Lub hnab kas fes yog ib qho tseem ceeb ntawm kev lag luam ntim khoom, tshwj xeeb tshaj yog rau cov neeg tsim khoom kas fes uas xav kom tswj tau qhov zoo thiab qhov tshiab ntawm lawv cov khoom.Kev xaiv ntawm plaub-sab foob thiab yim-sab foob lub hnab kas fes nyob ntawm ntau yam, nrog rau qhov ntim ntawm kas fes thiab lub sijhawm khaws cia xav tau.
Thaum nws los txog rau cov khoom siv kas fes, cov chaw tsim khoom feem ntau siv cov txheej txheem ntau txheej los xyuas kom pom qhov zoo.Polyester zaj duab xis (PET), polyethylene (PE), aluminium foil (AL), thiab nylon (NY) yog cov khoom siv feem ntau hauv cov hnab kas fes.Txhua yam khoom ua rau lub hnab muaj peev xwm tiv taus ya raws, oxidation, thiab kub kub, ua kom cov kas fes nyob twj ywm tshiab rau lub sijhawm ntev.
Plaub-sab kaw lub hnab kas fes yog paub txog lawv cov qauv yooj yim.Cov hnab no zoo tagnrho rau ntim cov ntim me me ntawm kas fes uas tsis tas yuav khaws cia ntev.Lawv feem ntau yog siv los ntim cov taum kas fes, hmoov, thiab lwm yam kas fes hauv av.Nrog rau lawv cov qauv tsim ncaj nraim, cov hnab no yooj yim kaw, ua kom cov kas fes nyob ruaj ntseg thiab tiv thaiv.