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PCB screen printing inks

by: Feb 10,2014 1996 Views 0 Comments Posted in Engineering Technical

PCB ink PCB ink quality PCB

In principle, from the combination of the above may be several components. Excellent quality glass paint, PCB ink quality is excellent. Scientific, advanced and comprehensive reflection of environmentally friendly formulations. Embodied in a

I.e. the shear stress divided by the fluid flow direction, the flow velocity gradient layer, the viscosity is the dynamic viscosity (dynamicviscos short. Viscos represented by general international units of Pa / s (PaS or mPa / s (mPaSPCB ink is produced by the production external force mobility occurred.

Viscosity conversion between units:

1PaS = 10P = 1000mPaS = 1000CP = 10dpa.s

Insisted the nature of the deformation front. Help to improve the plasticity of ink printing accuracy plasticity refers to the ink deformed by external force.

The viscosity occurs when a property changes subject to vibration, thixotropic (thixotrop standing gel ink, also known as thixotropy, sag resistance.;

Expanded to the surrounding level. Fluidity is the reciprocal of viscosity, fluidity (leveling) of the ink in the external force. The fluidity of the ink on plastic and thixotropic. And thixotropy large mobility is large; mobility blot easily expanded. Mobility of small webs prone to occur knot Mexican phenomenon, also known as textured;

Shear fracture ink was quickly rebound performance. Requirements ink deformation speed, viscoelastic means scraper scraping ink after printing. Ink rebound quickly in favor of printing abilities;

And I hope after the ink is transferred to the substrate, drying ink drying requirements in the Web version of the slower the better. Requires the sooner the better;

PCB ink is generally less than 10μm size should be less than the fineness of the mesh opening size of the third and the fineness of the pigment particles in the solid material. ;

Filamentous ink drawing does not break resistance level is called drawing. Long silk ink, drawing ink shovel of ink when provoked. Ink and printing surface face a lot of filaments, so that the substrate and the printed version of the stick dirty, not even printing;

Transparency and opacity inks

Depending on the application and requirements, the PCB ink. Transparency and opacity of the ink 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

Corresponding requirements for acids, bases, salts and solvents have strict requirements specification PCB ink according to the purpose is different. ;

The physical properties of the ink-resistant

And achieve a variety of stringent electrical performance requirements necessary to meet the PCB ink external scratch resistant, thermal shock, mechanical stripping. ;

Use ink peace and environmental protection

PCB glass paint requirements have low toxicity, odorless, safe and environmentally friendly.

Which in actual operation screen printing, more than I have summed up the basic properties of twelve PCB ink. Viscosity problems closely related to the operator. Low viscosity for screen printing smoothly or not, the relationship is great. Therefore, technical papers and inks QC PCB speech, viscosity too clearly marked to indicate under what conditions, what type of viscosity measurement instruments.

If the ink viscosity is high, the actual printing process. Will cause difficulties were missing, graphics jagged edges serious, in order to improve the printing effect, will join thinner, the viscosity meet the requirements. But difficult to find in many cases, to want to get a good resolution (resolving power) no matter what you use viscosity have never been able to achieve. ? Why, after in-depth study was, only to find that the ink viscosity is an important factor, but not the only important factor there is another considerable - thixotropic. Also affecting the printing accuracy.

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