Making money is actually a much more complicated process than you might think. There are incredible processes involved in order to protect the currency from counterfeiters or people committing fraud. U.S. paper money is made at the Bureau of Engraving and Printing. Currently, our paper money is made up of 25% linen and 75% cotton. Red and blue fibers of various lengths are distributed evenly throughout the paper in order to protect from fakes. There are five steps that how money is made, first going through a siderographer, who duplicates an engraving over and over multiple times through a process called Intaglio printing. Intaglio printing is a high-speed rotary press which produces over 8,000 sheets of money per hour. The second step is plate making, which the die is put under pressure, heated, and an impression of it is cast into plastic. The next step is the printing step, which goes to the Intaglio high-speed printers. Examining is the fourth step, which is where a specially authorized person examines the money for defects. If it is accepted, it is sent to the next step of overprinting. Overprinting is where a letterpress is used to print the Federal Reserve District seal and its serial number in green ink on the bill. The units of money are then banded together and packaged into bricks, containing 4,000 notes.
As you can see, this a very time-consuming process. You can read more about the production of money here: http://www.moneymuseum.com/standard_english/raeume/geld_machen/werkstatt/papiergeld/papierdruck/papierdruck_unten.html
Money Smart Kid