CN113481752A - Ultralow-quantitative corrugated base paper and preparation method thereof - Google Patents
Ultralow-quantitative corrugated base paper and preparation method thereof Download PDFInfo
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- CN113481752A CN113481752A CN202110835885.7A CN202110835885A CN113481752A CN 113481752 A CN113481752 A CN 113481752A CN 202110835885 A CN202110835885 A CN 202110835885A CN 113481752 A CN113481752 A CN 113481752A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims description 38
- 229920001131 Pulp (paper) Polymers 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 17
- 239000010893 paper waste Substances 0.000 claims description 16
- 239000002761 deinking Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000004513 sizing Methods 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 239000000344 soap Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 238000005188 flotation Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- 238000007865 diluting Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 239000010899 old newspaper Substances 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- -1 alkyl ketene dimer Chemical compound 0.000 claims description 2
- 238000010009 beating Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000126 substance Substances 0.000 description 7
- 239000002893 slag Substances 0.000 description 6
- 238000007605 air drying Methods 0.000 description 5
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000834 fixative Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of paper product preparation, and particularly discloses ultra-low-quantitative corrugated base paper and a preparation method thereof. The invention breaks through 40g/m2The quantitative bottleneck of the corrugated base paper can increase the application area of the corrugated board by 1.2 times or more than the application area of the corrugated board under the condition that the ring crush strength index of the product still reaches the standard compared with the similar product under the condition of the same weight. The corrugated base paper obtained by the invention has better paper quality than the disclosed corrugated base paper, and the water absorption value is 30g/m2The longitudinal fracture length is more than 5km, the requirement of the high-speed newsprint machine for converting the paper into the paper can be met, the production efficiency can be kept not to be reduced to the uneconomical industrial standard, namely the daily normal time is kept for more than 22.5 hours.
Description
Technical Field
The invention belongs to the technical field of paper product preparation, and particularly relates to an ultralow-weight corrugated base paper and a preparation method thereof.
Background
The corrugated medium paper is characterized in that the corrugated medium paper is processed into wave-shaped paper by a corrugated roller in the middle of a corrugated board, and needs to have better stiffness, ring crush strength index and fit adaptability. The gram weight of the corrugated base paper commonly used at present is more than 40g/m2Even mainstream products exceed 80g/m2. So that the conventional corrugated base paper cannot downwards break through 40g/m in basis weight2The reason of (3), contain the OCC among the fiber raw materials for use firstly corrugated medium mainstream, and the slurrying process still is not enough meticulous to can get rid of the gooey among the OCC, these matters can be at a large amount of gooey of paper machine approach system adhesion, because the requirement of approach system is very high to the inner wall polished surface, these gooey hardly do not destroy the inner wall and get rid of, cause the irreversible pollution of approach system, traditional corrugated paper technology still makes the gooey pollute the coarse cotton in the press section, it breaks into paper to appear sticking on dry dryer surface, make production can't continuously produce low gram weight corrugated medium finished product.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the invention provides a method for preparing an ultralow-weight corrugated medium.
The invention also aims to provide the ultralow-weight corrugated base paper prepared by the method.
The purpose of the invention is realized by the following scheme:
a preparation method of ultralow-weight corrugated base paper comprises the following steps:
(1) preparation of deinking pulp
Separating to obtain non-OCC components in the waste paper, sending the non-OCC components into a drum pulper to obtain slurry, controlling the pH of the slurry to be alkaline, adding hydrogen peroxide, and removing impurities through a heavy residue remover; feeding the slurry subjected to impurity removal into a front flotation tank, adding industrial soap and diluting the concentration of the slurry, removing ink particles, concentrating the residual slurry, reducing the particle size dispersion of the residual ink and stickies through thermal dispersion, feeding the residual slurry into a rear flotation tank, diluting the slurry again, screening again and removing the ink particles, and concentrating the slurry to obtain deinked slurry;
(2) preparation of corrugated base paper
Adding a neutral sizing agent and an auxiliary agent into deinking pulp; and deslagging and exhausting the obtained pulp, removing solid impurities by a paper machine pressure screen, diluting the pulp, uniformly mixing, and dehydrating and drying to obtain the corrugated base paper.
The waste paper in the step (1) is imported or domestic old newspaper, old impurity paper and mixed office waste paper.
The control temperature of the drum pulper in the step (1) is 70-80 ℃;
and (2) feeding the slurry obtained in the step (1) into a rotary drum shredder to obtain slurry with the mass concentration of 18-22 wt%, preferably 20 wt%.
