Vacuum Extraction Process for Stainless Steel Insulated Bottles
In this stage, you’re entering the most critical part of insulated bottle manufacturing — the vacuum extraction process. Whether a bottle can truly maintain temperature depends entirely on how well its vacuum layer is formed. This is the step that defines real insulation performance.
Preparing Bottles for Vacuum Processing
Your bottles arrive from the welding line with the inner and outer shells already sealed. Workers place each bottle upside down in neat rows, ensuring alignment and stability. Anti-oil solder is added into the reserved bottom hole of the outer base — this material is essential for sealing the vacuum layer later in the furnace.
Six-Hour High-Temperature Vacuum Furnace
Once prepared, the bottles are pushed into the vacuum furnace.
Inside the furnace:
The duration is about 6 hours
Temperature gradually rises to 550°C
Heat and pressure draw out and dilute the air trapped between the inner and outer walls
The interlayer transitions into a true vacuum, which is what locks temperature inside the bottle
This long heating cycle ensures the vacuum layer is both stable and durable, preventing future insulation failures.
Cooling and Temperature Testing
After around 7 hours of heating and cooling, the bottles come out for performance verification. Workers place each bottle on a temperature-testing machine with the bottle mouth facing downward.
The testing machine:
Applies a ~300°C hot-air spray
Duration: 45 seconds
Measures how the bottle body reacts to thermal stress
If the bottle’s exterior becomes hot during this process, it means the vacuum layer is compromised — and the product is classified as defective. Only bottles that remain cool under this extreme test pass to the next stage.
Ready for Further Processing
Once the vacuum layer is confirmed stable, the bottles move on to electrolyte cleaning to remove internal residues — another key step to ensure hygiene and product quality.
Follow each step to see how we produce stainless steel insulated bottles from raw materials to finished products.
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