Screening System
Pressure Screening Elements（SCREENING SYSTEM）
The design of the pressure screen should consider the following factors according to different applications:
- Raw materials-type,characteristics,quality
- Finished paper-type,quality
- Good pulp throughput-T/D (L/min)
- Concentration-screening concentration(concentration at inlet and outlet)
- Position and front and rear equipment in the pulping process-rough selection,classification,selection,net flow
- Power requirements
The main application of pressure screen
Old corrugated box board(OCC)
Mixed office waste paper(MOW)
Old newsprint (ONP)
old magazine paper (OMG)coarse
screening,fine screening and grading screening system, paper loss screening system,pre screen flow system,etc
BANNORmechanical pressure screen-high efficiency,energy saving reliable,low loss.
Advantage
- The installation method of the screen frame and the rotorabove greatly reduces the maintenance time and cost.
- The improved shell structure enables the screen frame toobtain stable flow and pressure.
- There is a higher removal rate of stickies.
- The operating efficiency of the paper machine is enhanced toimprove the quality of the paper.
- Reduce energy consumption and reduce extra equipment parts.
- High screening efficiency and low fiber loss
- The integrated equipment has a simple structure and low Investmentcost
- Low maintenance costs
Screening system requirements-high efficiency,
low energy consumption
Sieve out impurities from large to small,easy to dificut first,strong leveling.The application of various technologies such as high concentration,micro-turbulence,low pulse,corrugated sieve plate,new rotor blade,etc.,while improving the fiber yield, strives to maximize the removal of impurities.
In order to meet the long-term stable operation of the pulping system,the screening system needs to have a high ability to remove stickies and minimize fiber loss to reduce costs.
BANNOR Machinery’s pressure screen-high screeningeficiency,low energy consumption,stable operation,and low fiber loss rate.
VCS coarse screen
Main Purpose
Used for coarse screening of various waste paper fibers and the function of removing light impurities and heavy impurities in larger sizes.
Structural features
VCS type pressure coarse screen is an international advanced pulp screening equipment integrating sand removal and screening. It has the characteristics of high screening efficiency,good pulp quality,large production capacity,low energy consumption and long life of screen drum.
- Two types of ladder-type impact-free winding rotor andhorseshoe-shaped rotor ensure high concentration screening.
- The paper sheet in the pulp is flexibly loosened to avoid thecrushing of impurities and the screening efficiency is high.
- Facing high pulp concentration and rotation speed,it has ultra-high stability.
- Heavy impurities are blocked and settled to the bottom to avoidexcessive wear on the rotor and screen drum.
- Larger hole area enables higher productivity.
- The surface of the screen drum is chrome plated,wear-resistant,large throughput,long service life.
- The design of the dilution water at the bottom of the equipmenteffectively prevents clogging and high production capacity.
- Various rotor structures can adapt to different screeningrequirements.
- Simple structure and easy maintenance. （SCREENING SYSTEM）
VFS fractionator screen
Main Purpose
Mainly used for separation of long and short fibers in pulp.The classified long and short fibers can be used to produce different paper varieties.Even in the same variety,only long fiber pulp can be refined after classification,And then mix the long and short fibers to get a higher quality pulp.
The ratio of long and short fibers is determined by factors such as paper type,raw material structure,screen gap specifications, pulp concentration and fluid properties.
The purpose of separating long and short fibers:
- Obtain high-quality pulp from existing raw materials
- Make full use of low-cost fiber raw materials
- Improve paper index
- Get cleaner staple fiber raw materials
- Protect short fibers from excessive damage
- Improve the filtration performance of pulp
- Improve pulp uniformity
Structural features
- There are two types of multi-blade rotor and cyclone rotor,which ensure the
- medium-concentration classification.
- The cyclone rotor adopts a new energy-saving rotor design structure developed by fluid dynamics.The three-dimensional structure of the rotor wings increases the turbulence of the screen chamber and can effectively improve the efficiency of slag discharge,while reducing the concentration problem and making the production capacity higher.
- Reasonable shell distribution design makes the screening area fluid and uniform pulse.The treatment concentration is high,and the fiber classification effect is obvious
- The grading ratio is adjustable and stable.
- The surface of the screen drum is chrome plated,wearresistant,largethroughput,long service life.
The design of the dilution water at the bottom of the equipment effectively prevents clogging and high production capacity.
Various rotor structures can adapt to different screening requirements. Simple structure and easy maintenance.
AWS approach wire screen （SCREENING SYSTEM）
Main Purpose
Used for the screening of pulp in front of paper machine,can effectively evacuate pulp mass,prevent fiber flocculation, thereby improving paper quality.
Structural features
- Low-pulse design reduces disturbance to pulp flow and makes the paper machine pulp more uniform
- Inner-flow design,the rotor rotates on the outside of the screen drum, heavy impurities flow away from the screen drum,the surface of the screen frame wears less,and the service life is extended.
- Inverted cone inner cylinder structure,the flow rate of pulp through the screen slot is constant.
- Optimized rod and rotor blade structure design,large pulp throughput and low energy consumption.
- The surface of the screen drum is chrome plated,wear-resistant,large throughput,long service life.
- High screening efficiency and small tailing.
Advantage
- For efficient screening at the streaming stage.
- The pulse is low,and the streaming system runs more stable.
- Low energy consumption,high operating efficiency,low fiber loss.
- High paper quality and high paper machine operating efficiency.
- The structure is miniaturized and easy to maintain.
Up-flow screen
Main Purpose
It is used in the coarse screen,fractionation on and fine screen in the pulping process.
Structural features
- Upflow design,bottom feeding,heavy slag has been discharged before entering the screening area,reducing the wear of screen drum and rotor,and extending the service life.
- The top structure of the tail slag port is conducive to the rapid discharge of light impurities,avoiding the accumulation of impurities in the shell,reducing the wear of screen drum and rotor,and extending the service life.
- The rapid discharge of light and heavy impurities can avoid the possibility of impurities being damaged and improve the quality of good pulp.
- Open base design for easy maintenance and replacement of belts,pulleys and set bolt.
- The transmission and sealing device can be assembled and unloaded as a whole to reduce the downtime required for maintenance.
- The screen drum and rotor are easy to disassemble, clean,adjust and repair.
- Chrome plated screen drum surface,wear-resistant,large throughput,long service life.
Advantage
- Easy to repair.
- Light impurities and air are quickly discharged from the top tail port.
- High screening efficiency and less mechanical wear-the residence time of impurities in the screen area is short.
- significantly reducing the possibility of impurity circulation.
- Low feed pressure required,reducing operating costs.
- The surface of the screen drum is chrome plated,which is wear-resistant and has low resistance.
- Can be equipped with various types of sieve drums. （SCREENING SYSTEM）
Pressure knotter/Medium concentration screen/Black liquor filter （SCREENING SYSTEM）
Main Purpose
It is used for closed screening in the pulping process of primary pulp.
Structural features
- Closed rotor structure to avoid the entanglement of crude impurities.
- The structure design of the heavy slag collection area can make the heavy slag be discharged in time,avoid passing through the screening area,reduce the wear of the screen drum and rotor,and prolong the service life.
- The design of high-definition washing strength rotor and large ripple angle bar makes the screening concentration higher.
- The design of large turbulence rotor blade and microporous sieve drum makes the fiber extraction in the black liquor more thorough and reduces the influence of high fiber content in the black liquor on the subsequent treatment equipmen.
- The design of closed screening system is beneficial to keep high temperature of pulp,less heat loss of system,and better screening and black liquor extraction effect.
- Medium concentration operation,high equipment capacity,low water and power consumption.
