Nyob rau hauv cov txheej txheem ntawm plasticizing yas raw cov ntaub ntawv, ib los yog ntau tshaj ntawm cov xwm txheej hauv qab no feem ntau tshwm sim, xws li rheology ntawm polymers thiab kev hloov ntawm lub cev thiab tshuaj, uas feem ntau yog yus muaj los ntawm cov nram qab no zog:
1. Fluidity: Lub fluidity ntawm thermoplastics feem ntau yuav txiav txim tau los ntawm ib tug series ntawm indices xws li molecular luj, yaj index, Archimedes kauv ntws ntev, pom meej viscosity thiab txaus ratio (txheej txheem ntev / yas phab ntsa thickness).tsom xam.
2. Crystallinity: Qhov tshwm sim hu ua crystallization yog hais txog qhov tshwm sim uas cov molecules ntawm cov yas hloov pauv los ntawm kev txav mus los ntawm kev ywj pheej thiab kev tsis sib haum xeeb tag nrho rau cov molecules nres dawb txav thiab tau teem caij rau hauv ib qho chaw ruaj me ntsis los ua ib qho qauv ntawm cov qauv ntawm cov molten. xeev mus rau lub condensation.
3. Thaum tshav kub kub rhiab heev: Thaum tshav kub kub rhiab heev txhais tau hais tias ib co plastics yog rhiab heev rau cua sov.Thaum lub sij hawm cua sov yog qhov ntev ntawm qhov kub thiab txias los yog cov nyhuv shearing loj, qhov kub ntawm cov khoom yuav nce thiab nws yog feem ntau rau discoloration thiab decomposition.Thaum tshav kub-rhiab plastics yog decomposed, by-products xws li monomers, gases, thiab solids yog tsim.Tshwj xeeb, qee cov roj decomposed ua rau khaus, corrosive lossis lom rau tib neeg lub cev, khoom siv, thiab pwm.
4. Ib qho yooj yim hydrolysis: Txawm tias qee cov yas tsuas muaj cov dej me me xwb, lawv yuav decompose nyob rau hauv qhov kub thiab txias, siab siab, thiab cov cuab yeej no hu ua hydrolysis yooj yim.Cov yas no (xws li polycarbonate) yuav tsum tau preheated thiab qhuav
5. Kev ntxhov siab tawg: Qee cov yas muaj kev ntxhov siab, thiab ua rau muaj kev ntxhov siab sab hauv thaum lub sij hawm molding, uas yog nkig thiab yooj yim tawg, los yog cov khoom yas tawg nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam los yog hnyav.Qhov tshwm sim no hu ua kev ntxhov siab tawg.
6. Melt tawg: Lub polymer yaj nrog ib tug tej yam txaus tus nqi kis tau los ntawm lub nozzle qhov ntawm qhov kub thiab txias.Thaum tus nqi ntws ntau tshaj ib qho nqi, pom tseeb transverse kab nrib pleb tshwm sim nyob rau hauv melt nto, uas yog hu ua melt fracture.Thaum lub melt flow rate raug xaiv Thaum tsim cov khoom zoo yas raw khoom, lub nozzles, runners, thiab feed ports yuav tsum tau loj kom txo tau qhov kev txhaj tshuaj ceev thiab siab, thiab nce cov khoom kub.
Cov ntaub ntawv
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Post lub sij hawm: Jun-18-2022