Why Doesn't The Ink In Receipt Printers At Cash Registers Ever Run Out?
This question popped into my mind last time I was at
Walgreens, so I looked into it, and here's what I found.
Receipt printers use a clever technique known as ‘thermal
printing’ that doesn’t need ink. To be more specific, the ink is already sealed
within the special paper, and the act of printing requires heating up the paper.
To put this in perspective, it's sort of like a TV dinner.
The food is cooked and frozen, and all you need to do is heat it up to make it
edible.
The thermal paper has a transparent dye mixed with an acid.
When the printer head presses heat into the receipt paper, it causes the acid
and dye to chemically react with each other. The reaction converts the dye from
a transparent state into a dark pigment.
Since the printer head precisely heats up certain areas, we
recognize these dark zones as letters or images.
Where do you get these images?
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