Top 5 Stainless Steel Coffee Mug Manufacturers in China

Leak Control Core

Leak prevention is achieved through mechanical interaction between lid and cup mouth:

• silicone gasket compression sealing under axial torque
• thread engagement locking to resist vibration loosening
• air pressure balance during hot filling cooling shrinkage

If gasket compression force drops after repeated cycles, leakage occurs at the lid-mouth interface. This is the most common rejection reason in retail returns.

Thermal Retention Structure

Heat retention depends on:

• SUS304 inner liner thickness (typically 0.4–0.6 mm range depending on design)
• vacuum layer stability (reducing conduction and convection)
• lid sealing integrity (primary heat loss path is the lid, not the wall)

In practical use: hot coffee at 90°C → 55–65°C after 4–6 hours depending on lid structure; ice drinks maintained below 10°C for 6–10 hours under sealed conditions.

Usage Scenarios 

Coffee mugs are tested in:

• office desk use (frequent opening cycles)
• vehicle cup holders (continuous vibration + tilt)
• travel bags (horizontal compression + leakage risk)

The key engineering requirement is multi-angle sealing stability under dynamic movement, not static performance.

Leak Control Mechanism

Leakage control is not based on tight fitting alone, but on controlled deformation sealing: torque applied during lid rotation generates axial compression force; silicone gasket expands radially to fill machining tolerance gaps; thread locking resists loosening under vibration in transport.

This structure is designed for: backpack transport (horizontal pressure load), vehicle vibration (continuous micro-shock), and repeated daily opening cycles (mechanical fatigue environment).