Cov cuab yeej tiv thaiv yog hais txog ib yam khoom siv tiv thaiv tsim nyog los tiv thaiv tus kheej kev nyab xeeb thiab kev noj qab haus huv ntawm cov neeg ua haujlwm hauv cov txheej txheem tsim khoom, thiab ua lub luag haujlwm tseem ceeb hauv kev txo qis kev ua haujlwm. Kev tiv thaiv kev nyab xeeb ntawm tes thaum ua haujlwm feem ntau yog nyob ntawm cov hnab looj tes. Thaum siv cov hnab looj tes tiv thaiv, tom qab tshuaj xyuas cov khoom ua haujlwm, cov khoom siv thiab kev ua haujlwm, xaiv cov hnab looj tes ua los ntawm cov ntaub ntawv tsim nyog thiab yooj yim rau kev khiav lag luam txhawm rau ua lub luag haujlwm tiv thaiv. Tab sis rau cov haujlwm uas xav tau kev kho kom zoo. Kev hnav cov hnab looj tes tiv thaiv tsis yooj yim rau kev khiav lag luam, tshwj xeeb tshaj yog rau cov neeg ua haujlwm uas siv cov tho xovxwm, milling tshuab thiab conveyors thiab nyob rau hauv qhov chaw uas muaj kev pheej hmoo ntawm pinching. Yog tias siv hnab looj tes, muaj kev pheej hmoo ntawm kev sib tsoo lossis pinched los ntawm cov tshuab. Yog li ntawd, cov neeg ua haujlwm koom nrog cov haujlwm no raug txwv tsis pub siv cov hnab looj tes tiv thaiv.
