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Ink is an important material for printing.
It prints patterns and characters on paper through printing, and is an indispensable material in the printing industry
.
Ink is a homogeneous mixture composed of colored bodies (such as pigments, dyes, etc.
), binders, filling (filling) materials, additional materials, etc.
; it can be printed and dried on the printed body; it is colored and has a certain flow Degree of paste-like glue
.
Therefore, color (hue), body bone (rheological properties such as thinness and fluidity) and drying properties are the three most important properties of ink
.
01 Classified by different drying methods 1) Oxidized conjunctival drying ink 2) Permeation drying ink 3) Volatile drying ink 4) Radiation drying ink 5) Wet solidification drying ink 6) Condensation drying ink 7) Precipitation drying ink Ink 8) Two-component reaction drying ink 9) Gelling drying ink 10) Filter drying ink 11) Drying ink combined with various methods
.
02 Classified by printing process 1) Lithographic printing ink Lithographic printing ink (referred to as lithographic ink) is a kind of viscous and certain viscosity ink, most of which are oxidized conjunctival drying ink, which must have good water resistance
.
It can be divided into sheet-fed ink and web ink.
The former is mostly fast-drying oxidized conjunctival ink, and the latter is mainly based on permeation drying
.
2) Letterpress printing ink (referred to as letterpress ink) is a kind of viscous ink, and its viscosity varies widely, which is related to the printing speed of the printing machine
.
Its drying methods include osmotic drying, oxidative conjunctival drying, volatile drying, etc.
, or a combination of several drying methods
.
The embossing ink includes rotary printing ink, thermosetting ink, news ink and so on
.
3) Flexographic printing ink is a very dilute ink.
From a rheological point of view, it is the ink closest to Newtonian fluid
.
The drying of the ink is mainly accomplished by solvent volatilization, and part of the drying on the paper is achieved by the penetration of the ink into the paper
.
The ink can be divided into three types: alcohol type, mixed type and water type
.
4) Gravure printing inks (referred to as gravure inks) can be divided into two categories, one is gravure ink, and the other is engraving gravure ink
.
The former is a very thin fluid with a very low viscosity, which is completely dried by the volatilization of the solvent.
It is a volatile dry ink that can be printed on non-absorbent substrates; the latter has a higher viscosity and a relatively large yield value.
It is greasy and basically relies on oxidized conjunctiva to dry
.
5) The stencil printing ink requires good fluidity, low viscosity, low viscosity, fast through the mesh, quick penetration and drying after transfer to the surface of the absorbent substrate, and good adhesion on the surface of the non-absorbent substrate
.
Dried following ways: evaporation drying type, oxidative polymerization type, osmotic drying type, two-component reactive ultraviolet drying and the like
.
03 Requirements of different printing materials for ink 1) The embossing ink used for newsprint printing is an ink with very thin, low viscosity and good fluidity.
Its fluidity depends on the speed of the printer
.
The drying is completely absorption and penetration drying
.
Nowadays, news printing has been replaced by letterpress printing and rotary offset printing.
Flexographic printing has also been used in news printing.
Water-based inks have been used extensively in flexographic printing
.
2) For embossing and sheet-fed offset printing on coated paper and surface-treated paper, the thickness of the ink printed on coated paper should be thicker than that of uncoated paper, the ink viscosity should be a little larger, and the final drying of the ink is mainly The oxidized conjunctiva is realized; when printing on coated paper by the rotary machine, fast-drying ink is required, and at the same time, the oxidized conjunctival drying ink is gradually replaced by thermosetting ink
.
3) Non-coated paper The quality of non-coated paper is different, and the ink used must also be adapted to the requirements of various papers
.
It is usually printed with viscous ink, but it is thinner than the ink used for coated paper.
Its drying method is realized by permeation absorption and oxidized conjunctiva
.
4) commonly used to make cardboard cardboard boxes, cartons, printed packaging, hardcover book covers and so on
.
In printing, the ink requires good fluidity, low viscosity, and can withstand mechanical forces such as collisions during handling and ink sassafras
.
All printing methods can be used for printing on cardboard: relief printing or offset printing with dry oxidized conjunctiva, gravure or flexographic printing with dry penetration and volatilization
.
5) The composition of other paper 04 printing inks Printing ink is a paste-like colloid that is uniformly dispersed and mixed by pigments, binders, fillers and other materials
.
The colorant gives the printed product colorful tones; the binder acts as the carrier of the colorant and also acts as a binder to fix the colorant on the surface of the substrate; the filler imparts appropriate properties to the ink, so that the ink can meet the printability of various printing processes
.
The ink should have certain fluidity, and meet the properties required by various printing processes, and be able to dry quickly on the printed product.
The dried ink film should have corresponding various water resistance, acid resistance, alkali resistance, light resistance, rub resistance, resistance to abrasion and the like
.
