In the printing process of packaging and decorating products, some four-color original products are difficult to control due to overprinting problems and ink-to-ink balance. It is not easy to achieve the desired reproduction effect. However, there is no problem of overprinting using spot color inks, and the ink-water balance is also relatively easy to grasp.
Although spot color inks are convenient and quick to use, not all packaging products are suitable for printing with spot color inks.
For different prints, how to reasonably use spot color inks requires technical personnel to analyze the color samples or sample drafts carefully and carefully, and adopt an accurate deployment method to allocate spot color inks. Only in this way, half of the matter can be achieved. Department of the effect.
1. When deploying inks, how to analyze the color drafts or sample drafts When analyzing color drafts, the color of the color drafts and the used inks are mainly analyzed. The principle is: the three primary colors are the basic colors of all inks, no matter how complicated the color, regardless How to change, there is no more than the scope of the three primary colors.
In the analysis of the manuscript, it is necessary to make it clear as far as possible whether the manuscript is mainly based on screen printing or on-site printing. If the network printing is the main method, the ink should be focused on the same color when the ink is blended. If the printing is mainly based on the field, the deployment can be focused on the uniform color; if the two are combined, the color and the color on the ink are mixed. It is necessary to take into account.
After analyzing the color draft, it is necessary to analyze the color of the used ink, that is, for any kind of ink, it is necessary to be good at seeing the color components therein. For example, for yellow inks, be good at discriminating whether it has a red phase or a blue phase (or green phase); for a magenta ink, be good at identifying whether it is a yellow phase or a blue phase (or a purple phase); for blue Ink, it must be good at identifying whether it is with a red or green phase (or with a yellow phase).
Assume that green ink is blended with blue ink and yellow ink. If the green ink has a red phase or the yellow ink has a red phase, the green color of the line will not be dark because this is actually equivalent to adding magenta ink to the blue and yellow ink. , and even if this part of the magenta is very small, but also the same amount of cyan and yellow according to the principle of pigment subtractive mixing black (yellow + cyan + magenta = black), add a small amount of black in the green, of course, the color of Darkening, brightness and saturation are also greatly reduced.
2. How to Determine the Hue and Formulation of an Ink Based on Chromatograms The deployment of a spot color ink usually requires a standard chromatogram, a weighing scale, and an ideal mixing environment. First, according to the hue of the color sample, the corresponding color patch is found in the chromatogram, and the percentage of the four color dot area marked by the color block is used to determine the proportion of the yellow, magenta, cyan, and black colors in the original color.
Assume that 1000 grams of light green ink is required to be formulated, and yellow (Y) 70% and cyan (C) 20% are indicated in the chromatogram, indicating that the pale green ink is mainly yellow. Assuming a print area of ​​1, the required dilution rate should be 1-70%. According to the ink formulation, the amount of each ingredient can be obtained.
The amount of ink used in a batch of jobs depends on the following factors:
1) the specifications of the paper;
2) the area of ​​the image;
3) How much is the number of impressions;
4) the type of paper;
5) The specific gravity of the ink used;
6) The amount of wear.
3. How can we accurately deploy spot color inks Spot color inks include light-color inks and dark inks. All the inks that are added to the original ink with a dilute agent are pale inks. The diluting agent is mainly used when the ink is blended, and the primary ink is the auxiliary. It should be noted:
1) Select the appropriate diluting agent according to the color sample;
2) Determine the proportional relationship between the original ink and the diluting agent according to the chromatogram and the original sample;
3) Add the selected primary inks one by one in order from light to dark;
4) Add inks in descending order according to the blending ratio;
5) After uniform deployment, use a scraper to scrape a small color sample and compare it with the original sample, or open the ink on the paper (that is, draw the ink of the same size as the mung bean on the paper, and then cover the other paper The above ink to expand contrast);
6) Minimize the use of different colors of ink, otherwise the gloss of the formulated ink will decrease and the ink will be dark;
7) The sample is preferably the same as the printing paper. The observation of the color draft and the sample must be performed under the same standard light source.
