CN114134760A - Production method of smooth grey board - Google Patents
Production method of smooth grey board Download PDFInfo
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- CN114134760A CN114134760A CN202111385451.8A CN202111385451A CN114134760A CN 114134760 A CN114134760 A CN 114134760A CN 202111385451 A CN202111385451 A CN 202111385451A CN 114134760 A CN114134760 A CN 114134760A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- 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
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/08—Mechanical or thermomechanical pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
-
- 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
-
- 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
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
-
- 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
- D21H21/18—Reinforcing agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
-
- 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
Abstract
A production method of a smooth grey board relates to the technical field of papermaking, and the adopted technical scheme comprises the steps of S1 pulping, preparing surface pulp, short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler, S2 pulp proportioning, preparing surface layer pulp, core layer pulp and bottom layer pulp, and S3 forming the surface layer pulp, the core layer pulp and the bottom layer pulp respectively and then forming the surface layer pulp, the core layer pulp and the bottom layer pulp sequentially through bonding, squeezing, pre-drying, semi-dry gloss squeezing, post-drying, semi-dry calendaring, hot air drying, calendaring and reeling to form large roll paper, so that the smooth grey board base paper is obtained. The invention obtains the smooth grey paper board which has data such as whiteness and tightness similar to those of the single-sided white paper board, smoothness far higher than that of the single-sided white paper board and glossiness similar to matte coated paper, has simple process and cost only equal to 1/3-3/4 of the single-sided white paper board and the coated paper board, and is suitable for middle and low end printing and packaging markets.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for producing a smooth grey board.
Background
In the printing and packaging markets, the common glossy paper mainly comprises single-sided white paper boards and coated paper. The bottom surface of the single-sided white paperboard is rough gray, the front surface of the single-sided white paperboard is smooth and glossy white, and after the front surface of the single-sided white paperboard is subjected to color printing, the single-sided white paperboard is often used for manufacturing various high-grade paper boxes and cartons; both the bottom surface and the front surface of the coated paper are smooth and glossy white surfaces, and the coated paper is usually used for manufacturing exquisite book covers after being subjected to color printing. After a layer of coated paper is mounted on the surface of the gray paperboard, the gray paperboard can also be used for manufacturing various beautiful paper boxes and paper boxes after being subjected to color printing. However, when the single-sided white paperboard, the coated paper and the laminated gray paperboard are applied to the medium-low end printing and packaging markets, the problem of high manufacturing cost still exists, and the application range of the single-sided white paperboard, the coated paper and the laminated gray paperboard is limited. In the middle and low end printing and packaging markets, a paperboard with excellent quality, low cost and wide application range is lacked.
Disclosure of Invention
Aiming at the problem that a paperboard with excellent quality, low cost and wide application range is lacked in the middle and low end printing and packaging markets in the prior art, the invention provides a production method of a smooth grey paperboard.
The invention provides the following technical scheme: a method of producing a glossy gray paperboard comprising the steps of:
s1, pulping;
pulping the recycled book and magazine paper, white paper edges and old newspaper according to a proportion, and preparing face pulp;
pulping the recycled book and magazine paper, the pit paperboard and the general paper according to a proportion, and grading to prepare short fiber pulp and long fiber pulp;
preparing the recovered wood waste into thermomechanical pulp;
preparing a filler raw material into a papermaking filler;
s2, preparing slurry;
mixing the surface pulp and the short fiber pulp according to the mass ratio of (80-100) to (0-20) to obtain surface layer pulp;
mixing short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler according to the mass ratio of (20-50) to (10-70) to (5-20) to obtain core layer pulp;
mixing the surface pulp and the short fiber pulp according to the mass ratio of (80-100) to (0-20) to obtain bottom layer pulp;
and S3, forming the surface layer, the core layer and the bottom layer respectively, and then sequentially carrying out bonding, squeezing, pre-drying, semi-dry gloss squeezing, post-drying, semi-dry press polishing, hot air drying, press polishing and reeling to form large roll paper to obtain the smooth grey paperboard base paper.
Preferably, in step S1, the mass ratio of the recycled magazine paper, the white paper edge and the old newspaper is (30-80): 10-40): 10-30; the mass ratio of the recycled book and magazine paper to the pit paperboard to the bulk paper is (30-50): 30-40): 10-30); the wood waste comprises at least one of agriculture and forestry residues, waste building templates and waste gas wood packing boxes; the filler raw materials comprise at least two of recovered papermaking white mud, papermaking sludge and primary kaolin.
Preferably, in step S1, the recycled books, magazines, white paper edges and old newspapers are used as raw materials, and after pulping, high-concentration desanding, coarse screening, low-concentration heavy desanding, fine screening, concentration, thermal dispersion and pulp grinding, surface pulp is prepared; taking recycled book and magazine paper, pit paperboard and general-purpose paper as raw materials, sequentially carrying out pulping, high-concentration desanding, coarse screening, medium-concentration desanding and classification to obtain short fiber pulp and long fiber pulp, concentrating the short fiber pulp to obtain short fiber pulp, and concentrating the long fiber pulp to obtain long fiber pulp; the method comprises the following steps of taking wood waste as a raw material, and obtaining thermomechanical pulp after chipping, crushing, washing, screening, preheating, cooking, thermomechanical grinding, grading and concentrating; and dispersing and removing impurities of various fillers respectively, and then mixing, primary screening, secondary screening and desanding to obtain the papermaking filler.
Preferably, in the step S2, the concentration of the surface layer slurry is 2.5-5.0 wt%, the beating degree is 25-60 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8; the concentration of the core layer slurry is 3.0-5.0 wt%, the beating degree is 25-60 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8; the concentration of the bottom layer slurry is 2.5-5.0 wt%, the beating degree is 25-65 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8.
Preferably, in the molding process of step S3, the surface layer accounts for 5-20% of the total basis weight, the core layer accounts for 60-90% of the total basis weight, and the bottom layer accounts for 5-20% of the total basis weight; adding a polyacrylamide dry strength agent and modified starch into the core layer, wherein the dosage of the polyacrylamide dry strength agent accounts for 0.5-3.0 wt% of the total weight of the smooth grey board, and the modified starch is enzyme modified starch or cationic starch and accounts for 0.5-3.0 wt% of the total weight of the smooth grey board.
