Muaj ob hom ntawv tseem ceeb hauv tsev: yob daim ntawv siv hauv chav dej; Feem ntau siv cov ntaub so ntswg thiab cov ntaub so ntswg (paper phuam, ntawv phuam so tes). Lub teb chaws tus qauv kev tu cev rau cov ntaub so ntswg, xws li tus qauv rau tag nrho cov kab mob kab mob hauv ib gram tsis pub tshaj 200 units, thiab kev txwv rau tag nrho cov kab mob kab mob ntawm daim ntawv tso quav tso zis tsis pub tshaj 600 units, yog li los ntawm kev xav ntawm cov kab mob. , daim ntawv tso quav tso zis ntau dua.
Cov ntaub ntawv hauv chav dej tuaj yeem siv tau cov ntawv pov tseg lossis cov khoom siv hauv tsev, thaum tsis pub cov ntaub so ntswg. Yog li ntawd, tsis muaj qhov yuav tsum tau ua rau cov ntsuas kab mob fungal hauv daim ntawv tso quav. Yog li ntawd, nyob rau hauv lub neej txhua hnub, sim tsis txhob siv cov ntaub so ntswg los so koj lub ntsej muag lossis qhov ncauj. Tsis tas li ntawd, cov fibers ntev nyob rau hauv daim ntawv phuam da dej thiab cov ntawv nqus tsev yog 5% mus rau 10% siab dua li cov ntawv tso quav tso quav. Nws tsis yooj yim rau plam hmoov thiab plaub hau, yog li rau cov neeg muaj kab mob ua pa, nws yog qhov zoo tshaj plaws tsis txhob siv cov ntaub so ntswg los so lawv lub ntsej muag, yog li tsis txhob nqus cov ntawv plaub hau rau hauv lawv lub qhov ntswg thiab cuam tshuam rau lawv txoj kev noj qab haus huv.
Kev txhawj xeeb txog fluorescent dyes thiab yuav tsum tau ntxuav tes tsis tu ncua: Cov neeg ceev faj yuav pom cov lus no thaum xaiv daim ntawv: hloov tau fluorescent whitening agents. Nws yog tiag tiag fluorescent dye lug siv nyob rau hauv ntau industries, txawm lub A4 daim ntawv peb feem ntau siv muaj ib tug npaum li cas ntawm fluorescent whitening agent.