CN106868941A - A kind of Paper Coating method and coating coloring agent - Google Patents
A kind of Paper Coating method and coating coloring agent Download PDFInfo
- Publication number
- CN106868941A CN106868941A CN201510917800.4A CN201510917800A CN106868941A CN 106868941 A CN106868941 A CN 106868941A CN 201510917800 A CN201510917800 A CN 201510917800A CN 106868941 A CN106868941 A CN 106868941A
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- China
- Prior art keywords
- coating
- paper
- coloring agent
- emulsion
- alkali
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
- D21H21/28—Colorants ; Pigments or opacifying 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
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- Paper (AREA)
Abstract
The invention discloses the method and coating coloring agent of a kind of Paper Coating.After the method for Paper Coating is dyeed with coloring agent by coating to coating emulsion, the coating emulsion of dyeing is then recycled to be coated.Distribution after coating according to paper surface color judges the uniformity of coating.Through the above way, the present invention can intuitively assess the uniformity of Paper Coating, and quickly lifting coating machine adjusts engine efficiency, simple to operate, with low cost.
Description
Technical field
A kind of Paper Coating method of the present invention and coating coloring agent.
Background technology
Coating technique is widely used in adding liquid or liquid material on thin paper, common are roller coat,
Spraying etc..Special chemical drug is added on paper for daily use using coating machine, paper can be improved corresponding
Performance, softening agent is coated with such as on thin paper can improve the soft feel of paper, lifting paper quality;
Coated antibacterial agent solution can improve paper anti-microbial property, it is to avoid paper goes mouldy after making moist;Coating is deodorant
Agent emulsion can make the sheet paper products have deodorant function;Silicon-coating class emulsion can increase paper cunning
Sense.
Because most of chemical drugs being coated on paper for daily use are all colourless or very slight colors, therefore
The whether uniform of coating cannot be intuitively judged in coating process.Be unevenly coated refers to that body paper exists
In coating process, influenceed by certain factor, cause paper industry coated face partial coating rare, sternly
Heavy is local close to holiday.It is weighing method to calculate the general method of coating weight, that is, weigh coating front and rear
The weight of paper calculates coating weight.Calculate the coating weight on different banners and can determine whether whether coating is equal
Even, this method is not accurate enough and more delayed, it is impossible to judge the uniform situation of Paper Coating at any time.
And also be difficult to reach satisfied state after tune machine, cause to be unevenly coated.Being unevenly coated to enter
One step causes sheet processing unstable into the quality of product after finished product.
The content of the invention
Even if how easily the present invention solves the technical problem of assessment Paper Coating is equal
Evenness.
In view of this, the embodiment of the present invention provides method and the coating dyeing of a kind of Paper Coating
Agent, can simple, intuitive again efficiently assess Paper Coating the uniformity.
In order to solve the above technical problems, one aspect of the present invention is:A kind of painting is provided
Cloth coloring agent, the coating coloring agent is made up of alkali, basic indicator and solvent.
Wherein, the alkali is potassium hydroxide, NaOH, barium hydroxide, calcium hydroxide, carbonic acid
One kind in potassium, sodium carbonate;The basic indicator is in phenolphthalein, o-cresolphthalein or diformazan phenolphthalein
One of which;The solvent be water, ethanol, propane diols, glycerine and butanediol in extremely
Few one kind.
Wherein, in the coating coloring agent, the mass percent of the alkali is 10-70%, described
The mass percent of basic indicator is 0.5-10%, and remaining is solvent.
In order to solve the above technical problems, another technical solution used in the present invention is:There is provided a kind of
The method of Paper Coating, the described method comprises the following steps:By coating coloring agent and coating emulsion
Mixing and stirring, forms dyeing coating emulsion, wherein, the coating coloring agent is by alkali, alkali
Property indicator and solvent composition;The dyeing is coated with emulsion coating on paper, based on described
The uniformity of the dyeing coating emulsion in the distribution assessment Paper Coating of paper surface.
