CN109082945B - Preparation process of coated grey-bottom white board paper - Google Patents
Preparation process of coated grey-bottom white board paper Download PDFInfo
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- CN109082945B CN109082945B CN201810723149.0A CN201810723149A CN109082945B CN 109082945 B CN109082945 B CN 109082945B CN 201810723149 A CN201810723149 A CN 201810723149A CN 109082945 B CN109082945 B CN 109082945B
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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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
A process for preparing coated white board with ash bottom includes such steps as classifying and optimizing the waste paper by five pulp lines (MOW, DIP, MWP, OCC and ONP), classifying, screening, purifying, floating, concentrating and thermal dispersing to obtain qualified pulp, stacking, forming by net, pressing, applying adhesive, drying, coating, press polishing and winding. According to the preparation process of the coated grey white board, the waste paper is recycled, so that the produced grey white board has good quality, the manufacturing cost of enterprises is effectively reduced, the resources are saved, and the damage of the waste paper to the environment is reduced.
Description
Technical Field
The invention relates to a papermaking process, in particular to a preparation process of coated grey-bottom white board paper.
Background
The coated grey white board is a middle-grade packaging paper, which is an important component of the packaging paper. In recent years, energy conservation and environmental protection are the development directions of enterprises, and the problem that the enterprises need to pay attention to the long-term sustainable development is also provided. In order to respond to the national call for energy conservation and emission reduction, the ecological environment is protected, and sustainable development is realized. In the papermaking process, waste paper pulp is used as a product raw material as much as possible, so that the enterprise cost can be obviously reduced, and the damage of waste paper to the environment can be reduced. However, the conventional process of making paper from waste paper still has many drawbacks, which results in unstable quality of the grey white board produced by the conventional process.
Disclosure of Invention
Based on this, it is necessary to provide a preparation process of coated grey white board to solve the problem of unstable quality of white board prepared from traditional waste paper, aiming at the defects in the prior art.
The technical scheme of the invention is as follows:
a preparation process of coated grey white board paper is used for preparing waste paper into the grey white board paper, and the grey white board paper comprises a surface layer, a lining layer, a core layer and a bottom layer which are sequentially arranged; the preparation process of the coated grey white board comprises the following steps:
step one, preparing slurry in an early stage; classifying and optimizing different types of waste paper by adopting five pulp threads; the five slurry lines are respectively a MOW slurry line, a DIP slurry line, an ONP slurry line, an MWP slurry line and an OCC slurry line;
(1) the MWP pulp line comprises a bale breaker, a pulper, a high-concentration sand remover, a coarse screening system, a fiber grading screen, a short fiber treatment system, a long fiber treatment system and an MWP pulp tower which are sequentially designed; the short fiber treatment system comprises a low-concentration desander, a multi-disc thickener and a short fiber transition slurry tank which are sequentially arranged, and the long fiber treatment system comprises a heavy desander, a fine screening system, a light desander, a multi-disc thickener and a long fiber transition slurry tank which are sequentially arranged;
the preparation method of the slurry of the MWP slurry line comprises the following steps:
A. providing MWP pulp line mixed waste paper, and sequentially performing scattering primary selection, pulping into pulp by a pulper, deslagging by a high-concentration deslagging system, coarse screening and fiber grading screening on the MWP mixed waste paper to screen out short fibers and long fibers; the short fibers are sequentially subjected to deslagging by a low-concentration desander and concentration by a multi-disc concentrator, and then are stored in an MWP pulp tower through a transition pulp tank; the long fiber is sequentially subjected to deslagging by a heavy sand remover, fine screening by a fine screening system, deslagging by a light sand remover and concentrating by a multi-disc concentrator; then storing the slurry in an MWP slurry tower through a slurry-spreading tank;
(2) the DIP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a medium-concentration desander, a fine screening system, a No. 1 flotation tank, a low-concentration desander, a light desander, a No. 1 multi-disc thickener, a heat disperser, a bleaching tower, a No. 2 flotation tank, a No. 2 multi-disc thickener, a transition pulp tank and a DIP pulp tower which are designed in sequence;
the preparation method of the slurry of the DIP slurry line comprises the following steps:
A. providing DIP pulp line mixed waste paper, sequentially carrying out primary scattering on the DIP mixed waste paper by a bale breaker, pulping the DIP mixed waste paper into pulp by a pulper, removing high-concentration slag, screening by a coarse screen, removing slag by a medium-concentration slag remover, screening by a fine screen and floating by a 1# flotation tank, and conveying the slag pulp after flotation to an MWP line for recycling; concentrating the fine pulp subjected to flotation by a multi-disc thickener, spirally extruding to the concentration of 20% -40%, thermally dispersing by a thermal dispersion machine, bleaching by a bleaching tower, performing flotation by a 2# flotation tank and concentrating by the 2# multi-disc thickener in sequence, reducing and bleaching the concentrated pulp, and storing the pulp in a DIP pulp tower by a transition pulp tank;
