CN111910461A - Production method for reproducing corrugated paper by using corrugated waste paper - Google Patents
Production method for reproducing corrugated paper by using corrugated waste paper Download PDFInfo
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- CN111910461A CN111910461A CN202010799656.XA CN202010799656A CN111910461A CN 111910461 A CN111910461 A CN 111910461A CN 202010799656 A CN202010799656 A CN 202010799656A CN 111910461 A CN111910461 A CN 111910461A
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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
- D21F11/12—Making corrugated paper or board
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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
- D21B1/342—Mixing apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of corrugated paper, and particularly relates to a production method for reproducing corrugated paper by using corrugated waste paper, which comprises the following steps: (1) pulping to obtain waste paper raw pulp; (2) washing, coarse screening, fine screening and desanding to obtain waste paper primary pulp; (3) preparing needle-leaved wood fiber primary pulp and manioc waste fiber primary pulp; (4) preparing an active additive; (5) mixing needle-leaved wood fiber primary pulp, manioc waste fiber primary pulp and waste paper primary pulp; (6) mixing the mixed pulp with an active additive to obtain papermaking primary pulp; (7) the fibers in the papermaking primary pulp are uniformly dispersed; (8) papermaking, squeezing and drying to obtain corrugated base paper; the invention can reduce the waste of resources, ensure the recycling of resources, lead the papermaking work to be more energy-saving and environment-friendly, adopt the mode of combining stirring and ultrasonic wave, lead the pulping speed to be faster, lead the pulp yield to be higher, improve the quality of paper and improve the strength and the tensile property of the paper.
Description
Technical Field
The invention belongs to the technical field of corrugated paper, and particularly relates to a production method for reconstructing corrugated paper by using corrugated waste paper.
Background
Paper mill among the prior art, when producing corrugated paper, mostly can choose to retrieve the pulping through the flute waste paper for use, even use recycled paper pulping, use the process of waste paper pulping, mainly beat the pulpiness into again with waste paper, retrieve fibre wherein and carry out the corrugating paper of once more again, nevertheless retrieve the in-process of pulping papermaking through the corrugated paper waste material, the efficiency of pulping reduces, and the thick liquids extraction rate is lower, causes the wasting of resources easily to also environmental protection.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method for reproducing corrugated paper by using corrugated waste paper.
The invention relates to a production method for reconstructing corrugated paper by using corrugated waste paper, which comprises the following steps:
(1) sending corrugated waste paper into an ultrasonic pulping device, wherein the ultrasonic pulping device comprises a pulping barrel, stirring rods are radially arranged on the pulping barrel and driven to rotate by an external driving device, a plurality of stirring blades are transversely arranged on the surface of each stirring rod, a plurality of ultrasonic frequency conversion rods are arranged on the side surface of the pulping barrel, the ultrasonic frequency conversion rods are connected with an external ultrasonic generating device, the output ends of the ultrasonic frequency conversion rods penetrate through the side surface of the pulping barrel and are arranged towards the inside of the pulping barrel, the external driving device drives the stirring rods to rotate to stir the corrugated waste paper, and ultrasonic waves are transmitted into the pulping barrel through the ultrasonic frequency conversion rods to pulp the corrugated waste paper in the pulping barrel to obtain waste paper raw pulp;
(2) sequentially feeding the raw pulp of the waste paper into a washing device, a coarse screening device, a fine screening device and a desanding device for washing, coarse screening, fine screening and desanding treatment to obtain raw pulp of the waste paper;
(3) respectively sending the softwood and the cassava dregs into an ultrasonic pulping device for pulping to obtain softwood fiber primary pulp and cassava dreg fiber primary pulp, and sequentially sending the softwood fiber primary pulp and the cassava dreg fiber primary pulp into a washing device, a coarse screening device, a fine screening device and a sand removal device for washing, coarse screening, fine screening and sand removal treatment to obtain softwood fiber primary pulp and cassava dreg fiber primary pulp, wherein the concentrations of the softwood fiber primary pulp and the cassava dreg fiber primary pulp are controlled to be 5% -8%;
(4) mixing cellulase, lipase and laccase according to the proportion of 1: 2: 2, mixing and uniformly stirring to obtain an active additive;
(5) conveying the softwood fiber primary pulp and the cassava residue fiber primary pulp prepared in the step (3) into the waste paper primary pulp, and stirring the materials and the waste paper primary pulp until the materials and the waste paper primary pulp are uniformly mixed to obtain mixed pulp, wherein the mass ratio of the softwood fiber primary pulp to the cassava residue fiber primary pulp to the waste paper primary pulp is 1: 1: 5, stirring for 5min to 10min at a stirring speed of 120r/min to 140 r/min;
(6) and (3) conveying the mixed slurry to a slurry mixing tank, adding the active additive prepared in the step (4) into the slurry mixing tank, and stirring the active additive and the mixed slurry until the active additive and the mixed slurry are uniformly mixed, wherein the mass ratio of the mixed slurry to the active additive in the slurry mixing tank is 150: 1-100: 1, uniformly mixing the active additive and the mixed slurry, and then sealing and standing for 1-2 hours to obtain papermaking primary pulp;
(7) adding the papermaking primary pulp into a defibrator, adding polyacrylamide into the papermaking primary pulp, and uniformly stirring the polyacrylamide and the papermaking primary pulp for defibering, wherein the mass ratio of the papermaking primary pulp to the polyacrylamide is 30: 1-15: 1, stirring for 20-30 min at a rotation speed of 100-150 r/min to uniformly disperse fibers in the papermaking primary pulp;
(8) and (2) feeding the papermaking primary pulp with uniformly dispersed fibers into a papermaking pond for papermaking, depositing the fibers and auxiliary materials in the papermaking primary pulp on a net surface to form uniform wet paper sheets, and squeezing and drying the formed wet paper sheets to obtain the corrugated base paper.
