Lub luag haujlwm tseem ceeb ntawm lub khob ntawv yog tuav dej haus - xws li cov dej qab zib carbonated, kas fes, mis nyuj, thiab dej qab zib txias - sawv cev rau nws cov ntawv thov ntxov tshaj plaws thiab tseem ceeb tshaj plaws.
Cov khob ntawv rau cov dej haus tuaj yeem muab faib ua ob hom: khob txias thiab khob kub. Cov khob txias yog tsim los tuav cov dej txias, xws li cov dej qab zib carbonated thiab kas fes iced; conversely, khob kub yog npaj rau cov dej kub, xws li kas fes thiab tshuaj yej dub.
Nws yog ib qho tseem ceeb kom paub qhov txawv ntawm qhov txias - khob haus dej thiab kub - khob haus dej haus, raws li txhua tus ua haujlwm rau lub hom phiaj tshwj xeeb; siv lawv sib hloov pauv tau-los yog "tsis raug"- tuaj yeem ua rau muaj kev hem thawj rau cov neeg siv khoom noj qab haus huv. Qhov saum npoo ntawm qhov khaub thuas- haus daim ntawv khob tau txais cov quav ciab- tshuaj tsuag lossis siv quav ciab- kev kho mob immersion. Qhov no yog qhov tsim nyog vim tias cov dej haus txias ua rau cov dej sib xyaw ua ke ntawm lub khob saum npoo, ua rau cov ntawv ua mos; lub wax txheej renders lub khob waterproof. Cov wax no tseem ruaj khov thiab nyab xeeb nyob rau hauv qhov kub ntawm 0℃txog 5 degree.
Txawm li cas los xij, yog tias lub khob txias yog siv los tuav cov dej kub - tshwj xeeb yog thaum cov kua kub siab tshaj 62℃- cov quav yuav yaj, ua rau lub khob ntawv nqus dej thiab poob nws cov duab. Tsis tas li ntawd, cov tshuaj yaj yeeb yaj kiab muaj cov khoom tsis huv ntau ntau-tshwj xeeb tshaj yog polycyclic aromatic hydrocarbons (PAHs). Cov organic tebchaw no yog cov muaj peev xwm carcinogens uas, yog tias noj nrog rau cov dej haus, tuaj yeem ua rau tib neeg noj qab haus huv. Nyob rau hauv sib piv, nto ntawm ib tug kub - khob ntawv khob yog lined nrog ib tug tshwj xeeb, lub teb chaws pom zoo polyethylene zaj duab xis; cov ntaub ntawv no tsis yog tsuas yog muaj kev tiv thaiv kub zoo xwb tab sis kuj tseem tsis yog - tshuaj lom thiab tsis muaj mob txawm tias thaum raug los yog raus rau hauv siab - dej haus. Cov khob ntawv yuav tsum muab khaws cia rau hauv qhov dej - qhov cua, txias, qhuav, thiab kis kab mob{12}} ib puag ncig dawb; Feem ntau, lawv lub sijhawm cia yuav tsum tsis pub tshaj ob xyoos txij li hnub tsim khoom.