And (2) the pH value of the slurry in the step (1) is 8-8.5. Preferably, the pH is adjusted to 8-8.5 by adding caustic soda. More preferably, sodium silicate is added to maintain stable pH of the slurry, and the mass ratio of the sodium silicate to the caustic soda is 1-4: 1, preferably 2: 1.
The mass ratio of the hydrogen peroxide to the air-dried slurry in the step (1) is 1-2: 100, respectively; the industrial soap is a solid industrial soap with the fatty acid content of more than 75%, and the mass ratio of the industrial soap to the air-dried slurry is 0.2-0.35: 100.
the concentration of the diluted slurry in the step (1) is 1-1.3 wt%; the concentration of the slurry obtained after the first concentration in the step (1) is 28-30 wt%.
The heat dispersion in the step (1) is to control the specific energy consumption to be 60-70 KWh/ton pulp;
the concentration of the slurry after re-dilution in the step (1) is 1-1.3 wt%; the concentration of the second concentration in the step (1) is 24-26 wt%, and preferably 25 wt%.
The neutral sizing agent in the step (2) is Alkyl Ketene Dimer (AKD); the dosage of the neutral sizing agent is 10-25 kg/ton sizing agent.
The auxiliary agent in the step (2) is at least one of cationic starch, a fixing agent and a retention aid.
And (3) the gas content in the slurry after the gas is exhausted in the step (2) is less than 0.1%.
The concentration of the slurry diluted in the step (2) is 0.5-0.8 wt%.
And (2) the step of dehydrating and drying specifically comprises the steps of dehydrating the pulp through a net part until the dryness reaches more than 18%, dehydrating through a four-roller three-press pressing part until the dryness reaches more than 45%, and drying to obtain the corrugated base paper.
Preferably, raw pulp can be added in the preparation of the corrugated base paper in the step (2); mixing the pulp with deinked pulp, and then carrying out the step (2) to obtain corrugated base paper; the mass ratio of the deinking pulp to the raw pulp is 75-85: 15-25, preferably 80: 20.
the preparation steps of the raw pulp are as follows: sending the chemi-mechanical pulp or the mechanical pulp into a pulp board pulper to obtain pulped pulp with the concentration of 4-5 wt%, entering a latency pool to spread fibers of the chemi-mechanical pulp or the mechanical pulp, then entering a pulp board fluffer, beating the pulped pulp by a pulp grinder to 30-40 DEG SR, and obtaining the raw pulp.
An ultralow-weight corrugated base paper is prepared through the steps.
In the invention, OCC in waste paper is sorted out on one hand, and on the other hand, a heavy slag separator is firstly used in the process to remove solid wax or similar wax substances which may exist in the waste paper, particularly the OCC is often coated. Through two-stage flotation and thermal dispersion, 2-3.5 kg of solid industrial soap with the fatty acid content of more than 75 percent is used for removing other stickies per ton of pulp, so that the residual printing ink ERIC value of waste paper pulp is lower than 200, and the sustainable production of the ultralow-weight corrugated base paper can be ensured. On the other hand, the chemical-mechanical pulp or mechanical pulp with the content less than 20 percent can make up the deficiency of the wet weight of the waste paper.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention breaks through 40g/m2The quantitative bottleneck of the corrugated base paper can increase the application area of the corrugated board by 1.2 times or more than the application area of the corrugated board under the condition that the ring crush strength index of the product still reaches the standard compared with the similar product under the condition of the same weight. The corrugated base paper obtained by the invention has better paper quality than the disclosed corrugated base paper, and the water absorption value is 30g/m2The longitudinal fracture length is more than 5km, the requirement of the high-speed newsprint machine for converting the paper into the paper can be met, the production efficiency can be kept not to be reduced to the uneconomical industrial standard, namely the daily normal time is kept for more than 22.5 hours.
Drawings
FIG. 1 is a flow chart of a pulp preparation process in an ultra-low quantitative corrugated medium and a preparation method thereof
FIG. 2 is a flow chart of a papermaking process in an ultra-low quantitative corrugated base paper and a preparation method thereof
In fig. 1, 1: waste paper bale breaking machine, 2: drum pulper, 3: heavy slag remover, 4: coarse pulp tower, 5: coarse screening, 6: fine screening, 7: front flotation cell, 8: one-stage screw press, 9: heat disperser, 10: post-flotation cell, 11: two-stage screw press, 12: deinking pulp storage tower, 13: cart or flight, 14: pulp pulper, 15: a submergence elimination pool, 16: thick liquid tower of thick liquid board, 17: pulp fluffer, 18: refiner, 19: raw pulp tower, 20: a paper machine pulp tower,
in fig. 2, 21: deinking pulp pond, 22: mixed pulp tank, 23: pulping tank, 24: fan pump, 25: slag separator, 26: degasser, 27: paper machine press screen, 28: headbox, 29: mesh portion, 30: press section, 31: drying section, 32: winder, 33: rewinding machine, 34: and (7) a warehouse.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
The reagents used in the examples are commercially available without specific reference.
