Causes and Treatment of Refiner Disc Wear and Tooth Breakage
During the pulping process, many factors influence paper uniformity, including raw materials, pulp ratio, beating degree, and fiber wet weight. However, when troubleshooting problems, we often overlook the disc refiner's operating status, beating method, and its core component—the refiner disc. Refiner disc wear, particularly serration wear, is often a contributing factor to poor paper uniformity. Sun hong analyzes the refiner disc based on its tooth shape, material, slurry concentration, etc. and summarizes the causes and corresponding solutions for you.
Uneven Wear in the Refining Zone of a Double Disc Refiner Leads to Uneven Pulp Production
The double disc refiner is the most widely used continuous pulping equipment in paper mills. It consists of two fixed refiners attached to the housing and a movable base, and two rotating refiners mounted on a rotating disc, forming two refining zones. Adjusting the current, flow rate, pressure, pulp concentration, and interchanging refiners with different tooth profiles and beating processes allows it to meet various pulping requirements. However, in production, the refiner disc in the two grinding zones often wear unevenly, affecting the pulp uniformity and equipment stability.
The Following are Factors That Cause Side Wear and Eccentric Wear of the Refiner Disc
If the double disc mill with two pulp inlet pipes is not designed and installed properly, it will lead to uneven flow and pressure on both sides.
If the double disc mill with a single pulp inlet pipe has low pulp pressure or lack of pulp in the second grinding area.
Improper or lack of lubricating grease for the moving seat, resulting in poor sliding.
The main shaft is not flexible in axial movement, the turntable spline is worn, etc.
The tooth shape of the refiner disc does not match, resulting in unstable pulp inlet and outlet pressure.
The pulp concentration fluctuates or the concentration is too high, resulting in pulp blockage or lack of pulp in the pulp inlet pipe on one side.
The material of the refiner disc, etc.
Wavy, Sawtooth Shaped Wear and Broken Teeth of the Refiner Disc Affect the Pulp Uniformity
Some refiners with poor impact resistance often experience unexpected large scale tooth breakage and uneven wear, which leads to the refiner being scrapped prematurely, especially in low concentration, high intensity pulping, causing the dynamic disc and the static disc to form wavy or sawtooth wear, and the dynamic disc and the static disc to wear in a meshing state, causing the pulping power to fluctuate and increase. Uneven wear also makes the refiner disc fail to reach its expected lifespan, affecting the pulping continuity and uniformity while increasing power consumption, seriously affecting the pulping quality and paper uniformity.
Solutions and Methods
Combined with the use of many pulping production lines, we provide several simple and easy solutions and methods:
Optimize the design and installation of the pulping system, keep the pulp clean, and prevent foreign objects such as stones, wires, and bolts from entering the grinding chamber.
When the equipment allows, control the appropriate power, concentration, pressure, etc., optimize the refiner disc to match the process, try not to use the circulating pulping process, and strive for one-time pulping.
Pay attention to the maintenance and care of the pulping machine to ensure smooth feed and flexible sliding of the turntable.
Select a refiner disc material with high impact resistance to prevent accidental tooth breakage, wavy, and meshing sawtooth wear.
Give priority to using whole-circle refiner disc to avoid slurry leakage caused by gaps in the assembly of fan-shaped split refiner disc and ensure uniformity.
Control the appropriate feed method, steps and current to prevent tooth breakage and severe wear that affect the pulping uniformity.
