OCC - Pulping

SKU: C-770Duration: 28 Minutes Certificate Included

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Course Details

Specs

Training Time: 28 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

OCC plants convert recycled old corrugated containers into pulp that can be used on paper and board machines to make valuable pulp and paper products. This course describes the "repulping" process which converts unpacked OCC bales into a pulp slurry using a repulper.

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

  • Describe the purpose of repulpers in OCC plants
  • List safety hazards and safety guidelines associated with repulpers
  • List the process steps for OCC repulping
  • Identify and describe major components of repulpers
  • Identify and describe primary process flows

The following key questions are answered in this module:

What are the components of a repulper?
A typical OCC repulper consists of a vat, a rotor, an extraction plate, pumps, a junk trap and a ragger.

What range of pulp consistency is used in repulpers?
There are different repulper types. Low consistency repulpers operate at consistencies below 6%, medium consistency is 6-12%, and high consistency repulpers operate from 12-19%.

What is the difference between batch and continuous repulpers?
In batch repulpers, the addition of OCC and water, slushing, diluting, and dumping are completed in a series of steps. Because continuous repulpers operate continuously they have a higher capacity because they don't need to stop to fill or dump.

What is the purpose of the rotor?
A repulper rotor has two major purposes: to agitate the fiber-water slurry, and to keep the extraction plate mounted under the rotor clear.

What is the purpose of a junk trap or ragger?
The junk trap and ragger remove large contaminants from the repulper vat and protect downstream equipment from damage and wear.

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

A typical OCC repulper consists of a vat, rotor inside the vat, one or more pumps each with an extraction plate, a junk trap, and a ragger. The OCC bales are typically fed into the repulper vat by a conveyor system along with a measured amount of dilution water. The rotor positioned at the bottom or side of the vat is used to break up the OCC into separate fibers suspended in the water. The ragger and junk trap are used to collect and remove large contaminants from the top and bottom of the vat respectively, and the extraction plates are used to screen the slushed pulp as it exits the vat in order to protect downstream equipment. The OCC pulp is then pumped to the next process step.

Use the additional resources and links below to learn more about this topic:

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