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1 Polish Journal of Chemical Technology

1 2006

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Various absorption properties of papers produced from pine and birch pulps

Werner A.E., Stanisławska A.J., Świekatowski W.B.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 4

88-90

The objective of this work was to investigate absorption properties with regard to the type of base paper. Papers of different hardwood to softwood fiber ratio were prepared and coated with K bars of a different wounded wire diameter, which assures various coatings thickness. Coated papers were dried under infrared heaters and stored in constant temperature and constant humidity room. Based on curves obtained during water penetration dynamics investigation, the absorption properties were determined. Cobb index was also measured. The lowest water absorption was found for the coatings applied on papers prepared from the softwood pulp. The increased content of hardwood fibers in the pulp was identified with the increase in the absorption properties. Moreover, it was found that - regardless of the basestock type - the increased coating thickness resulted in lower water absorption as well as in the decreased absorption rate. Cobb60 index measurements confirm the results obtained from the analysis of the penetration curves. Differences in absorption properties were attributed to various characteristics in the softwood and hardwood fibers.