New Automated Method For Macro-Contaminant Analysis: Industrial Applications

摘要

In recycled paper processes, stickies are at the origin of many production disturbances. In this paper, we present how the recently developed method for macro-contaminant analysis was used with industrial samples for process analysis. The new automated stickies measurement method allows to (i) determine the 3 dimensional morphology of screened particles (without any deformation) and (ii) classify the particles as stickies among contaminants. This is achieved by a combination of laser triangulation and local near-infrared (MR) spectroscopy. Measurement of macro-contaminants in pulp samples and their classification allows concluding on their specific removal. Chemical nature and amount of the macro-contaminants coming from different raw materials were studied and were shown to be very different in two different mills. In an Asian mill, a low PSA removal in the process (46%) was found in comparison with high other stickies removal (99%). Besides, perspectives with this device are shown, with the on-going development of a new on-line sensor for macro-contaminant analysis.