| 摘要 |
PURPOSE:To protect a product partially from being heated up by protecting foaming sections from rising in temperature or controlling the temperature rise when the temperature of a foaming material layer reaches the foaming temperature and being foaming because of conductive heating or dielectric heating. CONSTITUTION:Foaming ink on the market is applied (applied by brush) all over the outer surface of a packing sheet on the market, waterproofed with synthetic resin, to manufacture an endothermic sheet. A wet paper towel is wrapped by the endothermic sheet thus manufactured with its foaming material layer being outside and heated up in an electronic range for three minutes. Immediately after heating, the wrapped product is taken out, and the internal temperature of the product is 85 deg.C and the surface temperature is 40 deg.C when the temperature of internal section and outer surface of the wrapped product is measured by a thermosensor produced by OMRON. The surface temperature of the product is not heated up to the degree that cannot be held up by hand.
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