Ngombhobho we-pvc kunye neprofayili ye-extrusion yeprofayili, umatshini wokutyumza uyimfuneko. Ngaphambi kokuveliswa okusemthethweni kunye nokuqhelekileyo kwemveliso yeplastiki, iplastiki eninzi echithwayo iya kukhutshwa. Ukuba zilahle kude, iindleko zemveliso ziya kuba phezulu kakhulu. Ngomatshini wokutyumza, iplastiki echithwayo inokutyunyuzwa ibe ngamancinci amancinci. Ngokusila, umgubo unokondliwa kwi-extruder kwaye uwenze ube yimveliso entsha yeplastiki.