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Language: English French Polish Portuguese Russian
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Paper Machine Dryers Series (Details)Includes 8 courses for $299/year. Paper Library (Details)Includes 92 courses for $1,499/year.
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Training Time: 42 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
On conventional paper and board machines, the energy required to dry the sheet to the desired moisture target at the reel is supplied by a series of rotating, steam-heated, dryer cylinders. These cylinders, or "cans," are grouped into multiple drive sections, which go progressively faster in order to adjust for machine direction stretch and to maintain sheet tension. This module will provide a general overview of the drying section of a paper machine.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What is the purpose of dryer fabrics on multi-cylinder machines?Dryer fabrics improve heat transfer and help control cross-machine direction shrinkage and sheet distortions by holding the sheet tightly against the can surfaces. They also drive dryer cans on some machines.
What is the purpose of dryer hoods?Originally, hoods were used to improve machine room conditions. They have evolved and their current purpose is to improve control of air flows, temperatures, and humidites around the sheet as it dries.
What are single-tiered dryer sections?Single-tiered dryer sections have one level of heated dryer cans, plus one level of rolls. They typically utilize a serpentine-shaped "unirun" fabric that supports the sheet through the entire section.
Why are single-tiered dryer sections often followed by double-tiered sections?Because only one side of the sheet contacts the dryers in single-tiered sections, they are often followed by double-tiered sections to make the two sides of the sheet more equal in appearance.
What is the purpose of pocket ventilation systems?Pocket ventilation, or PV, systems introduce hot dry air across the machine in dryer pockets to keep the air around the sheet from becoming saturated and improve drying. This helps ensure a flat moisture profile at the reel by maintaining uniform humidities across the machine.
Below is a transcript of the video sample provided for this module:
Dryer Felt Design
View Course
Dryer Felt System Operations
Fourdrinier Design and Operation
Paper Machine Dryer Hood Air Systems
Yankee Dryer Design and Construction
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