Cov txheej txheem tsim khoom rau nruj- cov boards hloov tau feem ntau suav nrog cov kauj ruam xws li xaiv cov khoom siv, lamination, thiab nias. Feem ntau hais lus, cov ntaub ntawv siv los ua cov boards yuav tsum muaj cov khoom zoo heev - hloov tau yooj yim thiab ruaj khov. Thaum lub sij hawm lamination, cov ntaub ntawv nruj thiab hloov tau raug xaiv thiab muab tso rau raws li kev faib ua feem thiab cov qauv los tsim lub rooj tsav xwm xav tau. Thaum kawg, nias yog siv los tuav cov txheej txheem ua ke.
