Aug 01, 2020· Lot 1 was ground using a hammer mill (Glen Mills Inc., USA; Model 10HMBL). Lot 2 was ground using a knife mill (Retsch, model: SM 100). Each grinder was equipped with one of the three screens 2, 4 and 6-mm diagonal dimension. The hammer mill did not shred paper and plastics for these fractions to pass through screen holes.