One sure sign that printed electronics and RFID opportunities are growing is that more colleges and universities are supporting the high-tech fields. Cal Poly, for example, plans to add a new master's program in printed electronics in 2013, which would mark the renowned institution's first...
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Incidentally, Keif was selected as the Print and Graphics Scholarship Foundation's 2004 Educator of the Year. So, I asked the educator to educate me and MPR readers some more about printed electronics, which he defined as conductive devices that are manufactured using solution processing (ink) and a flexible substrate (usually plastic, but could be paper). "The printing is additive, as opposed to subtractive [etching]," the professor said, "and may use screen printing, gravure, flexography, inkjet, offset lithography, or a host of other less common graphic printing and coating methods. In additional to printed electronics, there are also other non-conductive functional applications in this space, including barriers, dielectrics, sensors, etc."
I also asked professor Keif a few other questions relating to printed electronics:
MPR: I've heard of electrochromic and electroluminescence technologies. What are they, and how do they differ?
Keif: Electrochromic (EC) is a reflective technology where inks change color. They are similar to thermochromic inks (in appearance, not composition) except the color change is initiated when a small voltage is applied, whereas thermochromic inks change with temperature change. (Editor's note: See last September's "How'd They Print That?") Electrochromic inks can be stimulated with a relatively small battery.
Electroluminescent (EL) is an emissive technology (not reflective), so it is like a back-lit sign. ELs are much more power hungry and require an AC field for the phosphorescing to work. Therefore, it is suited for stationary items like point of purchase displays, whereas ECs can go where ever a small battery can go.
We have printed both ECs and ELs via screen printing, though it is likely possible they can be printed in other ways.
MPR: What are some common applications of the above?
Keif: ECs are used for small items like secure ID cards or credit cards. ELs are used for signage, POP, etc.
MPR: Would you consider printed electronics a specialty service, or is it something that the average commercial printer could delve into if they chose to invest in the resources?
Keif: The average commercial printer could develop expertise in this area, but it takes a large commitment, as it is difficult and requires a lot of research at the moment. Further, offset hasn't advanced well because of the two-fluid system. Since these inks are in their infancy, no one has a system (that I know of) that can work with fountain solution, and the other rheological properties of offset inks. Further, the ink film thickness of offset may be too thin for many applications. Most of the work has been with screen, gravure, flexo, and inkjet.
This past December, UPM-Kymmene announced that it wants to sell its radio-frequency identification business to Dutch firm SMARTRAC, a global market leader in high-quality RFID inlays for electronic passports and contactless credit cards as well as for RFID transponders for public transport applications. Seeing value potential in the new combination, the Finnish paper-making parent company will become an indirect shareholder with a 10.6 percent economic interest. (The deal, which is subject to regulatory approvals, is expected to close during Q1 2012.)
"UPM has been developing and investing in its RFID inlay business for a number of years. The business unit has evolved from a small venture to a sizeable business and is now recognized as the market leader in its field," said Jussi Vanhanen, president of engineered materials for UPM. "Combining the business unit with a company with the industry's widest RFID business portfolio, we give it new leverage to continue to develop successfully."
"The transaction will ... furnish us with favorable additional manufacturing capacities in strategically important markets," added Christian Fischer, PhD, CEO of SMARTRAC.
Security Packaging Wins Award
Vorbeck Materials and MeadWestvaco (MWV) have received the Product Development Award in Printed Electronics from IDTechEx for MWV’s Natralock with Siren technology, an anti-theft packaging solution.
The security-smart packaging solution incorporates Vorbeck’s graphene-based conductive ink technology to enable an on-package alarm to protect the product from theft or tampering before purchase. “We are honored to be recognized for our work in developing real-world products using our revolutionary Vor-x graphene technology,” said CEO John Lettow. “We have been extremely privileged to work with MWV, a leader in leveraging new technology to develop innovative and impactful packaging solutions.”
The design of Natralock with Siren Technology offers significant advantages over existing security-packaging devices. Embedded technology within the package itself allows for exceptional security without interfering with product branding or deterring sales by requiring products to be placed behind a locked cabinet.
Natralock with Siren technology packaging uses an on-package alarm to provide three levels of security for retailers. The alarm sounds whenever a thief attempts to: