Vacuum Thermos Flask Parts & Functions | Milton, Cello मिल्टन, सेलो वैक्यूम फ्लास्क के अंदर क्या है?

Vacuum Thermos Flask Parts & Functions | Milton, Cello मिल्टन, सेलो वैक्यूम फ्लास्क के अंदर क्या है?

Vacuum flask is constructed from Tube-in-Tube type construction, where vacuum is formed in between 2 tubes hence insulating the inner bottle from outside environment,
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My Affiliate inks for Checking product prices from Amazon

MADE IN INDIA Vacuum Flask - my recommendation
https://amzn.to/2Ybi1Qq Pexpo Ideale Flamingo Stainless Steel Vacuum Insulated Bottle Silver-500ml with Jute Bag

MADE IN CHINA Vacuum Flasks
https://amzn.to/2JvOnBk Cello Cool Mate Thermos Vacuum Steel 750ml Bottle
https://amzn.to/3lk9CDq Prestige Stainless Steel Water Bottle, 750 ml, Silver
https://amzn.to/33upop2 Milton Thermosteel Flip Lid Flask, 500 milliliters, Silver
https://bit.ly/3o4BsFO (Flipkart link for Milton Thermosteel Flip Lid 500 ml Flask)
https://amzn.to/2HTex0m Quechua Insulated Stainless Steel Hiking Flask MH500 0.8L - Blue
Please note that "DMart D-homes Vacuum Flask Double Stainless Steel" you need to goto local store, I could not find out link for online buying of this flask - this was the cheapest value for money flask in my view, I got it only for 300 Rs

Disclaimer - "As an Amazon Associate I earn from qualifying purchases."
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Heat transfer takes place due to conduction, convection and radiation. Vacuum inside bottle prevents Conduction and Convection, however it can not prevent Radiation.
Hence some manufacturers like Pexpo, Milton put Aluminum foil in between two layers thus preventing or reducing loss of heat transfer due to radiation.

In simple words I will try to explain the manufacturing process of a Vacuum thermosteel flask

Steps for manufacturing
- pipe cutting
- water bulging
- neck forming / shaping
- CNC threading
- mouth inner walls welding
- Removing air from gap in decompression chamber
- using glass beads on the micro hole which seals the micro hole used for decompression at 4500 deg centigrade (to melt the glass bead and seal the micro-hole)

How Vacuum Flask Work? What is inside a thermostel bottle?
By using vacuum as medium to isolate heat transfer in between inner and outer walls of flask

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