CN113584930B - Ash paper board production equipment and production method thereof - Google Patents

Ash paper board production equipment and production method thereof Download PDF

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Publication number
CN113584930B
CN113584930B CN202110798713.7A CN202110798713A CN113584930B CN 113584930 B CN113584930 B CN 113584930B CN 202110798713 A CN202110798713 A CN 202110798713A CN 113584930 B CN113584930 B CN 113584930B
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China
Prior art keywords
slurry
paper web
wet paper
gray
core layer
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CN113584930A (en
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袁毅
张健
陈�全
王伟杰
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Dongguan Jintian Paper Co ltd
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Dongguan Jintian Paper Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • 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

The invention relates to ash paper board production equipment and a production method thereof. The bottom layer and the surface layer of the gray paperboard adopt the same raw material proportion and the same pulp preparation process, and the same quantitative production equipment and the same pulp preparation process are adopted, so that the pulp properties of the surface layer and the bottom layer of the gray paperboard are kept consistent, the phenomenon of buckling deformation of the gray paperboard is reduced, and the quality of the surface layer and the bottom layer of the gray paperboard is improved.

Description

Ash paper board production equipment and production method thereof
Technical Field
The invention relates to the technical field of papermaking, in particular to a gray paperboard production device and a gray paperboard production method.
Background
The gray paperboard is an industrial paperboard with wide application, is commonly used for processing, box making, toy production and the like of Gao Dingliang multilayer composite paperboards, and is popular with people. It is well known that gray paperboard has high basis weight, high caliper and strict moisture control characteristics. The quantitative relation to the physical properties of the gray paperboard is also directly related to the cost; the thickness is a sensitive indicator to the gray cardboard user; the moisture is directly related to the quantification, thickness, appearance quality and subsequent processing and production of the gray paperboard.
The traditional gray paperboard production technology has the following defects: the moisture of the gray paperboard is easily affected by the inconsistent properties of the sizing agent of the surface layer and the bottom layer, so that the moisture of the surface layer and the bottom layer of the gray paperboard is inconsistent, the shrinkage degree of the surface layer and the bottom layer is inconsistent, and the phenomenon of buckling deformation is generated. The water content of the gray paperboard is easily affected by the formation of the net part, the dehydration and the drying of the squeezing part; the moisture change has a great influence on various characteristics of the paper board, and if the paper web is not well formed, the squeezing dehydration is not uniform, and the paper web generates moisture difference when drying is performed, the moisture in the gray paper board is not uniform at the moment, so that the quantification and the thickness of the gray paper board are influenced, and the buckling deformation of the gray paper board is aggravated.
Disclosure of Invention
Aiming at the defects of the existing gray paperboard production technology, the invention provides gray paperboard production equipment and a gray paperboard production method.
The ash paper board production equipment comprises a net part, a front pressing part, a pre-heating device, a rear pressing part, a front drying part, a first calender, a rear drying part, a second calender and a paper winding machine which are sequentially arranged, wherein the net part comprises a core layer net, a surface layer net and a bottom layer net, the core layer net and the surface layer net are arranged above the bottom layer net, and a top net is arranged above the core layer net; the front press part comprises two pre-press rolls and three front press rolls which are sequentially arranged, and the wet paper web of the gray paperboard is extruded and dehydrated at the front press part, so that the tightness of the paper web is improved; the pre-heating device comprises a first drying cylinder, a second drying cylinder, a third drying cylinder and a fourth drying cylinder which are sequentially arranged, and after the wet paper web of the gray paper board sequentially passes through the four drying cylinders, the temperature of the paper surface is increased; the rear press part comprises a first rear press roll and a second rear press roll, and the wet gray paperboard paper web is further extruded and dehydrated in the rear press part, so that the tightness and the glossiness of the paper web are improved; the front drying part comprises five groups of drying cylinders which are arranged in a double-hanging net manner, so that the wet paper web of the gray paper board is dehydrated and dried to form a dry paper web of the gray paper board; the post-drying part comprises a group of double-hanging net arranging drying cylinders, so that the gray paperboard dry paper web is further dehydrated and dried; the first calender and the second calender adopt roller calenders, and the dry paper web of the gray paperboard is subjected to paper surface calendering finishing on the roller calenders; the reeling cylinder in the reeling machine is a cold cylinder, and cold water is circulated in the reeling cylinder, so that the temperature of the dry paper web of the gray paper board is stabilized at 40-50 ℃, the influence of the ambient temperature on the moisture of the dry paper web is reduced, the evaporation of the moisture of the raw paper is reduced, and the moisture of the dry paper web of the gray paper board is stabilized at 6-10%.
