Fine Screen Up-flow Pressure Screen

In the paper industry, "Fine screen Up-flow pressure screen" is a crucial equipment used for the fine screening and purification of pulp. It plays a vital role in enhancing the quality of pulp, optimizing the production process, and guaranteeing the final quality of the paper. Its main function is to effectively remove fine impurities, fiber bundles, and insufficiently dissociated fiber masses from the pulp through meticulous screening, thereby significantly improving the quality and purity of the pulp. The high-quality pulp processed in this way provides a reliable raw material basis for subsequent papermaking processes, such as sheet forming and coating, ensuring that the produced paper achieves high standards in terms of physical properties, appearance quality, and printability.

Used for fine screening of waste paper stock.

This Pressure Screen change the drop flow screening mode of traditional pressure screen, pulp inflow from bottom, heavy impurities is blocked at the bottom and discharged out periodically, reduce the wear of screen cylinder and rotor, extend the service life of screen cylinder and rotor; in the process of pulp rising, fine light impurities is very easy to rise to the top and discharged out through tail pulp entrance, pulp through the strong cleaning of long rotor slice, screen quality and capacity can improve greatly. Compared with traditional Down-Flow Screen, impurities percentage of good pulp reduce to about 30%. The top of this equipment have no rises device, be convenient for customers to check and overhaul the screen cylinder and rotor.This equipment structure is reasonable, move stably, easy to operate, its screening techniques is the leader level in domestic products, and it can create a good economic benefit for customers.

1.Up-flow Design：The pulp enters from the inlet at the bottom of the screen body and flows upward along the inner wall of the screen drum under pressure. This unique up-flow method enables the pulp to be fully dispersed within the screen drum, increasing the contact area and time with the screen mesh and improving the screening efficiency.

Simultaneously, the turbulence generated during the up-flow process helps separate impurities from the fibers and promotes the impurities to approach the screen mesh, facilitating screening and removal.

2.Screening Mechanism：The surface of the screen drum is covered with a fine screen mesh, and its pore size is precisely designed according to the screening requirements. When the pulp flows upward, fine fibers and qualified pulp can pass through the pores of the screen mesh, while larger impurities, fiber bundles, and undissociated fiber masses are intercepted on the surface of the screen mesh.

The intercepted impurities, under the action of pressure and water flow, move upward along the surface of the screen mesh and are eventually discharged from the reject outlet, achieving the separation of impurities from good pulp.

3.Pressure Control：An accurate pressure control system is maintained inside the equipment to maintain a stable pressure environment. Appropriate pressure helps to promote the flow of pulp and ensure the continuity and stability of the screening process.

The adjustment of pressure can also optimize the screening effect and increase the yield and quality of good pulp based on the characteristics of the pulp and production requirements.

1.Inlet：Located at the bottom of the screen body, it is designed reasonably to ensure that the pulp can enter the screen evenly and stably, avoiding local high or low pressure situations.

2.Screen Drum：It is the core component of screening, usually made of high-strength and corrosion-resistant materials such as stainless steel, with a high-precision screen mesh installed on the surface.

3.Screen Mesh：The material is tough, and the pores are uniform. It can withstand the pressure and wear during the screening process while ensuring the accuracy and efficiency of screening.

4.Outlet for Good Pulp：Located at the upper part of the screen body, it is used to discharge the screened high-quality pulp. Its position and shape are designed to reduce the backflow and disturbance of good pulp.

5.Reject Outlet：Located at the upper part or side of the screen body, it is used to discharge the intercepted impurities. Usually, it is equipped with an adjustment device to control the amount and concentration of rejects.

6.Pressure Control System：Includes pressure sensors, regulating valves, and other components, which can monitor and adjust the pressure inside the equipment in real-time to ensure that the screening process is carried out under the optimal pressure conditions.

1.High Screening Accuracy：It can effectively remove tiny impurities and undesirable fibers, significantly improving the quality of the pulp and providing a guarantee for the production of high-quality paper.

2.Large Processing Capacity：It can handle a large amount of pulp within a unit time, meeting the high-output requirements of the papermaking production line.

3.Stable Operation：Adopting advanced structural design and high-quality material manufacturing, the key components undergo strict testing and optimization, and it can maintain stable performance during long-term continuous operation.

4.Strong Adaptability：It can be flexibly adjusted according to different types, concentrations, and qualities of pulp, adapting to various papermaking processes and production requirements.

5.Energy-Saving and High Efficiency：Through optimized design and pressure control, it can reduce energy consumption and improve production efficiency while ensuring the screening effect.

1.Operation Key Points

Before starting the equipment, the operator must conduct a comprehensive inspection, including the sealing of the equipment, the normality of the pressure system, the integrity of the screen mesh, etc.

Based on the characteristics of the pulp and production requirements, reasonably set parameters such as inlet pressure, flow rate, and reject amount to ensure the equipment operates in the best state.

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

Regularly clean and maintain the equipment to prevent the screen mesh from clogging and impurity accumulation.

2.Maintenance Work

Regularly inspect the wear condition of the screen mesh and replace the damaged screen mesh in a timely manner to ensure the screening accuracy.

Clean the inlet, outlet, and reject outlet to prevent clogging and fouling.

Check the accuracy and stability of the pressure control system and calibrate the pressure sensor and regulating valve regularly.

Inspect and maintain the transmission components, seals, etc. of the equipment to ensure the normal operation and sealing of the equipment.

Establish detailed equipment maintenance records, including maintenance time, maintenance content, replaced components, etc., to track the maintenance history of the equipment and predict maintenance requirements.

1.Improving Paper Quality：Removing fine impurities and undesirable fibers makes the paper surface smoother and more uniform, reduces flaws and defects, and improves the strength, flatness, and print performance of the paper.

2.Protecting Subsequent Equipment：Providing pure pulp reduces the wear and damage to subsequent papermaking equipment, such as paper machines and coaters, and prolongs the service life of the equipment.

3.Optimizing the Production Process：The stable screening effect helps maintain the continuity and stability of the production process and reduces process adjustments and production interruptions caused by pulp quality fluctuations.

4.Reducing Production Costs：Improving the yield and quality of good pulp reduces the waste of raw materials and energy consumption, thereby reducing production costs.

Hot Tags: fine screen up-flow pressure screen, China fine screen up-flow pressure screen suppliers, factory, DD Series Double Disc REfiner, Drump Pulper, SS Frame Of Press Secton, Fiber Grading Sieves, 4800 800 Pope Reel, flotation and deinking equipment