Raws li cov kev cai hauv tebchaws, cov ntawv pov tseg pov tseg" tsis tuaj yeem sib ntxiv nrog cov roj fluorcent whitening tus neeg saib xyuas" ;. Cov ntawv uas siv tas pov tseg tau muab faib ua khob dej txias thiab khob dej khob haus dej raws li lawv lub hom phiaj. Thaum siv tsis raug lossis siv tsis raug, nws yuav cuam tshuam rau kev noj qab haus huv ntawm lub cev. Cov khoom siv raw rau cov txheej txheem dej ntawm lub khob ntawv pov tseg yog polyethylene. Lub khob ntim ntawv qis dua yog tsim los ntawm cov khoom siv rov ua dua tshiab, uas yuav tsim ntau yam khoom tsis zoo hauv cov txheej txheem ntawm cov txheej txheem. Lub khob ntawv yog txheej nrog txheej txheej ntawm polyethylene dej-pov thawj zaj duab xis nyob sab hauv kom ua tiav cov dej-pov thawj cov nyhuv.
Qhov saum npoo ntawm lub khob txias khob ntawv yuav tsum tau muab xaum los yog quav ua kom tiav cov dej tsis qab. Tom qab cov dej kub siab tshaj 62 qib, qhov ruaj ntseg ntawm cov quav ciab tsis muaj zog thiab lub khob ntawv ua mos muag. Ntawm lawv, cov tshuaj muaj kuab lom yuav noj tau los ntawm tib neeg lub cev nrog rau dej. Qhov saum npoo ntawm lub khob dej haus cawv yog cov yeeb yaj kiab polyethylene tshwj xeeb pom zoo los ntawm lub teb chaws, uas muaj cov cua kub zoo thiab tsis muaj tshuaj lom.
Tsis tas li ntawd, tseem muaj cov qauv kev cai rau qhov tuab thiab permeability ntawm cov ntawv khob. Hauv qab thiab ob sab ntawm lub khob tsis tuaj yeem pom dej lossis dej, thiab daim ntawv yuav tsum tsis txhob dhau.