Sheet material 0.5 cm thick containing 800 kg of dry stock/m³ of original wet stock is to be dried at constant drying condition. The Initial drying rate is 4 kg/hr. m² at the initial moisture content of 33%. The final drying rate is 1 kg/hr. m² at 6% final moisture content. The equilibrium moisture content is negligible. If drying is from the two large surfaces only, and if the drying rate in the falling rate period is proportional to the free moisture content, calculate the total drying time. All moisture contents are on the dry basis.

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