Furthermore, before the corrugated waste paper is sent to the ultrasonic wave pulping device for pulping in the step (1), the method further comprises the steps of firstly adding clear water into the corrugated waste paper and soaking the corrugated waste paper for 8-10 h, and then cooking the mixture of the corrugated waste paper and the water, wherein the cooking temperature is 40-50 ℃.
Furthermore, the fine screen device in the step (2) comprises a first-stage fine screen and a second-stage fine screen, the desanding device comprises a first-stage desander and a second-stage desander, the waste paper pulp after coarse screening is conveyed to the first-stage fine screen for deslagging, and then conveyed to the first-stage desander for desanding, the tailings discharged from the first-stage fine screen are conveyed to the second-stage fine screen for deslagging again, and the waste paper pulp obtained after deslagging by the second-stage fine screen is conveyed to the first-stage desander for desanding.
Furthermore, the fine screen device in the step (2) further comprises a three-section fine screen, tailings discharged from the two-section fine screen are sent to the three-section fine screen for deslagging again, waste paper pulp obtained after deslagging by the three-section fine screen is sent to a one-section desander for desanding, and tailings discharged from the three-section fine screen are sent to the two-section fine screen for deslagging again.
Furthermore, the desanding device in the step (2) further comprises a three-section desander, tailings discharged by the first-section desander are conveyed to the second-section desander for desanding again, waste paper pulp obtained after desanding by the second-section descaler is conveyed to the first-section desander for desanding again, and tailings discharged by the second-section desander are conveyed to a waste residue treatment tank.
Furthermore, the pulping beating degree of the waste paper primary pulp is controlled to be 40-50 DEG SR, and the pulping concentration of the waste paper primary pulp is controlled to be 7-9%.
Furthermore, in the step (7), a sizing agent and a papermaking filler are added into the waste paper primary pulp, wherein the sizing agent comprises saponified rosin size, cationic rosin size and dispersed rosin size, and the papermaking seasoning comprises talcum powder and calcium carbonate.
