CN116289289A - Method for producing fluorine-free oil-proof paper by using fourdrinier vat paper machine - Google Patents
Method for producing fluorine-free oil-proof paper by using fourdrinier vat paper machine Download PDFInfo
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- CN116289289A CN116289289A CN202310222389.3A CN202310222389A CN116289289A CN 116289289 A CN116289289 A CN 116289289A CN 202310222389 A CN202310222389 A CN 202310222389A CN 116289289 A CN116289289 A CN 116289289A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000004513 sizing Methods 0.000 claims abstract description 70
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- 238000012546 transfer Methods 0.000 claims abstract description 25
- 238000004537 pulping Methods 0.000 claims abstract description 24
- 238000011010 flushing procedure Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010009 beating Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 239000003292 glue Substances 0.000 claims description 31
- 229920002472 Starch Polymers 0.000 claims description 29
- 235000019698 starch Nutrition 0.000 claims description 29
- 239000008107 starch Substances 0.000 claims description 29
- 125000002091 cationic group Chemical group 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 12
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 8
- 244000007853 Sarothamnus scoparius Species 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000011121 hardwood Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000011122 softwood Substances 0.000 claims description 6
- 238000010025 steaming Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 239000005871 repellent Substances 0.000 claims 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 6
- 238000010790 dilution Methods 0.000 description 5
- 239000012895 dilution Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 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
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002939 oilproofing Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
-
- 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
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
-
- 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
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- 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
- D21H21/16—Sizing or water-repelling agents
-
- 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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/64—Addition to the formed paper by contacting paper with a device carrying the material the material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened coating
-
- 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)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a method for producing fluorine-free oil-proof paper by a fourdrinier large cylinder film transfer paper machine, and belongs to the technical field of papermaking. The technical scheme comprises the following production process flows: pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing. The invention confirms that the paper machine with a fourdrinier vat film-adding transfer sizing machine can produce qualified fluorine-free oil-proof paper; the method adopts a large cylinder paper machine to produce, remarkably improves the smoothness and glossiness of the front surface of the oil-proof paper, and is beneficial to the definition and reality of the printed pattern; the high pulping and beating degree ensures the paper sheet sealing performance and the even coating of the surface sizing agent; the novel sizing process is completely free of fluoride, and meets the requirement of fluorine-free environment protection.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for producing fluorine-free oil-proof paper by a fourdrinier vat machine.
Background
Along with the continuous development of society and the continuous improvement of people's physical life, the application scene of oil-proof paper is also wider and wider, but the main problem that always puzzles the society is that fluorine is added more, and the food-grade oil-proof paper in the market at present all uses fluoride as oil-proof agent, and scientist researches prove that fluoride has carcinogenic effect to the health, so European and American countries have forbidden to use fluoride to produce food-grade oil-proof paper, need to develop an oil-proof paper which does not contain fluoride and meets the oil-proof requirement.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for producing the fluorine-free oil-proof paper by the fourdrinier vat machine overcomes the defects of the prior art, and uses a special surface sizing formula to produce the oil-proof paper which does not contain fluoride and meets the oil-proof requirement.
The technical scheme of the invention is as follows: a method for producing fluorine-free oil-proof paper by a fourdrinier vat machine comprises the following production process flows: pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: 50-60% of bleached sulfate softwood pulp and 40-50% of bleached sulfate hardwood pulp;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 60-65 degrees SR, and the wet weight is 2.5-3.5g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-papermaking tank;
(4) Adding a wet strength agent and AKD at the inlet of a pulp pump;
(5) Adding a cationic retention aid into a pipeline between the pulp pump and the pressure screen;
(6) Adding silica sol into a pipeline between a pressure screen and a head box;
(7) Applying a novel surface sizing agent by adopting a film transfer sizing machine; the novel surface sizing formula has a mass standard solid content of 7.5+/-0.5%, a viscosity of 80-120mpa.s and a temperature of 65-70 ℃, and the novel surface sizing agent is prepared from the following raw materials in parts by weight: 10+/-1 parts of food-grade oil-proof starch and 123+/-5 parts of clear water;
(8) Main parameters of paper machine operation
1) The speed of the vehicle is 300-350m/min,
2) The steam pressure of the big cylinder is 500-550kpa,
3) Control parameters of film transfer sizing machine
Gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: the reverse side is more than or equal to 2g/m 2 The front surface is more than or equal to 2g/m 2 ，
The paper forming dryness of the film feeding transfer sizing machine is more than or equal to 95 percent, and the paper forming dryness of the film discharging transfer sizing machine is more than or equal to 75 percent;
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
Preferably, the cationic starch is used in an amount of 10-15 kg/ton pulp.
Preferably, the AKD is used in an amount of 15-20 kg/ton pulp, the wet strength agent 20-25 kg/ton pulp.