(3) the MOW pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a discharging pulp tower, a medium-concentration screening system, a No. 1 flotation tank, a low-concentration desander, a fine screening system, a No. 1 multi-disc thickener, a No. 1 heat disperser, a middle pool, a No. 2 flotation tank, a No. 2 multi-disc thickener, a No. 2 heat disperser, a bleaching tower, a No. 3 flotation tank, a No. 3 multi-disc thickener and an MOW pulp tower which are designed in sequence;
the preparation method of the slurry of the MOW slurry wire comprises the following steps:
A. providing MOW pulp line mixed waste paper, wherein the MOW line mixed waste paper is subjected to primary scattering by a bale breaker, pulping by a pulper to form pulp, deslagging by a high-concentration deslagging system, screening impurities by a coarse screen, screening by a medium-concentration screen and flotation treatment by a No. 1 flotation tank in sequence, the floated pulp is sent to an MWP pulp line for recycling, fine pulp after flotation is subjected to deslagging by a low-concentration sand remover, screening by a fine screen, concentrating by a No. 1 multi-disc concentrator, spirally extruding to 20% -40% concentration and thermally dispersing by a No. 1 thermal disperser in sequence, and the slurry after thermal dispersion treatment enters an intermediate tank; part of the good pulp in the middle tank is sent to a DIP pulp tower; treating the other part of good pulp in the middle tank by a No. 2 flotation tank, concentrating by a No. 2 multi-disc concentrator, thermally dispersing by No. 2 thermal dispersion, carrying out high-concentration oxidation bleaching by a bleaching tower, concentrating by a No. 3 flotation tank and a No. 3 multi-disc concentrator, reducing and bleaching the concentrated pulp, and storing the pulp in a MOW pulp tower;
(4) the ONP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a medium-concentration screening system, a flotation tank, a low-concentration desander, a fine screening system, a multi-disc thickener, a heat dispersion machine, a transition pulp tank and an ONP pulp tower which are designed in sequence;
the preparation method of the slurry of the ONP slurry line comprises the following steps:
A. providing ONP pulp wire mixed waste paper, sequentially carrying out primary sorting on the ONP pulp wire mixed waste paper by a bale breaker, pulping into pulp by a pulper, deslagging by a high-concentration deslagging system, screening impurities by a coarse screen, screening by a three-section medium-concentration screen, then feeding the pulp into a flotation tank, sending the slag pulp subjected to flotation treatment to an MWP line for recycling, sequentially carrying out deslagging by a three-section low-concentration sand remover, screening by a three-section fine screen, concentrating by a multi-disc concentrator, carrying out spiral extrusion to reach the concentration of 20-40% and carrying out thermal dispersion treatment by a thermal dispersion machine, and then storing the pulp into an ONP pulp tower through a pulp-transition tank;
(5) the OCC pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a fiber grading screen, a short fiber treatment system, a long fiber treatment system, an OCC transition pool and an OCC pulp tower which are sequentially designed; the long fiber treatment system comprises a heavy sand remover, a fine screening system, a multi-disc thickener and a heat dispersion machine; wherein the short fiber treatment system comprises a heavy sand remover, a light sand remover, a multi-disc concentrator and a heat dispersion machine;
the preparation method of the slurry of the OCC slurry line comprises the following steps:
A. providing OCC pulp line mixed waste paper, and sequentially carrying out sorting by a bale breaker, pulping by a pulper, degritting by a high-concentration degritting system, screening by a coarse screen and screening by a classifying screen to screen short fibers and long fibers; the short fibers are sequentially subjected to deslagging by a heavy sand remover and a light sand remover, concentration by a light sand remover and a multi-disc concentrator, spiral extrusion to a concentration of 20-30%, dispersion by a heat dispersion machine, and then stored in an OCC slurry tower by an OCC transition slurry pool; the long fibers are sequentially subjected to low-concentration removal, heavy sand removal, fine screening and fine screening, concentration by a multi-disc concentrator, spiral extrusion to the concentration of 20-40% and thermal dispersion by a thermal dispersion machine, and then are stored in an OCC slurry tower through an OCC transition slurry pool;
step two, later-stage pulp papermaking; adopting a papermaking system to conduct papermaking on the pulp prepared in the step one; the papermaking system comprises a surface layer flow conveying system, a lining layer flow conveying system, a bottom layer flow conveying system and a core layer flow conveying system; slurry in the MOW slurry tower flows to a surface layer approach system to be processed to form the surface layer, slurry in the DIP slurry tower flows to a lining layer approach system to form the lining layer, slurry in the ONP slurry tower flows to a bottom layer approach system to be processed to form the bottom layer, and slurry in the MWP slurry tower and part of OCC slurry tower flows to a core layer approach system to be processed to form the core layer; the surface layer, the lining layer, the core layer and the bottom layer are formed and then compounded into the paperboard.
Further, the MOW pulp line mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, and the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0% -20%): (70% -90%).
Further, the DIP pulp mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, and the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0% -20%): (70% -90%).
