Feem ntau ntawm cov khoom siv yas ntawm cov tsheb yog txhaj moulded, vim tias cov khoom seem yas lawv tus kheej muaj cov qauv tsim qhov tseeb. Qhov tseeb ntawm kev txhaj tshuaj moulded cov khoom, uas yog, thev xaib qhov siab, cov qauv ua siab ntev thiab saum npoo ntawm cov khoom. Muaj ntau yam kev mob cuam tshuam rau kev txhaj tshuaj molding, thiab qhov tseem ceeb tshaj plaws yog plaub yam tseem ceeb ntawm cov ntaub ntawv yas, txhaj tshuaj pwm, txheej txheem txhaj tshuaj molding thiab cov khoom siv txhaj tshuaj.
Thaum tsim cov khoom yas, cov khoom siv engineering yuav tsum raug xaiv ua ntej, thiab engineering plastics uas muaj peev xwm ua tau txhaj tshuaj molding yuav tsum xaiv cov khoom siv nrog cov khoom muaj zog, qhov ruaj khov qhov ntev, zoo nkag, thiab tiv taus kev nyuaj siab ib puag ncig.
Qhov ob, kev siv lub tshuab txhaj tshuaj tsim nyog yuav tsum raug xaiv raws li cov khoom siv yas uas xaiv, tiav cov khoom lag luam qhov raug qhov tseeb, qhov nyhav, qhov ua tau zoo thiab cov qauv pwm uas xav tau. Hauv kev tsim cov txheej txheem, yam tseem ceeb uas cuam tshuam precision txhaj tshuaj moulded cov khoom lag luam feem ntau yog los ntawm qhov tseeb ntawm cov pwm, qhov ntsws me me ntawm cov txhaj tshuaj moulding, thiab cov kev hloov pauv hauv qhov kub thiab txias thiab qhov ntsuas ntawm cov khoom.
Lub hauv paus tseem ceeb cuam tshuam rau lub shrinkage tus nqi ntawm plastics yog kub shrinkage, theem hloov shrinkage, orientation shrinkage, compression shrinkage thiab elastic rov qab. Cov cuab yeej cuam tshuam no cuam tshuam txog qhov teeb meem moulding los yog kev ua haujlwm ntawm kev ua haujlwm siab ntawm kev txhaj tshuaj moulded cov khoom lag luam.
Cov txheej txheem txhaj tshuaj txheej txheem yog cov txheej txheem ntawm hloov cov plastics los ntawm cov hmoov txhuam los yog cov hmoov pellets kom cov kua hluav taws tso rau cov khoom ruaj khov. Los ntawm pellet mus rau yaj, thiab tom qab ntawd los ntawm melt mus rau cov khoom, thaj chaw kub, thaj chaw muaj kev ntxhov siab, thaj chaw ntws, thiab thaj chaw ntom ntom nti yuav tsum tau hla. Raws li kev sib koom tes ntawm cov teb no, cov yas sib txawv yog cov thermosetting lossis thermoplastic, crystalline lossis Non-crystalline, reinforced lossis non-reinforced, thiab lwm yam muaj cov qauv polymer sib txawv morphology thiab rheological zog. Txhua yam cuam tshuam rau cov teb uas hais los saum toj no yuav muaj kev cuam tshuam rau lub cev thiab cov khoom, qhov loj me, cov duab, qhov raug thiab qhov zoo ntawm cov khoom yas.