Wherein, the coating coloring agent is with the amount relative to the coating quality of the emulsion 0.5-10%
Mix with the coating emulsion.
Wherein, the coating coloring agent is with the amount relative to the coating quality of the emulsion 1-5% and institute
State coating emulsion mixing.
Wherein, the used agitator of the stirring is pusher, paddle and turbine agitator
In at least one, the stirring-head of the agitator is Ping Yeshi or hinging type;The stirring is stirred
Speed is mixed for 1-500rpm, mixing time is 2-60 minutes.
Wherein, in the coating coloring agent, the alkali is potassium hydroxide, NaOH, hydrogen-oxygen
Change the one kind in barium, calcium hydroxide, potassium carbonate, sodium carbonate;The basic indicator be phenolphthalein,
One of which in o-cresolphthalein or diformazan phenolphthalein;The solvent is water, ethanol, propane diols, third
At least one in triol and butanediol.
Wherein, in the coating coloring agent, the mass percent of the alkali is 10-70%, described
The mass percent of basic indicator is 0.5-10%, and remaining is solvent.
Wherein, it is described that Paper Coating is assessed in the distribution of paper surface based on the dyeing coating emulsion
The uniformity include:By the image processing equipment with GTG transformation function, to the paper after coating
Open image procossing and obtain gray scale image;Judge whether occur ± 5% in the gray scale image whole region
Difference, if not occurring, then it represents that coating uniformity is up to standard, otherwise, represent coating uniformity not
It is up to standard.
The beneficial effects of the invention are as follows:The situation of prior art is different from, the present invention is used by being coated with
After coloring agent is dyeed to coating emulsion, the coating emulsion of dyeing is then recycled to be coated.
Distribution after coating according to paper surface color judges the uniformity of coating.And the dyeing of paper surface
Agent color can disappear with the disappearance of Paper Moisture, therefore not influence the outward appearance of paper after coating.
By such mode, can realize that simple, intuitive efficiently assesses the uniformity of Paper Coating again.
Brief description of the drawings
Fig. 1 is the flow chart of the method for Paper Coating provided in an embodiment of the present invention;
Fig. 2 is that web area provided in an embodiment of the present invention divides schematic diagram.
Specific embodiment
The embodiment of the present invention provides a kind of coating coloring agent, and the coloring agent is mainly used in Paper Coating
Use.The coating of the embodiment of the present invention is main by alkali, basic indicator and solvent group with coloring agent
Into.
Wherein, above-mentioned alkali can be potassium hydroxide, NaOH, barium hydroxide, calcium hydroxide,
One or more combination in potassium carbonate, sodium carbonate, preferably uses potassium hydroxide, hydroxide
One of which or various combinations in sodium, barium hydroxide.Above-mentioned basic indicator can be
Any reagent of alkali Show Color can be met, for example, can be phenolphthalein, o-cresolphthalein
Or the one of which in diformazan phenolphthalein.And solvent can dissolve appointing for alkali and basic indicator
A kind of what solvent, such as can be one of which in water, ethanol, glycerine and butanediol or
The various combination of person.
Wherein, in above-mentioned coating coloring agent, the mass percent of alkali is 10-70%, such as
20%th, 30%, 25%, 55%, 60% etc., preferably 20-50%, such as 25%, 30%,
25%th, 35%, 45%, 40% etc..The mass percent of basic indicator is 0.5-10%, than
Such as 1%, 2%, 5%, 8%, preferably 1-5%, such as 3%, 3.5%, 4.5% etc..
Remaining is solvent.
Wherein, Fig. 1 is referred to, Fig. 1 is a kind of side of Paper Coating provided in an embodiment of the present invention
The flow chart of method, as illustrated, the method for the Paper Coating of the present embodiment is comprised the following steps:
S101:By coating coloring agent and coating emulsion mixing and stirring, dyeing coating breast is formed
Liquid, wherein, coating coloring agent is made up of alkali, basic indicator and solvent.
