CN117488594B - Manufacturing process of bleached wood pulp dried-noodle gypsum board facing paper - Google Patents
Manufacturing process of bleached wood pulp dried-noodle gypsum board facing paper Download PDFInfo
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- CN117488594B CN117488594B CN202311732591.7A CN202311732591A CN117488594B CN 117488594 B CN117488594 B CN 117488594B CN 202311732591 A CN202311732591 A CN 202311732591A CN 117488594 B CN117488594 B CN 117488594B
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- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000010440 gypsum Substances 0.000 title claims abstract description 35
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 94
- 239000012792 core layer Substances 0.000 claims abstract description 45
- 239000002344 surface layer Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000004537 pulping Methods 0.000 claims abstract description 18
- 235000012149 noodles Nutrition 0.000 claims abstract description 6
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 230000001815 facial effect Effects 0.000 claims abstract description 4
- 239000000123 paper Substances 0.000 claims description 67
- 239000002002 slurry Substances 0.000 claims description 58
- 239000000835 fiber Substances 0.000 claims description 42
- 238000010009 beating Methods 0.000 claims description 41
- 238000004513 sizing Methods 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 17
- 229920002472 Starch Polymers 0.000 claims description 16
- 239000008107 starch Substances 0.000 claims description 16
- 235000019698 starch Nutrition 0.000 claims description 16
- 239000010893 paper waste Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 15
- 235000013312 flour Nutrition 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 239000011122 softwood Substances 0.000 claims description 9
- 239000002562 thickening agent Substances 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 239000004382 Amylase Substances 0.000 claims description 6
- 102000013142 Amylases Human genes 0.000 claims description 6
- 108010065511 Amylases Proteins 0.000 claims description 6
- 235000019418 amylase Nutrition 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 239000011121 hardwood Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 5
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 5
- 235000005822 corn Nutrition 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 229920002261 Corn starch Polymers 0.000 claims description 3
- 102000004190 Enzymes Human genes 0.000 claims description 3
- 108090000790 Enzymes Proteins 0.000 claims description 3
- 229920002522 Wood fibre Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 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 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000008120 corn starch Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000009144 enzymatic modification Effects 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000002025 wood fiber Substances 0.000 claims description 3
- 241000209149 Zea Species 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 description 10
- 239000000945 filler Substances 0.000 description 9
- 125000000129 anionic group Chemical group 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 240000008042 Zea mays Species 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
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- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 150000001768 cations Chemical class 0.000 description 1
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- 229920001577 copolymer Polymers 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
-
- 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
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
-
- 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
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the 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
- 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
- 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
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of gypsum board facing paper production, and discloses a process for manufacturing bleached wood pulp fine dried noodle gypsum board facing paper, which comprises the following steps: s1: pulping, wherein the pulping is divided into three production lines, namely: bleached wood pulp production line, deinked facial pulp production line and OCC production line; s2: the paper making adopts four layers of net composite forming of a surface layer, a lining layer, a core layer and a bottom layer; wherein, the surface layer is coated with 100% bleached wood pulp, the lining layer is coated with 40-60% bleached wood pulp and 40-60% deinked surface pulp, and the core layer and the bottom layer are mixed pulp of an OCC pulp tower in the pulping section. The invention effectively improves the whiteness and glossiness of the paper and obviously improves the appearance of the product.
Description
Technical Field
The invention relates to the technical field of gypsum board facing paper production, in particular to a process for manufacturing bleached wood pulp fine dried noodle gypsum board facing paper.
Background
The paper gypsum board is a common suspended ceiling decorative material applied at present, has the advantages of light weight, fire resistance, shock resistance, heat preservation, heat insulation, good processing performance and the like, is convenient to construct, good in dismounting performance and good in decorative effect, and can enlarge the service area of a building. With the continued development of the construction industry and the increasing demand of people for decorative styles, the demand of gypsum boards is also increasing.
