CN114516234A - Antifouling printing method for paper - Google Patents
Antifouling printing method for paper Download PDFInfo
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- CN114516234A CN114516234A CN202210001558.6A CN202210001558A CN114516234A CN 114516234 A CN114516234 A CN 114516234A CN 202210001558 A CN202210001558 A CN 202210001558A CN 114516234 A CN114516234 A CN 114516234A
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- Prior art keywords
- printing
- paper
- parts
- finished product
- coating liquid
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/02—Letterpress printing, e.g. book printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
-
- 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
- D21H23/50—Spraying or projecting
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
Abstract
The invention discloses an antifouling printing method of paper, which comprises the following steps: s1, paper pretreatment: putting the paper into a coating machine, and coating the front side and the back side of the paper for 5 times to obtain pretreated paper; s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink; s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper. S4, finished product processing: and shearing the dried paper into the required size by using a shearing machine to obtain a printing finished product.
Description
Technical Field
The invention relates to the technical field of paper product printing, in particular to a paper antifouling printing method.
Background
The printing of paper is various, the method is different, the operation is different, and the printing effect is different. The traditional printing method can be mainly divided into: relief, lithographic, intaglio and stencil printing. Common printing paper includes coated paper, white paperboard, white board with white bottom, white board with gray bottom, kraft paper, double-sided offset paper, matt powder paper, newsprint paper, various kinds of art paper and the like.
In the existing paper making process, ultraviolet curing printing ink is usually used for printing on the surface of a polyethylene heat shrinkage film, and then the polyethylene heat shrinkage film is attached to a paper printing base material.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the paper antifouling printing method, so that the technical problems are solved, a good antifouling effect is achieved, and the subsequent use of the paper is facilitated.
In order to achieve the purpose, the invention provides the following technical scheme: a method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front side and the back side of the paper for 5 times to obtain pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper.
S4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
30-50 parts of sodium percarbonate;
8-18 parts of ethanol;
18-28 parts of carboxymethyl cellulose;
1-5 parts of nano silicon oxide;
3-5 parts of light calcium carbonate;
1-2 parts of a defoaming agent;
0.2-0.6 part of a dispersant;
1-1.2 parts of a stabilizer.
Further, the defoaming agent is any one of emulsified silicone oil or ethylene oxide.
Further, the dispersant is polyacrylamide.
Further, the stabilizer is dibutyltin dilaurate.
Further, in the step S2, the printing temperature of the printing press during operation is 55 to 65 ℃, and the relative humidity of the printing environment is 55 to 60%.
Further, in the S2, the preheating temperature of the paper is 30-40 ℃, and the preheating time is 25-35S.
Further, in the S3, the spraying amount of the coating liquid is 8-10 g/square meter, the infrared hot air drying temperature after spraying is 55-65 ℃, and the time is 70-90S.
Compared with the prior art, the invention has the following beneficial effects: by adopting the technical scheme, the paper raw material is coated by the water-based varnish coating machine, so that the surface of the paper raw material has good uniformity, and the printing and copying effects are improved; then printing the pretreated paper raw material to obtain a printing semi-finished product with undried printing ink; and then, spraying a coating liquid on the printing semi-finished product with undried ink, covering a layer of coating which consists of fine particles and has good absorptivity to the printing ink, and forming a protective film with good stain resistance and wear resistance, wherein the protective film can absorb part of the printing ink, reduce the corrosion of the printing ink to a paper base material and be beneficial to the recovery of paper in the later period.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
A method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front side and the back side of the paper for 5 times to obtain pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper.
S4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
30-50 parts of sodium percarbonate;
8-18 parts of ethanol;
18-28 parts of carboxymethyl cellulose;
1-5 parts of nano silicon oxide;
3-5 parts of light calcium carbonate;
1-2 parts of a defoaming agent;
0.2-0.6 part of dispersant;
1-1.2 parts of a stabilizer.
In this embodiment, the defoaming agent is any one of silicone emulsion and ethylene oxide.
In this example, the dispersant is polyacrylamide.
In this example, the stabilizer was dibutyltin dilaurate.
In this embodiment, in S2, the printing temperature of the printing press during operation is 55 to 65 ℃, and the relative humidity of the printing environment is 55 to 60%.
In this embodiment, in S2, the paper is preheated at 30-40 ℃ for 25-35S.
In this embodiment, in the step S3, the coating liquid is sprayed in an amount of 8 to 10g per square meter, and the infrared hot air drying temperature after spraying is 55 to 65 ℃ for 70 to 90 seconds.
