Effects of Refiner Plates with Different Fillings on TMP Properties

This study conducted a comparative analysis of two refiner plates that had different bar patterns. The plates were designed with three distinct zones, including the high-intensity zone, the transition zone, and the low-intensity zone, and had a draft angle of 4-5 degrees. The two refiner plates had a significant difference in cutting edge length (CEL) of approximately four times. Specifically, TMP plate A (TP A) had a CEL of 5.1 km/s, while plate B (TP B) had a CEL of 22.7 km/s, indicating that TP A applied greater force to the wood chips during refining. TP A exhibited greater stock throughput at the same refining energy compared to TP B due to its smaller CEL. The low-intensity refining of TP B promoted the fibrillation of TMP fibers, leading to a large decrease in fiber width without significantly changing the mean fiber length before and after refining. The bulk of TMP and CTMP increased slightly more in TP B than in TP A. However, TP A showed a greater decrease in tensile strength due to a larger decrease in fiber length, whereas there was no significant change in tear strength between the two plates.

Automated summary

This study compared two different refiner plates with different bar patterns. The plates were designed with three zones - high-intensity, transition, and low-intensity, and had a draft angle of 4-5 degrees. The two plates had significant differences in cutting edge length (CEL), with TP A having a CEL of 5.1 km/s and TP B having a CEL of 22.7 km/s. TP A applied greater force and showed higher stock throughput compared to TP B. TP B promoted fibrillation of fibers, resulting in decreased fiber width without changes in mean fiber length before and after refining. TP B also had slightly higher bulk in TMP and CTMP, but TP A had a greater decrease in tensile strength due to decreased fiber length, while tear strength showed no significant change between the two plates.