Further, the ONP pulp line mixed waste paper comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, and the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (80% -100%) (0% -10%): (0% -10%).
Further, the MWP pulp line mixed waste paper comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, and the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (0% -20%): (70% -90%).
Further, the OCC pulp line mixed waste paper comprises American waste paper and Chinese waste paper, and the proportion of the American waste paper to the Chinese waste paper is (20% -40%) to (60% -80%).
Further, in the second step, the core layer approach system comprises a core layer head box and a core net, and a sandwich net is arranged on the core net.
Further, in the second step, the compounded paper board is sequentially subjected to press dehydration, pre-drying dehydration, surface sizing, post-drying dehydration, hard calendaring, coating, hot air drying and soft calendaring, and then enters a winder to be rolled into paper.
Further, the compounded paper board is dewatered by three pressing processes, namely groove blind hole pressing, shoe pressing and gloss pressing.
Further, in the slurry preparation methods of the DIP slurry line, the MOW slurry line and the ONP slurry line, the slag slurry floated by the 1# flotation tank can be sent to the MWP slurry line for recycling.
In summary, the preparation process of the coated grey white board paper of the invention carries out classification optimization treatment on different types of waste paper through five pulp lines (MOW, DIP, MWP, OCC and ONP), the waste paper is firstly crushed into paper pulp, the paper pulp is subjected to the working procedures of classification screening, purification, flotation, concentration, thermal dispersion and the like to produce qualified pulp, the qualified pulp is sent to a paper machine with multiple nets, and the qualified grey white board paper is produced through the working procedures of net part forming and compounding, pressing, sizing, drying, coating, calendaring, reeling and the like. According to the preparation process of the coated grey white board, the waste paper is recycled, so that the produced grey white board has good quality, the manufacturing cost of enterprises is effectively reduced, the resources are saved, and the damage of the waste paper to the environment is reduced.
Drawings
FIG. 1 is a flow chart of a process for coating gray-based white board paper according to the present invention;
FIG. 2 is a flow diagram of a slurry preparation process for the MWP slurry line of FIG. 1;
FIG. 3 is a flow diagram of a slurry preparation process for the DIP slurry line of FIG. 1;
FIG. 4 is a flow chart of a slurry preparation process for the MOW slurry line of FIG. 1;
FIG. 5 is a flow chart of a slurry preparation process for the ONP slurry line of FIG. 1;
FIG. 6 is a flow diagram of a slurry preparation process for the OCC slurry line of FIG. 1;
fig. 7 is a sheet process flow diagram of each of the pulps prepared in fig. 2 to 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to 7, the present invention provides a process for producing coated grey white board, which is used to produce waste paper into grey white board. The grey white board comprises a surface layer, a lining layer, a core layer and a bottom layer which are arranged in sequence. The preparation process of the coated grey white board comprises an early slurry preparation stage and a later slurry papermaking stage, wherein five slurry lines are adopted for treating different types of waste paper in the slurry preparation; the five slurry lines are respectively a MOW slurry line, a DIP slurry line, an ONP slurry line, an MWP slurry line and an OCC slurry line; the preparation method of the sizing agent of each sizing agent line comprises the following specific steps:
(1) the MWP pulp line comprises a bale breaker, a pulper, two sections of high-concentration desanders, two sections of coarse screening systems, a discharging pulp tower, a fiber grading screen, a short fiber treatment system, a long fiber treatment system and an MWP pulp tower which are designed in sequence; the short fiber treatment system comprises three sections of low-concentration desanders, a multi-disc concentrator and a short fiber transition slurry tank which are sequentially arranged, and the long fiber treatment system comprises four sections of heavy desanders, a three-section fine screening system, a two-section light desander, a multi-disc concentrator and a long fiber transition slurry tank which are sequentially arranged;
the preparation method of the slurry of the MWP slurry line comprises the following steps:
A. the MWP pulp line mixed waste paper comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, wherein the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (0% -20%): (70% -90%). Preferably, the ratio of U.S. waste paper, Chinese hong Kong waste paper and Chinese waste paper is 10% to 80%.
The mixed waste paper of the MWP line is primarily sorted by a bale breaker, and is conveyed to a drum pulper by a chain plate conveyor to be pulped into paper pulp, and meanwhile, the garbage is separated out and is conveyed to a washing line by a belt conveyor to be classified; good pulp enters an unloading pulp tower through two sections of high-concentration deslagging systems, then is screened out to obtain residue pulp and impurities containing heavy impurities through two sections of coarse screens, the residue pulp enters a flotation slag cleaning machine, a high-level box and an impurity separator for treatment, the impurities are discharged to a residue pulp room and are pulled away by a vehicle, and the pulp after the residue pulp is discharged enters a fiber grading screen; screening short fibers and long fibers from the sizing agent subjected to the fiber grading sieve;
B. the short fibers are subjected to deslagging through a three-section desander, good pulp passing through the short fiber three-section desander enters a multi-disc thickener for concentration, the concentrated pulp is sent to a short fiber transition pulp tank and stored in an MWP pulp tower, and finally, paper is removed from a pool after core layer beating to make paper;
C. and the long fiber is subjected to deslagging by a four-section heavy sand remover, good pulp of the long fiber is subjected to fine screening by a four-section sand remover, the good pulp of the long fiber is subjected to fine screening by a three-section fine screening system, the good pulp of the long fiber is subjected to deslagging by a two-section light sand remover, the good pulp of the two-section light sand remover is subjected to concentration by a multi-disc concentrator, the concentrated pulp is sent to a long fiber transition pulp tank and is stored in an MWP pulp tower, and finally, the concentrated pulp is subjected to paper making by a paper machine in a tank after core layer beating.
