source:Industry News release time:2022-06-22 Article author:yu Popular:pcb
Ink is an indispensable raw material for HDI circuit board/blind via board/buried via board, which mainly plays the role of protecting the circuit board, protecting the copper skin from oxidation, insulation and so on. Whether the quality of HDI circuit board/blind orifice/buried orifice ink is excellent is reflected in its own viscosity. The English is: viscosity, that is, the shear stress of the flow divided by the velocity gradient in the direction of the flow layer, and the unit is Pa/sec.
Plasticity: refers to the performance of the ink to maintain the previous shape after being subjected to external force, and the plasticity can improve the printing accuracy of the ink.
Thixotropy: The ink is gel-like when there is no external force, and turns into another shape after being stressed.
Drying: The slower the ink dries, the better, but the faster the ink is transferred to the substrate, the better.
Hiding power: For HDI circuit board/blind via board/buried via board ink, high hiding power is required according to special purposes and requirements.
Viscoelasticity: It refers to the ability of the ink to rebound quickly after being cut off after squeegee printing. The better the resilience of the ink, the better the printing.
Fluidity: fluidity is the flow of ink to the surrounding under the condition of external force, especially gravity. It is the reciprocal of viscosity. The greater the plasticity and thixotropy, the greater the fluidity.
Lass: When the ink is scooped up with an ink shovel, it will appear as a filament that does not break and become a wire drawing. The longer the wire drawing, there will be many filaments on the HDI circuit board, which cannot be printed.
The ink should be resistant to external scratches, thermal shock, mechanical peeling, etc. after use. And it must meet the international safety performance and environmental protection performance.
Commonly used ink colors for HDI circuit boards:
The most common ink color is generally green, and HDI circuit boards/blind via boards/buried via boards generally require photosensitive/matte green ink. Some other common colors are: black, white, yellow, red, blue, etc.
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