Isikulufu somshini wokubumba umjovo siyingxenye eyinhloko yomshini, esetshenziselwa ukudlulisa, ukuhlanganisa, ukuncibilikisa, kanye nokucindezela izinto zokusetshenziswa zepulasitiki. Ukwakheka nokusebenza kwayo kuthinta ngqo ukusebenza kahle kwe-plasticizing kanye nekhwalithi yomkhiqizo.
Umzimba wesikulufu uqukethe isigaba sokuphakelayo, isigaba sokuminyanisa, nesigaba se-homogenization. Isigaba sokuphakela sinesibopho sokushisa kuqala nokudlulisa izinto ezingavuthiwe eziqinile; ingxenye yokucindezela ifinyelela ukuncibilika, ukuxubana, nokukhipha umoya; futhi isigaba se-homogenization siqinisekisa ukufana kwezinga lokushisa elincibilikayo kanye nokuzinza kokugeleza. Ngokusekelwe kumehluko wezakhiwo zepulasitiki, izikulufu zingahlukaniswa ngezinhlobo ezintathu: uhlobo lwegradient (lufanele ukushisa-izinto ezizwelayo ezifana ne-PVC), uhlobo oluphuthumayo (olufanele ama-polyolefin), kanye nohlobo lwenhloso evamile. Umehluko omkhulu usekuklameni kwamandla obude nokushear kwesigaba sokuminyanisa. Amapharamitha angukhiye afaka phakathi ububanzi, i-aspect ratio, kanye ne-compression ratio, okumele ifaniswe nezinto ezibonakalayo ukuze kuthuthukiswe imiphumela ye-plasticizing. Izinto ezisetshenziswa kaningi ziphezulu-zingamazinga okushisa aphezulu futhi ziyaguga-izinto ezingazweli njenge-38CrMoAla alloy ne-tungsten carbide nickel{10}based alloy. Ngesikhathi sokusetshenziswa, inqubo yokushisisa okujwayelekile kanye nokuhlanza nokugcinwa njalo kuyadingeka ukuze kuvinjelwe ukushelela kwesikulufa noma ukulimala komshini.
