In the printing process, how to keep a hue consistent with a batch of prints or batches of prints is a basic requirement and an important problem. Hue's - can only be said to be relative, the absolute color consistency is impossible, especially when the number of printed times, this batch of a batch of possible hue with him is far worse. Let's talk about how to control the hue to the maximum consistency.
One, ink
It is required that the hue of the ink does not deviate. It is best to use the same batch of ink first. Because of the different batches of inks, although there are few changes in some hue, but some have changed, which requires a good supply of raw materials. The consistency of the ink hue is the most basic requirement and is also an important condition. If the hue deviation of the ink is too large, it is difficult to control the hue consistency through other methods. When several colors are stacked together or the ink layer is thick, hue The difference is obvious.
Secondly, the amount of ink added to the ink tray each time is required to be less, in order to keep adding new ink frequently, especially some patterns with less ink. If too much ink is added at a time, the ink will be used for a long time without adding new ink. The hue will change. For example, with a long black ink, it will be gray, and if it is not new, it will be black. If you use a long red ink, it will become dark red, and it will not be as bright as a new ink.
The third is to require that the viscosity of the ink be consistent from beginning to end, preferably with a viscosity controller.
Second, scraper
The position of the doctor blade in contact with the printing plate has a great influence on the hue of the hue, especially the shallow web, so that it is required that the doctor blade be substantially in the same position throughout.
The pressure of the squeegee has little effect on the hue and can be varied within a certain range. However, if the change is too large, it is also influential, especially for the printing of shallow webs.
Third, the printing plate
The effect of printing plates on hue is mainly manifested in:
1. Blocked version. The amount of ink transferred at this time is reduced, thereby affecting the hue. So clean the plate with detergent and print it in normal condition.
2, the wear of the printing plate. When the number of printing plates is large, the hue changes as the degree of wear increases, and overall it becomes lighter. To solve this problem, if the printing batch is large, and often printed varieties, you can dilute some of the ink in the new version, and then gradually reduce the degree of dilution as the print volume increases, until no longer dilute.
The changes in hue are mainly related to the above issues, but they are also closely related to proofing and signing. Can say that does not solve the problem of the sample, the control of the hue is simply inadequate, many printing companies are printing a sample first, and then let the customer confirm the effect of formal printing. When printing samples, it is very critical, it directly affects the ability to control the hue. Summarized in one sentence is that the sample should be printed under normal printing conditions, and printing in an abnormal state cannot be performed in order to pursue a certain hue. The normal printing status includes the following aspects.
The viscosity of the ink should be suitable. Excessive viscosity is not conducive to the transfer of the ink, and it is easy to produce a paste. In particular, the black ink, if it is in the state of large viscosity, it is impossible to print for a long time. Will certainly paste version, so that the printed product scrapped. When the viscosity is too small, static electricity is prone to occur, and it is also unfavorable to control the hue.
The ink is best mixed in old and new. If it is to use printing time is too long, the hue has changed ink proofing is also difficult to maintain the hue consistent. The reason is very simple, because these same inks are not added, only new inks are added, and the hue of the new ink is different from the hue of the original ink.
The position of the blade in contact with the plate should be appropriate. If the sample is printed at a distance between the position where the doctor blade touches the plate and the position where the roller contacts the plate, during the formal printing, it is difficult to transfer the film on the ink in some places with a shallow screen. There will be flowers on the product. When the distance is shortened in an attempt to clear these flowers, the hue will certainly change. Of course, if it is printed on the ground, this problem does not exist.
Most of the control of the hue is to control the mixing effect of a plurality of colors, the above is for one color change. In the specific operation, the first to accurately determine which color has changed so that the mixed hue has changed, this is the premise, if it is a mistake, it is impossible to put the hue to the correct direction, after the judgment is accurate In combination with the above operations, the hue control may be more satisfactory.
Dai Chun
One, ink
It is required that the hue of the ink does not deviate. It is best to use the same batch of ink first. Because of the different batches of inks, although there are few changes in some hue, but some have changed, which requires a good supply of raw materials. The consistency of the ink hue is the most basic requirement and is also an important condition. If the hue deviation of the ink is too large, it is difficult to control the hue consistency through other methods. When several colors are stacked together or the ink layer is thick, hue The difference is obvious.
Secondly, the amount of ink added to the ink tray each time is required to be less, in order to keep adding new ink frequently, especially some patterns with less ink. If too much ink is added at a time, the ink will be used for a long time without adding new ink. The hue will change. For example, with a long black ink, it will be gray, and if it is not new, it will be black. If you use a long red ink, it will become dark red, and it will not be as bright as a new ink.
The third is to require that the viscosity of the ink be consistent from beginning to end, preferably with a viscosity controller.
Second, scraper
The position of the doctor blade in contact with the printing plate has a great influence on the hue of the hue, especially the shallow web, so that it is required that the doctor blade be substantially in the same position throughout.
The pressure of the squeegee has little effect on the hue and can be varied within a certain range. However, if the change is too large, it is also influential, especially for the printing of shallow webs.
Third, the printing plate
The effect of printing plates on hue is mainly manifested in:
1. Blocked version. The amount of ink transferred at this time is reduced, thereby affecting the hue. So clean the plate with detergent and print it in normal condition.
2, the wear of the printing plate. When the number of printing plates is large, the hue changes as the degree of wear increases, and overall it becomes lighter. To solve this problem, if the printing batch is large, and often printed varieties, you can dilute some of the ink in the new version, and then gradually reduce the degree of dilution as the print volume increases, until no longer dilute.
The changes in hue are mainly related to the above issues, but they are also closely related to proofing and signing. Can say that does not solve the problem of the sample, the control of the hue is simply inadequate, many printing companies are printing a sample first, and then let the customer confirm the effect of formal printing. When printing samples, it is very critical, it directly affects the ability to control the hue. Summarized in one sentence is that the sample should be printed under normal printing conditions, and printing in an abnormal state cannot be performed in order to pursue a certain hue. The normal printing status includes the following aspects.
The viscosity of the ink should be suitable. Excessive viscosity is not conducive to the transfer of the ink, and it is easy to produce a paste. In particular, the black ink, if it is in the state of large viscosity, it is impossible to print for a long time. Will certainly paste version, so that the printed product scrapped. When the viscosity is too small, static electricity is prone to occur, and it is also unfavorable to control the hue.
The ink is best mixed in old and new. If it is to use printing time is too long, the hue has changed ink proofing is also difficult to maintain the hue consistent. The reason is very simple, because these same inks are not added, only new inks are added, and the hue of the new ink is different from the hue of the original ink.
The position of the blade in contact with the plate should be appropriate. If the sample is printed at a distance between the position where the doctor blade touches the plate and the position where the roller contacts the plate, during the formal printing, it is difficult to transfer the film on the ink in some places with a shallow screen. There will be flowers on the product. When the distance is shortened in an attempt to clear these flowers, the hue will certainly change. Of course, if it is printed on the ground, this problem does not exist.
Most of the control of the hue is to control the mixing effect of a plurality of colors, the above is for one color change. In the specific operation, the first to accurately determine which color has changed so that the mixed hue has changed, this is the premise, if it is a mistake, it is impossible to put the hue to the correct direction, after the judgment is accurate In combination with the above operations, the hue control may be more satisfactory.
Dai Chun
Rotary Vibrator / Drilling Hose
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