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

#VacuumFlask #ThermosFlask #MiltonFlask #CelloFlask #VacuumInsulatedFlask

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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=== 1 Liter ===
Cello Swift Stainless Steel Vacuum Insulated Flask 1000ml
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=== 1 Liter ===
Cello Flipstyle Stainless Steel Vacuum Insulated Flask 1000ml
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=== 1.1 Liter ===
Milton Prudent 1100 Thermosteel
Amazon https://amzn.to/41NC5bF
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=== 850 ml ===
Borosil Stainless Steel Hydra Trek - Vacuum Insulated Flask Water Bottle, 850 ML
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=== 750 ml ===
Prestige Thermopro Vacuum PWSL 3 Water Bottle 750ml, Silver
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=== 500 ml ===
Amazon Milton Thermosteel Flip Lid Flask, 500 milliliters, Silver
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=== 420 ml ===
Milton Optima 420 Thermosteel Hot and Cold Flask
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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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