Further, steam is introduced into the first drying cylinder, the second drying cylinder, the third drying cylinder and the fourth drying cylinder, the steam pressure in the first drying cylinder and the second drying cylinder is 10 KPa-30 KPa, the cylinder surface temperature is 50 ℃ to 60 ℃, the steam pressure in the third drying cylinder and the fourth drying cylinder is 30 KPa-50 KPa, the cylinder surface temperature is 70 ℃ to 80 ℃, and after the wet paper web of the gray paper board sequentially passes through the 4 drying cylinders, the temperature is raised from 40 ℃ to 70 ℃, so that the surface tension and the viscosity of the water in the wet paper web are reduced, the moisture content of the wet paper web is kept uniform, the dewatering capacity of the pressing and the drying capacity of each drying cylinder are improved, the dewatering uniformity of the wet paper web during pressing is improved, the moisture difference during drying is reduced, the workload of gloss pressing and calendaring performed later is reduced, the paper diseases such as edge warping and wrinkling are avoided when the wet paper web enters the drying cylinder, and the gray paper board with higher quality is beneficial to be obtained.
Further, the upper roller in the pre-pressing roller is a blind hole roller, and the lower roller is a vacuum roller or a rubber roller.
Further, the upper rolls in the front two front press rolls are blind hole rolls, and the lower rolls are vacuum rolls or rubber rolls; the last front press roller has blind hole roller.
Further, the first rear press roll is blind hole press, and the second rear press roll is stone roll press.
Further, a cooling device is arranged between the second calender and the paper winding machine, the cooling device comprises a plurality of air extractors, the air extractors are arranged above the dry paper web of the gray paper board side by side, and the heat emitted by the dry paper web of the gray paper board is extracted by rapid air extraction, so that the temperature of the dry paper web of the gray paper board is rapidly reduced to 40-50 ℃.
The invention also provides a method for producing the gray paperboard, which comprises the following steps:
(1) Pulping
The surface layer slurry raw materials are mixed according to the following mass fractions: 10-20% of old newspaper, 20-50% of book paper and 30-70% of paper cover, and preparing surface pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the following raw materials in percentage by mass: 10-20% of old newspaper, 20-50% of book paper and 30-70% of paper cover, and the bottom pulp is prepared by crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the core layer slurry raw materials according to the following mass fractions: 50-70% of paperboard and 30-50% of old cardboard paper, and after mixing, crushing, deslagging, desanding, screening, concentrating and pulping to prepare core pulp;
(2) Slurry preparation
The surface layer and bottom layer slurry are mixed according to the proportion of 1:1, mixing, adding an enhancer to prepare mixed slurry, sending half of the mixed slurry into a surface layer slurry forming pond for standby to prepare surface layer finished slurry, and sending the other half of the mixed slurry into a bottom layer slurry forming pond for standby to prepare bottom layer finished slurry, wherein the beating degree of the surface layer finished slurry and the bottom layer finished slurry is 40-85 DEG SR;
mixing the core layer slurry according to the following mass fractions: 40-70% of core layer slurry, 5-15% of filler and 15-55% of recovered slurry and/or mechanical slurry, adding a reinforcing agent after mixing, and sending the mixture into a core layer slurry forming tank for standby after preparation to prepare core layer finished product slurry, wherein the beating degree of the core layer finished product slurry is 20-55 DEG SR;
(3) Shaping
And (3) dewatering and forming the surface layer finished pulp, the bottom layer finished pulp and the core layer finished pulp on a wire part through respective headboxes, respectively manufacturing a gray paperboard surface layer wet paper web, a bottom layer wet paper web and a core layer wet paper web, and then compositing the gray paperboard surface layer wet paper web, the bottom layer wet paper web and the core layer wet paper web through the wire part, extruding and dewatering through a front pressing part, heating through a pre-heating device, extruding and dewatering through a rear pressing part, drying through a front drying part, finishing paper surfaces through a first calender, drying through a rear drying part, finishing paper surfaces through a second calender, cooling through a cooling device and reeling through a paper reeling machine, thus obtaining gray paperboard finished paper.
