●Tooth width

  The tooth width of low-consistency grinding discs has no certain rules. Under the condition of a certain tooth width + groove width, when dealing with free slurry, consideration should be given to appropriately reducing the tooth width and correspondingly increasing the groove width to weaken the squeezing friction effect of the tooth surface and enhance the cutting ability. When dealing with viscous slurry, consider increasing the tooth width and reducing the groove width to enhance the tooth surface effect and suppress the cutting effect, thereby enhancing the filament brooming ability.
  ● Groove width

  Considering that the slurry fibers flow smoothly in the groove, and there is enough space in the grinding plate groove to form the necessary eddy current, so that the fibers frequently exchange between the groove and the tooth surface, and are continuously beaten, the width of the groove is It is best to choose a fiber that is equal to or slightly larger than 2 to 3 times the average fiber length of the treated pulp.

  ●Tooth height

  During the beating process, the teeth of the grinding disc must bear bending load during operation. For the sake of strength and service life, the tooth height of the grinding disc is generally limited to 1 to 2 times the tooth width. If it is too high, the slurry will not be easily exchanged between the grooves and tooth surfaces of the grinding disc, and the fibers will not receive the beating effect. At the same time, the teeth may be cracked due to the teeth being too high and not strong enough. However, if the tooth height is too low, the service life of the grinding disc will be short and the throughput of the grinding disc will be affected. Generally, the tooth height of the grinding disc is 5.5~7.5mm. To deal with viscous slurry, choose a lower one, and to deal with free slurry, choose a higher one.

  ●Tooth profile angle

  The tooth profile angle refers to the angle between the teeth of the grinding disc and the radius. This angle has a great influence on the pumping effect of the grinding mill. When the tooth profile angle increases, on the one hand, the number of teeth on a grinding disc of a certain specification will increase, the beating effect will be enhanced, and there will be a tendency to inhibit cutting. On the other hand, as the pumping effect increases, the effective power used for beating the pulp decreases accordingly. Therefore, the tooth profile angle is generally controlled at 10°~20°. When dealing with viscous pulp or short fibers that do not require cutting but only need to be loosened, the angle should be larger. When dealing with free pulp, fibers must be cut and the tooth angle should be smaller.
  ● Slurry retaining ring (also known as “slurry retaining ring”)

  The function of the pulp ring is to allow fibers to exchange between the grooves and tooth surfaces, and to prevent the fibers from passing directly through the grinding area without being processed. However, setting up the pulp ring will generally reduce the throughput of the mill and thereby reduce the product of the mill. At present, the gear ring is divided into open gear and dark gear. The difference between them is the height of the gear ring. The different functional characteristics of these two types of pulp stalls are mainly in guiding the pulp flow.