The headbox is known as the "heart" of the paper machine. It is the key component of the paper machine. The function of the headbox in papermaking is to send the pulp that meets the requirements to the forming wire according to the requirements of the forming part of the paper machine, so as to provide the necessary prerequisite for the good forming of the paper web.

(1) Remove as much moisture from the paper web as possible with the help of mechanical pressure.(2) Reduce steam consumption in the drying section.（3) Increase the binding force of fibers in the paper web, and improve the tightness and strength of the paper.

Whether a piece of equipment is operating normally, its key components play a very important role. The jumbo press roll is one of the more important parts in the paper machine. If there is a failure, it must be repaired in time to avoid delays in production.