1.Qhov flexo tshuab luam ntawv tuaj yeem ua ob-sided luam ntawv los ntawm kev hloov pauv txoj kev ntawm lub substrate.
2.Qhov luam ntawv luam ntawv ntawm lub tshuab luam ntawv yog ib daim ntawv, kraft ntawv, khob khob thiab lwm yam ntaub ntawv.
3.Tus daim ntawv nyoos unwinding rack admts ib-chaw nres tsheb cua nthuav txuj ci tsis siv neeg unwinding txoj kev siv tsis siv neeg.
4.Qhov nro yog taper tswj tshuab los xyuas kom meej qhov tseeb ntawm kev nkag tsis tau.
5.Qhov cua tshuab uas tau tsav los ntawm lub cev muaj zog, thiab cov menyuam cov menyuam muaj peev xwm kaw-voj kev tswj hwm.
