Method and apparatus for on-line testing of the stiffness or...

G - Physics – 01 – N

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G01N 3/20 (2006.01) G01N 33/46 (2006.01) G01N 35/04 (2006.01)

Patent

CA 2220789

A method and apparatus for testing the stiffness or strength of wood panels while the panels are moving along a production line, in which the panels are moved lengthwise through a tester having lower rotary means which are situated to support side or end marginal portions only of the panel while central upper rotary means contacts a central region of the panel and subjects the panel to longitudinal or lateral bending. The forces corresponding to the bending are measured and used to obtain a measure of the stiffness or strength of the panel. Preferably, both a longitudinal and a lateral tester are provided, and each have two testing stations each applying a different amount of lateral bending, all of these amounts being in the substantially linear portion of the load deflection curve.

Méthode et appareil conçus pour faire l'essai de la rigidité ou de la résistance de panneaux de bois alors que ces panneaux, placés dans le sens de la longueur, se déplacent sur une ligne de production et passent par un appareil de mesure muni d'un dispositif de rotation inférieur placé de telle sorte qu'il ne soutient que des sections latérales ou marginales du panneau. Un dispositif supérieur central entre en même temps en contact avec une partie centrale du panneau et le soumet à une flexion longitudinale ou latérale. Les forces correspondant à cette flexion, qui sont mesurées, permettent de donner une mesure de la rigidité ou de la résistance du panneau. On utilise de préférence un appareil de mesure longitudinale et un appareil de mesure latérale, et chaque appareil comprend deux stations d'essai qui appliquent chacune une flexion latérale de force différente, ces forces de flexion suivant une relation plus ou moins linéaire par rapport à la courbe charge-déformation.

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