CN113403875A - Papermaking curtain type coating - Google Patents
Papermaking curtain type coating Download PDFInfo
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- CN113403875A CN113403875A CN202110618846.1A CN202110618846A CN113403875A CN 113403875 A CN113403875 A CN 113403875A CN 202110618846 A CN202110618846 A CN 202110618846A CN 113403875 A CN113403875 A CN 113403875A
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- coating
- curtain
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- calcium carbonate
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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
- 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
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H17/64—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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- 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
-
- 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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The invention relates to a paper curtain type coating paint, which is characterized by comprising heavy calcium carbonate, light calcium carbonate and an acrylate dispersant; the raw material water of the coating adopts softened water. The improvement of the formula reduces the generation of air foam in the coating, reduces micro flocculation and sedimentation of the coating after standing, reduces the conditions of coating leakage and curtain breaking, prolongs the running period of a curtain coating system and improves the curtain coating efficiency.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a curtain type coating for papermaking.
Background
With the development of coating papermaking technology, blade coating currently occupies a mainstream position, but with the blade coating under the condition of high solid content coating, runnability problems such as scratch, paper break, blade abrasion and the like are easy to occur, and with the more and more intense competition, how to reduce the coating amount, improve the covering performance of the coating and reduce the chemical cost of the coating is the goal pursued by coating papermaking trades, and under the situation, the advantages of high covering performance, no scratch and high vehicle speed applicability of curtain coating draw attention to the trades. Curtain coating, an emerging coating technique, has begun to gain increasing attention and acceptance. Curtain coating has many advantages, such as coating coverage is good, the requirement on base paper strength is small, the advantages of uniform banner coating weight, high coating speed, obvious covering effect compared with other coating modes such as a scraper under the same coating weight, obvious chemical cost for saving coating, low operation cost and the like are achieved. In curtain coating, the coating material flows out of a slit die of a die nozzle of a curtain coating head at a certain initial speed under a certain pressure to form a stable and continuous curtain free fall, and the curtain free fall is impacted on a paper web running at a high speed at a certain speed, and then the curtain extension speed covers the paper surface at an extension speed of more than 5 times of 10 within 0.1 second to finish coating. However, the system has high requirement on clean environment in operation, the coating running in the feeding system is easy to generate micro flocculation and sedimentation after a long standing time to cause coating leakage and curtain breaking, and the curtain coating system needs to be cleaned frequently, so that the curtain coating system has the phenomena of short running time and low efficiency.
In the prior art, the coating is prepared from the following components in parts by mass: 100 mass portions of softened water, 70.0 to 80.0 mass portions of 95-grade calcium carbonate, 6.0 to 10.0 mass portions of No. 1 kaolin, 0.1 to 0.3 mass portion of alkaline water, 18.0 to 23.0 mass portions of calcined soil, 0.3 to 1.0 mass portion of water retention agent, 0.3 to 1.0 mass portion of polyvinyl alcohol, 1.2 to 6.0 mass portions of curtain stabilizing latex, 5.0 to 11.0 mass portions of ductility latex, 0.01 to 0.02 mass portion of bactericide and 0.02 to 0.05 mass portion of thickening agent. At present, the curtain coating system has a running period of 5-7 days, and is cleaned 5 times per month on average, and each cleaning time needs about 3 hours.
Disclosure of Invention
Therefore, the invention provides a novel papermaking curtain type coating paint which can reduce micro flocculation and sedimentation after the paint is static, reduce the conditions of missing coating and curtain breaking, prolong the running period of a curtain coating system and improve the curtain coating efficiency.
The inventor provides a paper curtain coating paint, which comprises heavy calcium carbonate, light calcium carbonate and acrylate dispersant; the raw material water of the coating adopts softened water.
