How vacuum insulated thermal bottle flask made?

1. choose right spec, especially thickness of stainless steel tube material
2. “cutting” stainless steel tube to right dimension
3. “molding” stainless steel tube to design shape, outer wall body, inner wall body
4. “molding” screw on inner wall body or outer wall body
5. “cleaning with ultrasonic”
6. “copper lining” on inner wall body for better heat/cold retention “15%”
7. “welding” on mouth and bottom to create a double wall bottle
8. “welding” getter on inner wall body for long term vacuum insulation
9. “vacuum process” inside the vacuum machine, and test vacuum insulation 100%
10. “electrolysis” for creating a layer on inner of bottle to prevent rust
11. “polishing” on outer wall of bottle
12. vacuum test 100%
13. painting, powder coating, water-transfer, printing, laser etc.
14. assembly with cap and packaging
15. final pre-shipment inspection

Above is main processes for manufacturing a stainless steel double wall vacuum insulated thermal bottle flask, with good heat retention “hot 12H/cold 24H”, 100% leak proof, 100% food grade.

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