particles in the pulp should be retained on the pulp layer. The thicker the pulp layer, the clearer the filtrate will pass. The amount of clear filtrate and turbid filtrate can be adjusted by means of a distribution valve. The slurry layer is then peeled off from one end by a stripping nozzle, the slurry falls by its own weight into a collection tank mounted between the two discs, dilution water is simultaneously added to this collection tank and homogenized by a crushing screw.
The structural principle of the double-disc refiner is as follows: the double-disc pulping machine consists of a pulping chamber, a transmission mechanism, a base, a motor and the like. The grinding chamber is formed by two fixed grinding plates fixed on the machine shell and the movable seat and two rotating grinding plates arranged on the rotating disc to form two grinding areas. The grinding discs with different tooth shapes are exchanged to meet the pulping requirements of various pulps. The slurry enters the center of the grinding area through two slurry inlet pipes, passes through the grinding area under the action of centrifugal force and slurry inlet pressure, and is kneaded and extruded by a fluted disc in the grinding area to complete the pulping process.
The technical scheme is characterized in that OCC medium fiber pulp is prepared by adopting an OCC pulping line to perform disintegration, screening, classified screening, purification, concentration, thermal dispersion and fine pulp instead of ONP bottom pulp in the traditional production process of coated white board paper, one-stage and two-stage classified screening is selected, OCC short fiber and long fiber mixed pulp is used for coating white board paper core layer pulp blending, and OCC medium fiber pulp is used for lining and bottom layer pulp blending, so that the imported quantity of ONP waste paper raw materials and the consumption of deinking chemicals are reduced, the raw material cost is reduced, the pulp yield is improved, the performance of the produced coated white board paper is improved, and the standard of high-grade coated white board paper is achieved.
Drawings
Fig. 1 is a production method of coated white board paper by using OCC slurry instead of ONP slurry in this embodiment.
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 english acronyms appearing in the application documents are now described as follows:
ONP-Old News Paper, waste newspaper;
DIP-Deinked Pulp, Deinked Pulp;
OMG-Old Magazine, Old Magazine;
OCC-Old Corrugated Container, waste liner.
Example one
Referring to fig. 1, the present embodiment provides a method for producing coated white board paper by using OCC slurry instead of ONP slurry, which specifically comprises:
preparing slurry:
the recovered OCC waste boxboard paper pulp is used as a raw material, the pulp enters a fiber classifying screen after the processes of disintegration, high-concentration slag removal and coarse screening, and after the pulp is classified by a first-stage classifying screen and a second-stage classifying screen with screen gaps of 0.127mm, the OCC pulp is classified into OCC short fibers, OCC medium fibers and OCC long fibers. Because the length of OCC medium fiber and the cleanliness of the pulp are more suitable for preparing the bottom layer of white board paper, the medium fiber pulp obtained by grading is sent to a medium fiber thermal dispersion system after passing through a low-concentration slag remover and a multi-disc thickener, and then sent to a double-disc refiner after being treated by the thermal dispersion system. And (3) effectively dispersing stickies, oil wax and other hot-melt matters in the optimized OCC medium fiber pulp to obtain high-cleanliness OCC medium fiber pulp, wherein the freeness is 230ml, and the wet weight of fibers is 5.95 g.
The recycled office waste paper is used as a raw material, and is treated by a conventional process of a DIP deinking pulp line to obtain DIP deinking pulp, wherein the whiteness value of the DIP deinking pulp is 76.
Preparing pulp and manufacturing paper:
the DIP deinking pulp is used as surface layer pulp, and the pulp proportioning ration is 30g/m2Taking the OCC medium fiber pulp as lining pulp, and proportioning the pulp with the quantitative rate of 26g/m2Using OCC short fiber and long fiber mixed pulp as core layer pulp, proportioning pulp quantitative 90g/m2Taking the OCC medium fiber pulp as bottom layer pulp, and proportioning the pulp with the quantitative rate of 26g/m2Using a four-lap net paper machine to manufacture paper, respectively dehydrating and forming each layer, and forming a composite wet paper web by using lining cores, core bottoms and face bottom composite rolls;
surface sizing:
and (3) subjecting the surface layer, the lining layer, the core layer and the bottom layer base paper which are made by pulp preparation to technological processes of a net part, a pressing part, a front drying part and the like, then removing a surface sizing machine, preparing the paper with the glue concentration of 25 wt%, the glue viscosity of 168mPa & s, the solid content of a working groove of a surface sizing material station of 11%, the viscosity of 15mPa & s and the glue application amount of the back surface of the paper of 1.2g/m2, and preparing the paper after surface sizing, wherein preferably, the surface sizing step adopts a film transfer sizing mode for sizing.
