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Language: English French Polish Portuguese Russian
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Wet Pressing Series (Details)Includes 7 courses for $299/year. Paper Library (Details)Includes 92 courses for $1,499/year.
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Training Time: 15 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
Roll presses are often used on paper and board machines to mechanically remove water from the sheet. They also consolidate and flatten the sheet, increase wet sheet strength, and improve final sheet strength characteristics. This module will give you a better understanding of roll presses and how they function in press sections of paper machines.
At the end of this module, you will be able to:
The following key questions are answered in this module:
Why is the sheet frequently separated from one or both felts soon after a press nip?To minimize "rewetting," wherein the sheet reabsorbs some water from the felt or felts
Are press rolls usually solid rolls?In a conventional roll press, the roll surfaces can be solid, blind-drilled, grooved, or blind-drilled and grooved.
What are the limitations of fixed crown rolls?A "fixed crown" roll has a crown ground into the roll face, and it is only appropriate for a single nip loading. On machines where nip loadings vary because different grades are made, a variable crown roll may be a better choice.
Are controlled-crown rolls used in top or bottom roll positions?Controlled-crown rolls can be used in both top and bottom roll press positions. In bottom positions, they typically have softer covers that are grooved or blind-drilled to enhance water removal.
How do controlled-crown rolls create the crown?CC rolls use hydraulic pressure in a sealed chamber or applied to cross-machine cylinders to create the crown.
Below is a transcript of the video sample provided for this module:
Felt Cleaning and Conditioning
View Course
Felt Tensioning and Guiding
Shoe Presses
Size Presses
Wet Pressing Theory
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