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Discover how we manage the full manufacturing process of stainless steel tumblers and thermoses—delivering your orders on time,
within budget, and with consistent quality, batch after batch.
Stainless Steel Inner & Outer Shell Production
We use food-grade 304 or 316 stainless steel tubes(selected for safety and durability). High-precision stamping machines shape the tubes into inner and outer shells, ensuring thickness (tolerance ≤ 0.05mm) for stable insulation. After forming, inner shells undergo electrolytic polishing to remove impurities, creating a smooth, odor-resistant surface that prevents beverage residue buildup.
Vacuum Processing
The vacuum process is the key to insulation performance. We seal the inner and outer shells using professional welding technology, then extra air from the interlayer with a high-efficiency vacuum pump—achieving a vacuum degree of over 10⁻³Pa. Getter materials are added to absorb residual gas, ensuring long-lasting insulation (no performance drop for years).
Lid & Stopper Manufacturing
Lids (for tumblers) and stoppers (for thermoses) are made from food-grade PP or Tritan via precision injection molding (using YIZUMI machines, tolerance ±0.01mm) for structural stability. Sealing gaskets are crafted from medical-grade silicone (high-temperature resistant, anti-aging) to ensure 100% leak-proof performance.
With all components ready, we follow strict assembly processes guided by product-specific BOM (Bill of Materials) sheets. Workers assemble inner/outer shells, attach lids/stoppers, and install accessories (straws, handles) step-by-step. Torque wrenches are used to control screw tightness—avoiding loose parts or damage that could affect user experience.
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Rigorous Quality Testing
•Insulation Test: Inject 95℃ hot water—tumblers retain heat for 12-24h (temp ≥ 60℃), thermoses for 24-48h (temp ≥ 70℃). Inject 0℃ ice water—both keep cold for 24-48h (temp ≤ 10℃).
•Leak Test: Invert products for 2 hours; apply 0.3MPa pressure to check sealing—no leakage allowed.
•Safety Test: Random samples undergo heavy metal migration testing, complying with national food contact standards (GB 4806) and international norms (FDA, LFGB).
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Protective Packaging
Qualified products are first wrapped in PE film to prevent scratches. They’re then packed into custom color boxes (printed with brand logos and product info) and placed into 5-layer corrugated cartons with foam buffers—protecting against collision during shipping. Logistics labels are attached for easy order tracking.
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Our professional manufacturing process for stainless steel tumblers and thermoses gives your brand a competitive edge. Whether you’re a new entrant or an established brand, we offer end-to-end support—from component sourcing to finished product delivery. Contact us today to start your production journey!
In the highly competitive stainless steel tumbler and thermos market, professional R&D and outstanding design are the core drivers of brand success. Our R&D team boasts over 20 years of industry experience and has obtained more than 80 patents in insulation technology, structural design, and user experience, focusing on crafting high-quality products.
We can transform your ideas into market-leading products. Professional manufacturing experience runs through the entire R&D process, ensuring the final result not only meets but exceeds your expectations.
"We break inherent thinking to create innovative and practical hydration solutions for users." — Daian Design Director
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Leveraging rich project experience, we strike a perfect balance between product appearance, practicality, durability, and comfort. Key details such as the hand-fitting cup curvature, the thickness of the insulation layer that affects heat retention, and weight distribution are carefully considered during the prototyping phase.
We have a self-built mold workshop equipped with advanced CNC machining equipment for high-precision mold manufacturing. This ensures seamless vacuum layer connection and excellent sealing performance, laying a solid foundation for mass production.
Core R&D Focuses:
•Mold Flexibility: Supports 12oz-40oz capacities, various styles, and quick parameter adjustments.
•Efficiency & Cost Control: Optimized processes shorten production cycles while effectively controlling costs.
•Structural Stability: Repeated tests ensure no leakage, deformation, or performance degradation.
Precise Specifications for Diverse Scenarios
We continuously optimize product specifications to adapt to different usage scenarios.
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