(2) The DIP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a two-section coarse screening system, a two-section medium-concentration desander, a two-section fine screening system, a No. 1 flotation tank, a three-section low-concentration desander, a three-section light desander, a No. 1 multi-disc thickener, a heat dispersion machine, a bleaching tower, a No. 2 flotation tank, a No. 2 multi-disc thickener, a transition pulp tank and a DIP pulp tower which are designed in sequence;
the preparation method of the slurry of the DIP slurry line comprises the following steps:
A. providing DIP pulp line mixed waste paper, wherein the DIP pulp line mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, and the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0% -20%): 70% -90%); preferably, the ratio of the U.S. waste paper, Japanese waste paper and Chinese waste paper is 10%: 10%: 80%.
The mixed waste paper of the DIP pulp line is primarily sorted by a bale breaker, is conveyed to a drum pulper by a chain plate conveyor to be pulped into paper pulp, and meanwhile, the garbage is separated out and is conveyed to a washing line by a belt conveyor to be classified; good pulp is subjected to deslagging by a high-concentration deslagging system, then is subjected to two-section coarse screening for impurities, the impurities are sent to a washing water line for classification treatment by a belt conveyor, the screened good pulp enters a two-section medium-concentration deslagging device for deslagging, then is subjected to two-section fine screening for screening, the good pulp screened by the two-section fine screening enters a No. 1 flotation tank, the residue pulp subjected to flotation treatment is sent to an MWP line for recycling, the good pulp subjected to flotation treatment is sent to a three-section low-concentration desander for removing heavy residue, then is subjected to three-section light desander for removing light residue, the purified good pulp is sent to a No. 1 multi-disc thickener for concentration, then is spirally extruded to a concentration of 30%, and is spirally conveyed to a thermal disperser for thermal dispersion so as to disperse adhesive substances in the pulp, the pulp subjected to thermal dispersion treatment enters a bleaching tower, the pulp subjected to high-concentration oxidative bleaching, the pulp subjected to oxidative bleaching enters a flotation No. 2 multi-disc thickener for concentration, and (3) carrying out reduction bleaching on the concentrated pulp, enabling the pulp subjected to reduction bleaching to enter a transition pulp tank, storing the pulp in a DIP pulp tower, and finally beating through a lining layer and removing the pulp from a tank to a paper machine for papermaking.
(3) The MOW pulp line comprises a bale breaker, a pulper, a high-concentration desander, a two-section coarse screening system, a discharging pulp tower, a three-section medium-concentration screening system, a 1# flotation tank, a four-section low-concentration desander, a two-section fine screening system, a 1# multi-disc thickener, a 1# heat disperser, a middle pool, a 2# flotation tank, a 2# multi-disc thickener, a 2# heat disperser, a bleaching tower, a 3# flotation tank, a 3# multi-disc thickener and an MOW pulp tower which are designed in sequence.
The preparation method of the slurry of the MOW slurry wire comprises the following steps:
A. providing MOW pulp line mixed waste paper, wherein the MOW pulp line mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, and the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0-20%): (70-90%); preferably, the ratio of the U.S. waste paper, Japanese waste paper and Chinese waste paper is 10%: 10%: 80%.
The mixed waste paper of the MOW pulp line is primarily sorted by a bale breaker, is conveyed to a drum pulper by a chain plate conveyor to be pulped into paper pulp, and meanwhile, the garbage is separated out and is conveyed to a washing line by a belt conveyor to be classified; good pulp is subjected to deslagging by a high-concentration deslagging system, impurities are screened out by a two-section coarse screen, the impurities are sent to a washing water line for classification treatment by a belt conveyor, the pulp from which the impurities are discharged enters an unloading pulp tower, then is screened by a three-section medium-concentration screen, the screened good pulp enters a No. 1 flotation tank, the residue pulp after flotation treatment is sent to an MWP line for recycling, the good pulp after flotation treatment is sent to a four-section low-concentration desander for deslagging, then is screened by a two-section fine screen, and the good pulp screened by the two-section fine screen enters a fine screen multi-disc thickener for concentration; then the slurry is extruded to the concentration of 30% by a screw, the slurry is conveyed to a heat dispersion machine by the screw to be thermally dispersed so as to disperse adhesive substances in the slurry, and the slurry after the 1# thermal dispersion treatment enters an intermediate tank;
B. the fine pulp in the middle tank is partially sent to a DIP pulp tower, and finally, the fine pulp is tapped by a lining layer and then is sent to a paper machine for papermaking (compared with a DIP line, the cost is saved);
C. and the good pulp in the middle tank and the other part of the good pulp are sent to a 2# flotation tank for treatment, the good pulp after flotation treatment enters a 2# multi-disc thickener for concentration, the concentrated pulp is sent to a 2# thermal dispersion concentrator for re-dispersing adhesive substances in the pulp, the pulp after 2# thermal dispersion treatment enters a bleaching tower, the pulp is subjected to high-concentration oxidation bleaching, the pulp after oxidation bleaching enters a 3# flotation tank, the good pulp after flotation treatment enters a 3# multi-disc thickener for concentration, the concentrated pulp is subjected to reduction bleaching, the pulp after reduction bleaching treatment is stored in an MOW pulp tower, and finally, paper is removed from a pool after surface layer beating for papermaking.
