The choice of ink types available for wide format inkjets is varied each providing different Pro and Cons. This post aims to make the choice less daunting.
True solvent inks can also be referred to as ‘True, Aggressive, Hard or Strong’. True Solvents are the originals outdoor inks used for Signs, Displays and vehicle wraps. True solvent inks are cheap, versatile and offer at least a 5-year outdoor life. When used on a Plastic sign media the ink partly dissolves the surface layer before drying therefore forming a stable, permanent colour image that will be resistant to scuffs and scratches.
Eco Solvents unlike True solvents are less hazardous and kinder to printheads than true solvents. They are slightly less durable and vibrant than full solvent, although outdoor life is usually quoted as three years. Eco Solvents are used for sign, display (Indoor & Outdoor) and Vehicle Wraps. we use our Eco-Solvent machine for our budget banners, double sided banners , 1200mm and 1500mm roller banners, outdoor posters, exhibitions panels, window graphics…. the list goes on.
Mild -solvent are the middle ground between full and eco-solvent; they are cheaper and more durable then eco. They are still classified as harmful and mainly used by volume printers. They can be used for indoor/ outdoor signage and vehicle wraps.
Bio Solvent inks are derived from soybean or corn oil. It is accepted that the colours aren’t as bright and have less durability than mild solvents. Mutoh have now introduced a 50% corn mixed with conventional solvent, this enhances the durability. Bio Solvents can be used for indoor/ outdoor signage.
UV Curing (Polymerisation) inks remain liquid until exposed to ultra violet light; they cure almost instantly and form a tough/durable coloured layer with the same outdoor life as a true solvent. UV inks are mainly used to print direct to rigid materials (wood, glass, metal and foamboard) with flatbed printers. UV inks are non-hazardous once fully cured and are expensive, hard to recycle and carry a few health issue when the ink is not cured
UV Cationic are an alternative to UV inks, they cure slower than UV (polymerisation) but use less UV energy. UV Cationic has better adhesion, flexibility and abrasion than UV cured by Polymerisation.
Aqueous as the name suggests are water based ink usually found in office inkjet and high quality photo/proofing printers. These inks are far more expensive than solvent types. Aqueous inks get there colour from dye or pigment, dye are very bright but fade fast. Pigment last longer up to 100years when indoors and framed. Aqueous inks are not waterproof without lamination. They can be used for high quality posters, photographs, fine art, point-of-sale etc. we use our Aqueous printers for our Pacific banner stands, Barracuda banner stands, Roller pro banner stands, Eco banner stands , Orient banner stands, Excalibur banner stands, pop-up stands
Latex Printing Technologies developed by HP and has the potential to print on to anything, latex ink is not made from rubber it’s actually Acrylic. Latex benefits from long outdoor life, rub-resistant, brightness without the health hazard or smell of solvents.
Crystal point inks are loaded as solid sphere and are then melted to jet through the heads. The inks are not absorbed by the paper surface therefore giving them a brighter finish and with the advantage of being able to use low cost uncoated paper. Can be used on CAD and GIS printing, indoor/outdoor displays and posters.
Dye Sublimation used for Textile printing, soft signage, furnishings and garments. Dye sub inks are printed on to transfer paper. Once dry they are placed face down with the final substrate and heated via a press or roller. Dye sub won’t work on natural fibre such as wool or cotton unless given a special coating. To print direct on to flags a modified inkjet (with a catch gutter for excess ink) can be used in conjunction with a polyester fabric roll. we use dye sub printing for our zoom flags , feather flags, mini zoom flag
(Paraphrased from Simon Eccles, Digital Printer, October 2011 pg32-33).