Upm-kymmene Corporation

Kaarina Kekäläinen

Jukka Kotilainen

Harri Hiltunen

Jari Heikkinen

The invention relates to a method for manufacturing SCK paper having a basis weight in the range of 50 to 70 g/m, wherein an optimal combination of BSKP and BCTMP is used to adjust the properties of the fiber furnish. In SCK papers with low basis weight the bulk of the formed paper web upon paper manufacturing may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the SCK paper as substrate layer in a release liner. Thus SCK paper with exceptionally high share of BCTMP in the fiber furnish may be produced into the same thickness as was possible before for a conventional supercalendered kraft paper having a higher basis weight, while maintaining other quality characteristics of the paper sufficient for use as a substrate layer of an industrial release liner.

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Helsinki, Finland

Kaarina Kekäläinen