Early crack detection
March 1st 2005

A system developed by Veritec Sonomatic provides early detection of cracks within the steel rolls and roller bearings used in the print industry.

The company points out that at some stage in the life of all pulp and paper plant, cracking in one form or another will occur within the steel rolls. Its says its nondestructive inspection techniques can detect such cracks even if rolls are lined.

Using Time of Flight Diffraction techniques Veritec can carry out in-site tests to detect small cracks on both the internal and external surfaces of the roll – even while the plant is still hot. This saves time waiting for the plant to cool.

This has been achieved with the development of a probe carrier that allows inspection of any diameter of roll (greater than 200mm) with an angle wrap from the screen, wire or felt of less than 200°.

The company has developed a range of techniques for the inspection of press bearerrings, including surface waves, compression waves and time-of-flight diffraction.

Data is collected, displayed and stored on the company’s Microplus Compact digital inspection system.

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