ʻAʻole like me nā kaʻina hana hoʻoneʻe waiwai, ʻo ka extrusion alumini kahi kaʻina hana.I ka extrusion, hoʻomāhana mua ʻia ka alumini maka a laila hana ʻia i loko o ka ʻāpana i makemake ʻia e hoʻohana ana i ka hipa kāne e hoʻokuʻu iā ia i loko o kahi make.Hoʻohana ka hoʻokuʻu alumini i nā kumulāʻau pōʻai o ka alumini a i ʻole ke alumini alumini, i kapa ʻia ʻo "billets", e hana i nā ʻāpana me nā ʻaoʻao a me nā ʻano like ʻole.
ʻO ka mea nui, pono wale ke kaʻina hana extrusion alumini i kahi umu ahi a me kahi paʻi me kahi make.No ka extrusion, hoʻomāmā mua ʻia ka billet i kahi wela kiʻekiʻe e ʻoi aku ka ductile.Aia paha ka wela ma kahi kokoke i ka lumi wela a i ʻole ke kiʻekiʻe e like me ka mahana recrystallization.Ma muli o kēia mahana, ua kapa ʻia ke kaʻina hana i ke anuanu, mahana a wela paha.