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Structure of insulated lunch kits
The insulated lunch kit is usually composed of three layers, namely the outer layer, the insulated sandwich and the inner layer. The outer layer of Oxford cloth or nylon cloth, strong and wear-resistant. The insulation layer adopts EPE pearl cotton insulation material to keep cold and heat. This layer determines the insulation efficiency of the insulation bento lunch bag. Aluminum foil is used in the inner material, which is radiation resistant and easy to clean.

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Innovation of insulated lunch kits
At present, the thermal insulation lunch bag is widely used in the market. The thermal insulation lunch bag can be used to solve the thermal insulation aging problem for food, fresh and other short distance cold and heat preservation. Compared with thermal insulation devices such as thermal insulation boxes, thermal insulation lunch bags have the characteristics of light and easy to fold, which can save space and reduce costs in transportation and storage. The shortcomings of heat preservation lunch bag is that the heat preservation time is limited, and the current use of pearl cotton material heat insulation performance is general and production should not be too thick.

1. Material innovation
Of course, the most important material is the heat insulation layer. At present, the heat insulation layer of the bento lunch bag is selected as the thermal insulation medium. Because of the high thermal conductivity of the pearl cotton, the insulation efficiency is limited. Foreigners use the polyurethane foam as insulation layer, which can greatly improve the thermal insulation of lunch bags. Green cold chain packaging center developed namiki thermal insulation material instead of pearl cotton, thermal insulation performance can be comparable with the common XPS insulation box.

2. Structural innovation
From the perspective of structural optimization of thermal insulation lunch bag, it is necessary to consider the structural factors that affect the thermal insulation performance of thermal insulation lunch bag, such as no thermal insulation material at the joints of the adjacent surface of the thermal insulation lunch bag, no windproof structure at the zipper of the bag mouth, etc. These parts also generate a large amount of air convection heat transfer, resulting in the decline of thermal insulation performance.

Bags with insulation are required to transport hot or cold food. These bags may only last two hours at most since that's when bacteria and other germs are most likely to multiply to potentially dangerous and disease-causing levels. With the right insulation, you can keep your food hot or cold for up to three hours. One more plus is a lunch bag that doubles as a thermos and is constructed of waterproof, recyclable material.

Without the use of gel packs, hot food in an insulated lunch bag should still remain heated after two to three hours, and cold food should still be cold after four to five hours. The addition of a hot or cold gel pack can extend the use time of the bag by three to four hours.

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These estimates are, however, extremely sensitive to both the bag's quality and the surrounding temperature.

When filled with ice or ice packs, insulated bags can maintain a safe temperature for up to 12 hours, perfect for transporting perishables. On the other hand, the temperature will rise gradually. If you want your sandwiches, meat, frozen meals, baby bottles, groceries, and other perishable shipping things to remain usable, etc., you'll need to arrange them appropriately. Perishables, such as hot and fresh food, should be eaten as soon as possible to prevent deterioration, so make sure to carry enough of reusable ice packs and consume them quickly.

Still, insulated bags may be a terrific companion in keeping your food cold, whether you're taking it to the workplace for a few hours or utilizing it for a full-day picnic when traveling. These bags are also quite useful for shipping and delivering food.

Depending on the quality of the bag you choose, you may still anticipate cold beverages at the conclusion of a day trip, though they will likely be somewhat warmer than they were at the beginning.

Occasionally, a thermal bag's ice retention period will be listed in the product description. How long the ice can be stored in the bag before it begins to melt. While these measures can serve as a general guide, it's important to keep in mind that ice may melt more quickly than the estimated time if you're using it outside or if the temperature is higher than normal.

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