At present, the gypsum board facing paper is produced by using waste paper pulp, the whiteness of the facing pulp is generally low, the whiteness is basically 40-50% ISO, and the appearance quality deviation is caused by the fact that the waste paper pulp contains impurities such as printing ink, coating, color points and the like, so that the requirements of high-grade decoration cannot be effectively met, and along with the continuous increase of market requirements, the requirements of people on the appearance of gypsum boards are higher and higher. Therefore, there is an urgent need to develop a gypsum board facing paper with high whiteness, attractive appearance and no impurities.
Disclosure of Invention
The invention aims to provide a process for manufacturing bleached wood pulp dried noodle gypsum board facing paper, which aims to solve the problem that the surface cleanliness of the gypsum board facing paper in the prior art cannot meet the requirements of high-grade clients.
In order to solve the technical problems, the invention provides a process for manufacturing bleached wood pulp dried noodle gypsum board facing paper, which comprises the following steps:
S1: pulping, wherein the pulping is divided into three production lines, namely: bleached wood pulp production line, deinked facial pulp production line and OCC production line;
S2: the paper making adopts four layers of net composite forming of a surface layer, a lining layer, a core layer and a bottom layer; wherein, the surface layer is coated with 100% bleached wood pulp, the lining layer is coated with 40-60% bleached wood pulp and 40-60% deinked surface pulp, and the core layer and the bottom layer are mixed pulp of an OCC pulp tower in the pulping section.
Further, the process parameters of the bleached wood pulp production line are as follows:
The raw material ratio is 40-60% bleached softwood pulp and 40-60% bleached hardwood pulp, the bleached softwood pulp and the bleached hardwood pulp are evenly mixed and then crushed by a high-concentration pulper, the crushed bleached softwood pulp is directly pumped into a bleached wood pulp beating front tank, and then the pulp is crushed and pulped by a double-disc refiner and enters a bleached wood pulp beating rear tank to form the finished bleached wood pulp with the concentration of 5% and the beating degree of 25-35 DEG SR.
Further, the technological parameters of the deinking-free flour pulp production line are as follows:
Adding 30-50% of domestic newspaper and 50-70% of book page book paper into a rotary drum pulper after uniformly mixing the raw materials, adding 20ppm of clean enzyme, reacting the waste paper with chemicals in the pulper, pulping to form thick slurry with the weight concentration of 5%, removing heavy impurities in the slurry by a high-concentration slag remover, beating into a rotary drum pulp discharging tank, diluting to 4% concentration, coarse screening to remove impurity fragments, large plastic and wood fiber sheets, diluting to 1.5% concentration, further removing fine impurities by a fine screening, removing fine sand impurities with the weight of pulp fibers by a low-concentration slag remover, further purifying the slurry, concentrating by a multi-disc thickener, then entering a thermal dispersion system, subdividing the adhesive in the slurry into invisible particles with the weight concentration of 5%, entering a pre-beating tank, further fluffing the slurry by a double-disc refiner, entering a non-deinked face pulp tank, and controlling the beating degree to be 40-52 DEG SR.
Further, the technological parameters of the OCC production line are as follows:
Uniformly mixing needle natural color primary pulp with 20-40% of raw material and domestic cardboard paper with 60-80%, adding into a high-concentration pulper, crushing into thick pulp with 3-4% of mass concentration, and separating into long and short fibers by a high-concentration slag remover, a coarse screen and a classifying screen;
Short fibers pass through a low-concentration slag separator and a multi-disc thickener, then enter an OCC line short fiber beating front pulp tank, pulp is further defiberized and beaten by a double-disc refiner, and short fiber pulp with the concentration of 5% and the beating degree of 36-40 DEG SR is formed in the short fiber beating rear pulp tank;
The long fibers enter an OCC line long fiber beating front pulp tank after passing through a low-concentration slag separator, a multi-disc thickener and thermal dispersion, pulp is further defiberized and beaten by utilizing a double-disc refiner, and the long fiber beating rear pulp tank is used for forming long pulp with the concentration of 5 percent and the beating degree of 30-35 degrees; the long and short fibers were then combined according to 4: the 6-proportion pumping paper storage pulp tower is used after being uniformly mixed to form pulp with the concentration of 5 percent and the beating degree of 35-38 DEG SROCC.
