| 摘要 |
An insulated cooler chest for carrying perishables and cooling medium such as ice is improved to provide an extended period during which low temperatures are maintained. A sheet of flexible, synthetic, closed cell foam insulation material is placed over the perishables and the cooling medium. The sheet is trimmed or cut oversized, compared to the size of the cavity of the cooler chest. The sheet is pressed downward in the cavity and against the perishables and cooling medium, substantially conforming to the upper surface thereof. As the insulating sheet is oversized, the edges of the insulating sheet compress and seal against the interior walls of the cooler cavity, thus sealing perishables and cooling medium from outside convection currents and conductive heat. Preferably, the insulating material is of closed cell polyvinyl chloride nitrile butadiene rubber foam (PVC/NBR), which possesses elastic, compressive and rebound properties. It is lightweight, washable, sufficiently flexible and can be easily trimmed or cut to size. The insulation material is preferably of sufficient thickness to seal against the interior cooler walls and not bow significantly. |