Coating:
the paper after surface sizing is subjected to a post-drying part, hard calendering, front surface pre-coating and then a back surface coating process to prepare the coated paper, wherein the back surface coating process adopts a transfer roller, the solid content of back coating starch is 11%, the viscosity is 15mPa & s, the back coating weight is 2.2g/m2, and the back coating starch is uniformly coated on the back surface of the paper.
And (3) coating the front surface of the coated paper twice, coating the top surface, calendaring, reeling and rewinding to obtain the coated white board paper.
The coated white paperboard prepared by the technical scheme has the surface roughness (PPS) of 1.0-1.8 microns, the surface strength (IGT) of 1.2-1.8 m/S, the offset printing performance (RI) of 4-6 times, the folding resistance of 12-20 times, the glossiness of the finished paper of 39-42%, the ink absorptivity of 21-28% and the smoothness of 140-200S.
Example two
Referring to fig. 1, the present embodiment provides a method for producing coated white board paper by using OCC slurry instead of ONP slurry, which specifically comprises:
preparing slurry: the recovered OCC waste boxboard paper pulp is used as a raw material, the pulp enters a fiber classifying screen after the processes of disintegration, high-concentration slag removal and coarse screening, and after the pulp is classified by a first-stage classifying screen and a second-stage classifying screen with screen gaps of 0.127mm, the OCC pulp is classified into OCC short fibers, OCC medium fibers and OCC long fibers. Because the length of OCC medium fiber and the cleanliness of the pulp are more suitable for preparing the bottom layer of white board paper, the medium fiber pulp obtained by grading is sent to a medium fiber thermal dispersion system after passing through a low-concentration slag remover and a multi-disc thickener, and then sent to a double-disc refiner after being treated by the thermal dispersion system. And (3) effectively dispersing stickies, oil wax and other hot-melt matters in the optimized OCC medium fiber pulp to obtain high-cleanliness OCC medium fiber pulp, wherein the freeness is 242ml, and the wet weight of fibers is 4.02 g.
The recycled office waste paper is used as a raw material, and is treated by a conventional process of a DIP deinking pulp line to obtain DIP deinking pulp, wherein the whiteness value of the DIP deinking pulp is 79.
Preparing pulp and manufacturing paper:
the DIP deinking pulp is used as surface layer pulp, and the pulp proportioning ration is 35g/m2Taking the OCC medium fiber pulp as lining pulp, and proportioning the pulp with the quantitative rate of 35g/m2Using OCC short fiber and long fiber mixed pulp as core layer pulp, proportioning quantitative 270g/m2Taking the OCC medium fiber pulp as bottom layer pulp, and preparing pulp with the quantitative rate of 35g/m2Using a four-lap net paper machine to manufacture paper, respectively dehydrating and forming each layer, and forming a composite wet paper web by using lining cores, core bottoms and face bottom composite rolls;
surface sizing:
and (3) subjecting the surface layer, the lining layer, the core layer and the bottom layer base paper which are made by pulp preparation to technological processes of a net part, a pressing part, a front drying part and the like, then removing a surface sizing machine, preparing the paper with the glue concentration of 25 wt%, the glue viscosity of 150mPa & s, the solid content of a working groove of a surface sizing material station of 10%, the viscosity of 20mPa & s and the glue application amount of the back surface of the paper of 1.2g/m2, and preparing the paper after surface sizing, wherein preferably, the surface sizing step adopts a film transfer sizing mode for sizing.
Coating:
the paper after surface sizing is subjected to a post-drying part, hard calendering, front surface pre-coating and then a back surface coating process to prepare the coated paper, wherein the back surface coating process adopts a transfer roller, the solid content of back coating starch is 10%, the viscosity is 10mPa & s, the back coating weight is 2.0g/m2, and the back coating starch is uniformly coated on the back surface of the paper.
And (3) coating the front surface of the coated paper twice, coating the top surface, calendaring, reeling and rewinding to obtain the coated white board paper.
