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Composite Panel Products for Stage Scenery 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 John F. Hunt, P.E. Research Mechanical Engineer.

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Presentation on theme: "Composite Panel Products for Stage Scenery 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 John F. Hunt, P.E. Research Mechanical Engineer."— Presentation transcript:

1 Composite Panel Products for Stage Scenery 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 John F. Hunt, P.E. Research Mechanical Engineer USDA, Forest Products Laboratory, Madison, WI, USA

2 Overview Wood Composite Panels Wood and Moisture Effects of Moisture on Panel Properties Comments 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005

3 Chapter 10 from the Wood Handbook USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 Wood Composite Panels

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5 Wood-based Composite Panels come in a variety of configurations giving various performance properties USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 Wood Composites

6 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 All Plywood Panels are not equal. Plywood Properties by Species

7 Wood Composite Panels

8 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 Wood Composite Panels

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12 Sheathing Plywood Sheathing OSB Particle- board MDFHardboard Linear hygroscopic expansion 0.15% 0.35% Bending Modulus of Rupture (MPa) 20.7– –27.63 – – 41.2 Modulus of Elasticity (GPa) 6.89– – Tensile Strength (MPa) l0.3– –l Compression Strength (MPa) 20.7– –l0.3 Shear Through Thickness Shear Strength (MPa) 4.1–7.66.9–l0.3 Shear Modulus (GPa) 0.47– –2.00 Shear In-Plane Shear Strength (MPa) 1.7– –2.1 Shear Modulus (GPa) 0.14– – USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 Wood Composite Panels

13 Wood and Moisture Wood takes on moisture slowly but also gives up moisture even slower.

14 Determining the moisture content of a piece of wood from relative humidity and temperature measurements. Wood and Moisture

15 Determining the moisture content of a piece of wood from painting. For example, if 1 gallon of paint with 40% solids were painted at a rate of 1gallon/200ft^2. Then for: Hardboard: approximately 2% absorption of water into the face of the panel (½ to the board ½ to evaporation). Particleboard: approximately 0.5% absorption of water into the face of the panel (½ to the board ½ to evaporation). Wood and Moisture

16 Comments If possible stand panels on their side for a short period of time to all equilibrium moisture absorption. If possible apply similar coatings to both sides to prevent warping. For some panels warping is a wood problem and may be difficult to over come. Cyclic moisture warping effects will occur on a set due to daily air-conditioning settings and heating due to lighting or other sources.


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