1. Tom qab ntawd, lub khob ntawv yuav kaw lub khob hauv qab thiab lub khob phab ntsa, thiab tom qab ntawd cov cua kub yuav raug tshuab kom ua raws. Tom qab ntawd muaj cov kauj ruam knurling ntawm daim ntawv khob tshuab, uas yog, thaum lub hauv qab ntawm lub khob ntawv yog sib koom, ib txheej ntawm cov qhab nia yog dov los ntawm cov neeg kho tshuab txav. Thaum kawg, hemming kauj ruam ntawm daim ntawv khob tshuab yog tsim lub hemming ntawm lub qhov ncauj ntawm lub khob ntawv.
2. Cov ntsiab lus ua haujlwm ntawm cov ntawv khob tshuab ntawm lub khob ntawv yog pib nrog cov ntawv tsis siv neeg pub mis, thiab tom qab ntawd tsim cov ntawv khob tiav los ntawm cov txheej txheem tas li xws li hauv qab dej ntws, sealing, cua sov, hauv qab tig, knurling, edging thiab khob unloading.