Under-Machine Repulpers

SKU: C-754Duration: 12 Minutes

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Course Details


Training Time: 12 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, French, Russian

Most paper and board machines are equipped with at least three under-machine repulpers. These repulpers collect and process wet and dry broke from the machine during normal operation and also during startups and sheet breaks. The three most common under-machine repulpers are located under the couch roll, press section, and reel. Some machines have another repulper located under the winder. This modules describes the purpose, locations, and components of under-machine repulpers.

Learning Objectives

  • Purpose of under-machine repulpers
  • Safety hazards and safety guidelines
  • Couch Pits
  • Press Pits
  • Reel / Dry End Repulpers
  • Repulping process
  • Winder Repulpers
  • Typical components
  • Process flows

Key Questions

The following key questions are answered in this module:

What is the purpose of under-machine repulpers?
To process the broke generated during the production of paper or board so that the fibers and other valuable components of the sheet can be reused

Where are under-machine repulpers normally located?
Under the couch roll at the end of the forming section, under the press section, under the reel, and sometimes under other major machine sections and/or the winder

What are the typical components of an under-machine repulper?
A vat, showers, one or more agitators, and one or more pumps

What type of broke is collected in a couch pit?
Wet edge trim during normal production, and the full sheet during startups and sheet breaks

What is the purpose of the ventilation/exhaust system on a reel repulper?
To create a partial vacuum in the broke chute

Sample Video Transcript

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

Some dry end and winder repulpers are equipped with broke conveyors to direct broke from the basement into the vat. And some have guillotines used to cut down on salable rows into slabs that can be repulped. Under Machine Repuplers dilute and disintegrate the wet or dry broke from the machine and then pump the resulting broke pulp to the broke system which makes it available for reuse. Some facilities thicken the broke pulp before it goes to the broke system. Repulpers Controls are available to start and stop the agitators and pumps as well as control vat levels, broke pulp consistencies and shower flows. Repulper and broken conveyor emergency stop or E stop buttons are typically located at the repulpler and also on the operating level.
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