In the step 2, the reinforcing agent is cationic polyacrylamide, and the dosage is 20-25 kg/ton of slurry; the filler is kaolin.
Further, in the step 3, the paper making of the gray paperboard surface layer wet paper web, the bottom layer wet paper web and the core layer wet paper web is respectively carried out according to the surface layer ration of 20 g/square meter-80 g/square meter, the bottom layer ration of 20 g/square meter-80 g/square meter and the core layer ration of 210 g/square meter-840 g/square meter.
Further, before the wet paper web of the surface layer, the wet paper web of the bottom layer and the wet paper web of the core layer of the gray paper board are compounded, raw starch suspension is sprayed between the wet paper web of the surface layer and the wet paper web of the core layer and between the wet paper web of the core layer and the wet paper web of the bottom layer, the dosage of the raw starch suspension is 4-6 kg/ton pulp, and the raw starch suspension is sprayed at the joint of each layer and the layer, so that the bonding force between the layers of the gray paper board is enhanced, and the quality of the gray paper board is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the bottom layer and the surface layer of the gray paperboard adopt the same raw material proportion and the same pulp preparation process, and the same quantitative production equipment and the same pulp preparation process are adopted, so that the pulp properties of the surface layer and the bottom layer of the gray paperboard are kept consistent, the phenomenon of buckling deformation of the gray paperboard is reduced, and the appearance quality of the surface layer and the bottom layer of the gray paperboard is improved.
2. The temperature of the wet paper web of the gray paper board is increased through the pre-heating device, so that the moisture content of the banner of the wet paper web is kept uniform, the dewatering capacity of the pressing part and the drying capacity of the drying cylinder part are improved, the uniformity of dewatering of the wet paper web during pressing is improved, the moisture difference during drying is reduced, the workload of gloss pressing and calendaring performed subsequently is reduced, paper diseases such as edge warping and wrinkling are avoided when the wet paper web enters the drying cylinder, and the gray paper board with higher quality is obtained.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic view of an apparatus and method for producing gray paperboard according to the present invention.
The reference numerals shown in the figures are represented as: 1. a mesh portion; 11. a core layer web; 12. a top net; 13. a facing web; 14. a bottom layer net; 2. a front press section; 21. a pre-press roll; 22. a front press roll; 3. a pre-heating device; 31. a first dryer; 32. a second dryer; 33. a third dryer; 34. a fourth dryer; 4. a rear press section; 41. squeezing blind holes; 42. squeezing by a stone roller; 5. a front drying section; 6. a first calender; 7. a post-drying section; 8. a second calender; 9. a cooling device; 10. a reel.