Further, in the step S2, the four layers of the surface layer, the lining layer, the core layer and the bottom layer are formed by passing through a pump, a high-level box, a pulp flushing tank, a pulp flushing pump and a screen before net until the pulp flowing box is formed by net surfing; the four layers of sizing agent are sprayed onto the four layers of forming nets through a head box, the compound dryness of each layer is ensured to be 10-15% by controlling the waterline of the net part, and then the four layers of sizing agent are reeled into paper rolls with different specifications through a couch roll, a vacuum suction roll, a vacuum press roll, two large-roll-diameter press rolls, a pre-drying part, a semi-drying calender, a surface sizing machine, a post-drying part, a cold bellows and reeling.
Further, the core layer uses a mixed pulp of an OCC pulp tower, and the bottom layer uses OCC short fiber pulp.
Further, in the step S2, the slurry hanging amount of the surface layer, the lining layer and the bottom layer respectively accounts for 1/5 of the total ration, and the slurry hanging amount of the core layer accounts for 2/5 of the total ration.
In the step S2, 8-10 kg/ton of gelatinized cationic starch is added before four layers of pulp pumps, 6-8 kg/ton of aluminum sulfate is added after each layer of pulp pumps, the pH value of the system is controlled to be 6.5-7.5, ASA sizing agent is added after the pulp pumps, and the addition amount is 3-3.5 kg/ton of paper.
Further, in the step S2, a binary retention and drainage agent consisting of a dry powder retention agent and a liquid drainage agent is added after the screening before the screen; wherein, the consumption of the dry powder retention aid is 0.2 kg/ton of paper, and the consumption of the liquid retention aid is 0.4 kg/ton of paper.
Further, in the step S2, the surface sizing machine utilizes the corn primary starch and amylase to carry out enzymatic modification, the amylase dosage is 150 g/ton corn starch, the starch dosage is 10-20 kg/ton paper, and the front and back surfaces of the paper are sized
Compared with the prior art, the invention has the following beneficial effects:
Firstly, the surface layer adopts 100% bleached wood pulp, the whiteness can reach more than 75%, meanwhile, the surface layer adopts bleached wood pulp and non-deinked surface pulp, so that the problem of poor evenness caused by overhigh transparency of the surface layer can be effectively solved, the whiteness and glossiness of paper are effectively improved, and the appearance of the product is obviously improved.
And secondly, compared with the deinked flour pulp process, the deinked flour pulp process does not generate hazardous waste (ink), so that the environmental friendliness is effectively improved.
Moreover, the bleached wood pulp can effectively improve the tensile strength of the finished paper, reduce the addition of dry strength agents, reinforcing starch and other chemical engineering; further, bleached wood pulp is mixed by adopting needle pulp and broadleaf pulp, so that the beating degree of the bleached wood pulp is improved under the condition of effectively reducing the production cost, the problem of large beating degree deviation between a surface layer and a lining layer is solved, and the problem of layering of the surface lining is effectively avoided.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a process for manufacturing bleached wood pulp dried-noodle gypsum board facing paper, which comprises the following steps:
S1: pulping, wherein the pulping is divided into three production lines, namely: bleached wood pulp production line, deinked facial pulp production line and OCC production line;
S2: the paper making adopts four layers of net composite forming of a surface layer, a lining layer, a core layer and a bottom layer; wherein, the surface layer is coated with 100% bleached wood pulp, the lining layer is coated with 40-60% bleached wood pulp and 40-60% deinked surface pulp, and the core layer and the bottom layer are mixed pulp of an OCC pulp tower in the pulping section.
