The determination of cheese resistance and oil resistance of oil strength is also based on their application purpose. Because some printed materials are used to package foods such as dairy products or fats.
For engraving gravure ink, the oil resistance (bleeding) of the ink is determined because the print of this kind of print is relatively thick, and the edge of the print may ooze oil. If the ink (actually a problem with the pigment) is not oil resistant, then The oozing oil stain may be colored, so that the value of the printed matter is gone.
Measurements were also made with ink drawdowns after drying at room temperature.
If the resistance to solid substances such as cheese is determined, the method of measuring soap resistance can be used.
If liquid substances such as oil are measured, the immersion method can be used .
Generally, the ink scraping sample can be pasted on a solid substance or soaked in a liquid substance.
After 72 hours, take out and observe the discoloration of the ink scraping sample and the dyeing degree of the test material. Then rate it. But in the actual measurement, as long as the test material is dyed with color, it means that the resistance of the ink is poor.
The determination of oil seepage resistance is relatively simple. Generally, it is only necessary to place a drop of ink on the qualitative filter paper. After 72 hours, observe whether there is color in the oil circle where the ink drop oozes out. In order to speed up the determination, a small amount of paraffin oil can also be added to the ink.