The method has the advantages that the pulp which can be used for papermaking is extracted from the corrugated waste paper, so that the waste of resources can be reduced, the recycling of resources is ensured, the papermaking work is more energy-saving and environment-friendly, the pulping speed is higher and the pulp yield is higher by adopting a mode of combining stirring and ultrasonic wave when the corrugated waste paper is pulped, the softwood fiber primary pulp and the cassava residue fiber primary pulp are added into the waste paper primary pulp, the quality of paper is improved, and the strength and the tensile resistance of the paper are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The invention provides a production method for reconstructing corrugated paper by using corrugated waste paper, which comprises the following steps:
(1) adding clear water into corrugated waste paper, soaking the corrugated waste paper for 8-10 h, cooking a mixture of the corrugated waste paper and water at a temperature of preferably 40-50 ℃, sending the corrugated waste paper into an ultrasonic pulping device, wherein the ultrasonic pulping device comprises a pulping barrel, stirring rods are radially arranged on the pulping barrel and driven to rotate by an external driving device, a plurality of stirring blades are transversely arranged on the surfaces of the stirring rods, a plurality of ultrasonic frequency conversion rods are arranged on the side surfaces of the pulping barrel and connected with an external ultrasonic generating device, output ends of the ultrasonic frequency conversion rods penetrate through the side surfaces of the pulping barrel and are arranged towards the inside of the pulping barrel, the stirring rods are driven to rotate by the external driving device to stir the corrugated waste paper, and ultrasonic waves are conducted into the pulping barrel through the ultrasonic frequency conversion rods, the corrugated waste paper is pulped by combining stirring and ultrasonic waves, so that the pulping efficiency and the pulp yield of the corrugated waste paper are improved;
(2) sequentially feeding the raw waste paper pulp into a washing device, a coarse screening device, a fine screening device and a desanding device for washing, coarse screening, fine screening and desanding treatment to obtain raw waste paper pulp, wherein the pulp beating degree of the raw waste paper pulp is controlled to be 40-50 DEG SR, and the pulp concentration of the raw waste paper pulp is controlled to be 7-9%;
(3) cleaning the softwood and the cassava residues, respectively sending the cleaned softwood and the cassava residues into corresponding ultrasonic pulping devices for pulping to obtain softwood fiber primary pulp and cassava residue fiber primary pulp, sequentially sending the softwood fiber primary pulp and the cassava residue fiber primary pulp into a washing device, a coarse screening device, a fine screening device and a sand removal device for washing, coarse screening, fine screening and sand removal treatment to obtain softwood fiber primary pulp and cassava residue fiber primary pulp, and controlling the concentrations of the softwood fiber primary pulp and the cassava residue fiber primary pulp to be 5-8%;
(4) mixing cellulase, lipase and laccase according to the proportion of 1: 2: 2, mixing and uniformly stirring to obtain an active additive, wherein the active additive is used for initiating slurry;
(5) conveying the softwood fiber primary pulp and the cassava residue fiber primary pulp prepared in the step (3) into the waste paper primary pulp, and stirring the materials and the waste paper primary pulp until the materials and the waste paper primary pulp are uniformly mixed to obtain mixed pulp, wherein the mass ratio of the softwood fiber primary pulp to the cassava residue fiber primary pulp to the waste paper primary pulp is 1: 1: 5, stirring for 5-10 min at a stirring speed of 120-140 r/min, and adding the softwood fiber primary pulp to improve the strength of the paper and enable the paper to be stretched to a certain extent, so that the cassava residue fiber primary pulp is long in fiber length and beneficial to improving the quality of the paper;
(6) and (3) conveying the mixed slurry to a slurry mixing tank, adding the active additive prepared in the step (4) into the slurry mixing tank, and stirring the active additive and the mixed slurry until the active additive and the mixed slurry are uniformly mixed, wherein the mass ratio of the mixed slurry to the active additive in the slurry mixing tank is 150: 1-100: 1, uniformly mixing the active additive and the mixed slurry, and then sealing and standing for 1-2 hours to obtain papermaking primary pulp;
(7) adding the papermaking primary pulp into a defibrator, adding polyacrylamide into the papermaking primary pulp, and uniformly stirring the polyacrylamide and the papermaking primary pulp for defibering, wherein the mass ratio of the papermaking primary pulp to the polyacrylamide is 30: 1-15: 1, stirring for 20-30 min at a rotation speed of 100-150 r/min to uniformly disperse fibers in the papermaking primary pulp;
(8) and (2) feeding the papermaking primary pulp with uniformly dispersed fibers into a papermaking pond for papermaking, depositing the fibers and auxiliary materials in the papermaking primary pulp on a net surface to form uniform wet paper sheets, and squeezing and drying the formed wet paper sheets to obtain the corrugated base paper.
According to the production method for reconstructing the corrugated paper by using the corrugated waste paper, provided by the invention, the pulp which can be used for papermaking is extracted from the corrugated waste paper, so that the waste of resources can be reduced, the recycling of resources is ensured, the papermaking work is more energy-saving and environment-friendly, when the corrugated waste paper is pulped, the pulping speed is higher and the pulp yield is higher by adopting a mode of combining stirring and ultrasonic wave, the softwood fiber primary pulp and the cassava residue fiber primary pulp are added into the waste paper primary pulp, the quality of the paper is improved, and the strength and the tensile resistance of the paper are improved.
