CENTERDISC CDI Disc Filter

The CENTERDISC CDI disc filter is primarily designed for fiber recovery from white water and broke thickening of medium to large flows. The CENTERDISC CDI is insensitive to concentration and freeness variations and suites most pulp and paper grades.

Key Benefits

• Ability to handle high freeness applications
• Ability to handle high feed consistencies
• Ability to handle large flows
• User-friendly operation
• Open grid segment

Ability to handle high freeness and high consistency applications
The CENTERDISC CDI filter's ability to handle high freeness and high consistency grades makes it flexible to process variations, and allows the surrounding process equipment to be smaller. Such ability is derived from the unique open rotor design.

Segments are mounted onto cross channels connected to axial channels. The discharge trough is placed in the center of the filter. The design allows the thick, high freeness pulp fiber mat to fall directly into the discharge vat. The agitating effect of the cross channels makes the CENTERDISC CDI filter ideal for high freeness pulp as the mixture will not sediment.

In addition, the CENTERDISC CDI filter produces consistent pulp quality in an efficient process with variations in input. Other benefits derived from the open rotor design are high capacity, minimum space requirements, low maintenance costs and operational reliability.

Ability to handle large flows
The unique rotor design also enables the CENTERDISC CDI to handle, for disc filters, extreme high flows. This feature makes it possible to use disc filters in applications where traditionally only drum deckers have been used.

Simple operation and maintenance
The CENTERDISC CDI filter is designed with both the operator and the mechanic in mind. Filter segments, sealings and bearings are easily accessible from outside the filter. Standard components are used for drives and bearings.

Easy cleaning of segments
The open grid segment design with over 90% open area eliminates the risk of pulp and debris accumulating inside the sector. This design allows the fabric to be cleaned from both the outside and inside by a spray water jet through the open sector. This keeps the cloth cleaned longer which improves effectiveness.

Working principle
The feed suspension enters the filter vat via the full length headbox and is uniformly distributed. The pulp mat starts to form under gravity, ensuring optimal dewatering characteristics. The filtrate is drained via the open-grid sectors and the cross channels to the corresponding axial channels. The axial channels are connected to a spider formed by inclined channels. The spider is connected to a suction box with a valve for setting the split between cloudy, clear filtrate and super clear filtrate.

GL&V Pulp and Paper Group, 1000 Laval Blvd., Lawrenceville, GA 30043. Tel: 770 963-2100; Fax: 770 822-2164.