Device Packaging 2019

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Flexible PET Substrate for Higher Definition Printing of Polymer Thick Film Conductive Pastes
Keywords: Flexible PET, Higher Definition, Conductive Printing
A major obstacle in screen printing of conductive low temperature curing polymer thick film (PTF) pastes onto common flexible PET substrate materials is the substantial spread of the pastes beyond the designed line width after printing. Industry observation and controlled testing have shown this spread can be as much as 80% over the circuit design's intended line width. This phenomenon prevents designers from increasing circuit density and/or reducing circuit real estate without incorporating other, more involved and higher cost patterning methods. In many cases, flexible circuit fabricators desiring more accurate high definition circuit elements may have to subcontract parts out of house in order to incorporate alternate patterning methods. In-turn this subcontracting leads to a loss of control of both cost and lead time. This presentation will provide results of numerous in-house and field testing, comparing printed line width control, edge definition, and improved conductivity of printed polymer Ag conductors on different flexible PET substrates from testing performed on various PET substrates.
Art Dobie, Technical Representative
Ikonics/Chromaline
Mount Holly, New Jersey
United States


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