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RECYCLING OF PAPER - CHANGES OF MECHANICAL AND OPTICAL PROPERTIES
Abstract
The goal of a recycled paper or board manufacturer is to make a product that meets customersО„ specification and requirements. At the present utilization rate, using recycled fibres in commodity grades such as newsprint and packaging paper and board has not caused noticeable deterioration in product quality and performance. The expected increase in recovery rates of used pa per products will require a considerable consumption increase of recycled fibres in higher quality grades such as office paper and magazine paper. To promote expanded use of recovered paper, understanding the fundamental nature of recycled fibres an d the differences from virgin fibres is necessary. The aim of this work was to follow and qualif y the changes at the selected properties of pulp fibers, made up of soft wood composition, by recycling process. The experimental conditions, in term of fibe rs modification, simulated the process of paper production begun from primary fibers 8-times recycled. The pulp fibers were drying at the temperatures: 80В°C, 100 В°C, and 120 В°C. After each recycling process selected properties (strength- breaking length, tear index, optical -brightness, opacity hand sheets properties) were evaluated. Following result determination of 8-multiple recycling of bleached kraft pulp, made of the mixture of soft woods, was shown that the process of repeated defibering, beating and drying causes irreversible modification in pulp fibres. After the fifth recycling (sixth beating) faulte d changes (extremes) were observable in mechanical and optical properties. We interpret these changes as ending of outside and more intense of inside fibrillation and delamination. The influence of recycling number on selected properties of fibres was evident after every beating degree and this effect was markedly proved in pulp drying at higher temperature -120 В°C.
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