However, with the development of cold chain logistics, many consumers find that the fresh food they order is also packaged and distributed in foam boxes. Many consumers have expressed curiosity: can foam boxes keep heat? How long is the holding time?
Foam boxes or EPS foam parts are excellent packaging materials, such as TVs, refrigerators, washing machines, air conditioners, electronic instruments, precision instruments, glassware, ceramic products, arts and crafts, etc., are inseparable from EPS foam parts As a cushioning package. EPS foam is based on polystyrene resin,
Add auxiliary materials such as foaming agent, light materials made by heating and foaming. It has the advantages of light weight, small thermal conductivity, low water absorption, water resistance, aging resistance, low temperature resistance, easy processing, low price and high quality. PS packaging products are relatively easy to recycle and reuse, and are outstanding green packaging materials.
Professionals have shown that the foam box can both keep cold and keep warm. The reason why the foam box can keep warm is that the foam material has low heat transfer performance, and the foam contains a lot of air, and the movement of the air is extremely severely blocked. Composition of circulation
"Convection heat conduction" effect, so it can play a very good thermal insulation effect. The heat preservation time of the foam box depends on the thickness of the box body, the amount of ice cubes, and the amount of heat preservation material. If the volume of the ice cube and the volume of the material to be insulated are appropriate, the thickness of the foam box is about 3 cm, and it should be possible to keep it for a day or two.
The foam box can maintain the freshness of the items for a long time to avoid losing the original taste of the food during storage. However, in order to ensure outstanding thermal insulation effects, users should also understand the storage items:
1. The foam box contains flammable and volatile foaming agents, and avoid fire during storage.
2. The product storage place should be excellent in cool and well ventilated, in order to avoid the foaming agent from escaping too fast, adhere to a moderate rate, the storage temperature is preferably below 25 ℃, and often adhere to ventilation.
3. The foam box should be made of advanced materials first and freshness as long as possible to obtain stable operating conditions and outstanding products.