Lub eco-kev taug kev phooj ywg ntawm PP lub hau tsis xaus tom qab siv; ua raws li "kev cuam tshuam ib puag ncig," nws tuaj yeem txuas ntxiv nws cov nqi los ntawm kev rov ua dua tshiab.
Thaum sau, PP lub hau tau dhau los ua cov txheej txheem xws li tu, shredding, thiab pelletizing, ua rau lawv hloov mus rau hauv cov khoom yas tshiab xws li cov thoob khib nyiab thiab paj lauj kaub. Qhov kev rov ua dua tshiab no tsis yog tsuas yog txo qis ib puag ncig cov pa phem cuam tshuam nrog kev cog qoob loo thiab kev tsim khoom, tab sis tseem khaws cov khoom siv raw, yog li ua tiav kev siv cov peev txheej.