DefinePK

Abstract

Waste paper is one of the most feasible raw materials for the pulp and paper industry in Turkey as well as in many other countries. However the utilisation process is not so easy. Problem starts from the collection, consumers, transportation, classification and goes to the pulping strategy and production with chemical addition. The composition of waste papers used in the paper production greatly varies from time to time and the location from which it is collected. This creates a great concern at the mills from the fact that the production quality inevitably changes and fluctuates. In such situation, the production has to be monitored very closely and parameters should be modified very fast if something occurs. This research is concentrated on the investigation of interactions between the acidic internal sizing agent and four waste paper grades. Handsheets were made from each waste paper groups with alum-rosin addition as an internal sizing agent. Papers were tested firstly for water resistance and some other standard properties. Results showed that the interactions between the chemical added and the waste paper groups used here were significantly different. This suggests that chemical addition points, order, dosage and contact time should be prescribed differently for each group of waste papers instead of pumping in a mixed stock as common practice.