Detailed Description
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The ash paper board production equipment comprises a net part 1, a front pressing part 2, a pre-heating device 3, a rear pressing part 4, a front drying part 5, a first calender 6, a rear drying part 7, a second calender 8 and a paper winding machine 10 which are sequentially arranged, wherein the net part 1 comprises a core layer net 11, a surface layer net 13 and a bottom layer net 14, the core layer net 11 and the surface layer net 13 are arranged above the bottom layer net 14, and a top net 12 is arranged above the core layer net 11; the front press part 2 comprises two pre-press rolls 21 and three front press rolls 22 which are sequentially arranged, and the wet gray paperboard paper web is extruded and dehydrated in the front press part 2, so that the tightness of the paper web is improved; the pre-heating device 3 comprises a first drying cylinder 31, a second drying cylinder 32, a third drying cylinder 33 and a fourth drying cylinder 34 which are sequentially arranged, and after the wet paper web of the gray paper board sequentially passes through the four drying cylinders, the temperature of the paper surface is increased; the rear press part 4 comprises a first rear press roll 41 and a second rear press roll 42, and the wet gray paperboard web is further extruded and dewatered in the rear press part 4, so that the tightness and glossiness of the web are improved; the front drying part 5 comprises five groups of double-hanging net arranging drying cylinders, so that the wet paper web of the gray paper board is dehydrated and dried to form a dry paper web of the gray paper board; the post-dryer section 7 comprises a series of twin wire cylinders arranged to provide further dewatering and drying of the dried web of gray paperboard.
The first calender 6 adopts the existing gray paperboard polishing mechanism (patent number: CN 212199858U), sequentially wets and dries gray paperboard, sprays atomized water on the surface of the gray paperboard, semi-wets and dries the gray paperboard, and then polishes the gray paperboard, so that the gray paperboard is polished and finished for a plurality of times with different dry and wet degrees, and the upper drying part and the lower drying part are arranged in a staggered manner to uniformly dry the gray paperboard, so that the smoothness and the glossiness of the gray paperboard are effectively improved; the second calender 8 adopts a two-roller calender, the working mode of the roller calender is usually continuous rolling, the gray paperboard is sent to a calender belt between a hot press roller and a pressing roller, under the action of temperature and pressure, a coating is attached to the surface of the calender belt to be calendered, a bright surface layer is formed after the calendered glazing layer is gradually cooled, the calender belt is a stainless steel annular steel belt subjected to special treatment, a plurality of groups of far infrared heating sources are arranged in the hot press roller to provide heat required in calendering, the pressure of the pressing roller adopts an electrohydraulic pressure regulating system, the requirement on the pressure in calendering can be accurately met, and the calendering speed can be controlled by a speed regulating driving motor or a slip motor.
Specifically, the reeling cylinder in the reeling machine 10 is a cold cylinder, cold water is circulated in the reeling cylinder, so that the temperature of the dry paper web of the gray paperboard is stabilized at 40-50 ℃, the influence of the ambient temperature on the moisture of the dry paper web is reduced, the evaporation of the moisture of the raw paper is reduced, and the moisture of the dry paper web of the gray paperboard is stabilized at 6-10%.
Preferably, steam is fed into the first drying cylinder 31, the second drying cylinder 32, the third drying cylinder 33 and the fourth drying cylinder 34, the steam pressure in the first drying cylinder 31 and the second drying cylinder 32 is 10 KPa-30 KPa, the cylinder surface temperature is 50-60 ℃, the steam pressure in the third drying cylinder 33 and the fourth drying cylinder 34 is 30 KPa-50 KPa, and the cylinder surface temperature is 70-80 ℃.
Specifically, after the wet paper web of the gray paper board sequentially passes through the first drying cylinder 31, the second drying cylinder 32, the third drying cylinder 33 and the fourth drying cylinder 34, the temperature of the wet paper web is raised from 40 ℃ to 70 ℃, so that the surface tension and viscosity of water in the wet paper web are reduced, the moisture content of the transverse web of the wet paper web is kept uniform, the dewatering capacity of a subsequent squeezing part and the drying capacity of a drying part are improved, the dewatering uniformity of the wet paper web during squeezing is improved, the moisture difference during drying is reduced, the workload of gloss squeezing and calendaring performed subsequently is reduced, paper diseases such as edge warping, wrinkling and the like are avoided when the wet paper web enters the drying cylinder, and the gray paper board with higher quality is facilitated.
Preferably, the upper roll of the pre-press roll 21 is a blind roll, and the lower roll is a vacuum roll or a rubber roll.
Preferably, the upper rolls in the front two front press rolls 22 are blind hole rolls, and the lower rolls are vacuum rolls or rubber rolls; the upper roll and the lower roll in the last front press roll 22 are blind hole rolls.
