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Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.
Language: English French Polish Portuguese Russian Spanish
Great for trainers or groups who need unlimited online access to multiple courses. Available in two ways:
Headboxes Series (Details)Includes 4 courses for $199/year. Paper Library (Details)Includes 95 courses for $1,499/year.
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Training Time: 27 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian, Spanish
This course covers the purpose and objectives of a headbox on a paper machine, and the advantages of a multi-layer hydraulic headbox. The purpose or function of the major components, and how they all work together to fulfill the objectives of the headbox, is also discussed. Major components described include the stock inlet headers, dilution profiling system, recirculation lines and valves, internal turbulence-inducing elements, slice opening, and various stock jet adjustment mechanisms. Lastly, it includes some protection and care guidelines for the headbox and forming fabrics.
Air-Padded Headboxes
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Fourdrinier Design and Operation
Hydraulic Headboxes - Stock Jet Geometry for Roll Type Gap Formers
Yankee Dryer Design and Construction
Yankee Dryer Safety
The following key questions are answered in this module:
Why are multi-layer headboxes increasingly popular?Because they allow for efficient fiber usage and optimization of desired sheet properties.
Are the stock systems for multi-layer hydraulic headboxes and non-layered headboxes the same?No. Because the different layers can have different furnish compositions, each layer has its own stock preparation and delivery system.
What are the advantages of dilution profiling systems over traditional slice lip adjusters?Dilution profiling systems eliminate the cross-flows in the stock jet and fiber orientation variability that were caused by slice lip adjustments.
What is the purpose of the tubes, chambers, drilled plates, and flat sheets or vanes in hydraulic headboxes?These items induce turbulence in the stock flows to keep the fibers separate and help break up flocs before the stock reaches the forming fabrics.
What happens when the slice opening is widened slightly?The pressure inside the headbox initially drops, so the fan pump speeds up to increase the headbox pressure, which increases the total flow through the headbox. The end effect is a drop in the headbox consistency.
Below is a transcript of the video sample provided for this module:
Perfect for individual users. Get immediate online access. Must be used within 30 days, expires 48 hours after launch.
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