CN113756134A - Printing paper and preparation method thereof - Google Patents
Printing paper and preparation method thereof Download PDFInfo
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- CN113756134A CN113756134A CN202111107628.8A CN202111107628A CN113756134A CN 113756134 A CN113756134 A CN 113756134A CN 202111107628 A CN202111107628 A CN 202111107628A CN 113756134 A CN113756134 A CN 113756134A
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- pulp
- bleached
- printing paper
- mixed
- sizing
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- 238000007639 printing Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000004513 sizing Methods 0.000 claims abstract description 38
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 24
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000011121 hardwood Substances 0.000 claims abstract description 16
- 239000011122 softwood Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000003490 calendering Methods 0.000 claims abstract description 7
- 239000000123 paper Substances 0.000 claims description 48
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 26
- 238000012216 screening Methods 0.000 claims description 16
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims description 12
- 244000082946 Tarchonanthus camphoratus Species 0.000 claims description 12
- 235000005701 Tarchonanthus camphoratus Nutrition 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000002655 kraft paper Substances 0.000 claims description 8
- 238000007872 degassing Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004537 pulping Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 244000166124 Eucalyptus globulus Species 0.000 claims 2
- 239000000546 pharmaceutical excipient Substances 0.000 claims 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims 1
- 230000002087 whitening effect Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 208000001491 myopia Diseases 0.000 abstract description 3
- 230000004379 myopia Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 24
- 229910000019 calcium carbonate Inorganic materials 0.000 description 13
- 239000002023 wood Substances 0.000 description 12
- 241000219927 Eucalyptus Species 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 238000009897 hydrogen peroxide bleaching Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- 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
- 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
- D21H17/63—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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The application discloses a preparation method of printing paper, which comprises the following steps: mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide bleached chemi-mechanical pulp to obtain mixed pulp; adding auxiliary materials into the mixed pulp and uniformly mixing; and (3) making the mixed pulp with uniformly mixed auxiliary materials, squeezing, performing primary drying, sizing, performing secondary drying, calendaring and curling to obtain the printing paper. The application also provides a printing paper. The application provides printing paper and a preparation method thereof, the printing paper has high opacity, smoothness and fine hand feeling, simultaneously, a fluorescent whitening substance is not used to change the hue of the product, the product presents natural color, meets the GB 40070-2021 myopia prevention and control sanitary requirement of children teenagers study articles, and is environment-friendly and healthy.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to printing paper and a preparation method thereof.
Background
With the continuous improvement of the material living standard of people in China, the individual demand level is also improved, and the requirement of spiritual satisfaction brought to individuals by culture and books is higher and higher. Readers have higher pursuits on the text content, the appearance of printed books and the overall presentation quality after printing, the printing quality is required to be too hard, the page hand feeling is comfortable, and whether the printed matter is environment-friendly or not is also emphasized.
The quality of the printed matter is closely related to the printing paper. Therefore, how to provide a printing paper to satisfy the requirements of printing, feeling and the like is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the above technical problems, a first object of the present invention is to provide a method for producing printing paper; the second purpose of the invention is to provide a printing paper prepared by the preparation method; the application provides printing paper and a preparation method thereof, the printing paper has high opacity, smoothness and fine hand feeling, simultaneously, a fluorescent whitening substance is not used to change the hue of the product, the product presents natural color, meets the GB 40070-2021 myopia prevention and control sanitary requirement of children teenagers study articles, and is environment-friendly and healthy.
The technical scheme provided by the invention is as follows:
a preparation method of printing paper comprises the following steps:
mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide bleached chemi-mechanical pulp to obtain mixed pulp;
adding auxiliary materials into the mixed pulp and uniformly mixing;
and (3) making the mixed pulp with uniformly mixed auxiliary materials, squeezing, performing primary drying, sizing, performing secondary drying, calendaring and curling to obtain the printing paper.
Preferably, the alkaline hydrogen peroxide bleaching chemimechanical pulp is prepared by pulping the mixture of camphor wood, broad miscellaneous wood and eucalyptus wood, wherein the camphor wood accounts for 10-15%, the broad miscellaneous wood accounts for 15-30%, the eucalyptus wood accounts for 60-70% and the sum is 100% by weight.
