Dab tsi ua rau viscosity nyob rau hauv cov tshuaj tsuag tshuab ziab khaub ncaws... Yuav ua li cas tswj
Cov ntsiab lus:
Cov khoom noj tshuaj tsuag qhuav tau muab faib ua ob pawg: tsis nplaum thiab khov. Cov khoom xyaw uas tsis yog nplaum yog ib qho yooj yim tshuaj tsuag qhuav, yooj yim tshuab ziab khaub ncaws thiab zaum kawg hmoov ntws dawb do. Piv txwv ntawm cov ntaub ntawv uas tsis yog nplaum muaj xws li qe hmoov, mis nyuj hmoov, kev daws teeb meem thiab lwm yam maltodextrin, cov pos hniav thiab cov protein. Nyob rau hauv cov ntaub ntawv ntawm cov khoom noj nplaum, muaj teeb meem ziab nyob rau hauv ib txwm tshuaj tsuag kom qhuav. Cov khoom noj nplaum feem ntau yog nyob rau ntawm phab ntsa ntawm lub tshuab ziab khaub ncaws, los yog ua cov khoom noj uas tsis muaj qab hau nyob rau hauv lub tshuab ziab khaub ncaws thiab kev thauj mus los, muaj teeb meem kev ua haujlwm tsawg thiab cov khoom lag luam tawm. Cov khoom noj qab zib thiab cov kua qaub yog cov piv txwv zoo.
Viscos yog qhov tshwm sim tshwm sim hauv cov txheej txheem ziab ntawm cov khoom noj khoom haus nplua nuj hauv glycolic acid. Hmoov viscosity yog ib hom cohesion adhesion kev ua tau zoo. Nws tuaj yeem piav qhia particle-particle viscosity (cohesion) thiab particle-wall viscosity (adhesion). Kev ntsuas ntawm kev sib khi quab yuam nrog cov hmoov hmoov yog vim nws cov yam ntxwv sab hauv hu ua cohesion, tsim cov khoom loj hauv cov hmoov txaj. Yog li ntawd, lub zog uas yuav tsum tau tawg los ntawm cov hmoov agglomerate yuav tsum muaj ntau tshaj qhov cohesion. Adhesion yog ib qho kev ua haujlwm sib cuam tshuam, thiab cov hmoov hmoov ua raws li cov khoom siv tshuaj tsuag kom qhuav. Cohesion thiab adhesion yog qhov tseem ceeb ntawm kev tsim kom qhuav thiab ziab khaub ncaws. Lub nto muaj pes tsawg leeg ntawm cov hmoov hais yog lub luag hauj lwm rau viscosity. Lub cohesion thiab adhesion nyiam ntawm hmoov particle nto cov ntaub ntawv yog txawv. Vim tias ziab kom qhuav yuav tsum muaj ntau npaum li cas ntawm cov kua xa mus rau qhov chaw particle, nws yog nyob rau hauv ntau. Ob tug yam ntxwv viscosity (cohesion thiab adhesion) tuaj yeem sib koom ua ke hauv cov khoom noj khoom haus uas muaj suab thaj ntau. Lub viscosity ntawm cov khoom yog tsim cov kav dej ruaj khov, txav cov kav dej ua kua, cov khoom sib txuas ntawm cov molecules, thiab electrostatic gravity thiab khoom txuas hniav. Lub ntsiab yog vim li cas rau lub adhesion ntawm phab ntsa hmoov hais nyob rau hauv lub drying chamber yog poob ntawm cov ntaub ntawv nyob rau hauv cov tshuaj tsuag-qhuav suab thaj thiab acid-nplua nuj zaub mov. Thaum cov hmoov khaws cia ntev dua, nws yuav qhuav rau ntawm phab ntsa.
Nws ua rau viscous
Sthov Vajtswv-nplua nuj zaub mov kom qhuav hmoov rov siv tshuaj tsuag ziab tshuab. Cov piam thaj qis molecular hnyav yog qhov nyuaj heev (glucose, fructose) thiab cov organic acids (citric acid, malic acid, tartaric acid). Cov khoom me me xws li kev nqus dej siab, thermoplasticity thiab qis vitrification hloov pauv kub (Tg) ua rau muaj teeb meem viscosity. Cov tshuaj tsuag kom qhuav kub yog siab dua Tg20°C. Feem ntau ntawm cov khoom no tsim cov khoom me me ntawm cov nplaum nplaum, ua rau cov hmoov viscosity, thiab nws thiaj li tsim cov qauv muab tshuaj txhuam tsis yog hmoov. Qhov siab molecular txav ntawm cov molecule no yog vim nws qhov tsis tshua muaj vitrification hloov pauv kub (Tg), uas ua rau muaj teeb meem viscosity hauv cov tshuab ziab khaub ncaws uas feem ntau nrov ntawm qhov kub thiab txias. Cov yam ntxwv tseem ceeb ntawm iav hloov pauv kub thiab amorphous theem hloov pauv kub. Cov iav hloov pauv tau tshwm sim hauv cov khoom tawv tawv, amorphous qab zib, uas tau hloov mus rau hauv cov kua roj hmab muag muag. Lub zog saum npoo thiab cov iav khoom muaj lub zog qis thiab tsis ua raws li cov khoom siv hluav taws xob tsawg. Vim lub xeev ntawm iav rau roj hmab ferry (los yog kua), qhov saum npoo ntawm cov khoom tuaj yeem raug tsa, thiab kev sib cuam tshuam ntawm cov molecule thiab cov khoom nto tuaj yeem pib. Hauv kev ua zaub mov kom qhuav, cov khoom yog nyob rau hauv lub xeev ua kua los yog nplaum, thiab cov kua / nplaum cov khoom noj uas tshem cov yas (dej) ua iav. Yog tias cov khoom siv raw khoom tsis hloov pauv los ntawm qhov kub kom qhuav ntau dua li qhov kub thiab txias, cov khoom yuav tuav lub zog viscosity siab. Yog tias cov khoom noj zoo li no tau kov nrog lub zog siab, nws yuav lo los yog ua raws li nws.
Tswj viscosity
Muaj ntau ntau cov ntaub ntawv tshawb fawb thiab cov txheej txheem raws li txoj hauv kev los txo cov viscosity. Cov txheej txheem yooj yim ntawm cov ntaub ntawv tshawb fawb suav nrog cov ntaub ntawv uas muaj qhov hnyav molecular hnyav ua kua kom qhuav ntxiv kom qhov kub thiab txias sab nraud vitrification hloov dua siab tshiab, thiab cov txheej txheem raws li cov txheej txheem suav nrog cov phab ntsa thiab hauv qab ntawm lub tshuab tshuab chamber.
Post lub sij hawm: Feb-22-2024