Development of a new permeability tester of paper
| Autor: | Kentaro Yamamoto, Akihiko Iwasaki, Mineko Iwasaki, Zenichi Miyagi, Shichio Hara |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Paperboard
Materials science business.industry Electrical engineering Pressure differential Mechanics Permeation law.invention Volumetric flow rate Permeability (earth sciences) Pressure measurement law Approximation error Air permeability specific surface visual_art visual_art.visual_art_medium business |
| Zdroj: | Journal of the Japan Society of Precision Engineering. 51:861-865 |
| ISSN: | 0374-3543 |
| Popis: | The permeability test is standardized by JIS P 8117 Testing Method for Air Permeability of Paper and Paperboard, in which the permeability is provided by Gurley's permeability TG in second, which is the elapsed time necessary for air of definite volume to permeate through definite area of paper under definite pressure differential. The measuring range of TG is prescribed between 2 and 1800 s. The method is time consuming and inefficient at the practical testing, because at least the elapsed time of TG is necessary at the test. In order to indicate TG value in a moment a new permeability tester is developed, the principle of which is similar to that of a pneumatic micrometer of back-pressure type. Assuming that flow rate of air through paper is proportional to pressure differential, working principle of the test is analysed, and a method of graduation of Gurley's permeability TG on a water column manometer is derived theoretically. And the error evaluation of the tester becomes possible. The relative error of TG due to measuring error of the manometer can be limited within 1% by giving suitable design constants at the design of the tester. The assumption of flow rate through paper is confirmed by a special operation of the tester. |
| Databáze: | OpenAIRE |
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