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Paavo J. Ollinmaa

Koivun vetopuun anatomisesta rakenteesta ja ominaisuuksista

Ollinmaa P.J. (1955). Koivun vetopuun anatomisesta rakenteesta ja ominaisuuksista. Acta Forestalia Fennica vol. 64 no. 3 article id 7463. https://doi.org/10.14214/aff.7463

English title: On the anatomical structure and properties of the tension wood in birch.


The investigation concerns with the strength of the eccentric growth accompanying formation of tension wood in silver birch  (Betula pendula Roth.) and downy birch (Betula pubescens Ehrh.), behaviour of wood in wood-working machines and its macroscopic characteristics, its microscopic and sub-microscopic structure, chemical composition, resistance against certain chemicals, physical properties, and the strength characteristics of wood.

The most detrimental properties of tension wood used in wood working industry are high longitudinal shrinkage, warping, twisting and checking. The wooliness of the cut is unwanted, for instance, in plywood and furniture. In pulp industry tension wood is better raw material than normal wood because it yields more and purer cellulose than normal wood. However, it has poorer strength properties.

The PDF includes a summary in English.

Original keywords
koivu; rauduskoivu; hieskoivu; rakenne; sahaus; selluloosa; kemialliset ominaisuudet; vetopuu

English keywords
tension wood; birch; downy birch; silver birch; Betula pendula; Betula pubescens; structure; chemical properties; pulp; sawing; technical properties

Published in 1955

Available at https://doi.org/10.14214/aff.7463 | Download PDF

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