Chrome Roller Defect

SPCoop · Jul 27, 2017

I am currently working on a project for detecting and measuring “Gloss Bands” in chrome plated machine rolls. These “Gloss Bands” are essential a visual defect that is transferred onto the product. When viewing in certain lighting/angles, the surface appearance of the roll shows variation.

Any explanation for this? Appears the difference is undetectable by Gloss meter, leading me to believe the term “Gloss Bands” may be a misnomer.

Thanks.

Skogsgurra · Oct 3, 2017

Is the gloss meter the 45 degree in and 90 degree measurement type?

If so, they are not very good at detecting small variations. The eye is much better at that. What the meter is good at is to produce a measurement. But its resolution (ability to detect small variation) is crude. You may need to use a device that uses one or several angles to detect scattered light. And you will need as much light input as you can get from an LED. A collimator lens also usually does a lot good.

Gunnar Englund

http://www.gke.org

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