Drill resistance is a measure of resistance to cutting of a material, which is affected by many factors, and the density of material is the most important factor. By using drill resistance test, the density profiles of wood with surface densification treatment could be obtained. Because different wood species has different drill resistance value, we couldn't get the relationship between the drill resistance values of different wood species. Particleboard with different density showed different resistance value, which could be tested by drill device. The size and position of defect in specimen could be tested by drill device.
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