ISO 8791-5 Paper and Cardboard - Roughness-Smoothness Determination (Air Leak Methods) - Part 5: Oken Method

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 8791-5 testing. This standard specifies the Oken method for determining the smoothness of paper and board using an apparatus conforming to the Oken method defined in this part of ISO 8791. Applies to all printing papers and boards.

The air pressure on the inlet side of a narrow capillary of controlled dimensions is kept at a constant value above atmospheric pressure. Air passes through the capillary tube and then leaks between the surface of the test piece and the measuring areas. The air pressure between the exit side of the capillary and the test piece depends on the air flow rate between the measuring areas and the surface of the test piece. It is measured and converted to Oken smoothness.

The water column manometer and the scale plate make up the pressure measurement system. The water column manometer is connected to the water tank at a depth of more than 500 mm from the water surface in the water tank, with a pipe with a large diameter (minimum 3 mm) to allow the water to pass between them smoothly. The manometer is connected to the sensing head and capillary.

EUROLAB assists manufacturers with ISO 8791-5 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.