Kunja kwa mbiya thupi ndi rotational akamaumba ndondomeko.PE polyethylene pulasitiki zakuthupi, kukana zimakhudza, kukana kuzizira, kuyeretsa
yabwino komanso yachangu, yosavuta kubisa dothi ndi dothi, moyo wautali wautumiki, ukhoza kukhala wapamwamba, kugwiritsa ntchito zoyendera momasuka.
Chophimba cha mbiya chimaperekedwa ndi chivundikiro chopumira, chomwe chimatha kuwongolera kuthamanga kwa mpweya mkati ndi kunja kwa thupi la mbiya.
