By L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)
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As the microbiological slime ages it also changes in composition. Conditions in the interior ofthe slime may become anaerobic as a result of slow diffusion of oxygen within the slime deposit and anaerobic bacteria may take over within the slime, particularly close to the surface onto which the slime is formed as this is the point of lowest oxygen concentration. At this stage the microbiological deposit may cause extensive corrosion of the papermaking equipment and may produce obnoxious organic gases.
1): 1. Natural wood resins may exist within the fibre itself 2. Potentially depositable organic substances may be adsorbed onto the surface of the fibre PAPER MACHINE DEPOSITS 31 • • •• Collodial • Agglomerate f Deposit Fig. 1 Physical forms of pitch. 3. The potentially depositable material may exist in the form of colloidal particles; the size of these particles is (for natural wood pitch) slightly below one micron with a distribution up to a few microns, but for depositable material of synthetic origin particle size may be considerably bigger 4.
The following example will illustrate the value of monitoring these parameters for trouble-shooting. A neutral uncoated fine paper mill, using RETENTION AND DRAINAGE AIDS 25 cationic starch and anionic colloidal silica system, was found to suffer from poor retention. 13 Since the retention in this mill had been automatically controlled to a set level of white water consistency, the poor retention had led to a high usage ofthe colloidal silica. Extensive investigation work was carried out to try to locate the cause of the problem.
Applications of Wet-End Paper Chemistry by L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)