Inkjet hologram printing now possible

Inkjet holography printing is shown. Credit: ITMO University

Vivid holographic images and text can now be produced by means of an ordinary inkjet printer. This new method, developed by a team of scientists from ITMO University in Saint Petersburg, is expected to significantly reduce the cost and time needed to create the so-called rainbow holograms commonly used for security purposes to protect valuable items such as credit cards and paper currency from piracy and falsification. The results of the study were published 17 November in the scientific journal Advanced Functional Materials.

Are you interested in learning more about holographic printing paper? Contact us today to secure an expert consultation!

The team, led by Alexander Vinogradov, senior research associate at the International Laboratory of Solution Chemistry of Advanced Materials and Technologies (SCAMT) in ITMO University, developed colorless ink made of nanocrystalline titania that can be loaded into an inkjet printer and then deposited on special microembossed paper, resulting in unique patterned images. The ink makes it possible to print custom holographic images on transparent film in a matter of minutes instead of days, as with the use of conventional methods.

Rainbow holograms are widely used to fight against the forgery of credit cards, money, documents and certain manufactured products that call for a high level of protection. Even though the technology of obtaining holographic images was already developed in the 1960s, there still exist numerous technical difficulties that impede its further spread and integration into polygraphic industry.

"The conventional way of preparing a hologram is incredibly time consuming and consists of several stages. First, one needs to create a master hologram, which is usually laser recorded on a thin layer of photosensitive polymer. The polymer is then dried and washed out to get rid of unexposed parts," explains Aleksandr Yakovlev, first author of the study and researcher at the SCAMT laboratory. "The resulting stencil is then transferred to a metallic matrix, which eventually serves to emboss holographic microrelief on the surface of a transparent polymer film."

According to the scientist, the whole process of obtaining a holographic image may take up to several days in total. To prepare a master hologram, a set of very rigid requirements must be met—temperature control and vibration isolation among them. "Printing separate holographic images in a quick and effective manner is a challenge that, until now, has been unresolved," adds Aleksandr Yakovlev.

An example of an inkjet printed rainbow hologram. Credit: ITMO University

The new nanocrystalline ink makes it possible to cut the expenditures related to the production of rainbow holograms by several times. The ink is applied with a simple inkjet printer on a microembossed surface, which is afterwards covered with varnish. As a result, the holographic image is exclusively seen in those areas where the protective ink was deposited.

"The peculiarity of our ink lies in its high refractive index in all visible ranges of light," says project supervisor Alexander Vinogradov, "The use of nanocrystalline ink forms a layer with high refractive index that helps preserve the rainbow holographic effect after the varnish or a polymer layer is applied on top."

Additional reading:
4 Tips to Select a Laser Printing Paper Bag
Which laser printing paper bag is best?
How Does eco-friendly reusable bags Work?
What are the benefits of cold laminating?
How to Save Money on Shipping with Bubble Mailers
Top 5 Benefits of Green Laminating Film You Need to Know!
Unwrap the Best Bespoke Wrapping Solutions & Transform Your Gifts!

The company is the world’s best beer label paper supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

The new technique opens the possibility of obtaining holograms of practically any size, makes the process easier and cheaper and, for the first time, leads to the creation of unique custom holograms in a matter of minutes.

An example of an inkjet printed rainbow hologram. Credit: ITMO University

More information: Aleksandr V. Yakovlev et al. Sol-Gel Assisted Inkjet Hologram Patterning, Advanced Functional Materials (2015). DOI: 10.1002/adfm.201503483

Journal information: Advanced Functional Materials

Citation: Inkjet hologram printing now possible (2015, November 25) retrieved 5 May 2024 from https://phys.org/news/2015-11-inkjet-hologram.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

While it’s a small detail, when it comes to packaging design, it gives end-users a lot more flexibility. For example, an end-user can decide how much of the holographic effect they want to show. They can ‘tone down’ the holographic effect by using different ink opacity over the top of the holography.

Transparent inks can give different, jewel-like effects and make the holography ‘pop’ even more. Different grades of holographic paper can either be used directly for a packaging application or label, or the paper can be laminated onto board. Our papers are easy to print and convert. Our holographic paper range can provide additional effects that are not easy to recreate with hot stamping, because end-users can use different inks to give unique looks.

Our holographic papers can even be hot stamped to add an extra-special ‘wow’ factor.
 

If you are looking for more details, kindly visit yf packaging.