The pulp preparation process is divided into the necessary deinking pulp preparation and optionally the virgin pulp preparation. In the deinking pulp preparation process, firstly, the packed waste paper is scattered through a bale breaker, unusable substances and OCC are manually sorted out, then the waste paper is conveyed into a drum pulper through a chain plate, the drum pulper is controlled at the temperature of 70-80 ℃, caustic soda is added to control the pH value to be 8-8.5, the ratio of sodium silicate to caustic soda is 2:1 (commodity mass ratio), the pulp concentration of the drum pulper is 20%, hydrogen peroxide is added to be 1.0-2.0%, then a heavy slag separator, a coarse screen and a fine screen are used for removing large-size unusable substances and fine sticky substances, industrial soap is added to be about 1% when the waste paper enters a front flotation tank, the concentration is controlled to be 1-1.3%, ink particles are floated and concentrated to be 28-30% through a screw press, the specific energy consumption is 60-70 KWh/ton pulp through the thermal dispersion control, so that the residual ink and sticky substances are dispersed to a basically harmless particle size level, when the deinked pulp enters the rear floating tank, the concentration is controlled to be 1.0 percent, the ink particles are floated for the second time, and the deinked pulp is concentrated to be 25 percent by the two-section screw press again to obtain deinked pulp with the ERIC value less than 200 and is placed in a deinking pulp storage tower. In the primary pulp preparation process, firstly, lump or wet chemi-mechanical pulp or mechanical pulp is pushed into a pulp board pulper by a cart or a chain plate feeding mode, the pulping concentration is 4-5%, then the chemi-mechanical pulp or mechanical pulp fibers are spread out after entering a latency pool, stored in a pulp board coarse pulp tower, then enter a pulp board fluffer, and are beaten to 30-40oSR by a pulping machine, and then are placed in a primary pulp tower.
Deinked pulp enters a deinking pulp tank from a deinking pulp storage tower, optional raw pulp enters a mixed pulp tank from a raw pulp board tower, deinked pulp is mixed and sequentially passes through the mixed pulp tank and a pulp forming tank, a neutral sizing agent is added to meet the requirement of a water absorption value, the rest papermaking chemicals are selected and added according to the paper quality and the continuity of a papermaking process, the obtained pulp is conveyed into a slag separator for further slag removal, then residual air in the pulp is separated out in a gas separator, the air content of the pulp is reduced to be below 0.1 percent, the degassed pulp flows into a fan pump under the action of gravity, the final solid impurities are removed through a pressure screen of a paper machine, the pulp is conveyed to a head box to dilute the pulp to be 0.5-0.8 percent, pulp flow with consistent degree is formed by using a pulp distribution and leveling pipe of the head box, net part dryness of the dewatered pulp outlet part reaches more than 18 percent through net clamping formation in a four-roll three-press part, at least reaching 45 percent of dryness, then drying in a single-row drying cylinder type drying part, reeling by a winder, rewinding, cutting and warehousing by a rewinder.
Example 1
The corrugated base paper adopts deinking pulp (the total air drying amount is 1000 kilograms) prepared from 500 kilograms of imported American waste 8# air drying amount, 200 kilograms of European waste A9 air drying amount, 100 kilograms of Chinese hong Kong district forest paper air drying amount, 150 kilograms of Chinese hong Kong district old newspaper air drying amount and 50 kilograms of European 37# waste paper, and 10-15 kilograms of AKD sizing agent and Jiangsu Fu vast retention aid VG 727200 g are added in the sizing process according to the preparation process of the corrugated paper pulp and the preparation process of the corrugated base paper.
Prepared 40g/m2The breaking length of the finished corrugated base paper is 5KM, and the water absorption value of the finished corrugated base paper is 30g/m2The water content of the finished paper is 7.5 percent, and the tightness is 0.58g/cm2Burst index of 1.6kPa m2/g。
Example 2
The corrugated base paper is prepared from 150 kg of air-dry weight of inland old newspaper, 500 kg of air-dry weight of inland mixed office waste paper, 50 kg of air-dry weight of forest paper in China hong Kong area and 100 kg of air-dry weight of old newspaper in China hong Kong area, and 200 kg of chemi-mechanical pulp (air-dry weight), according to the preparation process of the corrugated paper pulp and the preparation process of the corrugated base paper, 10-15kg of AKD sizing agent, Jiangsu Fu vast retention aid VG 727200 g, preferably 880L 3kg of Ruian cationic starch and PPT-400600 g of a fixative fixed by Pacific chemical company are added in the pulp sizing process.
