TANAKA develops a low temperature nano-silver sintering paste for screen printing


– Enable fine wire printing at 30 microns and below, with the potential to further improve transparency and flexibility for electronic devices such as next-generation automotive window screens and defoggers –

TOKYO, October 15, 2021 / PRNewswire / – TANAKA Kikinzoku Kogyo KK, which operates the TANAKA precious metals manufacturing business under the wing of TANAKA Holdings Co., Ltd., announced on October 15 that TANAKA has developed a low temperature nano-silver sintering paste for printed wiring (https://tanaka-preciousmetals.com/en/products/detail/sintering-agpaste-for-print/) optimized for screen printing (* 1) and samples are currently available.

This product can miniaturize and improve the flexural strength of wiring for use in screen printing, which is a common printing method used in the field of printed electronics (* 2). For this reason, it should be widely used for flexible devices such as smartphones and portable devices which require bending strength and to improve the transparency of window defoggers and other products for which the demand will increase as electric vehicles will become more popular.

Nano-silver paste for screen printing:

Threads printed on foldable organic substrate:

Product Features

  • Paste suitable for printing fine threads of 30 micrometers and less

Normally the print limit of the threads in the screen printing process is about 50 microns in width. However, by combining suitable printers and displays with this paste, it is possible to print fine threads (30 micrometers and less) directly on glass, which is a difficult medium for fine line printing, and on d ‘other materials like PET film (* 3) and green foil (* 4). This will enable higher performance and improved productivity for electronic devices that require transparency, including window defoggers for next-generation vehicles and transparent antennas for 5G applications.

  • Flexural strength for printed wiring

Yarns printed on PET film and other organic pliable substrates (100 micron printed wiring) have been proven to show no breakage over 100,000 cycles when subjected to a bend test with a bend radius of 0.5. mm. This product should therefore be used for flexible devices such as smartphones and portable devices which need both flexibility and durability.

  • Low resistance of 10 microohm-cm and less

When sintered at heating temperatures of around 90 ° C, the wires have a resistance value of less than 10 microohms-cm, giving this product unusually low resistance even for sintered nanosilver paste. at low temperature.

Printing straight line patterns on glass:

Printing of the packaging pattern on a green sheet:

  • Nano-silver paste optimized for screen printing

This printing paste consists of nano and submicron silver particles suitable for screen printing, which is the printing method most commonly used in the field of printed electronics. The paste has been successfully developed to create yarns with good flexural strength and improved screen printing performance through particle size control, selection of solvents, and additives such as polymer compounds for the optimize for screen printing. Using fine wiring in screen printing, which is a general printing process, should also improve productivity.

Because of these benefits, this product is expected to contribute greatly to a range of electronic devices that will contribute to society IoT (Internet of Things), thin wire heating technologies that prevent fogging of glass (a need that is expected to increase as electric vehicles become more popular) to healthcare-related wearable devices and 5G-oriented transparent antennas that don’t compromise eyesight.

Samples of the product are already available with the aim of starting mass production before the end of 2022.


(* 1) Silkscreen:
Used in the manufacturing process of printed circuit boards, electronic components, flat panels, vehicle counters and other devices, it is an essential printing method in the field of electronics. .

(* 2) Printed electronics:
This technology, using functional inks and various printing technologies, is used in the fabrication of electronic devices on glass and polymer substrates. Used in products such as organic electroluminescent (EL) displays, wearable devices, sensors, digital signage and electronic paper, it is a promising core technology to create the IoT company.

(* 3) PET film:
Polyethylene terephthalate (PET) film is a polymeric film with exceptional heat resistance and strength. It is used to protect the surface of devices such as liquid crystal televisions, as a backlight reflective film for devices such as laptops, and as a substrate for portable devices.

(* 4) Green leaves:
These ceramic substrates, in the flexible uncured state, are used for printed circuits.

About TANAKA Precious Metals

Since its founding in 1885, TANAKA Precious Metals has built a diverse line of business activities focused on precious metals. TANAKA is a leader in Japan concerning the volume of precious metals processed. Over many years, TANAKA has not only manufactured and sold precious metal products for industry, but also supplied precious metals in forms such as jewelry and assets. As specialists in precious metals, all Group companies in Japan and all over the world, collaborate and cooperate on manufacturing, sales and technology development to offer a range of products and services. With 5,193 employees, the group’s consolidated turnover for the financial year ended March 31, 2021, were 1,425.6 billion yen.

– Global industrial company website

SOURCE TANAKA Holdings Co., Ltd. ; Precious metals TANAKA

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