Method of determining the orientation of fibers on the...

D - Textiles – Paper – 21 – G

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D21G 9/00 (2006.01) B41J 11/00 (2006.01) G01N 21/21 (2006.01) G01N 21/86 (2006.01)

Patent

CA 2164500

A method of determining the orientation of fibers on the surface of paper rather than measuring the orientation of fibers throughout the entire layer of paper is provided. In directing incident light Li from a projecting unit 6 to the surface 1a of the paper 1 to be measured at a given angle (.theta.i) of incidence and receiving by a receiving unit 7 the intensity of light reflected Lo by and off the surface 1a of the paper 1 at the same angle (.theta.o) of regular reflection as the angle (.theta.i) of incidence, the incident light Li containing at least the linearly polarized principal ray is allowed to be incident on the surface 1a of the paper 1, so that at leastthe linearly polarized principal ray can be received by the receiving unit 7 in the form of reflected light Lo, and the surface 1a of the paper 1 is inclined at an angle (.alpha.) of inclination around the line of intersection of a plane M of incidence and reflection through which the incident light Li and reflected light Lo pass with the surface 1a of the paper 1 while the paper 1 is rotated relative to the plane of incidence and reflection around the center axis of rotation defined by a line that passes through a center point 3 of the surface 1a of the paper 1 irradiated withthe incident light and is vertical to the surface of the paper, whereby the fiber orientation on the surface 1a of the paper 1 can be found from the intensity of the reflected light Lo received by the receiving unit 7 corresponding to the angle of rotation of the paper 1.

Méthode de mesure de l'orientation des fibres superficielles d'un papier et non de l'orientation moyenne des fibres incluant les couches internes. Une lumière incidente (Li) est émise par un projecteur (6) sur la surface (1a) d'un papier (1) devant faire l'objet de la mesure. Cette lumière présente un angle d'incidence (.theta.i) prédéterminé; elle est réfléchie sous un angle de réflexion régulier (.theta.o) égal à l'angle d'incidence (.theta.i), et elle est reçue par un photodétecteur (7). La lumière incidente se compose d'une lumière principale polarisée linéairement présentant un plan de vibration perpendiculaire au plan d'incidence et de réflexion qui inclut le trajet de la lumière incidente et de la lumière réfléchie. La lumière réfléchie (Lo) reçue par le photodétecteur ne se compose que de la lumière principale à polarisation linéaire. La surface du papier (1a) est inclinée sous un angle plan (.alpha., l'intersection entre le plan d'incidence et de réflexion et de la surface du papier (1a) étant l'axe médian. Le papier (1) est ensuite déroulé par rapport au plan d'incidence et de réflexion selon une ligne qui passe par le centre du faisceau incident à la surface (1a) du papier et qui est vertical par rapport à la surface (1a) du papier en tant qu'axe médian de rotation. L'orientation des fibres de la surface du papier (1) est déterminée à partir de l'intensité de la lumière réfléchie (Lo) reçue par le récepteur (7) et correspondant à l'angle de rotation du papier (1).

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