Paper Machine Vacuum Systems

SKU: C-742Duration: 23 Minutes Certificate Included

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Course Details

Specs

Training Time: 23 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

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:

  • Describe the main functions of vacuum systems on paper and board machines
  • Identify and describe the safety hazards and safety guidelines associated with vacuum systems
  • Describe the equipment that can be used to produce vacuum
  • Describe the vacuum devices used on paper and board machines
  • Explain why vacuum pump seal water must be cool
  • Describe how vacuum levels are controlled in paper and board machine vacuum systems

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:

Vacuum systems perform three main functions on paper and board machines. In the forming section, vacuum is used to help de-water the stock as the sheet forms. In the press section, vacuum is used to de-water and clean the press felts, which in turn remove water from the sheet. And, at several locations, vacuum is used to help transfer the sheet between sections. In addition to these functions, the vacuum system also helps recover water for reuse in the paper or board making process.

Use the additional resources and links below to learn more about this topic:

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