Abstract
In a multi-step batch or continuous operating process, quantitative & qualitative optimization of every single step is always aimed at. Even the smallest aberration in processing parameters affects the quality of the fi nal product. Therefore, it is necessary to study time series quality of products delivered by every single step, so as to ensure product quality in a long run. Refi ning is one of the most crucial steps in fi breboard manufacturing, as it has a major impact on fi bre quality and energy consumption. Refi ning plate pattern is key to good results, which have to be optimized based on experience or onsite testing. We tested three different refi ning plate patterns: straight bar design pattern (TYPE 1), spiral bars design pattern (TYPE 2) and bar with groove pattern (TYPE 3), and their impact on fi bre size quality in a time series. Reported results include fi bre size distribution of three different types of plate patterns observed for 1500 hrs and relative quantity of fi ne fi bres observed in time series for three variants of disc type refi ners. Our research showed that fi bre quality within desired limits was best delivered by TYPE 2 plates; however, fi bre quality also varied with time series for three of them, so different time periods of desired fi bre quality were analysed.
Highlights
Our research showed that fibre quality within desired limits was best delivered by TYPE 2 plates; fibre quality varied with time series for three of them, so different time periods of desired fibre quality were analysed
Plate pattern has changed from classical constant angle type and bar with groove type to more advanced and improved types, for example curved refining bars with jagged leading sidewalls (Gingras, 2011), plates with logarithmic spiral type bars (Antensteiner, 2008), damless refiner plate for wood fibres (Savujz’irvi and Liifgren,1999), rough edged refiner plate cutter bars (Wasikowski,1996), tooth refiner plates having V-shaped teeth (Gingras, 2012)
The research provided solid ground for size-evaluation in time series, and size distribution of fibres produced by each refiner plate type was reported
Summary
Factors affecting the choice of a refiner can be divided into two categories, first refiner considerations and second system considerations. Refiner considerations include plate diameter, pattern design detail, surface and sub-surface dams, refining intensity (fibre type) and alloy. Plate pattern has changed from classical constant angle type and bar with groove type to more advanced and improved types, for example curved refining bars with jagged leading sidewalls (Gingras, 2011), plates with logarithmic spiral type bars (Antensteiner, 2008), damless refiner plate for wood fibres (Savujz’irvi and Liifgren,1999), rough edged refiner plate cutter bars (Wasikowski,1996), tooth refiner plates having V-shaped teeth (Gingras, 2012). Despite the efforts to find a computer model to design plates, in the end the selection is based on experience and onsite testing of the process (Rowell, 2012)
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