What are the advantages of a hydraulic headbox?

What are the advantages of a hydraulic headbox?
Hydraulic headboxes play a crucial role in paper machines, and their advantages are mainly reflected in the following aspects:
Uniform distribution of slurry flow:
A hydraulic headbox can generate a well dispersed, stable, and fully uniformly distributed slurry flow, which has the characteristics of small-scale and high-intensity turbulence, which helps to meet the requirements of high-speed mesh forming machines.
Adapt to high vehicle speeds:
The hydraulic headbox can meet the needs of modern high-speed paper machines, with speeds generally above 300m/min, and is also suitable for medium speed long mesh paper machines. Its efficient slurry rectification effect enables stable slurry flow to be maintained at high speeds.
Compact and efficient structure:
The design of the hydraulic headbox makes its volume relatively small, but the slurry rectification effect is good, and there is no rotating part, such as the homogenizing roller, which improves the overall efficiency.
Good paper uniformity and uniform distribution of banners:
Compared to other types of headboxes, hydraulic headboxes perform excellently in terms of paper uniformity and horizontal distribution uniformity. It avoids the problem of longitudinal pulp channels when exceeding the flow rate, thereby ensuring the quality of the paper.
Smooth and even surface:
The hydraulic headbox can ensure that the pulp is sprayed onto the mesh surface at a uniform flow rate and angle, thereby forming a flat and smooth wet paper page.
High adjustment accuracy:
Hydraulic headboxes generally use dilution water adjustment devices to improve the horizontal quantitative difference of paper. By adjusting the flow rate of dilution water, the horizontal quantification of the paper can be accurately controlled, and the response speed is fast and the sensitivity is high. This adjustment method helps to achieve automatic control through the QCS system of the paper machine.
To avoid permanent deformation of the lip:
Due to the lack of rotating parts in the hydraulic headbox, the problem of permanent deformation of the lip plate caused by mechanical wear is avoided. This helps to maintain the stability and uniformity of the slurry flow.
Control the rational directional arrangement of fibers:
The hydraulic headbox can control the reasonable directional arrangement of fibers, which is of great significance for improving the strength and performance of paper.
Reduce power loss:
The power loss caused by the rectification of the headbox and turbulence generator relies on the pressure brought by the main inlet pipe, and the design of the hydraulic headbox helps to reduce these losses and improve overall energy efficiency.
In summary, hydraulic headboxes have significant advantages in the papermaking industry and are an ideal choice for modern high-speed paper machines and medium speed long web paper machines. With the continuous improvement of paper machine speed and quality requirements for paper products, the application range of hydraulic flow boxes will also be further expanded.