Inflow Pre-net Screen

In the paper industry, "Inflow Pre-net Screen" is a crucial screening equipment that plays a key role in the papermaking process. Its main function is to conduct fine screening and purification of the pulp just before it is sent to the forming wire for sheet formation. It removes impurities, fiber bundles, undispersed fiber masses, and other undesirable components that may affect the paper quality, thereby enhancing the quality and uniformity of the pulp. This provides high-quality pulp for the subsequent papermaking procedures and ensures the production of high-quality paper.

It is mainly used for the screening of low consistency pulp before the paper machine.lt can effectively remove impurities and break up the pulp materials to increase paper quality.

Upside-down core structure ensure steady speed of pulp passing through screen slot; Wide accepted pulp outlet makes the pulse decrease quickly; Heavy particles and impurities flow in the outer area of the screen ,screen will not be blocked; High capacity & low energy consumption.

1.Inflow Method

The pulp enters from the outside of the equipment and flows inward under pressure, passing through the screen mesh for screening.

This inflow design enables the pulp to have sufficient contact with the screen mesh, improving the screening effect and accuracy.

2.Screening Mechanism

It is equipped with fine and uniform screen meshes, and the pore size is precisely designed according to the screening requirements.

When the pulp passes through the screen mesh, the fine fibers and good pulp that meet the requirements can pass smoothly, while the larger impurities and fibers that do not meet the requirements are intercepted on the surface of the screen mesh.

3.Pressure Control

It has an advanced pressure control system that can precisely regulate the flow pressure of the pulp.

The appropriate pressure helps the uniform flow and screening of the pulp and can be flexibly adjusted according to the characteristics of the pulp and production needs.

1.Inlet

Located on the outside of the equipment, it is used to receive the pulp to be screened and is usually designed with a homogenizing device to ensure the pulp enters the equipment evenly.

2.Screen Frame and Screen Mesh

The screen frame is usually made of strong metal materials to provide support and fixation for the screen mesh.

The screen mesh is made of high-strength, wear-resistant materials with good screening performance to ensure long-term stable operation.

3.Outlet for Good Pulp

Located inside the equipment, it is used to discharge the screened high-quality pulp and is connected to the subsequent papermaking processes.

4.Reject Outlet

Located on the outside of the equipment, it is used to discharge the intercepted impurities and unqualified fibers.

5.Pressure Regulating Device

Includes pressure sensors, regulating valves, and other components for real-time monitoring and adjustment of the pressure inside the equipment.

1.High-Precision Screening：It can effectively remove tiny impurities and undesirable fibers, providing highly pure and uniform pulp.

2.High Processing Capacity：It can handle a large amount of pulp in a short time to meet the high-output requirements of the papermaking production line.

3.Stable Operation：The structural design is reasonable, and the key components are of reliable quality, enabling stable performance during long-term continuous operation.

4.Strong Adaptability：It can adapt to different types, concentrations, and qualities of pulp and achieve the best screening effect by adjusting parameters.

5.Easy Maintenance：Each component is easy to disassemble and install, facilitating daily inspection, cleaning, and maintenance work.

1.Operation Key Points

Before starting the machine, the operator needs to conduct a comprehensive equipment inspection, including the connection of each component, the normality of the pressure system, and the integrity of the screen mesh.

According to the production process requirements, accurately set parameters such as inlet pressure, flow rate, and reject frequency.

During operation, closely monitor the operating status of the equipment, such as pressure, flow rate, and the quality of the outlet pulp, and promptly detect and handle abnormal situations.

2.Maintenance Work

Regularly clean the inlet and reject outlet to prevent clogging.

Regularly inspect and replace the screen mesh to ensure the screening accuracy.

Regularly calibrate and maintain the pressure regulating device to ensure its accuracy and reliability.

Lubricate and inspect the transmission components of the equipment to prevent wear and failure.

Establish detailed equipment maintenance records, including maintenance time, maintenance content, and replaced components.

1.Improve Paper Quality：By removing impurities and undesirable fibers, the paper surface becomes smoother and more uniform, improving the strength and printability of the paper.

2.Protect Papermaking Equipment：Provide pure pulp to reduce wear and damage to subsequent papermaking equipment, lowering maintenance costs.

3.Optimize the Production Process：The stable screening effect helps improve the efficiency and stability of the entire papermaking production line, reducing production interruptions and quality fluctuations.

4.Reduce Production Costs：Increase the utilization rate of pulp, reduce the reject rate, and lower the maintenance and operating costs of the equipment.

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