The Roughness of paper or similar material is defined as the volume of air that is forced by a specified pressure difference escapes in unit time by passing between the surface of the specimen and flat metal ring resting on a specimen. The values indicates the surface smoothness of graded paper suitable for good print quality.
A sample is placed on a perfect plane glass plate, measuring head on the test piece and a controlled and low air pressure pass through a flat metal ring and the specimen.
The pressure difference read off/on selected rota meter tube.
Measuring range - 5-150 ml/min. 50-500 ml/min., 300-3000 ml/min.
SCAN P 21, P 60, BS 4420, TAPPI UM 535, ISO 2494, 5636/3, APPITA/AS 1301.440 DIN 53120
Newsprint (Roughness Smoothness)
Writing Printing/copier Paper (Roughness Smoothness)
Duplex And Art Paper (Roughness Smoothness)
Corrugated Fibre Board Box Board (Softness)
Tissue & Soft Material (Softness)