Usually, there are two factors of bubble producing in printing ink:

External factors are:

① substrate surface adhesion of dust and traces of oil and other substances.

② When the China Printing Inks itself with bubbles or viscosity uneven.

③ print speed is too fast or uneven.

Internal factors are: Due to the high viscosity of the ink, the ink surface tension, the gas oil in the ink film is difficult to escape from the ink. .

Generally can use the following measures to prevent the ink bubbles:

① try to use a hydrophobic solvent.

② produce bubbles when the ink itself, can be added to an appropriate amount of anti-foaming agent in the ink.