In some embodiments, the bleached wood pulp production line process parameters are: the raw material ratio is 40-60% bleached softwood pulp and 40-60% bleached hardwood pulp, the bleached softwood pulp and the bleached hardwood pulp are evenly mixed and then crushed by a high-concentration pulper, the crushed bleached softwood pulp is directly pumped into a bleached wood pulp beating front tank, and then the pulp is crushed and pulped by a double-disc refiner and enters a bleached wood pulp beating rear tank to form the finished bleached wood pulp with the concentration of 5% and the beating degree of 25-35 DEG SR.
In some embodiments, the deinking facer pulp line process parameters are:
Adding 30-50% of domestic newspaper and 50-70% of book page book paper into a rotary drum pulper after uniformly mixing the raw materials, adding 20ppm of clean enzyme, reacting the waste paper with chemicals in the pulper, pulping to form thick slurry with the weight concentration of 5%, removing heavy impurities in the slurry by a high-concentration slag remover, beating into a rotary drum pulp discharging tank, diluting to 4% concentration, coarse screening to remove impurity fragments, large plastic and wood fiber sheets, diluting to 1.5% concentration, further removing fine impurities by a fine screening, removing fine sand impurities with the weight of pulp fibers by a low-concentration slag remover, further purifying the slurry, concentrating by a multi-disc thickener, then entering a thermal dispersion system, subdividing the adhesive in the slurry into invisible particles with the weight concentration of 5%, entering a pre-beating tank, further fluffing the slurry by a double-disc refiner, entering a non-deinked face pulp tank, and controlling the beating degree to be 40-52 DEG SR.
The OCC production line has the process parameters that:
Uniformly mixing needle natural color primary pulp with 20-40% of raw material and domestic cardboard paper with 60-80%, adding into a high-concentration pulper, crushing into thick pulp with 3-4% of mass concentration, and separating into long and short fibers by a high-concentration slag remover, a coarse screen and a classifying screen;
Short fibers pass through a low-concentration slag separator and a multi-disc thickener, then enter an OCC line short fiber beating front pulp tank, pulp is further defiberized and beaten by a double-disc refiner, and short fiber pulp with the concentration of 5% and the beating degree of 36-40 DEG SR is formed in the short fiber beating rear pulp tank;
The long fibers enter an OCC line long fiber beating front pulp tank after passing through a low-concentration slag separator, a multi-disc thickener and thermal dispersion, pulp is further defiberized and beaten by utilizing a double-disc refiner, and the long fiber beating rear pulp tank is used for forming long pulp with the concentration of 5 percent and the beating degree of 30-35 degrees; the long and short fibers were then combined according to 4: the 6-proportion pumping paper storage pulp tower is used after being uniformly mixed to form pulp with the concentration of 5 percent and the beating degree of 35-38 DEG SROCC.
In the step S2, the four layers of the surface layer, the lining layer, the core layer and the bottom layer are formed by passing through a pump, a high-level box, a pulp flushing tank, a pulp flushing pump and a screen before net until the pulp flowing box is formed by net feeding; the four layers of sizing agent are sprayed onto the four layers of forming nets through a head box, the compound dryness of each layer is ensured to be 10-15% by controlling the waterline of the net part, and then the four layers of sizing agent are reeled into paper rolls with different specifications through a couch roll, a vacuum suction roll, a vacuum press roll, two large-roll-diameter press rolls, a pre-drying part, a semi-drying calender, a surface sizing machine, a post-drying part, a cold bellows and reeling.
In some embodiments, in the step S2, the surface layer, the lining layer and the bottom layer each account for 1/5 of the total basis weight, and the core layer accounts for 2/5 of the total basis weight.
In some embodiments, in the step S2, 8-10 kg/ton of gelatinized cationic starch is added before four layers of pulp pumps, 6-8 kg/ton of aluminum sulfate is added after each layer of pulp pumps, the pH value of the system is controlled to be 6.5-7.5, ASA sizing agent is added after the pulp pumps, and the addition amount is 3-3.5 kg/ton of paper.
