I-rumen yinxalenye ebalulekileyo yenkqubo yokwetyisa yenkomo eqhekeza i-cellulose kunye nezinye izinto zezityalo. Noko ke, ngenxa yokuba iinkomo zidla ngokuphefumla izinto zentsimbi xa ziginya ukutya, njengezikhonkwane zeenkomo, iingcingo zentsimbi, njl. Umsebenzi wemagnethi yerumen kukufunxa kunye nokuqokelela izinto zesinyithi kwirumen, zithintele ukuba zingathukutheli udonga lwerumen, kwaye zithomalalise ukungakhululeki kunye neempawu ezibangelwa yimizimba yangaphandle kwirumen. Iimagnethi yerumeitsala into yesinyithi ngokwemagnethi, ukuze imiliselwe kwimagnethi, ithintele ukuba ingaqhubeli phambili okanye ibangele umonakalo kudonga lwerumen.