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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
Shoe presses are used in the production of many different grades of paper and board. They differ from conventional roll presses in that they offer a significantly longer nip width and dwell time. Shoe presses offer many different benefits, including higher dryness to the dryer section, improved bonding and sheet strength properties, and increased bulk. Understanding the design and operation of shoe presses will help with day-to-day operations and troubleshooting.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What is the main advantage of a shoe press over roll press?With the increased nip width, the dwell time (the amount of time that the sheet is exposed to the nip pressure) is up to 10 times longer
On which grades are shoe presses used?Shoe presses were initially used on machines producing heavier weight grades, like board and corrugating medium. They are now used effectively in making printing, writing, and tissue, as well as container board and carton board, grades.
What are shoe press sleeves made out of?Most shoe press sleeves are made from a woven substrate with a coating of polyurethane, which may be grooved, blind drilled, or smooth.
What are the functions of the hydraulic fluid in a typical shoe press?The hydraulic fluid is used to pressurize the shoe loading pistons, provide lubrication for the shoe-to-sleeve interface, and provide cooling.
Does the entire shoe press rotate during press operation?No. The roll journals, heads, and sleeve rotate around the stationary support beam and press shoe assembly.
Below is a transcript of the video sample provided for this module:
Felt Cleaning and Conditioning
View Course
Roll Presses
Size Presses
Wet End Showers
Wet Pressing Theory
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