1. Thaum thauj khoom lossis hloov khoom, muab tso rau ntawm lawv thiab ntswj rau ib leeg, vim tias cov xim tsis qhuav los ua cov kab ntawm lo rau ntawm qhov chaw.
2. Tus neeg teb xov tooj tau pleev xim rau ntawm nws txhais tes.
3. Muaj cov khib nyiab lossis impurities poob ntawm qhov screen thaum lub sij hawm ci xim.
Kev daws:
1. Thaum cov khoom siv nrog cov ntawv nplaum thiab cov duab kos tau teeb tsa, hlawv lossis hloov pauv, kev saib xyuas yuav tsum tau saib xyuas kom meej, thiab cov stacking yuav tsum ncaj thiab ruaj khov.
2. Cov neeg ua haujlwm yuav tsum ua kom lawv txhais tes huv si thaum ua haujlwm, thiab tsis txhob pleev xim rau.
3. Zam cov xim ci khib nyiab thiab impurities ntog ntawm qhov screen.