Preferably, the alkaline hydrogen peroxide bleached chemi-mechanical pulp has a pulp freeness of 280-320 ml and a fiber bundle content of less than 0.4%.
Preferably, the bleached sulfate softwood pulp, the bleached sulfate hardwood pulp and the alkaline hydrogen peroxide bleached chemi-mechanical pulp comprise the following components in parts by weight: 10-15% of bleached sulfate softwood pulp, 65-75% of bleached sulfate hardwood pulp and 15-20% of alkaline hydrogen peroxide bleached chemi-mechanical pulp, wherein the sum is 100%.
Preferably, the auxiliary material is light calcium carbonate.
Preferably, the papermaking specifically comprises: screening the mixed pulp uniformly mixed with the auxiliary materials, washing the pulp, desanding and degassing, sizing, fine screening, and molding and dehydrating on a net; wherein, the screen gap is 0.15-0.17mm when thick pulp is screened.
Preferably, the sheet basis weight before sizing is 70g/m2When the amount of the sizing agent is 3.2 +/-0.2 g/m2(ii) a The basis weight of the paper sheet before sizing is 80g/m2When the amount of the sizing agent is 3.6 +/-0.2 g/m2。
Preferably, the bleached sulfate softwood pulp is south America bleached sulfate softwood pulp; the bleached sulfate hardwood pulp is south American bleached sulfate hardwood commodity pulp board.
A printing paper produced by the production method described in any one of the above.
Preferably, the ISO brightness of the printing paper is less than 85%.
Aiming at the problems in the prior art, the application provides a preparation method of printing paper, the produced printing paper has higher opacity, smoothness and fine hand feeling, meanwhile, the paper keeps natural white color tone, and has higher printing color reducibility; meanwhile, the printing paper produced by the method does not use a fluorescent whitening substance to change the hue of the product, the product presents natural color, the finished paper has ISO whiteness within 85 percent, and the printing paper is a green printing product which has wide market prospect, printing color reducibility and high product presentation quality and meets GB 40070-2021 myopia prevention and control sanitary requirements of children teenagers study products, and is environment-friendly and healthy.
Specifically, the alkaline hydrogen peroxide bleached chemi-mechanical pulp (APMP pulp) used in this application uses eucalyptus and camphorwood as 70-85% of the raw materials. The eucalyptus wood and the camphor wood have deeper wood chips, can effectively improve the opacity of the APMP pulp, have larger contribution to the opacity of paper, and meet the requirements of high-grade printing products by combining the strict control of the use of fillers and the glue application of the produced factor paper.
The alkaline hydrogen peroxide bleaching chemi-mechanical pulp has ideal whitening effect, and has the advantages of high added value, good whiteness stability, high paper pulp yield and no generation of harmful by-products in the whitening process. The alkaline hydrogen peroxide bleached chemi-mechanical pulp is preferably self-produced, but the content of fiber bundles is high, the curled paper can feel obvious beating problems, and the smoothness and the hand feeling are not good. In order to solve the problem, the method starts with the refining quality and thick pulp screening, reduces the refining freeness of alkaline hydrogen peroxide bleaching chemical mechanical pulp to 252-312ml, reduces the fiber bundle content from 0.5% to within 0.4%, and obviously reduces the content of the fiber bundles; meanwhile, the screen gap is changed from 0.25mm to 0.15-0.17mm during thick slurry screening, so that the problem of paper surface curling is solved.
In order to ensure high opacity, smoothness and fine hand feeling of the high-grade printing paper product, the comprehensive consideration needs to be carried out on the dosage of alkaline hydrogen peroxide bleaching chemi-mechanical pulp, the application of filler and the control of sizing. Specifically, the paper weight is 70g/m according to the paper weight before sizing2The glue application amount is 3.2 +/-0.2 g/m2Paper basis weight of 80g/m2The glue application amount is 3.6 +/-0.2 g/m2Control to balance opacity and fine hand feel; in addition, the filler is changed into light calcium carbonate, which is helpful for calendering to improve smoothness and simultaneously give consideration to the influence on opacity.