Prepared 40g/m2The breaking length of the formed paper of the corrugated base paper is 5.2KM, and the water absorption value of the formed paper is 25g/m2The water content of the finished paper is 7 percent, and the tightness is 0.54g/cm2Burst index of 1.8kPa m2/g。
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of ultralow-weight corrugated base paper is characterized by comprising the following steps:
(1) preparation of deinking pulp
Separating to obtain non-OCC components in the waste paper, sending the non-OCC components into a drum pulper to obtain slurry, controlling the pH of the slurry to be alkaline, adding hydrogen peroxide, and removing impurities through a heavy residue remover; feeding the slurry subjected to impurity removal into a front flotation tank, adding industrial soap, diluting the concentration of the slurry, and removing ink particles; concentrating the residual slurry, reducing the particle size dispersion of the residual ink and the adhesive through thermal dispersion, sending the residual ink and the adhesive into a rear floating tank, diluting the slurry again, screening again and removing ink particles, and concentrating the slurry to obtain deinked slurry;
(2) preparation of corrugated base paper
Adding a neutral sizing agent and an auxiliary agent into deinking pulp; and deslagging and exhausting the obtained pulp, removing solid impurities by a paper machine pressure screen, diluting the pulp, uniformly mixing, and dehydrating and drying to obtain the corrugated base paper.
2. The method of claim 1, wherein: the waste paper in the step (1) is at least one of imported or domestic old newspaper, old impurity paper and mixed office waste paper.
3. The method of claim 1, wherein: and (2) feeding the slurry into a rotary drum paper shredder in the step (1) to obtain slurry with the mass concentration of 18-22 wt%.
4. The method of claim 1, wherein: the control temperature of the drum pulper in the step (1) is 70-80 ℃; and (2) the pH value of the slurry in the step (1) is 8-8.5.
5. The method of claim 1, wherein:
the mass ratio of the hydrogen peroxide to the air-dried slurry in the step (1) is 1-2: 100, respectively; the mass ratio of the industrial soap to the air-dried slurry is 0.2-0.35: 100, respectively;
the concentration of the diluted slurry in the step (1) is 1-1.3 wt%; the concentration of the slurry obtained after the first concentration in the step (1) is 28-30 wt%;
the concentration of the slurry after re-dilution in the step (1) is 1-1.3 wt%; and (2) after the second concentration in the step (1), the concentration is 24-26 wt%.
6. The method of claim 1, wherein:
the neutral sizing agent in the step (2) is alkyl ketene dimer; the dosage of the neutral sizing agent is 10-25 kg/ton sizing agent; the auxiliary agent in the step (2) is at least one of cationic starch, a fixing agent and a retention aid.
7. The method of claim 1, wherein: the gas content in the slurry after the gas is exhausted in the step (2) is less than 0.1 percent; the concentration of the slurry diluted in the step (2) is 0.5-0.8 wt%; and (2) the step of dehydrating and drying specifically comprises the steps of dehydrating the pulp through a net part until the dryness reaches more than 18%, dehydrating through a four-roller three-press pressing part until the dryness reaches more than 45%, and drying to obtain the corrugated base paper.
8. The method of claim 1, wherein: and (3) during the preparation of the corrugated base paper in the step (2), adding raw pulp, mixing the raw pulp with deinking pulp, and then obtaining the corrugated base paper through the step (2).
9. The method of claim 1, wherein: the preparation steps of the raw pulp are as follows: sending the chemi-mechanical pulp or the mechanical pulp into a pulp board pulper to obtain pulped pulp with the concentration of 4-5 wt%, entering a latency pool to spread fibers of the chemi-mechanical pulp or the mechanical pulp, then entering a pulp board fluffer, beating the pulped pulp by a pulp grinder to 30-40 DEG SR, and obtaining the raw pulp.
10. An ultra-low basis weight corrugated medium, which is prepared by the method of any one of claims 1 to 9.
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| CN108660831A (en) * | 2018-04-02 | 2018-10-16 | 东莞市泰昌纸业有限公司 | A kind of production method for producing the paper pulp of corrugating medium |
| CN111118956A (en) * | 2019-12-23 | 2020-05-08 | 中山联合鸿兴造纸有限公司 | Production method of regenerated high-strength corrugated base paper with ultralow gram weight |
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Application publication date: 20211008 |