In the printing process, how to make a batch of printed products or several batches of printed composite packaging bags to maintain the consistency of hue is the most basic requirement, but also an important problem. The consistency of hue can only be said to be relative. Absolute hue consistency is impossible. Especially when there are many times of printing, this batch and the other batch may be far from the possible hue. Let's talk about how to control the hue to the maximum consistency.
1. Ink
It is required that there is no deviation in the hue of the ink. First, it is best to use the same batch of ink. Because of different batches of ink, although some colors have little change, but some have changes, this requires a good check on the supply of raw materials. The consistency of the ink hue is the most basic requirement and an important condition. If the ink hue deviation is too large, it is difficult to control the consistency of the hue through other methods. When several colors are stacked together or the upper ink layer is thick, the hue The difference is obvious.
Secondly, it requires that the amount of ink added to the ink tray be less every time to keep adding new ink frequently, especially some patterns with less ink. If too much ink is added at one time, the ink will be used for a long time without new ink being added. The hue will change. For example, black ink that has been used for a long time is gray, and it is not as pure as new ink. Red ink that has been used for a long time will become dark red and not as bright as new ink.
The third is to require the viscosity of the ink to remain consistent from beginning to end, preferably with a viscosity controller.
2. Scraper
The position of the blade contacting the printing plate has a great influence on the color, especially the hue of the light texture, so it is required that the blade is basically in the same position from beginning to end.
The pressure of the doctor blade has little effect on the hue and can be changed within a certain range. However, if the change is too large, it also has an effect, especially for the printing of light texture.
3. Printing plate
The influence of the printing plate on the hue is mainly manifested in:
â‘ , block version. At this time, the amount of ink transfer is reduced, thereby affecting the hue. Therefore, it is necessary to clean the printing plate with decontamination powder to make it print in a normal state.
â‘¡ The wear of the printing plate. When the printing quantity of the printing plate is large, as the degree of wear increases, its hue will change, and overall it will become lighter. In order to solve this problem, if the printing batch is large, and the varieties that are often printed, you can dilute the ink in the new version, and then gradually reduce the degree of diluting as the amount of printing increases, until it is no longer dilute.
The change of hue is mainly related to the above problems, but it is also closely related to proofing and signing. It can be said that the problem of signing samples cannot be solved, and the hue control is simply inadequate. Many printing plants print a sample first, and then let the customer confirm the effect and then officially print. It is very critical when printing samples, it directly affects whether the hue can be controlled well. To sum up in one sentence: when printing samples, it should be carried out in a normal printing state, and it cannot be printed in an abnormal state in order to pursue a certain hue. The normal printing status includes the following aspects:
The viscosity of the ink should be appropriate. Excessive viscosity is not conducive to the transfer of the ink, and it is easy to produce paste plates, especially black ink. If the print is confirmed in the state of high viscosity, it is impossible to print for a long time. It will definitely confuse the page and make the printed product scrapped. If the viscosity is too small, static phenomenon is easy to occur, which is not conducive to hue control.
The ink is preferably a mixture of old and new. If the printing time used is too long, it is difficult to keep the hue consistent with the ink proof that the hue has changed. The reason is simple, because without these same inks, only new ink is added, and the hue of the new ink is different from the hue of the original ink.
The scraper should be in proper contact with the printing plate. If the printing is performed at a distance between the position where the blade contacts the printing plate and the position where the rubber roller contacts the printing plate, during the official printing, it is difficult to transfer the ink on the film in some places with shallow texture. There will be flower spots on the product. When shortening the distance and trying to clear these flower spots, the hue will definitely change. Of course, if it is a solid printing, there is basically no such problem.
Hue control is mostly to control the mixing effect of multiple colors, the above is for a color change. In the specific operation, it is necessary to accurately determine which color has changed so that the hue of the mixture has changed. This is a premise. If it is a judgment error, it is impossible to bring the hue to the correct direction. Combined with the above operations, it is possible to obtain a more satisfactory degree of hue control.
Ceramic Ionic Hair Straightener Brush has an impressive twelve temperature settings, giving you maximum customization for your hair straightening. It features an eight foot power cord with a swivel joiner that will allow you to rotate the brush 360-degrees. It also has a hanging hook that will allow you to store it out of the way, yet readily accessible at all times.
Straightening Brush,Best Straightening Brush,Ceramic Straightening Brush,Heated Straightening Brush
Ningbo Meirou Electric Appliance Co.,Ltd. , https://www.mrhairdryer.com