Preferably, the cationic retention aid is used in an amount of 0.25-0.35kg per ton of pulp.
Preferably, the silica sol is used in an amount of 2.5-3.5 kg/ton of pulp.
Preferably, the novel surface glue is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 93-95 ℃, preserving heat for 18-20min, extracting the surface glue, cooling to 65-70 ℃ in a surface glue dilution tank, mixing with 2/3 of clear water to obtain a novel surface glue solution with 7.5% of solid content, and extracting the novel surface glue solution into a surface glue storage tank for standby.
The technical scheme of the invention can also be used for production by using an off-machine coating machine, and has the characteristics of high cost and low efficiency. The method can also be used for paper machine production of a fourdrinier multi-cylinder film-adding transfer sizing machine, and has the defects of low front smoothness and unclear later printing.
Compared with the prior art, the invention has the following beneficial effects:
1. it was confirmed that a paper machine equipped with a fourdrinier vat with a film transfer size press could produce acceptable fluorine-free oilproof paper.
2. The invention adopts a large cylinder paper machine to produce, obviously improves the smoothness and glossiness of the front surface of the oil-proof paper, and is beneficial to the definition and reality of the printed pattern.
3. Higher pulping and beating degree ensures the paper sheet sealing performance and the even coating of the surface sizing agent.
4. The novel sizing process is completely free of fluoride, and meets the requirement of fluorine-free environment protection.
Detailed Description
The raw materials adopted in the embodiment are all commercial raw materials except special descriptions, the oil-proof starch is GP ™ JT-3260 type food-grade oil-proof starch produced by Junde environmental protection technology, the oil-proof starch can replace a sizing system of the traditional common starch matched with a fluorine-containing oil-proof agent, the gelatinized oil-proof starch can be used for directly sizing the surface of base paper, and the oil-proof starch is simultaneously suitable for in-machine/out-machine sizing and coating, is simple to use and does not change the existing sizing technology. The product has no fluorine and silicon, excellent film forming and proper coating amount, and can reach the required oil-proof grade.
Example 1
The embodiment provides a method for producing fluorine-free oil-proof paper by a fourdrinier vat machine, which comprises the following production process flows:
pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: bleached sulfate softwood pulp 50% and bleached sulfate hardwood pulp 50%;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 60 DEG SR, and the wet weight is 3.5g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-pulping tank, wherein the dosage of the cationic starch is 10 kg/ton of pulp;
(4) Adding a wet strength agent and AKD at the inlet of a pulp flushing pump, wherein the dosage of AKD is 15 kg/ton pulp, and the dosage of the wet strength agent is 20 kg/ton pulp;
(5) Adding a cationic retention aid into a pipeline between a pulp flushing pump and a pressure screen, wherein the dosage of the cationic retention aid is 0.25 kg/ton of pulp;
(6) Adding silica sol into a pipeline between a pressure screen and a head box, wherein the dosage of the silica sol is 2.5 kg/ton of pulp;
(7) Applying a novel surface sizing agent by a sizing machine; the novel surface sizing formula has 7.5% of mass standard solid content and 80mpa.s of viscosity and 65 ℃, and the novel surface sizing agent comprises the following raw materials in parts by weight: 10 parts of food-grade oil-proof starch and 123 parts of clear water;
the novel surface adhesive is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, cooling to 65 ℃ in a surface glue dilution tank, mixing with 2/3 of clear water to obtain a novel surface sizing solution with 7.5% of solid content, and lifting to a surface glue storage tank for later use;
(8) Main parameters of paper machine operation
1) Vehicle speed 300m/min
2) Big cylinder steam pressure 500kpa
3) Control parameters of film transfer sizing machine
Gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: reverse side 2g/m 2 2g/m on the front face 2 ，
The paper forming dryness of the film feeding transfer sizing machine is 95%, and the paper forming dryness of the film discharging transfer sizing machine is 75%;
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
Example 2
The embodiment provides a method for producing fluorine-free oil-proof paper by a fourdrinier vat machine, which comprises the following production process flows:
pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: bleached sulfate softwood pulp 50% and bleached sulfate hardwood pulp 50%;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 65 DEG SR, and the wet weight is 3.0g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-pulping tank, wherein the dosage of the cationic starch is 15 kg/ton of pulp;
(4) Adding a wet strength agent and AKD at the inlet of a pulp flushing pump, wherein the dosage of AKD is 20 kg/ton pulp, and the dosage of the wet strength agent is 25 kg/ton pulp;
(5) Adding a cationic retention aid into a pipeline between a pulp flushing pump and a pressure screen, wherein the dosage of the cationic retention aid is 0.35 kg/ton of pulp;
(6) Adding silica sol into a pipeline between a pressure screen and a head box, wherein the dosage of the silica sol is 3.5 kg/ton of pulp;
(7) Applying a novel surface sizing agent by a sizing machine; the novel surface sizing formula has 7.5% of mass standard solid content and 120mpa.s of viscosity and 70 ℃, and the novel surface sizing agent comprises the following raw materials in parts by weight: 10 parts of food-grade oil-proof starch and 123 parts of clear water; the novel surface adhesive is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 95deg.C, maintaining the temperature for 20min, cooling to 70deg.C in a surface glue dilution tank, mixing with 2/3 of clear water to obtain novel surface sizing solution with 7.5% solid content, and extracting into a surface glue storage tank for use.
