Abstract
In this study, a new apparatus for measuring the air permeability of wood-based panel specimens without using water displacement was developed with the aim of decreasing the influence of variation in atmospheric pressure on permeability measurement. Validation experiments were conducted using plywood, oriented strand board (OSB), particleboard, and medium-density fiberboard (MDF) panels and a control specimen sealed with an epoxy resin. The background (leakage) flow of the apparatus was evaluated based on the experimental results of the control specimen. A methodology for the determination of air permeability based on Darcy’s law for gases and the evaluated background flow rate was proposed. The results of the current study were compared with those obtained in a previous study, indicating that the new method provides valid measurements for wood-based panels with high and low air permeability. No significant influence of variation in atmospheric pressure on the experimental results was observed, suggesting that the proposed method is suitable for a long-term continuous experiment for evaluating a specimen with extremely low permeability
Highlights
Several methods for measuring the air permeability of wood have been developed (Resch and Echlund 1964, Choong and Fogg 1968, Petty and Puritch 1970, Perré 1987, Siau 1995, Perré 2007, Ai et al 2017)
During the experiments for woods of very low permeability using this method, a long-term experiment is necessary in order to decrease the difficulty in measuring a small increase in water level inside a transparent glass tube before and after water displacement
According to the author’s experience, variation in atmospheric pressure during the experiment is quite influential on the readings of the water level inside the glass tube
Summary
Several methods for measuring the air permeability of wood have been developed (Resch and Echlund 1964, Choong and Fogg 1968, Petty and Puritch 1970, Perré 1987, Siau 1995, Perré 2007, Ai et al 2017). During the experiments for woods of very low permeability using this method, a long-term experiment is necessary in order to decrease the difficulty in measuring a small increase in water level inside a transparent glass tube before and after water displacement. A new apparatus without using water displacement for measuring air permeability was built from common lab instruments with the intention of decreasing the influence of variation in atmospheric pressure on permeability assessment. The influence of variation in atmospheric pressure on permeability assessment and suitability for a long-term continuous experiment for the evaluation of specimens with extremely low permeability was discussed
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