(4) The ONP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a two-section coarse screening system, a three-section medium-concentration screening system, a flotation tank, a three-section low-concentration desander, a three-section fine screening system, a multi-disc thickener, a heat disperser, a transition pulp tank and an ONP pulp tower which are designed in sequence;
the preparation method of the slurry of the ONP slurry line comprises the following steps:
A. providing mixed waste materials of ONP pulp line, wherein the mixed waste paper of ONP pulp line comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, and the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (80% -100%) (0% -10%): (0% -10%). Preferably, the American waste paper, Chinese hong Kong waste paper and Chinese waste paper are 90%: 5%: 5%.
The mixed waste paper of the ONP line is primarily sorted by a bale breaker, is conveyed to a drum pulper by a chain plate conveyor to be pulped into paper pulp, and meanwhile, the garbage is separated out and is conveyed to a washing line by a belt conveyor to be classified; good pulp is subjected to deslagging by a high-concentration deslagging system, then impurities are screened by a two-section coarse screen, the impurities are sent to a washing water line for classification treatment by a belt conveyor, the screened good pulp enters a three-section medium-concentration screen for screening, the good pulp screened by the medium-concentration screen enters a flotation tank, the residue pulp subjected to flotation treatment is sent to an MWP line for recycling, the good pulp subjected to flotation treatment is sent to a three-section low-concentration desander for deslagging, then is screened by a three-section fine screen, the screened and purified good pulp is sent to a multi-disc thickener for concentration, then is spirally extruded to the concentration of 30 percent, is spirally conveyed to a thermal dispersion machine for thermal dispersion so as to disperse adhesive substances in the pulp, the treated pulp enters a transition pulp tank and is stored in an ONP pulp tower, and finally is tapped from a bottom layer tank to be sent to a paper machine for papermaking.
(5) The OCC pulp line comprises a bale breaker, a pulper, a high-concentration desander, a two-section coarse screening system, a discharging pulp tower, a medium-concentration desander, a fiber grading screen, a short fiber treatment system, a long fiber treatment system, an OCC transition pool and an OCC pulp tower which are sequentially designed; the long fiber treatment system comprises a four-section heavy sand remover, a three-section fine screening system, a multi-disc thickener and a heat dispersion machine; the short fiber treatment system comprises two sections of low-concentration desanders, two sections of light desanders, a multi-disc thickener and a heat dispersion machine.
The preparation method of the slurry of the OCC slurry line comprises the following steps:
A. providing mixed waste paper of OCC pulp line, wherein the mixed waste paper of OCC pulp line comprises American waste paper and Chinese waste paper, and the proportion of the American waste paper to the Chinese waste paper is (20% -40%) to (60% -80%). Preferably, the ratio of U.S. waste paper to Chinese waste paper is 30% to 70%.
The OCC pulp line mixed waste paper is primarily sorted by a bale breaker, sent to a pulper by a chain plate conveyor to be pulped into paper pulp, meanwhile, the garbage is pulled out by a twisted rope, and the garbage and the slag pulp containing heavy impurities are pulled away by a vehicle; good pulp enters an unloading pulp tower through two sections of high-concentration desanding systems, then is screened out to obtain slag pulp and impurities containing heavy impurities through two sections of coarse screens, the slag pulp enters a flotation slag cleaning machine, a high-level box and an impurity separator for treatment, the impurities are discharged to a slag pulp room and are pulled away by a vehicle, and the pulp after the slag pulp is discharged enters a primary grading screen after being desanded by a medium-concentration desander; screening short fibers and long fibers from the slurry subjected to the primary grading sieve;
B. after the short fibers are subjected to deslagging through a four-section heavy desander and a two-section light desander, fine pulp passing through the short fiber two-section light desander enters a multi-disc thickener for concentration, then the fine pulp is spirally extruded to the concentration of 30 percent, the fine pulp is spirally conveyed to a heat dispersion machine for heat dispersion so as to disperse sticky substances, printing ink, resin, wax and other sticky substances in the pulp, the sticky substances are stored in an OCC pulp tower through an OCC transition pulp pool, and finally the fine pulp is subjected to paper making through a pool paper removing machine after core layer tapping;
C. and after the long fibers are subjected to deslagging through a four-section low-concentration desander, fine pulp passing through a four-section heavy desander enters a three-section fine screening system for fine screening, sludge is discharged into a trench, the fine pulp passing through the three-section fine screening enters a multi-disc concentrator for concentration, then the fine pulp is spirally extruded to the concentration of 30%, the fine pulp is spirally conveyed to a thermal dispersion machine for thermal dispersion so as to disperse sticky substances, such as sticky substances, printing ink, resin, wax and the like in the pulp, the sticky substances pass through an OCC (organic chemical vapor) transition pulp tank and are stored in an OCC pulp tower, and finally the fine pulp passes through a core layer knocking post-tank paper removing machine for papermaking.
