Acta Forestalia Fennica vol. 64 | 1955
Category : Article
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.
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Ollinmaa,
E-mail:
po@mm.unknown
The objective of the investigation was to study the trends and fluctuations in the composition of sawn goods, changes due to business cycles, and casual fluctuations. The subject is confined to sawn softwood export to Great Britain, the Netherlands, Belgium and France (The North Sea countries) in 1920-1952. The data was based mainly on statistics of the Board of Customs, Series of Foreign Trade, Finnish Sawmill Owner’s Association and the Finnish Official Statistics.
The North Sea countries took 75-85% of the sawn softwood exported from Finland before World War II, and 50-70% of the quantity exported since the war. Sawn softwood export from Finland is almost exclusively long and small-dimension timber. The composition of the export from Finland to the North Sea countries was defined already during the 1900th century, and no big chances were observed even during the period of 1920-1952. The only definite trend was decrease in the proportion of u/s grade.
The PDF includes a summary in English.
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Ervasti,
E-mail:
se@mm.unknown
This paper aims at creating a picture of the tasks of forestry departments of those enterprises engaged in the wood working industry in Southern Finland, to analyse tasks performed by them and to discover the details from which the tasks have been built. In the first part of the work a general theory of organization study is dealt with from the point of view of structural research, and in the second part the results obtained are applied to the forestry departments.
The PDF includes a summary in English.
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Halmekoski,
E-mail:
mh@mm.unknown
