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Based on: Industry Standards and Best Practices

Languages: English

Sample Transcript

A typical modern shoe press has the following major components: one, a stationary press beam, two, hydraulically loaded press shoe, three, sleeve or belt, four, roll heads and journals, and five, hydraulic system. The stationary press beam is a cross-machine structure on which the hydraulic loading pistons and press shoe are mounted. It must be designed to support the static loads as well as the offsetting hydraulic forces in the nip.

Shoe Presses

Training Time: 15 minutes

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.

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Training Content + Interactive Quizzes

In a shoe press nip, the sheet is exposed to the nip pressure up to 10 times longer than with a conventional roll press nip

The hydraulic pistons used to load the shoe are mounted on the stationary press beam

The roll heads and journals support the shoe press and rotate freely on spherical roller bearings

Learning Objectives

  • Describe the major difference between a shoe press and a conventional roll press
  • List the benefits of shoe presses
  • List the major components of a shoe press, including the stationary press beam, hydraulically-loaded shoe, sleeve or belt, roll heads and journals, and dedicated hydraulic system
  • Identify the functions of the major components
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Shoe Presses FAQs

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.

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