Qhov ua tau zoo ntawm cov tais kom qhuav tsis yog nyob ntawm qhov zoo ntawm cov tais lawv tus kheej nkaus xwb tab sis kuj tseem nyob ntawm cov khoom xws li kev ua haujlwm ntawm cov khoom siv, cov khoom siv, thiab cov cua kub. Cov ntaub ntawv tuab heev tuaj yeem cuam tshuam cov cua ntws, ua rau tsis sib xws; Yog li ntawd, cov ntaub ntawv thickness yuav tsum tau tswj kom tsim nyog raws li cov khoom tus yam ntxwv.
Tus nqi perforation thiab aperture loj ntawm cov tais kuj cuam tshuam rau huab cua kub nkag. Cov ntaub ntawv sib txawv xav tau ntau lub tais sib txawv kom ua tiav qhov kev ua kom ziab kom zoo. Tsis tas li ntawd, cov cua ntws tawm sab hauv, kev tswj qhov kub thiab txias, thiab qhov sib nrug ntawm lub tais tag nrho cuam tshuam rau qhov kawg ziab kom zoo. Kev sib piv cov cuab yeej tsis zoo nrog cov lus qhia tshwj xeeb tuaj yeem tsis tsuas yog txhim kho cov khoom zoo tab sis kuj txo qis kev siv hluav taws xob, ua tiav lub zog- ntau lawm.