Wherein, coating coloring agent is with the amount relative to coating quality of the emulsion 0.5-10% and coating breast
Liquid mixes.Wherein preferably mixed with coating emulsion with the amount of 1-5%.That is, the present invention is implemented
Example in add a small amount of coloring agent can just treat coating emulsion dyeed.Due to emulsion to be coated
Viscosity and solid content have directly influence, therefore the coloring agent that the present invention is provided on the coating weight of paper
The viscosity and solid content that amount of the addition in emulsion to be coated is intended to not change substantially emulsion are defined.Again
Because the coloring agent that the present invention is provided is stable in properties, the property such as solid content, viscosity to emulsion to be coated
The influence that matter is produced is smaller.
When coating coloring agent is mixed with coating emulsion, the agitator for being used can be pushed away
Enter any one of formula, paddle and turbine agitator or several combinations are stirred, its
In, the stirring-head of agitator can be straight leaf or hinged joint.Wherein, when being stirred, stirring
Speed can be 1-500rpm, preferably 20-100rpm.Mixing time 2-60 minutes, preferably 5-10
Minute.The long meeting of mixing time causes that excessive carbon dioxide is incorporated in emulsion and reduces emulsion
PH, further makes emulsion lighter, while full of bubble without easy to apply in also making emulsion,
But the time is too short, full and uniform dyeing can not be carried out to emulsion.
Wherein, the alkali in coating coloring agent can be potassium hydroxide, NaOH, barium hydroxide,
One or more combination in calcium hydroxide, potassium carbonate, sodium carbonate, preferably uses hydroxide
One of which or various combinations in potassium, NaOH, barium hydroxide.Above-mentioned alkalescence refers to
Show that agent can be any reagent that can meet alkali Show Color, for example, can be phenolphthalein,
One of which in o-cresolphthalein or diformazan phenolphthalein.And solvent can dissolve alkali and alkalescence refers to
Show any solvent of agent, such as can be its in water, ethanol, glycerine and butanediol
In one or more combination.
Wherein, in above-mentioned coating coloring agent, the mass percent of alkali is 10-70%, such as
20%th, 30%, 25%, 55%, 60% etc., preferably 20-50%, such as 25%, 30%,
25%th, 35%, 45%, 40% etc..The mass percent of basic indicator is 0.5-10%, than
Such as 1%, 2%, 5%, 8%, preferably 1-5%, such as 3%, 3.5%, 4.5% etc..
Remaining is solvent.
Coating dyeing agent prescription preparation method can be:(1) alkali is added to the water stirring, is made
Alkali is substantially dissolved in water, forms the aqueous solution;(2) basic indicator is added in the aqueous solution of alkali,
It is stirred well to indicator to be dissolved completely in aqueous slkali, obtains the very deep coating coloring agent of color
Solution.
Or coating coloring agent can also make by the following method:(1) basic indicator is added
Enter and dissolve wiring solution-forming in organic solvent, the concentration of indicator solution can be 20%-90%;(2)
Alkali is added to the water stirring, alkali is substantially dissolved in water, form the aqueous solution;(2) in the water of alkali
Indicator solution is added in solution or aqueous slkali is added in the solution of indicator, is stirred well to
System is mixed thoroughly, and obtains color very deep coating dyeing agent solution.
S102:By dyeing coating emulsion coating on paper, based on dyeing coating emulsion in paper table
The uniformity of the distribution assessment Paper Coating in face.
Coating process can be coated using existing conventional coating techniques in the embodiment of the present invention, coating
Mode can be print roll coating, airblade coating or scraper for coating, preferably print roll coating.Coating pressure
Power can be 200KPa-400KPa, and coating weight can be 1%-50%.
It is whether uniformly whether uniform to judge coating according to distribution of color on paper after coating, specific
When realizing, can be by being divided into the region of more than three to paper banner, such as A, B, C (please
Reference picture 2), then assess coating uniformity by the following method.
