Apparatus and method for detecting inhomogeneities in semi-plast

Details Apparatus and method for detecting inhomogeneities in semi-plast Apparatus and method for detecting inhomogeneities in semi-plast

1990-01-05

1991-11-05

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73597, 73598, G01N 2900

Patent

active

050622994

ABSTRACT:
A method and apparatus is reported for detecting inhomogeneities in semi-plastic substances such as toilet bars containing soap. An ultrasound probe is utilized to test the substance at an exit orifice of an extruder. Best results are obtained by utilizing a ceramic ultrasonic probe, rectangular in shape including a transducer having a concave curvature on a lower surface thereof. The probe includes a theromplastic delay material. Ultrasonic waves directed through the probe preferably have a frequency between 1 and 2.25 MHz. Wedging of the extruded substance is also useful to improve contact with the probe as it passes through the extruder exit orifice.

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