As competition in the paper market intensifies, paper companies face significant cost pressures and risks of equipment downtime. How to quickly and stably re-feed paper after a paper breakage, thereby reducing unplanned downtime, has become a daily challenge we must address.
Today, we will explore how to quickly and stably re-feed and expand the paper width in the sizing section after a paper breakage on the paper machine. We aim to minimize the impact of paper breaks on production by optimizing the operational sequence.
As paper machine speeds increase and web widths expand, rapid paper re-feeding after a break becomes increasingly critical. Traditional surface sizing paper re-feeding methods typically involve first feeding the paper strip to the post-dryer, completing the widening process, and then closing the sizing rollers. This method requires 5 to 10 minutes to complete.
For paper machines using single water needle paper feeding, especially those producing paper grades below 100g, the following operational sequence is recommended: first complete the paper strip feeding, then close the upper and lower sizing beams to the sizing roll. This allows for inspection of the roll surface film formation, enabling timely resolution of any issues. Once stabilized, the sizing roll can then be closed. With this improvement, the entire paper feeding and widening process can be completed within 3 minutes.
For wide-width paper machines with dual water jets and a width exceeding 6600mm, the upper and lower sizing beams can be closed to the sizing rollers simultaneously during the paper feeding process. When preparing to expand the paper web to both sides, close the sizing rollers simultaneously and adjust the speed difference and tension. This prevents vibration of the wide paper web at the fan after sizing, ensuring a smooth transition from the sizing outlet to the post-dryer. The entire widening and roller adjustment process can be completed within 1 minute.
By adjusting the sizing, paper feeding, and widening sequence for different types of paper machines, not only can the success rate be improved, but the paper feeding time can also be significantly reduced, minimizing unplanned downtime and enhancing the operational efficiency of the paper machine.