Wherein, the preferable standard requirements of the light calcium carbonate are as follows:
| index item | Standard requirements |
| CaCO3Content (wt.) | ≥98％ |
| Screenings (325 mesh) | ≤0.2％ |
| pH value | 8.0-9.5 |
| Whiteness degree | ≥93％ISO |
| Particle size (D50) | 2.8-3.0um |
| Abrasion value | ≤25mg |
| Solid content | 18-20％ |
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
Example 1
The eucalyptus, camphorwood and broad miscellaneous wood raw materials are prepared into alkaline hydrogen peroxide bleaching chemimechanical pulp (APMP pulp) with ISO whiteness of 73 percent by preparing raw materials, wherein the raw materials adopt 15 percent of camphorwood, 15 percent of broad miscellaneous wood and 70 percent of eucalyptus (by weight). The APMP slurry freeness was 252 ml.
The slurry proportion is as follows: south american bleached kraft softwood pulp sheets (NBKP), south american bleached kraft hardwood pulp sheets (LBKP), and APMP pulp. The weight ratio of the sizing agent is as follows: NBKP 15%; LBKP 65%; and 20% of APMP slurry.
Uniformly mixing the NBKP slurry, the LBKP slurry and the APMP slurry, preparing a mixed slurry after mixing, and preparing the slurry into a concentration of 3.2%; adding light calcium carbonate, wherein the using amount of the light calcium carbonate is 21 percent of the weight ratio of the oven-dried pulp, and uniformly mixing;
screening the mixed pulp uniformly mixed with the light calcium carbonate by thick pulp, flushing pulp, desanding and degassing, sizing, fine screening, net surfing molding and dewatering, squeezing, primary drying, surface sizing, secondary drying, calendaring, reeling and packaging to prepare green high-grade printing paper; wherein the screen gap for screening the thick slurry is 0.15 mm; the sizing amount is 70g/m of the basis weight of the paper before sizing2When the amount of the sizing agent is 3.2g/m2(ii) a The basis weight of the paper sheet before sizing is 80g/m2When the amount of the sizing agent is 3.6g/m2. The paper for printing prepared in example 1 was tested to have a whiteness of 84.3%.
Example 2
The eucalyptus, camphorwood and broad miscellaneous wood raw materials are prepared into alkaline hydrogen peroxide bleaching chemimechanical pulp (APMP pulp) with ISO whiteness of 73 percent by preparing raw materials, wherein the raw materials adopt 12 percent of camphorwood, 23 percent of broad miscellaneous wood and 65 percent of eucalyptus (by weight). The APMP slurry freeness was 275 ml.
The slurry proportion is as follows: south american bleached kraft softwood pulp sheets (NBKP), south american bleached kraft hardwood pulp sheets (LBKP), and APMP pulp. The weight ratio of the sizing agent is as follows: NBKP 13%; LBKP 69%; APMP slurry 18%.
Uniformly mixing the NBKP slurry, the LBKP slurry and the APMP slurry, preparing a mixed slurry after mixing, and mixing the slurry to a concentration of 3.1%; adding light calcium carbonate, wherein the using amount of the light calcium carbonate is 22 percent of the weight ratio of the oven dry pulp, and uniformly mixing;
screening the mixed pulp uniformly mixed with the light calcium carbonate by thick pulp, flushing pulp, desanding and degassing, sizing, fine screening, net surfing molding and dewatering, squeezing, primary drying, surface sizing, secondary drying, calendaring, reeling and packaging to prepare green high-grade printing paper; wherein the screen gap for screening the thick slurry is 0.20 mm; the sizing amount is 70g/m of the basis weight of the paper before sizing2When the amount of the sizing agent is 3.4g/m2(ii) a The basis weight of the paper sheet before sizing is 80g/m2When the amount of the sizing agent is 3.8g/m2。
The whiteness of the printing paper prepared in example 2 was determined to be 84.3%.
Example 3
The eucalyptus, camphorwood and broad miscellaneous wood raw materials are prepared into alkaline hydrogen peroxide bleaching chemimechanical pulp (APMP pulp) with ISO whiteness of 73 percent by preparing raw materials, wherein the raw materials adopt 10 percent of camphorwood, 30 percent of broad miscellaneous wood and 60 percent of eucalyptus (by weight). The APMP pulp freeness was 280 ml.
The slurry proportion is as follows: south american bleached kraft softwood pulp sheets (NBKP), south american bleached kraft hardwood pulp sheets (LBKP), and APMP pulp. The weight ratio of the sizing agent is as follows: NBKP 12%; LBKP 73%; 15% of APMP slurry.
