Under-Machine Repulpers

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.

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Course Details

Learning Objectives

• Describe the purpose of under-machine repulpers • List the safety hazards and safety guidelines associated with under-machine repulpers • List the components of a typical under-machine repulper • List typical locations for under-machine repulpers • Describe the typical flows into a couch pit, press pit, reel repulper, and winder repulper

Specs

Course Level Intermediate
Languages English, French, Russian
Compatibility Audio, Video
Based on: Industry Standards and Best Practices

Author

Vector Solutions

With over two decades of experience designing advanced 3D animated courseware and developing our proprietary learning management software, we pride ourselves by having developed over 1,000 safety and operations training modules, which have helped train over 250,000 workers worldwide. Our highly experienced team provides the industry with a simple and high-quality means of training their workforce. Whether your team consists of 25 people or an enterprise with thousands, we’re here to help.

Key Questions

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

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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