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Gewählte Master / Diploma Thesis:

Stephan Michael Frybort (2006): Charakterisierung der stirnseitigen Verklebung bei Massivholz.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 120. UB BOKU obvsg

Data Source: ZID Abstracts
This thesis is the result of a research of the new developed light weight board DENDROLIGHT® produced by the company BERGER. The three layer sandwich construction consists of a hollow chamber middle layer with the grain orientation perpendicular to the two surface layers. The board is made of spruce (Picea abies). Basically the author tried to find the factors which are responsible for the functioning of gluing longitudinal grain with end grain. In addition, the author tried to find the adequate adhesive for this kind of gluing. In the Beginning of this work it was assumed that the adhesive fillet, which originates between middle- and surface layer, is responsible for the bonding strength. Therefore the different parameters, which are able to describe the characteristics of the used adhesives in regard to the formation of the adhesive fillet, have been analysed. Afterwards, the levied parameters where analysed for their suitability to describe the determined parameters but also the transverse tensile strength of the board. The parameters of the used adhesives, like viscosity, service life, adhesion joint-thickness, penetration depth, behaviour of penetration, wetting angle and the change of contact angle in time where analysed to describe the different adhesive fillets and to identify the adequate adhesive, in regard to the formation of the desired adhesive fillet. The correlation of the parameters with the strength of the board showed, that the parameters have a limited ability to describe the bonding strength. These results show that joints made by end grain gluing are possible. The strength of this joint is therefore the result of the improved properties of modern adhesives.

Beurteilende(r): Teischinger Alfred

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