Sending the qualified pulp prepared in the previous pulp preparation procedure to a paper machine workshop for papermaking; the paper machine workshop is provided with a paper making system, and the paper making system comprises a surface layer approach system, a lining layer approach system, a bottom layer approach system and a core layer approach system.
A. And the MOW slurry is sprayed to the surface net for forming through the surface layer flow box. The lining approach system comprises a lining headbox and a lining net, wherein a loop pulp and a DIP pulp of the MOW pulp line enter the lining approach system of the paper machine and are sprayed to the lining net for forming through the lining headbox. The core layer approach system comprises a core layer head box, a core net and a small sandwich net, wherein the core layer head box uses a dilution water head box, MWP pulp and OCC pulp enter the core layer approach system of the paper machine and are sprayed to the core net for forming through the core layer head box, and the small sandwich net arranged on the core layer promotes the dehydration and forming of the pulp. The bottom layer approach system comprises a bottom layer flow box and a bottom net, and ONP pulp enters the bottom layer approach system of the paper machine and is sprayed to the bottom net through the bottom layer flow box for forming; the surface layer, the lining layer, the core layer and the bottom layer are compounded into the paper board in the net part after being molded.
B. The paper board after the net part is compounded is dehydrated through three squeezing (groove blind hole squeezing, boot type squeezing and gloss squeezing), then is sent into a front drying part for drying and dehydration, the paper board which is dried before being discharged is sent into a film transfer sizing machine for surface sizing, and is dried and dehydrated through a rear drying part, the paper board which is discharged from the drying part enters a hard calender to improve the surface performance, then enters a coating working section (pre-, middle-, top-coating and back-coating sizing), the good printability is obtained through the scraper type coating machine, the paper board which is dried by hot air in the discharge coating section enters a soft calender to improve the surface performance, and then enters a winder to be rolled into paper.
In summary, the preparation process of the coated grey white board paper of the invention carries out classification optimization treatment on different types of waste paper through five pulp lines (MOW, DIP, MWP, OCC and ONP), the waste paper is firstly crushed into paper pulp, the paper pulp is subjected to the working procedures of classification screening, purification, flotation, concentration, thermal dispersion and the like to produce qualified pulp, the qualified pulp is sent to a paper machine with multiple nets, and the qualified grey white board paper is produced through the working procedures of net part forming and compounding, pressing, sizing, drying, coating, calendaring, reeling and the like. According to the preparation process of the coated grey white board, the waste paper is recycled, so that the produced grey white board has good quality, the manufacturing cost of enterprises is effectively reduced, the resources are saved, and the damage of the waste paper to the environment is reduced.
The above-mentioned embodiments only express one embodiment of the invention, and the description thereof is more specific and detailed, but not construed as limiting 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 inventive concept, which falls within the scope of the invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.
