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According to the appearance materials, there are many kinds of thermal insulation lunch boxes, including stainless steel thermal insulation lunch boxes, PP thermal insulation lunch boxes, etc. Not only are the appearance materials diverse, but also the materials of the liner are divided into stainless steel materials, ceramic materials and glass materials.
From the perspective of the need for fall resistance, stainless steel is better for the thermal insulation lunch box, but relatively speaking, the color and pattern will be relatively simple; From the aesthetic point of view, the ceramic or PP insulated lunch box is more advanced in design, but the ceramic material is relatively heavy and fragile, making it inconvenient to carry; The PP insulated lunch box is better if you choose from the light side.
Simple identification method of heat preservation performance: pour boiling water into the heat preservation cup, screw the bottle stopper or lid clockwise and tighten it for 2-3 minutes, then touch the outer surface of the cup body with your hand. If the cup (kettle) body is obviously warm, especially the lower part of the cup body is hot, it means that the product has lost its vacuum and can not achieve good heat preservation effect, while the lower part of the heat preservation cup is always cool. Mistake: Some people use their ears to listen to whether there is a Zizi sound to determine its thermal insulation performance. The ears cannot hear whether there is a vacuum.