Effect of Panel Moisture Content on Internal Bond Strength and Thickness Swelling of Medium Density Fiberboard

Polymers

Samaritana Costa¹  Nádia Paiva¹  JoãoM. Ferra¹  Roberto Magalhães¹  Beatriz Nogueira¹  Jorge Martins²  LuisaH. Carvalho²  FernãoD. Magalhães² 

[1] EuroResinas—Indústrias Químicas, 7520-195 Sines, Portugal;LEPABE—Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal;

关键词: wood-based panels;    commercial MDF;    storage conditions;    physico-mechanical properties;   

DOI  :  10.3390/polym13010114

来源: DOAJ

【 摘 要 】

Wood-based products usually have serious limitations concerning contact with water, both because wood is a hygroscopic material and because the commonly used binder has low moisture resistance. This paper studies the effect of panel moisture content (MC) on the physico-mechanical properties of medium density fiberboards (MDF). Several commercial MDF boards produced in Europe were stored at room temperature and relative humidity (RH) for 9 weeks (approx. range 15–20 °C and 50–85% RH). Every week, a strip of each MDF board was cut out, divided into 5 × 5 cm test pieces and its internal bond strength (IB) was measured. A strong influence of MDF moisture content on internal bond strength was observed and therefore IB test pieces were stored in a climatic chamber (either at 20 °C, 55% RH and at 20 °C, 70% RH). A decreasing linear relation was established between IB and MC. It was found that this effect is reversible: after drying, internal bond strength rises again (following a slight hysteresis). This work reinforces the importance of conditioned storage before board properties analysis, as described in European Standard EN 319.

【 授权许可】

Unknown