Claims (10)
1. A preparation process of coated grey white board paper is used for preparing waste paper into the grey white board paper, and the grey white board paper comprises a surface layer, a lining layer, a core layer and a bottom layer which are sequentially arranged; the method is characterized in that: the preparation process of the coated grey white board comprises the following steps:
step one, preparing slurry in an early stage; classifying and optimizing different types of waste paper by adopting five pulp threads; the five slurry lines are respectively a MOW slurry line, a DIP slurry line, an ONP slurry line, an MWP slurry line and an OCC slurry line;
(1) the MWP pulp line comprises a bale breaker, a pulper, a high-concentration sand remover, a coarse screening system, a fiber grading screen, a short fiber treatment system, a long fiber treatment system and an MWP pulp tower which are sequentially designed; the short fiber treatment system comprises a low-concentration desander, a multi-disc thickener and a short fiber transition slurry tank which are sequentially arranged, and the long fiber treatment system comprises a heavy desander, a fine screening system, a light desander, a multi-disc thickener and a long fiber transition slurry tank which are sequentially arranged;
the preparation method of the slurry of the MWP slurry line comprises the following steps:
A. providing MWP pulp line mixed waste paper, and sequentially performing scattering primary selection, pulping into pulp by a pulper, deslagging by a high-concentration deslagging system, coarse screening and fiber grading screening on the MWP mixed waste paper to screen out short fibers and long fibers; the short fibers are sequentially subjected to deslagging by a low-concentration desander and concentration by a multi-disc concentrator, and then are stored in an MWP pulp tower through a transition pulp tank; the long fiber is sequentially subjected to deslagging by a heavy sand remover, fine screening by a fine screening system, deslagging by a light sand remover and concentrating by a multi-disc concentrator; then storing the slurry in an MWP slurry tower through a slurry-spreading tank;
(2) the DIP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a medium-concentration desander, a fine screening system, a No. 1 flotation tank, a low-concentration desander, a light desander, a No. 1 multi-disc thickener, a heat disperser, a bleaching tower, a No. 2 flotation tank, a No. 2 multi-disc thickener, a transition pulp tank and a DIP pulp tower which are designed in sequence;
the preparation method of the slurry of the DIP slurry line comprises the following steps:
A. providing DIP pulp line mixed waste paper, and sequentially performing primary separation on the DIP mixed waste paper through a bale breaker, pulping into pulp by a pulper, removing high-concentration slag, screening through a coarse screen, removing slag by a medium-concentration slag remover, screening through a fine screen and flotation in a No. 1 flotation tank; concentrating the fine pulp subjected to flotation by a multi-disc thickener, spirally extruding to the concentration of 20% -40%, thermally dispersing by a thermal dispersion machine, bleaching by a bleaching tower, performing flotation by a 2# flotation tank and concentrating by the 2# multi-disc thickener in sequence, reducing and bleaching the concentrated pulp, and storing the pulp in a DIP pulp tower by a transition pulp tank;
(3) the MOW pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a discharging pulp tower, a medium-concentration screening system, a No. 1 flotation tank, a low-concentration desander, a fine screening system, a No. 1 multi-disc thickener, a No. 1 heat disperser, a middle pool, a No. 2 flotation tank, a No. 2 multi-disc thickener, a No. 2 heat disperser, a bleaching tower, a No. 3 flotation tank, a No. 3 multi-disc thickener and an MOW pulp tower which are designed in sequence;
the preparation method of the slurry of the MOW slurry wire comprises the following steps:
A. providing MOW pulp wire mixed waste paper, wherein the MOW pulp wire mixed waste paper is subjected to primary scattering, pulper pulping and pulping, high-concentration deslagging system deslagging, coarse screening impurity screening, medium-concentration screening and 1# flotation tank flotation treatment in sequence by a bale breaker, fine screening, 1# multi-disc thickener concentration and spiral extrusion to 20% -40% concentration, and 1# heat dispersion machine for heat dispersion treatment, and the pulp subjected to heat dispersion treatment enters an intermediate tank; part of the good pulp in the middle tank is sent to a DIP pulp tower; treating the other part of good pulp in the middle tank by a No. 2 flotation tank, concentrating by a No. 2 multi-disc concentrator, thermally dispersing by No. 2 thermal dispersion, carrying out high-concentration oxidation bleaching by a bleaching tower, concentrating by a No. 3 flotation tank and a No. 3 multi-disc concentrator, reducing and bleaching the concentrated pulp, and storing the pulp in a MOW pulp tower;
(4) the ONP pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a medium-concentration screening system, a flotation tank, a low-concentration desander, a fine screening system, a multi-disc thickener, a heat dispersion machine, a transition pulp tank and an ONP pulp tower which are designed in sequence;
the preparation method of the slurry of the ONP slurry line comprises the following steps:
A. providing ONP pulp wire mixed waste paper, sequentially carrying out primary sorting by a bale breaker, pulping by a pulper to form pulp, deslagging by a high-concentration deslagging system, screening impurities by a coarse screen, screening by a three-section medium-concentration screen, then feeding the pulp into a flotation tank, sequentially carrying out deslagging by a three-section low-concentration sand remover, screening by a three-section fine screen, concentrating by a multi-disc concentrator, spirally extruding to 20-40% concentration, carrying out thermal dispersion treatment by a thermal dispersion machine, and then storing the pulp into an ONP pulp tower through a transition tank;
(5) the OCC pulp line comprises a bale breaker, a pulper, a high-concentration desander, a coarse screening system, a medium-concentration desander, a fiber grading screen, a short fiber treatment system, a long fiber treatment system, an OCC transition pool and an OCC pulp tower which are sequentially designed; the long fiber treatment system comprises a heavy sand remover, a fine screening system, a multi-disc thickener and a heat dispersion machine; the short fiber treatment system comprises a low-concentration desander, a light desander, a multi-disc thickener and a heat dispersion machine;
the preparation method of the slurry of the OCC slurry line comprises the following steps:
A. providing OCC pulp line mixed waste paper, and sequentially screening short fibers and long fibers by a bale breaker sorting machine, a pulper for pulping, a high-concentration desanding system for desanding, a coarse screen screening machine, a medium-concentration desander and a classifying screen; the short fibers are sequentially subjected to deslagging by a low-concentration desander and a light desander, concentration by the light desander and a multi-disc concentrator, spiral extrusion to the concentration of 20-30 percent, dispersion by a heat dispersion machine, and then stored in an OCC slurry tower by an OCC transition slurry pool; the long fibers are sequentially subjected to low-concentration removal, heavy sand removal, fine screening and fine screening, concentration by a multi-disc concentrator, spiral extrusion to the concentration of 20-40% and thermal dispersion by a thermal dispersion machine, and then are stored in an OCC slurry tower through an OCC transition slurry pool;
step two, later-stage pulp papermaking; adopting a papermaking system to conduct papermaking on the pulp prepared in the step one; the papermaking system comprises a surface layer flow conveying system, a lining layer flow conveying system, a bottom layer flow conveying system and a core layer flow conveying system; slurry in the MOW slurry tower flows to a surface layer flow system to be processed to form the surface layer, slurry in the DIP slurry tower flows to a lining layer flow system to form the lining layer, slurry in the ONP slurry tower flows to a bottom layer flow system to be processed to form the bottom layer, and slurry in the MWP slurry tower and the OCC slurry tower flows to a core layer flow system to be processed to form the core layer; the surface layer, the lining layer, the core layer and the bottom layer are formed and then compounded into the paperboard.
