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The production of pulps and paper has a variety of negative influence on the environment. There are some technologies which can moderate the negative impacts and they have also a positive economical ef fect (e.g. paper recycling). It causes the paper alterations, which results in the degr adation of their physical and mechanical properties. The recycling causes a chemi cal, thermal, biologi cal and mechanical destruction, or their combination. The aim of this work was to investigate changes of macromolecular weigh...