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Language: English
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Training Time: 18 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English
Felt cleaning and conditioning systems use mechanical and chemical means to keep press felts clean and open during press operation. Showers and uhle boxes are positioned in the felt runs to remove contaminants from and dewater the felts. This helps maintain the dewatering capacity of the felts, and improves the overall cleanliness and runnability of the press section. This module will discuss the cleaning and conditioning equipment used on a paper or board machine.
At the end of this module, you will be able to:
The following key questions are answered in this module:
Why are press felts usually replaced?Press felts are usually replaced because they have either filled with contaminants or have compacted to the point that their dewatering capacity is insufficient
How many showers and uhle boxes are typically used on each press felt?A typical system utilizes 3 or 4 showers on each wet felt, followed by one or two uhle boxes
Where are the lubricating showers installed in press felt runs?A lube shower is usually installed ahead of each uhle box to help reduce wear on the felt and box cover, and also act as a seal at the uhle box. They should spray into the ingoing nip.
Why are high pressure needle jet showers on press felts oscillated from front to back?They are oscillated in the cross-machine direction to evenly distribute the water and prevent damage to the felts; these showers should be interlocked to shut off if the oscillator or press section stops
Where are uhle boxes typically positioned?Uhle boxes are usually located on the face- or sheet-side of the felt after the press nip and all major showers
Below is a transcript of the video sample provided for this module:
Felt Tensioning and Guiding
View Course
Forming Fabric Design
Forming Fabric Tensioning and Guiding
Roll Handling and Wrapping
Roll Presses
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