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Slotted Type Screen Basket
The slotted screen basket is manufactured from SS304 or SS316 stainless steel; it is installed within a pressure screen and operates in conjunction with the pressure screen rotor. Its primary application is in the screening of pulp within pulp and paper production lines. Accept pulp passes through the precisely spaced slots distributed across the pressure screen basket‘s surface, thereby separating and discharging coarser fibers, debris, stickies, and other impurities present in the pulp.What is a Slotted Screen Basket? and its Function
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Product Specifications
There are two types of screen basket: inflow and outflow screen basket. Slotted screen basket utilize high-precision slots to separate fibers and impurities from the pulp. Compared to perforated screen basket, this type of screen basket improves fiber throughput, reduces fiber loss, and significantly enhances screening accuracy. Our own coating equipment has a hardness of HV850-1100 degrees and a thickness of up to 0.3mm; Inflow pressure screen is widely used due to its special screening mechanism. Inflow pressure screen is a combination of suction and external pressure, with external pressure being more commonly used. Due to the rotor being outside, heavier impurities are pushed in the opposite direction of the screen basket during rotation, resulting in lower wear on the drum and better pulp quality. Therefore, the inflow slotted screen basket is mostly used for fine screening or pre-net screening.Pressure Screen Basket Type
Outflow pressure screen is used for coarse screening, fine screening, and pre-net screening.
The form of the screen basket is divided into hole type and slotted type, with hole type divided into ordinary type and vertebral hole type, and slot type divided into milling slotted and bar slotted. The sieve slot can be as small as 0.05mm.
The screen basket uses different forms of mechanisms depending on its purpose, with high screening efficiency and low power consumption.Advantages of Slotted Screen Basket
Outflow Slotted Screen Basket
More than forty different forms of bars are designed according to user needs, with the narrowest slot reaching 2.0mm and the widest reaching 4mm, suitable for longer fiber screening.
Inflow Slotted Screen Basket
Mill Slotted Screen Basket
The mill slotted screen basket is similar to traditional pressure screen basket, is machined using a precision CNC milling machine. It features a robust overall structure, low porosity, and is not easily deformed. Suitable for processing waste paper pulp and high-concentration pulp, etc.
Other Type Slot Screen Basket
Slotted Screen Basket with Turbulence Bar
Outflow Screen Cylinder
Slotted Screen Basket with Dilution Water Ring
Slotted Screen Basket with Sleeve
Combination Screen Basket
Multi Stage Screen Basket
Production and Finishing of Pressure Screen Basket
Slotted Screen Basket FAQS
How to Determine if the Slots in a Slotted Screen Basket Are Worn?
You can directly and intuitively observe the slot of the slotted screen basket after the machine stops. Check whether there are scratches, pits, widening or deformation on the surface. In particular, check whether the edge of the screen slot is irregular or rough. If the above phenomenon occurs, it is very likely that the pressure screen basket has been worn.
Based on the screening results, if a significant increase in impurities (exceeding the normal range) is observed in the screened slurry, or if screening efficiency declines markedly (manifested as a reduction in the volume of slurry processed within a given timeframe), it indicates that the slots of the slotted screen basket have worn down and are no longer capable of effective filtration and separation.
Compare production-related data and record production data (output, quality of good pulp, amount of tail pulp, etc.) before and after the use of the pressure screen basket regularly. If abnormal data occurs, especially if the quality of good pulp deteriorates or the amount of tail pulp increases when the output is stable, the possibility of screen slot wear needs to be considered.
The width of the screen gap can be detected by measuring tools. Use a special measuring tool (caliper) to check the width of the screen gap. If it exceeds the design standard of the screen drum, it indicates that the screen gap has been worn.
Pay attention to the sound when the equipment is running. Under normal circumstances, the pressure screen basket is running. If the screen slot is worn, the slurry may flow abnormally inside, with slight noise or vibration.
