Thermoplastic txhaj molding yog hais txog cov txheej txheem ntawm kev tsim cov khoom siv thermoplastic yas ua cov khoom siv raw, siv cov txheej txheem txhaj tshuaj molding.
Rov qab Softening thiab Hardening: Thermoplastics yaj mus rau hauv lub xeev cov kua dej thaum rhuab thiab solidify rau hauv ib tug ruaj khov zoo thaum txias. Cov txheej txheem no suav nrog kev hloov pauv lub cev uas tuaj yeem rov ua dua ntau zaus, yog li ua kom yooj yim rov siv dua thiab rov siv dua.
Nyob rau hauv cov thermoplastics raug, qhov hnyav molecular ntawm cov polymers tuaj yeem nyob ntawm ntau pua txhiab mus rau ntau lab, thiab qhov ntev ntawm cov saw hlau macromolecular tuaj yeem ncav cuag 10⁻³ mm. Cov macromolecules no tej zaum yuav linear-xws li LLDPE thiab HDPE-los yog ceg, xws li LDPE. Cov macromolecules ua entangled nrog ib leeg, npaj lawv tus kheej nyob rau hauv ib qho kev tsis sib haum xeeb los yog raug txiav txim los ua ib tug "condensed- xeev qauv."
Thaum cov macromolecules tau teem rau hauv ib qho kev tsis sib haum xeeb, cov khoom raug cais raws li amorphous thermoplastic; Piv txwv li PVC, PC, thiab PMMA. Cov ntaub ntawv no yog tus cwj pwm los ntawm qhov pom zoo, tsis tshua muaj kev siv tshuab, thiab kev ua haujlwm siab. Hloov pauv, cov ntaub ntawv uas qee cov macromolecules - lossis ntu ntawm ntawd - tau muab tso rau hauv ib qho kev sib xws, cov qauv txiav txim yog cais raws li crystalline thermoplastics; piv txwv xws li LLDPE, POM, thiab nylon. Cov ntaub ntawv no yog tus cwj pwm los ntawm qhov tsis pom kev tsis zoo, lub zog ua haujlwm siab, thiab qis dua.
Siab Moulding Efficiency thiab Suitability rau Mass Production: Lub voj voog txhaj tshuaj molding yog luv (feem ntau 30-60 vib nas this), automation yog yooj yim siv, thiab chav tsev nqi ntawm ntau lawm yog tsawg.
