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Language: English French Portuguese
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Kraft Pulping Series (Details)Includes 12 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 18 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French
In the kraft chemical pulping process, wood chips are "cooked" in a mixture of alkaline chemicals in large pressure vessels called digesters. Due to irregularities in the wood, and contaminants in the incoming wood, not all of the material coming from the digester is suitable for papermaking. Brown stock screening is that part of the pulping process where oversized and contaminant particles are separated from good papermaking fibers. Pulp exiting a kraft digester is known as brown stock. Unwanted material, or debris, is generally removed in two steps, deknotting and screening.
Batch Cooking Introduction
View Course
Brown Stock System Basics
Brown Stock Washing
Continuous Cooking Introduction
Recaust Liquor Testing
The following key questions are answered in this module:
What is the purpose of brown stock screening?The purpose of brown stock screening is to pass as many flexible usable fibers through to downstream processes while removing oversize contaminants.
What is the advantage of having a secondary knotter?A secondary knotter processes rejects from a primary knotter and increases overall screening yield by recovering usable fiber.
What is the role of dilution water in a pressure screen?Dilution water added to the lower part of a screen helps maintain good separation of fiber within the screen.
What is one way that pressure screens are kept from plugging?Most cylindrical screens have a rotor which moves relative to the basket and creates pressure pulses.
What is a cascaded screening system?A cascaded screening system is one in which the rejects of one stage of screens are re-screened in order to increase the overall screening yield.
Below is a transcript of the video sample provided for this module:
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