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Low-cost screen conductive inks and ribbons developed

Sara Ver-Bruggen - 14 Sep 2011


US firm iimak, a leading supplier of thermal transfer ribbon, and other inks and imaging consumables, is expanding its range of conductive inks and ribbons.

Printing RFID label antennas, in place of etching, can reduce production costs and enable more customised applications for the technology using digital printing and imaging technologies. Image: KSWThe New York state-based company's highly conductive silver alternative screen ink, called Metallograph, is targeted at printed electronics applications, including membrane switches, flexible circuits, displays, and electroluminescent lighting.

The conductive screen inks are curable at low temperatures. Sintering is not required. The company says its conductive ink provides a cost-effective alternative to other conductive inks based on silver, an expensive metal, while performing on par with silver in terms of resistivity requirements for many applications. The ink can be used to deposit fine line features.


Thermal transfer ribbon

As well as the silver alternative Metallograph conductive inks, developed for flexographic as well as screen printing, the company has developed a conductive thermal transfer ribbon, opening up further applications for its technology.

Thermal transfer is an established digital printing technology ideal for short-run production, rapid prototyping and design. The first products from iimak, commercialised over 20 years ago, were thermal transfer ribbons for barcode applications.


Smart packaging

The Metallograph thermal transfer ribbons provide consistent conductive thickness. RFID antenna, smart packaging, electro-textiles and other printed electronics are target applications. Because sintering is not necessary, circuits are conductive immediately after printing.

Interest and demand among industrial manufacturers of electronic components and devices across many industries - including printed circuit boards, solar photovoltaics, displays and membrane switches - is increasing for more economical and efficient alternatives to conventional conductive inks, and circuit fabrication and patterning processes.

New lower-cost conductive inks and consumables can also benefit the fledgling smart packaging and related industries, where manufacturers are looking to commercialise concepts but need to maintain minimal production costs.

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