Ua tiav cov khoom siv rov ua dua tshiab rau khib nyiab PP, PE zaj duab xis thiab lub hnab nrog rau ob ntu.Thawj feem yog crushing, ntxuav thiab ziab ntau lawm rau PP, PE thiab lwm yam. Cov khoom kawg tom qab no tiav lawm yog huv si mos flake los yog txhav seem.Qhov thib ob yog pelletizing extrusion thiab nws cov khoom kawg yog pellet.