Txoj keeb duab no yog ib qhov chaw pab rau kev tsim kho tshuaj plastic thiab lwm yam khoom siv ntau, uas muaj feem ntau tshwj xeeb tshwj nyob rau hauv qhov keeb duab thiab lwm feem ntau tshwj xeeb rau kev tsim kho raw material mus rau finished product. Nyob hauv plab ntawm nws yog qhov keeb duab tseem ceeb, uas muaj feem ntau yog motor, gearbox, screw, thiab barrel, uas pab kho thiab ntxuav tshuaj. Tab sis, lub npe "keeb duab" txhais tau tias nws yog ib qho chaw sib sau ua ke. Qhov no feem ntau pib nrog cov cuab yeej hauv qab, zoo li tsev kho tseg khoom siv, vacuum loaders, thiab dehumidifying dryers, uas pab tso kom muaj khoom siv tas li thiab tsis muaj dej. Lub polymer hlwb tom qab ntawv yog tsim los ntawm ib qhov die, ib qhov khoom siv tseem ceeb thiab tsim tshiab uas txiav txim siab lub geometry ntawm daim ntawv. Thaum tam sim tom qab die, cov cuab yeej hauv qab rov tshwm sim: ib qhov kho (feem ntau siv vacuum thiab dej sib txawv) rau kev tsim kho daim ntawv, ib qhov tsev kho rau kawg qhov kev kho, ib tug haul-off lossis puller rau kev tshem tawm thiab tshem tawm daim ntawv, thiab thaum kawg, ib tug cutter lossis winder rau kev kho daim ntawv rau lub dav. Txoj keeb duab tag nrho yog ib qhov chaw pab uas synchronizes lub zog ntawm extruder screw, haul-off, thiab cutter, thaum kuj tshawb pom thiab saib xyuas temperatures thiab pressures tag nrho lub teb. Lub zog ntawm ib qhov keeb duab yog muab nqi los ntawm nws qhov stability, output rate, thiab nws tus cwj pwm tsim ib qhov khoom siv uas muaj dimensions, appearance, thiab physical properties tseem ceeb, ua rau nws ib qhov chaw tsim kho tseem ceeb thiab tshaj tawv.