(8) Main parameters of paper machine operation
1) Vehicle speed 350m/min
2) Big cylinder steam pressure 550kpa
3) Control parameters of film transfer sizing machine
Gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: reverse side 2.1g/m 2 2.2 g/m front side 2 ，
The paper forming dryness of the film feeding transfer sizing machine is 96 percent, and the paper forming dryness of the film discharging transfer sizing machine is 80 percent
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
Comparative example 1
The comparative example provides a method for producing fluorine-free oil-proof paper by a fourdrinier vat machine, which comprises the following production process flows:
pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: bleached sulfate softwood pulp 50% and bleached sulfate hardwood pulp 50%;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 60 DEG SR, and the wet weight is 3.5g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-pulping tank, wherein the dosage of the cationic starch is 10 kg/ton of pulp;
(4) Adding a wet strength agent and AKD at the inlet of a pulp flushing pump, wherein the dosage of AKD is 15 kg/ton pulp, and the dosage of the wet strength agent is 20 kg/ton pulp;
(5) Adding a cationic retention aid into a pipeline between a pulp flushing pump and a pressure screen, wherein the dosage of the cationic retention aid is 0.25 kg/ton of pulp;
(6) Adding silica sol into a pipeline between a pressure screen and a head box, wherein the dosage of the silica sol is 2.5 kg/ton of pulp;
(7) Applying a novel surface sizing agent by a sizing machine; the novel surface sizing formula has 7.5% of mass standard solid content and 60mpa.s of viscosity at 65 ℃, and the novel surface sizing agent comprises the following raw materials in parts by weight: 5 parts of oxidized starch, 5 parts of oil-proofing agent and 120 parts of water.
The novel surface adhesive is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, cooling to 65 ℃ in a surface glue dilution tank, mixing with 2/3 of clear water to obtain a novel surface sizing solution with 7.5% of solid content, and lifting to a surface glue storage tank for later use;
(8) Main parameters of paper machine operation
1) Vehicle speed 300m/min
2) Big cylinder steam pressure 500kpa
3) Control parameters of film transfer sizing machine
Gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: reverse side 2g/m 2 2g/m on the front face 2 ，
The paper forming dryness of the film feeding transfer sizing machine is 95%, and the paper forming dryness of the film discharging transfer sizing machine is 75%;
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
Comparative example 2
The embodiment provides a method for producing fluorine-free oil-proof paper by using a fourdrinier multi-cylinder film transfer paper machine, which is different from the embodiment 1 in the form of the paper machine and comprises the following production process flow
Pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, cylinder assembly, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: bleached sulfate softwood pulp 50% and bleached sulfate hardwood pulp 50%;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 60 DEG SR, and the wet weight is 3.5g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-pulping tank, wherein the dosage of the cationic starch is 10 kg/ton of pulp;
(4) Adding a wet strength agent and AKD at the inlet of a pulp flushing pump, wherein the dosage of AKD is 15 kg/ton pulp, and the dosage of the wet strength agent is 20 kg/ton pulp;
(5) Adding a cationic retention aid into a pipeline between a pulp flushing pump and a pressure screen, wherein the dosage of the cationic retention aid is 0.25 kg/ton of pulp;
(6) Adding silica sol into a pipeline between a pressure screen and a head box, wherein the dosage of the silica sol is 2.5 kg/ton of pulp;
(7) Applying a novel surface sizing agent by a sizing machine; the novel surface sizing formula has 7.5% of mass standard solid content and 80mpa.s of viscosity and 65 ℃, and the novel surface sizing agent comprises the following raw materials in parts by weight: 10 parts of food-grade oil-proof starch and 123 parts of clear water;
the novel surface adhesive is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, cooling to 65 ℃ in a surface glue dilution tank, mixing with 2/3 of clear water to obtain a novel surface sizing solution with 7.5% of solid content, and lifting to a surface glue storage tank for later use;
(8) Main parameters of paper machine operation
1) Vehicle speed 300m/min
2) Big cylinder steam pressure 500kpa
3) Control parameters of film transfer sizing machine
Gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: reverse side 2g/m 2 2g/m on the front face 2 ，
The paper forming dryness of the film feeding transfer sizing machine is 95%, and the paper forming dryness of the film discharging transfer sizing machine is 75%;
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
The base papers prepared by the methods of examples 1-2 and comparative examples 1-2 were examined, and the examination results are shown in Table 1.
