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Printing Process Replaces Emulsion Screens
December 31, 1969 |Estimated reading time: Less than a minute
A method for component and ink printing industries, including multilayer chip capacitor (MLCC) or low-temperature co-fired ceramic (LTCC) manufacturers, was developed by Stork Veco, a Netherlands-based electroforming and photoetching company.
Traditional emulsion screens can cause issues such as inconsistent printing, limited precision, or short screen life. The VecoDual stencil is created from pure hard nickel using a two-layer electroforming process. The alignment of the two layers is concise, and custom-made for the stencil (Figure 1). Emulsion screens are said to enable a random alignment of mesh and product definition. This allows for uniformity and small print definition. The custom-designed grid layer of a VecoDual stencil reportedly results in 100% controlled open area over all patterns, creating uniform and reproducible printing for all details.
The screen is an electroformed stencil made up of two layers: a top "grid" layer on the squeegee side that allows the printing medium to penetrate, and a bottom "product" layer that defines the final print pattern. Stencil thickness ranges from 5–35 µm, and line or spot dimensions down to 50 µm can also be printed.