Quality measurement method and quality measurement device for long sheet material
AssigneesP.S.M. International PLC, Procemex Oy
InventorHisataka Shitara
Life of this patent
Estimating the term…
Abstract
The quality measurement method for a long sheet material W includes measuring cellulose fibers, % moisture, and % ash of the paper web W by using area cameras 1102 to 1106 having an infrared light receiving element and a light source 1100 having an infrared light emitting LED element. Performance check for the infrared cameras 1102 to 1106 over the entire width and correction of measured values are performed by using consistency between measured values for the same point in an overlap area measured by adjacent cameras and reference samples 1107 at the off-sheet positions provided at both sides.
Claims6
A quality parameter measurement device for a long sheet material that measures, by using an infrared light source and an infrared camera configured to receive infrared, a quality parameter of the long sheet material moving toward a winder, wherein
- a plurality of the infrared light sources and a plurality of the infrared cameras are arranged in the machine cross direction so as to cover the entire width of the long sheet material, and fields of view of adjacent infrared cameras overlap each other,
- the infrared camera is an infrared area camera,
- a plurality of the infrared light sources, each configured to emit infrared having a different wavelength, are arranged in the machine direction, and
- the plurality of infrared light sources are arranged so that infrared emitted from each of the plurality of infrared light sources and traveling via the long sheet material is measured simultaneously at the same infrared area camera, and so that irradiation areas of the plurality of infrared light sources do not overlap each other.
Dependencies are inferred from the claim text.