Abstract:

Horizontal density variation is a structural phenomenon of non-veneer wood composites. The variation and distribution characteristics of horizontal density have impacts on the products properties. In this study, veneer strip simulated flake boards with four density distribution were made using a mat model. The density variation of the modeled mats was discussed, as well as the relationship between sample size and density variation. The effects of density and density distribution of non veneer composites on the internal bond strength were analyzed. Result shows: the horizontal density of random formed particleboard follows Normal distribution. Density has remarkable influence on internal bond strength (IB). Increasing density helps to improve IB at lower density stage, but has negative impacts on IB at higher density stage. Density variation between testing specimens depends on their sizes. Suitable specimen size increase can decrease the variation of the internal bond strengths.

Key words: Horizontal density distribution, Internal bond strength, Non-veneer wood composites, Model