In some embodiments, in the step S2, a binary retention and drainage aid consisting of a dry powder retention aid and a liquid drainage aid is added after the pre-screen; wherein, the consumption of the dry powder retention aid is 0.2 kg/ton of paper, and the consumption of the liquid retention aid is 0.4 kg/ton of paper.
In some embodiments, in the step S2, the surface sizing machine uses the form of corn primary starch and amylase to carry out enzymatic modification, the amylase is used for 150 g/ton of corn starch, the starch is used for 10-20 kg/ton of paper, and the front side and the back side of the paper are sized.
Embodiment 1 is based on the above-mentioned process for manufacturing bleached wood pulp dried-face gypsum board, which uses surface layer slurry, lining slurry, core layer slurry and bottom layer slurry as raw materials, and adopts a net-folding forming technology to obtain the bleached wood pulp dried-face gypsum board with four layers of surface layer, lining layer, core layer and bottom layer.
Wherein, the surface layer slurry is prepared by mixing bleached broad-leaved slurry, bleached needle-leaved slurry and filler according to a mass ratio of 500:500:0.2, uniformly stirring and mixing to obtain bleached broadleaf pulp and bleached broadleaf pulp, wherein the bleached broadleaf pulp ensures the whiteness stability and the cleanliness of paper, and the filler has the function of increasing the covering property; the lining pulp is 50% bleached wood pulp and 50% deinked flour pulp, and the freeness of the lining pulp is controlled to be close to that of the flour pulp so as to ensure the interlayer bonding strength, and the problem of poor evenness caused by overhigh transparency of the flour layer can be effectively solved; the core layer slurry is OCC waste paper long and short fiber mixed slurry, and the freeness of the core layer slurry is controlled to be close to that of the lining layer slurry so as to ensure interlayer bonding strength; the bottom layer sizing agent OCC waste paper short fiber pulp improves the flatness and cleanliness of the back surface, and the relative impurity content in the OCC long fiber pulp is high, so that the cleanliness of paper surface and the tensile strength of products can be better guaranteed only by using the core layer, and cationic starch is added when the lining, core and bottom layer sizing agent flows out from the corresponding core layer pulping tanks.
In this example, the surface layer has a grammage of 35g/m 2, the core layer has a grammage of 35g/m 2, the core layer has a grammage of 70g/m 2, and the bottom layer has a grammage of 40g/m 2.
In addition, the preparation method of the filler comprises the following steps: grinding marble Dan Yan into calcium carbonate filler with the particle size of 2 mu m and the weight ratio of more than 60%, adding 75kg of calcium carbonate filler into 25kg of water, continuously adding 1kg of anionic dispersing agent, stirring and mixing uniformly, and then adding 150kg of water for dilution to obtain water-dispersible slurry; then adding 1kg of corn cationic starch to the water-dispersible slurry, wherein the anionic dispersing agent and the corn cationic starch form larger flocks through the interaction of anions and cations, but the flocks are unstable and can be dispersed again in the process of high-speed stirring and pumping, and then adding 0.5kg of high-molecular anionic auxiliary agent to keep the larger flocks, so that the flocks can resist shearing force in the flowing process. The smaller flocculus state is kept, the retention rate is improved, the dispersion is uniform, the covering property of the surface layer slurry is improved, and the uniformity of the surface layer is improved.
The anionic dispersing agent is an anionic acrylamide-sodium acrylate copolymer, and the macromolecular anionic auxiliary agent is polyacrylamide. ,
Example 2, a bleached wood pulp dried-face-sheet gypsum board mask paper manufacturing process, which uses surface layer slurry, lining slurry, core layer slurry and bottom layer slurry as raw materials, and adopts a net-folding forming technology to obtain the bleached wood pulp dried-face-sheet gypsum board mask paper with four layers of surface layers, lining layers, core layers and bottom layers.
