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In general, the ink manufacturer will give guidance on which substrate the ink is suitable for, but this opinion is for reference only. To choose a suitable ink, you need to understand a few things: what kind of substrate to use; whether the substrate needs pre-treatment before printing; what kind of color needs to be printed; the abrasion resistance, chemical resistance, and weather resistance of the ink. Printing requirements such as printing; and inks are recommended for drying or curing.
Once you have selected an ink that is suitable for the substrate, remember that it must be formulated according to the ink manufacturer's recommended method. A lot of ink manufacturers have provided a specification of the technical data, there are catalysts, auxiliaries and solvents that the ink can be compatible, and the correct proportion of the ink mixes and so on. Many ink formulations are formulated on a weight basis rather than on a volume basis, so it is best to weigh accurately using a digital instrument that weighs at least 0.1 g. If you want to match color, you should use an instrument that can be accurate to 0.01g, so you can avoid the waste of ink in the color matching test.
Proper mixing of the ink with the auxiliaries is the best time to dilute the ink consistency, which can be diluted with a suitable solvent or a mixture of several solvents. Standard pad printing inks usually have a variety of suitable diluting agents, including three diluting agents with fast, medium, and slow volatilization rates. Ink manufacturers generally have a range of values ​​for diluting agents. Generally, diluting agents are added at a ratio of 10 to 20% of the ink.
Deciding which type of diluting agent to use and how much diluting agent to add is a guess for most people. This is actually not true. Before the start of the printing of a batch of jobs, diluting agents should be tested. First, the printing machine's printing speed is adjusted to the required speed, and the print head pressure is adjusted to look optimal. Then it can be tested by first adding a diluting agent with a moderate volatilization rate, and adding a ratio to take the median of a recommended range of values. For example, if the recommended range is 10 to 20%, add 15% of the diluting agent. Try to print a few times so that the etched gravure is fully wetted and the print head is properly expanded. At least try to print on the substrate 12 times, and if necessary, adjust the pressure of the print head. If the printed image has quality problems, the following two steps can be used to test.
The first step is to turn off the printing press with an image printed at normal printing speed. Check the image on the print head and use a small mirror to observe the image under the print head. Check that the image on the print head is complete and that the image is in the correct position. If there is no problem with the image on the print head, continue to the second step. (Note: If the part of the image on the print head is missing, or the edges of the image appear to be jagged, generally speaking, the ink is too thick. Add a certain amount of diluting agent, repeat this work until it can be on the print head Obtain an acceptable image; adjust the position of the print head if it is found that the position of the image on the print head is not where it should be.)
Step 2: If there is no problem with the image on the print head, then the image is printed onto the substrate at the normal operating speed. If the print quality is OK, you can start the formal printing production; if the printed image looks a bit dirty, transparent, or fuzzy, and the ink is also attached to the print head, indicating that the ink is too thin. Can add a small amount of ink, can also reduce the printing speed.
In the process of controlling the ink performance, it should be noted that the temperature and relative humidity have a great influence on the ink performance. The higher the temperature, the faster the solvent volatilizes and the faster the ink becomes sticky. However, the two extremes of relative humidity (very high humidity and very low humidity) are not the case. The two extremes of relative humidity are a headache for printers when controlling ink performance on the press. Humidity exceeding 80 to 85% causes the ink to become sticky at a slow rate, and humidity below 15 to 20% also makes the ink sticky at a slow rate. However, when the environment is at two extremes, simply controlling the characteristics of the ink solvent is basically incapable of improving the viscosity of the ink.
For some frequently reprinted jobs, one method can be used to speed up the process of ink formulation. This method is called the ink transfer matrix method. If each batch of printed job is printed with the same print speed, a chart can be used to record the temperature and humidity of each batch of print jobs, with temperature as one axis and relative humidity as the other axis. The ratio of the diluting agent required to print an acceptable print quality is added at the intersection of the two directions. After collecting enough data over a period of time, you can look directly at Table 1 (see next page) without experimenting again.
At the beginning, you may feel that it takes too much time to collect and record this information. In fact, after a while you will find that this method saves a lot more time than collecting data. And, with this form will make the ink mix easier.
Printing ink and printing quality (c)
3 Pad Printing Ink Dispensing