Uniformly mixing the NBKP slurry, the LBKP slurry and the APMP slurry, preparing a mixed slurry after mixing, and mixing the slurry to a concentration of 3.0%; adding light calcium carbonate, wherein the using amount of the light calcium carbonate is 23 percent of the weight ratio of the oven dry pulp, and uniformly mixing;
screening the mixed pulp uniformly mixed with the light calcium carbonate by thick pulp, flushing pulp, desanding and degassing, sizing, fine screening, net surfing molding and dewatering, squeezing, primary drying, surface sizing, secondary drying, calendaring, reeling and packaging to prepare green high-grade printing paper; wherein the screen gap for screening the thick slurry is 0.25 mm; the sizing amount is 70g/m of the basis weight of the paper before sizing2When the amount of the sizing agent is 3.0g/m2(ii) a The basis weight of the paper sheet before sizing is 80g/m2When the amount of the sizing agent is 3.4g/m2。
The whiteness of the printing paper prepared in example 3 was determined to be 84.6%.
The printing papers prepared in examples 1-3 have no fluorescent whitening agent, have whiteness within 85%, and can meet the requirement of eye protection effect. The printing papers prepared in examples 1 to 3 were used for color printing, and the results of the printing comparison were observed with the naked eye, and the color reproducibility was good.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of printing paper is characterized by comprising the following steps:
mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide bleached chemi-mechanical pulp to obtain mixed pulp;
adding auxiliary materials into the mixed pulp and uniformly mixing;
and (3) making the mixed pulp with uniformly mixed auxiliary materials, squeezing, performing primary drying, sizing, performing secondary drying, calendaring and curling to obtain the printing paper.
2. The method according to claim 1, wherein the alkaline hydrogen peroxide bleached chemi-mechanical pulp is prepared by pulping a mixture of camphorwood, hardwood, and eucalyptus, wherein the camphorwood is 10-15%, hardwood is 15-30%, eucalyptus is 60-70%, and the sum is 100% by weight.
3. The method according to claim 2, wherein the alkaline hydrogen peroxide bleached chemi-mechanical pulp has a pulp freeness of 280ml to 320ml and a fiber bundle content of less than 0.4%.
4. The method for preparing the wood pulp according to any one of claims 1 to 3, wherein the bleached sulfate softwood pulp, the bleached sulfate hardwood pulp and the alkaline hydrogen peroxide bleached chemi-mechanical pulp comprise the following components in parts by weight: 10-15% of bleached sulfate softwood pulp, 65-75% of bleached sulfate hardwood pulp and 15-20% of alkaline hydrogen peroxide bleached chemi-mechanical pulp, wherein the sum is 100%.
5. The method according to claim 1, wherein the excipient is precipitated calcium carbonate.
6. The production method according to any one of claims 1 to 3 and 5, wherein the paper making is specifically: screening the mixed pulp uniformly mixed with the auxiliary materials, washing the pulp, desanding and degassing, sizing, fine screening, and molding and dehydrating on a net; wherein, the screen gap is 0.15-0.17mm when thick pulp is screened.
7. The method of claim 1, wherein the sheet basis weight before sizing is 70g/m2When the amount of the sizing agent is 3.2 +/-0.2 g/m2(ii) a The basis weight of the paper sheet before sizing is 80g/m2In the meantime, glue is appliedThe amount is 3.6. + -. 0.2g/m2。
8. The method of claim 1, wherein the bleached kraft softwood pulp is south american bleached kraft softwood pulp sheet; the bleached sulfate hardwood pulp is south American bleached sulfate hardwood commodity pulp board.
9. Printing paper produced by the production method according to any one of claims 1 to 8.
10. Printing paper according to claim 9, characterized in that the ISO brightness of the printing paper is less than 85%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111107628.8A CN113756134A (en) | 2021-09-22 | 2021-09-22 | Printing paper and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111107628.8A CN113756134A (en) | 2021-09-22 | 2021-09-22 | Printing paper and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113756134A true CN113756134A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111107628.8A Pending CN113756134A (en) | 2021-09-22 | 2021-09-22 | Printing paper and preparation method thereof |
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2021
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Application publication date: 20211207 |