The fine screen device in the step (2) comprises a first-stage fine screen, a second-stage fine screen and a third-stage fine screen, the desanding device comprises a first-stage desander, a second-stage desander and a third-stage desander, the waste paper pulp after coarse screening is conveyed into the first-stage fine screen for deslagging, then conveyed into the first-stage desander for desanding, the tailings discharged from the first-stage fine screen are conveyed into the second-stage fine screen for deslagging again, and the waste paper pulp obtained after deslagging by the second-stage fine screen is conveyed into the first-stage desander for desanding. And conveying the tailings discharged from the second-stage fine screen into a third-stage fine screen for secondary deslagging, conveying the waste paper pulp subjected to deslagging by the third-stage fine screen into a first-stage desander for desanding, and conveying the tailings discharged from the third-stage fine screen into the second-stage fine screen for secondary deslagging. Conveying the tailings discharged by the first-stage desander to a second-stage desander for secondary desanding, conveying the waste paper pulp obtained after desanding by the second-stage desander to the first-stage desander for secondary desanding, and conveying the tailings discharged by the second-stage desander to a waste residue treatment tank. The circulation is used for deslagging and separating the semi-finished slurry and the tailings, so that the maximum slurry extraction can be ensured, the waste is avoided, and the pulping work is more environment-friendly and energy-saving.
In the invention, a sizing agent and a papermaking filler are added into the waste paper primary pulp in the step (7), wherein the sizing agent comprises saponified rosin size, cationic rosin size and dispersed rosin size, and the papermaking seasoning comprises talcum powder and calcium carbonate.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. A production method for reproducing corrugated paper by using corrugated waste paper is characterized by comprising the following steps:
(1) sending corrugated waste paper into an ultrasonic pulping device, wherein the ultrasonic pulping device comprises a pulping barrel, stirring rods are radially arranged on the pulping barrel and driven to rotate by an external driving device, a plurality of stirring blades are transversely arranged on the surface of each stirring rod, a plurality of ultrasonic frequency conversion rods are arranged on the side surface of the pulping barrel, the ultrasonic frequency conversion rods are connected with an external ultrasonic generating device, the output ends of the ultrasonic frequency conversion rods penetrate through the side surface of the pulping barrel and are arranged towards the inside of the pulping barrel, the external driving device drives the stirring rods to rotate to stir the corrugated waste paper, and ultrasonic waves are transmitted into the pulping barrel through the ultrasonic frequency conversion rods to pulp the corrugated waste paper in the pulping barrel to obtain waste paper raw pulp;
(2) sequentially feeding the raw pulp of the waste paper into a washing device, a coarse screening device, a fine screening device and a desanding device for washing, coarse screening, fine screening and desanding treatment to obtain raw pulp of the waste paper;
(3) respectively sending the softwood and the cassava dregs into an ultrasonic pulping device for pulping to obtain softwood fiber primary pulp and cassava dreg fiber primary pulp, and sequentially sending the softwood fiber primary pulp and the cassava dreg fiber primary pulp into a washing device, a coarse screening device, a fine screening device and a sand removal device for washing, coarse screening, fine screening and sand removal treatment to obtain softwood fiber primary pulp and cassava dreg fiber primary pulp, wherein the concentrations of the softwood fiber primary pulp and the cassava dreg fiber primary pulp are controlled to be 5% -8%;
(4) mixing cellulase, lipase and laccase according to the proportion of 1: 2: 2, mixing and uniformly stirring to obtain an active additive;
(5) conveying the softwood fiber primary pulp and the cassava residue fiber primary pulp prepared in the step (3) into the waste paper primary pulp, and stirring the materials and the waste paper primary pulp until the materials and the waste paper primary pulp are uniformly mixed to obtain mixed pulp, wherein the mass ratio of the softwood fiber primary pulp to the cassava residue fiber primary pulp to the waste paper primary pulp is 1: 1: 5, stirring for 5min to 10min at a stirring speed of 120r/min to 140 r/min;
(6) and (3) conveying the mixed slurry to a slurry mixing tank, adding the active additive prepared in the step (4) into the slurry mixing tank, and stirring the active additive and the mixed slurry until the active additive and the mixed slurry are uniformly mixed, wherein the mass ratio of the mixed slurry to the active additive in the slurry mixing tank is 150: 1-100: 1, uniformly mixing the active additive and the mixed slurry, and then sealing and standing for 1-2 hours to obtain papermaking primary pulp;
(7) adding the papermaking primary pulp into a defibrator, adding polyacrylamide into the papermaking primary pulp, and uniformly stirring the polyacrylamide and the papermaking primary pulp for defibering, wherein the mass ratio of the papermaking primary pulp to the polyacrylamide is 30: 1-15: 1, stirring for 20-30 min at a rotation speed of 100-150 r/min to uniformly disperse fibers in the papermaking primary pulp;
(8) and (2) feeding the papermaking primary pulp with uniformly dispersed fibers into a papermaking pond for papermaking, depositing the fibers and auxiliary materials in the papermaking primary pulp on a net surface to form uniform wet paper sheets, and squeezing and drying the formed wet paper sheets to obtain the corrugated base paper.
