PCB News - PCB circuit board ink performance and ink color

PCB circuit board ink performance and ink color

Printed circuit boards {Printed circuit boards}, also known as printed circuit boards, are providers of electrical connections for electronic components.

Printed circuit boards are often represented by "PCB", but cannot be called "PCB boards".

Ink is an indispensable raw material for PCB circuit boards. It mainly has the functions of protecting the circuit board, protecting the copper skin from oxidation, insulating and so on. Whether the quality of PCB ink is excellent is expressed in its own viscosity. The English is: viscosity, which is the velocity gradient of the flow shear stress in the direction of the flow layer, and the unit is Pa/sec.

The second is plasticity: it refers to the performance of the ink that can maintain the previous shape after being subjected to external force, and plasticity can improve the printing accuracy of the ink.

The third is thixotropy: the ink behaves like a gel when it is not subjected to external force, and then changes to another shape after being subjected to force.

The fourth is fluidity: fluidity means that the ink flows around under external force, especially gravity. It is the reciprocal of viscosity. The plasticity and thixotropy are large, and the fluidity is large.

The fifth is viscoelasticity: it refers to the ability of the ink to rebound quickly after being cut by the squeegee. The better the rebound of the ink, it can be beneficial to printing.

The sixth is dryness: the slower the ink dries, the better, and it is hoped that the faster the ink transfer to the substrate, the better.

The seventh is lacability: using an ink shovel to scoop up the ink, the unbroken filaments will become drawing. The longer the drawing, there will be many filaments on the PCB, which is difficult to print.

The eighth is hiding power: for PCB board ink according to special purpose and requirements, relatively high hiding power is required.

The ink must be resistant to external scratches, heat shock, mechanical peeling, etc. after use. At the same time, it must comply with international safety performance and environmental protection performance.

Commonly used ink colors:

The most common ink color is usually green, and the circuit board usually requires green ink. Some other commonly used colors are black, white, yellow, red, blue, and purple, which are rare.