Cov khoom siv ua haujlwm:
1. Sab laug quav ob zaug, txoj cai quav ib zaug thiab longitudinal quav ob zaug.
2. Tom qab folding, phau ntawv bagging tuaj yeem ua rau ntawm ib qho, lossis phau ntawv ntim tuaj yeem ua rau ntau daim.
3. Cov khoom siv tuaj yeem nkag ncaj qha rau qhov loj ntawm lub tsoos tsho tom qab folding, thiab qhov folding dav thiab ntev tuaj yeem hloov kho kom zoo los ntawm lub kaw lus.