Drainage Structures

 

 

Forming Board Assemblies

Forming Board Assemblies are critical to create the proper balance between early drainage of the fourdrinier and activity management. Kadant custom designs each assembly for the proper open area and blade spacing for your grade and speed.

Gravity Foils

Gravity Foil Assemblies are critical on fourdriniers to create activity pulses and begin early drainage on the table. The magnitude of the pulses is determined by machine speed, stock consistency, blade angle, width, and spacing.

VID™ Forming Technology

VID Forming Technology is applicable for paper grades from linerboard to fine papers to fluff pulp. Papermakers are able to control activity and optimize fourdrinier drainage performance while improving important sheet characteristics.

 

Stepfoils

Stepfoil and low vacuum boxes can be applied effectively on all paper grades. Sheet consolidation with minimal sheet disruption is critical while minimizing drag load and optimizing retention.

Flat Boxes

Forming fabric design and the high vacuum system determine the sheet dryness delivered to the couch roll. Kadant AES will optimize the number of high vacuum compartments, number and width of slots, and recommend vacuum levels to minimize drag load and maximize dewatering.

Activity Blades

On many machines and grades, it is often necessary to provide additional activity in the forming zone to create a more homogenous sheet of paper.  Posi-Pulse™ and Double Posi-Pulse blades deliver a shear force to break up the fiber mat and allow succeeding drainage elements to work more effectively.