Tsis zoo li cov txheej txheem tshem tawm cov khoom, aluminium extrusion yog txheej txheem tsim.Nyob rau hauv extrusion, raw aluminium yog thawj rhuab thiab ces zoo li tus mus rau hauv qhov yuav tsum tau ib feem siv ib tug ram los thawb nws los ntawm ib tug tuag.Aluminium extrusion siv puag ncig cov khoom lag luam ntawm txhuas lossis txhuas alloy, hu ua "billets", los tsim cov khoom nrog cov khoom seem thiab cov duab.
Feem ntau, txhuas extrusion txheej txheem tsuas yog yuav tsum tau lub cub tawg thiab xovxwm nrog ib tug tuag.Rau extrusion, lub billet yog thawj rhuab mus rau ib tug kub kub kom nws ntau ductile.Qhov kub yuav nyob ze ntawm chav tsev kub los yog siab li recrystallization kub.Raws li qhov ntsuas kub no, cov txheej txheem hu ua txias, sov lossis kub extrusion.