2. The method for producing corrugated paper using corrugated waste paper as claimed in claim 1, wherein before the step (1) of feeding the corrugated waste paper into the ultrasonic wave pulping apparatus for pulping, the method further comprises adding clean water to the corrugated waste paper and soaking the corrugated waste paper for 8 to 10 hours, and then cooking the mixture of the corrugated waste paper and water at a temperature of 40 to 50 ℃.
3. The method according to claim 1, wherein the fine screen device in step (2) comprises a first-stage fine screen and a second-stage fine screen, the desanding device comprises a first-stage desander and a second-stage desander, the coarse screened waste paper pulp is conveyed to the first-stage fine screen for deslagging, then conveyed to the first-stage desander for desanding, the tailings discharged from the first-stage fine screen are conveyed to the second-stage fine screen for deslagging again, and the waste paper pulp obtained after deslagging by the second-stage fine screen is conveyed to the first-stage desander for desanding.
4. The method according to claim 3, wherein the fine screen device in step (2) further comprises a third fine screen, tailings discharged from the second fine screen are fed into the third fine screen to remove the slag again, waste paper pulp obtained after the slag removal by the third fine screen is fed into a first sand remover to remove sand, and tailings discharged from the third fine screen are fed into the second fine screen to remove the slag again.
5. The method according to claim 3, wherein the desanding device in step (2) further comprises a third desander, the tailings discharged from the first desander are conveyed to the second desander for further desanding, the waste paper pulp obtained after desanding by the second desander is conveyed to the first desander for further desanding, and the tailings discharged from the second desander are conveyed to the waste residue treatment tank.
6. The method for producing corrugated paper using corrugated waste paper as claimed in claim 1, wherein the beating degree of the primary pulp of waste paper is controlled to 40-50 ° SR and the pulp concentration of the primary pulp of waste paper is controlled to 7-9%.
7. The method according to claim 1, wherein a sizing agent and a papermaking filler are added to the waste paper primary pulp in the step (7), wherein the sizing agent comprises saponified rosin size, cationic rosin size and dispersed rosin size, and the papermaking seasoning comprises talc powder and calcium carbonate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010799656.XA CN111910461A (en) | 2020-08-11 | 2020-08-11 | Production method for reproducing corrugated paper by using corrugated waste paper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010799656.XA CN111910461A (en) | 2020-08-11 | 2020-08-11 | Production method for reproducing corrugated paper by using corrugated waste paper |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525004A (en) * | 2003-09-17 | 2004-09-01 | 浙江蓝星科技有限公司 | Processing method for regenerative semi-chemical corrugated paper |
| CN101413225A (en) * | 2008-11-14 | 2009-04-22 | 广西明阳环保纸模制品有限公司 | Method for producing corrugated paper and textile spool paper by manioc slag and wine stillage slag |
| CN103103866A (en) * | 2013-01-25 | 2013-05-15 | 华南农业大学 | Method for blending corrugating base paper by utilizing secondary fiber after anaerobic digestion of paper mill sludge |
| CN108729281A (en) * | 2018-04-26 | 2018-11-02 | 东莞市泰昌纸业有限公司 | A method of utilizing paper mill sludge pyrolysis recycle corrugated paper |
| CN110924216A (en) * | 2019-11-14 | 2020-03-27 | 东莞顺裕纸业有限公司 | Method for reconstructing corrugated paper by using waste paper |
-
2020
- 2020-08-11 CN CN202010799656.XA patent/CN111910461A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525004A (en) * | 2003-09-17 | 2004-09-01 | 浙江蓝星科技有限公司 | Processing method for regenerative semi-chemical corrugated paper |
| CN101413225A (en) * | 2008-11-14 | 2009-04-22 | 广西明阳环保纸模制品有限公司 | Method for producing corrugated paper and textile spool paper by manioc slag and wine stillage slag |
| CN103103866A (en) * | 2013-01-25 | 2013-05-15 | 华南农业大学 | Method for blending corrugating base paper by utilizing secondary fiber after anaerobic digestion of paper mill sludge |
| CN108729281A (en) * | 2018-04-26 | 2018-11-02 | 东莞市泰昌纸业有限公司 | A method of utilizing paper mill sludge pyrolysis recycle corrugated paper |
| CN110924216A (en) * | 2019-11-14 | 2020-03-27 | 东莞顺裕纸业有限公司 | Method for reconstructing corrugated paper by using waste paper |
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