Introduction
Refining in pulp stock preparation aims to design fibers for papermaking and desired properties. High Consistency Refiners are crucial for virgin chemical pulp stock preparation. Recycled fibers typically aim for strength increase at low Schopper Riegler increase and shive elimination or reduction.
High Consistency Refiner Overview
High Consistency Refiners operate at above 30% consistency, focusing on shear force effects between fibers. The process preserves fiber length, resulting in dynamic strength, elongation, and porosity benefits. These refiners can operate without steam heating.
Types of High Consistency Refiner Machinery
Conical Refiner
Single-disc cantilever refiner with hydraulic positioning featuring a flat inner refining zone and conical outer zone with regulated disc clearance.
Single Disc Refiner
Early refiner type still used in new installations, distinguished by lowest operating costs and smallest available capacities.
Double Disc Refiner
Popular for high-consistency refining due to economical operation, easy maintenance, and wide pattern variability with peripheral speeds of 25 ms.
TMP - A High Consistency Refiner System
Thermo Mechanical Pulping uses high temperature to soften lignin and generate steam, reducing electrical energy consumption. The process includes refiners consuming 30 to 45% of total energy. Mills can reduce energy by incorporating low-consistency refining treatments.
Conclusion
High Consistency Refining is essential for balancing stock and paper properties in the industry, with various machinery types offering cost-effective solutions and energy-saving benefits.
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