Repair of Slotted Screen Basket After Wear
The common repair methods for pressure screen baskets following wear are as follows:
(1) Laser Cladding Repair: By utilizing a high-energy-density laser beam to clad alloy powder with specific properties onto the worn area, this process creates a cladding layer characterized by high bonding strength with the substrate and a fine-grained microstructure, thereby restoring the dimensions and performance of the screen basket slot.
(2) Overlay welding repair: Manual electric arc welding or gas shielded welding is performed on the worn parts of the pressure screen basket. Wear-resistant welding materials (high chromium cast iron, tungsten carbide, etc.) are selected to increase the wear resistance of the screen slot. However, significant deformation may occur during the hardfacing process, necessitating subsequent machining and finishing.
(3) Brush Plating Repair: Under the influence of an electric field, metal ions from a plating solution are deposited onto the worn surface of the screen basket slot. This method allows for effective control over the thickness and uniformity of the plating layer, making it suitable for small-area, localized repairs.
(4) Thermal Spray Repair: Techniques such as plasma spraying or flame spraying are employed to deposit wear-resistant materials onto the surface of the screen basket slots, thereby forming a protective coating. However, the bonding strength between this coating and the substrate is relatively low, which may lead to peeling during operation.
It is important to note that when repairing a pressure screen basket, the appropriate repair method must be selected based on various factors, including the drum’s base material, the extent of wear, and operational requirements. This ensures that, following the repair, the dimensional precision of the screen slots and the surface quality meet functional demands. Furthermore, the repaired pressure screen basket must undergo rigorous inspection and calibration to guarantee its proper operation and effective screening performance.
How Long Can a Slotted Screen Basket Be Used after Repair?
Once the slots of a pressure screen basket have been repaired, its subsequent service life is influenced by a multitude of factors; therefore, it is impossible to provide a precise, fixed timeframe.
If the repair process is excellent, the repair materials are of good quality, and the screen basket is used and maintained properly after repair, its service life can be extended by several months or even a year (using high-quality wear-resistant materials for laser cladding repair, and maintaining suitable working conditions and regular inspection and maintenance can extend its service life by about one year). Conversely, if the repair process and materials are average, or if the repaired pressure screen basket is still in a harsh working environment, its service life will be relatively short, about a few months.
The material and wear condition of the pressure screen drum itself, as well as the properties of the materials being processed and the intensity of the work, will all affect the service life after repair. (For instance, when processing highly abrasive or strongly corrosive slurries, even if the screen basket undergoes an exceptionally high-quality repair, the extent to which its service life can be extended remains relatively limited.)
How to Maintain Optimal Operating Conditions for a Slotted Screen Basket After Wear Repair?
After a slotted screen basket has undergone wear repair, the following measures can be adopted to ensure it maintains optimal operating conditions:
Control the feeding speed and flow rate; the feeding speed must not be excessive, and the flow rate should be maintained at a relatively stable level to prevent a sudden surge of material from impacting the
pressure screen basket within a short period, thereby avoiding additional damage.
Secondly, pay close attention to the characteristics of the incoming material. Minimize the introduction of large particles, sharp-edged objects, or high-hardness materials whenever possible. Implement pre-screening and processing of the feed to remove any impurities that could cause abrasion to the pressure screen basket.
Ensure the equipment operates at its normal designated speed. Avoid frequent starts and stops, as well as over-speed operation; maintaining a stable rotational speed helps to minimize mechanical wear on the pressure screen basket.
Additionally, it is essential to monitor and control the operating temperature. Excessively high temperatures can compromise the material properties of the screen basket; therefore, ensure that operation remains strictly within the temperature range the drum is designed to withstand.
At the same time, prioritize equipment maintenance and cleaning. Promptly remove residual debris from the surface and slots of the
pressure screen basket to prevent accumulation and subsequent hardening, which could further exacerbate wear.
Finally, pay attention to the lubrication and sealing of the equipment. Good lubrication can reduce friction between parts, while seals can effectively prevent dust and impurities from entering the interior.
Install appropriate protective devices. For example, a buffer device can be installed at the feed inlet to reduce the direct impact of the material on the pressure screen basket.
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