Putz, Hans-Joachim ; Strauß, Johann (2008)
Impact of the storage of recycled fibre pulp samples on physical and chemical properties.
In: Progress in paper recycling, 18 (1)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

An INFOR research study explored the performance attributes of recovered paper which were influenced by storage conditions and time. The pulps used for testing were obtained from two plants. One plant made corrugated base papers and used mixed and brown grades of recovered paper. Recovered paper was processed for deinking at the second plant, for the production of new graphic papers. Samples were collected from three locations at each stock preparation plant. The three samples represented high consistency suspension properties (around 4%), low consistency suspension properties (around 1%) and process water properties. Samples were stored for a maximum of seven days at temperatures varying from -20 deg C to +45 deg C. Most tests were conducted on samples stored at refrigerator or at room temperatures. Results cover suspension, handsheet and process water characteristics as well as the effects of storage and temperature. Findings showed that the initial base load influences the speed at which organic acids form in recovered paper samples during storage. An odour nuisance may result from the organic acids but there was a lower than anticipated storage effect. Measurements should, where possible, be carried out as soon as possible after samples are collected. Otherwise, major change in physical and chemical performance attributes during the first few days can be impeded by refrigeration. Samples for TOC and COD analysis can be frozen where longer storage of pulp samples is required. Appropriate levels of sodium azide or of biocides can be included to the stock suspension in measuring organic acids. Where suspension attributes are to be measured, samples should not be frozen. (8 fig, 5 tab, 6 ref)

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