Cereal straw and bagasse are presently the leading non-wood plants used in production of paper, though many fast-growing perennial plants have been studied for their suitability for paper manufacturing, too. In the present study the use of Japanese knotweed, as one of the most invasive alien plant species in Slovenia, as alternative raw material for papermaking is demonstreted. Paper was made of 55% Japanese knotweed and sulfate cellulose produced from 60% eucalyptus and 40% conifer fiber. The paper with the basic weight of 90 g/m 2 was manufactured on the pilot paper machine at the Pulp and Paper Institute. Among printability characteristics paper brightness, colour, yellowness, roughness, air permeability, specular gloss, print penetration, picking, and print unevenness were determined. The preliminary research has shown, that Japanese knotweed, as a cheap local raw material, could be used in paper making industry, though the fiber processing and paper making process must be improved in order to obtain good printability.
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