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Language: English French Polish Russian Spanish
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Wet Pressing Series (Details)Includes 7 courses for $299/year. Paper Library (Details)Includes 95 courses for $1,499/year.
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Training Time: 11 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, French, Polish, Russian, Spanish
This module begins with a description of the objectives of the wet pressing process on a paper machine. Then, it discusses how water is removed from the sheet in press roll nips. It explains the purpose of a wet felt in wet pressing and how wet felts are designed. This module will give you a better understanding of how water is removed from the sheet during the wet pressing process.
Calendering - Hard Nip
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The following key questions are answered in this module:
What are the objectives of wet pressing?Wet pressing removes water from the sheet, consolidates the sheet, and improves the wet strength of the web so it can remain intact in open draws.
How does wet pressing affect sheet properties?Pressing increases density, surface smoothness, and dry and wet strength properties. Bulk, caliper, and stiffness typically decrease.
What are the phases of water removal in presses?Water removal can be divided into compression and expansion phases.
What is the purpose of the wet felt?Wet felts act as a transfer device or belt to move the wet sheet without damage, absorb water from sheet, and maintain an even, smooth surface for the wet sheet.
What types of rolls are used for pressing?Wet pressing can be accomplished by using solid rolls, variable crown rolls, suction rolls, and shoe presses.
Below is a transcript of the video sample provided for this module:
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