Ink blending is also called ink blending or ink blending, that is, adjusting the printability of the ink during the printing process, or using the color subtractive method to blend the ink of the desired hue with the three primary inks, which is an indispensable important in the printing process. Link. Whether the ink is properly blended directly affects the quality of the printed matter. In this article, the author will share with you the basic principles and practices of ink blending.
Basic principles of ink blending
1. Concentrated
Concentrated light printing means that the required ink is formulated to be slightly thicker than the color sample, and the amount of ink is intentionally reduced during printing to meet the color sample requirements. This is because the hue of the ink is greatly affected by the thickness of the ink layer, and the same ink is used for printing. When the thickness of the ink layer changes, the hue of the ink layer also changes, especially when printing by an offset printing process, which is limited by the offset printing process. The ink layer should be thin and not thick.
2. Use as few color materials as possible
According to the color reduction method, when the ink is formulated, the more the color materials used, the darker the color of the formulated ink. Therefore, try to use the least amount of color material to maintain the brightness of the ink color. In addition, you must make good use of black ink and white ink. In any ink, the addition of black ink will darken the ink color, and the addition of white ink will reduce the saturation of the ink color.
3. Grasp the change of hue before and after drying of the ink
The hue of the same ink before and after drying differs greatly, especially for screen printing inks. For example, a light gray ink is prepared, and the color of the color sample scraped when it is just adjusted is in accordance with the original color sample, but after the ink is dried, the color thereof is significantly deeper. A similar situation can occur with inks of other colors.
In order to avoid this situation, the ink should first be shaved when the ink is prepared. After the ink of the color sample is dried, it is compared with the original color sample to prevent the color before the ink drying from conforming to the color sample and the color is out of shape after drying. Loss due to color mismatch.
4. More than
To match any kind of ink, first determine the main color according to the original color sample, and based on this, add the auxiliary color until the color meets the requirements of the original color sample. For example, if the light gray ink is blended, white ink should be used as the main component, and a small amount of black ink should be added to form a light gray ink. For dark gray inks, black ink should be used, and a small amount of white ink should be added to form dark gray ink. In the actual work, according to the specific circumstances, carefully analyze the composition of the color of the original color sample ink, determine the main and auxiliary relationship of the ink, according to the principle of "multiple-based".
Some practices of ink blending
1. Ink printing suitability adjustment
Fluidity and drying speed are the two main properties of the ink, and special care is required when performing ink blending.
(1) Ink fluidity
The requirements for ink flow are different depending on the substrate. For example, a primary color ink, when printed on double coated paper, its fluidity meets the printing requirements, and when printed on a double-adhesive paper, it is necessary to increase the fluidity of the ink to adapt to the printing suitability of the double-adhesive paper. Under normal circumstances, a substrate with a smooth surface and poor penetration ability requires a small fluidity of the printing ink, and a substrate having a rough surface and a strong penetrating ability requires a large fluidity of the printing ink.
(2) Drying speed of ink
The drying of ordinary inks is mainly realized by three forms of volatilization, permeation and surface oxidation and conjunctiva, all of which are affected by the temperature and humidity of the printing environment. Therefore, when adjusting the drying speed of the ink, it is necessary to fully consider the change of the temperature and humidity of the printing environment.
2. Gold ink and spot color ink blending
Gold inks and spot color inks are two special types of inks. The mixing method is different from ordinary inks and requires special attention.
(1) Gold ink blending
1 offset gold ink blending
Offset gold ink is divided into two types: blue light gold and red light gold. Under normal circumstances, offset gold ink does not need to be blended, and can be directly printed with original ink. If you need to change the color of the offset gold ink, you can add a small amount of ink of other colors to change the hue of the offset gold ink, but it does not affect the printability of the offset gold ink. For example, the color of the glazed gold is not bright enough after printing, and the printed matter looks dull. If a small amount of yellow ink is added to the glazed gold, the brightness of the glazed gold can be increased. It is worth noting that the amount of other color inks must be less, otherwise it is easy to adjust to fake gold ink, losing the color that gold ink should have.
2 screen printing gold ink distribution
There are many varieties of screen printing gold ink, and the selection is large. Under normal circumstances, you can directly use the original color screen printing gold ink. When the screen printing gold ink hue needs to be fine-tuned, a small amount of ink of the desired hue can be added to the primary color screen printing gold ink, but the color selection must be appropriate. If the required ink color is lighter gold, silver ink can be added to the primary color screen printing gold ink, or white ink can be added, but the gold ink blended with white ink will give a feeling of "fake gold", so It is best not to use white ink. In addition to the above methods, gold inks of different hue can also be formulated by using gold oil and flash silver powder.
