Adaptive Sorting of Plastic Granulates

To produce colorfast recycled PP granulate the processing chain has to ensure that the highly variable color distribution of the feedstock (e.g. leightweight packaging) is stabalized to a target value which is dictated by the customer. This is currently done batch-wise by fixed color sorting unaware of the target color value to meet and therefore costly over-dying. The approach presented can cope with the high variability in color distribution by identifying particles violating the target color. The approach is evaluated through simulations based on real world data.