Banknote paper, as well as other sophisticated papers for passports and official documents, must have specific features to ensure security and reassure users. To achieve these two goals and to resist wear-and-tear, banknote papers have traditionally been made with cotton or other annual plants.
It could be said that banknote paper is in fact cloth, since it is not made with wood pulp and must also, for example, be able to resist accidental washing and multiple folds. Since 1990, Clextral has supplied twin-screw equipment to many customers in France (Bank of France, Arjo Wiggins) and internationally (England, Russia, China and other countries) and has established its reputation in this very demanding area of papermaking.
Long fibers annual plants, such as cotton, hemp, flax and sisal enable the production of especially robust and sophisticated papers because they provide very resistant cellulose of exceptional strength. They are therefore the prime choice to manufacture bank notes, passports and other official documents. Cotton-based papers are used for well over 95% of banknotes in the world. Twin-screw processing is ideal for making these paper pulps because it ensures consistent quality and features and can achieve the right “look-and-feel” that people expect. Also, the twin-screw process makes it easier to include watermarks, security threads or chemical tracers at the papermaking phase to make more secure banknotes that are difficult to counterfeit.
Clextral twin-screw process features
Clextral twin-screw pulp processing offers major advantages for making banknote paper:
- Very high quality papers with specific security and durability features
- Optimized pulp yield, through continuous processing
- Versatility in the use of non-wood raw materials
- Cost effective and environmentally-friendly manufacturing
- 10 to 15% reduction in energy consumption
- 10 to 30% decrease of chemicals and bleaching agents
- Reduced water consumption
- Compact turnkey installation, requiring less floor space and simplifying engineering requirements
Clextral also offers its expertise and inhouse facilities in France and the US to enable banknote papermakers to develop and test new concepts and improve processing.