Preferably, in the bonding process of step S3, spraying an adhesive on one side of the core layer facing the surface layer and the bottom layer by a spraying device, and bonding the surface layer, the core layer and the bottom layer two by two in sequence to form a wet paper web of the smooth gray board; the adhesive is a mixed solution prepared from starch, polyvinyl alcohol, epoxy chloropropane resin and polyacrylamide according to the mass ratio of (80-90) to (0-10), the dosage of the adhesive accounts for 0.5-2.5 wt% of the total weight of the smooth grey board, and the starch is native starch, oxidized starch, enzyme modified starch or cationic starch.
Preferably, in the dewatering and pressing process of the step S3, the height of the blind hole roller is 0.10-0.80 mm, the height of the vacuum roller is 0.10-0.70 mm, the height of the rubber roller is 0.10-0.90 mm, and the pressure of a working line is 10-200 kN/m; the height value of the rubber roller for gloss squeezing is 0.10-0.90 mm, the stone roller is made of natural granite, the roller surface is in a mirror surface or semi-mirror surface state, and the working line pressure is less than or equal to 80 kN/m.
Preferably, in the semi-gloss pressing procedure in the step S3, the upper roller is a rubber roller, and the height of the rubber roller is 0.10-0.90 mm; the lower roller is a gloss drying cylinder, the roughness is 0.02-0.08 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing surface is 0.10-0.80 MPa, and the pressure of the steam introduced into the gloss drying cylinder is more than or equal to 500 kPa.
Preferably, in the semi-drying press finishing and hot air drying process in the step S3, the upper roller is a rubber roller, and the medium-high value is 0.10-0.90 mm; the lower roller is a gloss drying cylinder, the roughness is 0.02-0.08 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing surface is 0.10-0.80 MPa, and the pressure of the steam introduced into the gloss drying cylinder is more than or equal to 500 kPa.
Preferably, in the calendering process of the step S3, the calender is a two-roll hard calender or soft calender, the height of the roll is 0.10-0.90 mm, and the working line pressure is 10-200 kN/m.
The invention has the beneficial effects that: the recycled waste paper raw materials, the wood waste materials and the fillers are adopted as raw materials, after treatment, a smooth surface grey board which has data of whiteness, tightness and the like close to that of a single-surface white board and smoothness far higher than that of the single-surface white board and glossiness close to matte type coated paper is obtained, the process is simple, the cost is only 1/3-3/4 of the single-surface white board and the coated paper, and the method is suitable for medium and low end printing and packaging markets.
Drawings
FIG. 1 is a flow diagram of one embodiment of the present invention for making a batter.
FIG. 2 is a flow diagram of one embodiment of the present invention for making fluff pulp and fluff pulp.
FIG. 3 is a flow diagram of one embodiment of the present invention for preparing thermomechanical pulp.
FIG. 4 is a flow diagram of one embodiment of the present invention for making a papermaking filler.
FIG. 5 is a flow chart showing an example of the forming, pressing and other steps in the present invention.
Reference numerals: 1-a surface layer forming section, 2-a core layer forming section, 3-a bottom layer forming section, 4-a first spray device, 5-a second spray device, 6-a first press section, 61-a top press roll, 62-a bottom press roll, 7-a second press section, 8-a gloss press section, 9-a front drying section, 91-a # 1 dryer, 911-a first spray device, 92-a # 2 dryer, 921-a second spray device, 93-a # 3 dryer, 931-a third spray device, 10-a semi-dry gloss press section, 101-a top roll, 102-a bottom roll, 103-a fourth spray device, 104-a fifth spray device, 105-a sixth spray device, 11-a rear drying section, 12-a semi-dry calender, 121-a semi-dry top roll, 122-half-dry calendering lower roller, 123-seventh spraying device, 124-eighth spraying device, 125-ninth spraying device, 13-hot air dryer, 14-calender, 15-scanning device and 16-coiling part.
Detailed Description
The embodiments of the present invention will be described in more detail with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement the embodiments of the present invention after studying the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method of producing a glossy gray paperboard, as shown in fig. 1-5, comprising the steps of:
s1 pulping
Preparing flour paste: conveying recovered waste paper with 80 wt% of books and magazines paper, 10 wt% of white paper edges and 10 wt% of old newspapers into a hydrapulper for pulping, treating obtained paper pulp by a high-concentration sand remover, a coarse screen, a low-concentration heavy-weight sand remover, a fine screen, a multi-disc thickener, a thermal dispersion system and a refiner in sequence, and then feeding the treated paper pulp into a face pulp tank to obtain face pulp.
Preparing short fiber pulp and long fiber pulp: conveying recycled waste paper with 50 wt% of book and magazine paper, 40 wt% of pit paperboard and 10 wt% of general cargo paper into a drum pulper for pulping, sequentially conveying paper pulp into a high-concentration desander, a coarse screen and a medium-concentration desander for impurity removal, and grading the paper pulp into short fiber pulp and long fiber pulp by utilizing a grading screen; feeding the short fiber pulp into a short fiber multi-disc thickener and a short fiber pulp tank to obtain short fiber pulp; the long fiber slurry passes through a low-concentration heavy sand remover, a fine screen, a long fiber multi-disc thickener and a long fiber slurry pool in sequence to obtain the long fiber slurry.
Preparing thermomechanical pulp: chipping and crushing recycled agriculture and forestry residues, waste building templates and waste wood packaging box raw materials into wood chips with the length of 20-60 mm, the width of 20-40 mm and the thickness of 5-20 mm, washing, screening, conveying the wood chips to a preheating bin by using a bucket elevator for preheating, conveying the wood chips to a cooking cylinder by using a wood plug screw conveyor for cooking after preheating, conveying the wood chips to a defibrination machine by using an unloading screw conveyor for defibrination after cooking, and obtaining paper pulp; the paper pulp enters a discharge tank through a spraying bin, enters an inclined-net thickener for concentration after impurities are removed by a grading sieve, and finally enters a pulp storage tank for buffering to obtain the thermomechanical pulp.
Preparing a papermaking filler: and respectively and sequentially dispersing the recovered pasty papermaking white mud and the pasty papermaking sludge through a dispersion tank and screening by using a vibrating screen to obtain two types of coarse pulp, mixing the two types of coarse pulp in a mixing tank, removing impurities through a first-stage cylindrical screen, a second-stage cylindrical screen and a sand remover, and then feeding into a storage tank to obtain the papermaking filler.
