From carbonation containers to inkjet cartridges: HP's new approach

Every time I drop off an inkjet cartridge for recycling, I wonder exactly where and how they are being reused. I realize this is a totally tangential issue, but I heard today that Hewlett-Packard has figured out a way to turn post-consumer recycled plastics into new inkjet cartridges.

So far, the company reports this week, it has used more than 5 million pounds of recycled plastics from things like water or soda bottles in making more than 200 million cartridges. (For visual context, HP estimates that it has used enough recycled plastic to fill up more than 200 tractor trailers.)

The content of total plastic used in a particular cartridge can range anywhere from 70 percent to 100 percent. Who knows, you may even have used one! Now, back to my original question: What happens to all the cartridges that are collected each day? Guess I need to go do some more research.