Improve the printing quality of offset printing products, in addition to high-quality paper, PS plate and other raw materials, accurate color reproduction of four-color color separation, non-color rendering, plate-making personnel to master the correct version of the PS plate exposure time, developer concentration and temperature, Monochrome, two-color and four-color offset masters adjust the amount of ink exactly to achieve the balance of ink and ink, accurate color, accurate overprinting, perfect reproduction of tone levels, clear and clean dots, and good overall results. The physical and chemical properties of the ink are determined. The quality of the printed product is good or bad. Only high-quality inks suitable for printability can print colorful and colorful worlds on glossy, white paper.
Offset printing ink is a tree finger bright fast-drying type ink, which is composed of a colorant and a binder, an adjustability adjuster, a drying adjuster, and an adjuster for improving a print effect.
The role of pigments:
1 . The ink is colored and the ink concentration is determined according to the amount.
2. Give the ink a certain amount of physical properties such as thick. 3. Maximize the ink's durability. 4. To a certain extent, the dryness of the ink is affected, and the oxidative conjunctiva type drying is the most significant.
The effect of the binder in the ink:
1. Give the ink a certain viscosity, viscosity, flowability and thixotropy. 2. Determine the type of ink drying and drying speed. 3. Determine the ink gloss, firmness and so on.
We all know that different printing methods need to use different inks for printing. We need lead printing ink for printing in the printing process; offset printing ink for offset printing; plastic printing ink for plastic printing, etc. Because these materials are different from the materials used in printing, the substrates to which the inks are attached are different. Therefore, various types of inks with different suitability are required. For example, the inks used in offset and gravure are different because they are two completely different printing methods. The required viscosity and yield value of the ink are also different. However, where is the difference between various inks? It is on the ink binder. Therefore, different printing methods have different ink flow and drying performance forms. For example, lead printing needs infiltration and drying, offset inks need to be oxidized and conjunctiva dry, and plastic printing requires volatile drying and oxidative conjunctiva drying. Because plastic printing cannot penetrate and dry, plastic simply does not absorb a bit of ink. The color of the three inks is the same. The difference is in the link material in the ink.
Offset four-color overprint printing is mainly used resin ink.
Resin inks have the following characteristics:
1. Ink fixation is faster. 2. Fast drying. 3. The ink has a strong light and bright color. 4. Strong water resistance. 5. Printing performance is better.
Resin Type Ink Type:
1. Dissolving resin binder, 2. Dispersion resin binder, 3. Colloidal resin binder, 4. Volatile resin binder.
Single-color offset printing inks are dry-wet printing during offset printing. However, four-color offset printing is wet-on-wet printing. When a color is printed in a four-color overprint, the ink is still wet on the paper in a short time, and the ink immediately overprinted with another color is called “wet wetâ€. In wet wet-on-wet printing, the properties of the ink such as viscosity, dryness, flowability, adhesion, thixotropy, and yield value determine the color of the ink.
Ink additives usually added to the ink have the following effects on the ink:
1. The addition of desiccant has a strong squeezing effect on the ink layer, usually adding about 1% of the dry oil content, and using the desiccant is now used to avoid conjunctiva. The dry oil content in the ink should not exceed 2%, the excess is easy to crystallize, the second color is more than the first color, and the winter temperature is lower than summer. 2. The addition of a varnish increases the fluidity of the ink and improves the brushing properties. However, it reduces the concentration and viscosity of the ink and reduces the drying properties of the ink. 3. The addition of a detackifier reduces the viscosity of the ink while also increasing the plasticity of the ink. 4. Add dilute agent Dilute the original ink to meet the requirements of the ink. 5. The addition of bright paste increases the brightness of the ink.
Offset inks require the following features:
First, the transparency of ink is high. When the ink is applied as a uniform film, the clearer the underlying color of the material of the ink film is required, the higher the transparency of the ink is required. The color of ink on paper has three manifestations:
1. In the form of field and halftone dots, the dots and solids (ie, 100% dots) are selected to absorb and reflect the sun's polychromatic light, and the colors appear. 2. The juxtaposition and overlap of the monochrome dots indicate that the two independent dots juxtapose or overlap each other on paper. 3. The juxtaposition of overlapping dots: That is, dots of two colors overlap on the paper to show colors. The yellow hue and the cyan color show green hue when overprinted.
