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A source manufacturer integrating design, R&D, production and sales
Short new release cycle
To stand out, we have a team of experienced designers and market observers who continuously develop original samples that push the boundaries of innovation and uniqueness. This commitment to creativity and excellence sets us apart and keeps us ahead of the competition.
Mold processing
Brand OEM
We provide customized solutions and expert material sourcing to meet your specific manufacturing needs and effectively relieve production pressures. Our goal is to consistently deliver high-quality results efficiently, enabling you to concentrate on essential business aspects while we expertly manage production intricacies.
Edge processing
Spot guarantee
With over 1 million items in stock, we use multi-level quality inspection to ensure thorough inspection and precise outbound delivery. Our comprehensive quality control measures ensure that every product leaving our factory meets the highest standards.
Warehouse of more than 2,000 square meters
After-sales guarantee
Any issues such as delayed shipping, product quality problems affecting function and causing business damage, discrepancies in received quantity, or mismatches with the agreed product details will result in a 1% refund of the total order amount.
Purchase with confidence
Manufacturing Process of Vacuum Insulated Stainless Steel Bottles
OEM Water Bottle Production Process
Brief description: Stainless steel arrives at the factory in the form of pines and sheets –> Produce outer bottle and inner bottle –> Assembly and welding –> Vacuuming –> Decorating.
1. Manufacture Outer Bottle
1.1 Pipe Cutting: Cut stainless steel pipes to appropriate lengths. 1.2 Expansion: Utilize two methods for manufacturing stainless steel bottles: water expansion and stretching. Water Expansion: Place stainless steel pipes onto a water expansion machine, shaping them into bottles under water pressure. A round stainless steel plate is welded onto the bottom to complete the bottle. Stretching: Cut stainless steel sheets into round plates, then use a punch press to stretch them into cylinders with bottoms. Water expansion is more common. 1.3 Separation: Necessary if using water expansion method. 1.4 Shaping: Use a large press to shape the outer bottle according to the Bottle Shaping Guide. 1.5 Necking: Machine press the upper part of the bottle to form the neck. 1.6 Thread Making: Manufacture threads with a special threading machine. 1.7 Cleaning: Remove lubricating oil and dust during molding. 1.8 Inspection: Perform product inspection.
2. Manufacture Inner Bottle
2.1 Pipe cutting: Cut raw material – stainless steel pipe – to the appropriate length. 2.2 Expansion. Water expansion or stretch. The inner bottle can be formed by any of these two methods. Water expansion is more popular. 2.3 Separating 2.4 Shaping 2.5 Necking 2.6 Thread Rolling/Making (Normally if outer bottle is designed with thread, there’s no thread on inner bottle) 2.7 Cleaning
3. Assembly (Bottle Mouth Matching)
Assemble the inner bottle and the outer bottle together by pressing machine.
4. Bottle Bottom Assembly
Assemble the bottom to the bottle by pressing machine.
5. Assembly (Bottle Mouth Welding)
Weld the inner bottle and outer bottle together to prepare for vacuum insulation. Ensure smoothness, no bumps or solder joints.
6. Assembly (Bottle Bottom Welding)
Weld the outer bottle and the bottle bottom to prepare for vacuum insulation. Ensure smoothness, no bumps or solder joints.
7. Leaking Test
Check whether inner bottle and outer bottle were well welded.
8. Vacuuming
Vacuuming with a vacuum machine.
9. Temperature Test / Insulation Test
Blow hot air into each bottle. If the outside of the bottle is kept cool, it means that the heat from the hot air will not be diverted and the bottle is vacuum insulated. On the contrary, if the bottle gets hot, there is a problem with vacuum insulation.
10. Electrolysis Polishing
Through the interaction of current and electrolyte to improve the micro-geometry of the metal surface, reduce the surface roughness of the metal, so as to achieve the purpose of bright and smooth surface of the stainless steel bottle. Surface of inner bottle to be bright and even, no watermark, yellow dot.
11. Mechanical Polishing
Polish the surface of outer bottle to ensure it is smooth and bottle mouth is smooth and bright. There must be no obvious drawing, scratching, black wire and pits.
12. Cleaning
Clean the bottle and dry it. Make the bottle ready for external coating / decorating.
13. External Coating
The bottle is now ready for external coating –powder coating or spray painting. Doyoung is capable of doing both spray printing and powder coating process.
14.Production to Packaging
Pattern and logo printing involves applying designs and logos using techniques like screen printing, thermal transfer printing, water transfer printing, and laser etching. After inspecting each bottle for visual defects and conducting lid leak tests, they are individually bagged for packaging.
How Do We Control The Quality Of Doyoung's Products?
Quality control is the most important part in the production process of water bottles. Doyoung pay great attention to quality control, We have more than 20 quality inspectors. we check each shipment that will sell to all over the world.
All the packed parcel will be put in the warehouse, we will casually pick 80-500pcs from 500-150000pcs finished products based on International inspection standard. Then start data/measurement inspection, product inspection, material inspection, paint adhesion test, leak test and insulation inspection.
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