DSM Screen

DSM Screen
DSM Screen

5° screen – Thickening and screening.
120° screen – Pulp thickening, recovery, and separation of fibers.
800 mm arc length – Media recovery. Use at height limit.
1600 mm arc length – Made for maximum drainage.
1200 mm arc length – Maximum drainage, but the height does not allow 1600 mm.

Wedge wire DSM screen also has a name: sieve bend screen. Commonly available types of DSM screens are 45°, 60°, 120°, 270°, and 300°.
The raw materials of sieve bend screens are wedge wire panel screens of different specifications and sizes. Then bend it in a certain arc. This production process also includes welding and laser cutting processes. The reason why a wedge wire screen was chosen as the raw material is that this material has a continuous grooved structure. Moreover, the pores have a special V-shaped wire structure, which is not easy to block and easy to clean. It also has efficient filtration performance.
In addition, a reasonable degree of bending is particularly important. When the material flows through the curved surface, it will be affected by traction force and cutting force at the same time. According to a large number of terminal tests, it is confirmed that curved screens have higher filtration efficiency than flat screens.

The quality of the DSM screen directly affects the working efficiency of the entire screening system. We have added special production processes. For example, it is highly polished and its working surface is round and smooth, and profile wire has a sharp edge and extremely high wear resistance.

Features of DSM screen 

MaterialSS304, SS304L, SS316, SS316L, SS321, Duplex, Hastelloy, etc.
Length rangeUp to 6000mm.
Width rangeUp to 6000mm.
Slot size20 microns to 3000 microns (tolerance: +-5 microns).
Profile wire0.5×1.50.75×1.51×21.5×2.52×32×43×5
Support rod1.5×2.51.5×2.51.5×2.52×33×53×53×5
Angle90°, 120°, 140°, 150°, 160°, etc.
Arc height10mm, 15mm, 20mm, 50mm or depending on your screen panel size.
FrameFrameless or “L” type frame, ordinary frame, 5*10mm frame, etc.
  • Lateral strength. As the width of the profile grows, the lateral strength increases rapidly.
  • Vertical strength. The depth of the contour increases rapidly. 
  • Better filtration performance. We have developed a special manufacturing process with gap sizes as small as 20 microns. Proper filtration accuracy can reduce pump maintenance and extend the service life of the equipment.
  • long lasting. As the working time of the filter material increases, the pore wear will become more and more serious. Therefore, the filtering precision becomes larger and the filtering effect is lost. Wedge wire DSM screen has high welding strength, is not easily deformed, and has strong mechanical properties.
  • Not easy to clog. The gap of the wedge wire sieve bend screen has a special “narrow inside and wide outside” structure. The contact area with particle impurities is small, and then backwashing with high-pressure water guns is performed.

DSM Screen For Paper Industry

  • White water fiber recycling.  
  • Slurry concentration process. 
  • Purification of spray water and sealing water. 
  • Long and short fiber classification.
  • Fiber/filler separation. 
  • White water filtration, sewage treatment, etc. 
ModelCapacityScreen WidthRAngleSlot size
BLUHS0140-807002030450.3-1
BLUHS0260-120100045
BLUHS0390-180130045
BLUHS04120-220160045
BLUHS05160-300190045
BLUHS06200-360220045
BLUHS0740-8070060
BLUHS0860-120100060
BLUHS0990-180130060
BLUHS10120-120160060
BLUHS11160-300190060
BLUHS12200-360220060
BLUHS13220-400240060

Working principle:Under a certain pressure, the pulp first enters the pulp lip through the top pulp inlet of the DSM screen. After the conveying speed of the slurry increases, it enters the arc-shaped filtering area along the tangential direction. In this area, centrifugal force occurs, causing the slurry to dehydrate repeatedly. Then it enters the pulp outlet under the action of gravity and the discharge equipment goes out.
In the pulp concentration washing and papermaking wastewater fiber recovery processes, the DSM screen system is very efficient. It has the advantages of simple structure, small floor space, large processing capacity, and almost no power consumption.

Sieve Bend Screen for Starch Production

In starch production, sieve bend screens mainly appear in the separation process of starch, germ, and fiber. The entire DSM screen system has no rotating parts except the slurry pump. Therefore, a sieve bend screen has great advantages over other types of screening equipment in terms of operation and maintenance.
To ensure separation and washing quality, multiple DSM screen devices are often used to work together. To improve the working efficiency of DSM screen equipment. We changed the welding angle of the profile wire and support rod. In other words, there is an inclination angle between them. This process gives it special cutting and separation capabilities. At the same time, the sieve bend screen also has strong self-cleaning ability.

Working principle

The working pressure of the sieve bend screen is 0.25-0.4MPa. The feed pump provides sufficient pressure to the suspension.

  • Under certain pressure and appropriate injection speed, the suspension flows through the filter screen at high speed.
  • Then spread out quickly and evenly cover the entire DSM screen width.
  • And quickly flows through the screen surface, and the flow direction of the suspension is at right angles to the screen gap.
  • The filter screen exerts three forces on the suspension. They are centrifugal force, impact force, and gravity. The profile wire is like a sharp knife, continuously cutting the suspension emulsion.
  • The suspension is scraped into a thin liquid layer. The fine particles and liquid layer will enter the bottom layer through the screen gaps and become undersized. Part of the liquid layer and coarse particles flow through the filter screen and become the supernatant.
  • The principle of screening mainly uses the different particle sizes of various substances in the suspension to perform fractionation with the help of centrifugal force.

Applications in Coal Mining

In the coal preparation plant and mineral processing plant, the materials are pre-dehydrated, deslimed, demediumized, and the classified slime is recovered. The most common bending angles: 45 degrees and 60 degrees.

ModelSize
AA1BB1HH1
BLUHSB0148938470085527600
BLUHSB024893841000115527600
BLUHSB034893841300145527600
BLUHSB044893841600175527600
BLUHSB054893841900205527600
BLUHSB064893842200235527600
BLUHSB076664927008552905173
BLUHSB0866649210011552905173
BLUHSB09666492130014552905173
BLUHSB10666492160017552905173
BLUHSB11666492190020552905173
BLUHSB12666492200023552905173
BLUHSB13666492220025552905173

In addition, sieve bend screen also has the following applications.  

  • Water treatment industry. In water treatment, there is a device that does not require any energy to drive. The screening process can be carried out solely by the gravity of the material. Its name is the parabolic screen filter. The core accessory of this equipment is the DSM screen.
  • Mining industry: Sieve bend screens can participate in the tailings treatment process of various mining industries, such as gold mines, copper mines, iron ores, etc. 
  • Coal preparation industry: It can improve the quality and production of coal. 
  • Chemical industry: The dehydration process in the chemical industry requires the use of a large amount of chemicals. The DSM screen screening system can reduce the consumption of chemicals, so it has good application prospects.