CN117431770B - Papermaking process for reducing paper wool in drying area - Google Patents
Papermaking process for reducing paper wool in drying area Download PDFInfo
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- CN117431770B CN117431770B CN202311765663.8A CN202311765663A CN117431770B CN 117431770 B CN117431770 B CN 117431770B CN 202311765663 A CN202311765663 A CN 202311765663A CN 117431770 B CN117431770 B CN 117431770B
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- 238000001035 drying Methods 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 38
- 210000002268 wool Anatomy 0.000 title abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 65
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract 2
- 238000004537 pulping Methods 0.000 claims description 48
- 230000005540 biological transmission Effects 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 9
- 239000004094 surface-active agent Substances 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 239000003595 mist Substances 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 2
- 125000000373 fatty alcohol group Chemical group 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 abstract description 7
- 239000001913 cellulose Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 13
- 150000002191 fatty alcohols Chemical class 0.000 description 6
- 241001397809 Hakea leucoptera Species 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 206010027146 Melanoderma Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 organic matters Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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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
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
- D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/22—Agents rendering paper porous, absorbent or bulky
- D21H21/24—Surfactants
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of papermaking, and particularly relates to a papermaking process for reducing paper wool in a drying area. The paper making process for reducing the paper wool in the drying area comprises the following steps of: the raw materials are long fiber, short fiber and chemical pulp, the mass ratio is 1 (1.5-2) (4-7.5), and the pulp pretreatment, deslagging, impurity removal and cellulose extraction are carried out to improve the fiber quality. Reduces the consumption of the degasifier, avoids the generation of paper wool caused by chemical residue, filters water for molding, and enters a drying area for drying. The papermaking process for reducing the paper wool in the drying area has the advantages of good stability, improving the production efficiency of papermaking, reducing the paper wool of the dried paper and improving the paper quality.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a papermaking process for reducing paper wool in a drying area.
Background
The paper wool in the paper-making drying area refers to fine paper scraps or fiber particles formed by separating fibers or other impurities in paper pulp from the surface of paper in the paper-making process and the drying process of the paper pulp in the drying area.
The paper wool in the paper-making drying area is produced by not only the quality and the organization structure of the fiber in the paper pulp, but also a drying process and the like. The fiber length distribution in the paper pulp is uneven, or short fibers, scraps and other impurities with the average length less than 0.3mm exist, and the unstable fibers are easy to separate from the surface of the paper to form paper wool after the drying process of high temperature (65-110 ℃) and high speed (the running speed of the paper is 700-800 m/min) in a drying area. The paper surface is rough, uneven, or there are fibers that are not sufficiently compacted, and these loose fibers are also prone to break away under the high temperature and high speed conditions of the drying section, forming paper fluff. In addition, the temperature, humidity, air flow speed and other technological parameters of the drying area have influence on the generation of paper wool, for example, the unstable fiber in paper pulp can be caused by the excessively high temperature, unsuitable humidity or excessively high air flow speed of the drying area, the paper wool is formed on the surface of paper, the transmission speed of the paper in the drying area is one of factors for the generation of the paper wool, and if the paper speed is excessively high, the drying time of the drying area is insufficient. Moreover, the moisture on the surface of the paper cannot be evaporated and solidified sufficiently, the fibers are separated to form paper wool, and the state and maintenance condition of the drying area equipment can influence the generation of the paper wool.
The paper quality can be reduced, the paper wool can be attached to the surface of the paper or embedded into the paper, so that the surface of the paper is uneven and rough, the appearance and texture of the paper are affected, and the smoothness of the paper is reduced; secondly, the printing quality is affected, the paper wool is easy to adhere to ink or the ink in the printing process, so that the problems of stain, black spot or blurry on the printed matter are caused, the quality of the printed matter is reduced, and the normal operation of the printing machine is possibly affected; moreover, paper can block paper making equipment and pipelines, so that the production efficiency and the normal operation of the equipment are affected, the equipment is blocked and worn due to accumulation and accumulation of paper wool, even equipment faults are caused, and the maintenance cost is increased; finally, the environment is polluted, a large amount of paper wool can be generated in the papermaking process and possibly enter waste water and waste gas to pollute the environment, and substances such as organic matters, cellulose, ink residues and the like contained in the paper wool have negative influence on the environment, so that the difficulty and cost of waste water treatment and waste gas treatment are increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a paper making process for reducing paper wool in a drying area, which has good stability, improves the production efficiency of paper making, reduces the paper wool of the dried paper and improves the paper quality.