1) Connecting material Connecting material is a viscous fluid.
Its function is firstly as a carrier of pigments, mixing and connecting solid particles such as powdered pigments; secondly, as a binder so that the pigment can finally be fixed on the substrate on the surface, in order to achieve display text, images, marks, decorative purposes
.
The binder to a large extent determines the viscosity, viscosity, dryness and fluidity of the ink
.
To get high-quality inks, high-quality binders must be used
.
The main components of the binder are oil (vegetable oil, mineral oil), resin, solvent and auxiliary materials
.
2) Additives due to the versatility of changes in printing conditions.
At the same time, in order to enable printers to actively adapt to changing printing conditions, use good inks and improve printing quality, it is inevitable to add several ink additives with specific properties to the ink.
Of
.
Ink additives can improve certain properties of inks.
For example, plasticizers can increase the plasticity of polymer materials and make the ink film more flexible; diluents can make the ink thinner, increase the fluidity of the ink, and reduce the fluidity of the ink.
The viscosity of the ink; the tack-removing agent is also known as the viscosity-reducing agent, which can reduce the viscosity of the ink without affecting the body of the ink; the drier (desiccant) can accelerate the drying speed of the ink; the purpose of the thinning agent is to dilute The color of the ink is also called the lightening agent; the purpose of the degelling agent is to prevent the gelation, thickening and agglomeration of the ink; the anti-drying agent (antioxidant) can delay the oxidation polymerization process of the drying oil; the anti-contaminant ( Anti-smudge agent) can prevent the ink on a printed product from smudging to the back of another printed product; surfactants can improve the dispersibility of solid components and prevent their aggregation and precipitation; preservatives can extend the storage time of water-based inks; defoaming The agent can eliminate the bubbles generated during the use of the ink; the ultraviolet absorber can improve the lightfastness of the printed matter
.
3) Pigments and dyes The colored materials used in printing inks are usually pigments, but some dyes are also useful
.
Both pigments and dyes are colored substances with extremely fine particles
.
Pigments are generally insoluble in water and binders, and most of them are called suspended states in solution; dyes are generally soluble in binders
.
The pigment must have high tinting power, hiding power, chemical stability, light resistance and other properties, and at the same time, the dispersion ability in the binder must be high
.
Commonly used in printing inks are inorganic pigments, fillers, organic dyes and dyes
.
It prints patterns and characters on paper through printing, and is an indispensable material in the printing industry
.
Ink is a homogeneous mixture composed of colored bodies (such as pigments, dyes, etc.
), binders, filling (filling) materials, additional materials, etc.
; it can be printed and dried on the printed body; it is colored and has a certain flow Degree of paste-like glue
.
Therefore, color (hue), body bone (rheological properties such as thinness and fluidity) and drying properties are the three most important properties of ink
.
01 Classified by different drying methods 1) Oxidized conjunctival drying ink 2) Permeation drying ink 3) Volatile drying ink 4) Radiation drying ink 5) Wet solidification drying ink 6) Condensation drying ink 7) Precipitation drying ink Ink 8) Two-component reaction drying ink 9) Gelling drying ink 10) Filter drying ink 11) Drying ink combined with various methods
.
02 Classified by printing process 1) Lithographic printing ink Lithographic printing ink (referred to as lithographic ink) is a kind of viscous and certain viscosity ink, most of which are oxidized conjunctival drying ink, which must have good water resistance
.
It can be divided into sheet-fed ink and web ink.
The former is mostly fast-drying oxidized conjunctival ink, and the latter is mainly based on permeation drying
.
2) Letterpress printing ink (referred to as letterpress ink) is a kind of viscous ink, and its viscosity varies widely, which is related to the printing speed of the printing machine
.
Its drying methods include osmotic drying, oxidative conjunctival drying, volatile drying, etc.
, or a combination of several drying methods
.
The embossing ink includes rotary printing ink, thermosetting ink, news ink and so on
.
3) Flexographic printing ink is a very dilute ink.
From a rheological point of view, it is the ink closest to Newtonian fluid
.
The drying of the ink is mainly accomplished by solvent volatilization, and part of the drying on the paper is achieved by the penetration of the ink into the paper
.
The ink can be divided into three types: alcohol type, mixed type and water type
.
4) Gravure printing inks (referred to as gravure inks) can be divided into two categories, one is gravure ink, and the other is engraving gravure ink
.
The former is a very thin fluid with a very low viscosity, which is completely dried by the volatilization of the solvent.
It is a volatile dry ink that can be printed on non-absorbent substrates; the latter has a higher viscosity and a relatively large yield value.
It is greasy and basically relies on oxidized conjunctiva to dry
.
