How do you increase bf of kraft paper?

To increase the burst factor (BF) of kraft paper, you can enhance its fiber quality by using longer, stronger fibers in the pulp mix, which improves the paper's tensile strength. Additionally, optimizing the refining process can increase fiber bonding, resulting in greater burst resistance. Adjusting the wet pressing and drying conditions can also help in improving the paper's density and strength. Finally, incorporating additives like wet-strength resins can further enhance the paper's performance under moisture conditions.