Kev txhaj tshuaj molding yog txheej txheem tsim khoom uas sib xyaw cov txheej txheem txhaj tshuaj thiab molding. Nws qhov zoo muaj xws li kev tsim khoom ceev ceev, kev ua haujlwm siab, thiab lub peev xwm rau kev ua haujlwm tsis siv neeg. Nws txhawb ntau yam tsim thiab xim, haum rau cov duab xws li yooj yim mus rau complex thiab ntau thiab tsawg los ntawm loj mus rau me me, thiab xyuas kom meej cov khoom qhov ntev. Tsis tas li ntawd, nws yooj yim rau kev hloov kho cov khoom lag luam yooj yim thiab muaj peev xwm ua tau qhov chaw nrog cov geometries intricate, ua rau nws zoo tagnrho rau cov khoom loj ntawm cov khoom nyuaj.
Cov txheej txheem no suav nrog kev txhaj tshuaj tag nrho cov khoom siv yas melted-liquefied los ntawm cov ntsia hlau agitation ntawm ib tug tshwj xeeb kub- mus rau hauv lub pwm kab noj hniav nyob rau hauv siab siab, ua raws li los ntawm txias thiab solidification los tsim cov khoom tiav. Nws yog ib qho tseem ceeb ntawm txoj kev tsim khoom tsim nyog rau kev tsim khoom loj ntawm cov khoom siv.