New Screen Printing Paste Consists of Nanometer and Submicron Silver Particles


Summary of the press release:

  • Offers good flexural strength and improved screen printing performance, thanks to particle size control, solvent selection and additives
  • Enables miniaturization and better wire bending resistance
  • Used for flexible devices such as smartphones and wearables

Original press release:

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

Enable fine wire printing at 30μm and less, with the potential to further improve the transparency and flexibility of electronic devices such as next-generation automotive window defoggers and displays

TANAKA Kikinzoku Kogyo KK (Headquarters: Chiyoda-ku, Tokyo; Director and CEO: Koichiro Tanaka), which operates TANAKA’s precious metal manufacturing business, today announced that TANAKA has developed a nano-silver paste low temperature sintering for printed wiring optimized for screen printing and current sample availability.

This product allows miniaturization and better resistance to bending of wiring, for use in screen printing, which is a common printing method used in the field of printed electronics. For this reason, it is expected to be widely used for flexible devices such as smartphones and handheld devices that require resistance to bending, and to improve the transparency of window defoggers and other products for which demand will increase as that electric vehicles will become more popular.

Product Features

Paste suitable for printing fine wires of 30 μm and less

Normally, the wire printing limit in the screen printing process is about 50μm in width. However, by combining suitable printers and screens with this paste, it is possible to print fine threads (30 μm and less) directly on glass, which is a difficult support for printing fine lines, and on d other materials such as PET film and green sheets. . 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.

Bending strength for printed wiring

Wires printed on PET film and other bendable organic substrates (100μm printed wiring) have been proven to show no breakage over 100,000 cycles when subjected to a bend test with a bend radius of 0.5mm. This product should therefore be used for flexible devices PRESS RELEASE Nano-Silver Paste for Screen Printing Yarns printed on a bendable organic substrate such as smartphones and wearable devices that need both flexibility and durability.

Low resistance of 10 μΩcm and less

When sintered at heating temperatures of approximately 90°C, the wires have a resistance value of less than 10 μΩcm, giving this product an unusually low resistance even for a low sintering nanosilver paste. temperature.

Nano-silver paste optimized for screen printing

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

Because of these advantages, this product is expected to contribute greatly to a range of electronic devices that will contribute to the IoT (Internet of Things) society, fine-wire heating technologies that prevent glass fogging (a need that expected to increase as electric vehicles become more popular) to health-related wearables and 5G-oriented transparent antennas that do not compromise sight.

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

  1. Screen printing: Used in the manufacturing processes of printed circuit boards, electronic components, flat panel displays, vehicle counters and other devices, it is an essential printing method in the field of electronics. ‘electronic.
  2. Printed electronics: This technology, using functional inks and various printing technologies, is used in the manufacture 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 foundation technology for building the IoT society.
  3. PET film: Polyethylene terephthalate (PET) film is a polymer 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 laptop computers, and as a substrate for portable devices.
  4. Green leaves: these ceramic substrates, in an unfired flexible state, are used for printed circuit boards

About TANAKA Precious Metals

Since its founding in 1885, TANAKA Precious Metals has built a diverse range of business activities focused on precious metals. TANAKA is a leader in Japan in terms of volumes 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 around 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 revenue for the year ended March 31, 2021 was 1,425.6 billion yen.

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