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Toppan Forms Develops Silver Salt Ink that can be Annealed at 80℃ Taking the Technology to the Practical Level for Printing Circuits Directly on a Plastic Case for Electronic Device

November 19, 2013

Information Management Solution Provider Toppan Forms Co., Ltd. (Toppan Forms hereunder) successfully developed a silver salt ink that can print and anneal circuits at low temperature of 80℃ taking the print and annealing technology to a practical level. High conductivity performance of 6µΩ/cm can be achieved by annealing for 3 minutes at 80℃. Furthermore, annealing at a higher temperature, would make it possible to create a low resistant wiring under 3µΩ/cm , that could be printed directly on most plastic materials used in electronic devices, including polycarbonate. In combination with the technology that allows printing on curbed and bumped surfaces of three dimensional objects, wires can be formed in the area previously not possible making it optimal for mobile devices where antenna space allocation is becoming more critical due to higher performance requirements. Toppan Forms already co-developed the silver salt ink that can be annealed at 100℃ in 2009 with professor Katsuaki Suganuma of Osaka University, Industrial Science Research Center. The more recent patent pending ink and its manufacturing process are improvements in lowering the annealing temperature to 80℃.

Image of Printed Wire

Background

Mobile devices such as smartphone are becoming smaller, lighter, and high performance every year. As more features are loaded, the number of antennas would increase accordingly, requiring mobile device to be more dense and compact. Normally, flexible circuit board used as an antenna lacks in adherence to the dimensional object. Alternatively, laser beam and plating techniques on a case pre-conditioned with additives limit materials and causes issues with cost and environment. To solve these issues, Toppan Forms has been working on the development of low temperature annealing ink, and related printing and annealing technologies that allow direct print on dimensional curbs on objects.

Features

  • 1. High performance printed antenna using silver salt that anneals at low 80℃ temperature allows circuits to be printed on a wide range of case materials.
  • 2. The low circuit resistance and a thin layer allow high performance with low material volume.
  • 3. Printing antenna directly to the case increases circuit space that contributes to downsizing and weight reduction of the electronic device.
  • 4. The low resistance antenna allows high frequency applications such as GPS and Wi-fi.

Future Roadmap

Toppan Forms will continue to conduct research and development in the area of printed electronics with an aim to productize antenna for mobile device and NFC, and develop mass production technology by 2015. The company will actively form partnerships to promote the business.

Public Relations Department
General Affairs Division
TOPPAN FORMS CO., LTD.
1-7-3 Higashi Shimbashi, Minato-ku, Tokyo 105-8311, JAPAN
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