Preferably, the first rear press roll 41 is a blind press and the second rear press roll 42 is a stone press.
Preferably, a cooling device 9 is further arranged between the second calender 8 and the paper winding machine 10, the cooling device 9 comprises a plurality of air extractors, the air extractors are arranged above the dry paper web of the gray paper board side by side, and the heat emitted by the dry paper web of the gray paper board is extracted by rapid air extraction, so that the temperature of the dry paper web of the gray paper board is rapidly reduced to 40-50 ℃.
Example 1 to produce 350g/m 2 For example, a method for producing gray paperboard comprises the following steps:
(1) Pulping
The surface layer slurry raw materials are mixed according to the following mass fractions: 15% of old newspaper, 50% of book paper and 35% of paper sheets, and preparing surface pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the following raw materials in percentage by mass: 15% of old newspaper, 50% of book paper and 35% of paper sheets, and preparing bottom pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the core layer slurry raw materials according to the following mass fractions: 70% of paperboard and 30% of old cardboard paper, and after mixing, crushing, deslagging, desanding, screening, concentrating and pulping to prepare core pulp;
(2) Slurry preparation
The surface layer and bottom layer slurry are mixed according to the proportion of 1:1, mixing, adding reinforcing agent cationic polyacrylamide after mixing, wherein the dosage of the reinforcing agent is 20 kg/ton of slurry to prepare mixed slurry, sending half of the mixed slurry into a surface layer slurry forming tank for standby to prepare surface layer finished slurry, sending the other half of the mixed slurry into a bottom layer slurry forming tank for standby to prepare bottom layer finished slurry, and the beating degree of the surface layer finished slurry and the bottom layer finished slurry is 40 DEG SR-85 DEG SR;
mixing the core layer slurry according to the following mass fractions: 40% of core layer slurry, 5% of filler, 5% of recovered slurry and 50% of self-made or outsourced mechanical slurry, adding an enhancer cationic polyacrylamide after mixing, wherein the dosage of the enhancer is 20 kg/ton of slurry, and after preparation, sending the slurry into a core layer slurry forming tank for standby to prepare core layer finished product slurry, and the beating degree of the core layer finished product slurry is 20-55 DEG SR;
(3) Shaping
Dewatering and forming the surface layer finished pulp, the bottom layer finished pulp and the core layer finished pulp on a net part through respective headboxes, respectively carrying out papermaking on a gray paperboard surface layer wet paper web, a bottom layer wet paper web and a core layer wet paper web according to the surface layer quantitative 20 g/square meter, the bottom layer quantitative 20 g/square meter and the core layer quantitative 310 g/square meter, and sequentially compounding the surface layer wet paper web, the core layer wet paper web and the bottom layer wet paper web at the latter half end of the net part to form a gray paperboard wet paper web; the wet paper web of the gray paper board is extruded and dehydrated by a front pressing part, heated by a pre-heating device, extruded and dehydrated by a rear pressing part, dried by a front drying part, finished paper surface by a first calender, dried by a rear drying part, finished paper surface by a second calender, cooled by a cooling device and reeled by a paper winder, and the finished paper of the gray paper board is obtained.
Further, a raw starch suspension was sprayed between the top wet paper web and the core wet paper web and between the core wet paper web and the bottom wet paper web, the raw starch suspension being used in an amount of 4 kg/ton pulp.
