From the birth of plastic banknotes until now, legal plastic banknotes issued by countries around the world have used the following two materials as the printing carrier of plastic banknotes:

①Tyvek substrate

Registered trademark of DuPont Company of the United States. Compared with banknotes, it has the following characteristics: thin, light weight, not easily deformed, soft and smooth, tough, tear-resistant, opaque, moisture-proof, water-stain resistant, small surface friction, high elasticity, suitable for most inks Says it takes longer to dry. In view of the above characteristics, the United States has only issued small-denomination experimental banknotes in seven countries and regions: Costa Rica, Haiti, Honduras, Ecuador, El Salvador, the Isle of Man, and Venezuela, but in the end it was difficult to achieve success.

②Guardian substrate

A registered trademark of Australian Security Company. Securency, located in Melbourne, Australia, is a world-recognized leader in anti-counterfeiting plastic banknotes and anti-counterfeiting plastic document substrate technologies. The Guardian substrate registered and produced by this company is specially used for printing plastic banknotes. It has been widely used in plastic banknotes in more than 33 countries and regions in the world. It is the only banknote base for plastic banknotes in the world today and is also the main plastic banknote today. definition.

Guardian substrate was successfully developed by CSIRO, Australia’s major scientific research institution, after spending a lot of money and time. Since the Guardian substrate itself does not absorb ink and cannot be printed directly on it, Australia has specially developed a white paint. When printing banknotes, first apply white paint back and forth 5 times on both sides of the substrate. Since the white paint can absorb ink, after it dries, the substrate can be printed in a general banknote printing factory. In order to leave an anti-counterfeiting transparent window, a small area must be covered when painting, so that the covered area will not stick to white paint and remain transparent. Because the texture of the Guardian substrate is close to banknote paper, it is fiber-free, non-porous, anti-static, anti-oil, and anti-copying. Therefore, it is difficult for criminals who counterfeit counterfeit currency to imitate similar plastic substrates. The Guardian substrate itself is an effective anti-counterfeiting measure. Since this technology is patented by Australia, other countries will have to pay a high price if they want to print plastic banknotes.