The invention relates to a papermaking process for reducing paper wool in a drying area, which comprises the following steps of:
(1) Raw material selection, pulp pretreatment: the raw materials are long fiber, short fiber and chemical pulp, the mass ratio is 1 (1.5-2) (4-7.5), and the pulp pretreatment, deslagging, impurity removal and cellulose extraction are carried out to improve the fiber quality.
(2) And (3) pulping control: grinding to control the grinding degree, wherein the freeness of the long fibers and the short fibers is 300-400mL, and the freeness of the chemi-mechanical pulp is 420-460mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The dosage of the degasifier is controlled, paper wool generation caused by chemical residue is avoided, water filtering forming is carried out, the paper wool enters a drying area for drying, the drying area is divided into nine groups of drying cylinders, a mist spraying drying cylinder stripper is arranged on the surface of a first group of drying cylinders, and the situation that paper wool is generated due to adhesion of the surface of the drying cylinders to paper is reduced.
The average length of the long fibers is 2-3mm, the average length of the short fibers is 0.7-1.3mm, and the length of the chemi-mechanical pulp is 1-2.2mm.
The long fiber is needle-leaved wood chemical pulp, the short fiber is broad-leaved wood chemical pulp, and the chemical mechanical pulp is chemical mechanical pulp.
The pulp pretreatment comprises deslagging, impurity removal and extraction fiber content of more than 96 wt%.
The pulping adopts a pulping machine, and the pulping specific energy of the pulping machine is 80-82%.
The degasifier is fatty alcohol surfactant, and the dosage is 8-10mL/min; the dryer stripper is mineral oil emulsion with the dosage of 4.0-4.5mL/s.
The drying area is divided into nine groups of drying cylinders, the temperature of the first group of drying cylinders is 60-65 ℃, the humidity is 100-110g/kg of dry air, and the air flow speed is 15 ten thousand + -5000 m 3 /h; the temperature of the second group of drying cylinders is 65-70 ℃, the humidity is 105-115g/kg of dry air, and the air flow speed is 15 ten thousand + -5000 m 3 /h; the temperature of the third group of drying cylinders is 75-80 ℃, the humidity is 115-145g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the fourth group of drying cylinders is 75-90 ℃, the humidity is 145-150g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the fifth group of drying cylinders is 85-95 ℃, the humidity is 145-150g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the sixth group of drying cylinders is 90-100 ℃, the humidity is 135-145g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h; temperature of seventh group of drying cylinders95-105 ℃, 125-135g/kg of dry air with the air flow speed of 16 ten thousand + -5000 m 3 /h; the temperature of the eighth group of drying cylinders is 95-105 ℃, the humidity is 115-125g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h; the temperature of the ninth group of drying cylinders is 95-105 ℃, the humidity is 115-125g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h。
The air flow in the drying cylinder is extracted by an exhaust fan to absorb moisture, different exhaust openings are arranged, and the opening degree of the exhaust openings is set as follows: the first group of drying cylinders are an exhaust port, the opening degree of the operation side is 61-71%, and the opening degree of the transmission side is 61-71%; the second group of drying cylinders are three exhaust openings, the opening degrees of the operation side are 61-71%, 61-71% and 95-100% respectively, and the opening degrees of the transmission side are 61-71%, 61-71% and 61-71% respectively; the third group and the fourth group are four exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 95-100%, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the fifth group of drying cylinders are five exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 95-100%, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the sixth group of drying cylinders are four exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 61-71% respectively, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the seventh group of drying cylinders are provided with five exhaust openings, the opening degrees of the operation sides are 61-71%, 61-71% and 45-55% respectively, and the opening degrees of the transmission sides are 61-71%, 61-71% and 61-71% respectively; the eighth group of drying cylinders are provided with five exhaust openings, the opening degree of the operation side is 45-55%, 45-55% and 45-55%, and the opening degree of the transmission side is 45-55%, 45-55% and 45-55% respectively; the ninth group of drying cylinders are three exhaust openings, the opening of the operation side is 45-55%, 45-55% and 45-55% respectively, and the opening of the transmission side is 45-55%, 45-55% and 45-55% respectively.
The length and the width of the air suction opening are respectively 1m and 0.8m, and the shape of the air suction opening is a sliding door shape.
The paper running speed in the drying area is 700m/min-800m/min.
Specifically, the papermaking process for reducing paper wool in a drying area comprises the following processes:
(1) Raw material selection, pulp pretreatment: selecting raw materials of chemical pulp of long fiber needle wood with the average length of 2-3mm, chemical pulp of short fiber broad-leaved wood with the average length of 0.7-1.3mm and chemical pulp of chemical machine with the length of 1-2.2mm, wherein the mass ratio is 1 (1.5-2) (4-7.5), carrying out pulp pretreatment, deslagging, removing impurities, extracting fiber content of more than 96wt% so as to improve fiber quality.
(2) And (3) pulping control: pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 80% -82%, the grinding degree is controlled by pulping, the freeness of long fibers and short fibers is 300-400mL, and the freeness of chemical pulping is 420-460mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The using amount of the deaerator of the fatty alcohol surfactant is controlled to be 8-10mL/min, the using amount of the deaerator is reduced, paper wool is prevented from being produced due to chemical residues, water is filtered and shaped, the paper is dried in a drying area, a mist spray dryer stripper is adopted on the surface of a first group of dryer which is dried in the drying area, the using amount is 4.0-4.5mL/s, the drying area is divided into nine groups of dryer, the air flow in the dryer is extracted by an extraction fan to absorb moisture, different extraction openings are arranged, the length and the width of each extraction opening are respectively 1m and 0.8m, the shape of each extraction opening is shaped like a sliding door, and the running speed of paper in the drying area is 700m/min-800m/min.
According to the papermaking process for reducing the paper wool in the drying area, the raw materials are selected and treated, and the drying process in the drying area is redesigned cooperatively, so that the production of the paper wool is reduced, the use amount of a degassing agent is reduced, and the influence on the environment is reduced.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the papermaking process for reducing the paper wool in the drying area, the fiber length distribution and the fiber organization structure are adjusted to cooperate with raw material pretreatment, so that the fiber quality is improved, and the problem of paper wool generation is reduced.
(2) According to the papermaking process for reducing the paper wool in the drying area, the process parameters of the drying area, including temperature, humidity and air flow speed, are redesigned, and the problems caused by the paper wool are reduced and the paper quality is improved by precisely controlling the parameters.
(3) According to the papermaking process for reducing the paper wool in the drying area, through redesigning the drying area, the consumption of the degasifier is reduced by more than 2%, the paper wool problem caused by chemical residues is avoided, and the problem of treatment of a large amount of chemical wastewater is also avoided.
Detailed Description
The invention will be further illustrated with reference to specific examples.
The papermaking processes not disclosed in the following examples are all normal processes, and since the papermaking processes are long, and the disclosures of the prior art are sufficient, the processes not described in further detail are all the existing processes, and can be operated by a person skilled in the art.
The fatty alcohol surfactant deaerator used in the following examples was DF-3000, commercially available from Shunkan rubber Co., ltd; the first group of dryer stripper type S71 is commercially available from Shandong Yishi environmental protection New Material Co.
Example 1
The paper making process for reducing the paper wool in the drying area comprises the following steps of:
(1) Raw material selection, pulp pretreatment: selecting long fiber needle wood chemical pulp with the average length of 2-3mm, short fiber broad-leaved wood chemical pulp with the average length of 0.7-1.3mm and chemimechanical pulp with the length of 1-2.2mm, pretreating paper pulp with the mass ratio of 1:2:7, removing slag, removing impurities and extracting cellulose to improve the fiber quality.
