CellecoScreen, Type-T- Multi-functional Coarse Screening
Key Benefits
- • Low System & Unit Energy Requirements
• Simplified Coarse Screening System
• High Removal Efficiency
• High Consistency Capabilities
• Space Saving Access
Energy requirements for the TYPE T System are greatly reduced due to the innovative methods that combine the HD cleaner and coarse screen functions. In many applications, pulper accepts can be fed directly to the TYPE T screen.
Simplified Coarse Screening System
Compared to conventional coarse screening systems Celleco's approach to secondary fiber uses fewer components and less power. Less energy applied to the pulp maintains fiber characteristics and contaminant size for easier removal.
The TYPE T screening action does not create "fines". Therefore, freeness is retained in the screen. This means that the accepts stream contains more long fiber, giving better dewatering properties and stronger pulp.
Many benefits for refining can be realized with this type of screening technology.
High density cleaners can be eliminated due to the heavy weight removal in the feed zone of the screen. Mild deflaking can be accomplished using the deflaker bars on the feed into the screen, thus eliminating the need for a deflaker.
High Removal Efficiencies
The CellecoScreen, TYPE T, is capable of attaining very high removal efficiencies of various types of debris. The feed zone has been designed to remove gross debris ahead of the screening zone. By retaining the pulp in the extended feed zone, the heavy contaminants such as rocks, glass, and tramp metal, as well as staples are removed ahead of the screening zone. This greatly increases the life of the moving parts in the screening zone. The CellecoScreen, TYPE T, is fitted with deflaking bars on the face of the rotor, which allows for a gentle deflaking when following a drum pulper, a high consistency pulper, or a low consistency pulper with low retention time. The deflaking action of the screen greatly increases the capacity of the unit since the deflaked stock is accepted by the screen.
Moving on to the screening zone, many of the benefits offered by the CellecoScreen arise from an innovative perspective on the interactions between the rotor and the screen basket.
The CellecoScreen's key innovation in this area is the patented "Riflewave" pattern in the screen basket. The angling of the slot arrangement accelerates the axial motion of contaminants along the length of the screen and therefore facilitates the separation process in the screening zone which makes screening much more efficient.
Reduced System Fiber Losses
Because of the deflaking in the CellecoScreen, TYPE T, less good fibers are lost. Less paper flakes from the pulper will be rejected. The production of fines will be much lower. Less equipment and fewer pumping stages will work the pulp, which results in less fiber loss.
Space-saving Access
In terms of operating flexibility, a space-saving feature of the CellecoScreen concerns the removal of the rotor and bearing assembly. These are removed out of the front of the screen for maintenance and repair. This saves space because conventionally in screens it has been necessary to also open the back to remove parts. This "front only" design innovation means that the CellecoScreen doesn't need a lot of access space behind it. It can, for example, be located with its back very close to a blind wall.
GL&V Pulp and Paper Group, 1000 Laval Blvd., Lawrenceville, GA 30043. Tel: 770 963-2100; Fax: 770 822-2164.