S2, preparing slurry
The surface pulp and the short fiber pulp are mixed according to the mass ratio of 100:0 to obtain surface layer pulp, the concentration of which is 3.5 percent, the beating degree of which is 35 DEG SR, the wet weight of the fiber is 2.9 g, and the pH value is 7.5. Mixing short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler according to the mass ratio of 30:50:10:10 to obtain core layer pulp, wherein the concentration of the core layer pulp is 3.5%, the beating degree is 50 DEG SR, the wet weight is 2.7 g, and the pH value is 7.5. The surface pulp and the short fiber pulp are mixed according to the mass ratio of 100:0 to obtain bottom layer pulp, the concentration of which is 3.5%, the beating degree of which is 35 DEG SR, the wet weight of the fiber is 2.9 g, and the pH value is 7.5.
S31, forming
The total weight of the smooth grey board is 250 g/m2. Feeding the surface layer slurry into a surface layer forming part 1 of a paper machine to obtain a surface layer of the smooth gray paperboard, wherein the surface layer ration is 30 g/m2. Feeding the core layer slurry into a core layer forming part 2 of a paper machine to obtain a core layer of the smooth gray paperboard, wherein the core layer ration is 190 g/m2And adding 20 kg of polyacrylamide dry strength agent and 15 kg of modified starch into the core layer per ton of paper. Feeding the bottom layer pulp into a bottom layer forming part 3 of a paper machine to obtain a bottom layer of a smooth gray paperboard, wherein the bottom layer has a basis weight of 30 g/m2。
S32, bonding
As shown in fig. 5, a first spraying device 4 is provided between the core layer forming section 2 and the surface layer forming section 1, and sprays an adhesive onto the core layer of the smooth surface gray cardboard, so that the core layer and the surface layer are bonded to each other under the extrusion of the core layer forming section 2 and the surface layer forming section 1. And a second spraying device 5 is arranged between the bottom layer forming part 3 and the core layer forming part 2, the adhesive is sprayed towards the core layer through the second spraying device, and the bottom layer is adhered to the core layer under the extrusion of the bottom layer forming part 3 and the surface layer forming part 1. And bonding the surface layer, the core layer and the bottom layer to obtain the smooth grey paperboard wet paper web. The adhesive is a mixed solution prepared from starch, polyvinyl alcohol, epoxy chloropropane resin and polyacrylamide according to a mass ratio of 80:5:5: 10; the binder was added in an amount of 20 kg per ton of paper.
S33, squeezing
Dewatering press is first performed. The wet paper web is sent to the first press section 6 and the second press section 7 to be press-dewatered, thereby increasing the tightness of the plain gray board. The first and second press sections each include an upper press roll 61 and a lower press roll 62. The upper roll of the first pressing part 6 is a blind hole roll, the lower roll of the first pressing part is a vacuum roll or a rubber roll, and the upper roll and the lower roll of the second pressing part 7 are both large-roll-diameter blind hole rolls, wherein the middle height values of the blind hole rolls and the large-roll-diameter blind hole rolls are 0.10-0.80 mm, the middle height value of the vacuum roll is 0.10-0.70 mm, the middle height value of the rubber roll is 0.10-0.90 mm, and the pressure of a working line is 10-200 kN/m.
After the completion of the dewatering press, the wet paper web is further fed to the gloss press section 8 to be subjected to gloss press, and further subjected to press dewatering. The gloss press part 8 comprises a rubber roller and a stone roller and is used for improving the tightness, smoothness and gloss of the smooth grey board, wherein the middle-high value of the rubber roller is 0.58 mm, the stone roller is made of natural granite, the roller surface is in a mirror surface or semi-mirror surface state, and the pressure of a working line is 25 kN/m.
S34, pre-drying
After the gloss pressing is completed, the wet paper web is passed into a double wire-hanging arrangement dryer of the front drying section 9 for dewatering and drying. The No. 1 drying cylinder 91 of the front drying part 9 is provided with a first spraying device 911 for spraying a stripping agent to the cylinder surface of the No. 1 drying cylinder; the 2# drying cylinder 92 is provided with a second spraying device 921 for spraying a stripping agent to the cylinder surface of the 2# drying cylinder; the 3# drying cylinder 93 is provided with a third spraying device 931 for spraying the peeling agent to the cylinder surface of the 3# drying cylinder. The release agent is used for preventing wet paper from sticking to a cylinder, and polymer wax, mineral oil, vegetable oil, organic silicon or polyether dispersant and the like can be used.
S35, semi-dry gloss pressing
After pre-drying, the wet web is substantially formed from a smooth surface of gray cardboard and then sent to the semi-dry gloss press 10. The semi-dry gloss press section 10 includes an upper roll 101, a lower roll 102, fourth and fifth spraying devices 103 and 104 disposed between the semi-dry gloss press section 10 and the front drying section 9 and located at both sides of the glossy gray board, a sixth spraying device 105 for spraying a peeling agent to the lower roll 102, a pressurizing table, and a steam system for introducing steam to the lower roll 102. The upper roller 101 is a rubber roller, and the middle-high value is 0.90 mm; the lower roller 102 is a gloss drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the gauge pressure of the pressurization meter is 0.80 MPa; the steam pressure of the gloss dryer is 600 kPa.
Hot water is sprayed to both sides of the smooth gray board by the fourth spraying device 103 and the fifth spraying device 104 for wetting before entering the semi-dry gloss press section 10; the glossy cylinder is sprayed with a release agent by a sixth spray device 105 to increase the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry gloss press section 10.
S36, post-drying
After the semi-dry gloss press is completed, the glossy gray board enters the post-drying section 11 for dehydration and drying. The after-drying section 11 comprises double wire-cloth cylinders.
S37, semi-dry calendering and hot air drying
After the post-drying is completed, the glossy gray board enters the semi-dry calender 12. The semi-dry calender 12 includes a semi-dry calender upper roll 121, a semi-dry calender lower roll 122, seventh and eighth spraying devices 123 and 124 disposed between the semi-dry calender 12 and the rear drying part 11 and at both sides of the glossy gray board, respectively, a ninth spraying device 125 for spraying a peeling agent to the semi-dry calender lower roll 122, a pressurizing table, and a steam system for inputting steam to the semi-dry calender lower roll. The upper half-dry calendering roller 121 is a rubber roller with a middle-high value of 0.90 mm; the semi-dry calendaring lower roller 122 is a glossy drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing meter is 0.50 MPa, and the steam pressure of the gloss drying cylinder is 600 kPa;
before entering the semi-dry calender 12, both sides of the paperboard are wet by hot water spray through a seventh spray device 123 and an eighth spray device 124 for wetting the paper surface; the gloss cylinder is sprayed with a release agent by a ninth spray device 125 to improve the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry calender 12.
