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 birchAbstract
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;
rakenne;
selluloosa;
sahaus;
rauduskoivu;
hieskoivu;
vetopuu;
kemialliset ominaisuudet
English keywords
birch;
Betula pendula;
Betula pubescens;
silver birch;
downy birch;
sawing;
technical properties;
structure;
tension wood;
pulp;
chemical properties
Published in 1955
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