Example 2
A method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front side and the back side of the paper for 5 times to obtain pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper.
S4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
30 parts of sodium percarbonate;
8 parts of ethanol;
18 parts of carboxymethyl cellulose;
1 part of nano silicon oxide;
3 parts of light calcium carbonate;
1 part of a defoaming agent;
0.2 part of a dispersant;
1 part of stabilizer.
In this embodiment, the defoaming agent is silicone emulsion.
In this example, the dispersant is polyacrylamide.
In this example, the stabilizer was dibutyltin dilaurate.
In this embodiment, in S2, the printing temperature of the printing press during operation is 60 ℃, and the relative humidity of the printing environment is 55%.
In this embodiment, in S2, the preheating temperature of the paper is 30 ℃, and the preheating time is 25S.
In this example, in S3, the coating liquid was sprayed in an amount of 8 g/square meter, and the infrared hot air drying temperature after spraying was 55 ℃ for 70 seconds.
Example 3
A method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front side and the back side of the paper for 5 times to obtain pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper.
S4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
40 parts of sodium percarbonate;
14 parts of ethanol;
22 parts of carboxymethyl cellulose;
3 parts of nano silicon oxide;
4 parts of light calcium carbonate;
1 part of a defoaming agent;
0.4 part of a dispersant;
1.1 parts of a stabilizer.
In this embodiment, the defoaming agent is silicone emulsion.
In this example, the dispersant is polyacrylamide.
In this example, the stabilizer was dibutyltin dilaurate.
In this embodiment, in S2, the printing temperature of the printing press during operation is 60 ℃, and the relative humidity of the printing environment is 58%.
In this embodiment, in S2, the preheating temperature of the paper is 35 ℃ and the preheating time is 30S.
In this embodiment, in S3, the spraying amount of the coating liquid is 9 g/square meter, the infrared hot air drying temperature after spraying is 60 ℃, and the drying time is 80S.
Example 4
A method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front surface and the back surface of the paper for 5 times to obtain the pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: and spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of the spraying machine, and standing for 4 hours in a drying box to obtain dried paper.
S4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
50 parts of sodium percarbonate;
18 parts of ethanol;
28 parts of carboxymethyl cellulose;
5 parts of nano silicon oxide;
5 parts of light calcium carbonate;
2 parts of a defoaming agent;
0.6 part of a dispersant;
1.2 parts of a stabilizer.
In this example, the defoamer was ethylene oxide.
In this example, the dispersant is polyacrylamide.
In this example, the stabilizer was dibutyltin dilaurate.
In this embodiment, in S2, the printing temperature of the printing press during operation is 65 ℃, and the relative humidity of the printing environment is 60%.
In this embodiment, in S2, the preheating temperature of the paper is 40 ℃ and the preheating time is 35S.
In this example, the coating liquid was sprayed in an amount of 10g/m in S32The drying temperature of the infrared hot air after spraying is 65 ℃ and the drying time is 90 s.
EXAMPLES 1-4 the coating compositions and the corresponding parts by weight are shown in Table 1
| Components | Example 1 | Example 2 | Example 3 | Example 4 |
| Sodium percarbonate | 30-50 | 30 | 40 | 50 |
| Ethanol | 8-18 | 8 | 14 | 18 |
| Carboxymethyl cellulose | 18-28 | 18 | 22 | 28 |
| Nano silicon oxide | 1-5 | 1 | 3 | 5 |
| Light calcium carbonate | 3-5 | 3 | 4 | 5 |
| Defoaming agent | 1-2 | 1 | 1 | 2 |
| Dispersing agent | 0.2-0.6 | 0.2 | 0.4 | 0.6 |
| Stabilizer | 1-1.2 | 1 | 1.2 | 1.2 |
TABLE 1
Performance testing
Test samples: selected from 50 g of printed newsprint produced by Jieda paper industries, Luoyang, as a paper raw material, and then printed in the same manner as the antifouling printing method of the paper prints in examples 1 to 4 to obtain 4 kinds of printed products. (see Table 2)
| Examples | Antifouling property (100%) |
| Example 1 | 95.5 |
| Example 2 | 96.3 |
| Example 3 | 96.1 |
| Example 4 | 95.8 |
TABLE 2
