epson ink cartridge

Whatever technology is applied to printer hardware, the final product consists of ink on paper, so these two elements are vitally important when it comes to producing quality results. The quality of output from inkjet printers ranges from poor, with dull colors and visible banding, to excellent, near-photographic quality.

Two entirely different types of ink are used in inkjet printers: one is slow and penetrating and takes about ten seconds to dry, and the other is fast-drying ink which dries at about 100 times this speed. The former is generally better suited to straightforward monochrome printing, while the latter is used for color. With color printing, because different inks are mixed, they need to dry as quickly as possible to avoid blurring. If slow-drying ink is used for color printing, the colors tend to bleed into one another before they’ve dried.

Epson ink cartridge  - Epson inkjet cartridge


The ink used in inkjet technology is water-based and this poses other problems. The results from some of the earlier inkjet printers were prone to smudging and running, but over the past few years there have been enormous improvements in ink chemistry. Oil-based ink is not really a solution to the problem because it would impose a far higher maintenance cost on the hardware. Printer manufacturers are making continual progress in the development of water-resistant inks, but the results from inkjet printers are still weak compared to lasers.

One of the major goals of inkjet manufacturers is to develop the ability to print on almost any media. The secret to this is ink chemistry, and most inkjet manufacturers will jealously protect their own formulas. Companies like Hewlett-Packard, Canon and Epson invest large sums of money in research to make continual advancements in ink pigments, qualities of lightfastness and waterfastness, and suitability for printing on a wide variety of media.

Today's inkjets use dyes, based on small molecules (<50nm), for the cyan, magenta and yellow inks. These have high brilliance and wide color gamut, but aren't light-fast or water-fast enough. Pigments, based on bigger (50 to 100nm) molecules, are more waterproof and fade-resistant, but can't yet deliver the range of colors that dyes do and aren't transparent. This means that pigments are currently only used for the black ink. Future developments will concentrate on creating water-fast and light-fast CMY inks based on smaller pigment-type molecules. 

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