Lub hnab hauv qab tiaj yog qhov kev xaiv nrov tshaj plaws hauv lub neej txhua hnub.
OPP, PET, txhuas, PE muaj pes tsawg leeg. Nws cov yam ntxwv yog kev sib xyaw ua ke zoo heev, lub zog tsim kua muag tsawg, yooj yim los tsim kua muag nyob rau hauv ob qho tib si ntsug thiab kab rov tav cov lus qhia tom qab lub hnab ua, tsis tshua muaj sealing kub, haum rau high-speed automatic ntim, kom tsis txhob muaj kev cuam tshuam ntawm oxygen, ultraviolet thiab lwm yam.