http://www.waste-management-world.com/articles/print/volume-9/issue-4/features/waste-sorting-a-look-at-the-separation-and-sorting-techniques-in-todayrsquos-european-market.html
On Fri, Jan 31, 2014 at 4:50 PM, <[email protected]> wrote: > I am working with my friend Howard Walker. He is in the junk plastic > business. The plastic bottles are worth 12 cents a pound in bulk. If > separated into 1,2,3,4 and 5 the plastic is worth 24 cents a pound. > > I found that #1 the clear coke bottle plastic if opaque to mid infrared. > I blocks a security lights thermal sensor. > It transmits visible light. This was a good find as these bottles are > worth the most separated. A ratio detector should work well. > > I found #2 milk bottle plastic is opaque to a blue LED light. The mid > infrared goes right through it. > A ratio detector should work well. > > I have found no detection method for #5 semi clear plastic. All light > goes through it. Darn! > It does, however, scatter a red laser. I am not sure it this effect can > be employed. > > They are all transparent to a UV black light. I did not expect this! > > The bottles are all smashed up and the detection technique must be > robust. We will use a transmission test to avoid the > labels. No transmission because of a label is not a condition. > > They are all transparent to near IR when I check it with my video camera > and a TV remote. Too bad. > > any ideas? > > Frank Znidarsic > > >