The difference from the above example 1 is that the surface layer slurry is a bleached broadleaf slurry, a bleached needle-leaf slurry and a filler according to a mass ratio of 400:600:0.2, uniformly stirring and mixing to obtain bleached broadleaf pulp and bleached broadleaf pulp, wherein the bleached broadleaf pulp ensures the whiteness stability and the cleanliness of paper, and the filler has the function of increasing the covering property; the lining pulp is 40% bleached wood pulp and 60% deinked flour pulp, and the freeness of the lining pulp is controlled to be close to that of the flour pulp so as to ensure the interlayer bonding strength, and the problem of poor evenness caused by overhigh transparency of the flour layer can be effectively solved; the core layer slurry is OCC waste paper long and short fiber mixed slurry, and the freeness of the core layer slurry is controlled to be close to that of the lining layer slurry so as to ensure interlayer bonding strength; the bottom layer sizing agent OCC waste paper short fiber pulp improves the flatness and cleanliness of the back surface, and the relative impurity content in the OCC long fiber pulp is high, so that the cleanliness of paper surface and the tensile strength of products can be better guaranteed only by using the core layer, and cationic starch is added when the lining, core and bottom layer sizing agent flows out from the corresponding core layer pulping tanks.
In this example, the grammage of the top layer is 30g/m 2, the grammage of the core layer is 30g/m 2, the grammage of the core layer is 80g/m 2, and the grammage of the bottom layer is 40g/m 2.
Embodiment 3, a bleached wood pulp dried-face gypsum board mask paper manufacturing process, which uses surface layer slurry, lining slurry, core layer slurry and bottom layer slurry as raw materials, and adopts a net-folding forming technology to obtain the bleached wood pulp dried-face gypsum board mask paper with four layers of surface layers, lining layers, core layers and bottom layers.
The difference from the above example 1 is that the surface layer slurry is a bleached broadleaf slurry, a bleached needle-leaf slurry and a filler according to a mass ratio of 600:400:0.2, uniformly stirring and mixing to obtain bleached broadleaf pulp and bleached broadleaf pulp, wherein the bleached broadleaf pulp ensures the whiteness stability and the cleanliness of paper, and the filler has the function of increasing the covering property; the lining pulp is 60% bleached wood pulp and 40% deinked flour pulp, and the freeness of the lining pulp is controlled to be close to that of the flour pulp so as to ensure the interlayer bonding strength, and the problem of poor evenness caused by overhigh transparency of the flour layer can be effectively solved; the core layer slurry is OCC waste paper long and short fiber mixed slurry, and the freeness of the core layer slurry is controlled to be close to that of the lining layer slurry so as to ensure interlayer bonding strength; the bottom layer sizing agent OCC waste paper short fiber pulp improves the flatness and cleanliness of the back surface, and the relative impurity content in the OCC long fiber pulp is high, so that the cleanliness of paper surface and the tensile strength of products can be better guaranteed only by using the core layer, and cationic starch is added when the lining, core and bottom layer sizing agent flows out from the corresponding core layer pulping tanks.
In this example, the grammage of the top layer is 25g/m 2, the grammage of the core layer is 25g/m 2, the grammage of the core layer is 80g/m 2, and the grammage of the bottom layer is 50g/m 2.
Comparative example
The production method of the common gypsum board facing paper adopts surface layer slurry, lining layer slurry, core layer slurry and bottom layer slurry as raw materials, and adopts a net-folding forming technology to obtain the common gypsum board facing paper with four layers of composite surface layers, lining layers, core layers and bottom layers; wherein, the surface layer slurry is prepared by uniformly mixing domestic newspaper with 60% book page paper with the raw material ratio of 40%; the lining, core and bottom layer slurry is OCC waste paper long and short fiber mixed slurry; cationic starch is added when the lining, core and bottom layer slurry flows out of the corresponding core layer slurry forming pond.
In this comparative example, the grammage of the top layer was 35g/m 2, the grammage of the core layer was 35g/m 2, the grammage of the core layer was 80g/m 2, and the grammage of the bottom layer was 30g/m 2.
