Autumn is coming,The temperature gradually drops, and the food will be cold after being put in the lunch box for a while. Even the insulated lunch box cannot escape the fate of “fast cooling”, which can damage many “families with food”. Choose one with good thermal insulation performance Safe and environment-friendly lunch boxes have become an urgent problem for office workers and student Party members.
So,How to choose a seemingly small lunch box?
Look at the simple identification method of stainless steel materials:
there are many specifications of stainless steel materials, among which 18/8 (also known as 304 # stainless steel) means that this stainless steel material contains 18% chromium and 8% nickel. The materials that meet this standard meet the national food standard, are green environmental protection products, rust proof and corrosion resistant.
Identification method:
the color of ordinary stainless steel cup is white or dark. If 1% salt water is put into it for 24 hours, rust spots will appear, and some elements contained in it exceed the standard, directly endangering human health. In addition, it can also be identified by magnets. 304 stainless steel is less magnetic. If it can be quickly absorbed by a magnet test, it is likely to be stainless iron with larger magnetism.
Look at the plastic accessories The plastic accessories on the lunch box should be food grade accessories.
Identification method:
food grade plastic has small odor, bright surface, no burr, long service life and is not easy to age. Ordinary plastics or recycled plastics have the characteristics of big smell, dark color, many burrs, and plastic is easy to age and fracture. It may also contain a large number of carcinogenic plasticizers.
Simple identification of thermal insulation performance
Pour boiling water into the insulation box, and touch the external surface of the insulation box with your hands after a few minutes. If there is obvious warmth (especially at the bottom), it means that the product has lost its vacuum and can not be well insulated.
Sealing performance identification
Fill with water and cover the lid, then invert it for a few minutes (or throw it hard) to see if there is water leaking out.
Simple capacity identification method
If the depth of the stainless steel lunch box liner is similar to the height of the outer liner, the capacity should conform to the nominal value. In order to cut corners and compensate for the weight of missing materials, some domestic brands add sand, cement, etc. in cups, which affects the insulation effect.
See internal coating and interface
The inner wall of the thermal insulation is non-toxic, and there is no welding interface on the inner and outer walls (there is obviously a stainless steel seam welding interface on the inner wall or outer wall of many domestic thermal insulation lunch boxes). The best lunch box is one that has no smell.
Measuring insulation time
If the heat preservation time of the lunch box can reach 4-6 hours, it is an excellent heat preservation lunch box.
Post time: Sep-17-2022