TABLE 1
From the detection data, the oil-proof grade can reach more than 6 by adopting the scheme of the invention, the glossiness is improved by 9% compared with that of the production of a fourdrinier multi-cylinder machine, and the smoothness is improved by about 90 s; from the data, the invention achieves the oil-proof grade of common oil-proof paper (generally requires more than 5), and meanwhile, the front smoothness is higher, which is difficult to achieve by a long-net multi-cylinder machine.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications and substitutions for embodiments of the invention may be made by those skilled in the art without departing from the spirit and scope of the invention, and these modifications and substitutions are intended to be within the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. The method for producing the fluorine-free oil-proof paper by the fourdrinier vat machine is characterized by comprising the following production process flows:
pulp board, chain plate conveying, pulp grinder, discharge tank, pulp grinder, pulp forming tank, pre-papermaking tank, pulp flushing pump, pressure screen, pulp flowing box, net part, press part, large cylinder, sizing machine, cylinder assembly, calender, coiling part, rewinding, packaging and warehousing;
wherein:
(1) The slurry ratio is as follows: 50-60% of bleached sulfate softwood pulp and 40-50% of bleached sulfate hardwood pulp;
(2) And (3) pulping: after the sizing agent is uniformly mixed according to the proportion, three DD720 double-disc mills are adopted for serial pulping, the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs, the beating degree is 60-65 degrees SR, and the wet weight is 2.5-3.5g;
(3) Adding cationic starch into a pipeline between a pulping tank and a pre-papermaking tank;
(4) Adding a wet strength agent and AKD at the inlet of a pulp pump;
(5) Adding a cationic retention aid into a pipeline between the pulp pump and the pressure screen;
(6) Adding silica sol into a pipeline between a pressure screen and a head box;
(7) Applying a novel surface sizing agent by adopting a film transfer sizing machine; the novel surface sizing formula has a mass standard solid content of 7.5+/-0.5%, a viscosity of 80-120mpa.s and a temperature of 65-70 ℃, and the novel surface sizing agent is prepared from the following raw materials in parts by weight: 10+/-1 parts of food-grade oil-proof starch and 123+/-5 parts of clear water;
(8) Main parameters of paper machine operation
1) The speed of the vehicle is 300-350m/min,
2) The steam pressure of the big cylinder is 500-550kpa,
3) The control parameters of the film transfer sizing machine,
gauge stick model and pressure
Front gauge bar V30, line pressure 20kN/m,
a reverse side measuring bar V30, a line pressure of 20kN/m,
novel surface glue paper pick-up amount: the reverse side is more than or equal to 2g/m 2 The front surface is more than or equal to 2g/m 2 ，
The paper forming dryness of the film feeding transfer sizing machine is more than or equal to 95 percent, and the paper forming dryness of the film discharging transfer sizing machine is more than or equal to 75 percent
4) The calender adopts a double-nip soft calender, the one-nip pressure is 80kN/m, and the temperature is 150 ℃; the two-pressure is 80kN/m, and the temperature is 120 ℃.
2. A method for producing fluorine-free oil-proof paper by a fourdrinier vat machine according to claim 1, wherein the cationic starch is used in an amount of 10-15 kg/ton pulp.
3. A method for producing fluorine-free oilproof paper by a fourdrinier vat machine according to claim 1, wherein the AKD is used in an amount of 15-20 kg/ton pulp and the wet strength agent is 20-25 kg/ton pulp.
4. A method for producing fluorine-free oil-repellent paper by a fourdrinier vat machine according to claim 1, wherein the cationic retention aid is used in an amount of 0.25-0.35 kg/ton pulp.
5. A method for producing fluorine-free oil-proof paper by a fourdrinier vat machine according to claim 1, wherein the silica sol is used in an amount of 2.5-3.5 kg/ton pulp.
6. The method for producing fluorine-free oil-proof paper by using a fourdrinier vat machine according to claim 1, wherein the novel surface glue is prepared by the following method: adding 1/3 of clear water into food-grade oil-proof starch, stirring uniformly in a surface glue steaming and boiling tank, introducing steam, heating to 93-95 ℃, preserving heat for 18-20min, extracting the surface glue, cooling to 65-70 ℃, mixing with 2/3 of clear water to obtain a novel surface glue solution with 7.5% of solid content, and extracting the novel surface glue solution into a surface glue storage barrel for standby.
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|---|---|---|---|
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