label: PCB ink,printed circuit board,PCB production
PCB refers to the ink (Printed circuit board, referred to as PCB) used in an ink. In the printed circuit board manufacturing process, screen printing is one of the important processes indispensable. To obtain an image of fidelity replication requires ink must be of excellent quality. PCB ink formulation depends on whether the quality is excellent science, advanced and environmentally friendly. It embodied in:
A kinematic viscosity Viscosity is short. Said viscosity is generally used, i.e. the shear stress divided by the fluid flow direction, the flow velocity gradient layer, international units Pa / sec (Pa. S) or mPa / s. PCB production means in the ink generated by the external force mobility.
Viscosity conversion between units:
1Pa. S = 10P = 1000mPa. S = 1000CP = 10dpa.s
2 plasticity refers to the deformation of the ink by the external force, remains the nature of the deformation front. Help to improve the plasticity of ink printing precision;
3 thixotropic (thixotropic) standing gel ink, while the viscosity occurs when a property changes being touched, also known as thixotropy, sag resistance;
4 Liquidity (leveling) ink in the external force, expanded to the surrounding degree. Fluidity is the reciprocal of viscosity, fluidity and thixotropy of the ink on plastic. Plastic and thixotropic big, big mobility; mobility of the imprinted easily expanded. Mobility of small, prone webs, resulting knot Mexican phenomenon, also known as textured;
5 viscoelastic means scraper scraping ink after printing, ink is shear fracture rapid rebound performance. Requirements deformation speed ink, ink rebound quickly and be conducive to printing;
6 After drying ink on the screen requires dry slower the better, but I hope the ink is transferred to the substrate, it is required sooner the better;
7 and the fineness of the pigment particle size of the solid material, PCB ink is generally less than 10μm, the size should be less than the fineness of the mesh opening of the third;
8 of the drawing with ink spatula to stir the ink, the ink filaments called the degree of stretching without breaking stringiness. Ink silk long filaments in a lot of ink and the printing surface face, so stick substrates and dirty plates, not even printing;
9 ink transparency and opacity
For PCB ink, depending on the purpose and requirements of transparency and opacity inks also made various demands. Generally, the line ink, conductive inks and ink characters, are required to have a high hiding power. The solder resist is more flexible.
The chemical resistance of the ink 10
PCB ink according to the purpose of the different requirements of the corresponding acids, bases, salts and solvents and other requirements are stringent standards;
Physical properties of the ink resistant to 11
PCB ink must comply with external scratch resistant, thermal shock, mechanical stripping, and achieve a variety of stringent electrical performance requirements;
12 safe and environmentally friendly inks
PCB ink requirements have low toxicity, odorless, safe and environmentally friendly.
Source://www.seekic.com
