Ink abrasion resistance (wet and dry) knowledge and test standards?

The wear resistance of ink refers to the transferability of the ink when the printed sample is subjected to external friction. When the contrast ink is rubbed, the most important is to maintain the contrast conditions, that is, the conditions of the proofing, the test conditions, and the conditions of the substrate. Consistency and stability. At present, there are no clear and unified standards and standards in the industry, and the testing conditions of various printing factories and ink manufacturers are different. In general terms, it can be divided into man-made methods and machine methods, of which the artificial method is the simplest and most crude. Here is a brief introduction.

(1) Artificial method

Dry grinding: Use a blank paper (or white cotton cloth) to cover the printed sample, press with the index finger on the sample, wipe back and forth several times (custom), observe the deinking condition of the ink, the more the ink ink falls off, The worse the abrasion resistance.

Wet Grinding: Wet a piece of cotton cloth in water, twist off excess water, wipe back and forth on the print until the substrate is exposed, the sooner the substrate is exposed, the worse the abrasion resistance.

(2) Instrument testing method

The procedure for testing the abrasion resistance of the instrument is the same as that of the manual method. Instead, the blank paper or cotton cloth is fixed on the tester. The tester provides a certain pressure contact area and the number of frictions. Therefore, the instrument test is better than the manual method. More scientific, more accurate, but need to purchase another special ink wear instrument. (Gao (Guangzhou) Coating Co., Ltd.)