BS ISO 8791-5:2020 pdf free.Paper and board一Determination of roughness/smoothness (air leak methods).
BS ISO 8791-5 1 Scope This document specifies the Oken method for determining the smoothness of paper and board using an apparatus which complies with the Oken method, as defined in this part of ISO 8791. It is applicable to all printing papers and boards. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 48, Rubber, vulcanized or thermoplastic一Determination of hardness (hardness between 10 IRDH and 100 IRDH) ISO 186, Paper and board一Sampling to determine average quality ISO 187, Paper, board and pulps一Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples ISO 4662, Rubber, vulcanized or thermoplastic一Determination of rebound resilience.5.2.1.1.1 The loading weight and rubber plate, the loading weight has a circular even surface of not less than 48 mm in diameter and a mass that clamps the test piece at a pressure of (98,1 士1,0] kPa. The rubber plate has a diameter of not less than 48 mm, a thickness of [4土0,2) mm, a hardness of (50士5] IRHD in accordance with ISO 48, and a rebound resilience of not less than 62 % in accordance with ISO 4662.5.2.1.1.2 The sensing head, has 10 concentric measuring lands and nine grooves. The outermost measuring land has a width of [0,5土0,03) mm, and an outside diameter of [46土0,03) mm. The width
of the other nine measuring lands is (1土0,03) mm. The inside diameter of innermost measuring land s (9土0,03) mm. All grooves have a width of (1土0,03) mm, and a depth of 0,5 mm to 1,2 mm. Five grooves have air outlet holes and four grooves have air inlet holes arranged alternately. A tube connects the sensing head to the pressure measuring chamber.BS ISO 8791-5 pdf download.