Paper...
All paper must be separated by type: white office paper, newspaper, and magazines. Then, it's compressed into large bales for easy transport to paper mills. Once at the mill, the used paper is shredded and mixed with water to create a pulp. This pulp is cleaned before it's beaten to create slush. Then, it's put through the same paper-making process as virgin material. Recycled paper typically becomes new office paper, newspaper, toilet paper, or paper towels.
another cool aspect to these facilities is the way they ingeniously sort materials from each other. they use air gusts, lasers, mechanical means and even electron streams to separate stuff out. the electron streams for example are used to sort magnetic from non magnetic metal.