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Language: English French Polish Portuguese Russian
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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: 16 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
A hydraulic headbox is designed to deliver a uniform, low consistency stock stream to the Fourdrinier wire. It is important to monitor the geometry of the stock jet because it greatly impacts the appearance and performance of the sheet. Only by understanding the variables that affect the stock jet, and how the jet geometry affects sheet properties, can one begin to make adjustments to the headbox to optimize sheet quality.
Air-Padded Headboxes
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Fourdrinier Design and Operation
Hydraulic Headboxes - Multi-Layer Headboxes
Hydraulic Headboxes - Stock Jet Geometry for Roll Type Gap Formers
Multi-ply Forming
The following key questions are answered in this module:
What is the jet impingement angle?On a Fourdrinier machine, it is the angle between the stock jet and the wire as the jet strikes the wire
Why is the stock jet geometry so important?Stock jet geometry is important because it affects sheet formation, and sheet formation affects both the appearance and the performance of the sheet
What is the difference between "pressure forming" and "velocity forming"?Pressure forming occurs with very high jet angles, where the stock jet is forced down into the wire. Velocity forming occurs with low jet angles, and the stock jet lands more gently on the wire.
What is the "jet-to-wire ratio"?It is the ratio of the stock jet speed and the wire speed, and it greatly affects the orientation of the fibers in the sheet
What is the "L/b ratio" and why is it important?It is the ratio of the horizontal spacing to the vertical spacing between the slice lip and apron lip. It is important because it affects the jet landing point and the jet impingement angle.
Below is a transcript of the video sample provided for this module:
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