5) The stencil printing ink requires good fluidity, low viscosity, low viscosity, fast through the mesh, quick penetration and drying after transfer to the surface of the absorbent substrate, and good adhesion on the surface of the non-absorbent substrate
.
Dried following ways: evaporation drying type, oxidative polymerization type, osmotic drying type, two-component reactive ultraviolet drying and the like
.
03 Requirements of different printing materials for ink 1) The embossing ink used for newsprint printing is an ink with very thin, low viscosity and good fluidity.
Its fluidity depends on the speed of the printer
.
The drying is completely absorption and penetration drying
.
Nowadays, news printing has been replaced by letterpress printing and rotary offset printing.
Flexographic printing has also been used in news printing.
Water-based inks have been used extensively in flexographic printing
.
2) For embossing and sheet-fed offset printing on coated paper and surface-treated paper, the thickness of the ink printed on coated paper should be thicker than that of uncoated paper, the ink viscosity should be a little larger, and the final drying of the ink is mainly The oxidized conjunctiva is realized; when printing on coated paper by the rotary machine, fast-drying ink is required, and at the same time, the oxidized conjunctival drying ink is gradually replaced by thermosetting ink
.
3) Non-coated paper The quality of non-coated paper is different, and the ink used must also be adapted to the requirements of various papers
.
It is usually printed with viscous ink, but it is thinner than the ink used for coated paper.
Its drying method is realized by permeation absorption and oxidized conjunctiva
.
4) commonly used to make cardboard cardboard boxes, cartons, printed packaging, hardcover book covers and so on
.
In printing, the ink requires good fluidity, low viscosity, and can withstand mechanical forces such as collisions during handling and ink sassafras
.
All printing methods can be used for printing on cardboard: relief printing or offset printing with dry oxidized conjunctiva, gravure or flexographic printing with dry penetration and volatilization
.
5) The composition of other paper 04 printing inks Printing ink is a paste-like colloid that is uniformly dispersed and mixed by pigments, binders, fillers and other materials
.
The colorant gives the printed product colorful tones; the binder acts as the carrier of the colorant and also acts as a binder to fix the colorant on the surface of the substrate; the filler imparts appropriate properties to the ink, so that the ink can meet the printability of various printing processes
.
The ink should have certain fluidity, and meet the properties required by various printing processes, and be able to dry quickly on the printed product.
The dried ink film should have corresponding various water resistance, acid resistance, alkali resistance, light resistance, rub resistance, resistance to abrasion and the like
.
1) Connecting material Connecting material is a viscous fluid.
Its function is firstly as a carrier of pigments, mixing and connecting solid particles such as powdered pigments; secondly, as a binder so that the pigment can finally be fixed on the substrate on the surface, in order to achieve display text, images, marks, decorative purposes
.
The binder to a large extent determines the viscosity, viscosity, dryness and fluidity of the ink
.
To get high-quality inks, high-quality binders must be used
.
The main components of the binder are oil (vegetable oil, mineral oil), resin, solvent and auxiliary materials
.
2) Additives due to the versatility of changes in printing conditions.
At the same time, in order to enable printers to actively adapt to changing printing conditions, use good inks and improve printing quality, it is inevitable to add several ink additives with specific properties to the ink.
Of
.
Ink additives can improve certain properties of inks.
For example, plasticizers can increase the plasticity of polymer materials and make the ink film more flexible; diluents can make the ink thinner, increase the fluidity of the ink, and reduce the fluidity of the ink.
The viscosity of the ink; the tack-removing agent is also known as the viscosity-reducing agent, which can reduce the viscosity of the ink without affecting the body of the ink; the drier (desiccant) can accelerate the drying speed of the ink; the purpose of the thinning agent is to dilute The color of the ink is also called the lightening agent; the purpose of the degelling agent is to prevent the gelation, thickening and agglomeration of the ink; the anti-drying agent (antioxidant) can delay the oxidation polymerization process of the drying oil; the anti-contaminant ( Anti-smudge agent) can prevent the ink on a printed product from smudging to the back of another printed product; surfactants can improve the dispersibility of solid components and prevent their aggregation and precipitation; preservatives can extend the storage time of water-based inks; defoaming The agent can eliminate the bubbles generated during the use of the ink; the ultraviolet absorber can improve the lightfastness of the printed matter
.
3) Pigments and dyes The colored materials used in printing inks are usually pigments, but some dyes are also useful
.
Both pigments and dyes are colored substances with extremely fine particles
.
Pigments are generally insoluble in water and binders, and most of them are called suspended states in solution; dyes are generally soluble in binders
.
The pigment must have high tinting power, hiding power, chemical stability, light resistance and other properties, and at the same time, the dispersion ability in the binder must be high
.
Commonly used in printing inks are inorganic pigments, fillers, organic dyes and dyes
.
