ntug kaum
Qhov ntau ntawm cov ntaub ntawv yuav tsum tau txiav los ntawm daim ntawv txiav yog dav thiab dav, xws li npias aluminium foil cap label, carbon free carbon daim ntawv, honeycomb paperboard, magnetic card, photosensitive film, thiab lwm yam. cov ntaub ntawv no yuav ntsib ntau yam teeb meem nyob rau hauv lub txheej txheem txiav. Piv txwv li, cov ntawv luam tawm tsis muaj cov pa roj carbon monoxide yog qhov yooj yim rau indentation thaum txiav, thaum daim npav hlau nplaum thiab cov yeeb yaj kiab photosensitive yuav tsis raug kho thaum txiav, ua rau cov khoom pov tseg. Cov teeb meem no tuaj yeem daws tau yooj yim los ntawm kev kho lub siab ntawm daim ntawv xovxwm thiab txhim kho cov hniav thiab txiav kev sib kis.