Detail of Bumper - to - bumper recycling
Given this, we surmised that if we could detect and remove bumper pellets with an area of residual paint over 10 mm2, we would achieve a high yield of recycled material at the target paint removal rate. (Yield is defined as: 'the number of paint-free pellets/the total number of crushed pellets x 100.'
- Selection mechanism
Crushed bumper pellets are subjected to the paint stripping process, then collected in a hopper and passed through a shooter. As they exit the shooter, light is shone on them from various angles. Any paint adhered to the fragments reflects light more intensely than the (black) bumper material. Charged-coupled device (CCD) sensors detect the reflected light and an air jet immediately removes the unwanted pellets.
This mechanism to separate crushed bumper pellets successfully improves the average rate of paint removal from 98.50 to 99.85 percent.