IIYuav Ua Li Cas
Cov ntaub ntawv
Kev ua ib qhokhob dej khov nab kuab kev caipib nrog raukev xaiv cov khoom siv rawPeb xaivqib zaub mov zoocov khoom yas lossis ntawv ua cov khoom siv raw kom ntseeg tau tias cov khoom muaj kev nyab xeeb thiab kev tiv thaiv ib puag ncig. Cov khoom siv raw no raug tshuaj xyuas nruj me ntsis thiab ua tau raws li lub teb chaws thiabcov qauv thoob ntiaj teb, yog li ntawd cov neeg siv khoom tuaj yeem txaus siab rau cov dej khov qab tib lub sijhawm, tab sis kuj so kom paub tseeb tias lawv tuaj yeem siv.
Cov khoom siv raw ntawmcov khob ntawv luam tawmfeem ntau cuam tshuam rau nwskev ruaj khov thiab kev nyab xeebPiv txwv li, qee lub khob ntawv siv cov roj hmab paraffin uas yog cov khoom noj khoom haus ua ib txheej, uas hu ua khob roj hmab. Txawm li cas los xij, vim tias qhov chaw yaj ntawm cov roj hmab paraffin qis, nws yooj yim yaj hauv dej kub, thiab nws yooj yim ua kom tawv thiab tawg ntawm qhov kub qis, yog li lub khob roj hmab feem ntau tsuas yog haum rau cov dej haus txias. Lub khob coated siv polyethylene (PE) ua txheej, vim tias polyethylene muaj zog tiv taus cua sov, lub khob ntawv no tuaj yeem siv los tuav cov dej haus kub, tab sis kuj tuaj yeem tuav cov dej haus txias lossis ice cream.
Tsis tas li ntawd xwb, cov khoom siv ntawm lub khob ntawv kuj tseem yuav cuam tshuam rau nwskev ua haujlwm rwb thaiv tsev kubCov khob ntawv siv rau cov dej haus kub feem ntau yog ua los ntawm cov ntaub ntawv tuab uas tiv taus qhov kub siab thiab tej zaum yuav ntxiv nrog ib txheej ntawm emulsion lossis lwm yam txheej los txhim kho kev rwb thaiv tsev. Tus qauv tsim no ua kom lub thawv tsis deform lossis ntub thaum raug rau qhov kub siab, yog li zoo dua tswj qhov kub ntawm cov dej haus thiab tiv thaiv kev kub hnyiab.
Intsos, cov ntaub ntawv sib txawv ntawmcov khob dej khov nab kuab uas muaj tus kheejkuj txawv. Cov khob uas muaj txheej feem ntau muaj qhov chaw du dua, thaum cov khob uas muaj roj hmab yuav muaj qhov sib txawv me ntsis vim muaj txheej roj hmab.
Yuav tsum nco ntsoov tias txawm hais tias cov khob ntawv no txawv ntawm cov khoom siv, lawv yog cov khoom siv pov tseg, tsim nyog rau cov chaw pej xeem, tsev noj mov, tsev noj mov thiab lwm qhov chaw. Thaum xaiv covkhob dej khov zoo tshaj plaws, ntxiv rau kev xav txog nws cov khoom siv thiab kev ua tau zoo, nws kuj yuav tsum tau them sai sai rau nws covchaw tsim khoom thiab qhov zoo ntawm cov khoomkom ntseeg tau tias yuav cov khoom muaj kev nyab xeeb thiab huv.
