Txau lub tshuab ziab khaub ncaws kom qhuav hauv qhov qub uas ua rau nplaum… Yuav ua li cas tswj

Txau lub tshuab ziab khaub ncaws kom qhuav hauv qhov qub uas ua rau nplaum… Yuav ua li cas tswj

Cov khoom noj tshuaj tsuag qhuav poob rau hauv ob pawg: tsis nplaum thiab nplaum. Cov khoom xyaw uas tsis yog nplaum yog ib qho yooj yim rau tshuaj tsuag qhuav nrog cov qauv siv tshuab ziab khaub ncaws yooj yim thiab cov hmoov uas tsis muaj dej kawg. Piv txwv ntawm cov khoom tsis muaj kuab xws li hmoov qe, hmoov mis, maltodextrins xws li tshuaj, cov pos hniav, thiab cov proteins. Nyob rau hauv cov ntaub ntawv ntawm cov khoom noj nplaum, muaj teeb meem qhuav nyob rau hauv ib txwm tshuaj tsuag kom qhuav tej yam kev mob. Cov khoom noj nplaum feem ntau lo rau ntawm phab ntsa tshuab ziab khaub ncaws los yog ua cov khoom noj uas tsis muaj qab hau nyob rau hauv cov chav ziab khaub ncaws thiab cov tsheb thauj mus los nrog cov teeb meem kev ua haujlwm thiab cov khoom lag luam qis. Qab zib thiab cov khoom noj uas muaj kua qaub yog cov piv txwv zoo.

Stickiness yog ib qho tshwm sim tshwm sim thaum ziab ntawm cov khoom noj uas muaj suab thaj- thiab acid-nplua nuj. Powder tack yog ib qho cuab yeej adhesion. Nws tuaj yeem piav qhia nyob rau hauv cov nqe lus ntawm particle-particle adhesion (cohesion) thiab particle-wall adhesion (adhesion). Kev ntsuas ntawm lub zog uas cov hmoov nplej khi yog vim nws cov khoom sab hauv hu ua cohesion, tsim cov pob hauv cov hmoov txaj. Yog li ntawd, lub zog yuav tsum tau tawg los ntawm cov hmoov agglomerates yuav tsum ntau dua li lub zog cohesive. Adhesion yog ib qho cuab yeej interfacial, qhov nyiam ntawm cov hmoov hmoov kom ua raws li cov phab ntsa ntawm cov khoom siv tshuaj tsuag kom qhuav. Lub cohesion thiab adhesion yog qhov tseem ceeb ntawm kev tsim kom qhuav thiab ziab khaub ncaws. Cov txheej txheem saum npoo ntawm cov hmoov yog feem ntau yog lub luag haujlwm rau qhov teeb meem adhesion. Lub cohesion thiab adhesion tendencies ntawm cov hmoov particle nto cov ntaub ntawv yog txawv. Vim tias ziab yuav tsum muaj ntau qhov hloov pauv mus rau qhov chaw particle, nws yog ntau. Qhov ob yam ntxwv viscous (cohesion thiab adhesion) tuaj yeem sib koom ua ke hauv cov khoom noj khoom haus uas muaj suab thaj ntau. Adhesion ntawm cov khoom yog cohesion yog tsim los ntawm cov kav dej ruaj khov, txav cov kav dej ua kua, cov khoom siv sib txuas ntawm cov molecules thiab electrostatic gravity thiab cov khoom txuas hniav. Nrog rau lub tshuab ziab khaub ncaws phab ntsa hmoov hmoov feem ntau yog vim cov khoom poob hauv cov tshuaj tsuag kom qhuav ntawm qab zib thiab cov khoom noj muaj kua qaub. Powdery khoom thaum khaws cia ntev dua nyob rau hauv phab ntsa kom qhuav poob.

Ua rau Sticking:

Txau Qab Zib thiab Acid Nplej Khoom Noj Kom Qhuav Powder Rov Qab Siv Cov Tshuab ziab khaub ncaws qhuav, cov suab thaj qis molecular (glucose, fructose) thiab cov organic acids (citric, malic, tartaric) yog qhov nyuaj heev. Kev nqus dej siab, thermoplasticity, thiab qis iav hloov pauv kub (Tg) cov molecules me no ua rau muaj teeb meem stickiness. Txau kom qhuav qhov kub siab tshaj Tg 20 ° C, cov khoom xyaw no feem ntau tsim cov khoom me me ntawm cov nplaum nplaum, ua rau cov hmoov lo thiab xaus nrog cov qauv zoo li cov hmoov nplej. Qhov siab molecular txav ntawm cov molecules no yog vim lawv qhov qis dua iav hloov pauv kub (Tg), uas ua rau muaj teeb meem stickiness ntawm qhov kub thiab txias feem ntau nrov hauv cov tshuab ziab khaub ncaws. Lub iav hloov pauv kub yog lub ntsiab yam ntxwv ntawm amorphous theem hloov pauv kub. Cov iav hloov pauv tshwm sim thaum cov khoom tawv tawv, amorphous qab zib, dhau los ua kev hloov pauv mus rau hauv cov mos mos rubbery, theem ua kua. Lub zog saum npoo, cov iav khoom muaj lub zog qis thiab tsis ua raws li cov khoom siv hluav taws xob tsawg. Raws li qhov tshwm sim ntawm kev hloov pauv ntawm lub khob iav mus rau lub xeev rubbery (los yog kua), cov khoom saum npoo tuaj yeem raug tsa, thiab cov molecular thiab cov khoom sib cuam tshuam tuaj yeem pib. Hauv kev ua zaub mov kom qhuav, cov khoom lag luam nyob hauv cov kua lossis cov khoom sib koom ua ke, thiab vim yog tshem tawm cov yas yas (dej) cov kua / cov khoom noj khoom haus ua rau lub xeev khov. Cov khoom noj khoom haus yuav nyob twj ywm siab zog yog tias cov khoom noj khoom haus tsis dhau qhov kev hloov pauv ntawm qhov kub kom qhuav dua li qhov hloov pauv ntawm qhov kub thiab txias. Yog tias cov khoom noj khoom haus no nyob rau hauv kev sib cuag nrog cov khoom nto nrog lub zog siab nws yuav lo los yog khi rau nws.

Tswj viscosity:

Muaj ntau cov ntaub ntawv tshawb fawb thiab cov txheej txheem raws li kev txo qis viscosity. Cov ntaub ntawv tshawb fawb raws li txoj hauv kev suav nrog cov khoom hnyav molecular hnyav cov khoom ua kua kom qhuav ntxiv kom nce qhov kub tshaj qhov hloov pauv iav, thiab cov txheej txheem raws li cov txheej txheem suav nrog phab ntsa, hauv qab, thiab lwm yam ntawm cov khoom siv tshuab.