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Language: English French Polish Portuguese Russian
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Paper Machine Auxiliary Systems Series (Details)Includes 8 courses for $299/year. Paper Library (Details)Includes 92 courses for $1,499/year.
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Training Time: 23 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
Vacuum systems on paper and board machines dewater the stock as the sheet forms, dewater and clean the press felts, which, in turn, remove water from the sheet, and helps transfer the sheet between sections of the machine. This module describes the main functions of vacuum systems on paper and board machines, the safety hazards and safety guidelines associated with vacuum systems, and the equipment that can be used to produce vacuum.
At the end of this module, you will be able to:
The following key questions are answered in this module:
How is vacuum used in the forming section of a paper or board machine?In the forming section, vacuum is used at vacuum foil boxes and flat boxes to remove water from the stock
Why are vacuum levels usually stair-stepped (gradually increased) in the forming section?Vacuum is increased because the water becomes harder and harder to remove as the sheet forms, and also to prevent the sheet from sealing early on, which makes it harder to remove the remaining water
Where is vacuum used in the press section of a paper or board machine?In uhle boxes to remove water and debris from the press felts, and in suction rolls for multiple reasons, including sheet transfer, pulling in steam, and preventing sheet flutter
What devices are used to produce vacuum on paper and board machines?Liquid-ring vacuum pumps, centrifugal blowers, and steam ejectors
How do bleed valves work in vacuum systems?Bleed valves work by letting in air to reduce the vacuum level (or increase the pressure). They are opened to lower vacuum levels and closed to increase vacuum levels.
Below is a transcript of the video sample provided for this module:
Fourdrinier Design and Operation
View Course
Paper Machine Adjustable Drives
Paper Machine Hydraulic Systems
Paper Machine Lubrication Systems
Paper Machine Seal Water Systems
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