Study on reaction wood

Ollinmaa, Paavo J.

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Paavo J. Ollinmaa

Reaktiopuututkimuksia

Ollinmaa P. J. (1959). Reaktiopuututkimuksia. Acta Forestalia Fennica vol. 72 no. 1 article id 7118. https://doi.org/10.14214/aff.7118

English title: Study on reaction wood

Abstract

Compression wood of the tree species studied in this investigation, Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karst.) and common juniper (Juniperus communis L.), was found to be characterized in its cross section by the thick walls and rounded shape of its tracheids and the profuse occurence of spaces. Tension wood of aspen (Populus tremula L.) and alder (Alnus incana (L.) Moench) was found in microscopic examination to be characterized by the gelatinous appearance of the wood fibres, by its small cell cavities and by the thickness and buckling of the inner layer of the cecondary wall. Tracheids of the compression wood were found to have shorter length than normal on an average, while the tension wood fibres were found to be longer.

The microchemical studies suggest a higher than normal lignin content in compression wood and lower than normal lignin content in tension wood, as compared to normal wood. The reverse would be true for the cellulose contents. Volume weight of absolute dry reaction wood was distinctly higher than that of normal wood. The longitudinal shrinkage of reaction wood, particularly of compression wood, is several times that of normal wood. Transversal shrinkage of compression wood is much less than normal wood. Swelling tests revealed pushing effect of compression wood on elongation and pulling effect on tension wood on constraction. Volume shrinkage of compression wood is less than that of normal wood, in contrast to tension wood. The strength of compression wood in absolutely dry condition was nearly same as that of normal wood.

The PDF includes a summary in English.

Original keywords
kuusi; mänty; havupuut; kataja; haapa; reaktiopuu; vetopuu; lujuus; leppä; kutistuminen; lehtipuut; lylypuu; ligniini

English keywords
Populus tremula; Pinus sylvestris; Norway spruce; Picea abies; Scots pine; compression wood; lignin; mechanical strength; Alnus incana; tension wood; shrinkage; Juniperus communis; raction wood; common juniper

Published in 1959

Available at https://doi.org/10.14214/aff.7118 | Download PDF

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