Video narration
Kya milk powder banane ke liye poori tanki ka doodh dheere-dheere ubaalkar sukhaya jata hai? Nahin. Pehle doodh ko taiyar karke uska kuch paani hataaya jata hai, taaki woh gaadha ho jaaye aur dryer ko kam paani sukhana pade. Phir yeh gaadha doodh spray dryer mein jaata hai. Iska atomizer, yaani bareek fuhaar banane wala hissa, doodh ko laakhon chhoti boondon mein tod deta hai, theek jaise spray bottle taral ko mist mein badalti hai. Yahin badlaav hota hai: bade bartan ko garam karne ke bajaay, chhoti boondon ko hot air ke sampark mein laaya jaata hai. Har boond paani ko hawa ke saamne zyada satah deti hai, isliye paani tezi se bhaap bankar nikalta hai. Hawa garam hoti hai, lekin doodh usi taapmaan tak nahin pahunchta. Sukhne par boond ke milk solids kan ban jaate hain. Yeh kan hawa se alag hokar ikattha kiye jaate hain, yahi milk powder hai. Toh poori tanki nahin ubalti: gaadhe doodh ki boonden hot air mein seconds mein sookh jaati hain.