Supplemental and Recycled Fiber - Fiber Deinking

SKU: C-685Duration: 17 Minutes

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Language:  English

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Supplemental and Recycled Fiber Series (Details)
Includes 13 courses for $499/year.

Pulping Library (Details)
Includes 72 courses for $1,499/year.

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Course Details


Training Time: 17 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Wood fiber accounts for more than 90% of the raw material used in the production of paper and board products, and it can come from a variety of sources. These sources can be slushed virgin fiber that is produced onsite, market pulp from other pulp mills, or recycled/secondary fiber. Recycled paper can be broken into several categories including old corrugated containers, mixed paper, and deinking grades. Most deinking grades consist of old newspapers, old magazines and office waste. This course will focus on the equipment and processes used for deinking.

Learning Objectives

  • The purpose of deinking
  • The role of repulping, flotation, washing, dispersing, and bleaching in deinking
  • How surfactants are used for deinking
  • How flotation deinking works
  • The process and typical equipment for flotation deinking
  • How pulp is deinked by washing
  • The process and typical equipment for dispersing
  • The process and typical equipment for deinked pulp bleaching
  • Safety hazards and guidelines associated with recycled fiber deinking

Key Questions

The following key questions are answered in this module:

What is deinking?
Deinking is the process of removing ink and stickies from recycled pulp. Deinked pulp grades include old newspapers, old magazines, and office waste.

How is ink removed from the paper?
There are several steps. Repulping breaks up the paper and detaches the ink from the fibers. Ink is separated by flotation or washing with the aid of surfactant chemicals.

What are surfactants?
Surfactants are soap-like chemicals that have both hydrophilic and hydrophobic components. Surfactants are used to disperse or collect ink particles.

How does flotation separate the ink?
Surfactants help Ink particles attach to tiny air bubbles that are injected into low consistency pulp. The bubbles rise to the top of a flotation cell and create a layer of foam. The ink-containing foam is removed from the top and the clean deinked pulp is removed from the bottom of the cell.

What is dispersion?
Not all of the ink particles are removed by washing or flotation. Dispersion is a process to disintegrate the remaining ink particles and disperse them in the pulp so they are no longer visible.

Sample Video Transcript

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

Once ink particles have been detached from the fibers, they can be removed by flotation. Small air bubbles are injected into low consistency pulp, and the mixture is added to a specially designed tank called a flotation cell. With the aid of surfactants, the ink particles attach to the air bubbles, as the bubbles rise to the surface. A layer of foam forms on the surface of the suspension and is removed as rejects. Water is removed from the rejects before they are disposed of.
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