a granulator for comminuting plastic web scrap has features that allow it to also granulate three dimensional objects . the granulator has a pair of nip rollers mounted above a cutter assembly for drawing the web into the cutter assembly . the nip rollers have grabbing devices for grabbing three dimensional objects when they fall onto the rollers , for shredding the objects and forcing them between the rollers . in one embodiment , the grabbing device consists of a groove formed in the surface of at least one of the rollers . the groove has a sharp - edged trailing surface that grabs the article . in another embodiment , the grabbing device consists of a protruding finger that grabs the article . to provide clearance , a circumferential slot is located in the other roller for receiving the finger .