(2) And (3) pulping control: pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 80%, the pulping control crushing degree, the freeness of long fibers and short fibers is 350mL, and the freeness of chemical pulp is 440mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The dosage of the fatty alcohol surfactant deaerator is controlled to be 9mL/min, the dosage of the deaerator is reduced, paper wool generation caused by chemical residue is avoided, water filtering forming is carried out, the paper wool enters a drying area for drying, the surface of a first drying cylinder entering the drying area for drying is sprayed with a drying cylinder stripper in a mist form, the dosage is 4.5mL/s, the drying area is divided into nine groups of drying cylinders, and air flow in the drying cylinders is extracted by an extraction fanThe wet type dryer is provided with different air suction openings, the length and the width of the air suction openings are respectively 1m and 0.8m, the shape of the air suction openings is a sliding door, the running speed of paper in a drying area is 750m/min, and the gram weight of the paper is 250g/m 2 。
Example 2
The paper making process for reducing the paper wool in the drying area comprises the following steps of:
(1) Raw material selection, pulp pretreatment: selecting long fiber needle wood chemical pulp with the average length of 2-3mm, short fiber broad-leaved wood chemical pulp with the average length of 0.7-1.3mm and chemimechanical pulp with the length of 1-2.2mm, pretreating paper pulp with the mass ratio of 1:2:7, removing slag, removing impurities and extracting cellulose to improve the fiber quality.
(2) And (3) pulping control: pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 82%, the pulping control crushing degree, the freeness of long fibers and short fibers is 300mL, and the freeness of chemical pulp is 420mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The method is characterized in that the using amount of the fatty alcohol surfactant deaerator is controlled to be 8mL/min, the using amount of the deaerator is reduced, paper wool is prevented from being produced due to chemical residues, water is filtered and formed, the paper is dried in a drying area, a first drying cylinder is dried in the drying area, a mist-spray drying cylinder stripping agent is sprayed on the surface of the first drying cylinder, the using amount of the air is 4.0mL/s, the drying area is divided into nine groups of drying cylinders, air flow in the drying cylinders is extracted and absorbed by an exhaust fan, different exhaust openings are arranged, the length and the width of each exhaust opening are respectively 1m and 0.8m, the shape of each exhaust opening is a sliding door, the running speed of paper in the drying area is 700m/min, and the gram weight of the paper is 250g/m 2 。
Example 3
The paper making process for reducing the paper wool in the drying area comprises the following steps of:
(1) Raw material selection, pulp pretreatment: selecting long fiber needle wood chemical pulp with the average length of 2-3mm, short fiber broad-leaved wood chemical pulp with the average length of 0.7-1.3mm and chemimechanical pulp with the length of 1-2.2mm, carrying out pulp pretreatment, deslagging, removing impurities and extracting cellulose according to the mass ratio of 1:1.5:7.5, so as to improve the fiber quality.
(2) And (3) pulping control: pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 80%, the pulping control crushing degree, the freeness of long fibers and short fibers is 400mL, and the freeness of chemical pulp is 460mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The method is characterized in that the using amount of the fatty alcohol surfactant deaerator is controlled to be 10mL/min, the using amount of the deaerator is reduced, paper wool is prevented from being produced due to chemical residues, water is filtered and formed, the paper is dried in a drying area, a first drying cylinder is dried in the drying area, a mist-spray drying cylinder stripping agent is sprayed on the surface of the first drying cylinder, the using amount of the stripping agent is 4.5mL/s, the drying area is divided into nine groups of drying cylinders, air flow in the drying cylinders is extracted and absorbed by an exhaust fan, different exhaust openings are arranged, the length and the width of each exhaust opening are respectively 1m and 0.8m, the shape of each exhaust opening is a sliding door, the running speed of paper in the drying area is 800m/min, and the gram weight of the paper is 250g/m 2 。
Example 4
The paper making process for reducing the paper wool in the drying area comprises the following steps of:
(1) Raw material selection, pulp pretreatment: selecting long fiber needle wood chemical pulp with the average length of 2-3mm, short fiber broad-leaved wood chemical pulp with the average length of 0.7-1.3mm and chemimechanical pulp with the length of 1-2.2mm, carrying out pulp pretreatment, deslagging, removing impurities and extracting cellulose according to the mass ratio of 1.5:2.5:6, so as to improve the fiber quality.
(2) And (3) pulping control: pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 80%, the pulping control crushing degree, the freeness of long fibers and short fibers is 300mL, and the freeness of chemical pulp is 420mL; according to the paper quality requirement, paper wool generation caused by excessive pulping is avoided.