Second, the ink pigment particles require delicate. In particular, finely printed books, calendars, landscapes, and other high-precision prints require fine particles of ink to produce fine-scale printing products.
Third, require strong coloring offset printing ink. Coloring power is a quantity that represents the color intensity or concentration of an ink. For inks of the same color, the tinting strength depends on:
1. The higher the degree of dispersion and dispersion of the pigment on the binder, the stronger the coloring power. 2. The higher the content and the content of the pigment, the stronger the coloring power.
four. Offset printing inks require lightfastness.
> The color of the offset ink is required to be light-resistant under the influence of sunlight and light, and the degree of discoloration and discoloration of the ink after being irradiated with light is as slow as possible. The printed products of outdoor advertisements are most likely to be discolored and discolored after being exposed to the sun and the sun. There are two colors, yellow and red, and the two colors, blue and black, are discolored and their fade is somewhat slow. It is important to solve the problems of fading and discoloration of the yellow and red colors. This is critical to improving the quality of printed products.
Fives. Requires high color efficiency of offset inks. Color efficiency is a comprehensive index of ink color difference and gray scale. Offset printing ink requires the hue of the color to be positive and pure, non-variegated.
six. The chemical properties of offset inks are stable. The color of the ink will change under the influence of some chemicals, especially the acid, alkali, salt, and oxidant will have a certain chemical reaction to the color material in the ink, and tend to be easily discolored. Therefore, the offset ink is required to have good chemical stability.
1. Water resistance. Offset printing is a type of printing that uses water. Offset printing inks are water-resistant and demulsifying.
2. Acid and alkaline resistance. Offset water and water buckets should be filled with PS version wetting powder. Offset wetting powders have the following characteristics:
1. Can fully wet the PS plate and reduce the surface tension. Contains surfactant, wetting agent, surfactant CMC. 2. With the cleaning ability to add acid. 3. Has very good non-lipid capacity to add gum arabic. 4. To stabilize the pH, place a buffer solution. 5. Moisturizers can be added to suit changes in different climates. Therefore, the PS version of the wetting powder is a high-tech product with a variety of chemical components and requires the ink to have stable chemical properties.
Offset printing ink is a tree finger bright fast-drying type ink, which is composed of a colorant and a binder, an adjustability adjuster, a drying adjuster, and an adjuster for improving a print effect.
The role of pigments:
1 . The ink is colored and the ink concentration is determined according to the amount.
2. Give the ink a certain amount of physical properties such as thick. 3. Maximize the ink's durability. 4. To a certain extent, the dryness of the ink is affected, and the oxidative conjunctiva type drying is the most significant.
The effect of the binder in the ink:
1. Give the ink a certain viscosity, viscosity, flowability and thixotropy. 2. Determine the type of ink drying and drying speed. 3. Determine the ink gloss, firmness and so on.
We all know that different printing methods need to use different inks for printing. We need lead printing ink for printing in the printing process; offset printing ink for offset printing; plastic printing ink for plastic printing, etc. Because these materials are different from the materials used in printing, the substrates to which the inks are attached are different. Therefore, various types of inks with different suitability are required. For example, the inks used in offset and gravure are different because they are two completely different printing methods. The required viscosity and yield value of the ink are also different. However, where is the difference between various inks? It is on the ink binder. Therefore, different printing methods have different ink flow and drying performance forms. For example, lead printing needs infiltration and drying, offset inks need to be oxidized and conjunctiva dry, and plastic printing requires volatile drying and oxidative conjunctiva drying. Because plastic printing cannot penetrate and dry, plastic simply does not absorb a bit of ink. The color of the three inks is the same. The difference is in the link material in the ink.
Offset four-color overprint printing is mainly used resin ink.
Resin inks have the following characteristics:
1. Ink fixation is faster. 2. Fast drying. 3. The ink has a strong light and bright color. 4. Strong water resistance. 5. Printing performance is better.
