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Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.
Language: English French Portuguese
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Forming Series (Details)Includes 8 courses for $299/year. Paper Library (Details)Includes 92 courses for $1,499/year.
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Training Time: 24 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French
The forming section can contain one or more fabric loops, and each loop has its own set of support rolls and cleaning showers. The purpose of a forming fabric is to dewater and support the sheet as it forms, and carry the formed sheet to the next section of the paper machine. The purpose of the tensioning and guiding systems is to keep the fabric running at the proper tension and centered on the machine. This module will discuss the purpose and operation of forming fabric tensioning and guiding systems.
At the end of this module, you will be able to:
The following key questions are answered in this module:
In addition to furnish retention and dewatering capacity, what else is required of a forming fabric?The forming fabric must be able to withstand the wear caused by stationary elements and vacuum devices on the former.
Relatively high fabric tension is desirable because it improves drainage and reduces slippage on driven rolls. However, what happens if the tension is too high?Excessive fabric tension can reduce drainage capacity by narrowing the openings in the fabric, damage the wire seam, or cause roll deflections and warping, which can lead to ridges in the fabric.
What is the problem with low fabric tension?Very low fabric tension can cause slippage at the driven forming section rolls, and wire flexing at the gravity foils and vacuum boxes. This can lead to wire abrasion, and guiding and speed control issues.
What is the purpose of seam straightening?A skewed seam or colored stripe on the forming fabric indicates a misalignment in the forming section. Straightening the seam evens out the fabric tension, which evens out the dewatering capacity of the fabric across the machine.
What is the basic principle of fabric guiding?The fabric will move or ""steer"" toward the end of the roll that it contacts first.
Below is a transcript of the video sample provided for this module:
Felt Cleaning and Conditioning
View Course
Forming Fabric Design
Fourdrinier Design and Operation
Sheet Formation
Wet End Edge Trimming
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