Device and method for measuring the surface hardness of...

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Details

G01N 3/40 (2006.01) G01N 3/42 (2006.01) G01N 33/34 (2006.01) G01N 3/00 (2006.01) G01N 3/02 (2006.01)

Patent

CA 2241889

The invention relates to a device for measuring the surface hardness of rolls (2) of paper or other material. Said device comprises at least one hardness measuring head (12) with at least one rotatably mounted contact roll to rest, under radial pressure, on the revolving roll (2) of paper or the like. The hardness measuring head (12) can be moved on a rail (11) substantially parallel to the winding axis of the roll (2) or the like and has means for evaluating the measuring signals of the hardness measuring head (12). It is proposed to provide first and second means to monitor and, optionally, influence parameters of a material strip wound to form the roll, such as roll hardness, strip tension, uniformity of roll diameter along the roll width and the like, during winding. Said means can be used to hold at least one of the contact rolls (126, 127; 126', 126'', 127'') in position on the roll (2) with a first force and to cause at least one of the contact rolls (126, 127; 127', 127'') to penetrate with a second force deeper into the surface than with the first force.

L'invention concerne un dispositif pour mesurer la dureté de la surface de rouleaux (2) de papier ou d'autres matériaux. Ce dispositif comprend au moins une tête de mesure de la dureté (12) avec au moins un rouleau de contact monté rotatif, destiné à venir contre le rouleau (2) de papier, ou similaire, en rotation, sous l'effet d'une pression radiale. La tête de mesure de la dureté (12) peut être déplacée sur une traverse (11) sensiblement parallèlement à l'axe d'enroulement du rouleau (2) ou similaire. Le dispositif comprend en outre des éléments pour évaluer les signaux de mesure émanant de la tête de mesure de la dureté (12). Afin de pouvoir contrôler avec davantage d'exactitude les paramètres d'une bande de matériau enroulée pour former un rouleau, tels que la dureté du rouleau, la tension de la bande, l'uniformité du diamètre du rouleau le long de la largeur du rouleau et autres, ou d'influer sur ces paramètres, pendant le processus d'enroulement, il est prévu de premiers et de seconds éléments permettant de maintenir au moins un des rouleaux de contact (126, 127; 126', 126", 127") en position sur le rouleau (2) avec une première force, et permettant au moins à un des rouleaux de contact (126, 127; 127', 127") de pénétrer dans la surface plus profondément avec une seconde force qu'avec la première force.

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