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Language: English French Polish 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: 32 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish
Paper machine forming fabrics are designed to retain as much fiber and other furnish components as possible while allowing water to drain through them as quickly as possible. These fabrics are typically produced from monofilament strands or yarns that are woven together in a pattern that can be classified by their fabric style (or weave); mesh, count, and diameter; surface topography; and air permeability. This module discusses how each of these characteristics affect final sheet quality.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What are the two main jobs of a forming fabric?To retain as much fiber and other furnish components as possible, and to allow water to drain through as quickly as possible.
What are the most common fabric styles or weaves used in forming fabrics?The most common fabric styles are single layer (one MD and one CD strand), double layer (one MD and two CD strands), double layer with support shute (one MD and three CD strands), and triple layer (two MD and three CD strands).
What is the difference between "mesh" and "count"?Mesh refers to the number of MD yarns per inch of fabric, while count refers to the number of CD yarns per inch of fabric.
Why can't air permeability (which measures air flow) be used alone to predict the drainage capacity of a fabric?Because it does not take into account the impact of the fibers and furnish on drainage. Surface topography and fabric construction both affect furnish retention and so can also affect the dewatering capacity of the fabric.
How can you tell if a forming fabric is misaligned?Most forming fabrics are manufactured with a colored stripe across their width. If this stripe is not straight, this means that the fabric is skewed or misaligned.
Below is a transcript of the video sample provided for this module:
Fourdrinier Design and Operation
View Course
Hydraulic Headboxes - Multi-Layer Headboxes
Hydraulic Headboxes - Stock Jet Geometry for Roll Type Gap Formers
Wet Pressing Theory
Tissue Machine Specific Hazards
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