Abstract
Abstract This paper is a review of the development of the mechanical pulping process with focus on refiner-based processes. The intention is to provide an overview of the trends and the major advances in the development of the mechanical pulping (MP) process. The focus is on the development of the entire MP process, rather than the refiner as such. However, when discussing the MP process development, it is inevitable to consider the development of the refiner unit operation briefly. Processes for printing papers based on softwood is mainly discussed, but board processes are discussed briefly as well.
Highlights
This paper is a review of the development of the mechanical pulping (MP) process with focus on refiner-based processes
When refiners were introduced for production of mechanical pulp, fractionation systems similar to those used for stone groundwood (SGW) were adopted (Klemm 1957, Rydholm 1965, Figure 14: A Sprout Waldron refiner mechanical pulp (RMP) process at the Kawerau Mill, New Zealand; Redrawn from Rankin (1977)
The concept with combined rejects and second stage main line refining that was performed with LC refiners even better in printing than the normal newsprint produced with a conventional single disc (SD) thermomechanical pulping (TMP) process
Summary
This paper is a review of the development of the mechanical pulping (MP) process with focus on refiner-based processes. Almost all refiner-based MP lines consists of four major process sections shown in Figure 2: chip preconditioning, main line refining, fractionation/cleaning and reject treatment.
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