Example 2: to produce 500g/m 2 For example, a method for producing gray paperboard comprises the following steps:
(1) Pulping
The surface layer slurry raw materials are mixed according to the following mass fractions: 20% of old newspaper, 50% of book paper and 30% of paper sheets, and preparing surface pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the following raw materials in percentage by mass: 20% of old newspaper, 50% of book paper and 30% of paper sheets, and preparing bottom pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the core layer slurry raw materials according to the following mass fractions: 60% of paperboard and 40% of old cardboard paper, and after mixing, crushing, deslagging, desanding, screening, concentrating and pulping to prepare core pulp;
(2) Slurry preparation
The surface layer and bottom layer slurry are mixed according to the proportion of 1:1, mixing, adding reinforcing agent cationic polyacrylamide after mixing, wherein the dosage of the reinforcing agent is 25 kg/ton pulp to prepare mixed pulp, sending half of the mixed pulp into a surface layer pulping tank for standby to prepare surface layer finished pulp, and sending the other half of the mixed pulp into a bottom layer pulping tank for standby to prepare bottom layer finished pulp, wherein the beating degree of the surface layer finished pulp and the bottom layer finished pulp is 40 DEG SR-85 DEG SR;
mixing the core layer slurry according to the following mass fractions: 40% of core layer slurry, 10% of filler, 5% of recovered slurry and 45% of self-made or outsourced mechanical slurry, adding an enhancer cationic polyacrylamide after mixing, wherein the dosage of the enhancer is 25 kg/ton of slurry, and after preparation, sending the slurry into a core layer slurry forming tank for standby to prepare core layer finished product slurry, and the beating degree of the core layer finished product slurry is 20-55 DEG SR;
(3) Shaping
Dewatering and forming the surface layer finished pulp, the bottom layer finished pulp and the core layer finished pulp on a net part through respective headboxes, respectively carrying out papermaking on a gray paperboard surface layer wet paper web, a bottom layer wet paper web and a core layer wet paper web according to the surface layer quantitative 25 g/square meter, the bottom layer quantitative 25 g/square meter and the core layer quantitative 450 g/square meter, and sequentially compounding the surface layer wet paper web, the core layer wet paper web and the bottom layer wet paper web at the latter half end of the net part to form a gray paperboard wet paper web; the wet paper web of the gray paper board is extruded and dehydrated by a front pressing part, heated by a pre-heating device, extruded and dehydrated by a rear pressing part, dried by a front drying part, finished paper surface by a first calender, dried by a rear drying part, finished paper surface by a second calender, cooled by a cooling device and reeled by a paper winder, and the finished paper of the gray paper board is obtained.
Further, a raw starch suspension was sprayed between the top wet paper web and the core wet paper web and between the core wet paper web and the bottom wet paper web, and the raw starch suspension was used in an amount of 6 kg/ton pulp.
Example 3: to produce 650g/m 2 For example, a method for producing gray paperboard comprises the following steps:
(1) Pulping:
the surface layer slurry raw materials are mixed according to the following mass fractions: 20% of old newspaper, 40% of book paper and 40% of paper sheets, and preparing surface pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the following raw materials in percentage by mass: 20% of old newspaper, 40% of book paper and 40% of paper sheets, and preparing bottom pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the core layer slurry raw materials according to the following mass fractions: 50% of paperboard and 50% of old cardboard paper, and after mixing, crushing, deslagging, desanding, screening, concentrating and pulping to prepare core pulp;
(2) Preparing slurry:
the surface layer and bottom layer slurry are mixed according to the proportion of 1:1, mixing, adding reinforcing agent cationic polyacrylamide after mixing, wherein the dosage of the reinforcing agent is 25 kg/ton pulp to prepare mixed pulp, sending half of the mixed pulp into a surface layer pulping tank for standby to prepare surface layer finished pulp, and sending the other half of the mixed pulp into a bottom layer pulping tank for standby to prepare bottom layer finished pulp, wherein the beating degree of the surface layer finished pulp and the bottom layer finished pulp is 40 DEG SR-85 DEG SR;
mixing the core layer slurry according to the following mass fractions: 40% of core layer slurry, 15% of filler, 5% of recovered slurry and 40% of self-made or outsourced mechanical slurry, adding an enhancer cationic polyacrylamide after mixing, wherein the dosage of the enhancer is 25 kg/ton of slurry, and after preparation, sending the slurry into a core layer slurry forming tank for standby to prepare core layer finished product slurry, and the beating degree of the core layer finished product slurry is 20-55 DEG SR;
(3) Shaping
Dewatering and forming the surface layer finished pulp, the bottom layer finished pulp and the core layer finished pulp on a net part through respective headboxes, respectively carrying out papermaking on a gray paperboard surface layer wet paper web, a bottom layer wet paper web and a core layer wet paper web according to the surface layer quantitative 25 g/square meter, the bottom layer quantitative 25 g/square meter and the core layer quantitative 450 g/square meter, and sequentially compounding the surface layer wet paper web, the core layer wet paper web and the bottom layer wet paper web at the latter half end of the net part to form a gray paperboard wet paper web; the wet paper web of the gray paper board is extruded and dehydrated by a front pressing part, heated by a pre-heating device, extruded and dehydrated by a rear pressing part, dried by a front drying part, finished paper surface by a first calender, dried by a rear drying part, finished paper surface by a second calender, cooled by a cooling device and reeled by a paper winder, and the finished paper of the gray paper board is obtained.