Method one:By the image processing equipment with GTG transformation function, to the paper after coating
Whether image procossing obtains gray scale image, judges occur ± 5% difference in gray scale image whole region
It is different, if not occurring, then it represents that coating uniformity is up to standard, otherwise, represent that coating uniformity is below standard.
In the method, using the image processing equipment with GTG transformation function to the paper after coating
Image is processed, and the image processing equipment can use CMOS or ccd image sensor, will
Paper image is converted to electronic signal.The image processing equipment has at least more than 32 grades of GTG,
The image procossing that will be shot is gray scale image.The gray scale image is processed, if in gray scale image
A certain region occurs the difference more than ± 5% grade with neighboring area, that is, be considered as and be unevenly coated;If whole
There is not ± 5% grade of difference in individual region, then be considered as coating uniform.
After coating emulsion coating after dyeing is on the paper, with the continuous reduction of Paper Moisture,
Aubergine on paper can also fade away, therefore, the coloring agent that the present invention is provided will not be to paper
Outward appearance produce influence.
Certainly, as alternatively possible implementation, it is also possible to observe by the naked eye, check and
Contrast the depth of color in each zoning.If occur in paper web the relatively deep region of color and
Relatively shallower region is to be considered as to be unevenly coated;If regional does not occur in whole paper banner
Obvious shade difference, that is, be considered as coating uniform.
In addition, also subsequent step treatment can be carried out, to the equal of coating after the completion of uniformity assessment
Evenness is improved.The deeper region of color in paper banner, its coating weight is higher, regulation coating
Machine parameter, coating pressure corresponding for this region are suitably reduced, and can reduce the painting in this region
Cloth amount;The shallower region of color in paper banner, its coating weight is relatively low, for this region correspondence
Coating pressure suitably increase, to increase the coating weight in this region.
Above step is iteratively repeated, the parameter to coating machine is adjusted repeatedly, until the paper after coating
Regional shade is consistent above, illustrates that coating is uniform.After paper is air-dried, color disappears naturally
Lose, texture of paper and other physical property are not influenceed.Tune machine is carried out to coating machine to coating is uniform, coating
After machine parameter determination, achromophil emulsion can be used instead and be normally coated with.
To further illustrate the above method of the invention, below in conjunction with specific embodiment to above-mentioned side
Method is illustrated, and embodiment described below is that representative cited by the present invention has
A limit embodiment, specific material, formula rate and the reaction condition being previously mentioned only this hair
Embodying for the bright above-mentioned material being previously mentioned, formula rate and reaction condition, is not used to limit
Protection scope of the present invention processed.
Embodiment 1. configures coloring agent 1 and is used for potassium hydroxide, o-cresolphthalein, water as raw material
Coating
The running water of 20 equal portions is weighed in beaker, the potassium hydroxide of 10 equal portions is added, is sufficiently stirred for,
In potassium hydroxide is dissolved completely in water.To adding 1 equal portions in above potassium hydroxide aqueous solution
O-cresolphthalein, continues to stir, in o-cresolphthalein powder is dissolved completely in potassium hydroxide aqueous solution,
Obtain the very deep purple dye agent 1 of color.The heat release when the water due to alkali soluble, now coloring agent temperature
It is higher, used after being cooled to room temperature.
To the coloring agent 1 (0.5 kilogram) of addition 1% in 50 kilograms of softening agents to be coated, stirring is equal
It is even.The basic physical properties tested before and after emulsion dyeing to be coated, are shown in Table 1, illustrate emulsion before and after dyeing
Basic physical properties without significant change.Emulsion after applying cloth dyeing on thin paper, paper shows after coating
Purple, it is found that on same banner that a-quadrant paper color is moderate compared with deep, B field colors, C regions
Color is shallower.According to this result, coating machine parameter is adjusted, the corresponding coating in a-quadrant
Pressure suitably increases, and the corresponding coating pressure in C regions suitably reduces, and adjusts repeatedly, until same
Different zones shade is consistent on banner, illustrates that coating is uniform, before and after regulation coating machine parameter
Coating result is shown in Table 2.Find that coating is uniform after being verified with weighing method.After coating machine parameter determination,
Change the emulsion of dyeing into common emulsion, be normally coated with.The paper of normal coating is through weighing
Method verifies that its coating weight meets the requirements, and coating uniformity is preferable.
