Lub hnab ntawv rov qab yog qhov tshwj xeeb tshaj yog siv rau kev xa cov ntaub ntawv, duab, kos duab, thiab lwm yam khoom uas tsis muaj zog, uas yuav tsum tau tswj lawv cov duab thiab kev mob. Qhov kev txhawb nqa nruj ua kom cov ntsiab lus nyob tiaj tus thiab ruaj ntseg, txawm tias raug tuav ntawm cov kev pabcuam xa ntawv.

board-backed hnab ntawv board-backed hnab ntawv muab kev ruaj ntseg thiab kev daws teeb meem rau kev xa khoom rhiab lossis muaj txiaj ntsig, muab kev tiv thaiv thiab kev thaj yeeb ntawm lub siab rau cov neeg xa khoom thiab cov neeg tau txais ib yam nkaus. Lawv yog ib hom ntawv xa ntawv uas tsim los nrog cov duab los qhia ruaj khov los muab kev txhawb nqa thiab kev tiv thaiv zoo rau cov ntsiab lus thaum thauj thiab tuav.

board-backed hnab ntawv board-backed hnab ntawv muab kev ruaj ntseg thiab kev daws teeb meem rau kev xa khoom rhiab lossis muaj txiaj ntsig, muab kev tiv thaiv thiab kev thaj yeeb ntawm lub siab rau cov neeg xa khoom thiab cov neeg tau txais ib yam nkaus. Lawv yog ib hom ntawv xa ntawv uas tsim los nrog cov duab los qhia ruaj khov los muab kev txhawb nqa thiab kev tiv thaiv zoo rau cov ntsiab lus thaum thauj thiab tuav.

board-backed hnab ntawv board-backed hnab ntawv muab kev ruaj ntseg thiab kev daws teeb meem rau kev xa khoom rhiab lossis muaj txiaj ntsig, muab kev tiv thaiv thiab kev thaj yeeb ntawm lub siab rau cov neeg xa khoom thiab cov neeg tau txais ib yam nkaus. Lawv yog ib hom ntawv xa ntawv uas tsim los nrog cov duab los qhia ruaj khov los muab kev txhawb nqa thiab kev tiv thaiv zoo rau cov ntsiab lus thaum thauj thiab tuav.

Cov hnab ntawv rov qab yog cov hnab ntawv xa ntawv ruaj khov nrog cov ntaub ntawv nruj rov qab los muab kev tiv thaiv ntxiv rau cov ntsiab lus sab hauv. Cov hnab ntawv no feem ntau yog siv rau kev xa cov ntaub ntawv tseem ceeb, duab, ntawv pov thawj, kos duab, lossis lwm yam khoom uas yuav tsum tau khaws cia thiab tiv thaiv thaum caij tsheb npav. Lub rooj tsavxwm rov qab pab tiv thaiv kev khoov, folding, lossis crease ntawm cov ntsiab lus, kom lawv tuaj txog ntawm lawv qhov chaw zoo. Lub hnab ntawv rov qab feem ntau muaj lub ntsej muag kaw kom yooj yim kaw thiab tuaj nyob rau hauv ntau qhov ntau thiab tsawg kom haum rau ntau hom ntaub ntawv.

Lub hnab ntawv rov qab yog ib qho tseem ceeb ntawm kev xa ntawv xa tuaj rau cov tib neeg thiab cov lag luam nrhiav kom muaj kev nyab xeeb thiab ruaj ntseg xa cov ntaub ntawv tseem ceeb, duab, kos duab, lossis lwm yam khoom tiaj tus. Cov hnab ntawv no feem ntau muaj cov duab los yog cov ntaub ntawv uas muaj zog uas txuas nrog rau daim ntawv lossis polythene pem hauv ntej. Lub nraub qaum nruj pab tiv thaiv kev khoov, folding, lossis creasing ntawm cov khoom uas nyob ib puag ncig, kom ntseeg tau tias lawv tuaj txog ntawm lawv qhov chaw nyob hauv qhov chaw zoo nkauj.