By using light calcium carbonate with large sedimentation volume and small bulk density (light calcium sedimentation volume is 2.4-2.8ml/g, and bulk density is 0.5-0.7 g/cm)3) To replace part of heavy calcium carbonate with small sedimentation volume and large bulk density (the sedimentation volume of the heavy calcium is 1.1-1.4ml/g, the bulk density is 0.8-1.3 cm)3) The curtain coating sedimentation phenomenon can be reduced, and the curtain coating paint of light calcium can prevent the paint retained in the curtain coating vacuum degassing tank and the curtain coating head spraying cavity from generating sedimentation prematurely and reducing coating leakage in the system operation process, thereby prolonging the system operation time and improving the operation efficiency.
In the research, the specific gravity of the curtain coating is reduced from 1.53 to 1.48 under the condition that the same solid content concentration (for example, 61 percent solid content) is ensured by the coating after the light calcium is used, and the falling curtain stability of the curtain coating is improved by the reduction of the specific gravity of the coating.
Meanwhile, the reduction of the use of the heavy calcium carbonate achieves the reduction of the entrainment of accompanying mineral impurities. The heavy calcium carbonate is obtained by mechanical continuous grinding and crushing through a physical method, so that the particle size of the heavy calcium carbonate is small enough, no matter how small the particle size is, the accompanying mineral impurities are always together, in the prepared coating, the accompanying mineral impurities with the heavy calcium exist together in the operation of a coating system, and the impurities are separated out and flocculated to cause coating leakage in the circulation of continuous vacuum degassing, pumping and static mixing of the coating along with the extension of the curtain coating operation time. The light calcium is prepared by removing impurities through limestone calcination, adding water to dissolve the light calcium, and then performing carbonization and precipitation, and the light calcium has the characteristics of high purity and less impurity content, and can reduce the phenomenon that the coating is retained in a system for a long time and the accumulation of the impurities is relatively less when the light calcium is used in a curtain coating process, thereby prolonging the curtain coating operation period. And the light calcium carbonate can also be mixed light and heavy calcium carbonate with different fineness, so that the base paper can be better combined, the covering performance of a coating layer is improved, the ink absorption measurement of the surface of finished paper after cloth is finished is improved, and meanwhile, the smoothness and whiteness of the finished paper are also improved, and the printing suitability is improved.
In the curtain coating process, the content of calcium and magnesium in common clear water for preparing the coating is high, soap scum is easily formed after the relative time of the system operation period of the coating is long due to the fact that water with high hardness contains more calcium and magnesium ions, in the alkaline coating, the content of calcium and magnesium ions is high, meanwhile, fine impurities contained in the water are difficult to filter and remove, the fine impurities can be slowly flocculated, accumulated, adsorbed and bonded on the wall of a barrel of a remover tank and the wall of a spray cavity of a curtain coating head under the action of the soap scum and an adhesive and under the comprehensive action of other pigment fine impurities and metal ions, the fine impurities are dragged and shed out along with flowing coating after being accumulated to a certain amount, and finally, a guide rod effect is accumulated at a spray cavity opening to form a guide rod effect, so that coating leakage and curtain breakage are caused, and the operation period is shortened due to early cleaning.
The invention changes the curtain coating process into softened water (0-60ppm), reduces the generation of foam in the process of preparing and feeding the coating, reduces the content of calcium and magnesium ions and the introduction of other impurities in water, reduces the combination and flocculation of the impurities and other metal ions in the alkaline coating in the system operation of the coating, reduces the formation of soap scum and desquamation on the wall of a metal container, and achieves the purposes of prolonging the system operation time and improving the operation efficiency.
In the prior art, curtain coating paint prepared by hard water can generate more foams under the alkaline condition, thus causing the hydrochloric acid insoluble substances (calcium carbonate, kaolin, calcined soil, light calcium and the like which are contained in the paint after being dispersed at high speed in the material preparation process) in the paint and the calcium and magnesium soluble substances in the hard water to flocculate and flocculate, and finally causing missing coating at a curtain coating seam nozzle, thereby influencing the curtain coating operation)
When the curtain coating paint is used and operated, part of the paint entering the system early is circulated in the system and is accumulated in the system, the charge decay among the pigment particles of the paint staying in the system is weakened along with the continuation of the operation time, so that the sedimentation and flocculation are caused, in order to prolong the charge balance among the pigment particles of the paint entering the system early and staying in the system, so that the serious flocculation and sedimentation are not caused too early, in the curtain coating material preparing process, the acrylate dispersant is added to provide a sufficient anionic charge layer around the surface of the pigment, so that more charge repulsion is formed among the pigment particles, the paint staying in the system is not flocculated and sedimented too early, and is kept in a stable particle space repulsion equilibrium state for a longer time under a static state, thereby achieving a more stable suspension paint concentrated solution.
