Txoj kev extrusion rau cov yas extruder feem ntau yog hais txog cov txheej txheem ntawm melting yas ntawm qhov kub thiab txias -feem ntau nyob ib ncig ntawm 200℃- thiab tom qab ntawd dhau cov yas molten los ntawm kev tuag los ua ib qho kev xav tau. Extrusion molding xav tau kev nkag siab zoo ntawm cov khoom yas thiab kev paub dav hauv kev tsim tuag; yog li ntawd, nws yog txoj kev molding nrog cov kev xav tau siab heev.
Extrusion molding yog txheej txheem uas cov khoom raug yuam mus tas li los ntawm kev tuag hauv cov dej hauv lub xeev - tau yooj yim los ntawm cua sov thiab nias hauv extruder - kom ua tiav cov duab tshwj xeeb; nws tseem hu ua "plastic extrusion." Piv rau lwm txoj kev molding, nws muaj qhov zoo ntawm kev ua haujlwm siab thiab cov nqi qis.
Txoj kev extrusion feem ntau yog siv rau molding thermoplastic plastics, txawm tias nws tuaj yeem siv rau qee yam thermosetting plastics. Cov khoom siv extruded siv cov ntaub ntawv txuas mus ntxiv- xws li cov kav dej, cov pas nrig, cov xov hlau, cov ntawv txheeb, cov yeeb yaj kiab, thiab xaim thiab cable sheathing. Tsis tas li ntawd, cov txheej txheem tuaj yeem ua haujlwm rau kev sib xyaw yas, plasticizing thiab pelletizing, xim, thiab compounding.
Extruded khoom feem ntau hu ua "profiles"; muab hais tias lawv tus ntoo khaub lig- cov duab ntu feem ntau tsis sib xws, lawv kuj yog feem ntau hu ua "tshwj xeeb-zoo li tus profiles."
