2. Uses & Features
② “Cooler Bag”
This kind of insulated bag is used for the preservation of drinks, fruits, breast milk/tea/seafood, etc.; it is also used for the refrigerated transportation of drugs, vaccines and other things.
A little different from the cooler bag, lunch bags are used to carry some food, such as lunch, snacks, food delivery, etc.
Most exterior fabric of the insulated bag is Oxford or Polyester, which is durable, high-strength and soft. Some use TPU with high-frequency thermally welded seams, which is waterproof and leakproof.
①Aluminum foil or sliver foil: Widely used in lunch bags, which is durable, soft and cheap. With its low thermal conductivity to gather air in the bag and keep food warm. Its layer is made from different materials, such as PE, XPE, EPE, etc. The thicker liner, the better the insulation effect.
②PEVA: It is a nontoxic Vinyl, a mixture of PE and EVA, which has good flexibility and elasticity. Most are leakproof which can hold cans with ice packs.
Some insulated bags are made by high-frequency thermally welded seams instead of traditional stitching sewing to integrate the whole bag body and prolong the inside temperature.
The insulated bag features excellent impact resistance, not easy to tear under heavy load, on the other way, stuffs inside the bag can not be oppressed.
It is a must for each insulated bag because tightness is necessary for preservation. There are different sealed ways, as the above points use thermally welded technology to reduce heat lost from traditional sewing. Besides, a zipper is also a vital key to ensure the tightness for an insulated bag.
6) Environmental Protection
Insulated bags are used food grade environmentally friendly materials, non-toxic, tasteless, UV resistant.