Preferably, the coating comprises the following components in parts by mass: 100 parts of softened water, 350 parts of 95-grade calcium carbonate, 56.0-70.0 parts of light calcium carbonate, 4.0-14.0 parts of 1# kaolin, 0.05-0.1 part of acrylate dispersant, 0.1-0.3 part of alkaline water, 0.3-1.0 part of water retention agent, 0.3-1.0 part of polyvinyl alcohol, 6.2-17 parts of adhesive and 0.02-0.05 part of thickening agent.
Preferably, the adhesive comprises curtain stabilizing latex and ductility latex, and the mass ratio of the curtain stabilizing latex to the ductility latex is 1.2-6.0: 5.0-11.0.
Preferably, the pH value of the alkaline water is 8.5-9.5.
Preferably, the coating also comprises 0.01-0.02 mass part of bactericide.
Preferably, the coating also comprises 15.0 to 20.0 parts by mass of calcined soil.
Preferably, the precipitated volume of the light calcium carbonate is 2.4 to 2.8ml/g, and the bulk density is 0.5 to 0.7g/cm3。
Preferably, the heavy calcium carbonate has a sedimentation volume of 1.1 to 1.4ml/g and a bulk density of 0.8 to 1.3g/cm3。
Preferably, the coating has a pH of 8.7 to 9.1.
Different from the prior art, the technical scheme provides that the paint formula comprises heavy calcium carbonate and light calcium carbonate, and raw material water adopts softened water; the production of air foam in the coating is reduced, micro flocculation and sedimentation after the coating is static are reduced, the conditions of coating leakage and curtain breaking are reduced, the running period of a curtain coating system is prolonged, and the curtain coating efficiency is improved.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
In the present embodiment, the acrylate dispersant purchasing manufacturer is a Shandong Ossis actual Co., Ltd, model number: KCC-4388; the water-retaining agent purchasing manufacturer is Hengda chemical industry Co., Ltd, model: NX-10A; curtain-stabilizing latex, purchased from the manufacturer shengxi ao polymer (zhangjia) limited, model: 4018; ductile latex, purchased from the manufacturer shengxi ao polymers (zhangjia) limited, model: 4118; germicides, purchased from nalco chemical, usa, model N7647; the thickener was purchased from the manufacturer, kaimen fine chemical company, model: TPC-38.
EXAMPLE 1 curtain coating for papermaking
The papermaking curtain type coating is prepared from the following components in parts by mass: 350 parts of softened water, 56.0 parts of 95-grade calcium carbonate, 4.0 parts of light calcium carbonate, 6.0 parts of No. 1 kaolin, 0.05 part of acrylate dispersant, 0.1 part of alkaline water (the pH value is 8.5), 15.0 parts of calcined soil, 0.3 part of water retention agent, 0.3 part of polyvinyl alcohol, 1.2 parts of curtain stabilizing latex, 11.0 parts of ductility latex, 0.01 part of bactericide and 0.02 part of thickening agent.
The paper curtain coating prepared in example 1 has a ph of 8.7-9.1 and a solids content of 59% -61%.
EXAMPLE 2 curtain coating for papermaking
The coating is prepared from the following components in parts by mass: 100 parts of softened water, 350 parts by mass, 70.0 parts by mass of 95-grade calcium carbonate, 14.0 parts by mass of light calcium carbonate, 10.0 parts by mass of No. 1 kaolin, 0.1 part by mass of acrylate dispersant, 0.3 part by mass of alkaline water (pH value is 9.5), 20.0 parts by mass of calcined soil, 1.0 part by mass of water-retaining agent, 1.0 part by mass of polyvinyl alcohol, 6.0 parts by mass of curtain stabilizing latex, 5.0 parts by mass of ductility latex, 0.02 part by mass of bactericide and 0.05 part by mass of thickener.
