A cikin general m bango elliptical rufe kai a rolling tsari, packing lamarin ya faru mafi yawa a rufe kai curvature babban sassa, ta amfani da madaidaiciya gaba daya rolling model, da farko a kusa da rufe kai curvature sassa don pre-matsa lamba, sa blanks zama a matsayin kwandon, sa'an nan kuma matsa lamba da convex mold.
Ta wannan hanyar, a cikin babban sassan curvature, saboda pre-matsa lamba a cikin wani geometry siffar, a cikin pre-matsa lamba yankin akwai sanyi yi karfi bayyanar, kara rigidity a cikin blank abu karkatarwa tsari, taimakawa ba zai faru packing bayyanar.
A matsa lamba tsari, pre-matsa lamba lokacin, ba za a iya yin wani pre-matsa lamba mold, za a iya karɓar wani bayani matsa lamba madaidaiciya na rufe kai mold, amma waje da iyaka ya kamata juya zagaye, waje diamita ne mafi ƙarancin 100 ~ 200mm fiye da ciki diamita na kanta mold, don haka shi ne daidai matsa a kan rufe kai kafin ƙirƙirar marufi bangaren, don haka za a iya kauce wa marufi lamarin faruwa.