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1 Rubleva Olga

1 2019

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Structural changes of Scots pine wood caused by local pressing in the longitudinal direction

Rubleva Olga

Drewno : prace naukowe, doniesienia, komunikaty

2019

vol. 62, nr 204

23--39

An indentation can be formed when inserting a punch along wood fibers at the ends of blanks. The aim of this research is to study structural changes during local compression of wood in longitudinal pressing. Punches of prismatic shape were inserted into samples of Scots pine wood with different moisture content. The stages of wood deformation during the process were analyzed. The author then evaluated changes in the macrostructure of the wood and determined the conditions for obtaining a good-quality indentation. This led to a regression model enabling prediction of the depth of the densified zone. Its size is no more than 105% of the depth of penetration. Images of the densified zone were obtained using a scanning electron microscope, and changes in its microstructure were evaluated. The process of forming a “core” causes uncritical structural changes in the boundary undeformed sections. This underlines the possibility of using local pressing technology along the fibers as an alternative to traditional milling or drilling in order to form grooves and blind holes, for example for such joints as tongue and groove or mortise and tenon.