Li-extruder tsa polasetiki ke lisebelisoa tsa mantlha indastering ea ho lokisa lipolasetiki, tse sebelisoang haholo tlhahisong ea lihlahisoa tsa polasetiki tse kang liphaephe, profiles, lifilimi, le terata le li-cable insulation. Molao-motheo oa bona oa ts'ebetso ke ho qhibilihisa lisebelisoa tse tala tsa polasetiki (tse kang li-granules kapa phofo) ka mocheso le khatello e hlahisoang ke screw e potolohang, le ho tsoela pele ho li ntša ho etsa sehlahisoa sa sebopeho se itseng.
Li-extruder tsa polasetiki li na le likarolo tse tharo tse kholo: sistimi ea extrusion, sistimi ea ho khanna, le sistimi ea ho futhumatsa le ho futhumatsa. Sistimi ea extrusion, e kenyelletsang hopper, screw, le barrel, ke motheo oa lisebelisoa. Lintho tse tala tsa polasetiki li kena ka har'a barrel ho tloha ho hopper 'me li fetisetsoa pele ke screw e potolohang, ha polasetiki e ntse e qhibiliha butle-butle ke sesebelisoa sa ho futhumatsa se ka ntle ho barrel. Moralo oa screw o ama ka kotloloho phello ea polasetiki le katleho ea tlhahiso. Mefuta e tloaelehileng ea likurufu e kenyelletsa butle-butle-ho fetoha, ho fetoha ha tšohanyetso-me mefuta ea ho arohana, e loketseng lisebelisoa tse fapaneng tsa polasetiki le litlhoko tsa ts'ebetso. Sistimi ea ho khanna e fana ka matla a hlokahalang bakeng sa ho potoloha ha screw 'me hangata e na le motor, reducer, le bearings, ho netefatsa lebelo le tsitsitseng la screw. Sistimi ea ho futhumatsa le ho futhumatsa e laola mocheso oa moqomo ka nepo, e netefatsa hore polasetiki e qhibiliha hantle ha e ntse e thibela ho futhumala le ho senyeha.
Li-extruder tsa polasetiki li ka aroloa e le-screw, screw-mafahla, le li-screw tse ngata- ho latela ts'ebeliso ea tsona. -li-screw extruder, ka sebopeho sa tsona se bonolo le theko e tlase, li loketse ho sebetsa-lipolasetiki tsa morero. Mafahla-li-screw extruder, tse nang le bokhoni bo matlafalitsoeng ba ho tsoaka, hangata li sebelisoa bakeng sa{8}}mekhoa e nepahetseng joalo ka ho kopanya, ho fetola, ho tlatsa le ho kopanya. Li-screw extruder{10}li ngata li sebelisoa haholo ho lokisa lisebelisoa tse khethehileng tsa polymer. Ntle le moo, li-extruder tsa sejoale-joale hangata li na le lisebelisoa tsa taolo tse ikemetseng, tse nolofalletsang ho lokisoa hantle ha maemo a kang mocheso, khatello le lebelo, ho ntlafatsa katleho ea tlhahiso le boleng ba sehlahisoa.
Li-extruder tsa polasetiki li bapala karolo ea bohlokoa indastering ea kaho, ea likoloi, ea bongaka le ea ho paka. Ka mohlala, li-extruder tsa lipeipi tsa PVC li sebelisetsoa ho hlahisa liphaephe tsa metsi le liphaephe tsa metsi, ha li-extruder tsa filimi tse bululetsoeng li sebelisetsoa ho etsa lifilimi tsa ho paka lijo. Ka lebaka la litlhoko tse ntseng li eketseha tsa ts'ireletso ea tikoloho le paballo ea matla, mekhoa e sebetsang hantle le ea ho boloka matla-e se e fetoha mokhoa oa indasteri, o tsamaisang tšebetso ea polasetiki e lebisang tšebetsong e bohlale le e nepahetseng.
