Untersuchungen an bewitterten Holzoberflächen

Sell, J.; Muster, Walter J.; Wälchli, Oskar

doi:10.1007/bf02607402

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…After 18 months of outdoor exposure, all uncoated plywood panels showed the typical grey discoloration of weathered wood. The formation of a uniform grey surface colour is attributed to the combined effect of photo-bleaching due to lignin decay and colonisation of the bleached surface by staining fungi such as Aureobasidium pullulans (Sell and Leukens 1971;Feist 1983;Schoeman and Dickinson 1997;Xie et al 2008;Evans 2008). The treatment of the veneers with both NMM formulations did not significantly change the colour of the resulting plywood panels.…”

Section: Surface Appearance Of the Uncoated Plywood Panelsmentioning

confidence: 99%

Modification of beech veneers with N-methylol melamine compounds for the production of plywood: natural weathering

2011

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Beech (Fagus sylvatica L.) veneers were treated with two formulations based on N-methylol-melamine (NMM): (1) NMM solution (NMM-1, 10% solid content), (2) fatty acid modified NMM dispersions containing paraffin (with an aluminium salt as catalyst, mNMM-2, 5% solid content). Five veneers were glued with a phenol formaldehyde adhesive to produce plywood. The plywood specimens were weathered outdoors over a period of 18 months according to EN 927-3 (2006). The moisture content of the treated plywood was clearly reduced during the exposure as compared to panels from water treated veneers (controls). As a consequence, the treated plywood displayed higher form stability and less cracks and delamination than the control plywood. Coated, NMM-treated plywood panels displayed remarkable lower degrees of discoloration than the coated controls. These differences between the treated, coated and the coated control panels were not so clearly observed in the case of uncoated panels. The treatment with NMM compounds additionally led to reduced surface colonisation by staining fungi on the indirectly weathered reverse sides of the plywood panels. Modifizierung von Buchenfurnieren mit N-Methylol-Melamin-Verbindungen zur Herstellung von Sperrholz: Natürliche Bewitterung Zusammenfassung Buchenfurniere (Fagus sylvatica L.) wurden mit zwei auf N-Methylol-Melamin (NMM) basierenden Formulierungen behandelt: (1) NMM-Lösung

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Section: Surface Appearance Of the Uncoated Plywood Panelsmentioning

confidence: 99%