Fourdrinier Design and Operation

SKU: C-638Duration: 23 Minutes

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Course Details

Specs

Training Time: 23 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, Polish
 Multiple languages available for USB and Enterprise (SCORM/AICC) formats. Contact us for more info.

A Fourdrinier is a type of forming section or former on a paper or board machine. It serves three main functions: to drain and recover white water from the stock suspension to form a sheet, to deliver the formed sheet to the press section at the highest possible consistency, and to optimize sheet formation to create a strong, uniform, high quality sheet of paper or board. Knowing the design and principles of the Fourdrinier is essential to proper sheet formation.

Learning Objectives

At the end of this module, you will be able to:

  • Identify safety and wire protection guidelines for the Fourdrinier
  • Describe the three main functions of the Fourdrinier in the paper or board making process
  • Identify and describe the three zones on a Fourdrinier
  • Identify and describe the functions of the major Fourdrinier components

Key Questions

The following key questions are answered in this module:

What exactly is a Fourdrinier ""wire""?
Contemporary wires are fabric loops that are woven from polyester monofilaments, and traditional textile variables (weave pattern, yarn count, and yarn diameter) allow them to be customized to each machine and grade mix

Why are different devices used on a Fourdrinier to remove water from the sheet?
Vacuum levels increase on the Fourdrinier table because water becomes increasingly difficult to remove from the sheet. Foil boxes help remove water early on, and flatboxes with slotted covers are used later because they provide better sheet support at higher vacuum levels.

Why must Fourdrinier wires be stretched or tensioned?
Constant tension on the wire allows the wire to maintain its retention and drainage characteristics as it ages and stretches. Tension is also required to properly drive the wire.

How do guide rolls work?
Guide rolls work on the principle that when a wire contacts a roll, it will ""steer"" toward the end of the roll that it contacts first.

What is the purpose of the separators on the drive side of a Fourdrinier?
The air-water mixture pulled from the sheet into each vacuum box is pulled first into a separator, which separates the air from the water. The air flows out the top to the vacuum source, and the water exits from the bottom to a seal pot or tank.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Deckles are typically installed on both sides of the headbox to prevent the stock from running off the wire edges and help establish the sheet edges. Waves or wicks created by the deckles can cause non-uniformity in the sheet edges. Water jet deckles or downstream edge curlers can help minimize or even out deckles wicks. On early paper machines, table rolls were used in the initial drainage zone initially as wire support. And it was thought that water was removed by gravity alone. However, as speeds increased, it was found that a vacuum pulse was being created at the outgoing nip, accompanied by a pressure pulse at the angling nip. As speeds increased further, these pulses intensified and began to negatively affect sheet formation and retention.

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