Effects of a PFI refiner’s operational parameters on the swellability of recycled fiber, TAPPI Journal May 2020



Application: This work provides a mathematical equation to calculate the WRV of recycled fiber using the operational parameters of the PFI mill.

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Author: Xiaoning Shen, Bo Li, Wenxuan Mo, and Xin-Sheng Chai
Effects of a PFI refiner’s operational parameters on the swe
ABSTRACT: This paper presents data on the effects of operational parameters (number of revolutions, linear pressure, and gap) of the PFI refiner on the swellability of recycled fiber, which was characterized by water retention value (WRV). The results showed that the increase of recycled fiber’s WRV was proportional to the number of revolutions and the linear pressure, but inversely proportional to the gap. The mathematical relation between these parameters and the fiber WRV could be described by an empirical model for gaps greater than 0.1 mm. Scanning electron microscopic images of fiber morphology showed that the basic framework of fibers could be maintained with the gap greater than 0.1 mm, but was destroyed with smaller gaps. This model provides a technical reference for quantitative control of refining treatment and an effective method for improving recycled fiber quality.
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