EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 8791-1 testing. It can be applied to most papers and boards, and not to embossed or creped papers, or papers that will not lie flat under test conditions, or papers with high air permeability that allow significant airflow through the sheet. The Gurley tool is excluded from this method.
---bolum-1:-genel-yontem.jpg "ISO 8791-1 Paper and Cardboard - Roughness-Smoothness Determination (Air Leak Methods) - Part 1: General Method")
ISO 8791 specifies methods for measuring the roughness or smoothness of a paper or cardboard surface through a group of procedures that may be termed air leakage procedures. Measurements can be made with any instrument that complies with ISO 8791.
This part of ISO 8791 specifies the basic requirements and general operating procedures for apparatus for test methods where the air leak is between the test piece surface and a flat surface.
For the purposes of ISO 8791, the roughness or smoothness of a sheet of paper or cardboard is a function of the speed at which air will pass between a given flat area and a sheet of paper or cardboard when tested under certain conditions.
If increasing numerical values indicate increasing roughness, the feature is called roughness. Examples of this are the Bendtsen, Parker and Sheffield tests.
The units used to express the results depend on the instrument used, but in most cases the units are milliliters/minute for roughness measurements and seconds for smoothness measurements. The Parker Print-Surf apparatus is an exception and roughness measurements are expressed in micrometres.
EUROLAB assists manufacturers with ISO 8791-1 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.
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