A look inside the line: forming, welding, vacuum, finishing, decoration and packing.
This guide shows how a vacuum flask moves through the Jupeng production line. The chosen material, construction and approved sample remain with the order through these stages.
The vacuum flask production line at Jupeng, Yongkang
1. Forming the Bodies
Stainless tube is formed into the inner and outer bodies, with the neck and base shaped for the selected model. The material and dimensions are kept with the product and quotation.
Metal forming & drawing — how a stainless bottle body is made
2. Welding Inner and Outer
The inner and outer bodies are joined at the mouth as part of forming the sealed vacuum body. The model and production reference determine the selected arrangement.
3. Drawing the Vacuum
Air is drawn out from the space between the walls and the port is sealed, creating the vacuum cavity. We can show the relevant production steps for your selected body.
4. Insulation Testing
The vacuum bodies are checked before coating and assembly, so anything needing attention can be addressed while the order is still in production.
5. Coating and Finishing
Bodies are cleaned and then coated — spray paint, powder coat or electroplating — and cured. Colour matching and even coverage are checked against the approved sample.
Coating and finishing — colour matched to the approved sample
6. Branding, Assembly and QC
The selected logo is applied, lids and accessories are assembled, and the finished piece is compared with the approved reference before packing. If your order needs an inspection, share the plan early so it can be coordinated with the schedule.
The body, assembly, finish and decoration are planned around the selected model. We keep the approved sample and artwork as the references through production.
We can discuss a photo or video walkthrough or your appointed inspection with the order. The applicable minimum depends on the selected model, colour and decoration.
Frequently asked questions
When are vacuum-body checks carried out in the process?▾
The process described here checks the vacuum body before coating and assembly. The order reference and agreed inspection plan define which checks apply to the selected model and production run.
Which production stages should I review for a vacuum flask?▾
The process includes forming the inner and outer bodies, joining them, creating and sealing the vacuum space, then finishing and assembly. The selected model determines the applicable construction details.
What happens when the inner and outer bottle bodies are formed?▾
The stainless-steel tube is formed into the inner and outer bodies, with the neck and base shaped for the model. Confirm the material and dimensions from the selected model specification.
How is the vacuum space created in a double-wall flask?▾
Air is removed from the cavity between the inner and outer walls and the opening is sealed. Check the selected model's stated construction; double-wall alone does not establish vacuum insulation.
When should the flask body finish and colour be approved?▾
Review the selected exterior finish, colour reference and logo together on the proof or sample. Keep the approved references with the model and packing details before confirming the order.
What should accompany a heat-retention result for a flask?▾
Record the model, capacity, starting temperature, fill level, ambient temperature, elapsed time and lid position with any result. Compare results only when the stated test conditions are clear.
How is the vacuum created between walls in stainless steel vacuum flask manufacturing?▾
After hydroforming or deep-drawing the inner SUS 304/316 liner and outer shell and welding them at the neck, flasks enter a high-temperature vacuum brazing furnace (~500 °C) where air is evacuated from the inter-wall gap and the bottom evacuation port is hermetically sealed, followed by 100% thermal retention testing before coating.
Which sales representative should I contact for samples, mock-ups or a quotation on this topic?▾
All four sales representatives — Beyond Lee, Miya Wu, Candy Tang and Shally Zhang — welcome global buyers in English and take part in our internal service competition to provide the most attentive follow-up. Choose Miya, Candy or Shally and Sales Manager Beyond Lee supervises the full order process from sample to shipment; choose Beyond Lee and a dedicated assistant works alongside him to co-follow your order. Each contact serves global buyers in English first and is also particularly familiar with specific order types and regional markets: Beyond Lee for custom development, logo options and new tooling; Miya Wu for supermarket, retail, online/FBA and brand orders (esp. Europe, Russia & CIS); Candy Tang for promotional gift campaigns and multi-item sets (esp. the US & Canada, Spain & Latin America, Oceania and select African markets); and Shally Zhang for volume orders, container scheduling and incoming accessory checks (esp. Brazil & Portugal, Southeast Asia and the Middle East).
Share the model or product type, quantity, colours, logo and packing you have in mind. We’ll confirm the applicable minimum, sample plan and production schedule for that specific order, then help compare delivery options for your destination.
Written by the Jupeng Drinkware team — Yongkang, Zhejiang, China. Manufacturing drinkware since 1998. Contact Beyond: [email protected] | WhatsApp +86 156 5791 8881
