The core competitiveness of a high-quality thermal lunch tin box lies not only in its appearance design, but also in the sophisticated manufacturing processes behind every delicate procedure. From raw plate selection to finished product delivery, this thermal tin lunch box undergoes 36 refined production processes. It adopts strict process standards to consolidate three core advantages including food safety, heat retention and durability, perfectly catering to dining scenarios such as daily commuting, outdoor picnics and students’ meal carrying.

　　Raw material selection serves as the first line of defense of the whole craftsmanship. We abandon inferior ordinary iron sheets and select food-grade thick tinplate as the base material with a precise wall thickness of 0.35mm, which balances comfortable portable grip and excellent deformation resistance. All base materials pass dual heavy metal tests before production, and the precipitation of harmful substances such as lead and cadmium is far below national safety standards for food contact materials. No harmful substances will precipitate when contacting hot meals and soups directly, fully protecting your dietary safety. Besides, the plates are pre-hardened to prevent deformation and depression caused by long-term high-temperature application.

　　The integral stamping forming technology creates a seamless box body, completely solving the problems of soup leakage and rapid heat conduction of traditional spliced lunch boxes. Adopting high-precision numerical control molds for one-step deep drawing forming with a tolerance controlled within ±0.5mm, the inner wall has no splicing gaps to avoid bacteria breeding caused by residual food dirt. Compared with traditional riveting splicing technology, the integral forming structure improves the overall structural strength of the lunch box by 60%, resisting damage from daily bumps and drops and greatly prolonging its service life.

　　Dual-layer vacuum heat insulation and precise edge sealing processes realize long-term constant temperature heat preservation. Designed with a double-layer hollow heat insulation structure, the lunch box extracts air from the interlayer via a professional molecular pump and stably maintains the vacuum degree at 10⁻³Pa, blocking heat dissipation through both heat conduction and thermal convection. Equipped with laser seamless edge sealing technology with a weld width of only 0.3mm, the product achieves excellent air tightness and extremely low heat leakage rate. It can keep meals warm for 6 to 8 hours at room temperature. The matching food-grade silicone sealing ring has passed 10,000 opening and closing tests, ensuring tight sealing without any soup leakage.

　　Finally, dual surface treatments including electrolytic polishing and matte protective coating are applied. The smooth inner wall without micropores prevents food adhesion and allows easy cleaning with simple water flushing. The outer protective coating is scratch-resistant and anti-oxidative, keeping the box glossy after long-term use. Every thermal lunch tin box passes three strict inspections including heat retention test, sealing test and compression resistance test before leaving the factory. With rigorous and dedicated craftsmanship, we deliver a safe, durable and high-efficiency insulated lunch box, keeping your meals warm all the time.