The bleached wood pulp dried gypsum board facestock papers obtained in examples 1 to 3 and comparative example were subjected to index testing and the results are shown in table 1 below.
Wherein whiteness is measured with reference to GB/T7974-2013 and tensile strength is measured with reference to GB/T12914-2018.
TABLE 1 bleached wood pulp dried gypsum board facestock paper index test
Whiteness (% ISO) tensile Strength (N.m/g)
| Category(s) | Surface layer hanging quantity (g/m 2) | Surface layer sizing agent | Whiteness (% ISO) resistance | Tensile Strength (N.m/g) |
| Example 1 | 35 | Bleached pulp | 78 | 14.5 |
| Example 2 | 30 | Bleached pulp | 74 | 13.0 |
| Example 3 | 25 | Bleached pulp | 72 | 12.8 |
| Comparison group | 35 | Waste paper pulp | 45 | 11.0 |
As is clear from Table 1, the bleached wood pulp-dried gypsum board facer paper obtained in examples 1 to 3 has high whiteness, good tensile strength and good overall quality.
The comparative example surface layer adopts 40% of domestic newspaper and 60% of page book paper waste paper as surface pulp, and various indexes of the obtained gypsum board surface paper such as whiteness, combat strength and the like are obviously deteriorated, which indicates that the surface pulp raw material is adjusted to waste paper pulp, and the product index is seriously influenced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The process for manufacturing the bleached wood pulp dried-noodle gypsum board facing paper is characterized by comprising the following steps of:
S1: pulping, wherein the pulping is divided into three production lines, namely: bleached wood pulp production line, deinked facial pulp production line and OCC production line;
s2: the paper making adopts four layers of net composite forming of a surface layer, a lining layer, a core layer and a bottom layer; wherein, the surface layer is hung with 100% bleached wood pulp, the lining layer is hung with 40-60% bleached wood pulp and 40-60% deinked surface pulp, and the core layer and the bottom layer are mixed pulp of an OCC pulp tower in the pulping section;
the technological parameters of the bleached wood pulp production line are as follows:
The raw material ratio is 40-60% bleached softwood pulp and 40-60% bleached hardwood pulp, after being uniformly mixed, the bleached softwood pulp and the bleached hardwood pulp are crushed by a high-concentration pulper, after being crushed, the bleached softwood pulp is directly pumped into a bleached wood pulp beating front tank, then the pulp is crushed and pulped by a double-disc refiner and enters a bleached wood pulp beating rear tank to form finished bleached wood pulp with the concentration of 5% and the beating degree of 25-35 DEG SR;
The technological parameters of the deinking-free flour pulp production line are as follows:
Adding 30-50% of domestic newspaper and 50-70% of book page book paper into a rotary drum pulper after uniformly mixing the raw materials, adding 20ppm of clean enzyme, reacting the waste paper with chemicals in the pulper, pulping to form thick slurry with the weight concentration of 5%, removing heavy impurities in the slurry by a high-concentration slag remover, beating into a rotary drum pulp discharging tank, diluting to 4% concentration, coarse screening to remove impurity fragments, large plastic and wood fiber sheets, diluting to 1.5% concentration, further removing fine impurities by a fine screening, removing fine sand impurities with the weight of pulp fibers by a low-concentration slag remover, further purifying the slurry, concentrating by a multi-disc thickener, then entering a thermal dispersion system, subdividing the adhesive in the slurry into invisible particles with the weight concentration of 5%, entering a pre-beating tank, further fluffing the slurry by a double-disc refiner, entering a non-deinked face pulp tank, and controlling the beating degree to be 40-52 DEG SR.
