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Roughness/ Smoothness of paper or similar material is defined as the volume of air that forced by a specified pressure difference escapes in unit time by passing between the surface ofthe specimen and flat metal ring resting on a specimen and exerting a definite pressure on it.
Three Rotameter tubes ranging from 0-150,150-500 300 - 3000 ml/min.
Smoothness / Roughness Contact Pressure roughness air Pressure: 98 kPa by measuring head of weight 267±0.5 gram. Through pressure governor consisting of a rotating
Cylindrical body and 3 Manostat weights which giveconstant pressure of approx. 0.75, 1.5 & 2.25 kP