(3) The use level of the fatty alcohol surfactant deaerator is controlled to be 8mL/min, the use level of the deaerator is reduced, paper wool generation caused by chemical residue is avoided, water filtering forming is carried out, the paper wool enters a drying area for drying, a first drying cylinder is dried in the drying area, a mist-spray drying cylinder stripping agent is adopted on the surface of the first drying cylinder, the use level is 4.0mL/s, the drying area is divided into nine groups of drying cylinders, the air flow in the drying cylinders is extracted and absorbed by an exhaust fan, different exhaust openings are arranged, the length and the width of each exhaust opening are respectively 1m and 0.8m, and the shape of each exhaust opening isIn the shape of a sliding door, the running speed of paper in a drying area is 700m/min, and the gram weight of the paper is 250g/m 2 。
The process parameters of the drying zones used in the above examples 1-4 are shown in table 1, and the opening degree of the suction port used should be set as shown in table 2.
TABLE 1 baking zone Process parameter settings
Table 2 exhaust port data set
Comparative example 1
The comparative example is the same as example 1, but the raw material ratio in step (1) is replaced by long fiber to short fiber to chemi-mechanical pulp mass ratio of 1:4:5, and other preparation processes are the same.
Comparative example 2
This comparative example is identical to example 1, except that the refining ratio of step (2) is increased to 90%, with the other preparation processes being identical.
Comparative example 3
The comparative example was the same as example 1, but the deaerator amount in step (3) was increased to 15mL/min, the air outlet opening was all 100%, the parameters in the baking zone were as shown in Table 3, and the other processes were the same as example 1.
TABLE 3 baking zone temperature
Comparative example 4
This comparative example was identical to example 1, except that the cylinder stripper of step (3) was removed and the other preparation process was identical.
The paper made in the above examples and comparative examples was subjected to the following parameter measurements: paper surface roughness and smoothness were measured using GB/T22881-2008, paper surface glossiness was measured using GM gloss meter (Hangzhou light Tongbo Kogyo Automation technology Co., ltd.), and paper surface whiteness was measured using whiteness meter (Datacolor). The detection results are shown in Table 4.
TABLE 4 detection results
From the above table 4, it can be seen that the paper surface roughness, paper surface glossiness, paper surface whiteness and paper surface smoothness of the paper manufactured by the process of the invention are better, which proves that the preparation method of the invention remarkably reduces the generation of paper fuzz in papermaking. While in comparative example 1, when the ratio of the long fiber, the short fiber and the chemimechanical pulp of the raw materials is changed, the roughness of the paper surface of the prepared paper is obviously increased, and the glossiness of the paper surface is obviously reduced. And after the specific energy of papermaking and pulping prepared in the comparative example 2 is improved, the roughness of paper surface is obviously improved, and other properties are obviously reduced. Comparative example 3 demonstrates that after the amount of deaerator increases, the temperature in the drying zone increases, the opening increases, the air outlet increases, the air flow rate increases, and the paper in the drying zone remains more. In comparative example 4, after the drying cylinder stripping agent was removed, various indexes were lowered, resulting in an increase in the production of paper fluff in papermaking.
Claims (4)
1. A papermaking process for reducing paper fluff in a drying zone, comprising: the method comprises the following steps:
(1) Raw material selection, pulp pretreatment: selecting long fibers, short fibers and chemi-mechanical pulp as raw materials, wherein the mass ratio of the raw materials is 1 (1.5-2) (4-7.5), and carrying out pulp pretreatment;
the average length of the long fibers is 2-3mm, the average length of the short fibers is 0.7-1.3mm, and the length of the chemi-mechanical pulp is 1-2.2mm;
(2) And (3) pulping control: grinding to control the grinding degree, wherein the freeness of the long fibers and the short fibers is 300-400mL, and the freeness of the chemi-mechanical pulp is 420-460mL;
pulping by a pulping machine, wherein the pulping specific energy of the pulping machine is 80% -82%;
(3) Controlling the dosage of the degassing agent to be 8-10mL/min, wherein the degassing agent is fatty alcohol surfactant, filtering water for molding, entering a drying area for drying, dividing the drying area into nine groups of drying cylinders, arranging a mist spraying drying cylinder stripping agent on the surface of the first group of drying cylinders, and the dosage of the drying cylinder stripping agent is mineral oil emulsion and is 4.0-4.5mL/s; the paper running speed in the drying area is 700m/min-800m/min;