Further, a raw starch suspension was sprayed between the top wet paper web and the core wet paper web and between the core wet paper web and the bottom wet paper web, and the raw starch suspension was used in an amount of 6 kg/ton pulp.
The gray paperboard produced in examples 1-3 above was tested and the results are shown in table 1.
Table 1: examples 1-3 results of the Gray cardboard Performance test
Example 1 Example 2 Example 3
Quantification of(g/m 2 ) 350 500 650
Thickness (μm) 600 855 1110
Moisture (%) 7.5 7.5 7.5
Appearance quality Good quality Good quality Good quality
As shown in Table 1, the gray paperboard produced by the invention has good appearance quality, is not easy to warp and deform, and has high quality.
The invention has been further described with reference to specific embodiments, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the invention, but rather as providing those skilled in the art with the benefit of this disclosure with the benefit of their various modifications to the described embodiments.

Claims (10)

1. The ash paper board production equipment is characterized by comprising a net part (1), a front pressing part (2), a pre-heating device (3), a rear pressing part (4), a front drying part (5), a first calender (6), a rear drying part (7), a second calender (8) and a paper winding machine (10) which are sequentially arranged, wherein the net part (1) comprises a core layer net (11), a surface layer net (13) and a bottom layer net (14), the core layer net (11) and the surface layer net (13) are arranged above the bottom layer net (14), and a top net (12) is arranged above the core layer net (11); the front press part (2) comprises two pre-press rolls (21) and three front press rolls (22) which are sequentially arranged; the pre-heating device (3) comprises a first drying cylinder (31), a second drying cylinder (32), a third drying cylinder (33) and a fourth drying cylinder (34) which are sequentially arranged; the rear press section (4) comprises a first rear press roll (41) and a second rear press roll (42); the front drying part (5) comprises five groups of dryer cylinders arranged in a double-hanging net manner; the post-drying section (7) comprises a set of twin wire cylinders.
2. A gray paperboard production facility according to claim 1, wherein: steam is introduced into the first drying cylinder (31), the second drying cylinder (32), the third drying cylinder (33) and the fourth drying cylinder (34), the steam pressure in the first drying cylinder (31) and the second drying cylinder (32) is 10 KPa-30 KPa, the cylinder surface temperature is 50-60 ℃, the steam pressure in the third drying cylinder (33) and the fourth drying cylinder (34) is 30 KPa-50 KPa, and the cylinder surface temperature is 70-80 ℃.
3. A gray paperboard production facility according to claim 1, wherein: the upper roller in the pre-pressing roller (21) is a blind hole roller, and the lower roller is a vacuum roller or a rubber roller.
4. A gray paperboard production facility according to claim 1, wherein: the upper rollers in the front two front press rollers (22) are blind hole rollers, and the lower rollers are vacuum rollers or rubber rollers; the last upper roll and the last lower roll in the front press roll (22) are blind hole rolls.
5. A gray paperboard production facility according to claim 1, wherein: the first rear press roll (41) is a blind hole press, and the second rear press roll (42) is a stone roll press.
