Due to the wide range of screen printing applications, the requirements for screen printing inks are also stricter. Therefore, in order to meet the different requirements of printing products for inks, the following aspects of screen printing inks should be tested:
1 Adhesion
After testing to determine the degree of ink adhesion on different materials.
2 Flexibility The fastness of adhesion of the ink to the substrate material is checked by the resistance test.
3) Resistance to rubbing and rubbing The rubbing resistance is mainly performed on the printing surface of materials such as cloth, paper and film to test the degree of adhesion and firmness of the ink to the printed material.
4 abrasion resistance
After the cotton printing surface is exposed to sunlight, the cotton cloth is rubbed for a certain number of times to check the degree of contamination of the cotton cloth.
5 weather resistance
Weather resistance also contains light resistance. Weather resistance is usually placed outside the print, the wind and sun, rain and other tests to test the printed pigment discoloration, bleaching degree and decomposition of the printing ink film, discoloration and so on.
6 heat resistance, cold resistance
Because some prints are used at different temperatures. Therefore, some prints are processed by high temperature after printing, and some prints are subjected to low temperature processing after printing. Through the heat resistance and cold resistance test to test the ink at different temperatures.
7 hot water resistance
Hot water resistance test is usually on the printing surface per unit area, adding a certain amount of warm water for a certain period of time to test the degree of contamination of water. In particular, the extent to which the pigment in the ink is soluble in water is observed to determine whether the ink is suitable for the printing of food utensils and toys.
8 oil resistance
Oil resistance refers to the suitability of oils and fats, mechanical oils, etc. This is different from solvent resistance.