Resin Type Ink Type:
1. Dissolving resin binder, 2. Dispersion resin binder, 3. Colloidal resin binder, 4. Volatile resin binder.
Single-color offset printing inks are dry-wet printing during offset printing. However, four-color offset printing is wet-on-wet printing. When a color is printed in a four-color overprint, the ink is still wet on the paper in a short time, and the ink immediately overprinted with another color is called “wet wetâ€. In wet wet-on-wet printing, the properties of the ink such as viscosity, dryness, flowability, adhesion, thixotropy, and yield value determine the color of the ink.
Ink additives usually added to the ink have the following effects on the ink:
1. The addition of desiccant has a strong squeezing effect on the ink layer, usually adding about 1% of the dry oil content, and using the desiccant is now used to avoid conjunctiva. The dry oil content in the ink should not exceed 2%, the excess is easy to crystallize, the second color is more than the first color, and the winter temperature is lower than summer. 2. The addition of a varnish increases the fluidity of the ink and improves the brushing properties. However, it reduces the concentration and viscosity of the ink and reduces the drying properties of the ink. 3. The addition of a detackifier reduces the viscosity of the ink while also increasing the plasticity of the ink. 4. Add dilute agent Dilute the original ink to meet the requirements of the ink. 5. The addition of bright paste increases the brightness of the ink.
Offset inks require the following features:
First, the transparency of ink is high. When the ink is applied as a uniform film, the clearer the underlying color of the material of the ink film is required, the higher the transparency of the ink is required. The color of ink on paper has three manifestations:
1. In the form of field and halftone dots, the dots and solids (ie, 100% dots) are selected to absorb and reflect the sun's polychromatic light, and the colors appear. 2. The juxtaposition and overlap of the monochrome dots indicate that the two independent dots juxtapose or overlap each other on paper. 3. The juxtaposition of overlapping dots: That is, dots of two colors overlap on the paper to show colors. The yellow hue and the cyan color show green hue when overprinted.
Second, the ink pigment particles require delicate. In particular, finely printed books, calendars, landscapes, and other high-precision prints require fine particles of ink to produce fine-scale printing products.
Third, require strong coloring offset printing ink. Coloring power is a quantity that represents the color intensity or concentration of an ink. For inks of the same color, the tinting strength depends on:
1. The higher the degree of dispersion and dispersion of the pigment on the binder, the stronger the coloring power. 2. The higher the content and the content of the pigment, the stronger the coloring power.
four. Offset printing inks require lightfastness.
> The color of the offset ink is required to be light-resistant under the influence of sunlight and light, and the degree of discoloration and discoloration of the ink after being irradiated with light is as slow as possible. The printed products of outdoor advertisements are most likely to be discolored and discolored after being exposed to the sun and the sun. There are two colors, yellow and red, and the two colors, blue and black, are discolored and their fade is somewhat slow. It is important to solve the problems of fading and discoloration of the yellow and red colors. This is critical to improving the quality of printed products.
Fives. Requires high color efficiency of offset inks. Color efficiency is a comprehensive index of ink color difference and gray scale. Offset printing ink requires the hue of the color to be positive and pure, non-variegated.
six. The chemical properties of offset inks are stable. The color of the ink will change under the influence of some chemicals, especially the acid, alkali, salt, and oxidant will have a certain chemical reaction to the color material in the ink, and tend to be easily discolored. Therefore, the offset ink is required to have good chemical stability.
1. Water resistance. Offset printing is a type of printing that uses water. Offset printing inks are water-resistant and demulsifying.
2. Acid and alkaline resistance. Offset water and water buckets should be filled with PS version wetting powder. Offset wetting powders have the following characteristics:
1. Can fully wet the PS plate and reduce the surface tension. Contains surfactant, wetting agent, surfactant CMC. 2. With the cleaning ability to add acid. 3. Has very good non-lipid capacity to add gum arabic. 4. To stabilize the pH, place a buffer solution. 5. Moisturizers can be added to suit changes in different climates. Therefore, the PS version of the wetting powder is a high-tech product with a variety of chemical components and requires the ink to have stable chemical properties.
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