After the semi-dry calendering is completed, the glossy gray board is dried by a hot air dryer 13.
S38, calendering
After the hot air drying is completed, the glossy gray board enters a calender 14 for calendering and finishing, so that the tightness, smoothness and glossiness of the glossy gray board are improved. The calender 14 is a soft calender comprising two controlled medium high thermo rolls with a line pressure of 60 kN/m and a temperature of 120 c.
S39, winding
After calendering, the smooth grey board passes through a scanning device 15 to detect various indexes, and then enters a coiling part 16 to form large coil paper, and the obtained quantitative amount is 250 g/m2The tightness degree is 0.70 g/cm3ISO whiteness 52.5%, smoothness 30S, glossiness 18%, moisture 8.0%, interlayer bonding force 280J/m2The glossy gray paperboard base paper.
Example 2
A method of producing a glossy gray paperboard comprising the steps of:
s1 pulping
Preparing flour paste: and conveying the recovered waste paper with 70 wt% of book and magazine paper, 20 wt% of white paper and 10 wt% of old newspaper into a hydrapulper for pulping, treating the obtained paper pulp by a high-concentration sand remover, a coarse screen, a low-concentration heavy-weight sand remover, a fine screen, a multi-disc thickener, a thermal dispersion system and a refiner in sequence, and then feeding the treated paper pulp into a face pulp tank to obtain face pulp.
Preparing short fiber pulp and long fiber pulp: conveying recycled waste paper with 40 wt% of book and magazine paper, 30 wt% of pit paperboard and 30 wt% of general cargo paper into a drum pulper for pulping, sequentially conveying paper pulp into a high-concentration desander, a coarse screen and a medium-concentration desander for impurity removal, and grading the paper pulp into short fiber pulp and long fiber pulp by utilizing a grading screen; feeding the short fiber pulp into a short fiber multi-disc thickener and a short fiber pulp tank to obtain short fiber pulp; the long fiber slurry passes through a low-concentration heavy sand remover, a fine screen, a long fiber multi-disc thickener and a long fiber slurry pool in sequence to obtain the long fiber slurry.
Preparing thermomechanical pulp: chipping and crushing recycled agriculture and forestry residues, waste building templates and waste wood packaging box raw materials into wood chips with the length of 20-60 mm, the width of 20-40 mm and the thickness of 5-20 mm, washing, screening, conveying the wood chips to a preheating bin by using a bucket elevator for preheating, conveying the wood chips to a cooking cylinder by using a wood plug screw conveyor for cooking after preheating, conveying the wood chips to a defibrination machine by using an unloading screw conveyor for defibrination after cooking, and obtaining paper pulp; the paper pulp enters a discharge tank through a spraying bin, enters an inclined-net thickener for concentration after impurities are removed by a grading sieve, and finally enters a pulp storage tank for buffering to obtain the thermomechanical pulp.
Preparing a papermaking filler: and respectively and sequentially dispersing the recovered pasty papermaking white mud and the pasty papermaking sludge through a dispersion tank and screening by using a vibrating screen to obtain two types of coarse pulp, mixing the two types of coarse pulp in a mixing tank, removing impurities through a first-stage cylindrical screen, a second-stage cylindrical screen and a sand remover, and then feeding into a storage tank to obtain the papermaking filler.
S2, preparing slurry
The surface pulp and the short fiber pulp are mixed according to the mass ratio of 80:20 to obtain surface layer pulp, the concentration of which is 3.5%, the beating degree of which is 32 DEG SR, the wet weight of the fiber is 2.6 g, and the PH value is 7.8. Mixing short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler according to the mass ratio of 30:40:15:15 to obtain core layer pulp, wherein the concentration of the core layer pulp is 3.5%, the beating degree is 45 DEG SR, the wet weight is 2.5 g, and the pH value is 7.5. The surface pulp and the short fiber pulp are mixed according to the mass ratio of 80:20 to obtain bottom layer pulp, the concentration of which is 3.5%, the beating degree of which is 32 DEG SR, the wet weight of the fiber is 2.6 g, and the PH value is 7.8.
S31, forming
The total weight of the smooth grey board is 300 g/m2. Feeding the surface layer slurry into a surface layer forming part 1 of a paper machine to obtain a surface layer of the smooth grey board, wherein the surface layer has the basis weight of 32 g/m2. Feeding the core layer slurry into the core layer forming section 2 of the paper machine to obtain a core layer of smooth grey board with a core layer basis weight of 236 g/m2And adding 20 kg of polyacrylamide dry strength agent and 15 kg of modified starch into the core layer per ton of paper.Feeding the bottom layer pulp into a bottom layer forming part 3 of a paper machine to obtain a bottom layer of a smooth gray paperboard, wherein the bottom layer has the basis weight of 32 g/m2。
S32, bonding
As shown in fig. 5, a first spraying device 4 is provided between the core layer forming section 2 and the surface layer forming section 1, and sprays an adhesive onto the core layer B of the glossy gray board, so that the core layer and the surface layer are bonded to each other under the extrusion of the core layer forming section 2 and the surface layer forming section 1. And a second spraying device 5 is arranged between the bottom layer forming part 3 and the core layer forming part 2, the adhesive is sprayed towards the core layer through the second spraying device, and the bottom layer and the core layer are bonded under the extrusion of the bottom layer forming part 3 and the surface layer forming part 1. And bonding the surface layer, the core layer and the bottom layer to obtain the smooth grey paperboard wet paper web. The adhesive is a mixed solution prepared from starch, polyvinyl alcohol, epoxy chloropropane resin and polyacrylamide according to a mass ratio of 80:5:5: 10; the binder was added in an amount of 20 kg per ton of paper.
