What is stainless steel vacuum flask?
It is double walls stainless steel 18-8 (outer wall & inner wall) with vacuum insulated layer which can keep water hot 12 hours up and ice cold 24 hours up in different environment or places, with an additional copper shield for enhancing heat retention performance 15 ~ 30% to keep your drinking hot or colder longer.
How do stainless steel vacuum insulated flask works to keep cold?
There’s a vacuum insulated layer between the double walls stainless steel of the vacuum insulated flask, it was made by vacuum technique to eliminate the air to create the vacuum sealed layer, because the heat can not be transfer without air, the vacuum layer can stop heat flow from inside to outside and from outside to inside to keeps liquid (water, beer, coffee, wine etc.) hot and cold.
How to make stainless steel vacuum flask?
Custom design processes
- Custom design a new structure shape & function stainless steel vacuum flask, our R&D engineer team can support your product team to complete a custom design from concept, sketch drawing, image, or sample to have final CAD drawing to make prototype sample for design reviewing, custom tooling development, trial run production & test, to mass production to ship.
- A new custom graphic printing or logo design, we can work out with your AI. format artwork document with different technique for custom decoration for your stainless steel vacuum flask sample and products.
- Custom color or surface finishing
- Custom packing
The raw materials of stainless steel vacuum flask
- Body: kitchen food grade stainless steel 18-8, SUS 304, SUS 316, all stainless steel must be comply with food grade regulation in EU/USA/CA/AU/CN markets, also have good corrosion prevention.
- Cap/Lid: plastic 5# Polypropylene or Eastman Tritan made, must be BPA Free, non-toxic, 100% food grade FDA/LFGB comply, dishwasher safe, microwave safe.
- Sealing: silicone made gasket sealing, must be BPA Free, non-toxic, 100% food grade FDA/LFGB comply, dishwasher safe, microwave safe.
How to make a better heat retention vacuum insulated bottle?
- A smaller width of the water bottle, less heat can go through of the smaller mouth opening can have better heat retention.
- Double walls design with a poly foam inside can improve heat retention by prevent heat go through of the cap/lid of the vacuum insulated bottle.
- A copper coating layer on the inner wall of the stainless steel insulated bottle can enhance heat retention by lock the heat inside of the bottle
- A bigger volume bottle can have better heat retention than a smaller one due to it has more heat inside the vacuum insulated bottle.
Production manufacturing processes
- Purchase raw material
- Cutting stainless steel tube
- Shape forming with water swelling ( or deep drawing forming)
- Cutting into 2 pieces
- Mouth forming with threads
- Matching and welding the mouth of stainless steel flask (the out wall and inner wall join together then do Laser welding)
- Welding the bottom cap and with an attachment of Getter
- Vacuum process inside the vacuum machine around 4 hours to create vacuum insulated layer between the double walls stainless steel
- Vacuum Test (measure the stainless steel vacuum flask is good quality or faulty on vacuum insulation) 100%
- Electrolysis for the inside of the stainless steel vacuum insulated flask (it can clean the dirty to have nice surface, also create a layer on the inner surface to have good corrosion prevention)
- Inspection of electrolysis quality 100%
- Polishing the surface of outer wall of the stainless steel insulated flask
- Inspection of Polishing quality 100%
- Vacuum insulation test 100% second time
- Decoration (spray painting, powder coating, water transfer painting, heat transfer printing, logo printing or laser engraving etc.)
- Assembly with caps, cleaning, inspection, packaging
- Out going final QC inspection
What Ecoway Does?
Ecoway Houseware Limited is a professional China OEM/ODM manufacturer factory for different stainless steel insulated vacuum flask water bottle tumbler products from concept design, tooling development, to final shipment for global customers with fast delivery and high quality products & services, your one stop sourcing supplier and trusted business partner from set up business for a long term cooperation relationship, welcome to reach us for more information.