The coated white board paper prepared by the technical scheme has the surface roughness (PPS) of 1.0-1.8 microns, the surface strength (IGT) of 1.2-1.8 m/S, the offset printing performance (RI) of 4-6 times and the folding resistance of 12-20 times, the glossiness of the finished paper is 39-42%, the ink absorptivity is 21-28%, and the smoothness is 140-200S.
EXAMPLE III
Referring to fig. 1, the present embodiment provides a method for producing coated white board paper by using OCC slurry instead of ONP slurry, which specifically comprises:
preparing slurry:
the recovered OCC waste boxboard paper pulp is used as a raw material, the pulp enters a fiber classifying screen after the processes of disintegration, high-concentration slag removal and coarse screening, and after the pulp is classified by a first-stage classifying screen and a second-stage classifying screen with screen gaps of 0.127mm, the OCC pulp is classified into OCC short fibers, OCC medium fibers and OCC long fibers. Because the length of OCC medium fiber and the cleanliness of the pulp are more suitable for preparing the bottom layer of white board paper, the medium fiber pulp obtained by grading is sent to a medium fiber thermal dispersion system after passing through a low-concentration slag remover and a multi-disc thickener, and then sent to a double-disc refiner after being treated by the thermal dispersion system. And (3) effectively dispersing stickies, oil wax and other hot-melt matters in the optimized OCC medium fiber pulp to obtain high-cleanliness OCC medium fiber pulp, wherein the freeness is 242ml, and the wet weight of fibers is 4.02 g.
The recycled office waste paper is used as a raw material, and is treated by a conventional process of a DIP deinking pulp line to obtain the DIP deinking pulp, wherein the whiteness value of the DIP deinking pulp is 77.
Preparing pulp and manufacturing paper:
the DIP deinking pulp is used as surface layer pulp, and the pulp proportioning ration is 30g/m2Taking the OCC medium fiber pulp as lining pulp, and proportioning the pulp with the fixed quantity of 30g/m2Using OCC short fiber and long fiber mixed pulp as core layer pulp, proportioning pulp quantitative 200g/m2Taking the OCC medium fiber pulp as bottom layer pulp, and preparing the pulp with the fixed quantity of 30g/m2Using a four-lap net paper machine to manufacture paper, respectively dehydrating and forming each layer, and forming a composite wet paper web by using lining cores, core bottoms and face bottom composite rolls;
surface sizing:
and (3) subjecting the surface layer, the lining layer, the core layer and the bottom layer base paper which are made by pulp preparation to technological processes of a net part, a pressing part, a front drying part and the like, then removing a surface sizing machine, preparing the paper with the glue concentration of 25 wt%, the glue viscosity of 200mPa & s, the solid content of a working groove of a surface sizing material station of 12%, the viscosity of 30mPa & s and the glue application amount of the back surface of the paper of 1.5g/m2, and preparing the paper after surface sizing, wherein preferably, the surface sizing step adopts a film transfer sizing mode for sizing.
Coating:
the paper after surface sizing is subjected to a post-drying part, hard calendering, front surface pre-coating and then a back surface coating process to prepare the coated paper, wherein the back surface coating process adopts a transfer roller, the solid content of back coating starch is 12%, the viscosity is 30mPa & s, the back coating weight is 2.5g/m2, and the back coating starch is uniformly coated on the back surface of the paper.
And (3) coating the front surface of the coated paper twice, coating the top surface, calendaring, reeling and rewinding to obtain the coated white board paper.
The coated white board paper prepared by the technical scheme has the surface roughness (PPS) of 1.0-1.8 microns, the surface strength (IGT) of 1.2-1.8 m/S, the offset printing performance (RI) of 4-6 times and the folding resistance of 12-20 times, the glossiness of the finished paper is 39-42%, the ink absorptivity is 21-28%, and the smoothness is 140-200S.