S33, squeezing
Dewatering press is first performed. The wet paper web is sent to the first press section 6 and the second press section 7 to be press-dewatered, thereby increasing the tightness of the plain gray board. The first and second press sections each include an upper press roll 61 and a lower press roll 62. The upper roll of the first pressing part 6 is a blind hole roll, the lower roll of the first pressing part is a vacuum roll or a rubber roll, and the upper roll and the lower roll of the second pressing part 7 are both large-roll-diameter blind hole rolls, wherein the middle height values of the blind hole rolls and the large-roll-diameter blind hole rolls are 0.10-0.80 mm, the middle height value of the vacuum roll is 0.10-0.70 mm, the middle height value of the rubber roll is 0.10-0.90 mm, and the pressure of a working line is 10-200 kN/m.
After the completion of the dewatering press, the wet paper web is further fed to the gloss press section 8 to be subjected to gloss press, and further subjected to press dewatering. The gloss press part 8 comprises a rubber roller and a stone roller and is used for improving the tightness, smoothness and gloss of the smooth grey board, wherein the middle-high value of the rubber roller is 0.58 mm, the stone roller is made of natural granite, the roller surface is in a mirror surface or semi-mirror surface state, and the pressure of a working line is 25 kN/m.
S34, pre-drying
After the gloss pressing is completed, the wet paper web is passed into a double wire-hanging arrangement dryer of the front drying section 9 for dewatering and drying. The No. 1 drying cylinder 91 of the front drying part 9 is provided with a first spraying device 911 for spraying a stripping agent to the cylinder surface of the No. 1 drying cylinder; the 2# drying cylinder 92 is provided with a second spraying device 921 for spraying a stripping agent to the cylinder surface of the 2# drying cylinder; the 3# drying cylinder 93 is provided with a third spraying device 931 for spraying the peeling agent to the cylinder surface of the 3# drying cylinder. The release agent is used for preventing wet paper from sticking to a cylinder, and polymer wax, mineral oil, vegetable oil, organic silicon or polyether dispersant and the like can be used.
S35, semi-dry gloss pressing
After pre-drying, the wet web is substantially formed from a smooth surface of gray cardboard and then sent to the semi-dry gloss press 10. The semi-dry gloss press section 10 includes an upper roll 101, a lower roll 102, fourth and fifth spraying devices 103 and 104 disposed between the semi-dry gloss press section 10 and the front drying section 9 and located at both sides of the glossy gray board, a sixth spraying device 105 for spraying a peeling agent to the lower roll 102, a pressurizing table, and a steam system for introducing steam to the lower roll 102. The upper roller 101 is a rubber roller, and the middle-high value is 0.90 mm; the lower roller 102 is a gloss drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the gauge pressure of the pressurization meter is 0.80 MPa; the steam pressure of the gloss dryer is 600 kPa.
Hot water is sprayed to both sides of the smooth gray board by the fourth spraying device 103 and the fifth spraying device 104 for wetting before entering the semi-dry gloss press section 10; the glossy cylinder is sprayed with a release agent by a sixth spray device 105 to increase the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry gloss press section 10.
S36, post-drying
After the semi-dry gloss press is completed, the glossy gray board enters the post-drying section 11 for dehydration and drying. The after-drying section 11 comprises double wire-cloth cylinders.
S37, semi-dry calendering and hot air drying
After the post-drying is completed, the glossy gray board enters the semi-dry calender 12. The semi-dry calender 12 includes a semi-dry calender upper roll 121, a semi-dry calender lower roll 122, seventh and eighth spraying devices 123 and 124 disposed between the semi-dry calender 12 and the rear drying part 11 and at both sides of the glossy gray board, respectively, a ninth spraying device 125 for spraying a peeling agent to the semi-dry calender lower roll 122, a pressurizing table, and a steam system for inputting steam to the semi-dry calender lower roll. The upper half-dry calendering roller 121 is a rubber roller with a middle-high value of 0.90 mm; the semi-dry calendaring lower roller 122 is a glossy drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing meter is 0.50 MPa, and the steam pressure of the gloss drying cylinder is 600 kPa;
before entering the semi-dry calender 12, both sides of the paperboard are wet by hot water spray through a seventh spray device 123 and an eighth spray device 124 for wetting the paper surface; the gloss cylinder is sprayed with a release agent by a ninth spray device 125 to improve the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry calender 12.
After the semi-dry calendering is completed, the glossy gray board is dried by a hot air dryer 13.
S38, calendering
After the hot air drying is completed, the glossy gray board enters a calender 14 for calendering and finishing, so that the tightness, smoothness and glossiness of the glossy gray board are improved. The calender 14 is a soft calender comprising two controlled medium high thermo rolls with a line pressure of 60 kN/m and a temperature of 120 c.
S39, winding
After calendering, the smooth grey board passes through a scanning device 15 to detect various indexes, and then enters a coiling part 16 to form large coil paper, and the obtained quantitative amount is 300 g/m2The tightness degree is 0.65 g/cm355.3% of ISO whiteness, 28S smoothness, 20% of glossiness, 8.5% of water and 250J/m of interlayer bonding force2The glossy gray paperboard base paper.
Example 3
A method of producing a glossy gray paperboard comprising the steps of:
s1 pulping
Preparing flour paste: the method comprises the steps of conveying recycled waste paper with 60 wt% of book and magazine paper, 20 wt% of white paper and 20 wt% of old newspaper into a hydrapulper for pulping, treating obtained paper pulp through a high-concentration desander, a coarse screen, a low-concentration heavy-weight desander, a fine screen, a multi-disc thickener, a thermal dispersion system and a refiner in sequence, and then feeding the treated paper pulp into a face pulp tank to obtain face pulp.
Preparing short fiber pulp and long fiber pulp: conveying recycled waste paper with 50 wt% of book and magazine paper, 30 wt% of pit paperboard and 20 wt% of general cargo paper into a drum pulper for pulping, sequentially conveying paper pulp into a high-concentration desander, a coarse screen and a medium-concentration desander for impurity removal, and grading the paper pulp into short fiber pulp and long fiber pulp by utilizing a grading screen; feeding the short fiber pulp into a short fiber multi-disc thickener and a short fiber pulp tank to obtain short fiber pulp; the long fiber slurry passes through a low-concentration heavy sand remover, a fine screen, a long fiber multi-disc thickener and a long fiber slurry pool in sequence to obtain the long fiber slurry.
