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Based on: Industry Standards and Best Practices

Languages: English

Sample Transcript

The slitter section of a winder typically includes multiple sheet guiding and support rolls, the slitters themselves, the spreader rolls before and after the slitters. The slitters cut the sheet into the desired roll widths, and also trim off the front and back edges. Depending on the grade, the number of slitters can vary from three or four up to 20 or more. Slitting is typically accomplished by multiple pairs of rotating knives mounted on shafts or rails. The cuts or slits are made at the points where the top and bottom slitter knives make contact. On paper and board machine winders, the top slitters are typically circular blades and the bottom slitters are usually bands.

Paper Machine Winder Slitting

Training Time: 26 minutes

The purpose of a winder is to convert the large diameter, machine-width parent reels of paper or board produced on a paper or board machine into finished roll sets ready for converting or shipping. Winder slitters are used to cut parent reels into various roll widths and trim off the edges of the sheet in order to meet customer requirements. This module will describe common slitting methods and recognize safety guidelines applicable to winder slitters and slitter sections.

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Bottom slitter bands are usually driven, and top slitter knives are loaded against and driven by the bands

Bottom slitter bands are usually driven, and top slitter knives are loaded against and driven by the bands

A typical slitter blade has a 25 to 30 degree primary grind angle, and a 15 degree secondary grind angle

A typical slitter blade has a 25 to 30 degree primary grind angle, and a 15 degree secondary grind angle

Side loading of the top slitter is required to drive the top slitter knife

Side loading of the top slitter is required to drive the top slitter knife

Learning Objectives

  • Explain the purpose of the winder slitting process
  • Identify and describe hazards and safety guidelines applicable to winder slitters and slitter sections
  • Describe common slitting methods and identify the method most often used during winder slitting
  • Describe the advantage of individually driven bottom slitters over a driven bottom slitter carrier roll
  • Describe slitter setup parameters
  • Describe automatic slitter positioning systems
  • Describe slitter variables which influence slit quality
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Paper Machine Winder Slitting FAQs

Why are bottom slitters driven slightly faster than the sheet?
The overspeed prevents buckling and bunching up of the sheet at the entrance to the slitters.

There are several different slitting methods - water jet, razor, score/crush, and shear. Which is the most common?
Shear slitting is the most common method used on paper and board machine winders because it gives high quality cuts on a wide range of grades at relatively high speeds.

Why is each bottom slitter driven instead of mounting all of the bottom slitters on a driven carrier roll?
Because the carrier roll diameter must increase as the winder speed and machine width increase, in order to control vibrations, individual motor slitters have become more popular.

They are often referred to as ""knives,"" but only the top slitters look sharp. How do most slitters cut the sheet?
On most winders, the top slitters are sharp circular blades and the bottom slitters are bands. The top blade slightly overlaps the bottom band and is loaded from the side to cut the sheet using a shearing action, like scissors.

When roll sizes change, how are the slitters repositioned?
Slitters can be repositioned manually or automatically. Manual positioning exposes workers to hazards and takes longer, so is more appropriate when slit widths don't change very often.

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