Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Measuring – testing – or inspecting
Patent
1998-12-08
2000-05-23
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Measuring, testing, or inspecting
264 83, 264109, 425135, 4251742, B27N 300
Patent
active
060662840
ABSTRACT:
Cure of the binder used to produce a lignocellulosic composite material in a press is monitored by (1) inserting a transmitter probe and a receiver probe into the composite-forming mixture at parallel points; (2) passing an ultrasonic signal from the transmitter probe through the composite-forming mixture to the receiver probe; (3) measuring the pulse velocity of the ultrasonic signal; and (4) comparing the measured pulse velocity to that of a standard (i.e., velocity of pulse through a composite article in which the binder is completely cured). When the measured velocity and the velocity of the standard are equal, the composite article is removed from the press. This technique is particularly useful for monitoring the commercial production of composite and engineered wood products.
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Duff Howard S.
Hunt Robert N.
McCracken Timothy S.
Thiem Terry L.
Bayer Corporation
Gil Joseph C.
Theisen Mary Lynn
Whalen Lyndanne M.
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