Embodiment 2. is used in combination with NaOH, phenolphthalein, water, ethanol as raw material configuration coloring agent 2
In coating
The phenolphthalein of 1.5 equal portions is dissolved in the ethanol of 1.5 equal portions;30 equal portions are weighed in beaker
Running water, adds the NaOH of 10 equal portions, is sufficiently stirred for, until potassium hydroxide is completely dissolved
In water.To the ethanol solution for adding phenolphthalein in above potassium hydroxide aqueous solution, continue to stir, directly
It is mixed thoroughly to system, obtains the very deep red staining agent 2 of color.Because alkali soluble is when the water
Heat release, now coloring agent temperature is higher, is used after being cooled to room temperature.
To the coloring agent 2 (1.5 kilograms) of addition 3% in 50 kilograms of softening agents to be coated, stirring is equal
It is even.The basic physical properties tested before and after emulsion dyeing to be coated, are shown in Table 1, illustrate emulsion before and after dyeing
Basic physical properties without significant change.Emulsion after applying cloth dyeing on thin paper, paper shows after coating
Red, it is found that a-quadrant and B regions paper color are deeper on same banner, and C field colors are shallower.
According to this result, coating machine parameter is adjusted, the corresponding coating pressure in C regions suitably subtracts
It is small, adjust repeatedly, until different zones shade unanimously illustrates that coating is uniform on same banner,
Coating result before and after regulation coating machine parameter is shown in Table 2.Find that coating is uniform after being verified with weighing method.
After coating machine parameter determination, the emulsion of dyeing is changed into common emulsion, be normally coated with.Just
Often the paper of coating verifies that its coating weight meets the requirements, and coating uniformity is preferable through weighing method.
Table 1:The basic physical properties contrast of softening agent before and after dyeing
Emulsion physical property | Solid content (%) | Viscosity (cp) |
Softening agent to be coated | 55.20 | 82.5 |
The coloring agent of softening agent+1% 1 to be coated | 54.82 | 83.3 |
The coloring agent of softening agent+3% 2 to be coated | 54.29 | 85.1 |
Comparative result before and after the embodiment 1 of table 2 and the coating adjustment of embodiment 2
The detailed description of Paper Coating method and coating coloring agent that the embodiment of the present invention is provided,
It is appreciated that coloring agent of the invention is in bright gay color, addition is in colourless or tint emulsion to emulsion
Dyeed, the emulsion after dyeing is coated, can be according to the distribution of color situation of paper after coating
Judge coating uniformity.
Paper Moisture after coating reduces, air-dry after, aubergine Lock-out does not influence paper
Outward appearance and other physical property.Coating machine parameter is adjusted according to paper color distribution further, directly
Uniform to distribution of color, i.e. explanation coating is uniform.This method can intuitively assess Paper Coating
The uniformity, and quickly lifting coating machine adjusts engine efficiency, it is simple to operate, it is with low cost.
Embodiments of the invention are the foregoing is only, the scope of the claims of the invention is not thereby limited,
Equivalent structure or equivalent flow conversion that every utilization description of the invention and accompanying drawing content are made, or
Other related technical fields are directly or indirectly used in, patent of the invention are similarly included in and are protected
In the range of shield.
Claims (10)
1. a kind of coating coloring agent, it is characterised in that the coating coloring agent is by alkali, alkalescence
Indicator and solvent are constituted.