2. The process for making bleached wood pulp dried gypsum board facer paper according to claim 1, wherein the OCC line process parameters are:
Uniformly mixing needle natural color primary pulp with 20-40% of raw material and domestic cardboard paper with 60-80%, adding into a high-concentration pulper, crushing into thick pulp with 3-4% of mass concentration, and separating into long and short fibers by a high-concentration slag remover, a coarse screen and a classifying screen;
Short fibers pass through a low-concentration slag separator and a multi-disc thickener, then enter an OCC line short fiber beating front pulp tank, pulp is further defiberized and beaten by a double-disc refiner, and short fiber pulp with the concentration of 5% and the beating degree of 36-40 DEG SR is formed in the short fiber beating rear pulp tank;
The long fibers enter an OCC line long fiber beating front pulp tank after passing through a low-concentration slag separator, a multi-disc thickener and thermal dispersion, pulp is further defiberized and beaten by utilizing a double-disc refiner, and the long fiber beating rear pulp tank is used for forming long pulp with the concentration of 5 percent and the beating degree of 30-35 degrees; the long and short fibers were then combined according to 4: the 6-proportion pumping paper storage pulp tower is used after being uniformly mixed to form pulp with the concentration of 5 percent and the beating degree of 35-38 DEG SROCC.
3. The process for manufacturing the bleached wood pulp dried gypsum board facer paper according to claim 1, wherein,
In the step S2, the four layers of the surface layer, the lining layer, the core layer and the bottom layer are formed by passing through a pump, a high-level box, a pulp flushing tank, a pulp flushing pump and a screen before net until the pulp flowing box is formed by net feeding; the four layers of sizing agent are sprayed onto the four layers of forming nets through a head box, the compound dryness of each layer is ensured to be 10-15% by controlling the waterline of the net part, and then the four layers of sizing agent are reeled into paper rolls with different specifications through a couch roll, a vacuum suction roll, a vacuum press roll, two large-roll-diameter press rolls, a pre-drying part, a semi-drying calender, a surface sizing machine, a post-drying part, a cold bellows and reeling.
4. A process for making bleached wood pulp dried gypsum board facer paper according to claim 1 or 3, wherein the core layer uses a mixed pulp of OCC pulp towers and the bottom layer uses OCC staple fiber pulp.
5. The process for producing bleached wood pulp dried gypsum board facestock according to claim 1, wherein in step S2, the surface layer, the lining layer and the bottom layer each account for 1/5 of the total basis weight, and the core layer accounts for 2/5 of the total basis weight.
6. The process for producing bleached wood pulp dried noodle gypsum board facer paper according to claim 3, wherein in step S2, 8-10 kg/ton of gelatinized cationic starch is added before four layers of pulp pumps, 6-8 kg/ton of aluminum sulfate is added after each layer of pulp pumps, the pH value of the system is controlled to be 6.5-7.5, and ASA sizing agent is added after the pulp pumps, wherein the addition amount is 3-3.5 kg/ton of paper.
7. The process for making bleached wood pulp dried gypsum board facer paper according to claim 3, wherein in step S2, a binary retention and drainage aid composed of a dry powder retention aid and a liquid drainage aid is added after the screen before and after the screen; wherein, the consumption of the dry powder retention aid is 0.2 kg/ton of paper, and the consumption of the liquid retention aid is 0.4 kg/ton of paper.
8. The process for producing bleached wood pulp dried noodle gypsum board facer paper according to claim 3, wherein in the step S2, the surface sizing machine uses corn primary starch and amylase to carry out enzymatic modification, the amylase dosage is 150 g/ton corn starch, the starch dosage is 10-20 kg/ton paper, and the front and back sides of the paper are sized.
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| CN107254793A (en) * | 2017-08-08 | 2017-10-17 | 山西强伟纸业有限公司 | A kind of production technology of high-cleanness, high protecting paper of gypsum board |
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| CN105951490A (en) * | 2016-04-26 | 2016-09-21 | 玖龙纸业(天津)有限公司 | Novel high-whiteness-surface kraft cardboard production process |
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| CN107254793A (en) * | 2017-08-08 | 2017-10-17 | 山西强伟纸业有限公司 | A kind of production technology of high-cleanness, high protecting paper of gypsum board |
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