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Language: English Portuguese
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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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Training Time: 12 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
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. After repulping, the OCC pulp contains some contaminants, such as staples, glass debris, and sand, as well as fiber flakes and bundles that were not separated into individual fibers during repulping. To remove these undesirable materials, the pulp slurry goes through one or more screening processes to remove the contaminants that are larger than fibers. This course describes the initial, "coarse screening" process used to remove the largest contaminants from the OCC pulp.
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The following key questions are answered in this module:
What is the goal of coarse screening in an OCC facility?Coarse screening is one of the first separation processes in a recycled fiber facility and its purpose is to remove contaminants that are significantly larger than the fibers.
What is the purpose of the rotor in a cylindrical screen?Shaped elements on a spinning rotor in a cylindrical screen create pressure pulses which assist with fiber flow through the screen and help prevent screen plugging.
What process variables can be used to determine if a screen is plugged?If the pressure differential between the inlet to the screen and the screen accepts stream increases, there is a good chance that the screen is plugging.
What is the primary advantage a disk screen offers over a cylindrical screen?The rotor in a disk screen is effective at breaking up fiber bundles which would otherwise be rejected.
Why do some screening systems use multiple stages of screening?Multiple stages of screening permit the reprocessing of rejects which increases the overall retention of acceptable fiber.
Below is a transcript of the video sample provided for this module:
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