PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 1, Number 1, 2015
Description The measurement is designed for online use in the challenging tissue machine environment. Fast image capture allows reel speeds up to 2600 m/min (8530 ft/min) without reduction of image quality. The measurement automatically adjusts illumination and imaging parameters for varying speeds. An intelligent operating algorithm mitigates the effect of uneven illumination, ambient light, and dirt/dust build-up. Images are captured and analysed at the rate of 10 Hz. Folds/length reports crepe folding per length unit (typically inches or centimetres). This correlates with creping blade wear: new blade produces high folds/length and worn blade low values. Macro and Micro Crepe indicate folding types categorised as in long and short wavelengths. Caliper indicates crepe dominant sheet thickness. With new blade macro and caliper are typically low and micro high. As the blade wears, macro and caliper will increase and micro decreases.
The system displays the latest captured surface image to operator for visual analysis.
Folds per inch. Upward peaks occur after creping blade change
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Article 6 – Tissue (crepe structure)
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