To provide impregnated paper suitable for being coated or impregnated with a volatile chemical fluid such as an insect proof liquid, and to provide an indicator paperboard having an indicator function even without laminating a coloring layer and liquid-absorbing layer.
The impregnated paper is obtained by using at least one layer of a back layer or middle layer as the liquid-absorbing layer. Furthermore, the liquid-absorbing layer is formed by using pulp containing at least non-wood fibers, and the surface of the back layer has an oil absorption of 0.5-9.5 s measured according to J. TAPPI No. 32-2 (2000). The surface of the surface layer of the impregnated paper is coated with a coating liquid containing at least silica to form a coating layer containing the silica in an amount of 10-50 mass% in terms of solid content. The surface layer and coating layer of the impregnated paper include an indicator layer to form the indicator paperboard.
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Sadayoshi Igarashi
Susumu Kitano
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