PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 1, Number 1, 2015
Ultrasonic measurement predicts paper performance ABB, the leading power and automation technology group, is providing a unique tool using ultrasonic technology that allows early prediction of paper and board materials performance, while facilitating the optimisation of key production processes. The L&W TSO Tester measures Tensile Stiffness Index (TSI) and Tensile Stiffness Orientation (TSO) properties on machine- or cross-machine profile paper samples cut out from the jumbo reel. The device works by sending an ultrasonic pulse across the paper and measuring velocity in eight different directions. The results predict the performance of paper used in a sheeting process, in a multi-colour printing process, in laser copying machines and when manufacturing corrugated board. A paper machine using the tester can easily achieve specifications for compressive, tensile and bursting strength. Typical trouble-shooting and prevention facilitated by the tool relate to the headbox, press and drying sections of the manufacturing process. In the headbox, for example, the device can help manufacturers to identify quickly whether action is required to manage pressure pulsations or deviating pressure profiles. The device can also be used to predict runnability in a range of applications. When making corrugated board, for example, the device enables manufacturers to avoid warping by ensuring the TSI/TSO measurement of the single face liner matches that of the double backer. Or, in multicolour printing where the hygro-expansion orientation needs to be carefully managed, the instrument’s TSO -angle measurement capabilities can help. “ By providing manufacturers timely access to key measurements, ” notes Thomas Fürst, Product Manager, ABB/Lorentzen & Wettre, “ papermakers can save on time and raw materials by catching potential issues early in the production cycle. ”
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