6. A gray paperboard production facility according to claim 1, wherein: and a cooling device (9) is further arranged between the second calender (8) and the paper winding machine (10), and the cooling device (9) comprises a plurality of air extractors which are arranged above the dry paper web of the gray paperboard side by side.
7. A method for producing gray paperboard in a gray paperboard production facility according to any of claims 1-6, characterized by the steps of:
(1) Pulping
The surface layer slurry raw materials are mixed according to the following mass fractions: 10-20% of old newspaper, 20-50% of book paper and 30-70% of paper cover, and preparing surface pulp through crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the following raw materials in percentage by mass: 10-20% of old newspaper, 20-50% of book paper and 30-70% of paper cover, and the bottom pulp is prepared by crushing, deslagging, desanding, screening, concentrating and pulping;
mixing the core layer slurry raw materials according to the following mass fractions: 50-70% of paperboard and 30-50% of old cardboard paper, and after mixing, crushing, deslagging, desanding, screening, concentrating and pulping to prepare core pulp;
(2) Slurry preparation
The surface layer and bottom layer slurry are mixed according to the proportion of 1:1, mixing, adding an enhancer to prepare mixed slurry, sending half of the mixed slurry into a surface layer slurry forming pond for standby to prepare surface layer finished slurry, and sending the other half of the mixed slurry into a bottom layer slurry forming pond for standby to prepare bottom layer finished slurry, wherein the beating degree of the surface layer finished slurry and the bottom layer finished slurry is 40-85 DEG SR;
mixing the core layer slurry according to the following mass fractions: 40-70% of core layer slurry, 5-15% of filler and 15-55% of recovered slurry and/or mechanical slurry, adding a reinforcing agent after mixing, and sending the mixture into a core layer slurry forming tank for standby after preparation to prepare core layer finished product slurry, wherein the beating degree of the core layer finished product slurry is 20-55 DEG SR;
(3) Shaping
And (3) dewatering and forming the surface layer finished pulp, the bottom layer finished pulp and the core layer finished pulp on a wire part through respective headboxes, respectively manufacturing a gray paperboard surface layer wet paper web, a bottom layer wet paper web and a core layer wet paper web, and then compositing the gray paperboard surface layer wet paper web, the bottom layer wet paper web and the core layer wet paper web through the wire part, extruding and dewatering through a front pressing part, heating through a pre-heating device, extruding and dewatering through a rear pressing part, drying through a front drying part, finishing paper surfaces through a first calender, drying through a rear drying part, finishing paper surfaces through a second calender, cooling through a cooling device and reeling through a paper reeling machine, thus obtaining gray paperboard finished paper.
8. The method of producing gray paperboard according to claim 7, wherein: in the step 2, the reinforcing agent is cationic polyacrylamide, and the dosage is 20-25 kg/ton of slurry; the filler is kaolin.
9. The method of producing gray paperboard according to claim 7, wherein: in the step 3, the paper making of the gray paperboard surface layer wet paper web, the bottom layer wet paper web and the core layer wet paper web is respectively carried out according to the surface layer ration of 20 g/square meter-80 g/square meter, the bottom layer ration of 20 g/square meter-80 g/square meter and the core layer ration of 210 g/square meter-840 g/square meter.
10. The method of producing gray paperboard according to claim 7, wherein: before the gray paperboard surface layer wet paper web, the bottom layer wet paper web and the core layer wet paper web are compounded, raw starch suspension liquid is sprayed between the surface layer wet paper web and the core layer wet paper web and between the core layer wet paper web and the bottom layer wet paper web, and the dosage of the raw starch suspension liquid is 4-6 kg/ton pulp.
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CN1703552A (en) * 2001-06-18 2005-11-30 麦特索纸业公司 Method, paper machine and base paper for the manufacture of LWC printing paper coated once
FI20065577A0 (en) * 2006-09-21 2006-09-21 Metso Paper Inc Paper or cardboard machine
CN101338531A (en) * 2008-08-07 2009-01-07 浙江永泰纸业集团股份有限公司 Method for producing coated kraft card board by home-made paper machine
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