Original scientific paper

https://doi.org/10.5552/drvind.2021.2044

Effect of Artificial Ageing on Adhesive Bonds from Heat Treated Spruce

Mirko Kariz orcid.org/0000-0002-8088-2570 ; University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Ljubljana, Slovenia
Manja Kitek Kuzman ; University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Ljubljana, Slovenia
Milan Šernek orcid.org/0000-0002-9365-6126 ; University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Ljubljana, Slovenia

Abstract

The influence of artificial ageing on bonded heat-treated spruce lamellas was investigated. Heat-treated spruce lamellas with different degrees of thermal modification were bonded with PVAc and MUF and then exposed to 500 artificial weathering cycles, combined with rain, UV and IR radiation. The colour change of the exposed surface, weight change, delamination of the bonded joints and adhesive bond strength were measured. Artificial weathering caused cracking and delamination of the bonded joints and reduced the bond strength of both adhesives. The results show that delamination was higher for PVAc adhesive than MUF, but increased for both adhesives with the temperature of heat treatment of wood. The shear strength of bonds on the exposed side of the samples after the artificial weathering was lower than the average strength of the whole sample.

Keywords

heat treated spruce; adhesive bond; artificial ageing; shear strength; delamination; colour change

Hrčak ID:

265758

URI

https://hrcak.srce.hr/265758

Publication date:

24.11.2021.

Article data in other languages: croatian

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