The deployment method of dark ink is basically the same as the deployment of light ink, but it should be noted that:
1) Main tone is used as main ink, supplemented with other inks. During the deployment, firstly analyze the light-dark relationship between the main color ink and the auxiliary color ink, then weigh the ink, set the main color ink on the ink distribution table, slowly add the auxiliary color ink and stir evenly, and then observe the difference from the original color sample by comparing the methods. Until it matches.
2) Choose a color that is close to the desired ink for the ink. According to the principle of subtractive color, the color after mixing will become gray, and the more the number of primary color inks, the darker the color, and the lower the brightness of the brightness and color. Therefore, in the deployment of ink, we must choose the color ink similar to the use of color requirements, to avoid the deployment of a variety of color ink. For example, dark browns are usually formulated with red ink and yellow ink with dark ink.
3) Pay attention to the color shift of the ink. Ink is usually some color cast, such as reddish, bluish, yellow, etc., when the deployment of ink must control the color of each color ink.
4. Problems to be Solved When Allocating Ink of Different Colors When spot color inks are dispensed with, in addition to observing the operating procedures, they must also pay attention to the following:
1) Matching utensils such as ink knives, ink fittings (boxes), Tian Tianping apply gasoline, and keep it clean.
2) Keep the surrounding environment clean, wipe off with ink wipes, maintain a good working environment, and develop good operating habits.
3) Keep the remaining ink on the machine table and do not dry it until it is ready for later use. It is best to pour some varnish into the remaining ink and cover it with oil paper.
4) When viewing the hue with a sheet of paper, apply the paper to be printed on a standard light source or natural light.
5) When dispensing ink, do not use a color ink ink knife to dig another color ink or auxiliary material.
6) When using drums or boxed inks, do not use ink scalpels to dig it out, but dig it up on the surface.
7) Avoid blindly adding other auxiliary materials in the ink.
8) For the larger amount of ink, desiccant is best used now, how much to add, in order to ensure quality.
9) Record the proportion of formulated ink in time to facilitate the ink mix in the next printing.
Although spot color inks are convenient and quick to use, not all packaging products are suitable for printing with spot color inks.
For different prints, how to reasonably use spot color inks requires technical personnel to analyze the color samples or sample drafts carefully and carefully, and adopt an accurate deployment method to allocate spot color inks. Only in this way, half of the matter can be achieved. Department of the effect.
1. When deploying inks, how to analyze the color drafts or sample drafts When analyzing color drafts, the color of the color drafts and the used inks are mainly analyzed. The principle is: the three primary colors are the basic colors of all inks, no matter how complicated the color, regardless How to change, there is no more than the scope of the three primary colors.
In the analysis of the manuscript, it is necessary to make it clear as far as possible whether the manuscript is mainly based on screen printing or on-site printing. If the network printing is the main method, the ink should be focused on the same color when the ink is blended. If the printing is mainly based on the field, the deployment can be focused on the uniform color; if the two are combined, the color and the color on the ink are mixed. It is necessary to take into account.
After analyzing the color draft, it is necessary to analyze the color of the used ink, that is, for any kind of ink, it is necessary to be good at seeing the color components therein. For example, for yellow inks, be good at discriminating whether it has a red phase or a blue phase (or green phase); for a magenta ink, be good at identifying whether it is a yellow phase or a blue phase (or a purple phase); for blue Ink, it must be good at identifying whether it is with a red or green phase (or with a yellow phase).
Assume that green ink is blended with blue ink and yellow ink. If the green ink has a red phase or the yellow ink has a red phase, the green color of the line will not be dark because this is actually equivalent to adding magenta ink to the blue and yellow ink. , and even if this part of the magenta is very small, but also the same amount of cyan and yellow according to the principle of pigment subtractive mixing black (yellow + cyan + magenta = black), add a small amount of black in the green, of course, the color of Darkening, brightness and saturation are also greatly reduced.