2. coating coloring agent according to claim 1, it is characterised in that the alkali is hydrogen
One kind in potassium oxide, NaOH, barium hydroxide, calcium hydroxide, potassium carbonate, sodium carbonate;
The basic indicator is the one of which in phenolphthalein, o-cresolphthalein or diformazan phenolphthalein;The solvent
It is at least one in water, ethanol, propane diols, glycerine and butanediol.
3. coating coloring agent according to claim 1, it is characterised in that the coating is used
In coloring agent, the mass percent of the alkali is 10-70%, the quality percentage of the basic indicator
Than being 0.5-10%, remaining is solvent.
4. a kind of method of Paper Coating, it is characterised in that the described method comprises the following steps:
By coating coloring agent and coating emulsion mixing and stirring, dyeing coating emulsion is formed, its
In, the coating coloring agent is made up of alkali, basic indicator and solvent;
The dyeing is coated with emulsion coating on paper, based on the dyeing coating emulsion in paper
The uniformity of the distribution assessment Paper Coating on surface.
5. method according to claim 4, it is characterised in that the coating coloring agent with
Amount relative to the coating quality of the emulsion 0.5-10% mixes with the coating emulsion.
6. method according to claim 5, it is characterised in that the coating coloring agent with
Amount relative to the coating quality of the emulsion 1-5% mixes with the coating emulsion.
7. method according to claim 4, it is characterised in that what the stirring was used stirs
To mix device be at least one in pusher, paddle and turbine agitator, and the agitator is stirred
Head is mixed for Ping Yeshi or hinging type;The mixing speed of the stirring is 1-500rpm, and mixing time is
2-60 minutes.
8. method according to claim 4, it is characterised in that in the coating coloring agent,
The alkali is potassium hydroxide, NaOH, barium hydroxide, calcium hydroxide, potassium carbonate, sodium carbonate
In one kind;The basic indicator is the one of which in phenolphthalein, o-cresolphthalein or diformazan phenolphthalein;
The solvent is at least one in water, ethanol, propane diols, glycerine and butanediol.
9. method according to claim 4, it is characterised in that in the coating coloring agent,
The mass percent of the alkali is 10-70%, and the mass percent of the basic indicator is
0.5-10%, remaining is solvent.
10. method according to claim 4, it is characterised in that described to be applied based on the dyeing
Cloth emulsion includes in the uniformity of the distribution assessment Paper Coating of paper surface:
By the image processing equipment with GTG transformation function, to the paper image treatment after coating
Obtain gray scale image;
Judge ± 5% difference whether occur in the gray scale image whole region, if not occurring,
Represent that coating uniformity is up to standard, otherwise, represent that coating uniformity is below standard.
Priority Applications (1)
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CN201510917800.4A CN106868941A (en) | 2015-12-10 | 2015-12-10 | A kind of Paper Coating method and coating coloring agent |
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CN201510917800.4A CN106868941A (en) | 2015-12-10 | 2015-12-10 | A kind of Paper Coating method and coating coloring agent |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114606798A (en) * | 2020-12-09 | 2022-06-10 | 金红叶纸业集团有限公司 | Color paper and preparation method thereof |
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CN104520388A (en) * | 2012-03-16 | 2015-04-15 | 3M创新有限公司 | Colored masking liquid composition and method of using |
CN104710887A (en) * | 2015-03-31 | 2015-06-17 | 山西大学 | Water soluble interior wall coating with indication function and preparation method thereof |
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CN1330118A (en) * | 2000-06-15 | 2002-01-09 | 张翼 | Allochroic paint with time indication function and its preparing process |
EP1847572A1 (en) * | 2006-04-21 | 2007-10-24 | Roberto Grassellini | Water based colour changing coatings and process of preparing them |
CN104520388A (en) * | 2012-03-16 | 2015-04-15 | 3M创新有限公司 | Colored masking liquid composition and method of using |
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Application publication date: 20170620 |