Preparing thermomechanical pulp: chipping and crushing recycled agriculture and forestry residues, waste building templates and waste wood packaging box raw materials into wood chips with the length of 20-60 mm, the width of 20-40 mm and the thickness of 5-20 mm, washing, screening, conveying the wood chips to a preheating bin by using a bucket elevator for preheating, conveying the wood chips to a cooking cylinder by using a wood plug screw conveyor for cooking after preheating, conveying the wood chips to a defibrination machine by using an unloading screw conveyor for defibrination after cooking, and obtaining paper pulp; the paper pulp enters a discharge tank through a spraying bin, enters an inclined-net thickener for concentration after impurities are removed by a grading sieve, and finally enters a pulp storage tank for buffering to obtain the thermomechanical pulp.
Preparing a papermaking filler: and respectively and sequentially dispersing the recovered pasty papermaking white mud and the pasty papermaking sludge through a dispersion tank and screening by using a vibrating screen to obtain two types of coarse pulp, mixing the two types of coarse pulp in a mixing tank, removing impurities through a first-stage cylindrical screen, a second-stage cylindrical screen and a sand remover, and then feeding into a storage tank to obtain the papermaking filler.
S2, preparing slurry
The surface pulp and the short fiber pulp are mixed according to the mass ratio of 90:10 to obtain surface layer pulp, the concentration of the surface layer pulp is 3.5%, the beating degree is 32 DEG SR, the wet weight of the fiber is 2.6 g, and the PH value is 7.8. Mixing short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler according to the mass ratio of 20:50:20:10 to obtain core layer pulp, wherein the concentration of the core layer pulp is 3.5%, the beating degree is 45 DEG SR, the wet weight is 2.5 g, and the pH value is 7.5. The surface pulp and the short fiber pulp are mixed according to the mass ratio of 90:10 to obtain bottom layer pulp, the concentration of the bottom layer pulp is 3.5%, the beating degree is 32 DEG SR, the wet weight of the fiber is 2.6 g, and the PH value is 7.8.
S31, forming
The total weight of the smooth grey board is 400 g/m2. Feeding the surface layer slurry into a surface layer forming part 1 of a paper machine to obtain a surface layer of the smooth gray paperboard, wherein the surface layer ration is 35 g/m2. Feeding the core layer slurry into a core layer forming part 2 of a paper machine to obtain a core layer of the smooth gray paperboard, wherein the core layer has the basis weight of 330 g/m2And 30 kg of polyacrylamide dry strength agent per ton of paper and 20 kg of modified starch per ton of paper are added into the core layer. Feeding the bottom layer pulp into a bottom layer forming part 3 of a paper machine to obtain a bottom layer of a smooth gray paperboard, wherein the bottom layer has the basis weight of 35 g/m2。
S32, bonding
As shown in fig. 5, a first spraying device 4 is provided between the core layer forming section 2 and the surface layer forming section 1, and sprays an adhesive onto the core layer of the smooth surface gray cardboard, so that the core layer and the surface layer are bonded to each other under the extrusion of the core layer forming section 2 and the surface layer forming section 1. And a second spraying device 5 is arranged between the bottom layer forming part 3 and the core layer forming part 2, the adhesive is sprayed towards the core layer through the second spraying device, and the bottom layer and the core layer are bonded under the extrusion of the bottom layer forming part 3 and the surface layer forming part 1. And bonding the surface layer, the core layer and the bottom layer to obtain the smooth grey paperboard wet paper web. The adhesive is a mixed solution prepared from starch, polyvinyl alcohol, epoxy chloropropane resin and polyacrylamide according to a mass ratio of 80:5:5: 10; the binder was added in an amount of 20 kg per ton of paper.
S33, squeezing
Dewatering press is first performed. The wet paper web is sent to the first press section 6 and the second press section 7 to be press-dewatered, thereby increasing the tightness of the plain gray board. The first and second press sections each include an upper press roll 61 and a lower press roll 62. The upper roll of the first pressing part 6 is a blind hole roll, the lower roll of the first pressing part is a vacuum roll or a rubber roll, and the upper roll and the lower roll of the second pressing part 7 are both large-roll-diameter blind hole rolls, wherein the middle height values of the blind hole rolls and the large-roll-diameter blind hole rolls are 0.10-0.80 mm, the middle height value of the vacuum roll is 0.10-0.70 mm, the middle height value of the rubber roll is 0.10-0.90 mm, and the pressure of a working line is 10-200 kN/m.
After the completion of the dewatering press, the wet paper web is further fed to the gloss press section 8 to be subjected to gloss press, and further subjected to press dewatering. The gloss press part 8 comprises a rubber roller and a stone roller and is used for improving the tightness, smoothness and gloss of the smooth grey board, wherein the middle-high value of the rubber roller is 0.58 mm, the stone roller is made of natural granite, the roller surface is in a mirror surface or semi-mirror surface state, and the pressure of a working line is 25 kN/m.
S34, pre-drying
After the gloss pressing is completed, the wet paper web is passed into a double wire-hanging arrangement dryer of the front drying section 9 for dewatering and drying. The No. 1 drying cylinder 91 of the front drying part 9 is provided with a first spraying device 911 for spraying a stripping agent to the cylinder surface of the No. 1 drying cylinder; the 2# drying cylinder 92 is provided with a second spraying device 921 for spraying a stripping agent to the cylinder surface of the 2# drying cylinder; the 3# drying cylinder 93 is provided with a third spraying device 931 for spraying the peeling agent to the cylinder surface of the 3# drying cylinder. The release agent is used for preventing wet paper from sticking to a cylinder, and polymer wax, mineral oil, vegetable oil, organic silicon or polyether dispersant and the like can be used.
S35, semi-dry gloss pressing
After pre-drying, the wet web is substantially formed from a smooth surface of gray cardboard and then sent to the semi-dry gloss press 10. The semi-dry gloss press section 10 includes an upper roll 101, a lower roll 102, fourth and fifth spraying devices 103 and 104 disposed between the semi-dry gloss press section 10 and the front drying section 9 and located at both sides of the glossy gray board, a sixth spraying device 105 for spraying a peeling agent to the lower roll 102, a pressurizing table, and a steam system for introducing steam to the lower roll 102. The upper roller 101 is a rubber roller, and the middle-high value is 0.90 mm; the lower roller 102 is a gloss drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the gauge pressure of the pressurization meter is 0.80 MPa; the steam pressure of the gloss dryer is 700 kPa.
