Why are NDTs necessary in mill facilities?
The manufacture of sheet products is a complex process – and defective sheets can often slip through. The reasons are numerous and the results are costly. Blow claims cost the sheet industry millions of dollars annually – with individual mills often taking the hit for hundreds of thousands of dollars. Fortunately, there’s a simple and cost-effective solution: Miloptic non-destructive blow detectors. These have been the workhorse of blow detection in manufacturing since 1973.
How do Miloptic Systems Work?
Miloptic systems contain ultrasonic pressure pulse generators (transmitter transducers) – each pulsing at 60-80 times per second to form a continuous ultrasonic beam. When this beam is intersected by a blow or blister in a sheet product, the effect is similar to that of a mirror intercepting a beam of light and changing its characteristics. When the beam in our systems detect a defect, the beam is converted into an electric signal by the receiving transducers. Electronic modules then process the signal to determine if a defect exceeds the user’s determined size.
For defects detected, the Miloptic system triggers a predetermined control function, marker, or alarm. Each inspection channel consists of a transmitter transducer, a receiver transducer, a relay, and an electronic process module. Our system can manage up to twelve channels as required – and each channel can inspect a 1.7″ (43.2MM) wide strip, for the entire length of a sheet.