the drying area is divided into nine groups of drying cylinders, the temperature of the first group of drying cylinders is 60-65 ℃, the humidity is 100-110g/kg of dry air, and the air flow speed is 15 ten thousand + -5000 m 3 /h; the temperature of the second group of drying cylinders is 65-70 ℃, the humidity is 105-115g/kg of dry air, and the air flow speed is 15 ten thousand + -5000 m 3 /h; the temperature of the third group of drying cylinders is 75-80 ℃, the humidity is 115-145g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the fourth group of drying cylinders is 75-90 ℃, the humidity is 145-150g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the fifth group of drying cylinders is 85-95 ℃, the humidity is 145-150g/kg of dry air, and the air flow speed is 18 ten thousand + -5000 m 3 /h; the temperature of the sixth group of drying cylinders is 90-100 ℃, the humidity is 135-145g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h; the temperature of the seventh group of drying cylinders is 95-105 ℃, the humidity is 125-135g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h; the temperature of the eighth group of drying cylinders is 95-105 ℃, the humidity is 115-125g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h; the temperature of the ninth group of drying cylinders is 95-105 ℃, the humidity is 115-125g/kg of dry air, and the air flow speed is 16 ten thousand + -5000 m 3 /h；
The air flow in the drying cylinder is extracted by an exhaust fan to absorb moisture, different exhaust openings are arranged, and the opening degree of the exhaust openings is set as follows: the first group of drying cylinders are an exhaust port, the opening degree of the operation side is 61-71%, and the opening degree of the transmission side is 61-71%; the second group of drying cylinders are three exhaust openings, the opening degrees of the operation side are 61-71%, 61-71% and 95-100% respectively, and the opening degrees of the transmission side are 61-71%, 61-71% and 61-71% respectively; the third group and the fourth group are four exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 95-100%, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the fifth group of drying cylinders are five exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 95-100%, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the sixth group of drying cylinders are four exhaust openings, the opening degree of the operation side is 95-100%, 95-100% and 61-71% respectively, and the opening degree of the transmission side is 95-100%, 95-100% and 95-100% respectively; the seventh group of drying cylinders are provided with five exhaust openings, the opening degrees of the operation sides are 61-71%, 61-71% and 45-55% respectively, and the opening degrees of the transmission sides are 61-71%, 61-71% and 61-71% respectively; the eighth group of drying cylinders are provided with five exhaust openings, the opening degree of the operation side is 45-55%, 45-55% and 45-55%, and the opening degree of the transmission side is 45-55%, 45-55% and 45-55% respectively; the ninth group of drying cylinders are three exhaust openings, the opening of the operation side is 45-55%, 45-55% and 45-55% respectively, and the opening of the transmission side is 45-55%, 45-55% and 45-55% respectively.
2. The drying zone reduced pile paper making process according to claim 1, wherein: the long fiber is needle-leaved wood chemical pulp, the short fiber is broad-leaved wood chemical pulp, and the chemical mechanical pulp is chemical mechanical pulp.
3. The drying zone reduced pile paper making process according to claim 1, wherein: the pulp pretreatment comprises deslagging, impurity removal and extraction fiber content of more than 96 wt%.
4. The drying zone reduced pile paper making process according to claim 1, wherein: the length and the width of the air suction opening are respectively 1m and 0.8m, and the shape of the air suction opening is a sliding door shape.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105332320A (en) * | 2015-09-28 | 2016-02-17 | 威海翔宇环保科技股份有限公司 | Mineral oil type papermaking drying cylinder stripping agent |
| CN111188224A (en) * | 2020-01-03 | 2020-05-22 | 山东太阳纸业股份有限公司 | Myopia-preventing paper and preparation method thereof |
| CN114960288A (en) * | 2022-05-25 | 2022-08-30 | 山东太阳纸业股份有限公司 | Plastic-free white paper and preparation method thereof |
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| MX2023005251A (en) * | 2020-11-06 | 2023-07-12 | Kimberly Clark Co | High brightness non-wood pulp. |
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| CN105332320A (en) * | 2015-09-28 | 2016-02-17 | 威海翔宇环保科技股份有限公司 | Mineral oil type papermaking drying cylinder stripping agent |
| CN111188224A (en) * | 2020-01-03 | 2020-05-22 | 山东太阳纸业股份有限公司 | Myopia-preventing paper and preparation method thereof |
| CN114960288A (en) * | 2022-05-25 | 2022-08-30 | 山东太阳纸业股份有限公司 | Plastic-free white paper and preparation method thereof |
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