The correlation is as follows
Lunch boxes include plastic lunch boxes, insulated lunch boxes and ordinary lunch boxes. The insulated lunch box is composed of ordinary lunch boxes, with an insulated shell, the inner and outer layers filled with foam plastic, and the inner layer plated with metal film. Reduce the heat loss caused by conduction, radiation and convection, and install an electric heating device between the lunch box and the shell to supplement the heat loss and keep the food at a certain high temperature.
Microwave lunch box:
The texture is thick and strong, and it won't break no matter how you fall. When the temperature is 140℃- MINUS 30℃, it can be cooked in microwave oven or refrigerated in freezer. No embrittlement, no aging.
The box is generally glass-colored, clear and transparent. The lunch box has a built-in small steaming rack, which provides convenience for steaming noodle products, and has the function of dripping water to keep the original flavor of food, so as to heat oily food without water.
Insulated lunch box:
Lunch boxes that can keep the temperature of meals can be divided into several types, such as stainless steel liners and tempered glass liners. Different materials have different thermal insulation properties. Vacuum heat preservation can be 10 hour, and heat preservation and cold preservation can be 24 hours.
Military lunch box:
Professional lunch box for marching troops. Generally, it is light and small, not easy to rust, and has strong plasticity, which can avoid the damage to the body caused by knocking.