As can be seen from comparison of the test results of examples 1 to 4, the use of the coating liquid greatly improved the stain resistance of the printed product, and the overall effect was good. The use of the defoaming agent, the dispersing agent and the stabilizing agent can enable the protective film formed after the coating liquid is sprayed to exert a good and stable antifouling effect, and further enable the obtained printing finished product to have high quality as a whole. The use of the defoaming agent, the dispersing agent and the stabilizing agent in the coating liquid disclosed by the invention can obtain the coating liquid with stable and good performance, and the whole printing finished product has good antifouling performance.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A method of anti-smudge printing of paper comprising the steps of:
s1, paper pretreatment: putting the paper into a coating machine, and coating the front surface and the back surface of the paper for 5 times to obtain the pretreated paper;
s2, printing pictures and texts: manufacturing a printing plate according to a printing style, mounting the printing plate on a printing machine, preheating paper, and placing the preheated printing plate under an embossing plate for printing to obtain a printing semi-finished product with undried printing ink;
s3, drying: spraying a coating liquid on the surface of the printing semi-finished product by using a sprayer, wherein the solubility of the coating liquid is the same as that of a spraying machine, and standing for 4 hours in a drying box to obtain dried paper;
s4, finished product processing: shearing the dried paper into a required size by using a shearing machine to obtain a printing finished product;
the coating liquid in the S3 comprises the following components in parts by weight:
30-50 parts of sodium percarbonate;
8-18 parts of ethanol;
18-28 parts of carboxymethyl cellulose;
1-5 parts of nano silicon oxide;
3-5 parts of light calcium carbonate;
1-2 parts of a defoaming agent;
0.2-0.6 part of dispersant;
1-1.2 parts of a stabilizer.
2. The method of claim 1, wherein the defoaming agent is one of silicone emulsion and ethylene oxide.
3. A method of anti-smudge printing of paper as claimed in claim 1,
the dispersant is polyacrylamide.
4. A method of anti-smudge printing of paper as claimed in claim 1,
the stabilizer is dibutyltin dilaurate.
5. The method according to claim 1, wherein in S2, the printing temperature of the printing press is 55-65 ℃ and the relative humidity of the printing environment is 55-60%.
6. The method for anti-smudge printing of paper as claimed in claim 1, wherein in S2, the paper is preheated at 30-40 ℃ for 25-35S.
7. The method according to claim 1, wherein in S3, the coating liquid is sprayed at a rate of 8 to 10g per square meter and the infrared hot air drying temperature after spraying is 55 to 65 ℃ for 70 to 90S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210001558.6A CN114516234A (en) | 2022-01-04 | 2022-01-04 | Antifouling printing method for paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210001558.6A CN114516234A (en) | 2022-01-04 | 2022-01-04 | Antifouling printing method for paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114516234A true CN114516234A (en) | 2022-05-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210001558.6A Pending CN114516234A (en) | 2022-01-04 | 2022-01-04 | Antifouling printing method for paper |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1826447A (en) * | 2003-06-30 | 2006-08-30 | 日本制纸株式会社 | Printing paper |
| US20060257596A1 (en) * | 2005-05-13 | 2006-11-16 | Vincenzo Catalfamo | Functionalized films |
| US20110108069A1 (en) * | 2007-11-13 | 2011-05-12 | Floran Technologies, Inc. | Method and composition for removing contamination from surfaces in contact with water |
| CN111169187A (en) * | 2020-01-16 | 2020-05-19 | 上海准典印务科技有限公司 | Printing method of stain-resistant paper |
| CN111254738A (en) * | 2020-02-25 | 2020-06-09 | 上海翔图纸品有限公司 | Antifouling printing method for paper printed matter |
| CN111454665A (en) * | 2020-05-30 | 2020-07-28 | 吴永淇 | Water-based paint and preparation method thereof |
-
2022
- 2022-01-04 CN CN202210001558.6A patent/CN114516234A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1826447A (en) * | 2003-06-30 | 2006-08-30 | 日本制纸株式会社 | Printing paper |
| US20060257596A1 (en) * | 2005-05-13 | 2006-11-16 | Vincenzo Catalfamo | Functionalized films |
| US20110108069A1 (en) * | 2007-11-13 | 2011-05-12 | Floran Technologies, Inc. | Method and composition for removing contamination from surfaces in contact with water |
| CN111169187A (en) * | 2020-01-16 | 2020-05-19 | 上海准典印务科技有限公司 | Printing method of stain-resistant paper |
| CN111254738A (en) * | 2020-02-25 | 2020-06-09 | 上海翔图纸品有限公司 | Antifouling printing method for paper printed matter |
| CN111454665A (en) * | 2020-05-30 | 2020-07-28 | 吴永淇 | Water-based paint and preparation method thereof |
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