The invention adopts OCC medium fiber pulp as lining and bottom layer pulp mixing pulp, OCC short fiber and long fiber pulp as core layer pulp mixing pulp, OCC waste paper is used for replacing imported ONP waste paper raw material, taking an annual 70 ten thousand ton coated white board production line as an example, the invention can reduce imported ONP waste paper raw material American waste 8# and American waste 9#11 ten thousand ton/year. The raw material cost and the water, electricity and steam cost are greatly reduced, the yield of the bottom layer pulp is improved from 70-75% to 85-88%, the consumption of deinking chemicals is reduced, the pollution of discharged deinking slag to the environment is reduced, and the production cost of enterprises is greatly reduced. The surface roughness (PPS) of the produced coated white board paper is 1.0-1.8 mu m, the surface strength (IGT) is 1.2-1.8 m/S, the offset printing performance (RI) is 4-6 times, the folding resistance is 12-20 times, the glossiness of the finished paper is 39-42%, the ink absorptivity is 21-28%, and the smoothness is 140-200S, so that the index of high-grade coated white board paper is reached, and the product performance is improved.
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 content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (1)
1. A production method for producing coated white board paper by using OCC pulp to replace ONP pulp is characterized by comprising the following steps:
preparing slurry:
the method comprises the following steps of (1) preparing mixed pulp of OCC medium fiber pulp and OCC short fiber and long fiber by using waste boxboard pulp as a raw material and performing crushing, screening, classified screening, purification, concentration, thermal dispersion and fine pulp in an OCC pulping line; using recycled office waste paper as a raw material, and obtaining DIP deinking pulp after the treatment of DIP deinking pulp line;
preparing pulp and making:
taking the DIP deinking pulp as surface layer pulp, and proportioning the pulp with the quantitative ratio of 30-35 g/m2Taking the OCC medium fiber pulp as lining pulp, and proportioning the pulp by a fixed amount of 26-35 g/m2Mixing OCC short fiber and long fiber mixed pulp as core layer pulp, and proportioning the pulp with the quantitative ratio of 90-270 g/m2Taking the OCC medium fiber pulp as bottom layer pulp, and proportioning the pulp by a quantitative ratio of 26-35 g/m2Using a four-lap wire paper machine to make paperMaking, each layer is dehydrated and formed respectively, and a composite wet paper web is formed by a lining core, a core bottom and a surface bottom composite roller;
surface sizing:
after the surface layer, the lining layer, the core layer and the bottom layer base paper which are made by pulp preparation and papermaking are processed by a screen part, a pressing part and a front drying part, a surface sizing machine is removed, the prepared glue concentration is 25 wt%, the prepared glue viscosity is 150-200 mPa.s, the solid content of the glue solution of a working tank of a surface sizing station is 10-12%, the viscosity is 15-30 mPa.s, and the back sizing amount of the paper is 1.2-1.5 g/m2Preparing paper after surface sizing;
coating:
carrying out post-drying part, hard calendering and front surface precoating on the paper subjected to surface sizing, and then carrying out back surface coating process to obtain coated paper;
coating the front surface of the coated paper twice, coating the top surface, calendering, reeling and rewinding to prepare coated white board paper;
the classification screening comprises classification treatment of a first-stage classification screen and a second-stage classification screen, and screen gaps of the first-stage classification screen and the second-stage classification screen are both 0.127 mm;
the freeness of fiber pulp in the OCC is 230-250 ml, and the wet weight of the fiber is 4-6 g;
the surface sizing step adopts a film transfer sizing mode;
the back coating process adopts a transfer roller, the solid content of back coating starch is 10-12%, the viscosity is 10-30 mPa.s, and the back coating weight is 2.0-2.5 g/m2Coating back coating starch on the back of the paper;
the concentration adopts a multi-disc thickener, and the fine pulp adopts a double-disc refiner.
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| CN110295508B (en) * | 2019-07-02 | 2020-08-04 | 浙江金龙再生资源科技股份有限公司 | Method for treating waste paper with low lignin content, low transition metal content and high wet strength |
| CN111691235B (en) * | 2020-06-28 | 2021-04-13 | 浙江金励环保纸业有限公司 | Gray board paper and preparation method thereof |
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| CN103437242B (en) * | 2013-07-22 | 2014-11-12 | 吉安集团有限公司 | White craft paper and production method thereof |
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Denomination of invention: A production method for producing coated whiteboard paper using OCC pulp instead of ONP pulp Effective date of registration: 20231222 Granted publication date: 20210302 Pledgee: Bank of Communications Ltd. Zhangzhou branch Pledgor: LIANSHENG PAPER INDUSTRY (LONGHAI) Co.,Ltd. Registration number: Y2023350000261 |
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