Vergleichende Untersuchungen zum Brandverhalten der Borken von Föhre, Lärche und Robinie | Comparative studies on the firing behaviour of the bark of Scots pine, larch and black locust

Abstract

During firing experiments on the bark of Scots pine (Pinus sylvestris), larch (Larix decidua) and black locust (Robinia pseudoacacia) the temperature pattern was determined for the duration of the firing phase and the cooling-down phase in two measuring depths (8 mm and 12 mm). Additionally several wood physical (density, coefficient of thermal conductivity for varying temperatures) and anatomical (structure, cell wall / lumen ratio) properties were ascertained and the burning progress as well as the carbonisation documented. The temperature pattern showed a strong correlation between the burn-through-time and the density of the bark. Strong distinctions were apparent among the tree species. Black locust, with its very homogeneous and low density scale-fibre bark,showed a much steeper temperature pattern with a considerably higher temperature maximum than the scale bark of the conifers. The almost linear and slightly delayed temperature pattern in the pine bark might indicate a good opportunity for a possible industrial utilisation.