Hot water is sprayed to both sides of the smooth gray board by the fourth spraying device 103 and the fifth spraying device 104 for wetting before entering the semi-dry gloss press section 10; the glossy cylinder is sprayed with a release agent by a sixth spray device 105 to increase the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry gloss press section 10.
S36, post-drying
After the semi-dry gloss press is completed, the glossy gray board enters the post-drying section 11 for dehydration and drying. The after-drying section 11 comprises double wire-cloth cylinders.
S37, semi-dry calendering and hot air drying
After the post-drying is completed, the glossy gray board enters the semi-dry calender 12. The semi-dry calender 12 includes a semi-dry calender upper roll 121, a semi-dry calender lower roll 122, seventh and eighth spraying devices 123 and 124 disposed between the semi-dry calender 12 and the rear drying part 11 and at both sides of the glossy gray board, respectively, a ninth spraying device 125 for spraying a peeling agent to the semi-dry calender lower roll 122, a pressurizing table, and a steam system for inputting steam to the semi-dry calender lower roll. The upper half-dry calendering roller 121 is a rubber roller with a middle-high value of 0.90 mm; the semi-dry calendaring lower roller 122 is a glossy drying cylinder, the roughness is 0.03 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing meter is 0.50 MPa, and the steam pressure of the gloss drying cylinder is 700 kPa;
before entering the semi-dry calender 12, both sides of the paperboard are wet by hot water spray through a seventh spray device 123 and an eighth spray device 124 for wetting the paper surface; the gloss cylinder is sprayed with a release agent by a ninth spray device 125 to improve the tightness, smoothness and gloss of the glossy gray board as it passes through the semi-dry calender 12.
After the semi-dry calendering is completed, the glossy gray board is dried by a hot air dryer 13.
S38, calendering
After the hot air drying is completed, the glossy gray board enters a calender 14 for calendering and finishing, so that the tightness, smoothness and glossiness of the glossy gray board are improved. The calender 14 is a soft calender comprising two controlled medium high thermo rolls with a line pressure of 60 kN/m and a temperature of 120 c.
S39, winding
After calendering, the smooth grey board passes through a scanning device 15 to detect various indexes, and then enters a coiling part 16 to form large coil paper, and the obtained quantitative amount is 400 g/m2The tightness degree is 0.65 g/cm3ISO whiteness 51.8%, smoothness 25S, glossiness 18%, moisture 8.2%, interlayer bonding force 220J/m2The glossy gray paperboard base paper.
The parameters of the glossy grey board base papers prepared in examples 1, 2 and 3 are shown in the table below.
The data of the single-sided white board in the surface is from QB/T2250-2005 single-sided white board, and the data of the coated paper is from QB/T10335.1-2005 coated paper and paperboard coated art printing paper (coated paper). Besides ISO whiteness, each data of the smooth surface gray board prepared by the method is closer to that of a single-surface white board which is commonly used for middle-high end packaging and printing, wherein the smoothness of the smooth surface gray board is far higher than that of the single-surface white board, and the glossiness of the smooth surface gray board is closer to that of matte type coated paper; in the aspect of manufacturing cost, the method is simple in process, and the cost is only 1/3-3/4 of single-sided white paper boards and coated paper. The paper with high smoothness and glossiness has the advantages of uniform ink transfer during printing, clear printed graphics and texts, strong adhesion to colors and suitability for packaging and printing.
The foregoing is a detailed description of one or more embodiments of the invention, which is set forth in more detail and is not intended to limit the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for producing smooth grey board is characterized in that: the method comprises the following steps:
s1, pulping;
pulping the recycled book and magazine paper, white paper edges and old newspaper according to a proportion, and preparing face pulp;
pulping the recycled book and magazine paper, the pit paperboard and the general paper according to a proportion, and grading to prepare short fiber pulp and long fiber pulp;
preparing the recovered wood waste into thermomechanical pulp;
preparing a filler raw material into a papermaking filler;
s2, preparing slurry;
mixing the surface pulp and the short fiber pulp according to the mass ratio of (80-100) to (0-20) to obtain surface layer pulp;
mixing short fiber pulp, long fiber pulp, thermomechanical pulp and papermaking filler according to the mass ratio of (20-50) to (10-70) to (5-20) to obtain core layer pulp;
mixing the surface pulp and the short fiber pulp according to the mass ratio of (80-100) to (0-20) to obtain bottom layer pulp;
and S3, forming the surface layer, the core layer and the bottom layer respectively, and then sequentially carrying out bonding, squeezing, pre-drying, semi-dry gloss squeezing, post-drying, semi-dry press polishing, hot air drying, press polishing and reeling to form large roll paper to obtain the smooth grey paperboard base paper.
2. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in step S1, the mass ratio of the recycled magazine paper, the white paper edge and the old newspaper is (30-80): 10-40): 10-30; the mass ratio of the recycled book and magazine paper to the pit paperboard to the bulk paper is (30-50): 30-40): 10-30); the wood waste comprises at least one of agriculture and forestry residues, waste building templates and waste gas wood packing boxes; the filler raw materials comprise at least two of recovered papermaking white mud, papermaking sludge and primary kaolin.
3. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in step S1, the recycled books and magazines, white paper edges and old newspapers are used as raw materials, and after pulping, high-concentration desanding, coarse screening, low-concentration heavy-mass desanding, fine screening, concentration, thermal dispersion and pulp grinding are sequentially carried out, the flour pulp is prepared; taking recycled book and magazine paper, pit paperboard and general-purpose paper as raw materials, sequentially carrying out pulping, high-concentration desanding, coarse screening, medium-concentration desanding and classification to obtain short fiber pulp and long fiber pulp, concentrating the short fiber pulp to obtain short fiber pulp, and concentrating the long fiber pulp to obtain long fiber pulp; the method comprises the following steps of taking wood waste as a raw material, and obtaining thermomechanical pulp after chipping, crushing, washing, screening, preheating, cooking, thermomechanical grinding, grading and concentrating; and dispersing and removing impurities of various fillers respectively, and then mixing, primary screening, secondary screening and desanding to obtain the papermaking filler.
4. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in step S2, the concentration of the surface layer slurry is 2.5-5.0 wt%, the beating degree is 25-60 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8; the concentration of the core layer slurry is 3.0-5.0 wt%, the beating degree is 25-60 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8; the concentration of the bottom layer slurry is 2.5-5.0 wt%, the beating degree is 25-65 DEG SR, the wet weight of the fiber is 2-8 g, and the pH value is 6-8.
5. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the molding process of step S3, the surface layer accounts for 5-20% of the total basis weight, the core layer accounts for 60-90% of the total basis weight, and the bottom layer accounts for 5-20% of the total basis weight; adding a polyacrylamide dry strength agent and modified starch into the core layer, wherein the dosage of the polyacrylamide dry strength agent accounts for 0.5-3.0 wt% of the total weight of the smooth grey board, and the modified starch is enzyme modified starch or cationic starch and accounts for 0.5-3.0 wt% of the total weight of the smooth grey board.
6. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the bonding procedure of step S3, spraying an adhesive on the sides of the core layer facing the surface layer and the bottom layer by a spraying device, respectively, and sequentially bonding the surface layer, the core layer and the bottom layer to form a wet paper web of the smooth gray paperboard; the adhesive is a mixed solution prepared from starch, polyvinyl alcohol, epoxy chloropropane resin and polyacrylamide according to the mass ratio of (80-90) to (0-10), the dosage of the adhesive accounts for 0.5-2.5 wt% of the total weight of the smooth grey board, and the starch is native starch, oxidized starch, enzyme modified starch or cationic starch.
7. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the dewatering and squeezing process of the step S3, the height of the blind roller is 0.10-0.80 mm, the height of the vacuum roller is 0.10-0.70 mm, the height of the rubber roller is 0.10-0.90 mm, and the pressure of the working line is 10-200 kN/m; the height value of the rubber roller for gloss squeezing is 0.10-0.90 mm, the stone roller is made of natural granite, the roller surface is in a mirror surface or semi-mirror surface state, and the working line pressure is less than or equal to 80 kN/m.
8. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the semi-gloss squeezing procedure of the step S3, the upper roller is a rubber roller, and the height of the rubber roller is 0.10-0.90 mm; the lower roller is a gloss drying cylinder, the roughness is 0.02-0.08 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing surface is 0.10-0.80 MPa, and the pressure of the steam introduced into the gloss drying cylinder is more than or equal to 500 kPa.
9. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the semi-dry calendering and hot air drying process of the step S3, the upper roller is a rubber roller, and the middle-high value is 0.10-0.90 mm; the lower roller is a gloss drying cylinder, the roughness is 0.02-0.08 mm, and the cylinder surface is in a mirror surface or semi-mirror surface state; the pressure of the pressurizing surface is 0.10-0.80 MPa, and the pressure of the steam introduced into the gloss drying cylinder is more than or equal to 500 kPa.
10. A method of producing a glossy gray board as claimed in claim 1, characterized in that: in the calendering process of the step S3, the calender is a two-roll hard calender or soft calender, the height of the roll is 0.10-0.90 mm, and the working line pressure is 10-200 kN/m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703698A (en) * | 2022-03-10 | 2022-07-05 | 浙江理工大学 | Preparation method of household paper with different grains |
| CN114875721A (en) * | 2022-06-06 | 2022-08-09 | 浙江金励环保纸业有限公司 | Bottom-exposed-free gray paperboard based on cleaning enzyme and production process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100830A (en) * | 2007-06-26 | 2008-01-09 | 方隽云 | Technique for producing sheet-type electronic component paper carrying base paper by using waste paper pulp |
| CN106087522A (en) * | 2016-07-29 | 2016-11-09 | 联盛纸业（龙海）有限公司 | A kind of production method of ash-rich height thickness chipboard |
| CN106948208A (en) * | 2017-03-09 | 2017-07-14 | 华南理工大学 | A kind of environmentally friendly light basis weight coated duplex board with grey back and preparation method thereof |
| CN110080031A (en) * | 2019-05-27 | 2019-08-02 | 联盛纸业（龙海）有限公司 | A kind of production technology of the compound dedicated core paper of advanced grey board |
| CN112064421A (en) * | 2020-09-16 | 2020-12-11 | 联盛纸业（龙海）有限公司 | Dyed grey board paper and production process thereof |
| CN112359636A (en) * | 2020-11-02 | 2021-02-12 | 开平市易大丰纸业有限公司 | Preparation method of grey paperboard |
| CN113584930A (en) * | 2021-07-15 | 2021-11-02 | 东莞市金田纸业有限公司 | Grey paperboard production equipment and production method thereof |
| CN113622210A (en) * | 2021-08-23 | 2021-11-09 | 浙江金励环保纸业有限公司 | Pulp mixing method of grey paperboard |
-
2021
- 2021-11-22 CN CN202111385451.8A patent/CN114134760B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100830A (en) * | 2007-06-26 | 2008-01-09 | 方隽云 | Technique for producing sheet-type electronic component paper carrying base paper by using waste paper pulp |
| CN106087522A (en) * | 2016-07-29 | 2016-11-09 | 联盛纸业（龙海）有限公司 | A kind of production method of ash-rich height thickness chipboard |
| CN106948208A (en) * | 2017-03-09 | 2017-07-14 | 华南理工大学 | A kind of environmentally friendly light basis weight coated duplex board with grey back and preparation method thereof |
| CN110080031A (en) * | 2019-05-27 | 2019-08-02 | 联盛纸业（龙海）有限公司 | A kind of production technology of the compound dedicated core paper of advanced grey board |
| CN112064421A (en) * | 2020-09-16 | 2020-12-11 | 联盛纸业（龙海）有限公司 | Dyed grey board paper and production process thereof |
| CN112359636A (en) * | 2020-11-02 | 2021-02-12 | 开平市易大丰纸业有限公司 | Preparation method of grey paperboard |
| CN113584930A (en) * | 2021-07-15 | 2021-11-02 | 东莞市金田纸业有限公司 | Grey paperboard production equipment and production method thereof |
| CN113622210A (en) * | 2021-08-23 | 2021-11-09 | 浙江金励环保纸业有限公司 | Pulp mixing method of grey paperboard |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703698A (en) * | 2022-03-10 | 2022-07-05 | 浙江理工大学 | Preparation method of household paper with different grains |
| CN114875721A (en) * | 2022-06-06 | 2022-08-09 | 浙江金励环保纸业有限公司 | Bottom-exposed-free gray paperboard based on cleaning enzyme and production process thereof |
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