It is cold and needs to be heated for use. Consumers can remove the sealing film of the bento after purchase, and then heat it up in the microwave oven within the stipulated shelf-life to consume it. Cold chain fast food, industrialized processing in the central kitchen, modern logistics and distribution, on-site secondary processing, safety, health, quality and freshness of the new model of food service, developed countries and developed regions of China are mostly used in this mode. Cold chain fast food is a convenient way of lunch with technological content.

The cold-chain lunchbox is to cool down the food rapidly after cooking, and the whole process of production, packaging, transportation, and sales is carried out at low temperature to maximize the freshness and taste of the food. The "cold bento" is packaged in sealed packages that are clearly labeled with the bento's production date, weight, storage method, shelf life and various ingredients.

Hot Chain Box Lunch

Hot Chain Box Lunch refers to meals that are uniformly processed in a centralized kitchen, then packaged and delivered to the place of sale through constant-temperature logistics, and can be consumed directly without heating. Because hot chain box lunch does not need to be sealed, it can be packaged in various materials such as iron box, wood chip and paper box under the premise of ensuring food safety.

The advantage of hot-chained boxed lunches is that the taste and flavor are very good, basically the same as what we usually eat in restaurants. The disadvantage is that it must be preserved and distributed at a constant temperature, low temperature will affect the taste, high temperature will affect the quality, the temperature deviation will also be conducive to a variety of bacterial growth.