Siv lub tshuab ntsug txhaj tshuaj molding tshuab thermocouple rau kev ntsuas qhov kub thiab txias raws li qhov ntsuas qhov ntsuas kub, thiab ntxiv ib millivolt meter rau qhov ntsuas kub zoo, nws dhau los ua ntsug txhaj tshuaj molding tshuab kub tswj tshuab. Nws ua haujlwm ntawm kev ua haujlwm ntawm kev tig ntws ntawm cov khoom ntim thiab cov pwm, thiab muaj peev xwm xaiv qhov kub thiab txias ntawm txhua ntu ntawm cov khoom thoob thiab pwm. Qhov ntsuas kub uas lub tshuab txhaj tshuaj ntsug yuav tsum tswj tau thaum lub sijhawm txhaj tshuaj molding muaj xws li qhov kub thiab txias, qhov kub ntawm lub taub hau, thiab pwm kub. Thawj ob qhov kub thiab txias muaj qhov cuam tshuam loj rau cov yas thiab cov dej ntws ntawm cov yas, thaum lub sij hawm tom qab kub muaj qhov cuam tshuam loj rau cov dej ntws thiab txias ntawm cov yas.
1. Vertical txhaj tshuaj molding tshuab chim kub
Kev xaiv ntawm cov khoom kub kub rau ntsug txhaj tshuaj molding tshuab muaj feem xyuam rau cov yam ntxwv ntawm cov yas, tshwj xeeb tshaj yog cov fluidity kub (Tf) los yog melting point kub (TM) ntawm plastics. Rau cov yas amorphous, qhov kub ntawm qhov kawg ntawm lub thoob yuav tsum siab tshaj Tf, thaum crystalline yas yuav tsum siab tshaj Tm, tab sis qhov kub ntawm cov yas yuav tsum qis dua qhov kub dissolution (Td) ntawm cov polymer. Yog li ntawd, qhov kub zoo rau lub thoob yuav tsum nyob nruab nrab ntawm Tf lossis Tm - Td. Rau cov yas uas muaj qhov nqaim Tf lossis Tm Td ntau yam, xws li polyvinyl chloride thiab paraformaldehyde, lub chim kub yuav tsum tau tswj nyob rau theem qis me ntsis, thaum rau cov yas uas muaj qhov dav Tf lossis Tm Td ntau yam, xws li polyethylene thiab polypropylene, lub thoob. kub tuaj yeem siab dua me ntsis. Tsis tas li ntawd, qhov cuam tshuam ntawm kev ua haujlwm kub, cov ntsiab lus thiab kev faib tawm ntawm cov yas, cov khoom ntim, thiab cov khoom siv ntxiv, cov khoom siv tes ua, cov pwm txhaj tshuaj, thiab cov khoom siv txhaj tshuaj yuav tsum tau txiav txim siab. Kev faib tawm ntawm cov khoom ntim khoom ruaj khov, thiab cov khoom ntim cov khoom maj mam nce ntawm lub nozzle mus rau qhov kawg, kom ntseeg tau tias qhov kub thiab txias ntawm cov khoom siv raw thiab ua kom muaj kev sib haum xeeb.
2. Vertical txhaj tshuaj molding tshuab nozzle kub
Vim lub fact tias thaum cov tshuaj yog raws li nyob rau hauv lub nozzle, cov khoom kub yuav nce nrog rau qhov nce ntawm txiav ceev (txog 103-102), thiab lub nozzle kub yog me ntsis qis dua qhov kub ntawm cov khoom chim. Txawm li cas los xij, yog tias qhov ntsuas kub tsawg dhau, qhov kev txhaj tshuaj ua haujlwm siab yuav nce ntxiv, lossis cov khoom siv raw yuav ruaj khov ua ntej, yog li cuam tshuam rau qhov zoo ntawm cov khoom siv tes ua. Vim muaj ntau yam uas cuam tshuam rau fluidity ntawm polymers, kev hloov kho feem ntau yog ua raws li "kev txhaj tshuaj huab cua" lossis "kev tsom xam pom kev rau kev kos duab" ua ntej molding los txiav txim siab qhov kub thiab txias ntawm lub tshuab txhaj tshuaj ntsug.
3. Vertical txhaj tshuaj molding tshuab pwm kub
Qhov kub ntawm cov pwm muaj feem cuam tshuam rau qhov zoo ntawm cov khoom siv tes ua, thiab nws cov kev xaiv nyob ntawm seb cov polymer crystallizes, specifications thiab qauv ntawm cov khoom siv tes ua, specifications ntawm cov yam ntxwv, thiab lwm yam kev txhaj tshuaj qauv (kev daws teeb meem, txhaj tshuaj thiab ua hauj lwm siab, molding voj voog). Rau amorphous polymers, pwm kub muaj qhov cuam tshuam loj rau cov viscosity (fluidity) ntawm cov tshuaj. Yog tias cov viscosity ntawm cov khoom siv raw cov ntsiab lus yog tsawg, xws li Ps, pwm kub tuaj yeem qis me ntsis kom nce ntau lawm. Yog tias qhov viscosity ntawm cov tshuaj yog siab (xws li mPPE, PSF), qhov kub ntawm pwm yog: mPPE yog 120 ° C ~ 140 ° C, thiab PSF yog 140 ° C ~ 130 ° C. Rau crystalline polymers, crystals tsis yog. isothermal nyob rau hauv ntsug txhaj molding tshuab. Hom kub ntawm lub ntsug txhaj tshuaj molding tshuab yuav tsum tau teem nyob rau hauv periphery ntawm qhov kub thiab txias (TCM) ntawm Tg thiab Tm, los yog me ntsis qis.
