The rotor and screen plate of the hydrapulper are two core components in the hydraulper, which work together to achieve efficient crushing and screening of paper raw materials.
What are the Functions of the Rotor in a Hydrapulper?
- Transfer motivation: When the rotor rotates, it transfers motivation to the material inside the tank, causing the pulp to move and promoting fiber dissociation.
- Shredding raw materials: directly shredding bundles or pieces of paper, breaking down the structure of the paper and breaking it down into fibers.
- Strengthen mixing: By promoting the axial flow of the pulp, the circulation and mixing effect of the materials in the tank are enhanced, and the uniformity of crushing is improved.
- Auxiliary screening: In a pulper equipped with a pulp screen plate, the rotor can also clean the sieve holes through its special structure (such as blade tail design) to prevent the screen plate from clogging.
- Improve efficiency: New rotors (such as Vox rotors) can optimize pulp circulation, save power consumption by about 20% to 25%, and shorten pulping time.
- Reduce wear: The design of the rotor pulp chamber can create low-pressure flow, capture heavy impurities, thereby reducing wear on the cutterhead and screen plate, and extending equipment life.
What is the Function of the Screen Plate in a Hydrapulper?
The screen plate is usually installed at the bottom or side of the hydrapulper tank, and its core functions include:
- Screening of pulp: Allow the crushed pulp to flow out through the sieve holes, while intercepting large impurities such as unbroken paper sheets and fiber bundles, achieving preliminary separation.
- Support and control: In some designs, the screen plate can support the bed layer, control the movement speed and stratification space of heavy products (such as impurities), but this function is more common in screening equipment rather than the hydrapulper itself.
- Protecting downstream equipment: By intercepting large impurities, reducing the burden on subsequent processing equipment (such as fiber separators and trommel screen), and avoiding the impact of impurity fragmentation on pulp quality.
Coordinated Action of Rotor and Screen Plate in Hydrapulper
The combination of rotor and screen plate can significantly improve the efficiency of pulping:
The rotor generates turbulence through high-speed rotation, causing the pulp to circulate up and down in the tank, while the screen plate ensures timely discharge of qualified pulp and allows impurities to accumulate.
In a continuous production system, the distance between the rotor and the adjustable screen plate (such as in middle consistency pulper) can adapt to different concentrations of raw materials, achieving stable processing.
Some advanced designs, such as multi rotor or vertical and horizontal double pulpers, eliminate pulp blind spots and further improve the disintegration effect by optimizing the rotor motion trajectory and screen layout.
In short, the rotor is mainly responsible for crushing and stirring, while the screen plate focuses on screening and separation, both of which jointly ensure the efficiency and stability of the pulping process.
