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Matti Kärkkäinen

Malli männyn, kuusen ja koivun puuaineen oksaisuudesta.

Kärkkäinen M. (1986). Malli männyn, kuusen ja koivun puuaineen oksaisuudesta. Silva Fennica vol. 20 no. 2 article id 5266. https://doi.org/10.14214/sf.a15445

English title: Model of knottiness of wood material in pine, spruce and birch.

Abstract

A computer model was developed for predicting knottiness of wood material of Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst.) and birch (Betula 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.

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.

The PDF includes an abstract in English.

Original keywords
mänty; kuusi; rauduskoivu; hieskoivu; oksaisuus; simulointi; aihion poikkileikkaus; puutavaran laatu

English keywords
Scots pine; Norway spruce; birch; Pinus sylvestris; Picea abies; Betula; simulation; knottiness; knots; timber quality

Published in 1986

Available at https://doi.org/10.14214/sf.a15445 | Download PDF

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