Structure, Working Principle, Advantages and Influencing Factors of Hydraulic Pulper

The hydraulic pulper is the main processing equipment used to treat pulp board, broken paper and waste paper. The hydraulic pulper can be vertical and horizontal.

pulping machine

Structure of hydraulic pulper

The main part is the turntable and the tank. In the vertical hydraulic pulper, the turntable is located in the center of the bottom of the disk, and there are several impellers (or blades) on the disk, and a fixed disk with multiple blades is installed around the disk body. The turntable is driven by a motor located below the rotating shaft, and a sieve plate with holes is installed on the bottom of the groove near the turntable to communicate with the discharge port.

The turntable, fixed plate and sieve plate of the horizontal hydraulic paper shredder are all located on the side of the tank.

High consistency hydraulic pulper

Working principle of hydraulic pulper

Due to the rotation of the turntable, the crushed pulp board, broken paper and waste paper will collide with the blade by the centrifugal force generated by the turntable and be thrown to the edge of the tank to form a horizontal vortex. It rises along the edge again, and then falls back to the turntable. Then a negative pressure zone is formed in the center of the tank. This cycle forms a vertical vortex, causing the slurry to come into contact with the blade back and forth and continue to be broken.

At the same time, because the slurry thrown by the turntable flows outward, the linear velocity gradually slows down to form a speed difference, which causes friction between the slurries and further breaks the slurry.

Pulping principle for egg tray production line

Advantages of hydraulic pulper

  • It only dissolves the fiber without cutting it.
  • High production efficiency, short unwinding time and low power consumption.
  • The structure is simple, the maintenance is convenient, the cost is low, and the floor space is small.
  • Convenient operation, wide application range, and can process a variety of waste paper and pulp paper.
  • Can realize continuous and automatic operation.

Its disadvantage is that the pulp contains more small pieces of paper after disintegration, which affects the quality of the pulp.

pulping machine

Influencing factors of hydraulic pulper

  1. Temperature

After the temperature is increased, the waste paper is softened, and the slurry easily absorbs moisture and disintegrates, especially those re-sized paper or printing paper containing ink. In addition, the viscosity of the pulp decreases due to the increase in temperature and has good fluidity, thereby promoting the disintegration of the pulp.

        2.Concentration

In the case of ensuring good circulation of the slurry, it is advantageous to increase the disintegration concentration. It is known from experiments that the concentration has a linear relationship with the power consumption, but the energy consumption per unit output decreases with the increase of the concentration, and it has little effect on the disintegration effect and the disintegration time.

        3.Disintegration time

Under certain operating conditions, there must be an effective disintegration interval. Beyond this interval, the increase in the disintegration rate will be very small; it is uneconomical to try to extend the time to improve the disintegration effect. Therefore, the disintegration time must be controlled to make it operate within the effective time range.

        4.Raw material

Due to the difference in water absorption and swelling capacity and fiber binding capacity of various slurries processed, the disintegration effect is different. It shows that different slurries have different disintegration rates in the same time.

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