The paper curtain coating prepared in example 2 has a ph of 8.7-9.1 and a solids content of 59% -61%.
EXAMPLE 3 curtain coating for papermaking
The coating is prepared from the following components in parts by mass: 100 parts of softened water, 350 parts by mass, 65.0 parts by mass of 95-grade calcium carbonate, 10.0 parts by mass of light calcium carbonate, 8.0 parts by mass of No. 1 kaolin, 0.08 part by mass of acrylate dispersant, 0.2 part by mass of alkaline water (pH value is 9.0), 18 parts by mass of calcined soil, 0.7 part by mass of water-retaining agent, 0.6 part by mass of polyvinyl alcohol, 4.0 parts by mass of curtain stabilizing latex, 8.0 parts by mass of ductility latex, 0.02 part by mass of bactericide and 0.03 part by mass of thickener.
The paper curtain coating prepared in example 3 had a ph of 8.7-9.1 and a solids content of 59% -61%.
The papermaking curtain coating prepared in the embodiment prolongs the curtain coating operation period and reduces the system cleaning times in the practical use of curtain coating, and the operation efficiency is improved by more than 60 percent from the prior art that the coating is cleaned 5 times per month to 3 times per month. Meanwhile, the product degradation amount caused by curtain coating omission and curtain breaking is reduced, the degradation amount per month is reduced by more than 30 tons, and the product degradation amount per year is reduced by more than 360 tons; and the product quality is improved, and the surface of the finished paper is smoother. The times of cleaning the curtain coating off the coating head and the system are reduced, about 3 hours are needed for each cleaning, the unnecessary cleaning time can reach 240 hours in the annual period, 7500 tons of paper can be produced each year, 360 tons of degraded products are reduced, and the comprehensive economic benefit is more than 500 ten thousand yuan.
Curtain coating in system operation, in order to form a uniform and stable curtain covering paper surface when a spray cavity die nozzle falls on the curtain, the coating is required to have good ductility and stability, meanwhile, air foam is not required to be contained, but in the preparation and mixing processes of the coating, the pigments, the additives and the adhesive need to be stirred to ensure that the pigments, the additives and the adhesive are fully and uniformly mixed, in the process, air is inevitably brought into the coating, and meanwhile, the adhesive emulsion in the coating is synthesized and modified to improve the extensibility and stability of the adhesive emulsion, the curtain coating prepared by the method has good coating strength, the curtain has good ductility and stability, the curtain is prevented from being missed to be coated, the curtain is prevented from being broken by a high-speed running range after falling on a paper surface, and the surface of each chemical auxiliary agent has chemical activity and contains air foam. In use, in order to eliminate air bubbles in the coating, the curtain coating needs to be pumped into a vacuum degassing tank for vacuum degassing, except for the condition that the coating in a pumping pipeline is in a flowing state, the flow rate of the coating at other parts is relatively slow, the coating in the vacuum degassing tank, the coating in a feeding station and a spraying cavity is slow to be equivalent to a static state, so that the charge among particles is weakened after the coating in the vacuum degassing tank, the coating in the feeding station and the curtain coating spraying cavity is in a system for a long time, the pigment particles are flocculated, the pigment particles are easy to settle under the action of gravity and equipment vibration, and the newly supplied coating can bring the coating with the weakened charge among the particles, flocculated and poor settling stability into the spraying cavity under the pumping action of pumping of the coating pumped into the degassing tank and the feeding station due to the laminar flow, pulling and mixing of the liquid. When the prior art runs for a period of 5-7 days, the particle groups with weakened charges, flocculated and settled can gradually increase the leakage coating and curtain breaking when the lifting curtain is introduced, and the system needs to be discharged and cleaned when the situation occurs.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (9)
1. The papermaking curtain type coating is characterized by comprising heavy calcium carbonate, light calcium carbonate and an acrylate dispersant; the raw material water of the coating adopts softened water.
