Umurongo wuzuye wa kuki utunganijwe ugizwe na kuki ukoresheje extrudig ifu, iyi mashini yakoresheje umukandara wibyuma byatumijwe hanze, hamwe nubwoko bwibibumbano, irashobora kubyara ibicuruzwa amagana nibyiza kandi bifite imiterere yihariye, ni imashini zibiribwa nziza cyane, urashobora hitamo ubwoko butandukanye bwitanura (nkamashanyarazi, mazutu, gaze, amavuta yumuriro)