[China Glass Net] There are occasional bubbles in the ink on the substrate after printing. The main reasons for the bubble are as follows.
1 The surface of the substrate is covered with dust and oil stains.
2 The ink itself has bubbles or uneven viscosity during printing.
3 printing speed is too fast or printing speed is not uniform.
The intrinsic factor of bubble generation is that due to the high viscosity of the ink, the surface tension of the ink is large, and the gas oil in the ink is difficult to escape from the ink film and stay in the ink layer. If the ink viscosity is low and the surface tension of the ink is small, the bubbles will disappear by themselves, and thus there will be no phenomenon that the ink in the printed ink bubbles.
The following measures can generally be taken to prevent the ink layer from generating bubbles.
1 Try to use a hydrophobic solvent.
2 When the ink itself generates bubbles, an appropriate amount of antifoaming agent and a layer may be added to the ink. If the ink is poor in fluidity, when the screen plate is lifted, the ink flow is relatively small, and the screen trace cannot be filled, and the ink layer having a smooth surface is not obtained.
In order to prevent the appearance of screen marks after printing. The following methods can be employed.
1 Use a more fluid ink for printing.
2 It is conceivable to use ink printing with a slow drying speed to increase the ink flow time so that the ink is progressively cured.
3 When using the plate, try to use a single-diameter wire with a thin wire diameter.
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