(2) Distribution of spot color inks
When performing spot color proofing or spot color printing, the ink adjuster needs to perform the spot color ink blending based on years of experience. If the mixing technique of the ink-adjusting personnel is not enough, the brightness of the adjusted ink will be incorrect or the ink will not be re-distributed until it is printed on the machine. Moreover, because the spot color ink has a large dry retreat change on the offset paper, and the variation values ​​of the spot color inks of different color systems are greatly different, it is necessary to continuously adjust on the original basis to explore the law of dry retreat, so we It is necessary to fully understand the blending technology of the spot color ink to prevent unnecessary troubles such as quality accidents, ink waste, repeated labor of workers, delay of construction period, etc. due to experience alone.
3. Use computer color matching system
After understanding the basic principles of ink blending, in order to complete the printing of products with extremely high color requirements, it is necessary to use an advanced computer color matching system to match colors to meet customer acceptance criteria. Nowadays, customers no longer judge the print quality by virtue of the naked eye, but according to the Lab standard value of a given color block or color bar, and require that the color difference range does not exceed ±1.5. The customer's acceptance requirements obviously cannot be met by the experience of the master. Instead, professional instruments must be used to measure the color blocks or color bars of the printed matter, so the dataization of the ink formulation and the automation of the ink color matching must be achieved.
Printing companies need to choose a computer color matching system that meets the product requirements according to their business characteristics. This article takes the X-Rite color matching software as an example to introduce the actual usage of the computer color matching system. Usually, companies will refine the commonly used inks, including yellow, yellow, black, green, orange, dark blue, magenta and so on. According to the experimental data, an ink having a small dry-returning change and a good stability was selected as the composition of the color-matching ink. After receiving the customer's request for the color of the color sample, first input the measured paper color into the color matching system with the X-Rite spectrophotometer, and then input the standard value into the color matching system, and the system will automatically analyze several sets of color matching schemes. According to the color scheme given by the system, the color sample is presented on the substrate by means of the colorimeter, and then the Lab value is measured and adjusted within the standard color difference range. After the result is qualified, the ink is formulated according to the obtained formula, and is used for batch proofing of actual production.
Since there is a certain gap between the printing color exhibited by the color developing device and the printing color obtained in the actual production, the ink adjusting personnel will measure the Lab value of the color block or color strip actually produced by the device, and find out the change rule and reuse it. The computer color matching system performs complementary color correction, and then it is produced on the machine. After passing the test, the color matching data is stored for later recall in mass production.
In short, when formulating inks, operators not only need to gradually explore the methods and experience of blending inks in practice, but also use advanced equipment and equipment, which not only can improve production efficiency, but also bring economic benefits to enterprises.
Ink blending is also called ink blending or ink blending, that is, adjusting the printability of the ink during the printing process, or using the color subtractive method to blend the ink of the desired hue with the three primary inks, which is an indispensable important in the printing process. Link. Whether the ink is properly blended directly affects the quality of the printed matter. In this article, the author will share with you the basic principles and practices of ink blending.
Basic principles of ink blending
1. Concentrated
Concentrated light printing means that the required ink is formulated to be slightly thicker than the color sample, and the amount of ink is intentionally reduced during printing to meet the color sample requirements. This is because the hue of the ink is greatly affected by the thickness of the ink layer, and the same ink is used for printing. When the thickness of the ink layer changes, the hue of the ink layer also changes, especially when printing by an offset printing process, which is limited by the offset printing process. The ink layer should be thin and not thick.
2. Use as few color materials as possible
According to the color reduction method, when the ink is formulated, the more the color materials used, the darker the color of the formulated ink. Therefore, try to use the least amount of color material to maintain the brightness of the ink color. In addition, you must make good use of black ink and white ink. In any ink, the addition of black ink will darken the ink color, and the addition of white ink will reduce the saturation of the ink color.
3. Grasp the change of hue before and after drying of the ink
The hue of the same ink before and after drying differs greatly, especially for screen printing inks. For example, a light gray ink is prepared, and the color of the color sample scraped when it is just adjusted is in accordance with the original color sample, but after the ink is dried, the color thereof is significantly deeper. A similar situation can occur with inks of other colors.
In order to avoid this situation, the ink should first be shaved when the ink is prepared. After the ink of the color sample is dried, it is compared with the original color sample to prevent the color before the ink drying from conforming to the color sample and the color is out of shape after drying. Loss due to color mismatch.
4. More than
To match any kind of ink, first determine the main color according to the original color sample, and based on this, add the auxiliary color until the color meets the requirements of the original color sample. For example, if the light gray ink is blended, white ink should be used as the main component, and a small amount of black ink should be added to form a light gray ink. For dark gray inks, black ink should be used, and a small amount of white ink should be added to form dark gray ink. In the actual work, according to the specific circumstances, carefully analyze the composition of the color of the original color sample ink, determine the main and auxiliary relationship of the ink, according to the principle of "multiple-based".
Some practices of ink blending
1. Ink printing suitability adjustment
Fluidity and drying speed are the two main properties of the ink, and special care is required when performing ink blending.
