appareil pour essais de hauteur
- Domaine
-
- industrie papetière matériel d'essai du papier
- Dernière mise à jour
Terme privilégié :
- appareil pour essais de hauteur n. m.
Termes utilisés dans certains contextes :
- appareil pour essais d'ascension n. m.
- appareil pour essais d'absorption n. m.
Traductions
-
anglais
Auteur : Office québécois de la langue française,Définition
((...)) an instrument for measuring the relative absorbing power of blotting paper. The best known type of instrument for this purpose is comparatively simple. It consists of a shallow tray in which ink or water (HM) is poured. At a fixed height above this, is a bar to which 4 or more strips of the blotting paper to be tested are attached hanging down, parallel with scaled metal strips just touching the liquid. These specimens hang down perpendicularly in such a way that they dip in the ink to a known depth and the height to which the ink rises in a given time (say 10 minutes) can be seen and recorded. This is similar to the weight test, where instead of the height of the ink absorbed being measured, the strips are weighed before and after the test, the weight of ink absorbed being a measure of their absorbency. A more modern instrument (Dalen, HM II67) to test the relative absorption of paper for ink is one in which the speed at which ink is absorbed is measured by passing a strip of blotting paper, immediately after a uniform drop of ink has fallen upon it, between two rolls of non-absorbent material running at constant speed and pressure. The quicker the ink is absorbed the shorter will be the "tail" to the blot extended on the specimen. In good qualities of blotting paper, this tail is 20 mm (say 13/16") while if it is longer than 110 mm (say 41/2") the specimen possesses unsufficient absorbing power.
Terme :
- bibliometer