%0 Article
%T Model of knottiness of wood material in pine, spruce and birch
%A Kärkkäinen, Matti
%D 1986
%J Silva Fennica
%V 20
%N 2
%R doi:10.14214/sf.a15445
%U https://silvafennica.fi/article/5266
%X <p>A computer model was developed for predicting knottiness of wood material of Scots pine (<em>Pinus sylvestris</em> L.), Norway spruce (<em>Picea abies</em> (L.) H. Karst.) and birch (<em>Betula</em> sp). The prediction included location of knots, their size and quality, i.e. if they are dead or living knots. The model suits best for tree species where branches are born at the base of shoots, in Finland such tree species is Scots pine.</p>
<p>The usefulness of the model was tested in the prediction of knots in wooden elements of joinery industry. According to the results, the shape of cross section affects the surface quality of elements. Especially useful is a quadratic cross section as it increases the probability to get a knotless surface.</p>
<p>The PDF includes an abstract in English. </p>