2. The coating according to claim 1, characterized in that the coating comprises the following components in parts by mass: 100 parts of softened water, 350 parts of 95-grade calcium carbonate, 4.0-14.0 parts of light calcium carbonate, 6.0-10.0 parts of No. 1 kaolin, 0.05-0.1 part of acrylate dispersant, 0.1-0.3 part of alkaline water, 0.3-1.0 part of water retention agent, 0.3-1.0 part of polyvinyl alcohol, 6.2-17.0 parts of adhesive and 0.02-0.05 part of thickening agent.
3. The coating of claim 2, wherein the adhesive comprises curtain stabilizer latex and ductility latex, and the mass ratio of the curtain stabilizer latex to the ductility latex is 1.2-6.0: 5.0-11.0.
4. The coating of claim 2, wherein the alkaline water has a pH of 8.5 to 9.5.
5. The paint according to claim 2, characterized in that the paint further comprises 0.01-0.02 parts by mass of a bactericide.
6. The coating material according to claim 2, wherein the coating material further comprises calcined clay 15.0 to 20.0 parts by mass.
7. The coating according to claim 1, wherein the precipitated volume of the precipitated calcium carbonate is 2.4 to 2.8ml/g and the bulk density is 0.5 to 0.7g/cm3。
8. The coating according to claim 1, wherein the ground calcium carbonate has a sediment volume of 1.1 to 1.4ml/g and a bulk density of 0.8 to 1.3g/cm3。
9. The coating of claim 1, wherein the coating has a pH of 8.7 to 9.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110618846.1A CN113403875A (en) | 2021-06-03 | 2021-06-03 | Papermaking curtain type coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110618846.1A CN113403875A (en) | 2021-06-03 | 2021-06-03 | Papermaking curtain type coating |
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| Publication Number | Publication Date |
|---|---|
| CN113403875A true CN113403875A (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110618846.1A Pending CN113403875A (en) | 2021-06-03 | 2021-06-03 | Papermaking curtain type coating |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006111980A (en) * | 2004-10-12 | 2006-04-27 | Nippon Zeon Co Ltd | Coating composition and coated paper |
| JP2006193418A (en) * | 2004-12-16 | 2006-07-27 | San Nopco Ltd | Method for manufacturing heavy calcium carbonate slurry |
| US20170072727A1 (en) * | 2014-05-26 | 2017-03-16 | Omya International Ag | Calcium carbonate for rotogravure printing medium |
| CN111335061A (en) * | 2020-04-09 | 2020-06-26 | 联盛纸业（龙海）有限公司 | Coated white paperboard and preparation method thereof |
| CN112127205A (en) * | 2020-09-24 | 2020-12-25 | 联盛纸业（龙海）有限公司 | Curtain coating paint and application thereof |
-
2021
- 2021-06-03 CN CN202110618846.1A patent/CN113403875A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006111980A (en) * | 2004-10-12 | 2006-04-27 | Nippon Zeon Co Ltd | Coating composition and coated paper |
| JP2006193418A (en) * | 2004-12-16 | 2006-07-27 | San Nopco Ltd | Method for manufacturing heavy calcium carbonate slurry |
| US20170072727A1 (en) * | 2014-05-26 | 2017-03-16 | Omya International Ag | Calcium carbonate for rotogravure printing medium |
| CN111335061A (en) * | 2020-04-09 | 2020-06-26 | 联盛纸业（龙海）有限公司 | Coated white paperboard and preparation method thereof |
| CN112127205A (en) * | 2020-09-24 | 2020-12-25 | 联盛纸业（龙海）有限公司 | Curtain coating paint and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 杨光乾等: "《锅炉司机》", 31 January 2009, 中国矿业大学出版社, pages: 115 * |
| 陆柱等: "《水处理技术》", 31 August 2006, 华东理工大学出版社, pages: 152 * |
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