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Diagnostic of the degraded zones of fir beam situated in the st. Egidius' basilica in Bardejov

100%

Reinprecht L.

2009

tom 67

Colour changes of beech wood modified with essential oils due to fungal and ageing-fungal attacks with coniophora puteana

63%

Reinprecht L. , Hulla M.

tom vol. 58, nr 194

37--48

Fungal attacks on beech wood (Fagus sylvatica L.) samples (25 × 25 × 3) mm were performed using the brown-rot fungus Coniophora puteana over a period of 8 weeks, without or with their previous accelerated ageing in a Xenotest and a drying oven. Due to the fungal and ageing-fungal attacks, respectively, the top surfaces of the reference beech samples obtained a darker yellow-red shade according to the CIE-L*a*b* colour system. Similar changes in the colour coordinates L*, a*, and b* were found for the beech wood modified with the essential oils which were less fungicidal efficient – lavender, sage, tea-tree, and the oil-mixture. On the other hand, the colour changes in the beech wood modified with those essential oils which had a better fungicidal efficiency – birch, clove, oregano, sweet flag, savory, and thyme – were less significant, confirmed by Duncan’s test. Linear correlations with greater or lesser significance were established between the changes in the colour parameters (ΔL*; Δa*; Δb*; ΔE*) and the corresponding mass losses (Δm) of attacked beech wood, the best for positive Δb* which identified its yellowing.

Intensity of colour changes of spruce wood treated with selected coatings for windows during natural and xenotest weathering

63%

Panek M. , Reinprecht L.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2015

tom 89

Laboratory experiment with repairing of ends in spruce beams using modified Beta-method with carbon rods

51%

Reinprecht L. , Joscak P. , Sladkovic P.

2009

tom 67

Comparison of test methods for coatings on wood

51%

Pánek M. , Reinprecht L. , Čuchranová E.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

tom No. 88

187--192

The article compares two different testing methods of color changes of wood coatings with varying pigment content and varying surface quality before finishing. For both Xenotest as well as Exterior testing method were set up same conditions of wood surface and all samples were coated by the same amount of paint in three layers. Three different shades of paints were tested and then compared to reference sample without any finishing paint. We also tested influence of girt size to divergence of methods by using two different sizes of abrasives for preparation of finishing. Xenotest method is faster and has only slight differences in pattern of changes in comparison to exterior method but only in case of pigment paints. When transparent finishing patterns of changes were compared differences of methods were increasing while surface quality had very significant influence to color changes in case of Xenotest. To compare and predict quality of paint systems is more suitable to use faster Xenostest but on the other hand for obtaining exact values of color changes long term exterior tests are needed.