(1) Ink fluidity
The requirements for ink flow are different depending on the substrate. For example, a primary color ink, when printed on double coated paper, its fluidity meets the printing requirements, and when printed on a double-adhesive paper, it is necessary to increase the fluidity of the ink to adapt to the printing suitability of the double-adhesive paper. Under normal circumstances, a substrate with a smooth surface and poor penetration ability requires a small fluidity of the printing ink, and a substrate having a rough surface and a strong penetrating ability requires a large fluidity of the printing ink.
(2) Drying speed of ink
The drying of ordinary inks is mainly realized by three forms of volatilization, permeation and surface oxidation and conjunctiva, all of which are affected by the temperature and humidity of the printing environment. Therefore, when adjusting the drying speed of the ink, it is necessary to fully consider the change of the temperature and humidity of the printing environment.
2. Gold ink and spot color ink blending
Gold inks and spot color inks are two special types of inks. The mixing method is different from ordinary inks and requires special attention.
(1) Gold ink blending
1 offset gold ink blending
Offset gold ink is divided into two types: blue light gold and red light gold. Under normal circumstances, offset gold ink does not need to be blended, and can be directly printed with original ink. If you need to change the color of the offset gold ink, you can add a small amount of ink of other colors to change the hue of the offset gold ink, but it does not affect the printability of the offset gold ink. For example, the color of the glazed gold is not bright enough after printing, and the printed matter looks dull. If a small amount of yellow ink is added to the glazed gold, the brightness of the glazed gold can be increased. It is worth noting that the amount of other color inks must be less, otherwise it is easy to adjust to fake gold ink, losing the color that gold ink should have.
2 screen printing gold ink distribution
There are many varieties of screen printing gold ink, and the selection is large. Under normal circumstances, you can directly use the original color screen printing gold ink. When the screen printing gold ink hue needs to be fine-tuned, a small amount of ink of the desired hue can be added to the primary color screen printing gold ink, but the color selection must be appropriate. If the required ink color is lighter gold, silver ink can be added to the primary color screen printing gold ink, or white ink can be added, but the gold ink blended with white ink will give a feeling of "fake gold", so It is best not to use white ink. In addition to the above methods, gold inks of different hue can also be formulated by using gold oil and flash silver powder.
(2) Distribution of spot color inks
When performing spot color proofing or spot color printing, the ink adjuster needs to perform the spot color ink blending based on years of experience. If the mixing technique of the ink-adjusting personnel is not enough, the brightness of the adjusted ink will be incorrect or the ink will not be re-distributed until it is printed on the machine. Moreover, because the spot color ink has a large dry retreat change on the offset paper, and the variation values ​​of the spot color inks of different color systems are greatly different, it is necessary to continuously adjust on the original basis to explore the law of dry retreat, so we It is necessary to fully understand the blending technology of the spot color ink to prevent unnecessary troubles such as quality accidents, ink waste, repeated labor of workers, delay of construction period, etc. due to experience alone.
3. Use computer color matching system
After understanding the basic principles of ink blending, in order to complete the printing of products with extremely high color requirements, it is necessary to use an advanced computer color matching system to match colors to meet customer acceptance criteria. Nowadays, customers no longer judge the print quality by virtue of the naked eye, but according to the Lab standard value of a given color block or color bar, and require that the color difference range does not exceed ±1.5. The customer's acceptance requirements obviously cannot be met by the experience of the master. Instead, professional instruments must be used to measure the color blocks or color bars of the printed matter, so the dataization of the ink formulation and the automation of the ink color matching must be achieved.
Printing companies need to choose a computer color matching system that meets the product requirements according to their business characteristics. This article takes the X-Rite color matching software as an example to introduce the actual usage of the computer color matching system. Usually, companies will refine the commonly used inks, including yellow, yellow, black, green, orange, dark blue, magenta and so on. According to the experimental data, an ink having a small dry-returning change and a good stability was selected as the composition of the color-matching ink. After receiving the customer's request for the color of the color sample, first input the measured paper color into the color matching system with the X-Rite spectrophotometer, and then input the standard value into the color matching system, and the system will automatically analyze several sets of color matching schemes. According to the color scheme given by the system, the color sample is presented on the substrate by means of the colorimeter, and then the Lab value is measured and adjusted within the standard color difference range. After the result is qualified, the ink is formulated according to the obtained formula, and is used for batch proofing of actual production.
Since there is a certain gap between the printing color exhibited by the color developing device and the printing color obtained in the actual production, the ink adjusting personnel will measure the Lab value of the color block or color strip actually produced by the device, and find out the change rule and reuse it. The computer color matching system performs complementary color correction, and then it is produced on the machine. After passing the test, the color matching data is stored for later recall in mass production.
In short, when formulating inks, operators not only need to gradually explore the methods and experience of blending inks in practice, but also use advanced equipment and equipment, which not only can improve production efficiency, but also bring economic benefits to enterprises.
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