Tanaka Kikinzoku Kogyo developed a “low-temperature co-fired nano silver paste” for screen printing

Achieved fine Circuit printing below 30?

Glass heaters for Display devices, next-generation cars, etc.

It can be expected to improve the penetration of Electronic devices and further realize flexibility

Tanaka Kikinzoku Kogyo Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo, CEO: Koichiro Tanaka), which manages the manufacturing business of the Tanaka Kikinzoku Group, announced that it has developed a “Low Temperature Co-fired Nano for Printed Circuits” that is more suitable for Screen printing (*1). Silver Paste (https://tanaka.com.cn/products/detail/sintering-agpaste-for-print/)” and began to provide samples.

  

Tanaka Kikinzoku Kogyo developed a “low-temperature co-fired nano silver paste” for screen printing

Tanaka Kikinzoku Kogyo developed a “low-temperature co-fired nano silver paste” for screen printing

This product realizes the miniaturization of wiring in screen printing, which is the mainstream process in the field of printed electronics (*2), and wiring with better bending resistance than before. Therefore, it can be expected to be applied to flexible devices such as smartphones and wearable devices that require a certain degree of bending resistance, and to improve the penetration of glass heaters, which are expected to further increase the demand with the popularization of electric vehicles.

<The advantages of this product>

■Paste material suitable for fine printing under 30?

?Usually in screen printing, a line width of about 50? is considered to be the limit of printing, but by combining a printer and a screen to which this paste material is applied, it can be used not only ON the glass that is considered to be difficult to print fine lines. , It is also possible to directly print fine wiring (below 30?) on other substrates such as PET film (※3) and green sheet (※4). Therefore, it contributes to higher performance and improved productivity of Electronic devices that require penetration, such as glass heaters for next-generation cars and transparent antennas for 5G.

■Flexural resistance of printed circuit

? Wiring printed on flexible organic substrates such as PET film (printed line width 100?), in a bending test with a bending radius of 0.5mm, proved that it will not break even after 100,000 bends, and it is expected to be applicable For flexible devices such as smart phones and wearable devices that require flexibility and durability at the same time.

■Low resistance value below 10μΩcm

In addition, in the wiring sintered at a heating temperature of about 90°C, the resistance value is lower than 10μΩcm, which is also very rare in low-temperature sintered nano-silver paste materials.

■Nano silver paste material suitable for screen printing

This product is a printing paste that uses nano- and sub-micron silver particles suitable for screen printing, which is more common in printed electronics technology. Because it is more suitable for screen printing, the screen printing performance has been improved by controlling particle size, selecting solvents, adding polymer compounds, etc., and successfully developed a wiring paste with strong bending performance. Through the use of screen-printed fine wiring using a general-purpose process, productivity can be improved.

Based on the above advantages, this product can be expected to be used in various electronic devices that contribute to the realization of an IoT society in the future, such as the spread of electric vehicles. Heating technology that prevents glass blur through fine wiring and health care is expected to increase demand. Wearable devices for 5G, transparent antennas that will not damage the landscape, etc.

This product has begun to provide samples, and plans to start mass production in 2022.

(※1) Screen printing:

It is used in the manufacturing process of printed circuit boards and electronic parts, flat panel Displays, automobile meters, etc. It is an indispensable printing process in the electronic field.

(※2) Printed electronic technology:

A technology that uses functional inks and various printing technologies to produce electronic devices on glass and polymer substrates. It can be expected to be effectively applied to organic EL displays, wearable devices, sensors, digital signage, and electronic paper as the basic technology for realizing the IoT society.

(※3) PET film:

Polyethylene terephthalate resin. It is a polymer film with excellent heat resistance and strength. It is used for surface protection of LCD TVs, reflective films for backlights of notebook computers, etc., and substrates for wearable devices.

(※4) Green film:

It refers to a ceramic substrate used as a circuit board, which is a flexible sheet in an unfired state.

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