Prototype Model 2800 DME

For immediate release 20 May 1999

Pullman, WA—Metriguard today introduced the 2800 DME veneer tester, a state-of-the-art grading machine for veneer producers and manufacturers of laminated veneer lumber (LVL) that measures density, modulus of elasticity (E) and moisture content in addition to ultrasonic velocity and sheet width. The new model 2800 DME can operate at speeds considerably faster than previous models.

The machine, which is installed in-line with a mill’s dry veneer conveyor system, uses ultrasonic impulses from rolling transducers to determine ultrasonic velocity, the distance divided by the Ultrasonic Propagation Time (UPT), of structural veneer. Using a radio frequency density measurement device, the 2800 DME measures density (specific gravity) and moisture content from which it calculates the material’s modulus of elasticity. This allows manufacturers to sort on the basis of E, providing better control over the characteristics of the veneer and of the final LVL.

"By controlling the properties of the veneer, you can control the properties of the laminated veneer lumber," said Metriguard president Jim Logan. "Improvements in the measurement of veneer properties generally improve the recovery of material."

Since the temperature of the material affects the ultrasonic velocity, Metriguard has incorporated an infrared thermometer allowing for a thermal compensation adjustment on each individual sheet of veneer.

With this combination of measurements, the new machine will improve the ability to control LVL properties and may eliminate the need for additional moisture meters. The 2800 DME has built-in width detection and is equipped with easy-to-use software. No other veneer tester available measures veneer properties as accurately and thoroughly as the 2800 DME.

Veneer producers have long been concerned about the production speed when measuring product. In response to this concern, the 2800 DME was designed to be much faster than previous designs. Incorporating a digital signal processor for ultrasonic measurement, initial testing shows the machine can process wood at 300 feet per minute with ultrasonic velocity—50 percent faster than the previous designs, and also measure density and modulus of elasticity at the same time. Some models of existing machines can be upgraded with new electronics and sensors.

The 2800 DME is also easy to install. Designed to separate in the middle like a sandwich, the lower portion can be installed under a conveyor line after which the top portion is set in place. This provides for minimal disturbance of the existing conveyor system in a mill.

"The 2800 DME is a major advance in veneer testing equipment," Logan noted. "It offers superior control over E which will lead to improved LVL, reduced waste and faster mill operations. It is an important addition for any veneer producer or LVL manufacturer."

The first 2800 DME ultrasonic structural veneer tester will be installed for initial plant tests in May and production is expected to start in the August to September 1999 time frame. For more information on Metriguard’s 2800 DME and other veneer testing products, contact Metriguard Inc, at PO Box 399, Pullman, WA 99163, or call (509) 332-7526; or fax (509) 332-0485; e-mail sales@metriguard.com; or visit on the web at www.metriguard.com.