2. The process for preparing coated grey white board according to claim 1, wherein: the MOW pulp line mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, wherein the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0% -20%): (70% -90%).
3. The process for preparing coated grey white board according to claim 1, wherein: the DIP pulp line mixed waste paper comprises American waste paper, Japanese waste paper and Chinese waste paper, wherein the proportion of the American waste paper, the Japanese waste paper and the Chinese waste paper is (0% -20%): (70% -90%).
4. The process for preparing coated grey white board according to claim 1, wherein: the ONP pulp line mixed waste paper comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, wherein the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (80% -100%) (0% -10%): (0% -10%).
5. The process for preparing coated grey white board according to claim 1, wherein: the MWP pulp line mixed waste paper comprises American waste paper, Chinese hong Kong waste paper and Chinese waste paper, wherein the proportion of the American waste paper, the Chinese hong Kong waste paper and the Chinese waste paper is (0-20%) (70-90%).
6. The process for preparing coated grey white board according to claim 1, wherein: the mixed waste paper of the OCC pulp line comprises American waste paper and Chinese waste paper, wherein the proportion of the American waste paper to the Chinese waste paper is (20% -40%) to (60% -80%).
7. The process for preparing coated grey white board according to claim 1, wherein: in the second step, the core layer flow flowing system comprises a core layer flow box and a core net, and a sandwich net is arranged on the core net.
8. The process for preparing coated grey white board according to claim 1, wherein: in the second step, the compounded paper board is sequentially subjected to squeezing dehydration, front drying dehydration, surface sizing, rear drying dehydration, hard press polishing, coating, hot air drying and soft press polishing, and then enters a winder to be rolled into paper.
9. The process for preparing coated grey white board according to claim 1, wherein: the compounded paper board is dewatered by three squeezing processes, namely groove blind hole squeezing, boot type squeezing and gloss squeezing.
10. The process for preparing coated grey white board according to claim 1, wherein: in the slurry preparation methods of the DIP slurry line, the MOW slurry line and the ONP slurry line, the slag slurry floated by the 1# flotation tank is sent to the MWP slurry line for recycling.
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| CN110219200A (en) * | 2019-04-19 | 2019-09-10 | 东莞建晖纸业有限公司 | Novel coating coated duplex board with grey back center stock preparation process |
| CN110205855A (en) * | 2019-04-19 | 2019-09-06 | 东莞建晖纸业有限公司 | A kind of coating coated duplex board with grey back center stock preparation process |
| CN111663370B (en) * | 2020-06-28 | 2021-04-13 | 浙江金励环保纸业有限公司 | High-strength gray paperboard and preparation method thereof |
| CN111691235B (en) * | 2020-06-28 | 2021-04-13 | 浙江金励环保纸业有限公司 | Gray board paper and preparation method thereof |
| CN112726268A (en) * | 2020-12-23 | 2021-04-30 | 玖龙纸业（太仓）有限公司 | Pulping process of coated grey-bottom white board |
| CN113249998B (en) * | 2021-06-04 | 2023-06-16 | 安德里茨（中国）有限公司 | Pulping system for waste paper |
| CN115976874B (en) * | 2022-11-30 | 2024-05-28 | 东莞建晖纸业有限公司 | Four-layer ash-coated white board paper and five-layer ash-coated white board paper online mutual transfer production method |
| CN115948934A (en) * | 2022-12-12 | 2023-04-11 | 玖龙纸业(天津)有限公司 | Papermaking process flow for recycling waste paper |
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Inventor after: Li Guihua Inventor after: Yang Xiaohui Inventor after: Ran Hu Inventor after: Li Xikang Inventor before: Li Guihua Inventor before: Yang Xiaohui |