2. How to Determine the Hue and Formulation of an Ink Based on Chromatograms The deployment of a spot color ink usually requires a standard chromatogram, a weighing scale, and an ideal mixing environment. First, according to the hue of the color sample, the corresponding color patch is found in the chromatogram, and the percentage of the four color dot area marked by the color block is used to determine the proportion of the yellow, magenta, cyan, and black colors in the original color.
Assume that 1000 grams of light green ink is required to be formulated, and yellow (Y) 70% and cyan (C) 20% are indicated in the chromatogram, indicating that the pale green ink is mainly yellow. Assuming a print area of ​​1, the required dilution rate should be 1-70%. According to the ink formulation, the amount of each ingredient can be obtained.
The amount of ink used in a batch of jobs depends on the following factors:
1) the specifications of the paper;
2) the area of ​​the image;
3) How much is the number of impressions;
4) the type of paper;
5) The specific gravity of the ink used;
6) The amount of wear.
3. How can we accurately deploy spot color inks Spot color inks include light-color inks and dark inks. All the inks that are added to the original ink with a dilute agent are pale inks. The diluting agent is mainly used when the ink is blended, and the primary ink is the auxiliary. It should be noted:
1) Select the appropriate diluting agent according to the color sample;
2) Determine the proportional relationship between the original ink and the diluting agent according to the chromatogram and the original sample;
3) Add the selected primary inks one by one in order from light to dark;
4) Add inks in descending order according to the blending ratio;
5) After uniform deployment, use a scraper to scrape a small color sample and compare it with the original sample, or open the ink on the paper (that is, draw the ink of the same size as the mung bean on the paper, and then cover the other paper The above ink to expand contrast);
6) Minimize the use of different colors of ink, otherwise the gloss of the formulated ink will decrease and the ink will be dark;
7) The sample is preferably the same as the printing paper. The observation of the color draft and the sample must be performed under the same standard light source.
The deployment method of dark ink is basically the same as the deployment of light ink, but it should be noted that:
1) Main tone is used as main ink, supplemented with other inks. During the deployment, firstly analyze the light-dark relationship between the main color ink and the auxiliary color ink, then weigh the ink, set the main color ink on the ink distribution table, slowly add the auxiliary color ink and stir evenly, and then observe the difference from the original color sample by comparing the methods. Until it matches.
2) Choose a color that is close to the desired ink for the ink. According to the principle of subtractive color, the color after mixing will become gray, and the more the number of primary color inks, the darker the color, and the lower the brightness of the brightness and color. Therefore, in the deployment of ink, we must choose the color ink similar to the use of color requirements, to avoid the deployment of a variety of color ink. For example, dark browns are usually formulated with red ink and yellow ink with dark ink.
3) Pay attention to the color shift of the ink. Ink is usually some color cast, such as reddish, bluish, yellow, etc., when the deployment of ink must control the color of each color ink.
4. Problems to be Solved When Allocating Ink of Different Colors When spot color inks are dispensed with, in addition to observing the operating procedures, they must also pay attention to the following:
1) Matching utensils such as ink knives, ink fittings (boxes), Tian Tianping apply gasoline, and keep it clean.
2) Keep the surrounding environment clean, wipe off with ink wipes, maintain a good working environment, and develop good operating habits.
3) Keep the remaining ink on the machine table and do not dry it until it is ready for later use. It is best to pour some varnish into the remaining ink and cover it with oil paper.
4) When viewing the hue with a sheet of paper, apply the paper to be printed on a standard light source or natural light.
5) When dispensing ink, do not use a color ink ink knife to dig another color ink or auxiliary material.
6) When using drums or boxed inks, do not use ink scalpels to dig it out, but dig it up on the surface.
7) Avoid blindly adding other auxiliary materials in the ink.
8) For the larger amount of ink, desiccant is best used now, how much to add, in order to ensure quality.
9) Record the proportion of formulated ink in time to facilitate the ink mix in the next printing.
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