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Apparatus and method for measuring caliper of creped tissue paper | Vorrichtung und Verfahren zum Messen der Stärke von gekrepptem Papier | Appareil et procédé de mesure de l'épaisseur de papier crêpé

Patentnummer:EP2863169B1
IPC Hauptklasse:G01B001130
Anmelder:
Erfinder:
Anmeldung:19.09.14
Offenlegung:17.10.13
Patenterteilung:23.05.18

Abstract / Hauptanspruch
A method includes, using at least one processing device (124), obtaining (704) an image of a web (254) of creped tissue paper and identifying (712) a caliper measurement of the web using the image. The caliper measurement is based on a dominant frequency of the web and a standard deviation of diffusely-reflected light from the web. The dominant frequency of the web can be based on a number of crepe folds having a dominant crepe fold size that fit within a specified unit distance of the web in the image. The dominant crepe fold size can be determined using a discrete auto-covariance function of the image or a second image of the web. The standard deviation can be based on a variation of reflected light from larger crepe structures in the web.

EP2863169B1


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