The cooler bag is designed for going to nature or to the country in the summer or for long trips. To keep food refrigerated, just pack them in this unit, and later you can enjoy fresh and tasty food. To use all the advantages of a thermal bag, you need to choose the most high-quality and multi-functional copy.
How does a cooler bag work?
The positive effect of the operation of a conventional refrigerator is based on the fact that the temperature initially set and necessary for their preservation is maintained in the food storage chamber. Well, how does a cooler bag work? The manufacturer explains that inside it has the conditions to maintain optimal temperature. In this device, foil is used, which covers all the details of the object, as well as a saline solution in frozen form, which plays a decisive role in maintaining cold air in an unchanged state.
The way the cooler bag works can be compared with the functioning of a thermos, however, in this case the opposite effect is created. For the manufacture of this device, high-quality and reliable heat-insulating materials are used, so the products are in excellent condition for several hours before being used, so with this unit you can even travel long distances, carrying chilled food with you. A cooler bag will be useful if a quality item is selected.
The secret to the proper operation of a thermobag is very simple. Inside it there is a thermal box, the main material for the creation of which is foamed polyethylene, previously sealed and glued. It is covered with an even layer of foil, therefore, in addition to tightness and resistance to temperature exchange with the environment, a reflective effect is also achieved. To maintain a cold temperature unchanged, batteries are used that operate with a saline solution. This explains how the cooler bag works.
Parameters of the cooler bag
Before choosing this item, you should determine in advance exactly how the food in it will be delivered to its destination. If the food will be in the car, you can take a bag of about 50 liters in volume. It fits perfectly in the car and allows you to pack a lot of products, however, it is almost impossible to lift and carry it, transport it in public transport. If you need to keep food fresh for a long time, you should choose large items. The wider the bag, the more powerful the batteries are installed in it. This will help you understand how the cooler bag works.
Material
Typically, the manufacture of cooler bags uses special synthetic fibers for the fabric. Such materials can not only create a protective barrier against moisture, but also resist the penetration of ultraviolet rays, which should be considered when the question arises: "How does a cooler bag work?"
You can choose a good one if you make sure that the outer part is normally framed by polyester, nylon or PVC is used. These types of fabrics can be easily cleaned, and they also dry quickly. In each such bag there is a thermal insulation pad made of foam, which is located between the upper part of the thermobag and the container placed inside this product.
Internal construction
When purchasing a thermal bag, you can not ignore its internal design, since it is there that you need to lay products. Some manufacturers, who are pleased with the lower prices, do not lay the highest quality PVC inside, but use polyethylene, which allows excellent savings during production. It should be remembered that in such units, products lose their fresh appearance much faster, can change their smell than when using a refrigerator or a high-quality thermal bag. Even with a full battery for inhibiting cold, products in such a bag can be stored for no more than 3 hours.
Features of a car thermobag
Consider an item like a car cooler bag. How this device works - good or bad - is determined by the quality of the materials used in the manufacture of the three layers:
- External. Created from plastic, usually has a light shade.
- Interior. This is a container that serves as a container for folding and packaging products.
- Interlayer. It is a special line of polyurethane foam, which provides maximum thermal insulation. The quality and effectiveness of a cooler bag is often determined by the thickness of this layer. Usually it is 3-5 cm, which is the best indicator. This will help you understand how to choose a cooler bag. Tips indicate that you need to be careful when buying.
When this design is respected, food can be stored in a bag for up to 12 hours, even if the cold batteries are turned off. When the kit contains special batteries, the freshness of the products is guaranteed to be supported for 24 hours or more.
Wall thickness
When a decision is made on the purchase of a cooler bag, the thickness of its walls should be determined and compared with other indicators. If the walls are really very thin, that is, it is almost impossible to feel the heat-insulating layer, you should not purchase such a model, since the freshness of the products cannot be preserved. The thicker this layer, the more attention the particular model deserves. This determines the quality of such an item as a cooler bag. What you should pay attention to is the quality and features of all layers.
The inner layer
The protective layer is made only of PVC, and this material should not only be of high quality, but also absolutely airtight. Such a fabric does not need special care. It is enough to wash it periodically, and it dries very quickly. Sometimes, special PVC is used for the manufacture of protective walls, the surface of which can be compared with an amalgam, which makes it possible to put such material in a row with tetrapacks. With its help, additional temperature retention is provided, as well as protection from defrosting products for a long time.
Casters and shoulder straps
When the volume of the bag is not very large, it can be easily carried on the shoulder. For this, manufacturers specifically provide wide and comfortable handles with a soft lining. If the bag has a large volume, rather large rollers with a handle are provided as accessories for it, which, if necessary, extends and retracts so as not to make up excess volume. It can be fixed in several versions, choosing the most convenient position.
The presence of handles and locks
When choosing a cooler bag, you need to pay attention to its convenience and safety in use, the determining factors for which are handles and locks. If there are special locks, you can definitely not worry that the bag will be opened by children or animals will gain access to its contents. Typically, protective devices are mounted on the handle of the unit. They are very easy to manage, and you do not have to use excessive force to open and close them.