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Language: English French Portuguese Russian
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Training Time: 23 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Russian
Web guiding and spreading are two elements of web control that are used in web-producing processes. On paper and board machines, several fabric loops require web control to keep them running correctly on the machine. Web control is also used on the sheet after it has been dried to ensure the success of dry end and winder operations. This module will discuss web guiding first, and then web spreading.
At the end of this module, you will be able to:
The following key questions are answered in this module:
Which web or webs are guided and spread on a paper or board machine?On paper and board machines, fabric loops require web guiding and spreading to keep them running correctly, and the sheet requires guiding and spreading at the dry end and winder to ensure the success of dry end and winder operations.
I've heard that guide rolls must be ""in traction"" with the sheet in order to properly guide the sheet. What does that mean?"In traction" means that the sheet and guide roll surfaces are in contact and moving at approximately the same speed.
What is the ""law of normal entry"" for webs?This law states that a web will seek entry to a roll at 90 degrees to the roll's axis at each point of contact. This is how a spreader roll's bow causes the web to be directed outward, toward the roll ends, when it is set up with its bow pointing downstream.
How should bowed spreader rolls be oriented?Pointing the bow in the downstream direction utilizes the law of normal entry and spreads the web outward, but bowed rolls are sometimes rotated into or out of the web to compensate for a baggy center or slack edges.
Where are dual spreading devices used?Dual spreading devices are sometimes used after slitters to separate the slits and then straighten their paths.
Below is a transcript of the video sample provided for this module:
Felt Cleaning and Conditioning
View Course
Felt Tensioning and Guiding
Forming Fabric Tensioning and Guiding
Paper Coating Ingredients
Wet End Showers
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