Felt Cleaning and Conditioning

SKU: C-643Duration: 11 Minutes

Pay-per-view (PPV) format perfect for individual users.

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Wet Pressing Series (Details)
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Course Details


Training Time: 11 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, French, Russian

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.

Learning Objectives

  • Describe the function of a press felt
  • Explain the importance of proper felt cleaning and conditioning
  • Identify and describe the equipment used for wet felt cleaning and conditioning
  • Describe the function/ purpose of the wet felt cleaning and conditioning equipment
  • Describe the best practice locations for wet felt uhle boxes and showers
  • Describe the different shower types

Key Questions

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

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Press felts do not typically wear out. Instead, they are usually replaced because they have either filled with contaminants or have compacted to the point that they're dewatering capacity is insufficient. It is the job of the Felt Cleaning and Conditioning System to maintain the felts void volume and caliper or thickness. This allows the felt to absorb and to then release water uniformly during press operation.
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