Introduction

You may have already asked yourself why do printer cartridges are so expensive. A lot of people think that the manufacturers are simply overcharging us, so they go and buy a generic cartridge or even refill the same cartridge several times. What a lot of people don’t know is that there is a lot more involved in that “ink little box” than we imagine.

Besides the ink, a cartridge has more than 15 components, on average. Almost always the ink is over but these components are still new and we throw them away – including the printer head. Only in Epson printers the printer head is in the printer and not in the cartridge, which makes Epson cartridges cheaper and we don’t discard a component that is almost new. The competitors say that this is the reason why Epson printers have frequent clogging cases.

In our visit to Lexmark’s HQ in Lexington, Kentucky, USA, we saw that the cartridge price is justified by the investing made in R&D, trying to achieve better quality, durability and color fidelity on each impression.

In Inkjet Color Science Lab (Figure 1) scientists implement color processing algorithms and color reproduction tables. One of the functions is to convert RGB (red, green and blue, the primary light-colors) colors generated by the computer into CMYK (cyan, magenta, yellow and key, which means black) dots on the printed page. In this lab it is also defined the colors which will be used for each region in the world, since the color preference varies according to the region.
 
In American countries, for example, consumers prefer strong and reddish colors, in a way that portrayed people always look tanned. In Europe people prefer pale tones, as it happens in eastern cultures, but with slight different hue. A curious fact is the reaction of eastern people to pictures of American people. “In several tests we conducted, Japanese subjects looked at the pictures and said: ‘they look like drunk!’ referring to the reddish skin of the people portrayed”, said one of the scientists. “This is a very clear example that the ideal color on the picture is not close to reality but the color the consumer wants to see printed. Several times we wish a blue sky even though that doesn’t correspond to reality”, he explained.

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Figure 1: Inkjet Color Science Lab.

In Analytical Chemistry Lab (Figure 2) ink purity is researched. Using devices like plasma spectrometer it is possible to measure ink and toner components, preventing the presence of any impurity, hence reducing the risk of clogging the ink tip. 

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Figure 2: Analytical Chemistry Lab.

The ejection mechanism precision quality is controlled in the Print Physics Lab (Figure 3). There the size, shape and trajectory of each ink drop are measured.

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Figure 3: Detail of the ejection mechanism releasing an ink drop.

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